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<title>Jaume Salom</title>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Paul<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thanks for your response. Yes, the
Condenser Loop Total Pressure Drop is 57’ which seems very high.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Typical design has been :<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<ol style='margin-top:0in' start=1 type=1>
<li class=MsoNormal style='color:navy;mso-list:l0 level1 lfo1'><font size=2
color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial'>Adding
up the Negative Factors (Vapor Pressure =1’ + Friction Losses = 20’
+ Chemical Treatment = 6’) = 27’<o:p></o:p></span></font></li>
</ol>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<ol style='margin-top:0in' start=2 type=1>
<li class=MsoNormal style='color:navy;mso-list:l0 level1 lfo1'><font size=2
color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial'>Adding
up the Positive Factors (Static Suction Head=1’ + Atmospheric
Pressure=34’ + Positive Pressure = 0’) = 35’<o:p></o:p></span></font></li>
</ol>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<ol style='margin-top:0in' start=3 type=1>
<li class=MsoNormal style='color:navy;mso-list:l0 level1 lfo1'><font size=2
color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial'>Calculating
the Net Positive Suction Head Available = Positive Factors –
Negative Factors = 35’ – 27’ = 8’<o:p></o:p></span></font></li>
</ol>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Good design for a typical plant should
limit the Frication Losses to 20’ to 25’.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>As long as the Net Positive Suction Head margin
of safety meets minimum NPSH margin ratios. ANSI/HI Standard 9.6.1-1998
recommends min NPSH margin ratios. For Cooling Towers the NPSHA/HPSHR = 1.3-1.5
with 2.0 being very high.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>That said, the Baseline for ASHRAE
90.1-2004 Appendix G specified Condenser Water Pumps to meet 19 W/gpm with
Single Speed Operation. For a typical Pump Efficiency of 77%, the Pump Head
needs to be 68 ft. If you look at your pumping energy, the Condenser Water
Pumps can easily consume more Energy than the Secondary Chilled Water Pump. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>For example on a ASHRAE Baseline New
Orleans 200,000 ft2 High School the Condenser Water Pumps consumed 50% of the
total pumping energy. Note that in such a warm climate the HHW pumping
requirements are negligible. Obviously in a colder climate the HHW Pumps will
significantly lower the 50%. Yet this exercise emphasizes the importance of
the Condenser Water Pumps which can contribute an annualized 0.14 kW/ton to the
Total Chilled Water Plant Efficiency. This is Significant.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Has anyone made an argument for Variable
Speed on the Condenser Pumps? How would the Flow Rate be controlled without
fighting the control of the Cooling Tower Fans?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Regards<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Ian<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
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color=black face="Times New Roman"><span style='font-size:12.0pt;color:windowtext'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 color=black face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;color:windowtext;font-weight:bold'>From:</span></font></b><font
size=2 color=black face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;
color:windowtext'> Paul Riemer [mailto:Paul.Riemer@dunhameng.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, September 16, 2008
8:08 AM<br>
<b><span style='font-weight:bold'>To:</span></b> 'Xavier García Casals';
Doebber, Ian<br>
<b><span style='font-weight:bold'>Cc:</span></b> <st1:PersonName w:st="on">equest-users@lists.onebuilding.org</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [Equest-users]
Changing Head Setpoint for Condenser Water Pump Head</span></font><font
color=black><span style='color:windowtext'><o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Look at the head on the tower, condenser
barrel of the chiller, and your loop, etc. These make up the head your
pump has to overcome.</span></font><o:p></o:p></p>
<blockquote style='margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<div class=MsoNormal align=center style='text-align:center'><font size=3
color=black face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabIndex=-1>
</span></font></div>
<p class=MsoNormal style='margin-bottom:12.0pt'><b><font size=2 color=black
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Xavier García Casals<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, September 16, 2008
8:58 AM<br>
<b><span style='font-weight:bold'>To:</span></b> Doebber, Ian<br>
<b><span style='font-weight:bold'>Cc:</span></b> <st1:PersonName w:st="on">equest-users@lists.onebuilding.org</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Equest-users]
Changing Head Setpoint for Condenser Water Pump Head</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'>Did you try the right click/restore to default, or the
right click/User default options to free this input?<br>
<br>
