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<DIV><FONT face=Arial size=2>Assuming your greenhosue is glazed then you could
model this (simplisticly) by adding an internal blind on a time / annual
schedule (Equest) that modifies the conductive layer below the glass. This
will give you an indication in the energy savings.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>In reality you will have a lot of stratification
and a CFD model that accounts for radiant heat transfer would provide the best
indication of the change in convective and radiant dynamics ...</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Regards,</FONT></DIV>
<DIV><FONT face=Arial size=2>Graham</FONT></DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=EKirchhoff@semprautilities.com
href="mailto:EKirchhoff@semprautilities.com">Kirchhoff, Eric</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=BLDG-SIM@GARD.COM
href="mailto:BLDG-SIM@GARD.COM">BLDG-SIM@GARD.COM</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, June 16, 2006 1:56 AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [BLDG-SIM] Greenhouse Curtain
Simulation</DIV>
<DIV><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">We are looking at trying to
simulate the performance of greenhouses with and without heat curtains.
The concept of the heat curtain is basically to trap the heat inside the
greenhouse so that it doesn’t radiate back out to the sky at night. The
energy savings will occur by a reduction in the use of heaters to keep the
temperature above a preset minimum desired setpoint.</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Someone suggested eQuest may be
able to do this, but I recall that there were some solar simulation tools
around back when I was in school. My instinct tells me these are
probably better tools for tracking the amount of energy the greenhouse would
store throughout a given day then eQuest. Is this an unfair
assumption? Has anyone performed an eQuest model similar to the one I am
describing in eQuest before?</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Thanks,</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><B><FONT face=Arial size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Arial">Eric Kirchhoff,
PE</SPAN></FONT></B></P>
<P class=MsoNormal><I><FONT face=Arial size=1><SPAN
style="FONT-SIZE: 8pt; FONT-STYLE: italic; FONT-FAMILY: Arial">EE Engineering
Supervisor</SPAN></FONT></I></P>
<P class=MsoNormal><I><FONT face=Arial size=1><SPAN
style="FONT-SIZE: 8pt; FONT-STYLE: italic; FONT-FAMILY: Arial">Customer
Programs</SPAN></FONT></I></P>
<P class=MsoNormal><B><FONT face=Arial color=navy size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Southern
California Gas Company</SPAN></FONT></B></P>
<P class=MsoNormal><EM><I><FONT face=Arial color=navy size=1><SPAN
style="FONT-SIZE: 6pt; COLOR: navy; FONT-FAMILY: Arial">a Sempra Energy
Utility</SPAN></FONT></I></EM></P>
<P class=MsoNormal><FONT face=Arial size=1><SPAN
style="FONT-SIZE: 8pt; FONT-FAMILY: Arial">555 West Fifth Street, GT28A4, Los
Angeles, CA 90013</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=1><SPAN
style="FONT-SIZE: 8pt; FONT-FAMILY: Arial">tel: (213)
244-4228 fax: (213) 244-8252</SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"></SPAN></FONT> </P></DIV><PRE>
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