摘要
This work investigates the impact of varying the evaporator load on the performance and parameter characteristics of a heat pump.A series of experiments have been done on a vapor compression cycle heat pump which is run with R134a.The evaporator in this system is a coil submerged in a water/glycol bath accommodated in a thermally insulated steel container.The load of the evaporator is changed through a heater in this bath with a capacity of 1.8 kW.The glycol bath is mixed through an electric stirrer.The results showed that system pressures and temperatures generally increase and then decrease after a certain heat load has been imposed.The same trend is for COP of the refrigeration system;hence there is an optimum load point to which the COP increases to a maximum and then starts to decline.This optimum point corresponds to the best efficiency of the system.
