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Do rads work with air to water????

  • 26-11-2012 10:09am
    #1
    JD6910
    Registered Users Posts: 227 ✭✭


    hi all,

    Any thoughts on using air to water heat pump with the low temp high efficency rads????

    i am aware that heat pumps do not work well with "normal" rads.


Comments

  • #2
    JD6910
    Registered Users Posts: 227 ✭✭JD6910


    Anyone?????????????????????????????


  • #3
    kieranhr
    Registered Users, Registered Users 2 Posts: 131 ✭✭kieranhr


    High efficiency rads with underfloor = more efficient than normal rads, but still not as efficient as underfloor heating. The air-to-water works best when you have a high external temperature and you are trying to generate low temperature water. Normal radiators will run around 60 degrees, underfloor heating around 25 degrees, and low-temp radiators somewhere in between - say around 40 degrees. There's quite a bit of play on all those numbers, but the point is that the hotter you need the water, the more energy the heat pump is going to use. To put actual figures on the costs, you'll need to ask your BER assessor or the heat pump manufacturer.


  • #4
    sydthebeat
    Subscribers Posts: 41,863 ✭✭✭✭sydthebeat


    yes

    Look for low surface temperature (LST) type such as Jaga Tempo type.

    as kieranhr says they are less efficient emmiters than UFH, but better than normal rads.

    They are a good compromise IMHO


  • #5
    JD6910
    Registered Users Posts: 227 ✭✭JD6910


    thanks guys for the input.

    would the rads be large to allow for the low temp???

    any other brands recommended??


  • #6
    sydthebeat
    Subscribers Posts: 41,863 ✭✭✭✭sydthebeat


    JD6910 wrote: »
    thanks guys for the input.

    would the rads be large to allow for the low temp???

    any other brands recommended??

    you need to get the system designed.... either by an independent M+E designer, or by the suppliers in house team.

    The whole idea is that heat output creates a comfortable house, anything less is not fit for purpose.


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  • #7
    JD6910
    Registered Users Posts: 227 ✭✭JD6910


    anyone have any thoughts on my potential running costs for the year????

    hoping to achieve a B1 in the house.

    all expierneces of potential running costs in similar installations appreciated.


  • #8
    sydthebeat
    Subscribers Posts: 41,863 ✭✭✭✭sydthebeat


    JD6910 wrote: »
    anyone have any thoughts on my potential running costs for the year????

    hoping to achieve a B1 in the house.

    all expierneces of potential running costs in similar installations appreciated.

    http://www.boards.ie/vbulletin/showthread.php?t=2055263818


  • #9
    JD6910
    Registered Users Posts: 227 ✭✭JD6910


    sydthebeat wrote: »
    http://www.boards.ie/vbulletin/showthread.php?t=2055263818

    thanks for the link sydthebeat.

    can i suggest that we do an update survey???:o:confused:

    it would be great to get peoples latest experiences.;)

    is this something you can do dare i ask!!!!


  • #10
    sydthebeat
    Subscribers Posts: 41,863 ✭✭✭✭sydthebeat


    That survey is a "live" thread..... we cannot force people to post into it ;)


  • #11
    JD6910
    Registered Users Posts: 227 ✭✭JD6910


    no probs sydthebeat.

    pity more people dont update their expierneces. can you "refresh" the thread to "encourage" people to post!!!!


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  • #12
    sheff the ref
    Registered Users Posts: 618 ✭✭✭sheff the ref


    Rads provide instant heat. Underfloor maintains a temperature.

    Rads are generally run on demand at peak electricity times. Originally the heatpump did most of its work on night rate electricity for underfloor (not sure what the story is now with weather compensating controllers).

    Obviously the size of the house has a bearing on things. E.g the cost difference between underfloor running costs and rads running costs would be far greater in a 3500 square foot house than in an 1800 square foot house


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