Entropy Generation and Exergy Destruction in Compression and Absorption Refrigeration Systems: A Comparative Analysis.

Entropy generation minimization and exergy destruction minimization concepts are applied on various refrigeration systems. For comparative analyses, coefficients of performance, exergy destruction and entropy generation rates are found for refrigeration systems at same atmospheric conditions. They are also calculated for individual components of each refrigeration system and for various other systems. After analyses, 2.27 coefficient of performance is found for vapor compression refrigeration system, which is maximum among such systems. As maximum exergy destruction and entropy generation rates are obtained for compressor, i.e., 386.07 kJ/h and 1.288 kJ/h-K, minimum rates are found for evaporator. Maximum total destruction and generation rates are recorded for water cooling refrigeration system, but minimum total destruction and generation rates are estimated for vapor absorption refrigeration system. A comparison of both systems is done, and it is concluded that absorption system performs better on the basis of entropy generation and exergy destruction minimization theories (i.e., minimum 39.332 kJ/h and 0.131 kJ/h-K). It is also found that maximum destruction ratio (i.e., 0.999) is calculated for compressor, so irreversibilities or losses must be reduced by perfect designing of compressor. [ABSTRACT FROM AUTHOR]