Effect of Heat Exchanger influencing Coefficient of Performance of a Hermetic compressor

Compressor is one of the main parts and it is thus the first component of the refrigerator to be modeled. Compressor would consume less work when its inlet temperature is low which is understood from the T-S diagram as the constant pressure lines diverge towards right. The density decrease due to suction gas heating and mixing is a very important factor affecting mass flow rate, and can be characterized by a single parameter, the effectiveness of heat transfer driven by the difference between the temperature at the suction line and the discharge port. The present paper is to compare theoretical and experimental values and to develop an effective suction gas heat exchanger for hermetically sealed compressor. An attempt to achieve the required temperature with in less time when compared to the refrigeration unit working without heat exchanger had been done using laboratory set up with a single tube counter flow heat exchanger. The required temperature had been achieved with in 30 minutes when compared to the refrigeration unit working without heat exchanger. Though the actual COP values are much smaller compared to than Carnot COP values, it had been proved that the values obtained with heat exchanger is 10% more than the values with out Heat exchanger.