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Sustainability 2014, 6(4), 1796-1820; doi:10.3390/su6041796
Article

Energy and Exergy Analyses of a New Combined Cycle for Producing Electricity and Desalinated Water Using Geothermal Energy

1
, 1,* , 1,2
 and 3
1 Faculty of Mechanical Engineering, University of Tabriz, Daneshgah Street, Tabriz 5166616471, Iran 2 Faculty of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil 5619911367, Iran 3 Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, 2000 Simcoe Street North, Oshawa, ON L1H 7K4, Canada
* Author to whom correspondence should be addressed.
Received: 1 January 2014 / Revised: 14 February 2014 / Accepted: 28 March 2014 / Published: 9 April 2014
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Abstract

A new combined cogeneration system for producing electrical power and pure water is proposed and analyzed from the viewpoints of thermodynamics and economics. The system uses geothermal energy as a heat source and consists of a Kalina cycle, a LiBr/H2O heat transformer and a water purification system. A parametric study is carried out in order to investigate the effects on system performance of the turbine inlet pressure and the evaporator exit temperature. For the proposed system, the first and second law efficiencies are found to be in the ranges of 16%–18.2% and 61.9%–69.1%, respectively. For a geothermal water stream with a mass flow rate of 89 kg/s and a temperature of 124 °C, the maximum production rate for pure water is found to be 0.367 kg/s.
Keywords: Geothermal energy; Kalina cycle; LiBr/H2O heat transformer; Thermodynamic analysis; Thermoeconomic analysis Geothermal energy; Kalina cycle; LiBr/H2O heat transformer; Thermodynamic analysis; Thermoeconomic analysis
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Akbari, M.; Mahmoudi, S.M.S.; Yari, M.; Rosen, M.A. Energy and Exergy Analyses of a New Combined Cycle for Producing Electricity and Desalinated Water Using Geothermal Energy. Sustainability 2014, 6, 1796-1820.

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