Επιστημονικά Περιοδικά

Δημοσιεύσεις σε Διεθνή Επιστημονικά Περιοδικά 

2026

Ioannidis, D.; Rigopoulos, P.; Braimakis, K.; Pallis, P.; Karellas, S. Multi-objective ANN-driven genetic algorithm optimization of energy efficiency measures in an NZEB multi-family house building in Greece.
Energy and Buildings 2026, 351, 116653. https://doi.org/10.1016/j.enbuild.2025.116653

Polychronakis, K.; Korres, D.; Sammoutos, C.; Vidalis, E.; Tzivanidis, C. Frequency domain model of wave-induced mismatch in a moored floating solar platform with thermal effects. Solar Energy 2026, 304, 114180. https://doi.org/10.1016/j.solener.2025.114180

Lykas, P.; Bellos, E.; Tzivanidis, C. Dynamic investigation of a multiple energy production and storage system for a residential building. Renewable Energy 2026, 256, 123938. https://doi.org/10.1016/j.renene.2025.123938

Lykas, P.; Bellos, E.; Tzivanidis, C. Comprehensive review and performance assessment of Carnot battery storage systems with multiple energy outputs. Energy Conversion and Management 2026, 348, 120702.
https://doi.org/10.1016/j.enconman.2025.120702

Bellos, E.; Lykas, P.; Sammoutos, C.; Kitsopoulou, A.; Gonidaki, D.; Vidalis, E.; Rahbari, H.R.; Arabkoohsar, A.; Tzivanidis, C. Transient investigation of solar-powered absorption heat transformers for process heat production in industries. Renewable Energy 2026, 256, 124316. https://doi.org/10.1016/j.renene.2025.124316

Avgerinou, H.; Braimakis, K.; Roumpedakis, T.C.; Karellas, S. Thermodynamic modeling and techno-economic assessment of hydrogen-fuelled diabatic compressed air energy storage configurations. Applied Thermal Engineering 2025, 278, 127325.
https://doi.org/10.1016/j.applthermaleng.2025.127325

Braimakis, K.; Westermeier, M.; Schifflechner, C.; Beaughon, M.; Serafino, A.; Charalampidis, A.; et al.
A general framework for part-load optimization of air-cooled ORCs with screw expanders. Energy 2025, 332, 137061. https://doi.org/10.1016/j.energy.2025.137061

Braimakis, K. Comparative techno-economic assessment of solar district heating architectures based on combined solar thermal collectors, heat pumps, PVs and batteries. Applied Thermal Engineering 2025, 281, 128723. https://doi.org/10.1016/j.applthermaleng.2025.128723

Kitsopoulou, A.; Bellos, E.; Mitsopoulos, G.; Tzivanidis, C. A benchmark comparative thermodynamic analysis of transcritical CO₂ heat pump configurations for heating purposes. Thermal Science and Engineering Progress 2025, 68, 104200. https://doi.org/10.1016/j.tsep.2025.104200

Vidalis, E.; Bellos, E.; Sammoutos, C.; Kitsopoulou, A.; Lykas, P.; Korres, D.N.; Gonidaki, D.; Tzivanidis, C. Design and performance investigation of a solar photovoltaic installation on a university building.
Green Energy and Sustainability 2025, 1, 0010. https://doi.org/10.47248/ges2505040010

Lykas, P.; Tsimpoukis, A.; Bellos, E.; Tsagkalidis, N.; Nikolopoulos, N.; Tzivanidis, C. Evaluation of different thermal storage scenarios in an industrial polygeneration unit driven by waste heat and solar thermal collectors. Applied Thermal Engineering 2025, 279, 127606. https://doi.org/10.1016/j.applthermaleng.2025.127606

Vagiakis, A.; Korres, D.N.; Tzivanidis, C. Simulation of natural convection heat transfer in dielectric liquids for single-phase immersion cooling rack servers. Applied Thermal Engineering 2025, 274, 126595.
https://doi.org/10.1016/j.applthermaleng.2025.126595

Syngounas, E.; Tsimpoukis, D.; Bellos, E.; Koukou, M.K.; Tzivanidis, C.; Vrachopoulos, M.Gr.
Energy and exergy performance investigation of a transcritical CO₂ vapor ejector-based refrigeration system for marine provision plants. Applied Thermal Engineering 2025, 269, 126036. https://doi.org/10.1016/j.applthermaleng.2025.126036

Rahbari, H.R.; Elmegaard, B.; Bellos, E.; Tzivanidis, C.; Arabkoohsar, A. Thermochemical technologies for industrial waste heat recovery: A comprehensive review. Renewable and Sustainable Energy Reviews 2025, 215, 115598. https://doi.org/10.1016/j.rser.2025.115598

Sammoutos, C.; Kitsopoulou, A.; Lykas, P.; Gonidaki, D.; Vidalis, E.; Korres, D.; Rahbari, H.R.; Tzivanidis, C.; Bellos, E. Dynamic investigation of thermochemical heat upgrade and alternative industrial heating technologies. Energies 2025, 18, 1990. https://doi.org/10.3390/en18081990

Braimakis, K.; Kitsopoulou, A.; Roumpedakis, T.C.; Stavrakakis, G.M.; Tzivanidis, C. Part-load-based optimization of solar ejector cooling cycle. Renewable Energy 2025, 243, 122582. https://doi.org/10.1016/j.renene.2025.122582

Said, Z.; Bellos, E.; Muhammad Ali, H.; Rahman, S.; Tzivanidis, C. Nanofluids, turbulators, and novel working fluids for heat transfer processes and energy applications: Current status and prospects. Applied Thermal Engineering 2025, 258, 124478. https://doi.org/10.1016/j.applthermaleng.2024.124478

Stavrakakis, G.M.; Bakirtzis, D.; Drakaki, K.-K.; Yfanti, S.; Katsaprakakis, D.A.; Braimakis, K.; et al.
Application of the typology approach for energy renovation planning of public building stocks at the local level: A case study in Greece. Energies 2024, 17, 30689. https://doi.org/10.3390/en17030689

Braimakis, K. Mapping the waste heat recovery potential of CO₂ intercooling compression via organic Rankine cycle. International Journal of Refrigeration 2024, 159, 309–322. https://doi.org/10.1016/j.ijrefrig.2024.01.008

Braimakis, K.; Karellas, S. Thermodynamic investigation of integrated organic Rankine cycle–ejector vapor compression cooling cycle waste heat recovery configurations for cooling, heating and power production.
Energy 2024, 305, 132020. https://doi.org/10.1016/j.energy.2024.132020

Fisher, R.; Ciappi, L.; Niknam, P.; Braimakis, K.; Karellas, S.; Frazzica, A.; et al. Innovative waste heat valorisation technologies for zero-carbon ships: A review. Applied Thermal Engineering 2024, 253, 123740.
https://doi.org/10.1016/j.applthermaleng.2024.123740

Han, X.; Dai, Y.; Guo, X.; Braimakis, K.; Karellas, S.; Yan, J. A novel dual-stage intercooled and recuperative gas turbine system integrated with transcritical organic Rankine cycle: System modeling, energy and exergy analyses. Energy 2024, 305, 132252. https://doi.org/10.1016/j.energy.2024.132252

Korres, D.N.; Papingiotis, T.; Koronaki, I.P.; Tzivanidis, C. Experimental analysis and optimization of a concentrated thermo-photovoltaic collector with bifacial receiver. Renewable Energy 2024, 236, 121401.
https://doi.org/10.1016/j.renene.2024.121401

Sammoutos, C.; Bellos, E.; Kitsopoulou, A.; Lykas, P.; Vidalis, E.; Tzivanidis, C. Optical, thermal and exergy analysis of a beam-down linear Fresnel reflector coupled with a flat plate receiver. Solar Energy 2024, 282, 112949. https://doi.org/10.1016/j.solener.2024.112949

Kitsopoulou, A.; Bellos, E.; Tzivanidis, C. An up-to-date review of passive building envelope technologies for sustainable design. Energies 2024, 17, 4039. https://doi.org/10.3390/en17164039

Tsimpoukis, D.; Syngounas, E.; Bellos, E.; Koukou, M.; Tzivanidis, C.; Anagnostatos, S.; Vrachopoulos, G.
Data-driven energy efficiency comparison between operating R744 and R448A supermarket refrigeration systems based on hybrid experimental–simulation analysis. Thermal Science and Engineering Progress 2024, 53, 102776. https://doi.org/10.1016/j.tsep.2024.102776

