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Heat pump question - Air vs. Ground

Last Post 24 Jan 2010 01:50 PM by geodean. 27 Replies.

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heatoftheearth User is Offline

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Posts:113

11 Jan 2010 03:10 PM
TG mainstream eng answer was that you needed 608 to handle R410A http://www.epatest.com/faq/R410A/#G3 I think they are misinformed as was I, the EPA's site says that you do not need any cert. for R410A (at this time) http://www.epa.gov/Ozone/title6/phaseout/technicians_contractors_faq.html

Palace Geothermal User is Offline

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Posts:1609

11 Jan 2010 08:33 PM
Posted By arkieoscar on 01/11/2010 7:31 AM As I have warned others before, this forum is not DIY friendly. This is the most DIY friendly forum that I know of. Granted there is some push back when a poster wants to denigrate those who give so freely of their time and knowledge here. If you know of some forum more DIY friendly, please post here so we know where to send those who think we don't like them.

Dewayne Dean <br>www.PalaceGeothermal.com<br>Why settle for 90% when you can have 400%<br>We heat and cool with dirt!<br>visit- http://welserver.com/WEL0114/- to see my system

TechGromit User is Offline

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11 Jan 2010 08:54 PM
Posted By vhehn on 01/11/2010 1:59 PM "3. The COP for a ASHP goes to Sh*t when the temperatures drop below freezing, if you believe your getting good COP at 17 degrees, you fooling yourself. When the temperature drops below freezing, your far better off just using electric resistant heat. " nonsense. modern heat pumps work much lower than freezing temp. my heat pump will keep up heating the house into the hi teens before it needs aux heat and even then it only needs aux heat part time. I never said they don't work, I said there efficiency suffers. My ASHP also works fine at 20 degree and I don't even have an electric resistance AUX on my system. But it runs constantly, combined with the defrost cycles, I can't believe it's very efficient.

joe.ami

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11 Jan 2010 09:47 PM
Posted By joe.ami on 01/10/2010 8:47 AM Posted By mustbfraud on 01/09/2010 4:17 AM I keep thinking I am missing something, but is that all there is to it? (It was so easy its scary...) Honesty would have made this interesting for all of us. Hostility once you were exposed makes it a waste of time for all who contributed. Most of the other pros here suffer BS a tad better than me and are to be applauded for their Christian patience. j

Joe Hardin www.amicontracting.com We Dig Comfort! www.doityourselfgeothermal.com Dig Your Own Comfort!

denwayne

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Posts:3

20 Jan 2010 11:26 PM
Just ran across this post. I've been trying to find info on an air + small geo sync system called "dual source heat pump" that seemed promising, but may have gone the way of the dino. Best I can figure, it put a water heat exchanger on each side of the air exchange condenser coils linked to a pump to run only when the compressor is on. Would this not pre and post cool refrigerant in summer(warming in winter), reducing pressures and load on the system, therefore making a more efficient (especially at the temp extremes) system? What happened to the original description of this guy's system? What is "Kilroy was here"? Is there anything like this out there? Old info indicates a loop of 30-60 ft /ton would be adequate when coupled w/air assist (one well instead of 4 for a 4 ton geo unit). Thanks for any insight or info.

joe.ami

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21 Jan 2010 08:54 AM
Posted By denwayne on 01/20/2010 11:26 PM Just ran across this post. I've been trying to find info on an air + small geo sync system called "dual source heat pump" that seemed promising, but may have gone the way of the dino. Best I can figure, it put a water heat exchanger on each side of the air exchange condenser coils linked to a pump to run only when the compressor is on. Would this not pre and post cool refrigerant in summer(warming in winter), reducing pressures and load on the system, therefore making a more efficient (especially at the temp extremes) system? What happened to the original description of this guy's system? What is "Kilroy was here"? Is there anything like this out there? Old info indicates a loop of 30-60 ft /ton would be adequate when coupled w/air assist (one well instead of 4 for a 4 ton geo unit). Thanks for any insight or info. Original poster deleted his blogs. He apparently found law and honesty both too confining in the discussion. You'll find some of his content in my posts. I've not heard of the type of system you mention but it sounds like it could have some merit. Keep us posted. J

Joe Hardin www.amicontracting.com We Dig Comfort! www.doityourselfgeothermal.com Dig Your Own Comfort!

Alex_in_FL User is Offline

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Posts:96

24 Jan 2010 12:07 PM
Yes Dewayne it will. Dual source units have been around for decades. A now defunct company called Global Engergy Solutions had a patent on these. Their old website is still up (www.gegsolutions.com). I contracted them years ago and they said it added about 2 SEER or so to an ASHP unit. They added a small loop with a couple of shallow wells jetted in, a small tank, antifreeze to the closed loop, a small heat exchanger in line with the air exchanger (I think that is right), and had a small pump - something like 1/40th of a HP if I recall. I think you can find more info about dual source units if you type the following in google: GSHP Fort Hood Post Office GEG Best of luck. Alex

Palace Geothermal User is Offline

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24 Jan 2010 01:50 PM
There is a Dewayne who has posted here for a long time and now a new guy ...denwayne

Dewayne Dean <br>www.PalaceGeothermal.com<br>Why settle for 90% when you can have 400%<br>We heat and cool with dirt!<br>visit- http://welserver.com/WEL0114/- to see my system