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HRV and air flow around the house

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    #62
    ht9zni1gs28crp
    Closed Accounts Posts: 1,011 ✭✭✭ht9zni1gs28crp


    delfagio wrote: »
    Sorry, just going to throw another query out here in relation to HRV....

    So HRV system basically gives fresh air to all living spaces, bedrooms etc. So let's say it's 23degree inside and 15degree outside.

    So essentially the 15degree outside air is warmed up to say 90% of what the indoor temp is. So say the fresh air coming in warmed up to approx 20degree.

    Then would I be right in saying that in the DEAP calculations for the living space size makes no difference as basically the entire house is been warmed by the HRV to approximately the same temperature throughout the whole house. Does that make sense.

    So upstairs stats can be set to 18 or 19degree but realistically if it's 20degrees fresh air coming back into the house through the HRV supply ducts, then this warm fresh air is been supplied to all living spaces.

    Yes, probably over egging realistically what the HRV can recover and put back in. For example the HRV will automatically bypass if internal temps being recovered are in excess of say 21deg(or your choice). In the coldest months where outside temps are say 5deg the HRV comes into its own, putting in say 15-17deg of warm fresh air.

    So that then helps your decision of the trade off between the value of any heating requirement upstairs at all. Realistically sleeping quarters should be greater than 18-19deg for comfort.

    So some designs can get away with it.....most passive houses wouldn't require heating upstairs. The whole house balance takes care of this....


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    #63
    BarneyMc
    Registered Users Posts: 1,504 ✭✭✭BarneyMc


    BarneyMc wrote: »
    I think I've key holes so that might work also!

    Seriously, with the keyhole and the inevitable gaps surrounding the entire door, is there really a need to deliberately leave a gap under the doors?


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    #64
    sydthebeat
    Subscribers Posts: 41,485 ✭✭✭✭sydthebeat


    BarneyMc wrote: »
    Seriously, with the keyhole and the inevitable gaps surrounding the entire door, is there really a need to deliberately leave a gap under the doors?

    Irregardless of ALL of this... doors are opened internally at such a frequency as to allow for complete air movement throughout.

    its really a non-issue IMO


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    #65
    rampantbunny
    Registered Users Posts: 907 ✭✭✭rampantbunny


    sydthebeat wrote: »
    Irregardless of ALL of this... doors are opened internally at such a frequency as to allow for complete air movement throughout.

    its really a non-issue IMO

    I'm leaning towards this thinking also, but there can be doors that you inevitably just don't open for long periods for whatever reason; maybe there's a door into the attic you rarely visit, or the 'good' sitting room which is locked to stop kids getting at. Put a gap under those and leave the rest as standard if you think the gap will be noticeable.


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