Selection and Exergy Analysis of Fuel Cell System to Meet all Energy Needs of Residential Buildings

Authors: G.R. Ashari, N.Hedayat, S. Shalbaf, E.Hajidavalloo

Abstract:

In this paper a polymer electrolyte membrane (PEM) fuel cell power system including burner, steam reformer, heat exchanger and water heater has been considered to meet the electrical, heating, cooling and domestic hot water loads of residential building which in Tehran. The system uses natural gas as fuel and works in CHP mode. Design and operating conditions of a PEM fuel cell system is considered in this study. The energy requirements of residential building and the number of fuel cell stacks to meet them have been estimated. The method involved exergy analysis and entropy generation thorough the months of the year. Results show that all the energy needs of the building can be met with 12 fuel cell stacks at a nominal capacity of 8.5 kW. Exergy analysis of the CHP system shows that the increase in the ambient air temperature from 1oC to 40oC, will have an increase of entropy generation by 5.73%.Maximum entropy generates for 15 hour in 15th of June and 15th of July is estimated to amount at 12624 (kW/K). Entropy generation of this system through a year is estimated to amount to 1004.54 GJ/k.year.

Keywords: CHP mode, entropy, exergy, no of fuel cell stacks.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1062460

References:

[1] M.A. Rosen, N.M. Lee, and I. Dincer, "Efficiency analysis of a cogeneration and district energy system", Applied Thermal Engineering, vol. 25, pp. 147-159, 2005.
[2] J.L. Silveira, A.C.S. Walter, C.A. Luengo, "A case study of compact cogeneration using various fuels", Fuel, vol. 76, pp. 447-451, 1997.
[3] M.A. Ehyaei, M.N. Bahadori, "Selection of micro turbines to meet electrical and thermal energy needs of residential buildings in Iran", Energy & Buildings, vol. 39, pp. 1227-1234, 2006.
[4] M.A. Ehyaei, A. Mozafari, "Energy, economic and environmental (3E) analysis of a micro gas turbine employed for on-site combined heat and power production", Energy and Buildings, vol.42, pp. 259-264, 2010.
[5] M.H. Saidi, M.A. Ehyaei, A. Abbasi, "Optimization of a combined heat and power PEFC by exergy analysis", Journal of Power Sources, vol. 143, pp. 179-184, 2005.
[6] M.H. Saidi, M.A. Ehyaei, A. Abbasi, "Exergetic optimization of a PEM fuel cell for domestic hot water heater", ASME journal of fuel cell technology 2, pp. 284-289, 2005.
[7] C.J. Renedo, A. Ortiz, M. Monana, D. Silio, S. Perez, "Study of different cogeneration alternatives for Spanish hospital center", Energy and Buildings, vol. 38, pp. 484-490, 2006.
[8] K.H. Khan, M.G. Rasul, M.M.K. Khan "Energy conservation in buildings: cogeneration and cogeneration coupled with thermal energy storage", Applied Energy, vol. 7, pp. 15-34, 2004.
[9] M. Dentice, D. Accadia, M. Sasso, "Micro-combined heat and power in residential and light commericial applications" Applied Thermal Engineering, vol. 23, pp. 1247-1259, 2003.
[10] J.L. Miguez, S. Murillo, J. Porteiro J, "Feasibility of a new domestic CHP tri generation with heat pump: I. Design development", Applied Thermal Engineering, vol. 24, pp. 1409-1419, 2004.
[11] J.L. Miguez, S. Murillo, J. Porteiro J, "Feasibility of a new domestic CHP tri generation with heat pump: II. Availability analysis", Applied Thermal Engineering, vol.24, pp. 1421-1429, 2004.
[12] G. Gigliucci , L. Petruzzi , E. Cerelli, "Demonstration of a residential CHP system based on PEM fuel cells", Journal of Power Sources, vol. 131, pp. 62-68, 2004.
[13] X.Q. Kong, R.Z. Wang, X.H. Huang, "Energy efficiency and economic feasibility of CCHP driven by sterling engine", Energy Conversion and Management, vol.45, pp. 1433-1442, 2004.
[14] K.M. Maribu, R. Firestone , C. Marnay, A.S. Siddiqui, "Distributed energy resources market diffusion model", Energy Policy, vol. 35, pp. 4471-4484, 2007.
[15] G.G. Maidment, R.M. Tozer, "Combined cooling heat and power in supermarkets", Applied Thermal Engineering, vol. 22, pp. 653-665, 2002.
[16] D. Ziher, A. Poredos, "Economics of a three-generation system in a hospital", Applied Thermal Engineering, vol. 26, pp. 680-687, 2006.
[17] E. Cardona, P.Sannino, A.Piacentino, F.Cardona, "Energy saving in airports by three-generation. Part II: Short and long term planning for the Malpensa 2000 CHCP plant", Applied Thermal Engineering, vol. 26, pp. 1437-1447, 2006.
[18] A. Bejan, Advanced Engineering Thermodynamics. New York: John Wiley & Sons, 1988.
[19] A. Mozafari, and A. Ahmadi and M.A. Ehyaei, "Optimization of micro gas turbine by exergy, economic and environmental (3E) analysis", IJ Exergy, vol. 7, pp. 1-19, 2010.