Does anyone have insight on a relatively easy way to model free-cooling
coils on air-cooled chillers? I thought adding a drycooler might help
simulate this, but I don't even think you can attach a heat-rejection
device directly to a chilled water loop. Is this one of those things
that you have to "estimate" by approximating the total # of available
free-cooling hours and subtracting compressor energy?

Thanks

James Hansen, PE, LEED AP