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International Journals

  1. Semi-empirical model of a multi-diaphragm pump in an Organic Rankine Cycle (ORC) experimental unit
    F.D'Amico, P.Pallis, A-D.Leontaritis, S.Karellas, N.M.Kakalis, S.Rech, A.Lazzaretto
    Energy, Vol. 143, 15 January 2018, pp. 1056-1071

  2. The potential of WHR/ batch and cullet pre-heating for energy efficiency in the EU ETS glass industry and the related energy incentives
    S. Karellas, D. Giannakopoulos, C-S Hatzilau, I.Dolianitis, G. Skarpetis, T.Zitounis,
    Energy Efficiency pp 1–15, December 2017.

  3. Experimental performance evaluation of a multi-diaphragm pump of a micro-ORC systemG. Carraro, P.Pallis, Α-D. Leontaritis, S. Karellas, P.Vourliotis, S. Recha, A.Lazzaretto
    IV Int. Seminar on ORC Power Systems, ORC2017, 13-15 September 2017, Milano, Italy
    Energy Procedia Vol. 129, September 2017, pp. 1018-1025

  4. Experimental Investigation and CFD Analysis of Heat Transfer in Single Phase Subcooler of a Small Scale Waste Heat Recovery ORC
    T.C.Roumpedakis, S.Chapaloglou, P.Pallis, Α-D. Leontaritis, K.Braimakis, S.Karellas, P.Vourliotis
    Energy Procedia, Vol. 129, September 2017, pp. 487-494

  5. Integrated thermoeconomic optimization of standard and regenerative ORC for different heat source types and capacities ,
    Braimakis K., Karellas S.
    Energy, Vol. 121, 15th February 2017, pp. 570-598.

  6. Water extraction from high moisture lignite by means of efficient integration of waste heat and water recovery technologies with flue gas pre-drying system,
    Han X.,Yan J.,Karellas S,Liu M.,Kakaras E.,Xiao F.
    Applied Thermal Engineering, Vol. 110, January 2017, pp. 442-456.

  7. Implementation of the Power to Methanol concept by using CO2 from lignite power plants: Techno-economic investigation,
    D.S. Kourkoumpas, E. Papadimou, K. Atsonios, S. Karellas, P. Grammelis, E. Kakaras
    International Journal of Hydrogen Energy, Vol.41, Issue 38, October 2016, pp. 16674-16687.

  8. Waste heat recovery at the glass industry with the intervention of batch and cullet preheating,
    Dolianitis I., Giannakopoulos D., Hatzilau C-S, Karellas S., Kakaras E., Nikolova E., Skarpetis G., Christodoulou N., Giannoulas N., Zitounis T.
    Thermal Science 2016, Vol. 20, Issue 4, February 2016, pp. 1245-1258.

  9. Numerical investigation of firing concepts for a flexible Greek lignite-fired power plant
    Drosatos, P., Nikolopoulos, N., Agraniotis, M., Kakaras, E.
    Fuel Processing Technology 142, Volume 142, February 2016, pp. 370-395.

  10. Exergetic comparison of CO2 capture techniques from solid fossil fuel power plants.
    K. Atsonios, K. D. Panopoulos, P. Grammelis, E. Kakaras
    International Journal of Greenhouse Gas Control Volume 45, February 2016, Pages 106–117 doi: 10.1016/j.ijggc.2015.12.022

  11. Energy-exergy analysis and economic investigation of a cogeneration and trigeneration ORC-VCC hybrid system utilizing biomass fuel and solar power
    S. Karellas, K. Braimakis
    Energy Conversion and Management, Volume 107, 1 January 2016, Pages 103–113

  12. Exergy analysis on solar thermal systems: A better understanding of their sustainability
    S. Kalogirou, S. Karellas, V. Badescu, K. Braimakis
    Renewable Energy, Volume 85, January 2016, Pages 1328–1333,

  13. Application of an advanced coupled EMMS-TFM model to a pilot scale CFB carbonator
    Zeneli, M., Nikolopoulos, A., Nikolopoulos, N., Grammelis, P., Kakaras, E.
    Chemical Engineering Science 138, December 2015, pp. 482-498

  14. Biomass fast pyrolysis energy balance of a 1kg/h test rig
    Atsonios, K., Panopoulos, K.D., Bridgwater, A.V., Kakaras, E.
    International Journal of Thermodynamics 18(4), December 2015 pp. 267-275.