Kitsopoulou, A.; Pallantzas, D.; Bellos, E.; Tzivanidis, C. Mapping the potential of zero-energy building in Greece using roof photovoltaics. Designs 2024, 8, 68. https://doi.org/10.3390/designs8040068

Kitsopoulou, A.; Pallantzas, D.; Sammoutos, C.; Lykas, P.; Bellos, E.; Vrachopoulos, M.Gr.; Tzivanidis, C.
A comparative investigation of building rooftop retrofit actions using an energy and computational fluid dynamics approach. Energy and Buildings 2024, 315, 114326. https://doi.org/10.1016/j.enbuild.2024.114326

Kitsopoulou, A.; Ziozas, N.; Iliadis, P.; Bellos, E.; Tzivanidis, C.; Nikolopoulos, N. Energy performance analysis of alternative building retrofit interventions for the four climatic zones of Greece. Journal of Building Engineering 2024, 87, 109015. https://doi.org/10.1016/j.jobe.2024.109015

Lykas, P.; Bellos, E.; Kitsopoulou, A.; Sammoutos, C.; Tzivanidis, C. Electricity and hydrogen cogeneration: A case study simulation via the Aspen Plus tool. Energy 2024, 294, 130903.
https://doi.org/10.1016/j.energy.2024.130903

Kitsopoulou, A.; Bellos, E.; Sammoutos, C.; Lykas, P.; Vrachopoulos, M.G.; Tzivanidis, C. A detailed investigation of thermochromic dye-based roof coatings for Greek climatic conditions. Journal of Building Engineering 2024, 84, 108570. https://doi.org/10.1016/j.jobe.2024.108570

Bellos, E.; Arabkoohsar, A.; Lykas, P.; Sammoutos, C.; Kitsopoulou, A.; Tzivanidis, C. Investigation of a solar-driven absorption heat transformer with various collector types for industrial process heating. Applied Thermal Engineering 2024, 244, 122665. https://doi.org/10.1016/j.applthermaleng.2024.122665

Lykas, P.; Bellos, E.; Kitsopoulou, A.; Tzivanidis, C. Dynamic analysis of a solar–biomass-driven multigeneration system based on an s-CO₂ Brayton cycle. International Journal of Hydrogen Energy 2024, 59, 1268–1286. https://doi.org/10.1016/j.ijhydene.2024.02.093

Korres, D.N.; Bellos, E.; Tzivanidis, C. An innovative asymmetrical CPC with integrated PCM as an in-line water heater. Solar Energy 2024, 269, 112342. https://doi.org/10.1016/j.solener.2024.112342

Papingiotis, T.; Korres, D.N.; Koronaki, I.; Tzivanidis, C. Utilization of H₂O/CuO and Syltherm 800/CuO nanofluids in a concentrating solar collector with photovoltaic elements. Energies 2024, 17, 576.
https://doi.org/10.3390/en17030576

Pavlovic, S.; Bellos, E.; Grozdanovic, M.; Stefanovic, V.; Vukic, M.; Ilic, M.; Tzivanidis, C. Daily thermodynamic analysis of a solar dish-driven reheating organic Rankine cycle. Thermal Science 2024, 28, 3209–3218. https://doi.org/10.2298/TSCI230902055P

Braimakis, K.; Karellas, S. Exergy efficiency potential of dual-phase expansion trilateral and partial evaporation ORC with zeotropic mixtures. Energy 2023, 262, 125475. https://doi.org/10.1016/j.energy.2022.125475

Wieland, C.; Schifflechner, C.; Braimakis, K.; Kaufmann, F.; Dawo, F.; Karellas, S.; et al. Innovations for organic Rankine cycle power systems: Current trends and future perspectives. Applied Thermal Engineering 2023, 225, 120201. https://doi.org/10.1016/j.applthermaleng.2023.120201

Stavrakakis, G.M.; Katsaprakakis, D.A.; Braimakis, K. A computational fluid dynamics modelling approach for the numerical verification of the bioclimatic design of a public urban area in Greece.
Sustainability 2023, 15, 11642. https://doi.org/10.3390/su151511642

Bellos, E.; Lykas, P.; Tzivanidis, C. Thermodynamic investigation of a novel organic Rankine cycle including partial evaporation, dual-phase expander, flash tank, dry expander and recuperator for waste heat recovery. Thermal Science and Engineering Progress 2023, 46, 102244. https://doi.org/10.1016/j.tsep.2023.102244

Kitsopoulou, A.; Bellos, E.; Lykas, P.; Sammoutos, C.; Vrachopoulos, M.Gr.; Tzivanidis, C. A systematic analysis of phase change material and optically advanced roof coatings integration for Athenian climatic conditions. Energies 2023, 16, 7521. https://doi.org/10.3390/en16227521

Bellos, E.; Tzivanidis, C. A detailed investigation of an evacuated flat plate solar collector. Applied Thermal Engineering 2023, 234, 121334. https://doi.org/10.1016/j.applthermaleng.2023.121334

Korres, D.N.; Koronaki, I.P.; Tzivanidis, C. Thermal efficiency enhancement of an evacuated tube collector: Experimental, numerical and analytical approach. Thermal Science and Engineering Progress 2023, 45, 102152. https://doi.org/10.1016/j.tsep.2023.102152

Papingiotis, T.; Korres, D.N.; Koronaki, I.; Tzivanidis, C. Energetical and exergetical analyses of a concentrating PV/T collector: A numerical approach. Applied Sciences 2023, 13, 10669. https://doi.org/10.3390/app131910669

Tsimpoukis, D.; Syngounas, E.; Bellos, E.; Koukou, M.; Tzivanidis, C.; Anagnostatos, S.; Vrachopoulos, M.G. Optimization analysis of organic Rankine cycle powered by waste heat of a supermarket transcritical CO₂ multi-ejector refrigeration cycle. Journal of Cleaner Production 2023, 418, 138106. https://doi.org/10.1016/j.jclepro.2023.138106

Bellos, E.; Lykas, P.; Sammoutos, C.; Kitsopoulou, A.; Korres, D.; Tzivanidis, C. Thermodynamic investigation of a solar-driven organic Rankine cycle with partial evaporation. Energy Nexus 2023, 11, 100229. https://doi.org/10.1016/j.nexus.2023.100229

Sammoutos, C.; Kitsopoulou, A.; Lykas, P.; Bellos, E.; Tzivanidis, C. Dynamic investigation of a solar-driven Brayton cycle with supercritical CO₂. Applied Sciences 2023, 13, 71. https://doi.org/10.3390/asi6040071

Korres, D.N.; Tzivanidis, C. A flat plate collector with a multi-cavity receiver as an innovative alternative in contrast to the classical design: A comparative study with experimental validation. Thermal Science and Engineering Progress 2023, 42, 101874. https://doi.org/10.1016/j.tsep.2023.101874

Korres, D.N.; Papingiotis, T.; Koronaki, I.; Tzivanidis, C. Thermal and optical analyses of a hybrid solar photovoltaic/thermal (PV/T) collector with asymmetric reflector: Numerical modeling and validation with experimental results. Sustainability 2023, 15, 9932. https://doi.org/10.3390/su15139932

Kitsopoulou, A.; Bellos, E.; Lykas, P.; Vrachopoulos, M.Gr.; Tzivanidis, C. Multi-objective evaluation of different retrofitting scenarios for a typical Greek building. Sustainable Energy Technologies and Assessments 2023, 57, 103156. https://doi.org/10.1016/j.seta.2023.103156

Tsimpoukis, D.; Syngounas, E.; Bellos, E.; Koukou, M.; Tzivanidis, C.; Anagnostatos, S.; Vrachopoulos, G. Thermodynamic and economic analysis of a supermarket transcritical CO₂ refrigeration system coupled with  olar-fed supercritical CO₂ Brayton and organic Rankine cycles. Energy Conversion and Management: X 2023, 18, 100351. https://doi.org/10.1016/j.ecmx.2023.100351

Bellos, E.; Lykas, P.; Tsimpoukis, D.; Korres, D.N.; Kitsopoulou, A.; Vrachopoulos, M.Gr.; Tzivanidis, C.
Multicriteria analysis of a solar-assisted space heating unit with a high-temperature heat pump for Greek climate conditions. Applied Sciences 2023, 13, 4066. https://doi.org/10.3390/app13064066

Bellos, E.; Lykas, P.; Tzivanidis, C. Performance analysis of a zero-energy building using photovoltaics and hydrogen storage. Applied Sciences 2023, 13, 43. https://doi.org/10.3390/asi6020043

