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Heat pump

  • 09-06-2014 8:04pm
    #1
    PAL100
    Registered Users Posts: 17 ✭


    I am working on a proposed house at the moment circa 2300 ft sq . All elements exceed regs by a lot however it fails on renewables. There is a heat pump 321% HW cylinder within pump circa 150% efficient. Anybody try meet renewables with just a heat pump. This is air/water, no solar panels .
    Any help /suggestions appreciated
    Thanks


Comments

  • #2
    froshtyv
    Registered Users, Registered Users 2 Posts: 225 ✭✭froshtyv


    PAL100 wrote: »
    I am working on a proposed house at the moment circa 2300 ft sq . All elements exceed regs by a lot however it fails on renewables. There is a heat pump 321% HW cylinder within pump circa 150% efficient. Anybody try meet renewables with just a heat pump. This is air/water, no solar panels .
    Any help /suggestions appreciated
    Thanks

    What are you using to heat the house? UFH or rads?

    This will have an impact on the results


  • #3
    sydthebeat
    Subscribers Posts: 41,915 ✭✭✭✭sydthebeat


    PAL100 wrote: »
    I am working on a proposed house at the moment circa 2300 ft sq . All elements exceed regs by a lot however it fails on renewables. There is a heat pump 321% HW cylinder within pump circa 150% efficient. Anybody try meet renewables with just a heat pump. This is air/water, no solar panels .
    Any help /suggestions appreciated
    Thanks

    air to water heat pumps do not have very high efficiencies.

    if its 321% efficient for space heating its actually only around 1.28 return for every 1 unit inputted.
    also, depending on your system, its efficiency for hot water is probably only around 150%... which means in effect its only around 0.6 return for every 1 unit inputted.

    so its not very surprising that its not meeting the renewables.

    caveat: im in no way saying this is a logical conclusion, nor am i condoning the maths behind it. The anomaly in the maths, when it comes to heat pumps, is well documented.


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