Energy Saving R&D 2018-03-21T12:13:25+00:00

Energy Saving R&D

In cooperation with scientists and researchers and the research departments of the National Technical University of Athens (NTUA), the University of Patras, the School of Pedagogical & Technological Education, the Technical Educational Institute of Chalkis, the Aegean University and the Athens Observatory, a large number of publications related to the field of Energy Saving have been composed and issued.Our R&D department either by developing independent research projects or by participating in joint international research programs (HORIZON, INTERREG, EEA, MED, NSRF etc) aims at the improvement and development of procedures relating to:

  • Thermal behavior of building and structural elements
  • Phase Change Materials (PCM)
  • Thermal Storage
  • Cogeneration of Heat & Power
  • Renewable energy sources
  • Energy saving
  • Environment quality of interior spaces
a/a YEAR TITLE PUBLISHED / ANNOUNCED
50 2015 “Investigating the performance of a test phase change material chamber for passive solar applications: experimental and theoretical approach” (Vrachopoulos, M.Gr., M.K. Koukou, D.G. Stavlas, E.D. Kravvaritis, V.N. Stamatopoulos, A.F. Gonidis) International Journal of Sustainable Energy, Vol. 34, Is. 9, 2015
49 2013 Investigation of heat transfer in a triple-glazing type window at Greek climate conditions (M.Gr. Vrachopoulos, M.K. Koukou, G. Filos and C. Moraitis) Centr. Eur. J. Eng., 3(4) pp 750-763
48 2013 Investigating the performance of a test PCM chamber for passive solar applications: experimental and theoretical approach (M. Gr. Vrachopoulos, E. Kravvaritis, D. G. Stavlas, V. Stamatopoulos, A. Gonidis, and M. K. Koukou) International Journal of Sustainable Energy, DOI: 10.1080/14786451.2013.853065
47 2012 Residence site selection in urban and rural areas in Greece: A mul-tiple-criteria decision analysis approach (Thanos G., Vrachopoulos M.Gr., Koukou M.K., Koulis A., Kakouris A.P., Thanos A.G.) Int. J. Applied Management Science, Vol. 4, n. 1, 36-51
46 2012 Reflective insulation for improvement of  buildings energy efficiency (Vrachopoulos, M.Gr. M.K. Koukou, D.G. Stavlas, V.N. Stamatopoulos, A.F. Gonidis, E.D. Kravvaritis) Central European Journal of Engineering, Vol. 2 n. 1, 83-90
45 2012 “Testing reflective insulation for improvement of buildings energy efficiency” ( Vrachopoulos, M.Gr., M.K. Koukou, D.G. Stavlas, V.N. Stamatopoulos, A.F. Gonidis) Central European Journal of Engineering, Vol. 2, n. 1, σελ: 83-93, 2012.
44 2011 “Transientthree-Dimensional Numerical Solution of Night Ceiling Cooling Using PCM-Embedded Piping. Journal of Energy Engineering” (σε συνεργασία με K.A. Antonopoulos, C. Tzivanidis) Journal of Energy Engineering, 137(4), σελ: 177-186, 2011.
43 2011 “Enhancement of Solar Thermal Energy Storage using Phase Change Materials: an Experimental Study at Greek Climate Conditions” (σε συνεργασία με Vrachopoulos, M.Gr., M.K. Koukou, D.G. Stavlas, V.N. Stamatopoulos, A.F. Gonidis) International Review of Mechanical Engineering (IREME), Vol. 5, n. 2, σελ: 279-284, 2011.
42 2010 “Solar energy and Phase Change Materials (PCM) in buildings” (σε συνεργασία με τους K A Antonopoulos, C Tzivanidis) PV-Technology Development & Market-Trends, NTUA (Αθήνα, 4-5 Οκτ. 2010)
41 2010 Residence site selection in urban and rural environments in Greece: a multiple-criteria decision analysis approach (Thanos G., Vrachopoulos M.Gr., Koukou M.K., Kakouris A.P., and Thanos A.G.) “Quantitative Models in the Managerial and Financial Decision Making” Agios Nikolaos, Crete, Greece on 27th-29th May 2010.
40 2009 “Definition of horizontal geothermal heat exchanger behavior” (Vrachopoulos, M.Gr. and M.K. Koukou) 9th National Conference on Renewable Energy Sources, (organised by Institute of Solar Technology), 26-28/3/09, Pafos-Geroskipou, 2009.
