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Air source to water heat pumps

rhlrhl Posts: 58Member
Has anyone installed any of these air source to water heat pumps for heating in westchester county? What brands are out there? Any recommendations, thoughts, or comments. It seems like a reasonable way to save some money

Comments

  • hot_rodhot_rod Posts: 11,785Member
    Not many choices in brands and sizes yet. Rumor has it a few more brands will be introduced at the AHR show in January.

    Dakin Altherma was supposed to be an industry leader, they pulled their products back from US distribution.

    I know of a Mestek/ Spacepak branded Solstice in upstate NY, above Utica. its has been through some sub zero conditions. On it's second winter, so far so good.

    Find more info and an Application manual here.

    http://mestek.com/hvac-metal-forming-articles.asp?id=963&type=1#.XANWIi2ZOIE
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    The magic is in hydronics, and hydronics is in me
  • rhlrhl Posts: 58Member
    sorry to bring up an old post, but, i'm curious if anyone went to this AHR show and what if anything might have shown up?
  • jumperjumper Posts: 1,355Member
    Wonder how that CO2 company is doing?
  • rhlrhl Posts: 58Member
    apparently spacepak had a demo version of there new outdoor chiller unit. it will have a variable speed compressor.
  • megharringtonmegharrington Posts: 2Member
    SpacePak Air-to-Water Heat Pumps: http://spacepak.com/hydronic-heating-and-cooling
    WaterWorks/Solstice Application Manual: http://spacepak.com/water-works
    Training Video:
    Introduced at AHR:

  • D107D107 Posts: 1,541Member
    In Westchester County, NY many residents pay 25¢ per kw, which may make air to water heat pumps problematic. Other upstate counties, where they pay maybe 15¢/kw, it's more viable. These costs include all supply, delivery, taxes, etc.
  • rhlrhl Posts: 58Member
    edited October 7
    @D107 sorry for the slow reply. That's not clear to me:

    What is the $/energy produced in each case? well, 1 therm is ~ 30 kWh worth of energy, and in westchester it's about $2.50 per therm. Assuming a boiler has a COP of 1 (i.e. it operates at 100% efficiency), that's 8.3 cents per kWh. Now, on the other hand, the COP of a heat pump in westchester (whever the average wintertime temperature is 45 degrees, min is 0, and at least 95% percent of the time it's above 10 degrees), is over 3.

    So for each .25 dollar, we get over 3 kwhs, which is magically: 8.3 cents, which is about the same. The reason for this? The price of electricity is exactly 3 times the price of gas on a per joule basis, so whenever we can use electricity to make at least 3x the heat, we are outperforming our gas counterparts.
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