An air conditioning unit uses Freon (R-22) to adapt an office room at temperature 25 oC in the summer, if the temperature of the evaporator is 16 oC and of the condenser is 48 oC. The reciprocating compressor is single acting, number of cylinders are 2, the volumetric efficiency is 0.9, number of revolutions are 900 r.p.m. and L\D= 1.25. If the compressor consumes a power of 3 kW and its mechanical efficiency is 0.9. Find the following:  (A) Flow rate of the refrigerant per minute.  (B) Refrigeration capacity for the unit in tons of refrigeration. (C) Dimensions of the compressor cylinder. (D) Condenser heat load.  (E) Coefficient of performance and relative efficiency.

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Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.