Sounds more like you. Try looking through a window instead of a mirror.
*plonk*
--
Steve Spence
Renewable energy and sustainable living
http://www.green-trust.org
Discuss vegetable oil and biodiesel
powered diesels at
http://www.veggievan.org/discuss/
> Nope, same one. Rip-off artist, bullshit artist - full of
> shit and full of himself, that's nick ....
> On Tue, 11 May 2004 07:18:02 -0400, "Steve Spence"
> >Must be a different Nick. The one I speak of is Nick Pine, mathematics
and
> >thermodynamics guru. He's helped me with my project numerous times,
although
> >he has little use for nitwits.
> >
> >--
> >Steve Spence
> >Renewable energy and sustainable living
> >http://www.green-trust.org
> >Discuss vegetable oil and biodiesel
> >powered diesels at
> >http://www.veggievan.org/discuss/
> >
> >>
> >> > Nick must have caught you in a math misspeak. Every one here knows
> >Nick's
> >> > credentials.
> >>
> >> Nasty Nick the criminal.
> >
> Paul ( pjm @ pobox . com ) - remove spaces to email me
> 'Some days, it's just not worth chewing through the restraints.'
> HVAC/R program for Palm PDA's
> Free demo now available online http://pmilligan.net/palm/
> Free Temperature / Pressure charts for 38 Ref's
http://pmilligan.net/pmtherm/
nicksanspam@ece.villanova.edu wrote:
>
>
>>I live in South central Iowa... I just put up a 40X56X12 ft sidewall shop.
>>Now it is time for the heat...
>
>
> Piece of cake... See
>
> http://users.montanadsl.net/~reysa/
>
> NREL says 930 Btu/ft^2 of solar heat falls on a square foot of south wall
> on an average 24.4 F December day in Des Moines. Rotate the shop so one
> 56'x12' = 672 ft^2 side faces south, if needed, then apply a single layer
> of Dynaglas corrugated polycarbonate "solar siding" (which comes in 4'x12'
> sheets) over a 6" air gap with vent holes through the south wall to collect
> 0.9x672x930 = 562K Btu of sun on an average day.
>
> With R20 wall and ceiling insulation and a 2240 ft^2 ceiling and 1632 ft^2
> of non-south walls and heat storage under the ceiling, the air coming out
> of the upper vents on an average December day might have temp T (F), where
> 562K = 8h(70-24.4)672/R1+8h(70-24.4)1632/R20+24h(T-24.4)2240/R20, so T1 F.
>
> If the ceiling store has an average (130+80)/2 = 105 F temp over 5 cloudy
> days, the shop needs 5(8h(70-24.4)2304/20+24h(105-24.4)2240/20)) = 571K Btu
> for 5 cloudy days in a row. This might come from 571K/(130-80) = 11,424
> pounds or 178 ft^3 or a 1120ft^2x2" or 2240ft^2x1" of water in overhead
> flat plastic film ducts cooling from 130 to 80 F, with a slow ceiling fan
> and a thermostat to bring down warm air as required.
>
> Nick
>
Hi,
The barn collector (referenced above) is still working well. It is
starting to make the garage too warm on sunny warm days, so I plan to
add the outside collector vents, and seal off at least some of the vents
going to the garage soon.
There are some small (but maybe important) things I would change in the
construction. I'll add these to the write up when I get some time, but
briefly:
1) I would add light weight horizontal supports to the glazing at around
2.5 ft intervals -- i.e. two supports for my 8 ft panels. This would
control the tendency of the glazing to bow inward or outward. When the
wind blows from the North, it creates a negative pressure on the South
side of the barn and causes the panels to bow out. This hasn't caused
any failures, but I think over time it might. I plan to add these to
mine sometime during the summer.
I think that something like a 3/4 inch by 3/4 inch would be enough.
Maybe painted white to reflect sun further into the collector?
2) If you can get the 4 ft wide glazing panels this is a real plus, in
that it eliminates the intermediate vertical panel supports, and makes
it easier to add the horz supports mentioned in 1.
3) I would use two layers of black screening for the absorber instead of
one. The one bay I have that has two layers does better.
4) I am about to add the summer vent openings to keep the collecters
from getting too hot during the summer when the vents to garage will be
closed off. I am going to try using a couple of the cover plates that
are used on outdoor electrical outlets. These can just be fliped open
or closed easily, and they have foam gaskets that seal well. I will
install 1 or 2 of these per 4 ft bay in the upper sill, and the same in
the lower sill. I'm not sure if this will provide enough area or not --
I will add the results to the writeup.
-------
I have some thoughts on an even simplier collector for
garage/barn/workshop situations that I'll try to gather together and
post in a few days.
Gary
>
>>I live in South central Iowa... I just put up a 40X56X12 ft sidewall shop.
>>Now it is time for the heat...
I missed the original post. My shop is in DeSoto, Iowa (16 mi
west of Des Moines on I-80) and occupies a 2500 ft² aircraft
hanger. I managed to keep the otherwise unheated and somewhat
drafty shop above freezing all winter with the 6'x12' collector
pictured near the bottom of http://www.iedu.com/DeSoto/pix.html -
I plan to rebuild this one and add two more before this next winter.
Stop out for coffee next time you're in the Des Moines area.
---
Morris Dovey
DeSoto, Iowa USA
> shit and full of himself, that's nick ....
> On Tue, 11 May 2004 07:18:02 -0400, "Steve Spence"
> >Must be a different Nick. The one I speak of is Nick Pine, mathematics
and
> >thermodynamics guru. He's helped me with my project numerous times,