Frost Protection on AHU Unit with Plate Heat Exchanger Heat Recovery
Frost Protection on AHU Unit with Plate Heat Exchanger Heat Recovery
(OP)
I am designing a 100%OA system where frost protection (35%glycol) will be running through heating coil (AHU unit has Plate heat exchanger). Winter outdoor temperature is -7 C. My question is what temperature I need to bring the air at the heating coil to avoid any damage on the coil? There are also reheat coils at each zone.
Any design suggestion??
Any design suggestion??





RE: Frost Protection on AHU Unit with Plate Heat Exchanger Heat Recovery
RE: Frost Protection on AHU Unit with Plate Heat Exchanger Heat Recovery
RE: Frost Protection on AHU Unit with Plate Heat Exchanger Heat Recovery
I'd like to know what temperature I need to bring the outside air to. I think I have to heat outside air up to 55F but I saw someone was saying it should be enough to bring outside air to +5 C (41 F) somewhere in the forum. Is there a common application/rule for this temperature? Regards
RE: Frost Protection on AHU Unit with Plate Heat Exchanger Heat Recovery
Look at ASHRAE it has LAT calculations formula - if you still can't find it, then we will. It is easy to give you the answer, but I think you should be able to dig it easily so you can remember it.
Use a condensate drain for the wheel, and don't forget to heat trace it.
Locate you pre-heat coil upstream of wheel.
RE: Frost Protection on AHU Unit with Plate Heat Exchanger Heat Recovery
Thanks for the tips!