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Planning new oil furnace and solar hot water installation - Page 2

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Posted by Mark Schofield on May 19, 2007, 10:32 pm
 
how are you coming along on your installation, the final decisions on tanks,
pumps, ext.?


Posted by Christian Kaiser on May 20, 2007, 8:57 am
 
Look at my web page (http://www.invest-tools.com/pub/solsys ) where I
tried to present my thoughts about my system. Possibly that helps.

120 gal (450 l) is about the size I have (500l), and I'm glad I bought
that much (2 grownups, 3 kids). 77% efficiency in the last 12 months.
We're much more south than you are, but maybe more mists.

Although I suggest you should buy a storage that contains the water of
the furnace (which heats the top (only) of the storage if needed), and
has a heat exchanger for the DHW water to reduce the amount of DHW water
kept hot (danger of legionelles!). So 2 heat exchangers yes, but the top
one as DHW exchanger.

About problems of furnaces switched off during summer, there are 50% pro
and 50% con in forums I asked, but nobody knows for real. I wouldn't
know why there should be a problem, as the water in the furnace is at
least as warm as the surrounding, so I expect no condensates which could
cause rust.

The burner's control itself (model from 1988) tells me it knows better,
as it heats up every other day for about 7 minutes if I don't have it
switched off. But I have.

Christian

Mark Schofield wrote:


Posted by Christian Kaiser on May 20, 2007, 8:59 am
 Sorry, didn't see you warmed up the subject. Anyway it would be nice if
he would present some data now, as you suggest ;-)

Christian

Mark Schofield wrote:


Posted by Mark Schofield on May 20, 2007, 12:15 pm
 how are you coming along on your installation, the final decisions on tanks,
pumps, ext.?



Posted by LML999 on May 22, 2007, 3:45 am
 wrote:

Thanks for asking.

Oil burner and tank are selected, the WM Ultra, and a Roth rectangular
(upright) oil tank. Still researching vendors, panels, etc for the
solar portion of the installation. Will probably go with a SuperStor
120, althought I'm wondering whether a dual tank setup would be more
efficient. Here's my thoughts:

With a large single tank, with an extended run of solarfree days, I'll
be heating a 120 gallon tank for DHW.

With two tanks, on solarfree periods, I'd be heating an appropriately
sized DHW tank, and using the solar storage tank as a tempering tank
only.

During sunny weather, the solar storage tank would preheat the DHW to
a point that when the water hits the second tank, it will be hotter
than called for by the tank and that zone won't call for heat. The
SuperStor Ultra is specced to lose 1/2 degree per hour.

Not sure which will work out to be more efficient for my New England
installation.

Thoughts?

Lee


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