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Airtightness Question

  • 30-01-2014 2:58pm
    #1
    ChippingSodbury
    Registered Users, Registered Users 2 Posts: 1,361 ✭✭✭


    Hi,
    What's the difference between Permeability (m3/hr.m2) and Specific Leakage (m3/hr.m2) in an Airthgitness test result?


Comments

  • #2
    sydthebeat
    Subscribers Posts: 42,171 ✭✭✭✭sydthebeat


    ChippingSodbury wrote: »
    Hi,
    What's the difference between Permeability (m3/hr.m2) and Specific Leakage (m3/hr.m2) in an Airthgitness test result?

    as both units as the same, id have to say nothing.

    we used the phrase 'air permeability' here and 'specific leakage' seems to be an american term.


  • #3
    ChippingSodbury
    Registered Users, Registered Users 2 Posts: 1,361 ✭✭✭ChippingSodbury


    There must be some difference in what is being measured even though the Units are the same. Attached is the table of results:
    Permeability: 1.961
    Specific Leakage: 5.090

    The Permeability is at q50 and the Leakage is at w50 (I presume the 50 is Pressure Diff, not sure about q and w)


  • #4
    sydthebeat
    Subscribers Posts: 42,171 ✭✭✭✭sydthebeat


    the q50 is whats applicable to irish regulations

    n50 is applicable to passive house

    w50 is another measurement method.


    see here


  • #5
    ChippingSodbury
    Registered Users, Registered Users 2 Posts: 1,361 ✭✭✭ChippingSodbury


    Good man:),
    That's exactly what I was looking for. Here's the summary table from the Appendix of the article in case anyone else is interested:

    Measurement Name Measurement is based on Unit of Measurement
    q50 Square metres of external envelope area m3/(hr.m2)
    n50 Volume of the building ACH (Air changes per hour)
    w50 Square meters of floor area m3/(hr.m2)


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