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<P><FONT FACE="Times New Roman">Hi All, </FONT>
<BR><FONT FACE="Times New Roman">I was wondering if any one could share their thoughts on the modeling approach in equest for the following HVAC system . </FONT></P>
<P><FONT FACE="Times New Roman">A typical unit, at the zone level there is a 4 pipe FC unit with chilled water from a Air Cooled Scroll Chiller and hot water coming for a heat exchanger. the heat exchanger it self is getting it hot water from a central geothermal plant . there is no boiler in this system. </FONT></P>
<P><FONT FACE="Times New Roman">here are couple of approaches I tried. </FONT>
<BR><U><FONT FACE="Times New Roman">Approach 1</FONT></U><FONT FACE="Times New Roman">: Demand side--model a Water loop HP with lake/well as source and connect the loop to hot water coils (without the boiler), and for cooling, to represent a scroll chiller, model a Screw chiller and connect that to a CHW loop which finally connects to the cooling coils. Supply side-- 4 pipe fan coil unit. </FONT></P>
<P><FONT FACE="Times New Roman">Although what I just described represents closely to my actual system, I could not do it with out boiler on the demand side, moreover I had other loop connection errors both on the demand side and supply side. </FONT></P>
<P><U><FONT FACE="Times New Roman">Approach 2</FONT></U><FONT FACE="Times New Roman">: Demand side--Model a HW boiler connect to a hot water loop and a Screw chiller connected to a chilled water loop , Supply side--- 4 Pipe FC unit. tweak the boiler parameters to fake a geothermal system in terms of loop temp and efficiency, which would be 100% . and put the boiler on a separate meter to deduct the boiler energy use(kw) in the end from the total annual energy use. </FONT></P>
<P><FONT FACE="Times New Roman">To a certain extent I am convinced that approach 2 would work. but I wanted to throw these ideas on the table to hear your comments and any new ways to model this above discussed HAVC system. </FONT></P>
<P><FONT FACE="Times New Roman">Thank you for your time and valuable suggestion. </FONT>
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<P><B><SPAN LANG="en-ca"><FONT SIZE=2 FACE="Arial">Aditya Potipireddi<BR>
</FONT></SPAN></B><SPAN LANG="en-ca"><FONT SIZE=2 FACE="Arial">Sustainable Building Analyst<BR>
Stantec<BR>
</FONT><FONT COLOR="#808080" SIZE=2 FACE="Arial">1932 First Avenue Suite 307<BR>
Seattle WA 98101<BR>
Ph: (206) 770-7770<BR>
Fx: (206) 770-5941<BR>
Aditya.Potipireddi@stantec.com<BR>
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