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Abstract
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Thermodynamic feasibility evaluation is investigated for a salinity gradient solar pond-based power generation
system. A dual-pressure evaporation organic Rankine cycle using the zeotropic mixture as working fluid is
employed for power generation. To increase power generation, liquefied natural gas cold energy is used as a heat
sink. Furthermore, to reach reliable results, transient analysis is conducted on the overall system. Also, the solar
pond walls shading effect as well as heat losses that could not be ignored (i.e., evaporation heat loss from pond
surface) is considered in the simulation. The results show that for a system located in Urmia, Iran, the annual
average solar pond energy efficiency for the first year is obtained 20%. Different zeotropic mixtures are examined
to achieve the optimal thermal performance of the system. It is concluded that the system using R245ca/R236ea
with a mass fraction of 0.6/0.4 has the optimal thermal performance among selected zeotropic mixtures. In this
case, the values of the system generated power and exergy destruction are obtained 95.67 MJ year 1 m 2 and
133.7 MJ year 1 m 2, respectively, with an energy efficiency of 3.28%.
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