planning:airtight_construction:general_principles:leakage_problems

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planning:airtight_construction:general_principles:leakage_problems [2015/05/09 21:30] – [Requirements for Airtightness within Passive Houses] wolfgangfeist@googlemail.complanning:airtight_construction:general_principles:leakage_problems [2015/05/09 21:34] – [Requirements for Airtightness within Passive Houses] wolfgangfeist@googlemail.com
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   * the energy conservation by these measures is significant. The influence on peak load is even higher (because of the changing weather conditions). Therefor, building really airtight significantly reduces the risks of missing performance. This is one of the reasons, why there is no "performance gap" with passive houses - but there seem to be such problems within other ambitious low energy projects. Yes, it's difficult to fully track air infiltration losses and to exactly calculate their influence on the performance. But: The best and easiest (and cheapest) way to cope with this is to build the envelope tight - and avoid all these problems.     * the energy conservation by these measures is significant. The influence on peak load is even higher (because of the changing weather conditions). Therefor, building really airtight significantly reduces the risks of missing performance. This is one of the reasons, why there is no "performance gap" with passive houses - but there seem to be such problems within other ambitious low energy projects. Yes, it's difficult to fully track air infiltration losses and to exactly calculate their influence on the performance. But: The best and easiest (and cheapest) way to cope with this is to build the envelope tight - and avoid all these problems.  
   * there is an additional benefit for better comfort by avoiding drafts. Persons seem to be especially sensitive to cold drafts (see ISO 7730) - and there are two important causes for such drafts: first, an untight envelope; and second, cold surfaces.   * there is an additional benefit for better comfort by avoiding drafts. Persons seem to be especially sensitive to cold drafts (see ISO 7730) - and there are two important causes for such drafts: first, an untight envelope; and second, cold surfaces.
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 +It's a bad idea to think, that you'll gain anything from alleviating the airtightness requirements. The only result will be, that yo'll get higher risks for bad performance. On the other side, it's not much an effort to learn how to deign and to build really airtight.
  
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 [[planning:airtight_construction:general_principles|]] [[planning:airtight_construction:general_principles|]]
planning/airtight_construction/general_principles/leakage_problems.txt · Last modified: 2019/05/16 10:46 by cblagojevic