[Equest-users] Basic stuff - Infiltration

[Nick Caton]

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

 

 

 

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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