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a weak function of the critical temperature. Their findings also agree with that of Vaja and Gambarotta (2010), who concluded that the thermal efficiency was lower for working fluids with lower critical temperature. They confirmed that the maximum value of total heat recovery efficiency occurred at the appropriate evaporating temperature which lay between the inlet temperature of waste heat and the condensing temperature. They also found that the maximum value of total heat recovery efficiency increased with the inlet temperature of the waste heat; however, it could be decreased when a working fluid with lower critical temperature was used. Hung et al. (2010) performed a study to investigate the suitability of 11 different organic working fluids for an ORC system used for the recovery of low-grade waste heat from a solar pond or an ocean thermal energy conversion (OTEC) system. They calculated the efficiency of the ORC system based on the assumption that the working fluid entered the turbine as saturated vapour. They found that the three factors of the fluid which had a major impact on the system performance of an ORC were the slope of the saturation curve, the specific heat, and the latent heat. They concluded that wet fluids with very steep saturated vapour curves in T-s diagram had a better overall performance in energy conversion efficiencies than that of dry fluids. Wang and Zhao (2009) investigated the performance of a low-temperature solar-powered ORC system, using three different zeotropic compositions of organic fluid R245fa/R152a. They assumed that due to the inherent temperature glide associated with zeotropic mixtures during phase change, 37PDF Image | OPTIMISING THERMAL ENERGY RECOVERY
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