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Performance study of water-ammonia absorption cycle having a heat recovery absorber (HRA) and economic analyses of the sources of energy, used to operate it, have been carried out to optimize its generator temperatures. Advantage of using the HRA has been shown through results of the system without HRA. A typical result reveals that, for the absorber-condenser temperatures of about 30°C and evaporator temperature equal to -25 °C, COP of the heat recovery system may increase upto 10%; while the operating cost, on the other hand, would get reduced to about 8-10%. The analyses has been repeated for a wide range of the operating conditions and the results, exhibited graphically.

Generator temperatures in the H2O-NH3, iNO3-NH3 and NaSCN-NH3 cycles, using iBr-H2O cycle at the first stager have een optimized corresponding to the minimum area and hence, the minimum cost of solar-collector required to operate two-stage dual-fluid cycles. Lowering the absorber temperature reduces heat input to the generator, lowers the generator temperature and improves performance of the absorption systems at the second stage. The optimum generator temperatures obtained for the given cycles are found to be in the working range for which the ordinary flat plate collectors, with two glass covers, are designed. The optimum generator temperature and the performance coefficients have been presented graphically.