Thermoeconomic Optimization of a Superheated Kalina Cycle for Various Geothermal Source Temperatures in Iran

Document Type : Original Article

Authors

1 Department of Mechanical Engineering, Center of Computational Energy, Hakim Sabzevari University, Sabzevar, Iran.

2 , Department of Mechanical Engineering, Center of Computational Energy, Hakim Sabzevari University, Sabzevar, Iran.

Abstract

Geothermal sources are one of the renewable heat sources. In the present study, at first, the feasibility of using a superheated Kalina cycle to generate power by geothermal sources in Iran has been investigated. Using thermodynamic and thermoeconomic analyses, the effect of operating parameters including turbine pressure and water-ammonia concentration on the performance of the superheated Kalina cycle at a heat source temperature of 170˚C has been investigated. The results show that at a heat source temperature of 170˚C and a concentration of 65%, the highest net power of cycle occurs at turbine pressure of 28.33 bar and the lowest exergy cost of power generation happens at the pressure of 19.44bar. Also, at a constant pressure of 22 bar, the maximum net power and minimum exergy cost of power generation occur at the concentration of 66% and 70.33%, respectively. Finally, minimizing the exergy cost of power generation was selected as the objective function and the values of turbine pressure and water-ammonia concentration were optimized simultaneously using a genetic algorithm. Eventually, in order to achieve maximum performance, for different temperatures of geothermal sources in Iran optimal values of pressure and concentration were introduced in a table.

Keywords

Main Subjects

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