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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Alper<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The main problem I see with your approach is that you are
essentially putting the heat pump in series with the district cooling plant. eQuest
currently will not do series chillers. However, if you have the option to split
the plant cooling load so that the heat pump and district plants are parallel,
you should be able to use the loop to loop model.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I have modeled a similar system using canal water instead of
return water from cooling coils. A loop to loop heat pump model assumes that
your heat source goes through one of two heat exchangers instead of going directly
into the chiller. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>In your case, the evaporator loop would be a local loop between
the heat exchanger and chiller, while your condenser loop </span><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#365F91'>would
be the </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#365F91'>LTHW </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#365F91'>loop serving</span><span style='font-size:11.0pt;font-family:
"Calibri","sans-serif";color:#1F497D'> the dedicated outdoor air units. You would
also need a ground loop heat exchanger of the “Lake/Well” type
connected to your heat source (CHR) loop.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Since you probably have no heat exchanger, just specify the evaporator
loop with similar conditions to the cooling coil return water.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I have attached a copy of the schematic to help clarify the
operation – Figure 34 most closely resembles your situation.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Regards,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#365F91'>MaryAnne
Mason</span></b><span lang=FR-CA style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#365F91'> <br>
</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#365F91'>Mechanical Engineer</span><span lang=FR-CA style='font-size:
10.0pt;font-family:"Arial","sans-serif";color:#365F91'> <br>
</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#365F91'>Process Infrastructure</span><span lang=FR-CA style='font-size:
10.0pt;font-family:"Arial","sans-serif";color:#365F91'> <br>
</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#365F91'> </span><span lang=FR-CA style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:#365F91'> <br>
</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#365F91'>Ausenco Sandwell</span><span lang=FR-CA style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:#365F91'> <br>
</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#365F91'>1016B Sutton Drive, Suite 100</span><span lang=FR-CA
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#365F91'> <br>
</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#365F91'>Burlington ON L7L 6B8</span><span lang=FR-CA style='font-size:
10.0pt;font-family:"Arial","sans-serif";color:#365F91'> <br>
</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#365F91'>Canada</span><span lang=FR-CA style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:#365F91'> <br>
</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#365F91'> </span><span lang=FR-CA style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:#365F91'> <br>
</span><b><span lang=FR style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#365F91'>T</span></b><span lang=FR style='font-size:10.0pt;font-family:
"Arial","sans-serif";color:#365F91'> +</span><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#365F91'>1 905
319 1698</span><span lang=FR-CA style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#365F91'> <br>
</span><b><span lang=FR style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#365F91'>F</span></b><span lang=FR style='font-size:10.0pt;font-family:
"Arial","sans-serif";color:#365F91'> +</span><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#365F91'>1
905 319 1801</span><span lang=FR-CA style='font-size:10.0pt;font-family:
"Arial","sans-serif";color:#365F91'> <br>
</span><b><span lang=PT-BR style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#365F91'>E</span></b><span lang=PT-BR style='font-size:10.0pt;font-family:
"Arial","sans-serif";color:#365F91'> </span><span lang=FR-CA
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#365F91'><a
href="mailto:maryanne.mason@ausencosandwell.com"><span lang=PT-BR
style='color:#365F91'>maryanne.mason@ausencosandwell.com</span></a> <br>
</span><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#365F91'>W</span></b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#365F91'> </span><span lang=FR-CA style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:#365F91'><a
href="http://www.ausenco.com/"><span lang=EN-US style='color:#365F91'>www.ausenco.com</span></a>
<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Regards<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Fred
Betz<br>
<b>Sent:</b> Thursday, October 21, 2010 3:06 PM<br>
