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<DIV dir=ltr align=left><SPAN class=848513516-31082007><FONT face="Courier New"
color=#0000ff size=2>Lan,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=848513516-31082007></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=848513516-31082007><FONT face="Courier New"
color=#0000ff size=2>As JL suggests, if yours is a hot and humid climate, you
may have better results using a heat wheel (enthalpy wheel) with
total enthalpy recovery. <SPAN class=848513516-31082007><FONT
face="Courier New" color=#0000ff size=2>Sensible-only as shown in my example is
economical in relatively low humidity, cool-summer climates that don't provide
much summertime heat recovery opportunity. </FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=848513516-31082007></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=848513516-31082007><FONT face="Courier New"
color=#0000ff size=2><SPAN class=848513516-31082007><FONT face="Courier New"
color=#0000ff size=2>So for your project, calculate <SPAN
class=848513516-31082007><FONT face="Courier New" color=#0000ff
size=2>the theoretical summertime opportunity value before attempting
troubleshooting with
eQuest:</FONT></SPAN></FONT></SPAN></FONT></SPAN></FONT></SPAN></DIV><SPAN
class=848513516-31082007>
<DIV dir=ltr align=left>
<UL dir=ltr>
<LI>
<DIV align=left><SPAN class=848513516-31082007><FONT face="Courier New"
color=#0000ff size=2>What are the estimated flow rates of the outdoor and
exhaust airstreams?</FONT></SPAN></DIV>
<LI>
<DIV align=left><SPAN class=848513516-31082007><FONT face="Courier New"
color=#0000ff size=2>What are the outdoor air expected summer average
conditions in terms of temperature and humidity (i.e. enthalpy)?
</FONT></SPAN></DIV>
<LI>
<DIV align=left><SPAN class=848513516-31082007><FONT face="Courier New"
color=#0000ff size=2>What is the expected temperature and humidity of the
exhaust airstream? </FONT></SPAN></DIV>
<UL>
<LI>
<DIV align=left><SPAN class=848513516-31082007><FONT face="Courier New"
color=#0000ff size=2>The exhaust airstream in general occupancy applications
can be <STRONG>estimated</STRONG> at about 85¡ãF and 35% relative humidity,
corresponding to the absolute moisture content at 55¡ãF saturation
temperature from a typical cooling coil, plus 2% for people and
processes. </FONT></SPAN></DIV></LI></UL>
<LI>
<DIV align=left><SPAN class=848513516-31082007><FONT face="Courier New"
color=#0000ff size=2>Now the opportunity value of summertime heat
recovery may be estimated:</FONT></SPAN></DIV>
<UL>
<LI>
<DIV align=left><SPAN class=848513516-31082007><FONT face="Courier New"
color=#0000ff size=2>Calculate the enthalpy difference between the
outdoor summer average and the estimated exhaust airstream,
and multiply by the ratio of the exhaust/OSA flow rates.
</FONT></SPAN></DIV></LI></UL></LI></UL></DIV>
<DIV dir=ltr align=left><SPAN class=848513516-31082007><FONT face="Courier New"
color=#0000ff size=2><SPAN class=848513516-31082007><FONT face="Courier New"
color=#0000ff size=2><SPAN class=848513516-31082007><FONT face="Courier New"
color=#0000ff size=2>Without significant differential enthalpy between outdoor
ambient average and the exhaust airstream, there simply may not be much
summertime heat recovery
opportunity.</FONT></SPAN></FONT></SPAN></FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=848513516-31082007><FONT face="Courier New"
color=#0000ff size=2><SPAN class=848513516-31082007><FONT face="Courier New"
color=#0000ff size=2><SPAN
class=848513516-31082007></SPAN></FONT></SPAN></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=848513516-31082007><FONT face="Courier New"
color=#0000ff size=2><SPAN class=848513516-31082007><FONT face="Courier New"
color=#0000ff size=2>Hope that helps...</FONT></SPAN></FONT></SPAN></DIV>
<DIV dir=ltr align=left><FONT face="Courier New" color=#0000ff
size=2></FONT></SPAN><FONT face="Courier New" color=#0000ff
size=2></FONT> </DIV>
