Heat pump efficiency testing(temp = pressure) - http://www.hvacmechanic.com/ Forums
Original message
| cyberbeagle
 |  "Heat pump efficiency testing(temp = pressure)"
, posted Sat 9 Feb 16:47  
I'm no expert here, but I have an idea on how I could possibly monitor my system's efficiency. You gurus would know more...
I was wondering and thinking creatively here. On my geothermal, I hooked up a thermometer on the entering well water copper pipe to monitor water temp. Could I do the same and put the probe (Rated for max 160F) on the refrigerant coil in the blower or right at the geo? Would getting the temp of the R410A give an idea if its set correctly? temp = pressure? In other word, by checking temp, I can get an idea of the pressure, which in turn can give me an idea if the charge is correct or has to be tweaked for more efficiency.
Thanks,
Dre
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Replies:
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| justsomeguy
| "Re(1):Heat pump efficiency testing(temp = pre" , posted Sat 9 Feb 16:50
What you want to check is superheat and subcooling temps. This works best in the ac mode. Don't know where your at but to check the ac properly it has to be at least 70 degrees outside,
BillyBob
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| | static
| "Re(2):Heat pump efficiency testing(temp = pre" , posted Sat 9 Feb 19:56
On a geothermal system IMO you'll do better to monitor the water side for performance rather than the refrigerant side.
Here, Cyberbeagle. Try this. It's a pdf.
Climatemaster Info
It's from ClimateMaster but the same would be applicable regardless of brand. I think the most relevant info as to wha tyou're looking for would be the formulas at the bottom of page 11.
If you can perform these calculations, they would tell you exactly what you want to know, but you'd need to have a set of P/T ports ("peet ports") on the incoming and outgoing water lines and a way to measure temperature and pressure rise / drop from these ports, and also the performance data from the manual for your unit (or comparable) to compare to.
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