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

Sustainability

Mehri Akbari¹  Seyed M. S. Mahmoudi¹  Mortaza Yari¹ 

[1]Faculty of Mechanical Engineering, University of Tabriz, Daneshgah Street, Tabriz 5166616471, Iran

[2] E-Mails:

关键词: Geothermal energy;    Kalina cycle;    LiBr/H₂O heat transformer;    Thermodynamic analysis;    Thermoeconomic analysis;   

DOI  :  10.3390/su6041796

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.