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<p class=MsoNormal>Hello, All:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I am modeling a large hospital with Electric Heat Recovery
chillers to preheat the domestic hot water, but when I change the
chillers to open centrifugal without the heat recovery, the domestic hot water gas
consumption is identical to that with the recovery. I also am unsure of
how to set up the preheat loop for the DHW since it is does not appear that you
can model a primary/secondary arrangement when the loop type is DHW, but the
heat recovery cannot provide 140 deg. F DHW w/ condenser water temperatures of
85 to 95 deg F.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I also have a water-side economizer and although the cooling
energy consumption increases by about 1,500 MBtu when I use standard
centrifugal chillers, I am not convinced this is realistic.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I have attached the inp and pd2 files just in case and would
appreciate any insights and suggestions. Thanks in advance and have a
great day!<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Cam S. Fitzgerald, PE, LEED® AP<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Energy Opportunities, LLC</span><span style='font-size:12.0pt;
font-family:"Times New Roman","serif";color:navy'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>a 7group company</span><span style='font-size:12.0pt;font-family:
"Times New Roman","serif";color:navy'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>phone: (717) 292-2636 x11</span><span style='font-size:12.0pt;
font-family:"Times New Roman","serif";color:navy'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>fax: (717) 292-0585</span><span style='font-size:12.0pt;
font-family:"Times New Roman","serif";color:navy'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>e-mail: <a href="mailto:fitzgerald@sevengroup.com"
title="blocked::mailto:fitzgerald@sevengroup.com
mailto:fitzgerald@sevengroup.com"><span
style='color:blue'>fitzgerald@sevengroup.com</span></a></span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif";color:navy'><o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
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