[01] N. Enadi, Abbaspour College of Technology, Shahid Beheshti University, Tehran, Iran. [02] M. Tahani, Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran. [03] P. Ahmadi, uel Cell Research Lab (FCReL), School of Mechatronic System Engineering, Simon Fraser University, Vancouver, Canada. [04] K. Rahmani, Abbaspour College of Technology, Shahid Beheshti University, Tehran, Iran. [05] K. Keramati, Automotive Department, Iran University of Science and Technology, Tehran, Iran. [06] T. Sokhansefat, Abbaspour College of Technology, Shahid Beheshti University, Tehran, Iran.

This research paper mainly deals with thermodynamic modeling, exergy analysis and optimization of a hybrid energy system consisting of a solar PV/T panel, PEM electrolysis, and a polymer electrolyte membrane (PEM) fuel cell and single effect Li-Br absorption chiller. Hydrogen is produced in this cycle using the electricity generated by PV/T panel and it is then stored in storage tank for later use at night when the sun is not available there. Hence, this hybrid cycle can be used during a day. In order to enhance understanding and to see how different design parameters affect the system performance, a comprehensive parametric study is conducted and the results are reported accordingly. The effects of fuel cell current density on system efficiency, work and heat, voltage of system and exergy losses in each component are investigated. In addition, a developed genetic algorithm optimization code is applied to determine the best optimal design parameters of the system where exergy efficiency and the total cost rate of the system are selected as two objective functions satisfying several reasonable constraints. The results show that the optimized value of total cost and the second low efficiency are 0.4149 and 0.271, respectively.

Absorption Chillers, Exergy, Fuel Cells, Hybrid System, Solar Energy Systems

[01] Barbir F. PEM fuel cells: theory and practice. Elsevier Science & Technology Books. 2005. [02] Larminie J and Dicks A. Fuel cell systems explained. 2nd ed. John Wiley & Sons Ltd. 2003. [03] Kaushik S.C, Ranjan K R and Panwar, N. L. Optimum exergy efficiency of single-effect ideal passive solar stills. Energy Efficiency, 2013; 6(3):595-606. [04] Ay, M., Midilli, A., Dincer, I., Exergetic performance analysis of a PEM fuel Cell. Int J Energy Res, 2006; 30(5):307-321. [05] Barclay F.J. Fundamental thermodynamics of fuel cell, engine, and combined heat and power system efficiencies. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 2002; 216(6):407-417. [06] Ghosh S and De S. Thermodynamic performance study of an integrated gasification fuel cell combined cycle: An energy analysis. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 2003; 217(6):575-581. [07] Lawn C.J. Technologies for tomorrow's electric power generation. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science December 1, 2009; 223:2717-2742. [08] Ahmadi P, Dincer I, Rosen M.A. Performance assessment and optimization of a novel integrated multigeneration system for residential buildings. 2013. Energy and Buildings 67, 568-578. [09] Yilanci A, Dincer I and Ozturk H.K. Performance analysis of a PEM fuel cell unit in a solar–hydrogen system, International Journal of Hydrogen Energy. 2008; 33(24):7538-7552. [10] Dupeyrat P, Ménézo C and Fortuin S. Study of the thermal and electrical performances of PVT solar hot water system. Energy and Buildings. 2012; 68:751-755. [11] Zhao P et al. Parametric analysis of a hybrid power system using organic Rankine cycle to recover waste heat from proton exchange membrane fuel cell. International Journal of Hydrogen Energy. 2011; 37(4):3382-3391. [12] Ratlamwala T.A.H, Gadall M.A and Dincer I. Performance assessment of an integrated PV/T and triple effect cooling system for hydrogen and cooling production. International Journal of Hydrogen Energy. 2011; 36(17):11282-11291. [13] Joshi, A et al. Performance evaluation of a hybrid photovoltaic thermal (PV/T) (glass-to-glass) system. International Journal of Thermal Sciences, 2009; 48:154-164. [14] Ahmadi P, Dincer I, Rosen M.A. Exergy, exergoeconomic and environmental analyses and evolutionary algorithm based multi-objective optimization of combined cycle power plants. Energy 36 (10), 5886-5898. [15] Yuan Z and Herold K.E. Thermodynamic Properties of Aqueous Lithium Bromide Using a Multiproperty Free Energy Correlation. HVAC and Research. 2005; 11(3):377-393. [16] Ahmadi P, Dincer I and Rosen M.A. Energy and exergy analyses of hydrogen production via solar-boosted ocean thermal energy conversion and PEM electrolysis. International Journal of Hydrogen Energy, 2013; 38(4):1795-1805. [17] Rosen M.A, Dincer I. and Kanoglu M. Role of exergy in increasing efficiency and sustainability and reducing environmental impact. Energy Policy, 2008; 36(1):128-37. [18] Szargut J, Morris D.R and Steward F.R. Exergy Analysis of Thermal, Chemical, and Metallurgical Processes. 1988, New York: Hemisphere Publishing Corporation. [19] Bejan A, Tsatsaronis G and Moran M. Thermal Design and Optimization. New York: Wiley. 1996. [20] Ioroi, T et al. Thin film electrocatalyst layer for unitized regenerative polymer electrolyte fuel cells. Journal of Power sources, 2002; 112:583-587.