CONDENSERS

CONDENSERS . Esma Khatun 20/08/2016 1. Introduction CONDENSERS and evaporators are basically heat exchangers in which the refrigerant undergoes a phase change. In CONDENSERS the refrigerant vapor condenses by rejecting heat to an external fluid, which acts as a heat sink. In evaporators, the liquid refrigerant evaporates by extracting heat from an external fluid (low temperature heat source). 2. Thermodynamic analysis of the system At point 1 in the diagram, the circulating refrigerant enters the compressor in a saturated state. From point 1 to point 2, the refrigerant is isentropically compressed ( , compressed at constant entropy) and exits the compressor in a superheated state. The process 2-3' is a de-superheating process. Process 3'-3 is the condensation process.

10 Analysis of condensers The total heat rejected in the condenser, QC is given by: m is the mass flow rate of refrigerant h2, h4 are the inlet and exit enthalpies of refrigerant mext is the mass flow rate of the external fluid Cp, ext is an average specific heat of the external fluid Text,o and T ext,i are the inlet and exit temperatures of the external fluid

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