ASHRAE Journal - September 2013 - 10
Letters
to assume no leakage at all. Having said that, from the
perspective of construction, experience has told me
that it is not worth the effort to go beyond 2 to 3 ach@50
in residential construction. If you actually follow the
prescriptive requirements of the building code and
locate your ductwork inside the building air control
layer, you achieve this readily.
In practice this means getting rid of the big holes.
The EPA’s Energy Star program listed these big holes
under its “Thermal Bypass Inspection Checklist” that
eventually found its way into the International Energy
Conservation Code. Energy Star got its list from the
Department of Energy Building America Program in
the late 1990s
Building America got it from tract
builders in Chicago who were dealing with comfort issues and freezing
pipes in the early 1990s. I brought it to
Chicago from Canada in the late 1980s
where it came from Canada’s R-2000
program—which was originally based
on the Denver Metro Program in
the late 1970s who got it from some
heat pump salesmen in Arkansas. So
blame Arkansas. Anyway, get the big
holes and stop. Then don’t over ventilate and don’t suck.
In commercial construction I think
that 2 L/s per m2 at 75 Pa is a reasonable target. This is based on the “get
rid of the big holes and don’t do stupid things” principle. To me it does
not make sense to go beyond that and
then way over ventilate. But sense has
very little to do with what is going on.
Joseph Lstiburek. Ph.D., P.Eng., Fellow ASHRAE,
Somerville, Mass.
District Energy Plants
www.info.hotims.com/44636-47
10
ASHRAE JouRnAl
ashrae.org
Septem ber 2013
July’s Energy Modeling column,
“District Energy Plants,” describes
some of the specifics related to
energy modeling for central plants in
LEED V3. The author may already be
aware of the following LEED compliance strategy, but it was not mentioned in the article, and I think it
should prove helpful to readers.
The article appears to focus primarily on the “Treatment of District
or Campus Thermal Energy in
LEED V2 and LEED 2009—Design &
Construction” supplemental document. One of the problems with using
ASHRAE Journal - September 2013
Table of Contents for the Digital Edition of ASHRAE Journal - September 2013
Contents
ASHRAE Journal - September 2013 - Cover1
ASHRAE Journal - September 2013 - Cover2
ASHRAE Journal - September 2013 - 1
ASHRAE Journal - September 2013 - 2
ASHRAE Journal - September 2013 - Contents
ASHRAE Journal - September 2013 - 4
ASHRAE Journal - September 2013 - 5
ASHRAE Journal - September 2013 - 6
ASHRAE Journal - September 2013 - 7
ASHRAE Journal - September 2013 - 8
ASHRAE Journal - September 2013 - 9
ASHRAE Journal - September 2013 - 10
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ASHRAE Journal - September 2013 - 12
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ASHRAE Journal - September 2013 - 20
ASHRAE Journal - September 2013 - 21
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ASHRAE Journal - September 2013 - 28
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ASHRAE Journal - September 2013 - Cover3
ASHRAE Journal - September 2013 - Cover4
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