39 2009 Vrachopoulos, M.Gr., M.K. Koukou, D. G. Stavlas, V. Stamatopoulos & A.G. Gonidis, “Energy storage in phase change materials (PCMs) – Measurement of thermophysical properties and evaluation of a PCM passive application”, 9th National Conference on Renewable Energy Sources, (organised by Institute of Solar Technology), Cyprus, 26-28/3/09, Pafos-Geroskipou, 2009.
38 2009 Vrachopoulos, M.Gr., M.K. Koukou, D. G. Stavlas, V. Stamatopoulos & A.G. Gonidis, “Evaluation of reflective insulation application in a prototype chamber in Greece: Experimental results for summer and winter periods”, 9th National Conference on Renewable Energy Sources, (organised by Institute of Solar Technology), Cyprus, 26-28/3/09, Pafos-Geroskipou, 2009.
37 2008 “Performance testing of reflective insulation applied in a prototype experimental chamber in Greece: experimental results for summer and winter period” (σε συνεργασία με M.Gr. Vrachopoulos, D.G. Stavlas, M.K. Koukou, N.W. Vlachakis, N.G. Orfanoudakis, S.A. Mavromatis & A.G. Gonidis) Heat Transfer, 2008
36 2008 Determination of the thermal and cooling needs of the broader region of Athens (Vrachopoulos, MG; Filios, AE; Fatsis, A; Mavrommatis, S) Renewable Energy, 2008, vol. 33, no. 12, pp. 2615-2622.
35 2008 Natural Cross-Ventilation in Buildings: Building-scale Experiments, Numerical Simulation and Thermal Comfort Evaluation (Stavrakakis, G.M., Koukou, M.K., Vrachopoulos, M.Gr., Markatos, N.C.) Energy & Buildings 40, 9, 1666-1681, (2008).
34 2008 Stavlas, D.G., Kravvaritis, L.D., Stamatopoulos, V., Vrachopoulos, M.Gr., Koukou M.K. and A.F. Gonidis, Evaluating the effectiveness of a prototype PCM chamber: An experimental and numerical approach, ECOS 2008, 21st International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, 24–27 June,  2008, Poland.
33 2008 Vrachopoulos, M.Gr., Stavlas, D.G., Kravvaritis, L.D., Koukou, M.K., Vlachakis, N.W., Orfanoudakis, N.W., Mavromatis S.A., Gonidis, A.G., Performance testing of reflective insulation applied in a prototype experimental chamber in Greece: experimental results for summer and winter period, Heat Transfer 2008, 10th International Conference on Advanced Computational Methods and Experimental Measurements in Heat Transfer, 9 – 11 July, 2008, Maribor, Slovenia
32 2008 Stavrakakis G., Markatos N.C., Koukou, M.K., Vrachopoulos, M.Gr., Experimental and Numerical Analysis of Natural Ventilation in Buildings, 6th GRACM International Congress on Computational Mechanics, Thessaloniki, Greece, 19-21 June 2008.
31 2008 Vrachopoulos, M.Gr., Kravvaritis, L.D., Stavlas, D.G., Stamatopoulos, V.N., Gonidis, A.F., A prototype experimental device for the determination of the stored heat of materials, HEFAT 2008, 6th Annual Heat Transfer, Fluid Mechanics and Thermodynamics Conference, University of Pretoria, Pretoria, South Africa, 30 June-2 July, 2008.
30 2007 “Incorporated Evaporative Condenser” (σε συνεργασία με Michalis Gr. Vrachopoulos, A. E. Filios, G. T. Kotsiovelos) Applied Thermal Engineering Vol.27, 2007, σελ: 823-828.
29 2007 Study of the natural convection phenomena inside a wall solar chimney with one wall adiabatic and one wall under a heat flux approach (Bacharoudis, E., Vrachopoulos, M.Gr., Koukou, M.K., Margaris, D., Filios, A.E., Mavrommatis, S.A.) Applied Thermal Engineering, 27, 2266–2275, (2007).
28 2007 Experimental measurements and theoretical predictions of flow field and temperature distribution inside a wall solar chimney (Papaefthimiou, V.D., Katsanos, C.O., Vrachopoulos, M.Gr., Filios, A.E., Koukou, M.K., Layrenti F.G) Proc. IMechE Vol. 221 Part C: J. Mechanical Engineering Science, 33-41, (2007).
