[Equest-users] Basic stuff - Infiltration

[lawrence Lile]

Good ol ASHRAE Fundamentals!  Why didn't I think of looking there?  Thanks!




On Mon, Aug 8, 2011 at 11:36 AM, Nick Caton <ncaton at smithboucher.com> wrote:

> Hi Lawrence,****
>
> ** **
>
> My copy of ASHRAE Principles of HVAC includes a table (5-1) excerpted from
> ASHRAE Fundamentals, 2001 (Table 7, Ch 28).  This table provides air change
> rates as a function of subjective envelope airtightness (“tight” / “medium”
> / “loose”) and as a function of the outdoor design temperature.  Upon
> reviewing the referenced Fundamentals chapter, I learned this table is built
> from research surveying residential homes of various vintages, so it helps
> to know that these are “tight” to “loose” residential constructions.  ****
>
> ** **
>
> In any case, I’ve used and cited this resource before when modeling
> infiltration and calculating sizing loads for non-residential projects as
> well.  I’ve searched, but have yet to come up with an equivalent table based
> on surveying and measuring commercial constructions from a
> subjective/objective standpoint… That might be handier, but in the meantime
> this is a good tool for “converting” your subjective observations into the
> right ballpark.  ****
>
> ** **
>
> ~Nick****
>
> ** **
>
> [image: cid:489575314 at 22072009-0ABB]**
>
> * *
>
> *NICK CATON, P.E.***
>
> SENIOR ENGINEER****
>
> ** **
>
> Smith & Boucher Engineers****
>
> 25501 west valley parkway, suite 200****
>
> olathe, ks 66061****
>
> direct 913.344.0036****
>
> fax 913.345.0617****
>
> www.smithboucher.com* *****
>
> ** **
>
> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *lawrence Lile
> *Sent:* Sunday, August 07, 2011 12:50 PM
>
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] Basic stuff - Infiltration****
>
> ** **
>
> In building modeling programs one always has to provide precise values for
> infiltration.  In the real world, I will know one of two things:  almost
> nothing (The building appears to be kinda leaky with old windows), or I will
> have a blower door test done at a specific pressure.  How do I convert
> subjective ("kinda leaky") or objective (Blower door test) leakage into
> numbers that make sense in the program?  Is there a guide one can use?  **
> **
>
>  ****
>
>  ****
>
> --Lawrence****
>
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