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HRV

  • 25-06-2014 9:56am
    #1
    maysville
    Registered Users, Registered Users 2 Posts: 9 ✭


    We are currently building a house and am looking for advice on HRV or On Demand Ventilation. We are heating the house with a GSHP (boreholes) and have UFH throughout.
    The floors are insualted to 140mm.
    The attic is insulated to 300mm
    The external wall construction is as follows block 100mm with 150mm pumped bead cavity and block on flat on inside which is 225mm. There is insulated slab on the inside of all external walls.
    There is thermal bridging around the windows and doors with insulated galvanised lentils.
    The house will be air tight. Our windows are timber sliding sash, double glazed and argon filled with a U value of 1.0 W/m2K.
    Proposed BER without HRV is A2.

    At the moment I'm pretty clueless about HRV and really looking for advice pros and cons re the various ventilation systems available. Any advice much appreciated.


Comments

  • #2
    sydthebeat
    Subscribers Posts: 42,172 ✭✭✭✭sydthebeat


    maysville wrote: »
    We are currently building a house and am looking for advice on HRV or On Demand Ventilation. We are heating the house with a GSHP (boreholes) and have UFH throughout.
    1. The floors are insualted to 140mm.
    2. The attic is insulated to 300mm
    3. The external wall construction is as follows block 100mm with 150mm pumped bead cavity and block on flat on inside which is 225mm. There is insulated slab on the inside of all external walls.
    4. There is thermal bridging around the windows and doors with insulated galvanised lentils.
    5. The house will be air tight. Our windows are timber sliding sash, double glazed and argon filled with a U value of 1.0 W/m2K.
    6. Proposed BER without HRV is A2.

    At the moment I'm pretty clueless about HRV and really looking for advice pros and cons re the various ventilation systems available. Any advice much appreciated.

    1. minimum standard
    2. minimum standard
    3. how much of an insulated slab? you will have to plaster the walls before installing the slabs. you would be MUCH better off increasing the cavity to 200-250mm and keeping the block inner leaf as thermal mass.
    4. you DO NOT want thermal bridging
    5. air tightness is measured. what air tightness measurement is your assessor inputting? timber sliding sash windows are notoriously difficult to make completely air tight. what is the strategy to achieve the proposed air tightness?
    6. sounds extremely spurious given the specification youve posted..... is there solar panels? wood stoves etc? what would the rating be WITH a HRV system? what efficiency has the assessor used for the heat pump when it comes to domestic hot water?


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