Bellos, E.; Korres, D.N.; Tzivanidis, C. Investigation of a compound parabolic collector with a flat glazing.
Sustainability 2023, 15, 4347. https://doi.org/10.3390/su15054347

Bellos, E.; Tsimpoukis, D.; Lykas, P.; Kitsopoulou, A.; Korres, D.N.; Vrachopoulos, M.Gr.; Tzivanidis, C.
Investigation of a high-temperature heat pump for heating purposes. Applied Sciences 2023, 13, 2072.
https://doi.org/10.3390/app13042072

Lykas, P.; Georgousis, N.; Bellos, E.; Tzivanidis, C. A comprehensive review of solar-driven multigeneration systems with hydrogen production. International Journal of Hydrogen Energy 2023, 48, 437–477. https://doi.org/10.1016/j.ijhydene.2022.09.226

Lykas, P.; Bellos, E.; Korres, D.N.; Kitsopoulou, A.; Tzivanidis, C. Energy, exergy, economic, and environmental (4E) analysis of a pumped thermal energy storage system for trigeneration in buildings.
Energy Advances 2023, 2, 430–440. https://doi.org/10.1039/D2YA00360K

Kontou, V.; Grimekis, D.; Braimakis, K.; Karellas, S. Techno-economic assessment of dimethyl carbonate production based on carbon capture and utilization and power-to-fuel technology. Renewable and Sustainable Energy Reviews 2022, 157, 112006. https://doi.org/10.1016/j.rser.2021.112006

Lykas, P.; Georgousis, N.; Kitsopoulou, A.; Korres, D.N.; Bellos, E.; Tzivanidis, C. A detailed parametric analysis of a solar-powered cogeneration system for electricity and hydrogen production. Applied Sciences 2022, 12, 433. https://doi.org/10.3390/app13010433

Korres, D.N.; Bellos, E.; Lykas, P.; Tzivanidis, C. An innovative parabolic trough collector design with a twin-cavity receiver. Applied Sciences 2022, 12, 12551. https://doi.org/10.3390/app122412551

Korres, D.N.; Bellos, E.; Tzivanidis, C. Integration of a linear cavity receiver in an asymmetric compound parabolic collector. Energies 2022, 15, 8635. https://doi.org/10.3390/en15228635

Lykas, P.; Bellos, E.; Caralis, G.; Tzivanidis, C. Dynamic investigation and optimization of a solar-based unit for power and green hydrogen production: A case study of the Greek island of Kythnos. Applied Sciences 2022, 12, 11134. https://doi.org/10.3390/app122111134

Korres, D.N.; Tzivanidis, C. A novel asymmetric compound parabolic collector under experimental and numerical investigation. Renewable Energy 2022, 199, 1580–1592. https://doi.org/10.1016/j.renene.2022.08.030

Bellos, E.; Lykas, P.; Tzivanidis, C. Theoretical analysis of a biomass-driven single-effect absorption heat pump for heating and cooling purposes. Applied Sciences 2022, 12, 99. https://doi.org/10.3390/asi5050099

Korres, D.N.; Tzivanidis, C. An innovative small-sized double cavity parabolic trough collector under investigation and comparison with a conventional design. Sustainable Energy Technologies and assessments 2022, 53, 102462. https://doi.org/10.1016/j.seta.2022.102462

Bellos, E.; Said, Z.; Lykas, P.; Tzivanidis, C. A review of polygeneration systems with CO₂ working fluid.
Thermal Science and Engineering Progress 2022, 34, 101435. https://doi.org/10.1016/j.tsep.2022.101435

Bellos, E.; Lykas, P.; Tzivanidis, C. Heat and flow study of internally finned tubes with different fin geometries. Applied Sciences 2022, 12, 50. https://doi.org/10.3390/asi5030050

Lykas, P.; Georgousis, N.; Bellos, E.; Tzivanidis, C. Investigation and optimization of a CO₂-based polygeneration unit for supermarkets. Applied Energy 2022, 311, 118717. https://doi.org/10.1016/j.apenergy.2022.118717

Bellos, E.; Lykas, P.; Tzivanidis, C. Investigation of a solar-driven organic Rankine cycle with reheating.
Applied Sciences 2022, 12, 2322. https://doi.org/10.3390/app12052322

Bellos, E.; Lykas, P.; Tzivanidis, C. Pumped thermal energy storage system for trigeneration: The concept of power-to-XYZ. Applied Sciences 2022, 12, 970. https://doi.org/10.3390/app12030970

Georgousis, N.; Lykas, P.; Bellos, E.; Tzivanidis, C. Multi-objective optimization of a solar-driven polygeneration system based on CO₂ working fluid. Energy Conversion and Management 2022, 252, 115136. https://doi.org/10.1016/j.enconman.2021.115136

Braimakis, K. Solar ejector cooling systems: A review. Renewable Energy 2021, 164, 566–602. https://doi.org/10.1016/j.renene.2020.09.079

Georgousopoulos, S.; Braimakis, K.; Grimekis, D.; Karellas, S. Thermodynamic and techno-economic assessment of pure and zeotropic fluid ORCs for waste heat recovery in a biomass IGCC plant. Applied Thermal Engineering 2021, 183, 116202. https://doi.org/10.1016/j.applthermaleng.2020.116202

Braimakis, K.; Grispos, V.; Karellas, S. Exergetic efficiency potential of double-stage ORCs with zeotropic mixtures of natural hydrocarbons and CO₂. Energy 2021, 218, 119577. https://doi.org/10.1016/j.energy.2020.119577

Pallis, P.; Varvagiannis, E.; Braimakis, K.; Roumpedakis, T.; Leontaritis, A.D.; Karellas, S. Development, experimental testing and techno-economic assessment of a fully automated marine organic Rankine cycle prototype for jacket cooling water heat recovery. Energy 2021, 228, 120596. https://doi.org/10.1016/j.energy.2021.120596

Roumpedakis, T.C.; Fostieris, N.; Braimakis, K.; Monokrousou, E.; Charalampidis, A.; Karellas, S.
Techno-economic optimization of medium-temperature solar-driven subcritical organic Rankine cycle.
Thermo 2021, 1, 77–105. https://doi.org/10.3390/thermo1010007

Pallis, P.; Braimakis, K.; Roumpedakis, T.C.; Varvagiannis, E.; Karellas, S.; Doulos, L.; Katsaros, M.; Vourliotis, P. Energy and economic performance assessment of efficiency measures in zero-energy office buildings in Greece. Building and Environment 2021, 206, 108378. https://doi.org/10.1016/j.buildenv.2021.108378

Braimakis, K.; Charalampidis, A.; Karellas, S. Techno-economic assessment of a small-scale biomass ORC–CHP for district heating. Energy Conversion and Management 2021, 247, 114705. https://doi.org/10.1016/j.enconman.2021.114705

Tsimpoukis, D.; Syngounas, E.; Bellos, E.; Koukou, M.; Tzivanidis, C.; Anagnostatos, S.; Vrachopoulos, M.G. Investigation of energy and financial performance of a novel CO₂ supercritical solar–biomass trigeneration system for operation in the climate of Athens. Energy Conversion and Management 2021, 245, 114583. https://doi.org/10.1016/j.enconman.2021.114583

Bellos, E.; Tzivanidis, C. Investigation of a novel CO₂ transcritical organic Rankine cycle driven by parabolic trough solar collectors. Applied Sciences 2021, 11, 53. https://doi.org/10.3390/asi4030053

Bellos, E.; Tzivanidis, C. Parametric analysis of a solar-driven trigeneration system with an organic Rankine cycle and a vapor compression cycle. Energy and Built Environment 2021, 2, 278–289. https://doi.org/10.1016/j.enbenv.2020.08.004

Bellos, E.; Tzivanidis, C. Parametric investigation of a ground source CO₂ heat pump for space heating.
Energies 2021, 14, 3563. https://doi.org/10.3390/en14123563

Bellos, E.; Tzivanidis, C.; Said, Z. Investigation and optimization of a solar-assisted pumped thermal energy storage system with flat plate collectors. Energy Conversion and Management 2021, 237, 114137.
https://doi.org/10.1016/j.enconman.2021.114137

Bellos, E.; Tzivanidis, C. Dynamic investigation and optimization of a solar-fed trigeneration system.
Applied Thermal Engineering 2021, 191, 116869. https://doi.org/10.1016/j.applthermaleng.2021.116869

