Optimum generator temperatures in four absorption cycles using different sources of energy

Abstract

Optimization of the generator temperatures in H 2ONH 3, LiNO 3NH 3, NaSCNNH 3 and LiBrH 2O absorption cycles for fixed values of the absorber, condenser, rectifier and evaporator temperatures have been done corresponding to minimum cost of the source of energy required to operate them. The sources of energy used for the study are biogas, liquefied petroleum gas (LPG) and solar collectors. The analysis is repeated for the four absorption cycles to operate in the air-conditioning mode and the three ammonia cycles in the refrigeration mode. A comparative study between the costs of the energies in the various cycles has also been done. Graphs depicting the optimum generator temperatures and the corresponding cooling and heating performance coefficients for a wide range of operating conditions have been prepared. Empirical equations for finding the heating values and costs of the energy sources have been presented. Relations for finding the concentration of ammonia in the vapour phase have been developed.