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<pre><big><font size="-1"><big><font face="Arial"><small>Vikram -</small></font></big></font></big></pre>
<pre><big><font size="-1"><big><font face="Arial"><small>The balance point tool looks extremely useful during the building design stages when it wpould be much more practical than a detailed energy model.
I look forward to its availability.
Do you intend it to be for commercial as well as residential buildings?
In that case it would need a way to input code-required minimum ventilation rates with some heat exchange options.
The formula Qint = M*Cp UAbld x (Tdes-Tbal) looks odd. Maybe I don't understand the units, but should that be Qint = (M/hr*Cp + UAbld) x (Tdes-Tbal)?</small></font></big></font></big></pre>
<pre><big><font size="-1"><big><font face="Arial"><small>Thanks,</small></font></big></font></big></pre>
<font size="-1"><font face="Arial"></font></font>
<pre class="moz-signature" cols="72">Dave Bryan
AIA, LEED
AmerINDIAN Architecture
Suite 100, 475 Cleveland Avenue North
Saint Paul, Minnesota, 55104 USA
651-644-1586 phone
651-644-7172 fax
<a class="moz-txt-link-abbreviated" href="mailto:dbryan@amerindian.com">dbryan@amerindian.com</a>
<a class="moz-txt-link-abbreviated" href="http://www.amerindian.com">www.amerindian.com</a>
<a class="moz-txt-link-rfc2396E" href="http://www.amerindian.com/"><http://www.amerindian.com/></a>
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Vikram Sami wrote:
<blockquote
cite="mid:55BA83825A482144A8637F9CAA981F76102A8B7A@las-mail.lordaecksargent.internal"
type="cite">
<pre wrap="">
I have been working on developing an analysis tool that extends the
building passive envelope season based on a dynamic balance point
analysis (see attached)
Vikram Sami, LEED AP
Direct Phone 404-253-1466 | Direct Fax 404-253-1366
LORD, AECK & SARGENT ARCHITECTURE
1201 Peachtree Street NE, Suite 300, Atlanta, GA 30361
Responsive Design * Technological Expertise * Exceptional Service
<a class="moz-txt-link-abbreviated" href="http://www.lordaecksargent.com">www.lordaecksargent.com</a>
Please don't print this email unless you really have to.
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10-foot high wall that's 6,815 miles long or two and a half times the
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Figures," PUBL CE-163, 2002.
-----Original Message-----
From: <a class="moz-txt-link-abbreviated" href="mailto:bldg-sim-bounces@lists.onebuilding.org">bldg-sim-bounces@lists.onebuilding.org</a>
[<a class="moz-txt-link-freetext" href="mailto:bldg-sim-bounces@lists.onebuilding.org">mailto:bldg-sim-bounces@lists.onebuilding.org</a>] On Behalf Of Chris
Balbach
Sent: Wednesday, May 07, 2008 11:27 AM
To: <a class="moz-txt-link-abbreviated" href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a>
Subject: Re: [Bldg-sim] Balance point temperature for houses
Dr. Abaza :
The TREAT (Targeted Residential Energy Analysis Tool) whole building
energy simulation software package can determine a building's balance
point (both heating and cooling) given the building description. One can
construct a 'simple' model of a typical house in about 15 minutes, and
TMY2 weather files for all 50 states are included for driving the model.
It would be pretty simple to make some parametric runs varying both
climate and envelope /infiltration to produce a range of balance point
temps. We have found both insulation levels and air infiltration
(tightness of the envelope) often have the greatest effect on the
balance point of a given structure, along with the temperature setpoints
used for heating and cooling. Significant internal gains, of course, can
also drive the balance points.
A 30 day fully functional version (free download) of the TREAT software
is available from <a class="moz-txt-link-freetext" href="http://www.treatsoftware.com">http://www.treatsoftware.com</a>
Best,
_Chris
Chris Balbach, PE, CEM
Vice President of Research and Development
124 Brindley Street, Suite 4, Ithaca, NY 14850
ph: (607)-327-1647
<a class="moz-txt-link-freetext" href="http://www.psdconsulting.com">http://www.psdconsulting.com</a>
<a class="moz-txt-link-freetext" href="http://www.treatsoftware.com">http://www.treatsoftware.com</a>
Michael Blasnik wrote:
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<blockquote type="cite">
<pre wrap="">In my experience from analyzing utility usage data with a floating
balance point, the typical effective heating balance point in US homes
</pre>
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<pre wrap="">will usually be in the range of 54F - 62F (for true heating climates).
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<pre wrap="">Newer homes are usually closer to the low end of the scale while older
</pre>
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<pre wrap="">homes are on the higher end. Electrically heated homes tend to be on
the lower end but it's not clear how much of that difference is the
effects of vintage/thermal integrity vs. lower thermostat set points
or zoning.
There may be some published results in ACEEE summer study proceedings,
</pre>
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<pre wrap="">but I can't recall any specific reference.
Michael Blasnik
----- Original Message ----- From: "Abaza Hussein" <a class="moz-txt-link-rfc2396E" href="mailto:ahussein@spsu.edu"><ahussein@spsu.edu></a>
To: <a class="moz-txt-link-rfc2396E" href="mailto:equest-users@lists.onebuilding.org"><equest-users@lists.onebuilding.org></a>;
<a class="moz-txt-link-rfc2396E" href="mailto:bldg-sim@lists.onebuilding.org"><bldg-sim@lists.onebuilding.org></a>
Sent: Tuesday, May 06, 2008 3:52 PM
Subject: [Bldg-sim] Balance point temperature for houses
</pre>
<blockquote type="cite">
<pre wrap="">Could you please help. Is there any recent data or survey about the
balance point temperature of homes in the US. Is the 65F still
applicable?
I appreciate any input.
Dr. H. Abaza
ECU
</pre>
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