Does anyone have any really good information on "engineering" heat transfer with glycol and derating the tonnage and/or btu's. Just looking for facts that could help every day kind of stuff. I am also looking for information that supports the percentage loss between propylene and ethylene glycols.
Also looking for engineering studies about derating tonnage of chillers when leaving water temps setpoints drop from standard 40 F and below. I was just told by an engineer that with every degree setpoint drop in lvn water setpoint below 40 F equals around a 3% derate in tonage.