<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;"><P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman" size=3>eQUEST Users,</FONT></DIV>
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<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman" size=3>I m trying to model a building served mainly by the following systems</FONT></DIV>
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<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman" size=3>1. <B style="mso-bidi-font-weight: normal">Four </B>ventilating air handlers condition all the entering outside air for the building to 72 degree F. </FONT></DIV>
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<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman" size=3>2. <B style="mso-bidi-font-weight: normal">Four</B> air handling units with return fans (they all have <B style="mso-bidi-font-weight: normal">cool-decks only, No Outside Air intakes</B>) that circulate and condition the return air of the whole building to 55 degree F.</FONT></DIV>
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<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT size=3><FONT face="Times New Roman"><B style="mso-bidi-font-weight: normal">Note: The 4 cool-deck-only air handling units don’t draw air straight off the ventilating air handling systems, instead they work in parallel. The conditioned air off each of </B>the<B style="mso-bidi-font-weight: normal"> </B>cool-deck-only air handlers<B style="mso-bidi-font-weight: normal"> only gets mixed with the conditioned air off </B>the ventilating air handler<B style="mso-bidi-font-weight: normal"> right before being discharged off each floor diffusers.<o:p></o:p></B></FONT></FONT></DIV>
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<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman" size=3>3. The rest of the building air conditioning is done through the parameter 4-pipe fan coils system.</FONT></DIV>
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<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman" size=3>The entire building’s cooling and heating demand relies on district chilled water and steam. </FONT></DIV>
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<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman" size=3>Could you shed some light on how to model this system correctly? </FONT></DIV>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman" size=3>My initial thought was to model it as an <B style="mso-bidi-font-weight: normal">Induction Unit (an air handler + the 4 pipe fan coils system) </B>with its outside air drawn from the dummy zone served by the Ventilating air handler. But in reality the cool-deck-only air handler doesn’t draw air straight off the ventilation air handlers. </FONT></DIV>
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<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman" size=3>your suggestions and inputs are highly appreciated.</FONT></DIV>
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<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman" size=3>Guo</FONT></DIV>
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