Bellos, E.; Chatzovoulos, I.; Tzivanidis, C. Yearly investigation of a solar-driven absorption refrigeration system with ammonia–water absorption pair. Thermal Science and Engineering Progress 2021, 23, 100885.
https://doi.org/10.1016/j.tsep.2021.100885

Bellos, E.; Tzivanidis, C. Parametric analysis of a polygeneration system with CO₂ working fluid. Applied Sciences 2021, 11, 3215. https://doi.org/10.3390/app11073215

Tsimpoukis, D.; Syngounas, E.; Petsanas, D.; Mitsopoulos, G.; Anagnostatos, S.; Bellos, E.; Tzivanidis, C.; Vrachopoulos, M.G. Energy and environmental investigation of R744 all-in-one configurations for refrigeration and heating/air-conditioning needs of a supermarket. Journal of Cleaner Production 2021, 279, 123234. https://doi.org/10.1016/j.jclepro.2020.123234

Tsimpoukis, D.; Syngounas, E.; Petsanas, D.; Mitsopoulos, G.; Anagnostatos, S.; Bellos, E.; Tzivanidis, C.; Vrachopoulos, M.G. Energy and environmental investigation of R744 all-in-one configurations for refrigeration and heating/air-conditioning needs of a supermarket. Journal of Cleaner Production 2021, 279, 123234. https://doi.org/10.1016/j.jclepro.2020.123234

Braimakis, K.; Magiri-Skouloudi, D.; Grimekis, D.; Karellas, S. Energy–exergy analysis of ultra-supercritical biomass-fuelled steam power plants for industrial CHP, district heating and cooling. Renewable Energy 2020, 154, 252–269. https://doi.org/10.1016/j.renene.2020.02.091

Braimakis, K.; et al. Exergetic performance of CO₂ and ultra-low-GWP refrigerant mixtures as working fluids in ORC for waste heat recovery. Energy 2020, 201, 117801. https://doi.org/10.1016/j.energy.2020.117801

Roumpedakis, T.C.; Loumpardis, G.; Monokrousou, E.; Braimakis, K.; Charalampidis, A.; Karellas, S.
Exergetic and economic analysis of a solar-driven small-scale ORC. Renewable Energy 2020, 157, 1008–1024. https://doi.org/10.1016/j.renene.2020.05.016

Bellos, E.; Sarakatsanis, I.; Tzivanidis, C. Investigation of different storage systems for solar-driven organic Rankine cycle. Applied Sciences 2020, 10, 52. https://doi.org/10.3390/asi3040052

Bellos, E.; Tzivanidis, C. Solar concentrating systems and applications in Greece: A critical review.
Journal of Cleaner Production 2020, 272, 122855. https://doi.org/10.1016/j.jclepro.2020.122855

Bellos, E.; Tzivanidis, C. Polynomial expressions for the thermal efficiency of the parabolic trough solar collector. Applied Sciences 2020, 10, 6901. https://doi.org/10.3390/app10196901

Bellos, E.; Tzivanidis, C. Incorporation of an organic Rankine cycle in a transcritical booster CO₂ refrigeration system. International Journal of Energy Research 2020, 44, 7974–7988.
https://doi.org/10.1002/er.5192

Bellos, E.; Tzivanidis, C. Energy and financial analysis of a solar-driven thermoelectric generator.
Journal of Cleaner Production 2020, 264, 121534. https://doi.org/10.1016/j.jclepro.2020.121534

Bellos, E.; Tzivanidis, C. Concentrating solar collectors for a trigeneration system: A comparative study.
Applied Sciences 2020, 10, 4492. https://doi.org/10.3390/app10134492

Korres, D.N.; Tzivanidis, C. Investigation of a novel small-sized bifacial cavity PTC and comparison with conventional configurations. Thermal Science and Engineering Progress 2020, 17, 100355. https://doi.org/10.1016/j.tsep.2019.100355

Bellos, E.; Tzivanidis, C.; Said, Z. A systematic parametric thermal analysis of nanofluid-based parabolic trough solar collectors. Sustainable Energy Technologies and Assessments 2020, 39, 100714.
https://doi.org/10.1016/j.seta.2020.100714

Bellos, E.; Tzivanidis, C. Financial optimization of a solar-driven organic Rankine cycle.
Applied Sciences 2020, 10, 23. https://doi.org/10.3390/asi3020023

Tzivanidis, C.; Bellos, E. A comparative study of solar-driven trigeneration systems for the building sector.
Energies 2020, 13, 2074. https://doi.org/10.3390/en13082074

Bellos, E.; Tzivanidis, C. Parametric investigation of a trigeneration system with an organic Rankine cycle and absorption heat pump driven by parabolic trough collectors for the building sector. Energies 2020, 13, 1800. https://doi.org/10.3390/en13071800

Kasaeian, A.; Bellos, E.; Shamaeizadeh, A.; Tzivanidis, C. Solar-driven polygeneration systems: Recent progress and outlook. Applied Energy 2020, 264, 114764. https://doi.org/10.1016/j.apenergy.2020.114764

Bellos, E.; Tzivanidis, C. Enhancing the performance of a parabolic trough collector with combined thermal and optical techniques. Applied Thermal Engineering 2020, 164, 114496. https://doi.org/10.1016/j.applthermaleng.2019.114496

de Riese, T.; Hansen, L.; Magiri-Skouloudi, D.; Braimakis, K.; Clemens, L.; Bergins, C.; Fendt, S.; Karellas, S.; Spliethoff, H. The Biofficiency Project—Part 2: A Blueprint Design for the Next Generation of Biomass-Fired Cogeneration Plants. VGB PowerTech 2020, 100, 62–69. https://mediatum.ub.tum.de/node?id=1577107&change_language=en

Roumpedakis, T.C.; Christou, T.; Monokrousou, E.; Braimakis, K.; Karellas, S. Integrated ORC–adsorption cycle: A first- and second-law analysis of potential configurations. Energy 2019, 179, 46–58. https://doi.org/10.1016/j.energy.2019.04.069

Pallis, P.; Gkonis, N.; Varvagiannis, E.; Braimakis, K.; Karellas, S.; Katsaros, M. Cost-effectiveness assessment and beyond: A study on energy efficiency interventions in Greek residential building stock.
Energy and Buildings 2019, 182, 1–18. https://doi.org/10.1016/j.enbuild.2018.10.024

Pallis, P.; Gkonis, N.; Varvagiannis, E.; Braimakis, K.; Karellas, S.; Katsaros, M.; et al. Towards NZEB in Greece: A comparative study between cost optimality and energy efficiency for newly constructed residential buildings. Energy and Buildings 2019, 198, 115–137. https://doi.org/10.1016/j.enbuild.2019.06.005

Tzivanidis, C.; Bellos, E. Energetic, exergetic, and financial investigation of biomass-driven trigeneration system. Journal of Energy Engineering 2019, 145, 04019020. https://doi.org/10.1061/(ASCE)EY.1943-7897.0000622

Bellos, E.; Tzivanidis, C. Enhancing the performance of a CO₂ refrigeration system with the use of an absorption chiller. International Journal of Refrigeration 2019, 108, 37–52. https://doi.org/10.1016/j.ijrefrig.2019.09.009

Bellos, E.; Tzivanidis, C.; Nikolaou, N. Investigation and optimization of a solar-assisted heat pump driven by nanofluid-based hybrid PV. Energy Conversion and Management 2019, 198, 111831. https://doi.org/10.1016/j.enconman.2019.111831

Bellos, E.; Skaltsas, I.; Pliakos, O.; Tzivanidis, C. Energy and financial investigation of a cogeneration system based on linear Fresnel reflectors. Energy Conversion and Management 2019, 198, 111821.
https://doi.org/10.1016/j.enconman.2019.111821

Plytaria, M.; Tzivanidis, C.; Alexopoulos, I.; Bellos, E.; Antonopoulos, K. Comparison of two solar-assisted underfloor heating systems with phase change materials. International Journal of Thermodynamics 2019, 22, 138–147. https://doi.org/10.5541/ijot.495329

Bellos, E.; Tzivanidis, C. Design of a solar-driven cogeneration system using flat plate collectors and evacuated tube collectors. International Journal of Energy Research 2019, 43, 5841–5851.
https://doi.org/10.1002/er.4689

Bellos, E.; Tzivanidis, C.; Moghimi, M.A. Reducing the optical end losses of a linear Fresnel reflector using novel techniques. Solar Energy 2019, 186, 247–256. https://doi.org/10.1016/j.solener.2019.05.020