<DIV align=left>
<DIV align=left><FONT face=Arial size=2></FONT> </DIV><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">
<DIV><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><SPAN
class=212011020-11052004><FONT color=#000000>Brandon Nichols,
PE, LEED<SUP><SPAN style="FONT-SIZE: 8pt">®</SPAN></SUP>
AP</FONT></SPAN></SPAN></DIV>
<DIV><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><SPAN
class=212011020-11052004><FONT
color=#000000>Mechanical</FONT></SPAN></SPAN></DIV>
<DIV><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><FONT
color=#000080><STRONG>HARGIS ENGINEERS</STRONG></FONT></DIV>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><FONT
color=#515151>600 Stewart Street</FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><FONT
color=#515151>Suite 1000</FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><FONT
color=#515151>Seattle, WA 98101<o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><FONT
color=#515151>www.hargis.biz<o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><FONT
color=#515151> <o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><B><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">d
|</SPAN></B><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">
206.436.04<SPAN class=212011020-11052004>0</SPAN>0<SPAN
style="mso-spacerun: yes"> </SPAN><B>c | </B>206.<SPAN
class=212011020-11052004>228.8707</SPAN></SPAN></P>
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style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><SPAN
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206.448.3376<SPAN style="mso-spacerun: yes"> </SPAN><B>f <SPAN
style="mso-spacerun: yes"> </SPAN>|</B>
206.448.4450</SPAN></FONT></P></SPAN></SPAN>
<DIV><FONT face="Courier New" color=#0000ff size=2></FONT> </DIV></DIV>
<DIV> </DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> Lan Hu [mailto:hulan199@yahoo.com]
<BR><B>Sent:</B> Friday, August 31, 2007 8:54 AM<BR><B>To:</B> Brandon
Nichols<BR><B>Subject:</B> Re: [BLDG-SIM] ERV (Energy recovery ventilation)
simulation in eQuest<BR></FONT><BR></DIV>
<DIV></DIV>Thank you very much, Brandon. After I tried used DT/DH control with
rang from 5-30, I still didn't get any saving on the cooling side - the ERV sim
report still show heating energy used during summer. Any more
suggestion?<BR><BR><B><I>Brandon Nichols <BrandonN@Hargis.biz></I></B>
wrote:
<BLOCKQUOTE class=replbq
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">
<META content="MSHTML 6.00.5730.11" name=GENERATOR>
<DIV dir=ltr align=left><SPAN style="FONT-SIZE: 85%"><SPAN
style="COLOR: rgb(153,153,153); FONT-STYLE: italic; FONT-FAMILY: courier new"><SPAN
class=489091821-30082007><FONT face=Arial color=#000000 size=2>Lan, see this
post...</FONT></SPAN></SPAN></SPAN></DIV>
<DIV dir=ltr align=left><SPAN style="FONT-SIZE: 85%"><SPAN
style="COLOR: rgb(153,153,153); FONT-STYLE: italic; FONT-FAMILY: courier new"><SPAN
class=489091821-30082007><FONT face=Arial color=#000000
size=2></FONT></SPAN></SPAN></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN style="FONT-SIZE: 85%"><SPAN
style="COLOR: rgb(153,153,153); FONT-STYLE: italic; FONT-FAMILY: courier new"><SPAN
class=489091821-30082007><A
href="http://elcca-exchange.blogspot.com/2007/04/equest-parametric-sensible-heat.html">http://elcca-exchange.blogspot.com/2007/04/equest-parametric-sensible-heat.html</A></SPAN></SPAN></SPAN></DIV>
<DIV dir=ltr align=left><SPAN style="FONT-SIZE: 85%"><SPAN
style="COLOR: rgb(153,153,153); FONT-STYLE: italic; FONT-FAMILY: courier new"><SPAN
class=489091821-30082007><FONT face=Arial color=#000000
size=2></FONT></SPAN></SPAN></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN style="FONT-SIZE: 85%"><SPAN
style="COLOR: rgb(153,153,153); FONT-STYLE: italic; FONT-FAMILY: courier new"><SPAN
class=489091821-30082007><FONT face=Arial color=#000000 size=2>Here's an
excerpt:</FONT></SPAN></SPAN></SPAN></DIV>
<DIV dir=ltr align=left><SPAN style="FONT-SIZE: 85%"><SPAN
