condensers

[martinw58]

can anyone tel me how to calculate condenser size from evap duty

[wambat]

can anyone tel me how to calculate condenser size from evap duty

Is this for air conditioning duty and is it air cooled or water cooled?

[GXMPLX]

You can't.

Condenser heat rejected = evaporator heat absorbed + heat of compression

[wambat]

If you know the evaporator temperature and you have the evaporator load then you need a mfg heat rejection factor for either an open compressor or a suction cooled compressor EX; evaporator load = 12,000 btu
evaporator temperature = 20*F
from mfg condensing table for suction cooled compressor the temperature heat correction factor = 1.33 for say 110 condensing temperature = ~ 4,000 btu for a total of 14,000 btu condenser.I would use 15,000 btu. If I wanted to know what HP fan motor to use I would devide 15,000 btu/1.08 x TD = CFM for air cooled condenser