27 2007 Thanos G., Vrachopoulos M.Gr., Kakouris A.P., Koukou M.K., Thanos A.G., A Decision Support System for the Ecological Selection Facility Location: A Multi-criteria Approach, IRMA 2007 International Conference, May 19-23, 2007, Vancouver, Canada.
26 2007 Stavrakakis G., Markatos N.C., Koukou, M.K., Vrachopoulos, M.Gr., Study of airflow pattern and thermal environment in naturally ventilated buildings, ENERTECH 2007, 2nd International Conference on Renewable Energy Sources and Energy Efficiency, Athens, 18-21 October, (2007).
25 2006 Numerical investigation of the buoyancy-induced flow field and heat transfer inside solar chimneys (Bacharoudis, E., Vrachopoulos, M.Gr., Koukou, M.K., Filios A.E.,) WSEAS Transactions on Heat and Mass Transfer, Issue 2, Vol. 1, 193-198, (2006).
24 2006 Experimental evaluation of the performance of reflective insulation for improvement of indoor thermal environmental conditions (Vrachopoulos, M.Gr., M.K. Koukou, G. Kotsiovelos, E. Kravvaritis, P. Ioannidou) WSEAS Transactions on Environment and Development, Issue 3, Vol. 2, 173-178, (2006).
23 2006 Bacharoudis, E., Vrachopoulos, M.Gr., Koukou, M.K., Filios A.E., Numerical investigation of the buoyancy-induced flow field and heat transfer inside solar chimneys, Int. Conference on Energy and Environmental Systems ‘06, Chalkida, Evia, 8-10 May, (2006).
22 2006 Vrachopoulos, M.Gr., M.K. Koukou, G. Kotsiovelos, E. Kravvaritis, P. Ioannidou, Experimental evaluation of the performance of reflective insulation for improvement of indoor thermal environmental conditions, Int. Conference on Energy and Environmental Systems ‘06, Chalkida, Evia, 8-10 May, (2006).
21 2005 ”Developing efficient tools to evaluate indoor environment issues: on-site measurements and numerical simulation of indoor air flow in a test room” (Vrachopoulos, M.Gr., M.K. Koukou, N.W. Vlachakis, N.G. Orfanoudakis, G. Thanos, A.E. Filios, J. Kaldelis) WSEAS Transactions on Environment and Development, Issue 2, Vol. 1, 288-293, (2005)
20 2005 Vrachopoulos, M.Gr., M.K. Koukou, N.W. Vlachakis, N.G. Orfanoudakis, G. Thanos, A.E. Filios, J. Kaldelis, ‘”Developing efficient tools to evaluate indoor environment issues: on-site measurements and numerical simulation of indoor air flow in a test room”, International Conference on Environment, Ecosystems, and Development, Venice, 2-4 November, (2005).
19 2005 Michalis D. Mentzos, Andronicos E. Filios, Dionisios P. Margaris, Evangelos Bacharoudis and Michalis Gr. Vrachopoulos « The Use of CFD for Flow Analysis and Performance Prediction of Centrifugal Pumps», South-eastern Europe fluent event 2005 11 – 13 May 2005, Porto Carras Grand Resort, Halkidiki, Greece
18 2005 “A 3D Simulation of Unsteady Flow inside Centrifugal Compressor Impellers” (A.Fatsis, N.G. Orfanoudakis, M. Vrachopoulos, A. Panoutsopoulou, N. Vlachakis) Int.Journal of Turbo_Jet_Engines, 2005.