style="COLOR: rgb(153,153,153); FONT-STYLE: italic; FONT-FAMILY: courier new"><SPAN
class=489091821-30082007></SPAN></SPAN></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN style="FONT-SIZE: 85%"><SPAN
style="COLOR: rgb(153,153,153); FONT-STYLE: italic; FONT-FAMILY: courier new">$
FLOAT gives maximum heat recovery but recovers even unwanted heat, so<BR>$ use
th<SPAN class=489091821-30082007>is</SPAN> setting for temperature
control</SPAN><BR><SPAN style="FONT-FAMILY: courier new">ERV-TEMP-CTRL =
MIXED-AIR-RESET</SPAN></SPAN></DIV>
<DIV><FONT face="Courier New" color=#0000ff size=2></FONT> </DIV>
<DIV align=left>
<DIV align=left><FONT face=Arial size=2><SPAN class=489091821-30082007>Also,
the ÄT between exhaust and OSA is typically not great, even if its 110°F outside
and your exhaust/relief is 85°F, the ÄT is only 25°F -- compare that to even
a mild winter condition of 35°F, where the ÄT is double at equivalent
exhaust temperature (i.e 85 - 35 = 50°F).</SPAN></FONT></DIV>
<DIV align=left><FONT face=Arial size=2><SPAN
class=489091821-30082007></SPAN></FONT> </DIV>
<DIV align=left><FONT face=Arial size=2><SPAN
class=489091821-30082007>Regards</SPAN></FONT></DIV>
<DIV align=left><FONT face=Arial size=2><SPAN
class=489091821-30082007></SPAN></FONT> </DIV><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">
<DIV><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><SPAN
class=212011020-11052004><FONT color=#000000>Brandon Nichols,
PE, LEED<SUP><SPAN style="FONT-SIZE: 8pt">®</SPAN></SUP>
AP</FONT></SPAN></SPAN></DIV>
<DIV><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><SPAN
class=212011020-11052004><FONT
color=#000000>Mechanical</FONT></SPAN></SPAN></DIV>
<DIV><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><FONT
color=#000080><STRONG>HARGIS ENGINEERS</STRONG></FONT></DIV>
<DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><FONT
color=#515151>600 Stewart Street</FONT></SPAN></DIV>
<DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><FONT
color=#515151>Suite 1000</FONT></SPAN></DIV>
<DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><FONT
color=#515151>Seattle, WA 98101<o:p></o:p></FONT></SPAN></DIV>
<DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><FONT
color=#515151>www.hargis.biz<o:p></o:p></FONT></SPAN></DIV>
<DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><FONT
color=#515151> <o:p></o:p></FONT></SPAN></DIV>
<DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><B><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">d
|</SPAN></B><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">
206.436.04<SPAN class=212011020-11052004>0</SPAN>0<SPAN
style="mso-spacerun: yes"> </SPAN><B>c | </B>206.<SPAN
class=212011020-11052004>228.8707</SPAN></SPAN></DIV>
<DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><SPAN
class=212011020-11052004></SPAN></SPAN><FONT color=#515151><B><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA">o
|</SPAN></B><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA">
206.448.3376<SPAN style="mso-spacerun: yes"> </SPAN><B>f <SPAN
style="mso-spacerun: yes"> </SPAN>|</B>
206.448.4450</SPAN></FONT></DIV></SPAN></SPAN>
<DIV> </DIV></DIV>
<DIV> </DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> BLDG-SIM@gard.com
[mailto:BLDG-SIM@gard.com] <B>On Behalf Of </B>Lan Hu<BR><B>Sent:</B>
Thursday, August 30, 2007 1:54 PM<BR><B>To:</B>
BLDG-SIM@gard.com<BR><B>Subject:</B> [BLDG-SIM] ERV (Energy recovery
ventilation) simulation in eQuest<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV>Hi, all,</DIV>
<DIV> </DIV>
<DIV>I have problem simulating ERV in eQUSET. In the program I specified ERV
effectiveness around 72%, the results show 64% energy saving in heating but
just 5% saving in cooling, even when I cut off all the fan tempetrature
increase. Anyone has experience or suggestion?. Thank you very much.</DIV>
<DIV> </DIV>
<DIV>Lan</DIV>
<DIV>
<HR SIZE=1>
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