Introduction to condenser
Condenser is an important component of any refrigeration system. In a typical refrigerant condenser, the refrigerant enters the condenser in a superheated state.
- In a typical refrigerant condenser, the refrigerant enters the condenser in a superheated state.
- It is first de-superheated and then condensed by rejecting heat to an external medium.
- The refrigerant may leave the condenser as a saturated or a sub-cooled liquid, depending upon the temperature of the external medium and design of the condenser.
- Figure shows the variation of refrigeration cycle on T-s diagram.
- In the figure, the heat rejection process is represented by 2-3’-3-4.
- The temperature profile of the external fluid, which is assumed to undergo only sensible heat transfer, is shown by dashed line.
- It can be seen that process 2-3’ is a de-superheating process, during which the refrigerant is cooled sensibly from a temperature T2 to the saturation temperature corresponding condensing pressure, T3’.
- Process 3’-3 is the condensation process, during which the temperature of the refrigerant remains constant as it undergoes a phase change process.
- In actual refrigeration systems with a finite pressure drop in the condenser or in a system using a zeotropic refrigerant mixture, the temperature of the refrigerant changes during the condensation process also.
- However, at present for simplicity, it is assumed that the refrigerant used is a pure refrigerant (or an azeotropic mixture) and the condenser pressure remains constant during the condensation process. Process 3-4 is a sensible, sub cooling process, during which the refrigerant temperature drops from T3 to T4.