Hi all,
As I understand it, the nighttime sky looks like a 4 degree Kelvin source.
(going from memory here) A well designed solar panel is insulated so that
the ENERGY goes in and out only by RADIATION from the front and by CONDUCTION
to the working fluid. ENERGY that leaves a black body (the solar panel)
is balanced by the ENERGY coming to it when at equilibrium. If the panel was in
outer space and not facing the sun it would cool down to 4 degrees
above absolute zero when there was no heat input from the working fluid. Here
on earth the atmosphere reflects heat energy radiated from the earth,
back to the earth (the green house effect) so a perfect black body at night
with a perfectly transparent window and perfect insulation would still not
get down to 4 degrees K. But it will defiantly get well below freezing. In
fact most solar panels need to be protected from freezing even in the
summer. So it will make ice, the question is how much and is it worth the
investment. If solar heat is needed during the day, then this would be
an added use for the collectors. Air could be the working fluid and the
thermal mass of the cool room could be the storage medium (instead of ice)
then the system gets simpler.
"Doug Younker"
<[EMAIL PROTECTED] To: <[EMAIL PROTECTED]>
net> cc:
Sent by: Subject: Re: [Biofuel] Creating
a cool room storage in a hot climate - solar.
biofuel-bounces@
wwia.org
09/15/2004 03:12
PM
Please respond
to biofuel
Hi,
But, to create ice wouldn't that require the night time temperatures to
get to freezing? Even if the goal was to cool a heat sink, power is still
would be required.
Doug
----- Original Message -----
From: <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, September 14, 2004 11:47 AM
Subject: Re: [Biofuel] Creating a cool room storage in a hot climate -
solar.
:
:
:
:
: Greetings to all.
:
: A new member here.
:
: If you have clear skies at night most of the time, solar panels can be
used in reverse to radiate heat all night long. Circulate anti freeze from
them
: to your block of ice during the night and use the ice in the usual way.
Not shure how much heat you can get rid of in this way. A calculation or
: experiment is in order. The panels could be used for heat gain during the
day in their usual way. Mount on top of your dirt mound for shade.
:
:
: _______________________________________________
: Biofuel mailing list
: [EMAIL PROTECTED]
: http://wwia.org/mailman/listinfo.cgi/biofuel
:
: Biofuel at Journey to Forever:
: http://journeytoforever.org/biofuel.html
:
: Biofuel archives at Infoarchive.net (searchable):
: http://infoarchive.net/sgroup/biofuel/
---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.754 / Virus Database: 504 - Release Date: 09/06/2004
_______________________________________________
Biofuel mailing list
[EMAIL PROTECTED]
http://wwia.org/mailman/listinfo.cgi/biofuel
Biofuel at Journey to Forever:
http://journeytoforever.org/biofuel.html
Biofuel archives at Infoarchive.net (searchable):
http://infoarchive.net/sgroup/biofuel/
_______________________________________________
Biofuel mailing list
[EMAIL PROTECTED]
http://wwia.org/mailman/listinfo.cgi/biofuel
Biofuel at Journey to Forever:
http://journeytoforever.org/biofuel.html
Biofuel archives at Infoarchive.net (searchable):
http://infoarchive.net/sgroup/biofuel/