Bellos, E.; Daniil, I.; Tzivanidis, C. A cylindrical insert for parabolic trough solar collector. Heat and Fluid Flow 2019, 29, 1846–1876. https://doi.org/10.1108/HFF-05-2018-0190

Bellos, E.; Vrachopoulos, M.Gr.; Tzivanidis, C. Theoretical investigation of a novel hybrid refrigeration cycle based on the partial thermal isochoric compression. Thermal Science and Engineering Progress 2019, 11, 239–248. https://doi.org/10.1016/j.tsep.2019.04.003

Plytaria, M.T.; Tzivanidis, C.; Bellos, E.; Antonopoulos, K.A. Parametric analysis and optimization of an underfloor solar-assisted heating system with phase change materials. Thermal Science and Engineering Progress 2019, 10, 59–72. https://doi.org/10.1016/j.tsep.2019.01.010

Plytaria, M.T.; Bellos, E.; Tzivanidis, C.; Antonopoulos, K.A. Numerical simulation of a solar cooling system with and without phase change materials in radiant walls of a building. Energy Conversion and Management 2019, 188, 40–53. https://doi.org/10.1016/j.enconman.2019.03.042

Korres, D.N.; Tzivanidis, C.; Koronaki, I.P.; Nitsas, M.T. Experimental, numerical and analytical investigation of a U-type evacuated tube collectors array. Renewable Energy 2019, 135, 218–231.
https://doi.org/10.1016/j.renene.2018.12.003

Korres, D.N.; Tzivanidis, C. Development of two new semi-empirical formulas for estimation of solar absorptance in circular cavity receivers. Thermal Science and Engineering Progress 2019, 10, 147–153.
https://doi.org/10.1016/j.tsep.2019.01.017

Bellos, E.; Tzivanidis, C. CO₂ transcritical refrigeration cycle with dedicated subcooling: Mechanical compression vs. absorption chiller. Applied Sciences 2019, 9, 1605. https://doi.org/10.3390/app9081605

Korres, D.N.; Tzivanidis, C. Numerical investigation and optimization of an experimentally analyzed solar CPC. Energy 2019, 172, 57–67. https://doi.org/10.1016/j.energy.2019.01.119

Bellos, E.; Bousi, E.; Tzivanidis, C.; Pavlovic, S. Optical and thermal analysis of different cavity receiver designs for solar dish concentrators. Energy Conversion and Management: X 2019, 2, 100013. https://doi.org/10.1016/j.ecmx.2019.100013

Bellos, E.; Pavlovic, S.; Stefanovic, V.; Tzivanidis, C.; Nakomcic-Smaradgakis, B.B. Parametric analysis and yearly performance of a trigeneration system driven by solar-dish collectors. International Journal of Energy Research 2019, 43, 1534–1546. https://doi.org/10.1002/er.4380

Bellos, E.; Tzivanidis, C. Evaluation of a solar-driven trigeneration system with conventional and new criteria. International Journal of Sustainable Energy 2019, 38, 238–252. https://doi.org/10.1080/14786451.2018.1494173

Bellos, E.; Tzivanidis, C. Alternative designs of parabolic trough solar collectors. Progress in Energy and Combustion Science 2019, 71, 81–117. https://doi.org/10.1016/j.pecs.2018.11.001

Bellos, E.; Tzivanidis, C. A theoretical comparative study of CO₂ cascade refrigeration systems. Applied Sciences 2019, 9, 790. https://doi.org/10.3390/app9040790

Plytaria, M.T.; Bellos, E.; Tzivanidis, C.; Antonopoulos, K.A. Financial and energetic evaluation of solar-assisted heat pump underfloor heating systems with phase change materials. Applied Thermal Engineering 2019, 149, 548–564. https://doi.org/10.1016/j.applthermaleng.2018.12.075

Korres, D.; Bellos, E.; Tzivanidis, C. Investigation of a nanofluid-based compound parabolic trough solar collector under laminar flow conditions. Applied Thermal Engineering 2019, 149, 366–376. https://doi.org/10.1016/j.applthermaleng.2018.12.077

Bellos, E.; Tzivanidis, C. Multi-objective optimization of a solar-assisted heat pump driven by hybrid PV.
Applied Thermal Engineering 2019, 149, 528–535. https://doi.org/10.1016/j.applthermaleng.2018.12.059

Bellos, E.; Tzivanidis, C. Investigation of a booster secondary reflector for a parabolic trough solar collector.
Solar Energy 2019, 179, 174–185. https://doi.org/10.1016/j.solener.2018.12.071

Mitsopoulos, G.; Syngounas, E.; Tsimpoukis, D.; Bellos, E.; Tzivanidis, C.; Anagnostatos, S. Annual performance of a supermarket refrigeration system using different configurations with CO₂ refrigerant.
Energy Conversion and Management: X 2019, 1, 100006. https://doi.org/10.1016/j.ecmx.2019.100006

Bellos, E.; Tzivanidis, C.; Papadopoulos, A. Enhancing the performance of a linear Fresnel reflector using nanofluids and internal finned absorber. Journal of Thermal Analysis and Calorimetry 2019, 135, 237–255.
https://doi.org/10.1007/s10973-018-6989-1

Bellos, E.; Tzivanidis, C. Thermal efficiency enhancement of nanofluid-based parabolic trough collectors.
Journal of Thermal Analysis and Calorimetry 2019, 135, 597–608. https://doi.org/10.1007/s10973-018-7056-7

Bellos, E.; Tzivanidis, C. Investigation of a nanofluid-based concentrating thermal photovoltaic with a parabolic reflector. Energy Conversion and Management 2019, 180, 171–182. https://doi.org/10.1016/j.enconman.2018.11.008

Bellos, E.; Tzivanidis, C. A review of concentrating solar thermal collectors with and without nanofluids.
Journal of Thermal Analysis and Calorimetry 2019, 135, 763–786. https://doi.org/10.1007/s10973-018-7183-1

Bellos, E.; Tzivanidis, C. A comparative study of CO₂ refrigeration systems. Energy Conversion and Management: X 2019, 1, 100002. https://doi.org/10.1016/j.ecmx.2018.100002

Korres, D.; Tzivanidis, C. Thermal analysis of a serpentine flat plate collector and investigation of the flow and convection regime. Thermal Science 2019, 23, 47–59. https://doi.org/10.2298/TSCI161130172K

Braimakis, K.; Karellas, S. Exergetic optimization of double-stage organic Rankine cycle (ORC).
Energy 2018, 149, 296–313. https://doi.org/10.1016/j.energy.2018.02.044

Braimakis, K.; Karellas, S. Energetic optimization of regenerative organic Rankine cycle (ORC) configurations. Energy Conversion and Management 2018, 159, 353–370. https://doi.org/10.1016/j.enconman.2017.12.093

Staub, S.; Bazan, P.; Braimakis, K.; Müller, D.; Regensburger, C.; Scharrer, D.; Schmitt, B.; Steger, D.; German, R.; Karellas, S.; Pruckner, M.; Schlücker, E.; Will, S.; Karl, J. Reversible heat pump–organic Rankine cycle systems for the storage of renewable electricity. Energies 2018, 11, 1352. https://doi.org/10.3390/en11061352

Bellos, E.; Tzivanidis, C. Investigation of the environmentally-friendly refrigerant R152a for air conditioning purposes. Applied Sciences 2018, 8, 119. https://doi.org/10.3390/app9010119

Plytaria, M.T.; Tzivanidis, C.; Bellos, E.; Alexopoulos, I.; Antonopoulos, K.A. Thermal behavior of a building with incorporated phase change materials in the south and the north wall. Computation 2018, 7, 2.
https://doi.org/10.3390/computation7010002

Mitsopoulos, G.; Bellos, E.; Tzivanidis, C. Parametric analysis and multi-objective optimization of a solar heating system for various building envelopes. Thermal Science and Engineering Progress 2018, 8, 307–317. https://doi.org/10.1016/j.tsep.2018.09.007

Korres, D.; Tzivanidis, C. A new mini-CPC with a U-type evacuated tube under thermal and optical investigation. Renewable Energy 2018, 128, 529–540. https://doi.org/10.1016/j.renene.2017.06.054

Bellos, E.; Theodosiou, I.-C.; Vellios, L.; Tzivanidis, C. Investigation of a novel solar-driven refrigeration system with ejector. Thermal Science and Engineering Progress 2018, 8, 284–295. https://doi.org/10.1016/j.tsep.2018.09.005