  15. Pre-dried lignite technology implementation in partial load/low demand cases for flexibility enhancement
    K. Atsonios, I. Violidakis, K. Sfetsioris, D.C. Rakopoulos, P. Grammelis, E. Kakaras
    Energy 2015 doi: 10.1016/

  16. Combustion and Emissions in an HSDI Engine Running on Diesel or Vegetable Oil Base Fuel with n-Butanol or Diethyl Ether As a Fuel Extender
    D. C. Rakopoulos, C. D. Rakopoulos, R. Papagiannakis, E. Giakoumis, S. Karellas, G. Kosmadakis
    Journal of Energy Engineering, September 2015, DOI: 10.1061/(ASCE)EY.1943-7897.0000308

  17. Optimization of a log wood boiler through CFD simulation methods
    A. Nesiadis, N. Nikolopoulos, N. Margaritis, Grammelis P., Kakaras E.
    Fuel Processing Technology Volume 137, 1 September 2015, Pages 75-92

  18. Report on comparison among current industrial scale lignite drying technologies (A critical review of current technologies
    N. Nikolopoulos, I. Violidakis, E. Karampinis, M. Agraniotis, C. Bergins, P. Grammelis, Em. Kakaras
    Fuel Volume 155 ,2015, September 2015 Pages 86-114

  19. Investigation of the Natural Gas Quality in Greece
    Vourliotis, P., Pallis, P., Kalligeros, S., Kakaras, E.
    Energy Sources, Part A: Recovery, Utilization and Environmental Effects
    37 (19), September 2015, pp. 2073-2080

  20. Integration of calcium looping technology in existing cement plant for CO2 capture: Process modeling and technical considerations
    Atsonios, K., Grammelis, P., Antiohos, S.K., Nikolopoulos, N., Kakaras, E.
    Fuel Volume 153, 2015, August 2015 Pages 210-223

  21. Comparison of waste-to-energy processes by means of life cycle analysis principles regarding the global warming potential impact: Applied case studies in Greece, France and Germany”.
    Kourkoumpas, D.-S., Karellas, S., Kouloumoundras S., Koufodimos, G. Grammelis, P., Kakaras, E.
    Waste and Biomass Valorization Volume 6, Issue 4, August 2015, pp. 605-621

  22. Calcium looping process simulation based on an advanced thermodynamic model combined with CFD analysis.
    Atsonios, K. , Zeneli, M., Nikolopoulos, A., Nikolopoulos, N., Grammelis, P.,
    Kakaras, E.

    Fuel Volume 153, 1 August 2015, Article number 9080, Pages 371-381

  23. Low grade waste heat recovery with subcritical and supercritical Organic Rankine
    Cycle based on natural refrigerants and their binary mixtures
    K. Braimakis, M. Preißinger, D. Brüggemann, S. Karellas, K. Panopoulos
    Energy, 88, pp. 80-92, August 2015

  24. Comparison of Waste-to-Energy processes by means of Life Cycle Analysis Principles
    regarding the Global Warming Potential Impact: Applied Case Studies in Greece, France and Germany
    D.-S. Kourkoumpas, S. Karellas, S. Kouloumoundras, G. Koufodimos, P. Grammelis, E. Kakaras
    Waste and Biomass Valorization, Springer, April 2015, DOI 10.1007/s12649-015-9367-2

  25. Detailed transient thermal simulation of a planar SOFC (solid oxide fuel cell) using gPROMS™
    D.P. Xenos, P.Hofmann, K.D.Panopoulos, E.Kakaras
    Energy, Volume 81, Pages 84-102, 1 March 2015

  26. Alternative thermochemical routes for aviation biofuels via alcohols synthesis: Process modeling, techno-economic assessment and comparison
    K.Atsonios, M-A Kougioumtzis, K.D.Panopoulos, E.Kakaras
    Applied Energy, Volume 138, Pages 346-366, 5 January 2015

  27. Modelling and assessment of acid gas removal processes in coal-derived SNG production
    E.-I. Koytsoumpa, K. Atsonios, K.D. Panopoulos, S. Karellas, E. Kakaras, J. Karl
    Applied Thermal Engineering, Volume 74, Pages 128-135, 5 January 2015

  28. Thermodynamic analysis and comparison of retrofitting pre-drying concepts at existing lignite power plants
    K.Atsonios, I.Violidakis, M.Agraniotis, P.Grammelis, N.Nikolopoulos, E.Kakaras
    Applied Thermal Engineering, Volume 74, Pages 165-173, 5 January 2015

  29. New power production options for biomass and cogeneration”
    Karampinis, E., Kourkoumpas, D.-S., Grammelis, P., Kakaras, E.
    Wiley Interdisciplinary Reviews: Energy and Environment
    4 (6), pp. 471-485, 2015.