<b>To:</b> Alper Erten; equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] loop to loop heat pump for preheat coils<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Alper,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>To my knowledge there is no way to do this within eQuest. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>What we do is output the hourly loads to a spreadsheet and apply
them to heat pumps or heat recovery chillers in TRNSYS. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>There is a lot of leg work required to setup a functioning
system including controllers, inputting performance maps, etc.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>This has worked very well for us in several HP and HRC
applications. If this is for a LEED project, it must be documented separately
as an exceptional calculation.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Fred<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<table class=MsoNormalTable border=0 cellpadding=0 width=474 style='width:355.5pt'>
<tr>
<td width=167 valign=top style='width:125.25pt;padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#660000;
text-transform:uppercase'>Fred Betz</span></b><b><span style='font-size:9.0pt;
font-family:"Calibri","sans-serif";color:#333333'> </span></b><span
style='font-size:9.0pt;font-family:"Calibri","sans-serif";color:#333333'>PhD.,
LEED AP <br>
</span><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#333333;text-transform:uppercase'>Sustainable Systems Analyst</span><span
style='font-size:9.0pt;font-family:"Calibri","sans-serif";color:#333333'><o:p></o:p></span></p>
</td>
<td width=10 valign=top style='width:7.5pt;padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Calibri","sans-serif";
color:#333333'> <o:p></o:p></span></p>
</td>
<td width=283 valign=top style='width:212.25pt;padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:9.0pt;font-family:"Calibri","sans-serif";color:#660000'>AEI</span></b><span
style='font-size:9.0pt;font-family:"Calibri","sans-serif";color:#333333'> | AFFILIATED
ENGINEERS, INC. <br>
5802 Research Park Blvd. | Madison, WI 53719<br>
<br>
</span><span style='font-size:9.0pt;font-family:"Calibri","sans-serif";
color:#660000'>P: 608.236.1175 | F: 608.238.2614</span><span
style='font-size:9.0pt;font-family:"Calibri","sans-serif";color:#333333'> <br>
</span><span style='font-size:9.0pt;font-family:"Calibri","sans-serif";
color:#660000'><a href="mailto:fbetz@aeieng.com"><span style='color:#660000;
text-decoration:none'>fbetz@aeieng.com</span></a> | <b><a
href="http://www.aeieng.com/"><span style='color:#660000;text-decoration:
none'>www.aeieng.com</span></a></b></span><span style='font-size:9.0pt;
font-family:"Calibri","sans-serif";color:#333333'> <o:p></o:p></span></p>
</td>
</tr>
</table>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Alper Erten [mailto:Alper.Erten@BuroHappold.com]
<br>
<b>Sent:</b> Thursday, October 21, 2010 2:02 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] loop to loop heat pump for preheat coils<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Hi all,</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I
am trying to simulate a heat pump which will recover heat from chilled water
return pipes to provide preheat for the dedicated outdoor air units in a
cooling dominated building. This is my first time trying to model heat
recovery with heat pumps, so I appreciate any help with it.</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>The
chilled water system is a district cooling plant which I modeled using
a chilled water meter. The heat pump would be in operation only when there
is a cooling demand and will be providing heat for LTHW loop which will
have preheat coils attached to it. The remaining heating is done via electric
resistance heating coils of the air side system which i modeled as a constant
volume single zone system.</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I
am not sure if this the correct way but I am trying to use a
loop-to-loop heat pump with default library performance curves; but couldn't
figure out which loop types are appropriate for it? This heat pump type
seems to require a condensing water loop which is not present in the
actual building design, do I still have to create one in the model? Also the
regular condensing water loop is not appropirate to be attached to a
loop-to-loop heat pump. Does this have to be a lake/well loop?</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I
am also trying to simulate a similar type of heating for the domestic hot
water. In the actual system, service water is preheated to an intermediate
temperature via heat pumps that recover heat from the chilled water loop
return and the secondary stage heating is done via electric
resistance water heaters. Is it possible to model this in Equest? </span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Thanks
in advance,</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Alper
Erten, PE, LEEDAP</span><o:p></o:p></p>
</div>
<p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p>
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