Abstract: There are two types of energy i.e. high grade energy and low grade energy. Majority of the processes require high grade energy which is depleting day by day. Hence, it has become a matter of great concern to use the non conventional source of energy or to recover the waste heat liberated from the processes. This paper studies theoretical approach to recover the waste heat liberated from vapour compression cycle, which is used to run vapour absorption cycle. The required heat has been given by solar energy. The work evaluated the performance of combined cooling cycle.