[SB-r-us] Re: Re: PAHS/AGS /solar supplemented under home heat storage in NNA
- Sgrìobh Michael Lough:
>I have read the description of PAHS and I dont see it working withNo. He recommends plenty of earth cover, but that's not
>SB homes as there is a requirement for an earth cover overall
>structure isnt there>?
incompatible with strawbale construction. For instance, you could
have the exposed walls of strawbale, and the bermed walls done in
some other fashion. That is essentially what I will have when I get
done building a new north wall and earth-berm it. Likewise, you can
have a living roof on top of an otherwise conventionally-built
>I think we can outrule this on the strength of it being not for SB right?Nope!
>I think where we are in NNA we could probably say there isNo heat that we can use passively, yes. (There will always be
>effectively noheat we can use from the deep earth without storing it
areas where the ground heat is warm enough, but they are the
exception rather than the rule.)
Heat pumps are another story, of course.
>I can see heating up a mass under a floor and the heat rising overYep. It starts wet, and it gets dryer over time. Since you are
>the months but for how many months after it rained all October? I
>know I know the earth is dry because of the umbrella but what dried
>it? Thewind? Surely not the heat from the solar HEATEDpiped in air
largely preventing the introduction of new moisture, it will get
dryer until it reaches some kind of equilibrium state. Remember that
it doesn't have to be bone dry; it just has to be dry enough so that
the groundwater is not moving, and thereby transporting heat. In
fact, if it retains some non-moving moisture, that just makes it a
better thermal battery.
>How much heat can be left after annual drying for storing afterIt doesn't have to dry all the way annually. If your ground has
>doing this every year ?
so much groundwater in it that you going to have to dry it out
annually even after you are preventing the introduction of moisture
from above, then you probably shouldn't he attempting an AGS system.
>(The wastage of this system must be huge just trying to keep some of60-80% "wasted", according to Stephens, which is why you would
>it warm long enough and hoping it (some) will come up in a few
use only completely renewable heat source for it. I'd rule out
anything which produces pollution, too, like wood, even if you could
argue that it is renewable.
But if the sunlight is falling on you, there's no harm in putting
it where it's most useful.
>better to be on a daily / monthly heating flywheel more efficientSure, if you have it at the time. But the whole point of an
>to use heat as it is created rather than an annual one maybe?
annual system is that when you have the heat (in the warm months) is
not when you want it (in the cold months). So if you can store the
heat without using non-renewable energy sources, you should.
>Maybe a system that willWhy would you want it overnight? For daily storage, massive
>provide a significant temperature lift overnight in a SB from
>4 hours of sun the day before?
passive solar works fine. Even in my drafty house, at 10°F or 20°F
outside, and 60°F at dawn inside, by noon we're topping 70°F. If I'm
up until the wee hours, I put on a sweatshirt.
>We assume it is impossible this far North to create a system thatYou can assume it all you want. I'd rather find a way to do it
>uses no supplemental heat at all in NNA in Winter?
than just say, "Well, it can't be done, so let's burn as little
fossil fuel as we can."
>With a daily /monthly heat capture mass storage system you couldDo both. The systems aren't mutually exclusive.
>always have the option of a fluid to air heat exchange on sunny days
>for diversion to anywhere you liked with the right ducting (or
>Well I asked Don Stephens to get involved in this question but noThat he's busy. He told me so, off-list, and said he'd post when
>answerWhat do we make of this I say?
he got caught up.
In certain circumstances, urgent circumstances, desperate
circumstances, profanity furnishes a relief denied even to prayer.