Pomoni DI, Koukou MK, Vrachopoulos MG, Vasiliadis L. A Review of Hydroponics and Conventional Agriculture Based on Energy and Water Consumption, Environmental Impact, and Land Use. Energies. 2023;16(4):1690.

Tsimpoukis D, Syngounas E, Bellos E, Koukou M, Tzivanidis C, Anagnostatos S, Vrachopoulos MG. Thermodynamic and economic analysis of a supermarket transcritical CO2 refrigeration system coupled with solar-fed supercritical CO2 Brayton and organic Rankine cycles. Energy Conversion and Management: X. 2023:100351.

Konstantaras J, Pagkalos C, Koukou M, Lymperis K, Caouris Y, Vrachopoulos M. Controller Evaluation for Solar-Latent Thermal Energy Applications. Journal of Energy and Power Technology. 2022;4(2):1-15.

Syngounas E, Tsimpoukis D, Koukou MK, Vrachopoulos MG. Energetic, exergetic and financial evaluation of a solar-powered absorption chiller integration into a CO2 commercial refrigeration system. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy. 2022;236(6):1192-1209.

Coelho L, Koukou MK, Dogkas G, Konstantaras J, Vrachopoulos MG, Rebola A, Benou A, Choropanitis J, Karytsas C, Sourkounis C. Latent Thermal Energy Storage Application in a Residential Building at a Mediterranean Climate. Energies. 2022;15(3):1008.

Spandonidis CC, Theodoropoulos P, Pariotis EG, Zannis TC, Polyzos S, Alexiou K, Konstantaras J, Koukou M, Vrachopoulos GM. Meta-data analysis, prospects, challenges, and a roadmap for optimal ship energy management using a digital twin. In: Sustainable Development and Innovations in Marine Technologies. CRC Press; 2022. pp. 93-99.

Koukou MK, Pagkalos C, Dogkas G, Vrachopoulos MG, Douvi E, Caouris YG, Papadopoulos P. Computational approach of charging and discharging phases in a novel compact solar collector with integrated thermal energy storage tank: study of different phase change materials. Energies. 2022;15(3):1113.

Syngounas E., Tsimpoukis D. KVMGVMK. Integration of a solar-powered absorption chiller for performance enhancement of a supermarket CO2 refrigeration plant. Green Energy and Sustainability. 2022;2(1):2003.

St.Markolefas, M.K.Koukou EDJKGDYCMGVCP. Development of a Novel Compact Flat Plate Solar Collector Integrated with LHTES Tank: Finite Element Analysis to Evaluate Optimum Tank Insulation and Structural Analysis of the Supporting Base. 8th International Conference on Energy, Sustainability and Climate Crisis, August 30 - September 3, 2021, Volos, Greece http://escc.uth.gr/wp-content/uploads/2021/08/%CE%95SCC-2021-Final-Program.pdf. 2021.

M.K. Koukou, J.Konstantaras GDKLVNSMGVEDYCPD. Development of a novel compact flat-plate solar collector integrated with thermal energy storage: experimental evaluation of the energy stored under outdoors conditions. 13th International Conference on Sustainable Energy & Environmental Protection, 13th – 16th September 2021, Vienna Austria. 2021;1(1):395-400.

Syngounas E. Energetic and financial evaluation of a solar-powered absorption chiller integration into a CO2 commercial refrigeration system, Syngounas E., Tsimpoukis D., Anagnostatos SD, Koukou MK, Vrachopoulos M. Gr., 9th Eur. Conf. Ren. Energy Sys. 2021:21-23.

Tsimpoukis D, Syngounas E, Bellos E, Koukou M, Tzivanidis C, Anagnostatos S, Vrachopoulos MG. 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.

Douvi E, Pagkalos C, Dogkas G, Koukou MK, Stathopoulos VN, Caouris Y, Vrachopoulos MG. Phase change materials in solar domestic hot water systems: A review. International Journal of Thermofluids. 2021;10:100075.

Dogkas G, Konstantaras J, Koukou MK, Vrachopoulos MG, Pagkalos C, Stathopoulos VN, Pandis PK, Lymperis K, Coelho L, Rebola A. Development and experimental testing of a compact thermal energy storage tank using paraffin targeting domestic hot water production needs. Thermal Science and Engineering Progress. 2020;19:100573.

Pagkalos C, Dogkas G, Koukou MK, Konstantaras J, Lymperis K, Vrachopoulos MG. Evaluation of water and paraffin PCM as storage media for use in thermal energy storage applications: A numerical approach. International Journal of Thermofluids. 2020;1:100006.

Koukou MK, Dogkas G, Vrachopoulos MG, Konstantaras J, Pagkalos C, Stathopoulos VN, Pandis PK, Lymperis K, Coelho L, Rebola A. Experimental assessment of a full scale prototype thermal energy storage tank using paraffin for space heating application. International Journal of Thermofluids. 2020;1:100003.

