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One manner to be used to increase refregration effect is by flowing hot refrigerant out from condensor, it is then touched with the refrigerant out from evaporator on a heat exchanger of counterflow type. Experiment was done by taking samples of pressure at suction (p1) and discharge (p2) of compressor and box temperature (Tr1, Tr2, Tr3, Tr4). By knowing of pressure at suction (p1), the enthalpy into compressor is known. By assuming the process is isentropic (compressor), isobar (condenser anddoaj:110487e653f044449f1fcfb328ff9426 fatcat:ouacy6ulpbbmvobbu4efxqqjma