06-22-14, 03:13 PM | #1 |
Master EcoRenovator
Join Date: Mar 2014
Location: Florissant, Colorado
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buried solar tank + heat pump, insulate?
Conventional practice is to highly insulate a solar storage tank.
But, when this solar storage tank sources a W/W heat pump it may be more efficient & cheaper to NOT insulate the tank. Heat moves from an uninsulated tank into the surronding earth MUCH faster (10-20X) or so depending on soil type & ground water.. But it's not all lost, when the HP draws the tank temperature down to below the surronding earth temperature, heat moves back into tank, possibly 25% of it. This still sounds like a loss, but consider that MY solar panel array will be WAY oversized (10-15X) vs. summer DHW use. The surplus, solar heat in warm weather can be dumped into the earth with part of it being used in cold months. Plus a cooler tank will allow the panels to be more efficient. Edit: They insulate the top only. See: Laramie, Wyoming - Thermal Battery Systems | Thermal Battery Systems Last edited by buffalobillpatrick; 06-22-14 at 09:54 PM.. Reason: correction |
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