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Unfortunately, the envelope loads are calculated in the Loads
routine, in advance of the system response calculation by the System
(and Plant) routine. So, if the zone temperature is considerably
different than the space temperature (used for the loads
calculation), there will be a difference in the envelope driven
heating/cooling requirement. <br>
<br>
It is an iterative process (in each time step) to calculate the
actual space temperature. DOE-2 (neither 2.1 nor 2.2) do not do
this iterative process. If it is important -- that is what
EnergyPlus does.<br>
<br>
On 4/18/2011 2:48 PM, Harrity, Sean wrote:
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<p class="MsoNormal"><font size="2" face="Arial"><span
style="font-size: 10pt; font-family: Arial;">Hi,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span
style="font-size: 10pt; font-family: Arial;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span
style="font-size: 10pt; font-family: Arial;">Does
anyone know if and how eQUEST accounts for the
temperature dependence of U values? For
instance, some manufacturers specify a
summer design condition U value that is
different from a winter design
condition U value. Ideally I would like to
have eQUEST calculate the hourly U
value based on the hourly temperature to get
accurate skin loads throughout the
whole year. If anyone knows how this can be
done, please let me know.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span
style="font-size: 10pt; font-family: Arial;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span
style="font-size: 10pt; font-family: Arial;">Thanks,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span
style="font-size: 10pt; font-family: Arial;">Sean<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span
style="font-size: 10pt; font-family: Arial;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="3" face="Times New
Roman"><span style="font-size: 12pt;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><b><font size="1"
color="#0069aa" face="Arial"><span
style="font-size: 8pt; font-family: Arial;
color: rgb(0, 105, 170); font-weight: bold;">Sean
Harrity</span></font></b><font size="1"
color="#939598" face="Arial"><span
style="font-size: 8pt; font-family: Arial;
color: rgb(147, 149, 152);"> |</span></font><font
size="1" color="black" face="Arial"><span
style="font-size: 8pt; font-family: Arial;
color: black;"> </span></font><b><font
size="1" color="#939598" face="Arial"><span
style="font-size: 8pt; font-family: Arial;
color: rgb(147, 149, 152); font-weight:
bold;">Mechanical
Engineer<br>
</span></font></b><font size="1"
color="#939598" face="Arial"><span
style="font-size: 8pt; font-family: Arial;
color: rgb(147, 149, 152);">Phone: 212-615-3923
| Fax:
212-615-3700<br>
</span></font><font size="1" face="Arial"><span
style="font-size: 8pt; font-family: Arial;"><a class="moz-txt-link-abbreviated" href="mailto:sharrity@cosentini.com">sharrity@cosentini.com</a><br>
<br>
<b><font color="#939598"><span style="color:
rgb(147, 149, 152); font-weight: bold;">Cosentini
Associates
- A Tetra Tech Company<br>
</span></font></b><font color="#939598"><span
style="color: rgb(147, 149, 152);">Two <st1:placename
w:st="on">Pennsylvania</st1:placename> <st1:placetype
w:st="on">Plaza</st1:placetype>
- Third Floor - <st1:place w:st="on"><st1:city
w:st="on">New York</st1:city>, <st1:state
w:st="on">NY</st1:state> <st1:postalcode
w:st="on">10121</st1:postalcode></st1:place><br>
<a moz-do-not-send="true"
href="http://www.cosentini.com/">www.cosentini.com</a><br>
<br>
</span></font></span></font><o:p></o:p></p>
<p class="MsoNormal"><font size="3" face="Times New
Roman"><span style="font-size: 12pt;"><o:p> </o:p></span></font></p>
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