Posted by VaTom on March 06, 2014 at 19:09:21 from (70.32.203.33):
In Reply to: Re: Solar heating? posted by Rich_WI on March 06, 2014 at 16:24:19:
Thanks guys, never know when something's a little too obscure for general interest.
I determine mass need by calculating how much heat is needed in winter. Then it's a simple process to size the mass to store the number of BTUs at the low temperature differential (ΔT) that PAHS uses. If the convenient mass is insufficient, the choices are to increase it, or reduce the heat loss. Normally, that's dealing with glazing loss.
Too much mass is possible, but only if it's not dealt with in this annual manner. A house with extreme mass that is allowed to reach uncomfortable temperature will take a very long time to get comfortable. PAHS doesn't allow that by maintaining near ideal room temperature all year.
Insufficient mass will show up with larger temp swings. That's my case, with an annual temperature swing of 13º, whereas a better PAHS house will have no more than 7º. Not that 13º is difficult to live with. I could reduce that 3º by simply adding window treatment, but we don't bother.
PAHS really is this simple. As I mentioned, I had little idea when I built and it worked better than any other house around here. A good friend has a similar size house and burns 4 1/2 cords of hardwood every year, maybe 6 cords this year. Cuts it from my woodlot, I burn very little.
If you wanted to raise your indoor temp 4º, you wouldn't need much added heat either. When I'm feeling lazy I put on a sweater instead of lighting the stove. I know, I'm spoiled after 20 years of this. As I get older, Medicare age this summer, my PAHS decision looks better and better.
Did I mention that there is never re-roofing needed?
New builds coming soon in Oklahoma, Vermont, and Maine. Guy in Indiana is waffling, has free natural gas from a storage facility on his property. A primary motivation for him is a house that won't blow away. My small footprint roof weighs 200 tons, with the steel welded together. I used commercial construction materials, ubiquitous in commercial construction due to low cost and low skill level required.
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