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Solar assisted radiant floor heating system - Page 10

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Posted by Gary on January 14, 2007, 3:00 pm
SJC wrote:

Most air collector boxes are pretty well sealed -- if they are not sealed pretty
well, they don't work :)  I don't see how they would be any kind of significant
source of dust.  Certainly nothing like opening doors and windows.

I've not seen mold in a collector.  I seems unlikely that mold would grow in a
space that is frequently subjected to 180+F ??

To me, adding an air-air exchanger seems costly, inefficient, and unnecessary?


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Posted by SJC on January 14, 2007, 6:42 pm


  These are not air collector boxes, they are fluid solar thermal collectors
doubling as fluid and air boxes. You can leave out the air to air exchanger
and when there is a funny smell one winter, you can explain that to your wife :)

Posted by Rob Dekker on January 15, 2007, 5:05 am

I am intrigued by the interesting discussion that follows about using the DHW
solar collectors
for both water and air heating, but, although I am not an expert in this field,
I don't see what
the benefit would be (versus simply using the panels for water heating).

Each panel collects X Btu/hr in solar energy, and you can take that out in hot
water OR in hot air,
but you will never get more than X Btu/hr in energy out of the panel.

On top of that, hot air into the house ends up against the ceiling (and I have
high ceilings)
which leaves me with a hot head and cold feet. Hot water into the radiant floor
on the other hand gives me warm feet and a cool head. Much more comfortable...

Consequently, I count that I would need less Btu's to feel comfortable with a
heater than with (solar powered) hot air. That is, IF I can keep enough heat from
ending up into the concrete slab (which is not insulated as far as I know).



Posted by Anthony Matonak on January 15, 2007, 9:56 am
 Rob Dekker wrote:

solar collectors

field, I don't see what

water OR in hot air,

Solar panels are more efficient the cooler they run. This is due to
heat loss through the glass (or other front cover). This means that
solar panels delivering 80F air are going to be more efficient than
solar panels delivering 120F water. Solar air heaters are also less
expensive because they don't require plumbing.

high ceilings)

floor heater

Ceiling fans are the traditional solution to that issue.


Posted by Rob Dekker on January 16, 2007, 6:19 am

solar collectors

field, I don't see what

hot water OR in hot air,

Makes sense, and of course you are right.
However, the gain might be marginal :
A good sealed and insulated DHW panel should run at 80% efficiency or so.
So I would be surprised if dropping the temperature would gain you more that 10%
extra energy.

Here we were talking about an installed water-heating panel. So the plumbing is
already there.
Installing the ducts for the air in and output would be extra.

have high ceilings)

floor heater

Thanks. Right. I personally am not a fan of a fan ;o)  Too much movement.
But you are right that they do even out the temp diffs in a room.

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