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<DIV><FONT face=Arial size=2>hi,</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>I've got a problem to model a water source heat
pump with heat rejection to a cooling tower</FONT></DIV>
<DIV><FONT face=Arial size=2>and a gas fired boiler as a backup for my
water loop.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Here is what I've already done :</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>first ( Jeff advice) I created a
heating/ventilating system ( AIR HVAC ) assigned to a fake
zone.</FONT></DIV>
<DIV><FONT face=Arial size=2>this is to model my make up air preheated, constant
volume, @ 55 F 100 % OA.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>I created the water loop HP ( WATER HVAC ) with my
boiler and my cooling tower.</FONT></DIV>
<DIV><FONT face=Arial size=2>in reality I have an evap. cooling tower BUT I
considered an OPEN CT in powerdoe</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Then my main HVAC system ( AIR HVAC) WATER LOOP HP
type.</FONT></DIV>
<DIV><FONT face=Arial size=2>in that system I assign my outside air coming from
my heating/ventilating system.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>In my building as I have a bunch of heat pumps
I entered my total</FONT></DIV>
<DIV><FONT face=Arial size=2>cooling and heating capacity in my system level and
I entered for each zone</FONT></DIV>
<DIV><FONT face=Arial size=2>their own cooling and heating capacity depending on
the number of heat pumps</FONT></DIV>
<DIV><FONT face=Arial size=2>( my total zone capacities equals my system
capacities)</FONT></DIV>
<DIV><FONT face=Arial size=2>I also entered my total flow ( corresponding to the
recirculating and OA).</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>In my water loop (that as a 20 F delta T), I
want the boiler to turns on only when my water loop</FONT></DIV>
<DIV><FONT face=Arial size=2>temperature goes below 75 F, and my cooling tower
to reject heat when my water loop</FONT></DIV>
<DIV><FONT face=Arial size=2>goes above 80 F.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>I entered the design GPM for my loop.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>then comes the problem :</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>In my ouput</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>I almost don't have any heat rejection, and
very small cooling.</FONT></DIV>
<DIV><FONT face=Arial size=2>( My EIR seems ok 0.015 for CT, 0.24 for
HP)</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>I use a lot of electrical heat ( my heat pump meter
is EM1) and I have rooms that remains</FONT></DIV>
<DIV><FONT face=Arial size=2>under 60 F with a setpoint @ 72 F.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>But I use an incredible high amount of gas in my
boiler..</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>plus I get these error message</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>the first message with the heat
and cooling capacity appears for all the zones !!</FONT></DIV>
<DIV><FONT face=Arial size=2> Powerdoe do not appreciate that my heat
pump heating capacity is higher than my cooling</FONT></DIV>
<DIV><FONT face=Arial size=2>capacity???</FONT> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV><FONT face=Arial><FONT size=2> </FONT>
<P class=MsoPlainText style="LINE-HEIGHT: normal; MARGIN-TOP: 0in"><FONT
size=2><SPAN
style="FONT-FAMILY: Courier; FONT-SIZE: 7pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'MS Mincho'"><SPAN
style="mso-spacerun: yes"> </SPAN>**WARNING**********************************************************************<?xml:namespace
prefix = o ns = "urn:schemas-microsoft-com:office:office"
/><o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText style="LINE-HEIGHT: normal; MARGIN-TOP: 0in"><FONT
size=2><SPAN
style="FONT-FAMILY: Courier; FONT-SIZE: 7pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'MS Mincho'"><SPAN
style="mso-spacerun: yes">
</SPAN>HEATING-CAPACITY of<SPAN style="mso-spacerun: yes">
</SPAN>-5040000. is inconsistent with a <o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText style="LINE-HEIGHT: normal; MARGIN-TOP: 0in"><FONT
size=2><SPAN
style="FONT-FAMILY: Courier; FONT-SIZE: 7pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'MS Mincho'"><SPAN
style="mso-spacerun: yes">
</SPAN>COOLING-CAPACITY of<SPAN style="mso-spacerun: yes">
</SPAN>4032000.in ZONE 2P-INT ZONE<SPAN
style="mso-spacerun: yes">
</SPAN><o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText style="LINE-HEIGHT: normal; MARGIN-TOP: 0in"><FONT
size=2><SPAN
style="FONT-FAMILY: Courier; FONT-SIZE: 7pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'MS Mincho'"> <o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText style="LINE-HEIGHT: normal; MARGIN-TOP: 0in"><FONT
size=2><SPAN
style="FONT-FAMILY: Courier; FONT-SIZE: 7pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'MS Mincho'"><SPAN
style="mso-spacerun: yes"> </SPAN>**WARNING**********************************************************************<o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText style="LINE-HEIGHT: normal; MARGIN-TOP: 0in"><FONT
size=2><SPAN
style="FONT-FAMILY: Courier; FONT-SIZE: 7pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'MS Mincho'"><SPAN
style="mso-spacerun: yes">
</SPAN>Pump: water source HP PUMP<SPAN
style="mso-spacerun: yes">
</SPAN>has a total user-specified flow<o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText style="LINE-HEIGHT: normal; MARGIN-TOP: 0in"><FONT
size=2><SPAN
style="FONT-FAMILY: Courier; FONT-SIZE: 7pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'MS Mincho'"><SPAN
style="mso-spacerun: yes">
</SPAN>of<SPAN style="mso-spacerun: yes">
</SPAN>485. gpm, but the loop flow is<SPAN
style="mso-spacerun: yes"> </SPAN>3903.
