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buffalobillpatrick · 01-11-18, 10:13 AM

The reason for the flat plate HX is: the buried 450’ loop of 1” pex is open to Oxygen permiation,
& the house heating system is closed O2 barrier pex.

The buried pipe can hold about 13.5 gallons so I need to put about 7 gallons of propylene glycol in it?

Some of it goes under a window well & is only about 16” below bottom, so cold Winter air could freeze it if no glycol.

I bought a Honeywell dew point controller & a line voltage cooling only thermostat.

I plan to pump the buried loop through the flat plate HX (rated at 50,000 BTU,s)
with a Grundfos SS Alpha ECM pump,
Under 10 Watts on low.

01-11-18, 10:13 AM	#52
buffalobillpatrick Master EcoRenovator Join Date: Mar 2014 Location: Florissant, Colorado Posts: 599 Thanks: 814 Thanked 59 Times in 55 Posts	The reason for the flat plate HX is: the buried 450’ loop of 1” pex is open to Oxygen permiation, & the house heating system is closed O2 barrier pex. The buried pipe can hold about 13.5 gallons so I need to put about 7 gallons of propylene glycol in it? Some of it goes under a window well & is only about 16” below bottom, so cold Winter air could freeze it if no glycol. I bought a Honeywell dew point controller & a line voltage cooling only thermostat. I plan to pump the buried loop through the flat plate HX (rated at 50,000 BTU,s) with a Grundfos SS Alpha ECM pump, Under 10 Watts on low. Last edited by buffalobillpatrick; 01-11-18 at 10:50 AM..