<br><font size=2 face="Arial">Sambhav,</font>
<br>
<br><font size=2 face="Arial">You must be new in this area. Let me
give it a try.</font>
<br>
<br><font size=2 face="Arial">1. This is about the cooling tower.
The design wet bulb temperature is the wet bulb (saturated) air temperature
at the deign condition. This wet bulb temperature adds 10F (approach)
is the assumed water temperature leaving the tower to enter the condenser.
This assumed temperature compares with 85F, whichever is lower is
the one that is going to be used for the condenser water supply temperature
by this design. Is this a little clearer? :-)</font>
<br>
<br><font size=2 face="Arial">2. This is about Primary-Seconary pump
system. Let me draw the diagram to make it easier to understand.</font>
<br><font size=2><tt> </tt></font>
<br><font size=2 face="sans-serif">
</font><img src=cid:_1_027EBD30027EB5C0004C49E88625766C>
<br><font size=2 face="Arial"> </font>
<br><font size=2 face="Arial">As shown in the above system diagram, using
the Secondary pump loop as the pump cure for your system calculation.</font>
<br>
<br>
<br><font size=2 face="Arial">Hope that helps a little. :-)</font>
<br>
<br>
<br><font size=2 face="Arial">Shawn Lee, PhD., PE</font>
<br>
<br>
<br>
<br>
<br>
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<td><font size=1 face="sans-serif"><b>sambhav tiwari <tiwari.sambhav@gmail.com></b></font>
<br><font size=1 face="sans-serif">Sent by: bldg-sim-bounces@lists.onebuilding.org</font>
<br><font size=1 face="sans-serif">11/12/2009 04:49 AM</font>
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<div align=right><font size=1 face="sans-serif">To</font></div>
<td><font size=1 face="sans-serif">bldg-sim@lists.onebuilding.org</font>
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<div align=right><font size=1 face="sans-serif">cc</font></div>
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<div align=right><font size=1 face="sans-serif">Subject</font></div>
<td><font size=1 face="sans-serif">[Bldg-sim] Quearies</font>
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<br><font size=2><tt>Dear Sir,<br>
I have some doubts
in ASHRAE90.1 statements as follows<br>
<br>
<br>
Page 178 G.3.1.3.11<br>
<br>
1 Heat rejection: "Condenser water design supply temperature shall
be<br>
85F or 10F approach at design wet bulb temperature,whichever is lower,<br>
with a design temperature rise of 10F". I could not understand meaning<br>
of this statement can anyone through light on this statement.<br>
<br>
2: G 3.1.3.10<br>
<br>
Chilled water pumps: "Chilled water pumps in system less than<br>
120000ft2 shall be modeled as a primary/secondary systems with<br>
secondary pump riding the pump cure" Can anyone explain the meaning
of<br>
this statement.<br>
<br>
Thanks<br>
Sambhav Tiwari<br>
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