Condenser Capacity formula

•  open drive comp = 1.25 x compressor capacity

•  hermetic comp = 1.30 x compressor capacity

Example: find the size of condenser required for refrigeration system with hermetic compressor having a capacity of 24000 Btu/hr.

1.30 x 24000 = 31200 Btu/h

Air Cooled Condensers

•  the affect of changes in refrigerant condenser condensing temperature

•  a 1 F change in subcooling will change system cap by 0.5%

•  a cooling 10 F change in ambient changes condenser capacity by 3%

Condenser Capacity Control (air cooled)

•  required to maintain proper pressure drop at the metering devise (75-100psi)(difference)

•  normally required if outdoor if outdoor ambient drops below 55 F