Remote Condenser Sizing

Gents,

Your opinion please. When engineering a new remote condenser, how would you size it?

Currently I've been educated to first select my compressors at design conditions, say at -25C SST/45C SCT, which for this exercise we will pick a compressor capable of 100kW cooling capacity, with 145kW THR.

I now use the previously selected compressor and change the SST from -25C to -5C. Then, using the increased THR of say 165kW resulting from the new SST to select my condenser.

The theory being that condenser will more than cope with the recovery involved in a total plant failure or after excessive defrosts. But then be oversized, but costly for initial install, when operating at design conditions.

Thoughts?

I'm no design engineer, but sometimes in the condenser selection it may be borderline on one size, so this can help make decision.
Client, if a good educated one can be given both selections as well, but not in all cases.
Maybe go I between what you think & say -10 to 15 C SST & see what it comes up with.
Rooms should recover pretty quickly after defrost unless abused.

From my experience in a hot ambient, after working out the condenser capacity needed, I choose the next size so unit can cope with the problems you have mentioned.

One stem bigger is not a big difference in price and unite will work better.

Goober.
I usually select capacity at -10'C SST for condenser selection and use MOP TXV's as well to limit load on compressor after defrost .

Cheers all. Seems we are in a agreement. I shall power on doing what I'm doing then.