What is the effect of Condenser Pressure
The condenser pressure or discharge pressure is another important factor, that affects the performance of a vapor compression system. Let the discharge pressure be increased from P2 to P2‘ on the P-h diagram. Its effect will be.
- Decrease in refrigerating effect from from (h1-h4) to (h1-h4‘)
- Increase in compressor work from (h2-h1) to (h2‘-h1)
- Decrease in volumetric efficiency due to increase in the pressure ratio.
- Increase mass flow results increase in power consumption.
- Decrease in COP.
This shows that the increase in discharge pressure results in a decrease in COP. Hence the discharge pressure should be kept as low as possible depending upon the temperature of the cooling medium available.