Suction line heat exchanger is used for inner heat recovery with which heat is exchanged between condensed refrigerant liquid and evaporated refrigerant gas. In a general refrigeration system

inner heat recovery is helpful to increase cooling output

but it may lower the performance of vapor compressing refrigeration system sometimes also. In adsorption refrigeration cycle

inner heat recovery is beneficial to improve the cycle performance in terms of quantitative thermodynamic analysis. Although inner heat recovery decreases the cooling effect to adsorbent from evaporated gas

this does not offset the tendency of increasing cooling output. Some experimental data also verify that the precooler recovers some heat from the evaporated gas and help the evaporator to provide much more cooling capacity. Therefore

in adsorption refrigeration system

the precooler for inner heat recovery is an effective element to improve its performance

especially in the situation that condensing temperature is far higher than evaporating temperature.