Dogkas G, Koukou MK, Konstantaras J, Pagkalos C, Lymperis K, Stathopoulos V, Coelho L, Rebola A, Vrachopoulos MG. Investigating the performance of a thermal energy storage unit with paraffin as phase change material, targeting buildings’ cooling needs: an experimental approach. International Journal of Thermofluids. 2020;3:100027.

Tourou P, Konstantaras J, Vrachopoulos GM, Sourkounis C, Koukou MK, Pagkalos C, Lymperis K, Dogkas G. Validation of a control algorithm for the efficient charging of PCM energy storage tanks using an emulation platform. Proceedings of the 8th International Conference ENERGY in BUILDINGS. 2019;2019.

Dogkas G, Konstantaras J, Koukou MK, Stathopoulos VN, Coelho L, Rebola A. Evaluating a prototype compact thermal energy storage tank using paraffin-based phase change material for domestic hot water production. E3S Web of Conferences. 2019;116:00016.

Koukou MK, Dogkas G, Vrachopoulos MG, Konstantaras J, Pagkalos C, Lymperis K, Stathopoulos V, Evangelakis G, Prouskas C, Coelho L. Performance evaluation of a small-scale latent heat thermal energy storage unit for heating applications based on a nanocomposite organic PCM. ChemEngineering. 2019;3(4):88.

Koukou MK, Vrachopoulos MG, Dogkas G, Pagkalos C, Lymperis K, Coelho L, Rebola A. Testing the performance of a prototype thermal energy storage tank working with organic phase change material for space heating application conditions. E3S Web of Conferences. 2019;116:00038.

Pandis PK, Papaioannou S, Koukou MK, Vrachopoulos MG, Stathopoulos VN. Differential scanning calorimetry based evaluation of 3D printed PLA for phase change materials encapsulation or as container material of heat storage tanks. Energy Procedia. 2019;161:429-437.

Vrachopoulos GM, Koukou MK, Dogkas G, Tachos N. Experimental Performance Evaluation of a Small Scale ORC Power Unit Working with Low Temperature Energy Sources for Power Co-generation. 2018.

and M.K. Koukou, M.Gr. Vrachopoulos DPKLSGCJK. Study of Heat Transfer in a Latent Heat Storage System using Salt Hydrates for Domestic Heating Applications. Proceedings of Energy in Buildings 2018, organized by ASHRAE Greek Chapter, 3rd November, Athens, Greece, 2018. 2018.

Koukou MK, Vrachopoulos MG, Tachos N, Tsolakoglou N. Design and development of a 10-kWe ORC installation working with low-temperature sources. International Journal of Sustainable Energy. 2018;37(9):857-872.

Koukou MK, Vrachopoulos MG, Tachos NS, Dogkas G, Lymperis K, Stathopoulos V. Experimental and computational investigation of a latent heat energy storage system with a staggered heat exchanger for various phase change materials. Thermal Science and Engineering Progress. 2018;7:87-98.

Chalkia V, Tachos N, Pandis PK, Giannakas A, Koukou MK, Vrachopoulos MG, Coelho L, Ladavos A, Stathopoulos VN. Influence of organic phase change materials on the physical and mechanical properties of HDPE and PP polymers. RSC advances. 2018;8(48):27438-27447.

Tsolakoglou NP, Koukou MK, Vrachopoulos MG, Tachos N, Lymberis K, Stathopoulos V. Experimental process investigation of a latent heat energy storage system with a staggered heat exchanger with different phase change materials for solar thermal energy storage applications. E3S Web of Conferences. 2017;22:00179.

Vrachopoulos GM, Tachos NS, Karanasiou GK, Koukou MK. Efficient Organic Rankine Cycle (ORC) Power Generation with low grade energy as heat source preliminary design of Effi low res ORC. Recent Advances in Fluid Mechanics and Thermal Engineering, WSEAS Press. 2015.

Vrachopoulos GM, Kravvaritis E, Stavlas DG, Stamatopoulos V, Gonidis A, Koukou MK. Investigating the performance of a test phase change material chamber for passive solar applications: experimental and theoretical approach. International Journal of Sustainable Energy. 2015;34(9):614-627.

Vrachopoulos M, Koukou M, Karytsas K, Βραχόπουλος Μιχάλης, Κούκου Μαρία, Καρύτσας Κωνσταντίν. NORMAL GEOTHERMY-DESIGN PRINCIPLES OF GEOTHERMAL SYSTEMS AND APPLICATIONS. 2015.

Vrachopoulos GM, Tachos NS, Koukou MK, Karanasiou GK, Karytsas C, Tsekouras P, Drosou V. Pre-assessment of a low-temperature geothermal and solar ORC system for power co-generation: the Effi low res approach. WSEAS Transactions on Environment and Development. 2015;11:228-236.