  30. A small power recovery expander for heat pump COP improvement
    G. Ferrara, L. Ferrari, D. Fiaschi, G. Galoppi, S. Karellas, R. Secchi, D. Tempesti,
    69th Conference of the Italian Thermal Machines Engineering Association, ATI2014
    Energy Procedia 81 ( 2015 ) 1151 – 1159

  31. Agglomeration problems during cardoon fluidized bed gasification
    C. Christodoulou, E. I. Koytsoumpa, K.-D. Panopoulos, S. Karellas, E. Kakaras
    Thermal Science, Volume 18, Issue 2, Pages 645-656, 2014

  32. Circulating fluidized bed gasification of 1st and 2nd generation biofuel seed cakes after oil extraction
    C. Christodoulou, D. Grimekis, K.-D. Panopoulos, D. Vamvuka, S. Karellas, E. Kakaras
    FUEL, 132, pp. 71-81, 15 September 2014

  33. Economic evaluation of decentralized pyrolysis for the production of bio-oil as an energy carrier for improved logistics towards a large centralized gasification plant
    K. Braimakis, K. Atsonios, K. D. Panopoulos, S. Karellas, E. Kakaras
    Renewable and Sustainable Energy Reviews, 35, pp. 57-72, July 2014

  34. A decoupled approach for NOx – N2O 3-D modeling in CFB plants
    A. Nikolopoulos, I. Malgarinos, N. Nikolopoulos, P. Grammelis, S. Karellas, E. Kakaras
    Fuel, 115, pp. 401-415, January 2014

  35. Comparison of the performance of compressed-air and hydrogen energy storage
    systems. Karpathos island case study
    S. Karellas, N. Tzouganatos
    Renewable and Sustainable Energy Reviews, 29, 865–882, January 2014

  36. Energetic and Exergetic analysis of waste heat recovery systems in the cement industry
    S. Karellas, A.-D. Leontaritis, G. Panousis, E. Bellos, E. Kakaras
    Energy 58, pp. 147-156, September 2013

  37. Ιnvestigation of proper modeling of very dense granular flows in the recirculation system of CFBs
    Α. Nikolopoulos, N. Nikolopoulos, N. Varveris, S. Karellas, E. Kakaras
    Particuology 10 (6), pp. 699-709, December 2012

  38. Numerical investigation on the application of a lignite pre-drying concept in an existing Greek power plant
    M. Agraniotis, S. Karellas, I. Violidakis, A. Doukelis, P. Grammelis, E. Kakaras
    Thermal Science, doi: 10.2298/TSCI110509120A

  39. Investigation of technical and economic aspects of pre-dried lignite utilisation in a modern lignite power plant toward zero CO2 emissions
    M. Agraniotis, A. Koumanakos, A. Doukelis, S. Karellas, E. Kakaras
    Energy, 45 (1), pp. 134-141, September 2012

  40. An evaluation of Substitute Natural Gas production from different coal gasification processes based on modeling
    S. Karellas, K.D. Panopoulos, G. Panousis, A.A. Rigas, J. Karl, E. Kakaras
    Energy, 45 (1), pp. 183-194, September 2012

  41. Integrated system Approach for increase of engine combined cycle efficiency
    D. Gewald, S. Karellas, A. Schuster, H. Spliethoff
    Energy Conversion and Management, 60, pp. 36-44, August 2012

  42. Waste heat recovery from a landfill gas-fired power plant
    D. Gewald, K. Siokos, S. Karellas, H. Spliethoff
    Renewable and Sustainable Energy Reviews, 16,4, pp. 1779-1789, May 2012

  43. The Solid Recovered Fuel Stabilat®: characteristics and fluidised bed gasification tests
    G. Dunnu, K. D. Panopoulos, S. Karellas, J. Maier, S. Touliou, G. Koufodimos, I. Boukis, E. Kakaras
    FUEL 2013, doi: 10.1016/j.fuel.2011.08.061, pages 273-283 March 2012

  44. Influence of Supercritical ORC parameters on plate Heat Exchanger Design
    S. Karellas, A. Schuster, A.-D. Leontaritis
    Applied Thermal Engineering, 33-34, February 2012, pp. 70-76

