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Research Papers

Exergy, Economic, and Environmental Analysis of a PEM Fuel Cell Power System to Meet Electrical and Thermal Energy Needs of Residential Buildings

[+] Author and Article Information
G. R. Ashari, S. Shalbaf

 Islamic Azad University, Dezful Branch, Dezful, Khuzestan, 64611-77189, Iran

M. A. Ehyaei1

 Islamic Azad University, Pardis Branch, P.O. Box 16555/135, Pardis New City, Tehran, 13661-14677, Iranaliehyaei@yahoo.com

A. Mozafari

 Center of Excellence in Energy Conversion, Sharif University of Technology, P.O. Box 11155-9567, Tehran, 11155-9567, Iran

F. Atabi

 Islamic Azad University, Science and Research Branch, Tehran, 14778-93855, Iran

E. Hajidavalloo

 Mechanical Engineering Department, Shahid Chamran University, Ahvaz, Khuzestan, 64611-77189, Iran

1

Corresponding author.

J. Fuel Cell Sci. Technol 9(5), 051001 (Aug 17, 2012) (11 pages) doi:10.1115/1.4006049 History: Received April 03, 2011; Revised October 26, 2011; Published August 17, 2012; Online August 17, 2012

In this paper, a Polymer Electrolyte Membrane (PEM) fuel cell power system including burner, steam reformer, heat exchanger, and water heater has been considered. A PEM fuel cell system is designed to meet the electrical, domestic hot water, heating, and cooling loads of a residential building located in Tehran. Operating conditions of the system with consideration of the electricity cost has been studied. The cost includes social cost of the environmental pollutants (e.g. CO2 , CO and NO). The results show that the maximum energy needs of the building can be met by 12 fuel cell stacks with nominal capacity of 8.5 kW. Annual average electricity cost of thissystem is equal to 0.39 US$/kWh and entropy generation of this system through a year is equal to 1004.54 GJ/K1 . It is also concluded that increase in ambient temperature from 1 °C to 40 °C increases the entropy generation by 5.73%, carbon monoxide by 14.56%, and nitrogen monoxide by 8.9%, but decreases carbon dioxide by 0.47%.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 7

Variation of total entropy generation in one fuel cell stack with ambient air temperature

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Figure 8

Variation of total carbon monoxide production in one fuel cell stack with ambient temperature

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Figure 9

Variation of total nitrogen monoxide production in one fuel cell stack with ambient temperature

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Figure 10

Variation of carbon dioxide production in one fuel cell stack with ambient air temperature

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Figure 11

Variation of cost of electricity for one fuel cell stack with ambient air temperature

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Figure 6

Configuration of CHP fuel cell system

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Figure 5

Domestic hot water energy needs of the residential building

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Figure 4

The heating and cooling loads of the building, estimated on January 15, April 15, and July 15

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Figure 3

Total electrical power requirement of the residential building in a 24-h period, estimated for 15 July

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Figure 2

Total electrical power requirement of the residential building in a 24-h period, estimated for 15 January

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Figure 1

Ambient air dry-bulb and wet-bulb temperatures for Tehran, during the months of January, April, and July

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