View Full Version : how to select refrigeration equipments for -18 freezer room

02-04-2017, 10:12 PM
What is the selection procedure for selection of Compressor, condenser(air-cooled), evaporator, exp valve for R-22 & R-404a refrigerants to use this system for -18 freezer? If my compressor is 20 HP semi-hermetic than what will be evaporator and condenser size.

02-04-2017, 10:44 PM
No. 1, select a refrigeration engineer.
No. 2, ask him to design your system.

04-04-2017, 07:54 PM
thank you so much for opening my eyes sir.......appreciate the reply..:cool:

Rob White
05-04-2017, 12:18 PM

You are starting at the wrong place.

You have an engine and you are asking how big is the bus
that I need to build around it?

What you should be asking is how many people do I need to move????

You need to know your product load before you then size the evaporator,
after sizing the evap to the load you size the compressor to the evaporator.
Then you size your condenser to reject the heat from both the evap & comp.

As a rough rule of thumb the compressor will be about a third of the size of
the evaporator, so a 9kW evaporator would require approximately 3kW of compressor
and then both 9kW + 3kW = 12kW would be rejected from the condenser.

Just rough numbers mind and the real system is more complicated.