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Rico. They concluded that the results of the thermodynamic properties for the air-cooled absorption cycle were very close to those with cooling towers, especially during periods of high solar radiation. Also, the COP was found to decrease as the ambient temperature increased. Kim and Ferreira (2009) investigated theoretically the performance of an air- cooled H2O.LiBr AC to be combined with low-cost flat solar collector for solar air conditioning in extremely hot and dry regions. They used a dilute H2O.LiBr solution to avoid the risk of crystallization even in extremely hot weather conditions. The results of their simulation showed that chillers would deliver water of around 7oC with a COP of 0.37 from 90oC hot water under ambient conditions of 35oC. However, as the ambient temperature climbed to 50oC, the chillers retained about 36% of the cooling power achieved at 35oC ambient. Vega et al. (2006) investigated the performance of H2O.LiBr ACs operating with plate heat exchangers (PHE). They found that the use of PHE in the generator, condenser and solution heat exchanger gave a higher chilling capacity to volume ratio. They also found a COP as high as 0.8 when the ambient temperature was as low as 20oC. At higher ambient temperatures of more than 30oC, the COP was found to be 0.75; however, this occurred at the expense of higher heating temperature. Kaynakli and Yamankaradeniz (2007) carried out thermodynamic analysis of a H2O.LiBr AR system based on entropy generation through modelling and simulation. They evaluated variations in entropy generation and non- dimensional entropy generation in each component under different operating 70PDF Image | OPTIMISING THERMAL ENERGY RECOVERY
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