An air conditioner using refrigerant-134a as the working fluid and operating on the ideal vapor-compression refrigeration cycle is to maintain the cold space at 20°C while operating its condenser at 1.2 MPa. Determine the (a) COP of the system when a temperature difference of 2°C is allowed between the evaporator and condenser. If the refrigerant leaves the compressor at 73°C at a rate of 4.85 kg/min, determine (b) the rate of heat rejection to the environment, in kW (c) the isentropic efficiency of the compressor, in % and (d) the compressor's power requirement, in kW. Disregard any heat loss in the expansion valve and compressor as well as the change in potential and kinetic energy of the refrigerant in any part of the cycle.

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Mechanisms of heat transfer

Heat transfer is an essential discipline in thermal engineering that deals with the transfer, conversion, usability, and creation of heat or thermal energy. Transfer of heat occurs through various mechanisms like conduction, convection, radiation, and change of phases. All these mechanisms have distinct characteristics, but these mechanisms can simultaneously occur in an identical system.