Plytaria, M.T.; Tzivanidis, C.; Bellos, E.; Antonopoulos, K.A. Energetic investigation of solar-assisted heat pump underfloor heating systems with and without phase change materials. Energy Conversion and Management 2018, 173, 626–639. https://doi.org/10.1016/j.enconman.2018.08.010

Bellos, E.; Vellios, L.; Theodosiou, I.-C.; Tzivanidis, C. Investigation of a solar–biomass polygeneration system. Energy Conversion and Management 2018, 173, 283–295. https://doi.org/10.1016/j.enconman.2018.07.093

Bellos, E.; Tzivanidis, C.; Papadopoulos, A. Daily, monthly and yearly performance of a linear Fresnel reflector. Solar Energy 2018, 173, 517–529. https://doi.org/10.1016/j.solener.2018.08.008

Bellos, E.; Tzivanidis, C. Development of analytical expressions for the incident angle modifiers of a linear Fresnel reflector. Solar Energy 2018, 173, 769–779. https://doi.org/10.1016/j.solener.2018.08.019

Bellos, E.; Daniil, I.; Tzivanidis, C. Multiple cylindrical inserts for parabolic trough solar collector.
Applied Thermal Engineering 2018, 143, 80–89. https://doi.org/10.1016/j.applthermaleng.2018.07.086

Mitsopoulos, G.; Bellos, E.; Tzivanidis, C. Financial and energetic optimization of Greek buildings insulation. Designs 2018, 2, 34. https://doi.org/10.3390/designs2030034

Bellos, E.; Tzivanidis, C.; Torosian, K. Energetic, exergetic and financial evaluation of a solar-driven trigeneration system. Thermal Science and Engineering Progress 2018, 7, 99–106. https://doi.org/10.1016/j.tsep.2018.06.001

Bellos, E.; Tzivanidis, C.; Papadopoulos, A. Secondary concentrator optimization of a linear Fresnel reflector using Bezier polynomial parametrization. Solar Energy 2018, 171, 716–727.
https://doi.org/10.1016/j.solener.2018.07.025

Bellos, E.; Tzivanidis, C. Assessment of linear solar concentrating technologies for Greek climate.
Energy Conversion and Management 2018, 171, 1502–1513. https://doi.org/10.1016/j.enconman.2018.06.076

Bellos, E.; Said, Z.; Tzivanidis, C. The use of nanofluids in solar concentrating technologies: A comprehensive review. Journal of Cleaner Production 2018, 196, 84–99.
https://doi.org/10.1016/j.jclepro.2018.06.048

Bellos, E.; Tzivanidis, C.; Tsimpoukis, D. Enhancing the performance of parabolic trough collectors using nanofluids and turbulators. Renewable and Sustainable Energy Reviews 2018, 91, 358–375. https://doi.org/10.1016/j.rser.2018.03.091

Bellos, E.; Tzivanidis, C. Investigation of a star flow insert in a parabolic trough solar collector.
Applied Energy 2018, 224, 86–102. https://doi.org/10.1016/j.apenergy.2018.04.099

Bellos, E.; Tzivanidis, C. Development of an analytical model for the daily performance of solar thermal systems with experimental validation. Sustainable Energy Technologies and Assessments 2018, 28, 22–29.
https://doi.org/10.1016/j.seta.2018.05.003

Bellos, E.; Daniil, I.; Tzivanidis, C. Energetic and financial optimization of solar heat industrial process with parabolic trough collectors. Designs 2018, 2, 24. https://doi.org/10.3390/designs2030024

Bellos, E.; Tzivanidis, C. Parametric analysis and optimization of a cooling system with ejector–absorption chiller powered by solar parabolic trough collectors. Energy Conversion and Management 2018, 168, 329–342. https://doi.org/10.1016/j.enconman.2018.05.024

Bellos, E.; Tzivanidis, C.; Tsimpoukis, D. Optimum number of internal fins in parabolic trough collectors.
Applied Thermal Engineering 2018, 137, 669–677. https://doi.org/10.1016/j.applthermaleng.2018.04.037

Bellos, E.; Tzivanidis, C. Energetic and exergetic evaluation of a novel trigeneration system driven by parabolic trough solar collectors. Thermal Science and Engineering Progress 2018, 6, 41–47.
https://doi.org/10.1016/j.tsep.2018.03.008

Bellos, E.; Tzivanidis, C. Enhancing the performance of evacuated and non-evacuated parabolic trough collectors using twisted tape inserts, perforated plate inserts and internally finned absorber.
Energies 2018, 11, 1129. https://doi.org/10.3390/en11051129

Tsekouras, P.; Tzivanidis, C.; Antonopoulos, K. Optical and thermal investigation of a linear Fresnel collector with trapezoidal cavity receiver. Applied Thermal Engineering 2018, 135, 379–388.
https://doi.org/10.1016/j.applthermaleng.2018.02.082

Loni, R.; Pavlovic, S.; Bellos, E.; Tzivanidis, C.; Asli-Ardeh, E.A. Thermal and exergy performance of a nanofluid-based solar dish collector with spiral cavity receiver. Applied Thermal Engineering 2018, 135, 206–217. https://doi.org/10.1016/j.applthermaleng.2018.02.070

Bellos, E.; Tzivanidis, C. Thermal analysis of parabolic trough collector operating with mono and hybrid nanofluids. Sustainable Energy Technologies and Assessments 2018, 26, 105–115. https://doi.org/10.1016/j.seta.2017.10.005

Bellos, E.; Tzivanidis, C. Multi-objective optimization of a solar-driven trigeneration system.
Energy 2018, 149, 47–62. https://doi.org/10.1016/j.energy.2018.02.054

Bellos, E.; Tzivanidis, C. Analytical expression of parabolic trough solar collector performance.
Designs 2018, 2, 9. https://doi.org/10.3390/designs2010009

Bellos, E.; Tzivanidis, C.; Papadopoulos, A. Optical and thermal analysis of a linear Fresnel reflector operating with thermal oil, molten salt and liquid sodium. Applied Thermal Engineering 2018, 133, 70–80.
https://doi.org/10.1016/j.applthermaleng.2018.01.038

Bellos, E.; Tzivanidis, C. Multi-criteria evaluation of a nanofluid-based linear Fresnel solar collector.
Solar Energy 2018, 163, 200–214. https://doi.org/10.1016/j.solener.2018.02.007

Bellos, E.; Tzivanidis, C. Assessment of the thermal enhancement methods in parabolic trough collectors.
International Journal of Energy and Environmental Engineering 2018, 9, 59–70. https://doi.org/10.1007/s40095-017-0255-3

Stefanovic, V.P.; Pavlovic, S.R.; Bellos, E.; Tzivanidis, C. A detailed parametric analysis of a solar dish collector. Sustainable Energy Technologies and Assessments 2018, 25, 99–110. https://doi.org/10.1016/j.seta.2017.12.005

Bellos, E.; Tzivanidis, C. Performance analysis and optimization of an absorption chiller driven by nanofluid-based solar flat plate collector. Journal of Cleaner Production 2018, 174, 256–272.
https://doi.org/10.1016/j.jclepro.2017.10.313

Bellos, E.; Tzivanidis, C. A realistic approach of the maximum work extraction from solar thermal collectors. Applied Sciences 2018, 8, 6. https://doi.org/10.3390/asi1010006

Bellos, E.; Tzivanidis, C.; Tsimpoukis, D. Thermal, hydraulic and exergetic evaluation of a parabolic trough collector operating with thermal oil and molten salt-based nanofluids. Energy Conversion and Management 2018, 156, 388–402. https://doi.org/10.1016/j.enconman.2017.11.051

Bellos, E.; Tzivanidis, C. Investigation of a hybrid ORC driven by waste heat and solar energy.
Energy Conversion and Management 2018, 156, 427–439. https://doi.org/10.1016/j.enconman.2017.11.058

Bellos, E.; Pavlovic, S.R.; Vasiljević, D.; Stefanovic, V.P.; Tzivanidis, C. Experimental and numerical investigation of a triple-dish solar concentrator: A thermal and exergy study. International Journal of Exergy 2018, 26, 481. https://doi.org/10.1504/IJEX.2018.093191

Braimakis, K.; Karellas, S. Integrated thermo-economic optimization of standard and regenerative ORC for different heat source types and capacities. Energy 2017, 121, 570–598. https://doi.org/10.1016/j.energy.2017.01.042

Braimakis, K.; Thimo, A.; Karellas, S. Techno-economic analysis and comparison of a solar-based biomass ORC–VCC system and a PV heat pump for domestic trigeneration. Journal of Energy Engineering 2017, 143, 04016048. https://doi.org/10.1061/(ASCE)EY.1943-7897.0000397