gpm.<o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText style="LINE-HEIGHT: normal; MARGIN-TOP: 0in"><FONT
size=2><SPAN
style="FONT-FAMILY: Courier; FONT-SIZE: 7pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'MS Mincho'"> <o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText style="LINE-HEIGHT: normal; MARGIN-TOP: 0in"><FONT
size=2><SPAN
style="FONT-FAMILY: Courier; FONT-SIZE: 7pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'MS Mincho'"><SPAN
style="mso-spacerun: yes"> </SPAN>**WARNING**********************************************************************<o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText style="LINE-HEIGHT: normal; MARGIN-TOP: 0in"><FONT
size=2><SPAN
style="FONT-FAMILY: Courier; FONT-SIZE: 7pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'MS Mincho'"><SPAN
style="mso-spacerun: yes">
</SPAN>Pump: water source HP PUMP<SPAN
style="mso-spacerun: yes">
</SPAN>has a user-specified head<o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText style="LINE-HEIGHT: normal; MARGIN-TOP: 0in"><FONT
size=2><SPAN
style="FONT-FAMILY: Courier; FONT-SIZE: 7pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'MS Mincho'"><SPAN
style="mso-spacerun: yes">
</SPAN>of<SPAN
style="mso-spacerun: yes"> </SPAN>57.
feet, but the loop head is<SPAN
style="mso-spacerun: yes"> </SPAN>67.
feet.<o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText style="LINE-HEIGHT: normal; MARGIN-TOP: 0in"><FONT
size=2><SPAN
style="FONT-FAMILY: Courier; FONT-SIZE: 7pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'MS Mincho'"> <o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText style="LINE-HEIGHT: normal; MARGIN-TOP: 0in"><FONT
size=2><SPAN
style="FONT-FAMILY: Courier; FONT-SIZE: 7pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'MS Mincho'"><SPAN
style="mso-spacerun: yes"> </SPAN>**CAUTION**********************************************************************<o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText style="LINE-HEIGHT: normal; MARGIN-TOP: 0in"><FONT
size=2><SPAN
style="FONT-FAMILY: Courier; FONT-SIZE: 7pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'MS Mincho'"><SPAN
style="mso-spacerun: yes">
</SPAN>Plant equipment: OPEN CT<SPAN
style="mso-spacerun: yes">
</SPAN>has a different<o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText style="LINE-HEIGHT: normal; MARGIN-TOP: 0in"><FONT
size=2><SPAN
style="FONT-FAMILY: Courier; FONT-SIZE: 7pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'MS Mincho'"><SPAN
style="mso-spacerun: yes">
</SPAN>pressure drop on loop: HP LOOP<SPAN
style="mso-spacerun: yes">
</SPAN>than the<o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText style="LINE-HEIGHT: normal; MARGIN-TOP: 0in"><FONT
size=2><SPAN
style="FONT-FAMILY: Courier; FONT-SIZE: 7pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'MS Mincho'"><SPAN
style="mso-spacerun: yes">
</SPAN>other equipment.<SPAN style="mso-spacerun: yes"> </SPAN>This is
unusual unless the loop<o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText style="LINE-HEIGHT: normal; MARGIN-TOP: 0in"><FONT
size=2><SPAN
style="FONT-FAMILY: Courier; FONT-SIZE: 7pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'MS Mincho'"><SPAN
style="mso-spacerun: yes">
</SPAN>uses flow meters or other dynamic flow
control<o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText style="LINE-HEIGHT: normal; MARGIN-TOP: 0in"><FONT
size=2><SPAN
style="FONT-FAMILY: Courier; FONT-SIZE: 7pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'MS Mincho'"><SPAN
style="mso-spacerun: yes">
</SPAN>devices to allocate the flow on an hourly basis
to<o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText style="LINE-HEIGHT: normal; MARGIN-TOP: 0in"><FONT
size=2><SPAN