  45. Numerical investigation of the grid spatial resolution and the anisotropic character of EMMS in CFB multiphase flow
    K. Atsonios, A. Nikolopoulos, S. Karellas, N. Nikolopoulos, P. Grammelis, E. Kakaras
    Chemical Engineering Science, 66, 17, September 2011, pp. 3979-3990

  46. Tar analysis from biomass gasification by means of online fluorescence spectroscopy
    C. Baumhakl, S. Karellas
    Optics and Lasers in Engineering, 49, 7, July 2011, pp. 885-891

  47. Ash properties and environmental impact of various biomass and coal fuels and their blends
    D. Vamvuka, E. Kakaras
    Fuel Processing Technology, 92, 3, March 2011, pp. 570-581

  48. Investigation of an autonomous hybrid solar thermal ORC–PV RO desalination system. The Chalki island case
    S.Karellas, K.Terzis, D. Manolakos
    Renewable Energy, 36, 2, February 2011, pp. 583-590

  49. Numerical investigation of the oxy-fuel combustion in large scale boilers adopting the ECO-Scrub technology
    N. Nikolopoulos, A. Nikolopoulos, E.Karampinis, P.Grammelis, E. Kakaras
    Fuel, 90, 1, January 2011, pp. 198-214

  50. Dry lignite co-firing in a Greek utility boiler: Experimental activities and numerical simulations
    M. Agraniotis, D. Stamatis, P. Grammelis, E. Kakaras
    Energy and Fuels, 24, 10, 2010, pp. 5464–5473

  51. The outcomes of the 2-decade monthly monitoring of fly ash-composition in a lignite-fired power station
    G. Itskos, S. Itskos, A. Moutsatsou, C. Vasilatos, N. Koukouzas, E. Kakaras
    Waste and Biomass Valorization, 1, 4, 2010, pages 431-437

  52. An advanced EMMS scheme for the prediction of the drag coefficient acting on solid particles under a 1.2 MWth CFBC isothermal flow – Part II, Numerical Implementation.
    A. Nikolopoulos, K. Atsonios, N. Nikolopoulos, P. Grammelis, E. Kakaras. Chemical Engineering Science, 65, 2010, pp. 4089-4099.

  53. An advanced EMMSscheme for the prediction of drag coefficient under a 1.2 MWth CFBC isothermal flow – Part I, Numerical Formulation
    A. Nikolopoulos, P. Grammelis, E. Kakaras
    Chemical Engineering Science, 65, 2010, pp.4080-4088

  54. Numerical investigation of Solid Recovered Fuels’ co-firing with brown coal in large scale boilers – Evaluation of different co-combustion modes
    M. Agraniotis, N. Nikolopoulos, A. Nikolopoulos, P. Grammelis, E. Kakaras
    Fuel, 89, 12, December 2010, pp.3693-3709

  55. Investigation of the performance and emissions of bus engine operating on butanol/diesel fuel blends”.
    D.C. Rakopoulos, C.D. Rakopoulos, D.T. Hountalas, E.C. Kakaras, E.G. Giakoumis, R.G. Papagiannakis
    Fuel, 89, 10, October 2010, pp.2781-2790

  56. Development of an investment decision tool for biogas production from agricultural waste
    S. Karellas, I.Boukis, G. Kontopoulos.
    Renewable and Sustainable Energy Reviews, 14, 4, May 2010, pp. 1273-1282

  57. Design and exergetic analysis of a novel carbon free tri-generation system for hydrogen, power and heat production from natural gas, based on combined solid oxide fuel and electrolyser cells
    N. Perdikaris, K.D. Panopoulos, Ph. Hofmann, S. Spyrakis, E. Kakaras
    International Journal of Hydrogen Energy, 35 (6), March 2010, pp.2446-2456

  58. Efficiency optimization potential in supercritical Organic Rankine Cycles
    A. Schuster, S. Karellas, R. Aumann
    Energy, 35, February 2010, pp.1033-1039

  59. Co-firing Solid Recovered Fuels (SRF) with brown coal in large scale pulverised fuel power plants – A simulation approach.
    M. Agraniotis, P. Grammelis, E. Kakaras.
    International Journal of Global Warming, Vol. 1, Nos. 1/2/3, 2009, pp.106-128

  60. CO2 and SO2 capture capability of two Greek limestones during repeated thermal cycles
    P. Basinas, P. Grammelis, J. R. Grace, C. J. Lim, G. Skodras, E. Kakaras, G. P. Sakellaropoulos
    International Journal of Global Warming, Vol. 1, Nos. 1/2/3, 2009, pp.270-287

