Hi Hakan, Nope haven't seen any breakthroughs recently. I agree that in a commercial application ammonia will work well. Even home systems, but like what was said put the unit outside so if any ammonia leaks the danger is lowered (except for the neighbors ..... ;-) ). I think that using PV and a sunfrost would be a better option. Just my .02.
BTW, I have an old (really old) popular science article of someone using ethanol in a dessicant cycle air conditioning system. It's burried and would have to REALLY look for it as it is in paper. It was a great application but I think the inventer was killed somehow (all you conspiracy theorists chime in here ....) and it never got off the ground. I probably won't look for it as I have been too busy recently and I forgot where I "filed" it (really loose term here). Anyhow, there is/was a company a few years ago that was about to produce a PV/battery/sterling cooler for 3rd world applications (mostly vaccines) and was a really great all in one design. I would also have to look for the link to that ..... (weblink burried). James Slayden On Wed, 26 Feb 2003, Hakan Falk wrote: > > Dear Kirk, > > Do not be impatient, maybe James have something to tell us. What > I have seen is that this very old technology is very useful in some > niche applications. To compete in simplicity, costs etc. with the > air conditioning suggested, I did not thought so. In that sense I do > not see Sterling as "ready to use technology". On the other hand, > it was a long time ago since I looked closer and maybe I missed > some recent large break trough. > > Hakan > > At 12:46 PM 2/26/2003 -0700, you wrote: > >Still waiting to see a Stirling that is as efficient as other cycles > across > >the same delta T. > > > >Kirk > > > >-----Original Message----- > >From: Hakan Falk [mailto:[EMAIL PROTECTED] > >Sent: Wednesday, February 26, 2003 12:10 PM > >To: biofuel@yahoogroups.com > >Subject: Re: [biofuel] Solar powered air conditioning that really works > >with temps as low as 80C (176F) > > > > > > > >James, > > > >If you can show me how the sterling will run from 80 degree Celsius > >solar heated warm water, I think we have an absolute winner. If > >then the compressor would work with a gas that is not dangerous or > >contribute to Global warming. A fantastic solution that definitely have > >my support. > > > >Hakan > > > > > >At 10:10 AM 2/26/2003 -0800, you wrote: > > >Granted it has been around a long time and still used in commercial > > >refridgeration, but I think that the utilization of a sterling cycle > > >compressor is a better way to go. Yes, ammonia refridgeration could > be a > > >stepping stone, but again the concentrated ammonia is highly > poisonous. > > >Dunno, whats the lessor of two evils. > > > > > >James Slayden > > > > > >On Wed, 26 Feb 2003, Hakan Falk wrote: > > > > > > > > > > > James, > > > > > > > > Maybe I am starting to get old, but until around 35 years ago it > was the > > > > dominant method in refrigerators. It is also a very common in > nature and > > > > if > > > > I am not wrong it is to consider as a biogas, at least when I was > young > > > > and > > > > worked with horses. Concentrated it is dangerous, but not more than > some > > > > chemicals you use for making biodiesel. From an energy saving view, > a > > > > solar > > > > driven air conditioner would be great product. It is built on > "ready for > > > > use" technologies with some design changes. Could be a winner and > >"silver > > > > bullet" products. Relatively short implementation cycle, easy to > > > > manufacture, easy dimensioning, easy install and familiar > technology. > > > > Well > > > > worth to investigate in more detail. The key was to lowering the > demand > > > > on > > > > operating temperature and it seems that they found one good > solution to > > > > this. > > > > > > > > Hakan > > > > > > > > At 03:39 PM 2/25/2003 -0800, you wrote: > > > > >ammonia cooling is dangerous folks, be careful. > > > > > > > > > >On Tue, 25 Feb 2003, Kris Book wrote: > > > > > > > > > > > It seems like most houses are well enough insulated that > > > > > > they only need cooling when the sun is shining brightly > > > > > > but, refrigeration of food and even greenhouses could > > > > > > benefit greatly from using waste heat to power this system > > > > > > during periods of low direct sunlight. > > > > > > > > > > > > kris > > > > > > > > > > > > > > > > > > --- David Wood <[EMAIL PROTECTED]> wrote: > > > > > > > on the same though.. why not use the waist heat from a > > > > > > > veggie diesel > > > > > > > co-generator for the heat source of this type of system. > > > > > > > > > > > > > > david > > > > > > > > > > > > > > [EMAIL PROTECTED] wrote: > > > > > > > > > > > > > > > > > > > > > > > http://members.aon.at/solarfrost/main.html > > > > > > > > > > > > > > > > > > Yahoo! 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