Ground source Heat Pump

don_167

to 17.2 eer and cop at 5.9.Just keep in mind the ones I've seen come in 3 ton,then 5 ton,then 7 ton.

It must be a very tight home with water temps that low on
stapleup.

Wayco Wayne_2

What kind of

water temperatures can be genrated by a ground source heate pump. I need 120 and below for a radiant floor system. Could a water to water ground source provide the temps needed???? WW

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GMcD

Geo heat

Yes, many water to water heat pumps can get the 120F water, but you are on the ragged end of performance and efficiency. WW heat pumps have higher efficiencies at lower heating water temps in the 95F-100F range. Make sure you do an energy balance on the system and application- are you drawing more heat out of the ground than you are putting back in, based on your soil conductivity tests? "Heating only" geo can freeze your system and degrade performance after a couple seasons if the conductivity is not good.

Glenn Harrison_2

I had a customer (now former employer)

that his enite house was Geothermal HP's, The basement of about 1800 sq. ft. was all radiant heat, desinged to run at a max of 120º water temp, and it could easily over heat the basement. This was done using one 3 ton (36,000 BTU) and one 5 ton(60,000 BTU) units, one at each end of the house. Each unit also did floor warming on the first floor in the bathrooms. So less than 120ºF should be no problem. But also keep in mind that 120ºF is your maximum, because anythin over about 125ºF will cause the refrigerant high pressure switch to trip and lockout the unit. Also, from what I understand, a storage tank is also key to a geothermal radiant system. Also, if you are using a ground loop, make sure you size the unit for the lowest entering water temp from the loop.

Paul Rohrs

Geo-thermal

We have done several geo-thermal jobs. Entering water
temperature into the unit is a major factor on what type of secondary temps you can achieve. On a mild day here in the midwest (30's) I was seeing what types of temps it would max out at and I recorded temps of 133F on the "boiler-loop". Again with primary secondary and injection mixing or proportional mixing, I think you can achieve your setpoint temp. I think the buffer tank should only be used as an extension of the primary loop but it is required to prevent short cycling. I believe it's right out of Siggys "Precision Hydronics".

My design temp needed for this church job was 101F. It was about 4500 sq/ft of radiant SOG broken down into 3 zones. It works really well. My only question (as with condensing boilers) is how long will this unit last?

I attached the picture of mechanical I drew up for the installer. I don't have any actual pics right now, but they would be easy to get. Of course I turned off boiler protection for the heat-source, but the reset-temp really helps on multiple levels with the limitations of the geothermal and high temps.

Regards,

PR

Biggerstaffradiantsolutions.com

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Wayco Wayne_2

If I sell

Joist trak plates I can get the water temp down to 90 degrees. The 122 was for staple up. The customer is smart and nsulating very well. I know Air side heat pumps are getting pretty high SEER's. How do ground source heat pumps compare on the cooling side and the heating side??? Thanks. WW

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