  61. Optimization of computational performance and accuracy in 3-D transient CFD model for CFB hydrodynamics predictions
    I. Rampidis, A. Nikolopoulos, N. Koukouzas, P. Grammelis, E. Kakaras,
    Journal of Numerical Analysis, Industrial and Applied Mathematics (JNAIAM), 936, 2009, pp. 452-455

  62. A thermochemical conversion study on the combustion of residue derived fuels
    G. Skodras, P. Grammelis, P. Basinas, M. Prokopidou, E. Kakaras, G.P. Sakellaropoulos
    Water, Air and Soil Pollution Journal (WASP), Focus (2009), pp. 151-157

    Synthesis, Modeling and Exergy Analysis of Atmospheric Air Blown Biomass.
  63. Gasification for Fischer-Tropsch Process
    S. Spyrakis, K.D. Panopoulos, E. Kakaras
    International Journal of Thermodynamics, 12, 4, December 2009, pp.187-192

  64. Comparison between two methane reforming models applied to a quasi-two-dimensional planar solid oxide fuel cell model
    Ph. Hofmann, K.D. Panopoulos, L.E. Fryda, E. Kakaras
    Energy, 34, 12, December 2009, pp.2151-2157

  65. Partial O2-fired coal power plant with Post-combustion CO2 capture: A retrofitting option for CO2 capture ready plants.
    Doukelis, I. Vorrias, P. Grammelis, E. Kakaras, M. Whitehouse, G. Riley
    FUEL, 88, 12, December 2009, pp.2428-2436

  66. Numerical investigation on the combustion behaviour of pre dried Greek lignite
    M. Agraniotis, D. Stamatis, P. Grammelis, E. Kakaras
    Fuel, 88,12, December 2009, pp.2385-2391

  67. Experimental investigation on the combustion behaviour of pre-dried Greek lignite
    M. Agraniotis, P. Grammelis, Ch. Papapavlou E. Kakaras
    Fuel Processing Technology, 90, 9, September 2009, pp.1071-1079

  68. Design and optimization of carbon-free power generation based on coal hydrogasification integrated with SOFC
    N. Perdikaris, K.D. Panopoulos, L. Fryda, E. Kakaras
    FUEL, 88,8, August 2009, pp.1365-1375

  69. Chemical, leaching and toxicity characteristics of CFB combustion residues
    G. Skodras, P. Grammelis, M. Prokopidou, E. Kakaras, G. Sakellaropoulos
    Fuel 88, 7, August 2009, pp.1201–1209

  70. Energetic and economic investigation of Organic Rankine Cycle
    A. Schuster, S. Karellas, E. Kakaras, H. Spliethoff
    Applied Thermal Engineering, 29, June 2009, pp.1809-1817

  71. Policy plan for the use of biomass and biofuels in Greece, Part I: Available biomass and methodology
    I. Boukis, N. Vassilakos, G. Kontopoulos, S. Karellas
    Renewable and Sustainable Energy Reviews, 13, June 2009, pp.971-985

  72. Policy plan for the use of biomass and biofuels in Greece, Part II: Logistics and economic investigation
    I. Boukis, N. Vassilakos, G. Kontopoulos, S. Karellas
    Renewable and Sustainable Energy Reviews, 13, May 2009, pp.703-720

  73. Conversion of Syngas from Biomass in Solid Oxide Fuel Cells
    J. Karl, N. Frank, S. Karellas, M. Saule, U. Hohenwarter
    Journal of Fuel Cell Science and Technology, 6, May 2009, pp.0210051-0210056

  74. The Energy Policy of the Republic of Cyprus
    P.A. Pilavachi, M.K. Kakouris, N.G. Kalampalikas, E. Kakaras, D. Giannakopoulos
    Energy,34,5, May 2009, pp.547-554

  75. Air-blown biomass gasification combined cycles (BGCC): System analysis and economic assessment
    P. Klimantos, N. Koukouzas, A. Katsiadakis, E. Kakaras
    Energy, 34, 5, May 2009, pp.708-714

  76. Comparative techno-economic analysis of ORC and gasification for bioenergy applications
    A. Rentizelas, S. Karellas, E. Kakaras, I. Tatsiopoulos
    Energy Conversion and Management, 50, 3, March 2009, pp.674-681

  77. Techno-economic analysis of the energy exploitation of biomass residues in Heraklion Prefecture-Crete
    I. Boukis, N. Vassilakos, S. Karellas, E. Kakaras
    Renewable and Sustainable Energy Reviews, 13, 2, February 2009, pp.362-377