do you mean a drainback system? they're pretty common in space heating
systems here in the midwest. a 4-5 panel pressurized system will do ok
in the summer with out a huge dump load if the tank's reasonably sized,
and the panels are tipped steep enough.
drainbacks are common where there isn't room for a huge storage tank
(just the 80-120 for the DHW part of the system) and any extra heat goes
into a fan coil or coil in the furnace or whatever will get it into the
house. in the summer when there's no heat load, the tank high limits at
140 F or so, and then shuts off.
hot water systems are so regionally specific, that without knowing more
of the situation, that's all I can give you.
Karl
Troy Harvey wrote:
I'm wondering how many of you out there have installed medium sized
solar hot water systems (6-8 panel) that were designed to stagnate
during summertime over production as opposed to diverting to a heat
dump or radiator? The International solar agency has a couple of
papers that show a properly designed system should be able to stagnate
in a way that the boiling glycol mix vapors in the panels, purge the
panels of fluid, turning off the system without degrading the glycol.
That doesn't seem to be a typical way to design systems in the U.S. ,
we've usually gone to a heat dump. Does anyone have experience with this?
Troy Harvey
---------------------
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Karl Schwingel
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NorthWind Renewable Energy LLC
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