style="FONT-FAMILY: Courier; FONT-SIZE: 7pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'MS Mincho'"><SPAN
style="mso-spacerun: yes">
</SPAN>the active equipment.<o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText style="LINE-HEIGHT: normal; MARGIN-TOP: 0in"><FONT
size=2><SPAN
style="FONT-FAMILY: Courier; FONT-SIZE: 7pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'MS Mincho'"> <o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText style="LINE-HEIGHT: normal; MARGIN-TOP: 0in"><FONT
size=2><SPAN
style="FONT-FAMILY: Courier; FONT-SIZE: 7pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'MS Mincho'"><SPAN
style="mso-spacerun: yes"> </SPAN>**WARNING**********************************************************************<o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText style="LINE-HEIGHT: normal; MARGIN-TOP: 0in"><FONT
size=2><SPAN
style="FONT-FAMILY: Courier; FONT-SIZE: 7pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'MS Mincho'"><SPAN
style="mso-spacerun: yes">
</SPAN>Loop: HP LOOP<SPAN
style="mso-spacerun: yes">
</SPAN><SPAN
style="mso-spacerun: yes"> </SPAN>heating
capacity is smaller<o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText style="LINE-HEIGHT: normal; MARGIN-TOP: 0in"><FONT
size=2><SPAN
style="FONT-FAMILY: Courier; FONT-SIZE: 7pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'MS Mincho'"><SPAN
style="mso-spacerun: yes">
</SPAN>than the secondary demand. Primary=
-2000000.<o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText style="LINE-HEIGHT: normal; MARGIN-TOP: 0in"><FONT
size=2><SPAN
style="FONT-FAMILY: Courier; FONT-SIZE: 7pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'MS Mincho'"><SPAN
style="mso-spacerun: yes">
</SPAN>Secondary= -7089648.<o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText style="LINE-HEIGHT: normal; MARGIN-TOP: 0in"><FONT
size=2><SPAN
style="FONT-FAMILY: Courier; FONT-SIZE: 7pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'MS Mincho'"> <o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText style="LINE-HEIGHT: normal; MARGIN-TOP: 0in"><FONT
size=2><SPAN
style="FONT-FAMILY: Courier; FONT-SIZE: 7pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'MS Mincho'"><SPAN
style="mso-spacerun: yes"> </SPAN>**WARNING**********************************************************************<o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText style="LINE-HEIGHT: normal; MARGIN-TOP: 0in"><FONT
size=2><SPAN
style="FONT-FAMILY: Courier; FONT-SIZE: 7pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'MS Mincho'"><SPAN
style="mso-spacerun: yes">
</SPAN>Loop: HP LOOP<SPAN
style="mso-spacerun: yes">
</SPAN><SPAN
style="mso-spacerun: yes"> </SPAN>cooling
capacity is smaller<o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText style="LINE-HEIGHT: normal; MARGIN-TOP: 0in"><FONT
size=2><SPAN
style="FONT-FAMILY: Courier; FONT-SIZE: 7pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'MS Mincho'"><SPAN
style="mso-spacerun: yes">
</SPAN>than the secondary demand. Primary=<SPAN style="mso-spacerun: yes">
</SPAN>4800000.<o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText style="LINE-HEIGHT: normal; MARGIN-TOP: 0in"><FONT
size=2><SPAN
style="FONT-FAMILY: Courier; FONT-SIZE: 7pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'MS Mincho'"><SPAN
style="mso-spacerun: yes">
</SPAN>Secondary= 39062304.<o:p></o:p></SPAN></FONT></P></FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>I must say that I am a little bit
lost...</FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Thanks,</FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Olivier Dosiere<BR>Project engineer<BR>DMI - 450
lexington street<BR>Newton, MA 02466<BR>617-527-1525 x 102</FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV><PRE>
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