Ben,
From
http://www.greenbuildingadvisor.com/blogs/dept/musings/hot-climate-design
The most important factors are:
- ceiling should be insulated to at least R-30
- use highly reflective roofing
- replace incandescent lighting with fluorescents (or LEDs)
I would add to that insulating the west wall, assuming it gets sun all
afternoon. Maybe the east wall. The other walls probably won't make
much difference since they are mostly in shade.
If you want lots of details, check out
http://energy.gov/sites/prod/files/2013/11/f5/18899.pdf
I understand that your preferred solution is to spend no additional
money. However, if you are going to run an A/C in the garage, I know
you are well aware that there is a payback for doing these energy
savings techniques.
Peri
------ Original Message ------
From: "Lee Hart via EV" <ev@lists.evdl.org>
To: "Electric Vehicle Discussion List" <ev@lists.evdl.org>
Sent: 31-May-15 3:38:06 PM
Subject: Re: [EVDL] Success!
Ben Goren via EV wrote:
They might be open to keeping the window A/C unit in the garage for
the purposes of keeping the batteries cool. Seems like that might be
the only other measure worth considering.
I live in Minnesota, where we have the opposite problems with our
garages -- keeping them *warm*!
My house had the usual bare 2"x4" stud walls, with no insulation, no
inside sheathing on the walls, and only drywall on the ceiling.
I added 4" of fiberglass insulation; that barely helped. I added 8"
fiberglass to the ceiling; that helped noticeably. Then I added 1/4"
polystyrene panels to the wall, and covered them with masonite pegboard
(for protection, and so I can hang tools etc. on them). That helped
even more. The mass inside the garage (mainly the concrete floor) meant
that even without heat, the closed garage stayed at about the average
of the day/night temperature.
And, I could heat it about 40 deg.F with a pair of 240vac 15amp
electric heaters. That was OK for cool weather (like 30 deg.F outside,
70 deg.F inside. Last year I broke down and installed a small gas
furnace. Now I can heat it to 70 deg.F even when it's 0 deg.F outside.
Maybe if you insulated the garage, then a small window air conditioner
would have no trouble keeping it reasonably cool.
Or, could you add some passive thermal mass inside the garage; rock, or
a few dozen 5-gal jugs full of water (closed, just for their thermal
mass)?
-- The greatest pleasure in life is to create something that wasn't
there before. -- Roy Spence
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
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