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6588RE: [hreg] Solar powered A/C

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  • Robert Johnston
    Jul 10, 2007

      That’s an interesting system!  I took a look at the webpage. 

      Does your experience jibe with their claims on energy/cost savings?  i.e., what % drop in summer kwh usage did you see vs. whatever you had in there before (what SEER was the old system?)?


      When you made your decision to purchase this, did you also look at geothermal heat pumps?  What made you decide to go this route instead?  (This conceptually seems a lot like the geothermal heat pumps in the sense of using water in the cooling cycle, but this system does not have a heating cycle for winter).


      Did the system cost a lot more than conventional units, and do you believe it has paid for itself in savings?



      Robert Johnston


      From: hreg@yahoogroups.com [mailto: hreg@yahoogroups.com ] On Behalf Of David Power
      Sent: Monday, July 09, 2007 11:05 PM
      To: hreg@yahoogroups.com
      Subject: RE: [hreg] Solar powered A/C



      Take a look at http://www.thermalf low.net/ for a look at an efficient use a of water cooled residential ac. They are made in Austin .

      I’ve had one on my house for several years and have been very pleased with the performance. They do have a de-superheater option as well that is used as a pool and domestic hot water system.





      From: hreg@yahoogroups. com [mailto: hreg@yahoogroups. com ] On Behalf Of Kevin Conlin
      Sent: Monday, July 09, 2007 9:50 PM
      To: hreg@yahoogroups. com
      Subject: RE: [hreg] Solar powered A/C


      Hi Paul,  I’m afraid that’s over my head.  I’m familiar with the technology, but can’t explain it chemically, perhaps one of the smarter engineers can explain it.  The absorbtion chillers do not have conventional compressors, the heat is used to drive a chemical process using lithium bromide where I think it is vaporized, then used to absorb heat as the reaction reverses. It is a chemical phase change process, not a vapor/compression process.


      With regard to using water to cool the Freon in a conventional AC unit, I think those do exist, they are called de-superheaters and they make domestic hot water by pre-cooling the Freon before it enters the coils.  The problem is there is more hot water than the household can use, so it’s effect is limited. A Houston AC generates more hot water than even a swimming pool can absorb, even using spray bars for night time cooling, a NASA engineer tried it some years ago, and as he put it, he had the largest crab-boil in Houston !


      Sorry I don’t have time to Google any of this, I’m just getting back from vacation to several hundred e-mails and going from memory.


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