Han, X.; Karellas, S.; Liu, M.; Braimakis, K.; Chen, W.; Yan, J.; et al. Integration of organic Rankine cycle with lignite flue gas pre-drying for waste heat and water recovery from dryer exhaust gas: Thermodynamic and economic analysis. Energy Procedia 2017, 105, 1614–1621. https://doi.org/10.1016/j.egypro.2017.03.518

Roumpedakis, T.C.; Chapaloglou, S.; Pallis, P.; Leontaritis, A.-D.; Braimakis, K.; Karellas, S.; Vourliotis, P.
Experimental investigation and CFD analysis of heat transfer in single-phase subcooler of a small-scale waste heat recovery ORC. Energy Procedia 2017, 129, 487–494. https://doi.org/10.1016/j.egypro.2017.09.166

Bellos, E.; Tzivanidis, C.; Belessiotis, V. Daily performance of parabolic trough solar collectors.
Solar Energy 2017, 158, 663–678. https://doi.org/10.1016/j.solener.2017.10.038

Bellos, E.; Tzivanidis, C. Yearly performance of a hybrid PV operating with nanofluid.
Renewable Energy 2017, 113, 867–884. https://doi.org/10.1016/j.renene.2017.06.060

Bellos, E.; Tzivanidis, C. Parametric investigation of supercritical carbon dioxide utilization in parabolic trough collectors. Applied Thermal Engineering 2017, 127, 736–747. https://doi.org/10.1016/j.applthermaleng.2017.08.032

Bellos, E.; Tzivanidis, C. Parametric analysis and optimization of an organic Rankine cycle with nanofluid-based solar parabolic trough collectors. Renewable Energy 2017, 114, 1376–1393. https://doi.org/10.1016/j.renene.2017.06.055

Bellos, E.; Tzivanidis, C. Optimum design of a solar ejector refrigeration system for various operating scenarios. Energy Conversion and Management 2017, 154, 11–24. https://doi.org/10.1016/j.enconman.2017.10.057

Bellos, E.; Tzivanidis, C.; Tsimpoukis, D. Thermal enhancement of parabolic trough collector with internally finned absorbers. Solar Energy 2017, 157, 514–531. https://doi.org/10.1016/j.solener.2017.08.067

Bellos, E.; Tzivanidis, C.; Tsimpoukis, D. Multi-criteria evaluation of parabolic trough collector with internally finned absorbers. Applied Energy 2017, 205, 540–561. https://doi.org/10.1016/j.apenergy.2017.07.141

Bellos, E.; Tzivanidis, C.; Daniil, I. Thermal and exergetic evaluation of parabolic trough collectors with finned absorbers operating with air. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 2017, 231, 631–644. https://doi.org/10.1177/0957650917712403

Bellos, E.; Tzivanidis, C. Energetic and financial analysis of solar cooling systems with single-effect absorption chiller in various climates. Applied Thermal Engineering 2017, 126, 809–821.
https://doi.org/10.1016/j.applthermaleng.2017.08.005

Bellos, E.; Tzivanidis, C. A detailed exergetic analysis of parabolic trough collectors. Energy Conversion and Management 2017, 149, 275–292. https://doi.org/10.1016/j.enconman.2017.07.035

Bellos, E.; Vrachopoulos, M.Gr.; Tzivanidis, C. Energetic and exergetic investigation of a novel solar-assisted mechanical compression refrigeration system. Energy Conversion and Management 2017, 147, 1–18. https://doi.org/10.1016/j.enconman.2017.05.040

Bellos, E.; Tzivanidis, C.; Tsifis, G. Energetic, exergetic, economic and environmental (4E) analysis of a solar-assisted refrigeration system for various operating scenarios. Energy Conversion and Management 2017, 148, 1055–1069. https://doi.org/10.1016/j.enconman.2017.06.063

Bellos, E.; Tzivanidis, C.; Pavlovic, S.; Stefanovic, V. Thermodynamic investigation of LiCl–H₂O working pair in a double-effect absorption chiller driven by parabolic trough collectors. Thermal Science and Engineering Progress 2017, 3, 75–87. https://doi.org/10.1016/j.tsep.2017.06.005

Bellos, E.; Tzivanidis, C. Parametric analysis and optimization of a solar-driven trigeneration system based on ORC and absorption heat pump. Journal of Cleaner Production 2017, 161, 493–509.
https://doi.org/10.1016/j.jclepro.2017.05.159

Bellos, E.; Tzivanidis, C. Energetic and financial sustainability of solar-assisted heat pump heating systems in Europe. Sustainable Cities and Society 2017, 33, 70–84. https://doi.org/10.1016/j.scs.2017.05.020

Pavlovic, S.; Bellos, E.; Le Roux, W.G.; Stefanovic, V.; Tzivanidis, C. Experimental investigation and parametric analysis of a solar thermal dish collector with spiral absorber. Applied Thermal Engineering 2017, 121, 126–135. https://doi.org/10.1016/j.applthermaleng.2017.04.068

Bellos, E.; Tzivanidis, C. Optimization of a solar-driven trigeneration system with nanofluid-based parabolic trough collectors. Energies 2017, 10, 848. https://doi.org/10.3390/en10070848

Pavlovic, S.; Bellos, E.; Stefanovic, V.; Tzivanidis, C. Optimum geometry of parabolic trough collectors with optical and thermal criteria. International Review of Applied Sciences and Engineering 2017, 8, 45–50.
https://doi.org/10.1556/1848.2017.8.1.7

Bellos, E.; Tzivanidis, C.; Daniil, I. Energetic and exergetic investigation of a parabolic trough collector with internal fins operating with carbon dioxide. International Journal of Energy and Environmental Engineering 2017, 8, 109–122. https://doi.org/10.1007/s40095-017-0229-5

Bellos, E.; Tzivanidis, C. Parametric investigation of nanofluids utilization in parabolic trough collectors.
Thermal Science and Engineering Progress 2017, 2, 71–79. https://doi.org/10.1016/j.tsep.2017.05.001

Bellos, E.; Tzivanidis, C.; Antonopoulos, K.A. Parametric analysis and optimization of a solar-assisted gas turbine. Energy Conversion and Management 2017, 139, 151–165. https://doi.org/10.1016/j.enconman.2017.02.042

Bellos, E.; Tzivanidis, C.; Symeou, C.; Antonopoulos, K.A. Energetic, exergetic and financial evaluation of a solar-driven absorption chiller: A dynamic approach. Energy Conversion and Management 2017, 137, 34–48. https://doi.org/10.1016/j.enconman.2017.01.041

Bellos, E.; Tzivanidis, C.; Daniil, I.; Antonopoulos, K.A. The impact of internal longitudinal fins in parabolic trough collectors operating with gases. Energy Conversion and Management 2017, 135, 35–54.
https://doi.org/10.1016/j.enconman.2016.12.057

Bellos, E.; Tzivanidis, C.; Antonopoulos, K.A. A detailed working fluid investigation for solar parabolic trough collectors. Applied Thermal Engineering 2017, 114, 374–386.
https://doi.org/10.1016/j.applthermaleng.2016.11.201

Karellas, S.; Braimakis, K. Energy–exergy analysis and economic investigation of a cogeneration and trigeneration ORC–VCC hybrid system utilizing biomass fuel and solar power. Energy Conversion and Management 2016, 107, 103–113. https://doi.org/10.1016/j.enconman.2015.06.080

Kalogirou, S.A.; Karellas, S.; Badescu, V.; Braimakis, K. Exergy analysis on solar thermal systems: A better understanding of their sustainability. Renewable Energy 2016, 85, 1328–1333.
https://doi.org/10.1016/j.renene.2015.05.037

Kalogirou, S.A.; Karellas, S.; Braimakis, K.; Stanciu, C.; Badescu, V. Exergy analysis of solar thermal collectors and processes. Progress in Energy and Combustion Science 2016, 56, 106–137.
https://doi.org/10.1016/j.pecs.2016.05.002

Bellos, E.; Tzivanidis, C.; Zisopoulou, E.; Mitsopoulos, G.; Antonopoulos, K.A. An innovative Trombe wall as a passive heating system for a building in Athens—a comparison with the conventional Trombe wall and the insulated wall. Energy and Buildings 2016, 133, 754–769. https://doi.org/10.1016/j.enbuild.2016.10.035

