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Will this work in my evac system?
A little background. I live in NH. I have a solar evac tube system. 50 tubes in all. I have a 80 gallon indirect water heater used as a storage tank. This tank heats my domestic hot water. I typically shut down my system when I snowbird in FL for 4 months by covering the arrays with a tarp. I leave my house thermostat at 50 degrees F. What I was thinking about doing was installing a 50,000 BTU water to air heat exchanger like this: http://www.outdoorfurnacesupply.com/uh50.html?CAWELAID=520011210000000907&CAGPSPN=pla&catargetid=520011210000000001&cadevice=c&gclid=CKSH-vSZ8MYCFUuRHwoduasFog#
I would bypass the storage tank and all the solar heated glycol would pass through this heat exchanger and would be used to raise the temperature of my basement a little. I would wire the fan to the circulator pump so that it will start when the circulator starts. Will this work? The only concern I have is will the heat exchanger extract enough heat from my closed loop system to prevent the temperature from continuing to rise and overheating my system or will it remove enough heat to keep the temperature at bay? I'm wondering if for example, if the liquid entering the exchanger was 125 degrees F, what would the temperature be exiting the exchanger?