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<DIV dir=ltr align=left><SPAN class=593233521-28092006><FONT size=3>The attached
report contains number of inaccuracies, which need to be addressed for anyone
that wants to make use of it. First of all, "Shade Coefficient" is
non-existing expression. There used to be something called "Shading
Coefficient", which was the ratio of transmitted solar gain through
a glazing in question and solar gain through the double strength single
glass. This quantity is long abandoned, because it was true only for
normal incidences, it was somewhat OK for of normal angles of mostly clear
glazing and is grossly inaccurate for spectrally selective low-e coated glass,
which is starting to dominate market. Concept of Shading Coefficient was
so problematic that ASHRAE decided to drop it completely almost 10 years
ago. I was the chair of handbook subcommittee which was in charge
of fenestration chapter when this happened. As a transition, we
provided some crude conversion from SC to SHGC, with the caveat that is only a
CRUDE approximation for off normal angels and is to be used for measured SC data
that existed earlier. </FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=593233521-28092006><FONT
size=3></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=593233521-28092006><FONT size=3>Then, report
says that "Shade Coefficient" is calculated using NFRC and ASHRAE
approach. Not only that NFRC nor ASHRAE do not use Shade Coefficient or
Shading Coefficient, but there is no approved procedure at NFRC to calculate
performance of windows with shading devices. WINDOW program, which is used
by NFRC to rate windows, in its approved version does not deal with shading
devices either. There is research version 6.0 (downloadable from
windows.lbl.gov), which can model SHGC of shading devices, including venetian
blinds and woven shades, but that is not approved by NFRC yet (and it wont for
another year or so, until it is tested and validated fully).</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=593233521-28092006><FONT
size=3></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=593233521-28092006><FONT size=3>Finally,
report shows how darker shades increase peak cooling load without ever
mentioning what is the SHGC of the window assembly, how is that calculated, or
what are the solar optical properties of the shade itself, so it is really
difficult to corroborate why would cooling load be higher.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=593233521-28092006><FONT
size=3></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=593233521-28092006><FONT size=3>Is there any
technical documentation of the Carrier HAP program that would detail assumptions
and algorithms used? One would expect for reputable company like Carrier
to be more careful with its "facts" and claims.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=593233521-28092006><FONT
size=3></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=593233521-28092006><FONT size=3>Charlie
Curcija</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=593233521-28092006> </DIV>
<DIV dir=ltr align=left>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT face=Arial size=2>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT size=2>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT
size=3>-------------------------------------------------------------------</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT size=3><SPAN
class=796010011-27052006>D. </SPAN>Charlie Curcija</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT
size=3><STRONG>Design</STRONG>Builder Software</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT size=3>18
Tanglewood Rd.</FONT></SPAN></DIV>
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01002</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT
size=3></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT size=3>Tel: (413)
256-4647</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT size=3>Fax: (413)
256-4823</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT size=3>cell: (413)
575-3487</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT size=3>email:
</FONT><A title=mailto:curcija@designbuildersoftware.com
href="mailto:curcija@designbuildersoftware.com"><FONT
size=3>curcija@designbuildersoftware.com</FONT></A></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT size=3>web: <A
href="http://www.designbuildersoftware.com/">http://www.designbuildersoftware.com</A></FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=453152915-31052005></SPAN> </DIV>
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<DIV dir=ltr align=left><SPAN class=453152915-31052005><SPAN
class=453152915-31052005><FONT size=2><STRONG><EM><FONT size=3>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><SPAN
class=453152915-31052005><FONT size=2><STRONG><EM><FONT size=3><SPAN
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class=453152915-31052005><STRONG><EM><FONT face=Arial><FONT size=3><SPAN
class=640374411-20062006>S</SPAN>upport open document format as the <SPAN
class=375302716-12112005>best </SPAN>way to assure <SPAN
class=000590211-17112005>full compatibility<SPAN class=948042211-08122005> and
interoperability</SPAN></SPAN><SPAN
class=640374411-20062006>!</SPAN></FONT></FONT></EM></STRONG></SPAN></SPAN></FONT></SPAN></SPAN></FONT></EM></STRONG></FONT></SPAN></SPAN></FONT></EM></STRONG></FONT></SPAN></SPAN></FONT>
</EM></STRONG></FONT></SPAN></SPAN></FONT></EM></STRONG>
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<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT size=2>STATEMENT OF
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<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<B>From:</B> BLDG-SIM@gard.com [mailto:BLDG-SIM@gard.com] <B>On Behalf Of
</B>Stirling Walkes<BR><B>Sent:</B> Thursday, September 28, 2006 12:36
PM<BR><B>To:</B> BLDG-SIM@gard.com<BR><B>Subject:</B> [BLDG-SIM] effect of
window blinds on solar heat gain<BR><BR></DIV>
<DIV></DIV>
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Alec,</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>Attached is a link to a Carrier HAP document regarding this issue.</DIV>
<DIV> </DIV>
<DIV><A
href="http://www.xpedio.carrier.com/idc/groups/public/documents/marketing/hap_ehelp_009.pdf?SMSESSION=NO">http://www.xpedio.carrier.com/idc/groups/public/documents/marketing/hap_ehelp_009.pdf?SMSESSION=NO</A></DIV>
<DIV> </DIV>
<DIV>Regards,</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>V. Stirling Walkes, P.Eng., LEED AP<BR>SMS Engineering Ltd.<BR>770 Bradford
Street <BR>Winnipeg MB R3H 0N3 Canada<BR>phone: 204.775.0291<BR>fax:
204.772.2153<BR>Swalkes@smseng.com<BR><BR>>>> "Alec Stevens"
<astevens@dmiinc.com> 9/27/2006 2:01 PM >>><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Hi,<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Does anyone have any source that
documents the effect of (interior) window blinds on solar heat
gain?<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">We are working on a project with
motorized blinds that would respond to a photocell. The blinds are a
fabric mesh that allows 40% visible transmittance.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Has anyone used a reliable factor to
account for any reduction in solar heat gain from this type of window
blind?<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Thanks for any info that you may
have!<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Sincerely,</SPAN></FONT><o:p></o:p></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Alec Stevens, PE, LEED
AP</SPAN></FONT><o:p></o:p></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">DMI</SPAN></FONT><o:p></o:p></P>
<P class=MsoNormal><st1:address w:st="on"><st1:Street w:st="on"><FONT face=Arial
size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">450 Lexington
St.</SPAN></FONT></st1:Street><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">, <st1:City
w:st="on">Newton</st1:City>, <st1:State w:st="on">MA</st1:State> <st1:PostalCode
w:st="on">02466</st1:PostalCode></SPAN></FONT></st1:address><o:p></o:p></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">p: 617-527-1525 x105 f:
617-527-6606</SPAN></FONT><o:p></o:p></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">e:
astevens@dmiinc.com</SPAN></FONT><o:p></o:p></P>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></P></DIV><PRE>=====================================================You received this e-mail because you are subscribed
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