Bellos, E.; Mathioulakis, E.; Tzivanidis, C.; Belessiotis, V.; Antonopoulos, K.A. Experimental and numerical investigation of a linear Fresnel solar collector with flat plate receiver. Energy Conversion and Management 2016, 130, 44–59. https://doi.org/10.1016/j.enconman.2016.10.041

Bellos, E.; Tzivanidis, C.; Antonopoulos, K.A. Parametric investigation and optimization of an innovative trigeneration system. Energy Conversion and Management 2016, 127, 515–525. https://doi.org/10.1016/j.enconman.2016.09.044

Tzivanidis, C.; Bellos, E.; Antonopoulos, K.A. Energetic and financial investigation of a stand-alone solar-thermal organic Rankine cycle power plant. Energy Conversion and Management 2016, 126, 421–433.
https://doi.org/10.1016/j.enconman.2016.08.033

Bellos, E.; Tzivanidis, C.; Antonopoulos, K.A.; Daniil, I. The use of gas working fluids in parabolic trough collectors—an energetic and exergetic analysis. Applied Thermal Engineering 2016, 109, 1–14.
https://doi.org/10.1016/j.applthermaleng.2016.08.043

Tzivanidis, C.; Bellos, E. The use of parabolic trough collectors for solar cooling—a case study for Athens climate. Case Studies in Thermal Engineering 2016, 8, 403–413. https://doi.org/10.1016/j.csite.2016.10.003

Bellos, E.; Tzivanidis, C.; Antonopoulos, K.A. Exergetic and energetic comparison of LiCl–H₂O and LiBr–H₂O working pairs in a solar absorption cooling system. Energy Conversion and Management 2016, 123, 453–461. https://doi.org/10.1016/j.enconman.2016.06.068

Tzivanidis, C.; Bellos, E.; Mitsopoulos, G.; Antonopoulos, K.A.; Delis, A. Energetic and financial evaluation of a solar-assisted heat pump heating system with other usual heating systems in Athens.
Applied Thermal Engineering 2016, 106, 87–97. https://doi.org/10.1016/j.applthermaleng.2016.06.004

Bellos, E.; Tzivanidis, C.; Antonopoulos, K.A.; Gkinis, G. Thermal enhancement of solar parabolic trough collectors by using nanofluids and converging–diverging absorber tube. Renewable Energy 2016, 94, 213–222. https://doi.org/10.1016/j.renene.2016.03.062

Bellos, E.; Korres, D.; Tzivanidis, C.; Antonopoulos, K.A. Design, simulation and optimization of a compound parabolic collector. Sustainable Energy Technologies and Assessments 2016, 16, 53–63.
https://doi.org/10.1016/j.seta.2016.04.005

Bellos, E.; Tzivanidis, C.; Moschos, K.; Antonopoulos, K.A. Energetic and financial evaluation of solar-assisted heat pump space heating systems. Energy Conversion and Management 2016, 120, 306–319.
https://doi.org/10.1016/j.enconman.2016.05.004

Bellos, E.; Tzivanidis, C.; Antonopoulos, K.A. Exergetic, energetic and financial evaluation of a solar-driven absorption cooling system with various collector types. Applied Thermal Engineering 2016, 102, 749–759. https://doi.org/10.1016/j.applthermaleng.2016.04.032

Tsekouras, P.; Drosou, V.; Tzivanidis, C.; Antonopoulos, K.A. Experimental results of a solar absorption cooling plant in Greece. International Journal of Sustainable Energy 2016, 35, 309–322. https://doi.org/10.1080/14786451.2014.899229

Pavlovic, S.; Bellos, E.; Stefanovic, V.; Tzivanidis, C.; Stamenkovic, Z. Design, simulation and optimization of a solar dish collector with spiral-coil thermal absorber. Thermal Science 2016, 20, 1387–1397.
https://doi.org/10.2298/TSCI160213104P

Braimakis, K.; Preißinger, M.; Brüggemann, D.; Karellas, S.; Panopoulos, K. Low grade waste heat recovery with subcritical and supercritical organic Rankine cycle based on natural refrigerants and their binary mixtures. Energy 2015, 88, 80–92. https://doi.org/10.1016/j.energy.2015.03.092

Tzivanidis, C.; Bellos, E.; Korres, D.; Antonopoulos, K.A.; Mitsopoulos, G. Thermal and optical efficiency investigation of a parabolic trough collector. Case Studies in Thermal Engineering 2015, 6, 226–237.
https://doi.org/10.1016/j.csite.2015.10.005

Braimakis, K.; Atsonios, K.; Panopoulos, K.D.; Karellas, S.; Kakaras, E. Economic evaluation of decentralized pyrolysis for the production of bio-oil as an energy carrier for improved logistics towards a large centralized gasification plant. Renewable and Sustainable Energy Reviews 2014, 35, 57–72.
https://doi.org/10.1016/j.rser.2014.03.052

Tzivanidis, C.; Antonopoulos, K.A.; Kravvaritis, E.D. Parametric analysis of space cooling systems based on night ceiling cooling with PCM-embedded piping. International Journal of Energy Research 2012, 36, 18–35. https://doi.org/10.1002/er.1777

Tzivanidis, C.; Antonopoulos, K.A.; Kravvaritis, E.D. Transient three-dimensional numerical solution of night ceiling cooling using PCM-embedded piping. Journal of Energy Engineering 2011, 137, 177–186.
https://doi.org/10.1061/(ASCE)EY.1943-7897.0000048

Kravvaritis, E.D.; Antonopoulos, K.A.; Tzivanidis, C. Experimental determination of the effective thermal capacity function and other thermal properties for various phase change materials using the thermal delay method. Applied Energy 2011, 88, 4459–4469. https://doi.org/10.1016/j.apenergy.2011.05.032

Tzivanidis, C.; Antonopoulos, K.A.; Gioti, F. Numerical simulation of cooling energy consumption in connection with thermostat operation mode and comfort requirements for the Athens buildings. Applied Energy 2011, 88, 2871–2884. https://doi.org/10.1016/j.apenergy.2011.01.050

Antonopoulos, K.A.; Gioti, F.; Tzivanidis, C. A transient model for the energy analysis of indoor spaces. Applied Energy 2010, 87, 3084–3091. https://doi.org/10.1016/j.apenergy.2010.04.002

Kravvaritis, E.D.; Antonopoulos, K.A.; Tzivanidis, C. Improvements to the measurement of the thermal properties of phase change materials. Measurement Science and Technology 2010, 21, 045103. https://doi.org/10.1088/0957-0233/21/4/045103

Antonopoulos, K.A.; Vrachopoulos, M.; Tzivanidis, C. Experimental evaluation of energy savings in air-conditioning using metal ceiling panels. Applied Thermal Engineering 1998, 18, 1129–1138. https://doi.org/10.1016/S1359-4311(98)00022-2

Antonopoulos, K.A.; Vrachopoulos, M.; Tzivanidis, C. Experimental and theoretical studies of space cooling using ceiling-embedded piping. Applied Thermal Engineering 1997, 17, 351–367. https://doi.org/10.1016/S1359-4311(96)00040-3

Antonopoulos, K.A.; Tzivanidis, C.; Vrachopoulos, M. Using orthogonal expansion of functions over multilayer walls for calculating the layer thermal properties. Applied Thermal Engineering 1997, 17, 193–201. https://doi.org/10.1016/S1359-4311(96)00015-4

Antonopoulos, K.A.; Tzivanidis, C. Numerical solution of unsteady three-dimensional heat transfer during space cooling using ceiling-embedded piping. Energy 1997, 22, 59–67. https://doi.org/10.1016/S0360-5442(96)00079-5

Antonopoulos, K.A.; Tzivanidis, C. Finite-difference prediction of transient indoor temperature and related correlation based on the building time constant. International Journal of Energy Research 1996, 20, 507–520. https://doi.org/10.1002/(SICI)1099-114X(199606)20:6%3C507::AID-ER167%3E3.0.CO;2-T

Antonopoulos, K.A.; Tzivanidis, C. Analytical solution of boundary value problems of heat conduction in composite regions with arbitrary convection boundary conditions. Acta Mechanica 1996, 118, 65–78. https://doi.org/10.1007/BF01410508

Antonopoulos, K.A.; Tzivanidis, C. A correlation for the thermal delay of buildings. Renewable Energy 1995, 6, 687–699. https://doi.org/10.1016/0960-1481(95)00076-V

Antonopoulos, K.A.; Tzivanidis, C. Time constant of Greek buildings. Energy 1995, 20, 785–802. https://doi.org/10.1016/0360-5442(95)00015-9