ammonium absorbtion cooling
a...@eden.com
I am looking for anybody that has some experience with ammonuim
absorbtion cooling. I am trying to build a large deep freeze for my
cabin and want to run the heating element off of either p/v or solar hot
water.
Yes I know you can buy these but I really dont have 1400 bucks to blow
on a freezer and I love to experiment and have some time to do so.
any and all info welcome
thankx
a...@eden.com
Steve Spence
You don't need batteries if you don't mind your food getting warm after 2
days of no sun.
--
--
Steve Spence
NorthEast Region Systems Engineer - Sequel Technology
ssp...@sequeltech.com
http://www.sequeltech.com
MSBeta 254651
ClubIE MSDN MVP
--
David Wells wrote in article <33B7B0...@erols.com>...
>There are a few companies making refrigerators powered by heat which use
>the ammonia absorption cycle which I can look up in my Real Goods
>catalog. One is made the Servel company. My dad used to have a Servel
>when I was a kid, and it seemed to work fine.
>
>Just for some unfair math comparisons, I will note that the Servel
>refrigerator has a total volume of 7.7 cubic feet, including the 1.7
>cubic foot freezer. The thing runs on propane or electricity, and
>consumes about 1.5 gallons of propane per week (thats about 9 pounds per
>week), and if I apply the $8 fill-up cost for my 20 lb propane tank to
>this, this means you will spend about $0.60 per week for propane, with
>refills about every three months. Not bad, if you ask me.
>
>The cost for the Servel, in my old catalog, was $1,395.
>
>As an alternative, the Real Goods catalog mentions the 12 volt D.C.
>electric refrigerator made by Sun Frost. The most popular model,
>according to Real Goods, is the 12 cubic foot Sun Frost RF-12 which
>draws about 336 Watt-hours per day at 70 F ambient. The cooler can be
>run by two 48 watt solar pv panels.
>
>Maybe someone out there could figure out how much two 48 watt pv panels
>typically produce per day over several locations, and then let us know
>if batteries are needed. I'd also like to see the cost figures. My
>Real Goods catalog is an old 1993 job, and shows Siemens 48 watt panels
>costing $329 per panel. If you need two panels, this is $658 for the
>panels, which will buy me about 82 propane refills at $8 per 20 lb of
>propane, which if I refill once every three months means that I can
>refill the thing for 20 years before I reached the cost of the solar
>panels (pretty depressing). Looked at another way, if I could get 8%
>interest on the $658 cost of the panels per year, this would be $52.64
>per year, which is 6.6 refills of propane per year. Also bad.
>
>My cost figures are really old, and yes, this excercise will surely get
>me some hate mail, but, heck, I have fun reading my mail...
>
>-Dave
>.
>
David Wells
Nick Pine
Steve Spence <steve...@worldnet.att.net> wrote:
>You don't need batteries if you don't mind your food getting warm after 2
>days of no sun.
This might work well if the "battery" were some ice that melted over 2 days.
>David Wells wrote:
>>the 12 cubic foot Sun Frost RF-12... draws about 336 Watt-hours per day
>>at 70 F ambient... The cooler can be run by two 48 watt solar pv panels.
Anyone know the COP of a typical fridge? That 336 Wh might move about 1.1 kWh
per day or 48 Btu/hour of heat, with a COP of 3, so the fridge might stay cool
for 2 days if it began with 2x1100/144 Btu/lb = 16 pounds of ice above it, eg
4 1/2 gallon plastic milk jugs. Losing 48 Btu/hr from ice containers with a
10 F delta T and a still air film thermal conductance of 1.5 Btu/h-F-ft^2
requires a total surface of 48/10/1.5 = 3.2 ft^2.
Nick
David Wells
Nick-
Ever visit Montpelier in Virginia? Thomas Jefferson used a huge "ice
vault" about thirty feet in diameter, buried in the ground, to give him
year-round ice, before the refrigerator was invented.
Hellofaguy, that Jefferson...
-Dave
David Wells
oops! That's Monticello (thanks for the correction, nick!)
-Dave
ph...@bbs.cruzio.com
As long as we do not actually have to power the AC by electricity,
it seems, then then perhaps you could also consider using ice
from a "solar Issac' type solar ice maker. In the last
few issues of Home Power, I believe, it was covered for preserving
fish in a no-power mexican fishing village.
pH
* D. Pureheart Steinbruner Proud Morris Minor Owner since *
* KD6 CYC ph...@bbs.cruzio.com 1973. (Hey! Stop laughing!) *
* Aptos, California Yes, it still runs. *
Penelope
On 9 Jul 1997 01:04:44 GMT, ph...@bbs.cruzio.com wrote:
<>
<>As long as we do not actually have to power the AC by electricity,
<>it seems, then then perhaps you could also consider using ice
<>from a "solar Issac' type solar ice maker. In the last
<>few issues of Home Power, I believe, it was covered for preserving
<>fish in a no-power mexican fishing village.
<>pH
Could you please indicate a pointer of where to find this 'Home
Power', is it a magazine? ...But I am in Europe.
I am really interested in this solar Issac, where can I get more
details?
P.M.
Steve Spence
http://www.homepower.com
--
Steve Spence
ssp...@sequeltech.com
Http://www.sequeltech.com
Steve...@worldnet.att.net
Http://www.areaairduct.com/spence
MSMVP, MSDN, ClubIE
BetaID# 254651
ICQ 2063316
____________________________________
Penelope wrote in article <33c8e912...@news.aon.at>...
>.
>
ph...@bbs.cruzio.com
In article <33c8e912...@news.aon.at>, uxor.u...@atavit.at (Penelope) writes:
>
> Could you please indicate a pointer of where to find this 'Home
> Power', is it a magazine? ...But I am in Europe.
> I am really interested in this solar Issac, where can I get more
> details?
> P.M.
Surely.
Home Power Magazine
Post Office Box 520
Ashland, Oregon 97520 USA
phone: 800/ 707-6585
email: h...@homepower.org
web: http://www.homepower.com/hp
I searched for the issue featuring the "Solar Issac" but was unable
to locate it...I fear it is currently loaned out, therefore I cannot
give you the issue number at this time.
Fred McGalliard
Perhaps the solar cooler uses the amonia absorption refrigeration cycle,
like the old gas refrigerators. This heats up the amonia water mixture,
boild off the amonia, cools both to RT, and remixes them. The mixture is
endothermic and gets quite cold. Repeat cycle as required. Not
particularly efficient, in terms of energy, but mechanically rugged,
simple, and avoids converting the thermal energy into electricity or
mechanical motion first.
TroyE6
I would be interested in this too. Tro...@aol.com