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simulations conducted, they proposed a control strategy (for both air-cooled and water-cooled systems) on how to avoid crystallization of such systems. Maidment and Tozer (2001) carried out a theoretical analysis of the importance of using CHP systems in UK supermarkets. Their study showed that such projects could result in a payback period of less than seven years. They also found that it could offer significant primary energy/CO2 savings when compared with CHP schemes based upon gas boiler and coal-derived electricity. Aphornratana and Eames (1995) presented a second law thermodynamic analysis of a single effect AR cycle system. From their analysis, they found that the solution circulation ratio and the irreversibility associated with heat transfer in the evaporator played a significant role in determining the performance of the cycle. An increase in the circulation ratio resulted in an increase in the internal irreversibilities at the absorber and the generator, while an increase in solution heat exchanger effectiveness reduced the irreversibilities. However, an increase in effectiveness also increased the tendency of crystallization occurring in the system, which should be avoided. They therefore strongly proposed that in order to improve the cycle performance, the evaporator had to be considered first while the absorber might be considered second. They concluded that it was more thermodynamically efficient to operate absorption systems using low- temperature waste heat rather than high-temperature sources, due to the inherent crystallization problem associated with increasing the temperature of the generator. 68

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