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Bahram Saadatfar, Reza Fakhrai and Torsten Fransson, JMES Vol 2 Issue 1 2014 2.3.3 Combined power and cooling cycles A modified ammonia–water mixture combined power and cooling cycle was presented by Goswami [76] and is shown in Fig. 7 [77]. Vijayaraghavan and Goswami [78] proposed modified equations for both thermal and exergy efficiency based on a cascade analysis for cooling and power production. Also, Martin and Goswami [79] investigated a theoretical and experimental study of cooling production of cycle. The results indicated that it is possible to have cooling but high turbine efficiencies should be reached. Fig. 7 Schematic diagram of combined cooling and power cycle. a) Internal cooling source. b) external cooling source [77]. 2.3.4 Uehara cycle Different cycle for ocean thermal energy conversion (OTEC) studied by Uehara et al. [80,81]. They investigated the main components of an OTEC plant. The simulation results was done with 26C hot water and 4C cold water for 100MW OTEC system, and reported that R717 as one of the appropriate working fluid. The cycle is an improved Kalina cycle with adding second turbine, a heater and after condenser. A simple diagram of the Uehara cycle is shown in Fig. 8. The working fluid in Uehara cycle is ammonia-water mixture. The warm seawater heat up the mixture and turn into vapor-liquid mixture, then the vapor separated from liquid and sends to first turbine. After passing the heater the vapor directed to second turbine. The mixed vapor from the second turbine is absorbed with ammonia water in the absorber. The unabsorbed part is condensed to liquid by the cold seawater. 9PDF Image | Thermodynamic Vapor Cycles for Converting Low- to Medium-grade Heat to Power: A State-of-the- art Review and Future Research Pathways
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