Vrachopoulos GM, Koukou MK, Tachos N, Kalognomos S, Adamidis A, Lavrenti F, Pappas J, Xygogianni P, Karytsas C. Implementing the GEOPEAK Project in Greece towards the achievement of Europe 20-‐20-‐20 targets: Development and Evaluation of a Geothermal Heat Pump of High Efficiency. 2014.

Vogiannis E, Nikolopoulos D, Koukou M, Kottou S, Vrachopoulos M. Radon entrance and its daily movement into a closed detached of three level house. Physica Medica: European Journal of Medical Physics. 2014;30:e91.

Vrachopoulos MG, Koukou MK, Filos G, Moraitis C. Investigation of heat transfer in a triple-glazing type window at greek climate conditions. Central European Journal of Engineering. 2013;3(4):750-763.

Thanos GA, Vrachopoulos MG, Koukou MK, Kakouris AP, Koulis A, Thanos A. Residence site selection in urban and rural areas in Greece: a multiple-criteria decision analysis approach. International Journal of Applied Management Science 9. 2012;4(1):36-51.

Vrachopoulos MG, Koukou MK, Stavlas DG, Stamatopoulos VN, Gonidis AF, Kravvaritis ED. Testing reflective insulation for improvement of buildings energy efficiency. Central European Journal of Engineering. 2012;2(1):83-90.

Vrachopoulos MG, Koukou MK, Stavlas DG, Stamatopoulos VN, Gonidis AF, Krawaritis ED. Enhancement of Solar Thermal Energy Storage using Phase Change Materials: an Experimental Study at Greek Climate Conditions. International Review of Mechanical Engineering. 2011;5(2):279-284.

Thanos G, Gr VM, Koukou MK, Kakouris AP, Thanos AG. Residence site selection in urban and rural environments in Greece: a multiple-criteria decision analysis approach. 9th Special Conference of HELORS on “Quantitative Models in the Managerial and Financial Decision Making” Agios Nikolaos, Crete, Greece on 27th-29th May. 2010.

Maria K. Koukou, Michail Gr. Vrachopoulos MGSNCM. EXPERIMENTAL AND NUMERICAL ANALYSIS OF NATURAL VENTILATION IN BUILDINGS. 2008.

Vrachopoulos GM, Stavlas DG, Kravvaritis LD, Koukou MK, Vlachakis NW, Orfanoudakis NG, Mavromatis SA, Gonidis AG. Performance testing of reflective insulation applied in a prototype experimental chamber in Greece: experimental results for summer and winter periods. Advanced Computational Methods and Experiments in Heat Transfer X. 2008;61:191.

Stavrakakis GM, Koukou MK, Vrachopoulos GM, Markatos NC. Natural cross-ventilation in buildings: Building-scale experiments, numerical simulation and thermal comfort evaluation. Energy and buildings. 2008;40(9):1666-1681.

and P.L. Zervas, A. Tatsis SKMHMKN. CFD Modeling and optimization of fuel cell systems. In: Progress in Fuel Cell Research. Peter V. Alemo, Nova Science Publishers; 2007. pp. 147-214.

Hatziapostolou A, Orfanoudakis NG, Koukou MK, Raptis G. CFD Modeling of the Flow Field inside a Furnace Produced by a Laboratory-Scale Combustor. 2007.

Papaefthimiou VD, Katsanos CO, Vrachopoulos GM, Filios AE, Koukou MK, Layrenti FG. Experimental measurements and theoretical predictions of flowfield and temperature distribution inside a wall solar chimney. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science. 2007;221(1):33-41.

Bacharoudis E, Vrachopoulos MG, Koukou MK, Margaris D, Filios AE, Mavrommatis SA. Study of the natural convection phenomena inside a wall solar chimney with one wall adiabatic and one wall under a heat flux. Applied Thermal Engineering. 2007;27(13):2266-2275.

Hatziapostolou A, Orfanoudakis NG, Koukou MK, Raptis G. CFD modeling of the swirl-stabilised flame produced by a laboratory-scale combustor: selection of the turbulence model. Proceedings of the 4th WSEAS International Conference on Heat Transfer, Thermal Engineering and Environment, Elounda, Greece. 2006:21-23.

P.L. Zervas, M.K. Koukou OMNGN-CG. Evaluating low-temperature fuel cell performance for power generation: fluid dynamics study of phosphoric acid fuel cell systems at the cell level. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy. 2006;220(6):525-533.

Vrachopoulos GM, Koukou MK, Kotsiovelos G, Kravvaritis E, Ioannidou P. Experimental evaluation of the performance of reflective insulation for improvement of indoor thermal environmental conditions. WSEAS Transactions on Environment and Development. 2006;2(3):173-177.

