Keywords: vapour compression, vapour absorption, cascaded refrigeration systems, modified Gouy–Stodola law, exergy analysis, temperature, irreversible loss, coefficient of structural bonds
Exergy analysis of a vapour compression–absorption cascaded refrigeration system using modified Gouy–Stodola equation
In the present study, the performance of vapour compression-absorption cascaded refrigeration system (VCACRS) is studied with modified Gouy-Stodola equation and the results are compared with the classical approach of exergy evaluation. The quantitative difference in two approaches is presented which necessitates the need to employ modified approach. The expressions are formulated for effective temperature and real irreversible loss for different components of VCACRS. The overall performance of system can be improved by increasing the evaporator and generator temperature and by decreasing the absorber, cascade condenser and condenser temperature. Coefficient of structural bonds (CSB) analysis shows evaporator is relatively more sensitive to change in its temperature as compared with the other components.