Determining target subcooling
Determining target subcooling
(OP)
I'm trying to come up with the formula used to determine target subcooling for an air conditioner.After several inquiries to major manufacturers, no one can seem to explain to me how the 10-15° target is determined. I already know how to find existing subcooling. I'm looking for the formula that determines the target for a subcooling chart. Input please?





RE: Determining target subcooling
RE: Determining target subcooling
Longest allowed liquid line run.
Highest allowed elevation differential between condenser and evaporator.
A bit of undercharge.
A reasonable assumption of high-load and high ambient operation conditions (not design condition).
Consider also that likely don't have control of the compressor's maximum flow rate, so playing with the amount of sub-cooling is your way to balance compressor capacity and system capacity.
Balance that against:
Coils are expensive and you don't want to buy a bigger coil than needed.
Refrigerant is expensive and you don't want to have to fill up that big coil