Hatziapostolou A, Krallis K, Orfanoudakis NG, Koukou MK, Chatzifotis D, Raptis G. Numerical prediction of the flow field produced by a laboratory-scale combustor: a preliminary isothermal investigation. WSEAS Transactions on Fluid Mechanics. 2006;1(3):230.

Bacharoudis E, Vrachopoulos GM, Koukou MK, Filios AE. Numerical investigation of the buoyancy-induced flow field and heat transfer inside solar chimneys. WSEAS Transactions on Heat and Mass Transfer. 2006;1(2):193.

Zervas PL, Koukou MK, Markatos N-C. Predicting the effects of process parameters on the performance of phosphoric acid fuel cells using a 3-D numerical approach. Energy conversion and management. 2006;47(18-19):2883-2899.

Vrachopoulos GM, Koukou MK, Vlachakis NW, Orfanoudakis NG, Thanos G, Filios AE, Kaldelis J. Developing efficient tools to evaluate indoor environmentissues: on-site measurements and numerical simulation of indoor air flow in a test room. WSEAS Transactions on Environment and Development. 2005;1(2):288-293.

Zervas P, Koukou MK, Vlachakis NW, Markatos N-C. Studying transport phenomena in fuel cells: effect of flow pattern on the performance of phosphoric acid fuel cells. IASME Trans. 2005;2:275-280.

Markatos NC, Vogiatzis E, Koukou MK, Papayannakos N. Membrane reactor modelling: A comparative study to evaluate the role of combined mass and heat dispersion in large-scale adiabatic membrane modules. Chemical Engineering Research and Design. 2005;83(10):1171-1178.

and Karounou, E.K. KMTFBMKJA. Measurement of solid particles residence time distribution in a kiln line of the Greek cement works Heracles II. Cement International. 2004;2(1):80-87.

Vogiatzis E, Koukou MK, Papayannakos N, Markatos NC. Heat Dispersion Effects on the Functional Characteristics of Industrial‐scale Adiabatic Membrane Reactors. Chemical Engineering & Technology: Industrial Chemistry‐Plant Equipment‐Process Engineering‐Biotechnology. 2004;27(8):857-865.

Filios AE, Margaris DP, Bouras AG, Koukou MK, Vlachakis NW. NUMERICAL SIMULATION OF SUBSONIC WIND TUNNELS: A PRELIMINARY APPROACH. 2002.

Liakos HH, Koukou MK, Founti MA, Markatos NC. Industrial-scale processing of granite surfaces by natural gas jet flames. Applied thermal engineering. 2002;22(4):393-405.

Xenidou TC, Koukou MK, Boudouvis AG, Markatos NC. Computational analysis of horizontal cold wall CVD reactors at low pressure: application to tungsten deposition from pyrolysis of W (CO) 6. Le Journal de Physique IV. 2001;11(PR3):Pr3-183-Pr3-188.

Liakos HH, Koukou MK, Founti MA, Markatos NC. Gaseous fuel assessment in industrial impinging flames with local extinction effects. Chemical engineering & technology. 2001;24(12):1289-1294.

Koukou MK, Papayannakos N, Markatos NC. On the importance of non-ideal flow effects in the operation of industrial-scale adiabatic membrane reactors. Chemical Engineering Journal. 2001;83(2):95-105.

Liakos HH, Koukou MK, Markatos NC, Founti MA. Effects of pressure and impingement angle in flaming processes. The Canadian Journal of Chemical Engineering. 2000;78(4):834-841.

Koukou MK, Papayannakos N, Markatos NC, Bracht M, Van Veen HM, Roskam A. Performance of ceramic membranes at elevated pressure and temperature: effect of non-ideal flow conditions in a pilot scale membrane separator. Journal of membrane science. 1999;155(2):241-259.

Liakos HH, Koukou MK, Founti M. Modeling of impinging turbulent jets and premixed flames. Computational fluid dynamics'98. 1998:984-989.

Koukou MK, Papayannakos N, Markatos NC, Bracht M, Alderliesten PT. Simulation tools for the design of industrial-scale membrane reactors. Chemical Engineering Research and Design. 1998;76(8):911-920.

Koukou MK, Chaloulou G, Papayannakos N, Markatos NC. Mathematical modelling of the performance of non-isothermal membrane reactors. International journal of heat and mass transfer. 1997;40(10):2407-2417.

Bracht M, Alderliesten PT, Kloster R, Pruschek R, Haupt G, Xue E, Ross JRH, Koukou MK, Papayannakos N. Water gas shift membrane reactor for CO2 control in IGCC systems: techno-economic feasibility study. Energy conversion and Management. 1997;38:S159-S164.

Koukou MK, Papayannakos N, Markatos NC. Dispersion effects on membrane reactor performance. AIChE journal. 1996;42(9):2607-2615.