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Session: Poster Session and Sponsors Exhibition
Session starts: Thursday 22 September, 14:00

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Mohammad Mehdi Rashidi (Bu-Ali Sina university)
Nicolas Galanis (Université de Sherbrooke, Sherbrooke, QC)
Amin Habibzadeh (Bu-Ali Sina university)

Abstract:
In this paper a power and cooling cycle which combines the organic Rankine cycle (ORC) and the ejector refrigeration cycle supplied by geothermal heat energy sources is analyzed. The thermodynamic and physical properties of thirteen working fluids, including wet, dry and isentropic fluids are investigated in the proposed combined cycle, and their performances are compared. With a fixed power/refrigeration ratio, the effects of the various operating conditions on the cycle performance are examined. The proposed model is validated with the results of the combined power and ejector refrigeration cycle using R245fa as the working fluid presented by Zheng et al. [1] and Hasan et al. [2]. Also it is validated with the results of Dai et al. [3] in which R123 was selected as the working fluid. The main conclusions from this study are as follows: 1- The results confirm the thermodynamic superiority of dry and isentropic ORC fluids over the wet fluids. 2- Exergy efficiency decreases with increasing evaporator temperature but increases with decreasing turbine inlet temperature and increasing heat source temperature. 3- Thermal efficiency increases with the increase in the turbine inlet temperature and expansion ratio of the turbine. 4- Entrainment ratio of the ejector decreases as the evaporator temperature rises.