17 2004 “Geothermal Low Enthalpy Exploitation of potential at Ierapetra Artificial Lake” (σε συνεργασία με τους Michael Gr. Vrachopoulos, Adamidis Ad., Kotsiovelos G., Kravvaritis El., Kravvaritis Kl., Stylianou St. & Savvanis  Pan.) International Conference Geothermal Energy Αpplications in Agriculture (Αθήνα, 3-4 Μαίου 2004)
16 2004 “Temperature Field Prediction around a Vertical Earth Heat Exchanger for Heating and Cooling Loads of Agro-tourist Buildings” (σε συνεργασία με τους Michael Gr. Vrachopoulos, Adamidis Ad., Kotsiovelos G., Kravvaritis El., Kravvaritis Kl., Stylianou St. & Savvanis  Pan.) International Conference Geothermal Energy Αpplications in Agriculture (Αθήνα, 3-4 Μαίου 2004)
15 2004 “Exploitation of Geothermal potential Aristinou” (σε συνεργασία με τους Michael Gr. Vrachopoulos, Adamidis Ad.,  Kotsiovelos G., Kravvaritis El., Kravvaritis Kl., Stylianou St. & Savvanis  Pan.) International Conference Geothermal Energy Αpplications in Agriculture (Αθήνα, 3-4 Μαίου 2004)
14 2004 Vrachopoulos M. Gr., Adamidis Ad., Kravvaritis El., Kotsiovelos G, Kravvaritis Kl., Stylianou St., and Savvanis  Pan. “Exploitation of Low Enthalpy Geothermal potential of Ierapetra Artificial Lake”, International Conference Geothermal Energy Applications in Agriculture, 3 – 4 May 2004, Athens, Greece
13 2004 Vrachopoulos M. Gr., Adamidis Ad., Kravvaritis El., Kotsiovelos G, Kravvaritis Kl., Stylianou St., and Savvanis  Pan. “Exploitation of Geothermal potential Aristinou”, International Conference Geothermal Energy Αpplications in Agriculture, 3 – 4 May 2004, Athens, Greece
12 2004 Vrachopoulos M. Gr., Adamidis Ad., Kravvaritis El., Kotsiovelos G, Kravvaritis Kl., Stylianou St., and Savvanis  Pan. “Temperature Field Prediction around a Vertical Earth Heat Exchanger for Heating and Cooling Loads of Agro-tourist Buildings”, International Conference Geothermal Energy Αpplications in Agriculture, 3 – 4 May 2004, Athens, Greece
11 2000 Vrachopoulos M.Gr., Kiritsis K.H., Filios A.E. and Tzivanidis C.N., “Regulation of Vertical Earth Heat Exchanger”, 8th International Energy Forum – ENERGEX 2000,Los Angeles
10 2000 Kiritsis K.H., Vrachopoulos M.Gr. and Filios A.E., “Off-Line Identification οf Solar Chimney”, 8th International Energy Forum – ENERGEX 2000,Los Angeles
9 1998 K.A.Αntonopoulos, M.Gr.Vrachopoulos and C.Tzivanidis. «Experimental Evaluation of Energy Savings in Air-Conditioning Using Metal Ceiling Panels», Applied Thermal Engineering Vol.18, pp.1129-1138, 1998.
8 1997 M.Gr.Vrachopoulos, A.S.Bifsas, S.K.Stilianou, and V.N.Goudoula. «The Optimum Exploitation of the Indigenous “Heat” of the Geological Substratum in Sousaki, Korinthos», release in EMES (Engineering of Modern Energy Systems) at May 30 – June 1, 1997, Oradea Romania
7 1997 K.A.Αntonopoulos, M.Gr.Vrachopoulos and C.Tzivanidis. «Experimental and theoretical studies of space cooling using ceiling-embedded piping Applied Thermal Engineering, Vol.17, No4, pp.351-367, 1997
6 1997 K.A.Αntonopoulos, C. Tzivanidis and M.Gr. Vrachopoulos, «Using orthogonal expansion of functions over multilayer walls for calculating the layer thermal properties», Applied Thermal Engineering, Vol.17, pp.193-201, 1997
5 1997 K.A.Αntonopoulos, M.Gr.Vrachopoulos. «The adjoint solution technique for the calculation of the thermal properties of layers in multilayer slabs under transient heat conduction», Int. Journal of Energy Research, Vol.21,pp.1261-1276, 1997
4 1996 K.A. Αntonopoulos, M.Gr. Vrachopoulos, «Analytical solution of the inverse unsteady wall heat conduction problem and experimental application», Int. Journal of Energy Research, Vol.20,pp.745-762, 1996
3 1996 K.A.Αntonopoulos, M.Gr.Vrachopoulos. «On-site experimental estimation of thermal conductivites and heat  capacities  in multilayer  walls under arbitrary  transient conditions using  explicit and  implicit finite- difference  schemes», Int. Journal of Energy Research, Vol.20, pp.17-32, 1996
2 1995 K.A.Αntonopoulos, M.Gr.Vrachopoulos. «On the inverse transient heat  transfer  problem  in  structural  elements  exposed   to  solar radiation», Renewable Energy, Vol. 6,  pp. 381-397, 1995.
1 1994 K.A.Αntonopoulos, F.Κ.Democritou, M.Gr.Vrachopoulos. «An experimental system   for   the  transient  non-periodic  thermal  analysis   of structural    elements Energy-The   International Journal, Vol. 19, pp. 383-395, 1994