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Re: combining a new Heat Pump with an Existing HRV Unit

  • 05-01-2010 12:14PM
    #1
    dunie001
    Registered Users, Registered Users 2 Posts: 179 ✭✭


    Hello everyone!

    I am just wondering if there is anybody out there who had a HRV unit installed into their passive home and then realised that their home just isn't warm enough in winter...

    Basically I know someone who ONLY has a HRV system as their main heating system. They do have an electric underfloor heating system but it is obviously expensive to have running. Also they have to use an electric immersion to heat the water if the solar panels fail to meet the desired temperature.

    Anyway to get to the point...Is it possible to install a Air Source Heat Pump so that it can be combined to work alongside the existing HRV unit in the house?


Comments

  • #2
    holdfast
    Registered Users, Registered Users 2 Posts: 1,152 ✭✭✭holdfast


    Are you looking for some sort of warm air system ? HRV is not a heating system firstly. I have not come across such a fitting with a HP. I am not sure it would be a sucess at all. you would be looking for the HP liquid to heat the air??. There are HP that use the hot air from a HRV and take the heat from that and boot say the heat from the HP through the transfer method eg underfloor.

    Was the house certified ?, have you taken the temps of the build ?. Some people ideas of heating are crazy. You could expect to have the heating on more now due to the cold snap if the house was speced to irish passive standards (??) vs germany.

    Maybe you should put a nighsaving meter on and put on the heating on during this period. This should be the best possible solution, if the house was build to passive standards it will do and be half the price. If you are really still in trouble get a building professional (AT/Engineer with experience of low energy/passive builds) in to see if they can find the problem.


  • #3
    CJhaughey
    Registered Users, Registered Users 2 Posts: 14,679 ✭✭✭✭CJhaughey


    If you put an ASHP in a house and correctly size it it should provide enough heat, the HRV ventilates the house but doesn't heat it, what it does do is ensure that the energy that would normally be lost by venting warm air is recovered to some degree.
    The electric UFH is not that expensive to run but it should be be run on night storage rate which is 1/2 that of standard tariff elec.
    I would run the UFH before installing an ASHP, do plenty of baking or roasts that also makes a passive house heat up fast!


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