Solar Hot Water Systems - PV vs delta T control [RE-wrenches]

[sunwise at cheqnet.net]

Original Message: David

I can forsee a problem with the PV powered pump happly pumping cold water into a hot tank because the PV panel is very efficiently running the pump (cold temp.) but the collectors are not warm yet.

I use a small PV and Hartel HEH-10 pumps exclusively.  I always use a tempering tank and the heat exchanger is plumbed to the T-tank with a passive exchange.  The hot water generated in the heat exchanger naturally rises up and into the tempering tank.  If the pump is moving colder glychol through the heat exchanger, the potable water side of the heat exchanger stagnates and no cold water finds its way into the tempering tank.  Seems to work.

Kurt Nelson

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