En/na Doebber, Ian ha escrit: <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial'><O:SMARTTAGTYPE namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="PlaceType"><O:SMARTTAGTYPE namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="PlaceName"><O:SMARTTAGTYPE namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place"></O:SMARTTAGTYPE></O:SMARTTAGTYPE></O:SMARTTAGTYPE>The
default Head Setpoint for the Condenser Water Pump on an <ST1:PLACE u1:st="on"><ST1:PLACENAME u1:st="on"><st1:place
w:st="on"><st1:PlaceName w:st="on">Open</ST1:PLACENAME></st1:PlaceName> <ST1:PLACENAME u1:st="on"><st1:PlaceName
w:st="on">Cooling</ST1:PLACENAME></st1:PlaceName> <ST1:PLACETYPE u1:st="on"><st1:PlaceType
w:st="on">Tower</ST1:PLACETYPE></ST1:PLACE></st1:PlaceType></st1:place> is 70
feet which is way too high! I want to set it to 40 feet but EQuest automatically
increases it to 70 ft. <O:P></O:P></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial'><O:P></O:P>How can I reduce the Head to 40 ft without
Equest resizing it?<O:P></O:P></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial'><br>
Regards<O:P></O:P></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial'>Ian<O:P></O:P></span></font><o:p></o:p></p>
<pre style='text-align:center' wrap=""><font size=2 color=black
face="Courier New"><span style='font-size:10.0pt'>
<hr size=4 width="90%" align=center>
</span></font></pre><pre><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'>_______________________________________________<o:p></o:p></span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'>Equest-users mailing list<o:p></o:p></span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'><a
href="http://console.mxlogic.com/redir/?1psKUPuX9JdZZWXPPxI06vaAWtm7A6V7EiwhU03xYGjB1SL09DyPvQCnrFYq5WMYwT8Z2k2f00jt-KCqejhOyqekQSm3tPvyPvQCnrFYq5O5mUm-wafBiteH3O3szQ9g8Y01dELIIe6QkQQnNPbypEVdzAjobZ8Qg6BIq5C_FcKTjUQdbFEw4yuM8Owhd40n_k3h0cvdqIEjd43JoCy0iH13Uk-9Ew0np_4Qg1pJloQg1vZgdPYfDwedECQPqrXXRTDDzoWhKl5LusOFD">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</a><o:p></o:p></span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'>To unsubscribe from this mailing list send a blank message to <a
href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</a><o:p></o:p></span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'> <o:p></o:p></span></font></pre>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'>-- <br>
<br>
<o:p></o:p></span></font></p>
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<u2:Pages>1</u2:Pages>
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</xml><![endif]--><pre><b><font size=3 color=black face=Arial><span lang=CA
style='font-size:12.0pt;font-family:Arial;font-weight:bold'><O:P> </O:P></span></font></b><o:p></o:p></pre><pre><b><font
size=3 color=black face=Arial><span lang=CA style='font-size:12.0pt;font-family:
Arial;font-weight:bold'>Xavier García Casals</span></font></b><o:p></o:p></pre><O:P></O:P><pre><font
size=2 color=black face=Arial><span lang=CA style='font-size:10.0pt;font-family:
Arial'><O:P> </O:P></span></font><o:p></o:p></pre><pre><b><font size=2
color=black face=Arial><span lang=CA style='font-size:10.0pt;font-family:Arial;
font-weight:bold'>Sistemas Solares, Eficiencia Energética e Ingeniería Bioclimática </span></font></b><o:p></o:p></pre><O:P></O:P><pre><b><font
size=2 color=black face=Arial><span lang=CA style='font-size:10.0pt;font-family:
Arial;font-weight:bold'>AIGUASOL INGENIERÍA<O:P></O:P></span></font></b><o:p></o:p></pre><pre><b><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
font-weight:bold'> </span></font></b><o:p></o:p></pre><O:P></O:P><pre><font
size=1 color="#009900" face=Arial><span lang=CA style='font-size:8.0pt;
font-family:Arial;color:#009900'>Sistemes Avançats d’Energia Solar Tèrmica SCCL<O:P></O:P></span></font><o:p></o:p></pre><pre><font
size=1 color="#009900" face=Arial><span lang=CA style='font-size:8.0pt;
font-family:Arial;color:#009900'>C/ Palermo, 17. Bajos dcha. 28043 Madrid<O:P></O:P></span></font><o:p></o:p></pre><pre><font
size=1 color="#009900" face=Arial><span lang=CA style='font-size:8.0pt;
font-family:Arial;color:#009900'>Tel: (+34) 91 142 27 88<O:P></O:P></span></font><o:p></o:p></pre><pre><font
size=1 color="#009900" face=Arial><span lang=CA style='font-size:8.0pt;
font-family:Arial;color:#009900'><O:P> </O:P></span></font><o:p></o:p></pre><pre><font
size=1 color="#009900" face=Arial><span lang=CA style='font-size:8.0pt;
font-family:Arial;color:#009900'>C/ Roger de Llúria, 29 3r 2a 08009 Barcelona<O:P></O:P></span></font><o:p></o:p></pre><pre><font
size=1 color="#009900" face=Arial><span lang=CA style='font-size:8.0pt;
font-family:Arial;color:#009900'>Tel: (+34) 93 342 47 55 Fax: (+34) 93 342 47 56<O:P></O:P></span></font><o:p></o:p></pre><pre><font
size=1 color="#009900" face=Arial><span lang=CA style='font-size:8.0pt;
font-family:Arial;color:#009900'><O:P> </O:P></span></font><o:p></o:p></pre><pre><font
size=1 color="#009900" face=Arial><span lang=CA style='font-size:8.0pt;
font-family:Arial;color:#009900'>Mobil: 660 22 94 45<O:P></O:P></span></font><o:p></o:p></pre><pre><font
size=1 color=blue face=Arial><span lang=CA style='font-size:8.0pt;font-family:
Arial;color:blue'><a href="mailto:xavier.garcia@aiguasol.coop">xavier.garcia@aiguasol.coop</a></span></font><o:p></o:p></pre><O:P></O:P><pre><font
size=1 color=blue face=Arial><span lang=CA style='font-size:8.0pt;font-family:
Arial;color:blue'><a
href="http://console.mxlogic.com/redir/?5BOXzdXICQTTTHLfe6M0mO8JXiF_mHlr3t-KCqejhOyqekQSm3tPvyPvQCnrFYq5O5mUm-wafBiteH3O3szQ9g8Y01dELIIe6QkQQnNPbypEVdzAjobZ8Qg6BIq5C_FcKTjUQdbFEw4yuM8Owhd40n_k3h0cvdqIEjd43JoCy0iH13Uk-9Ew0np_4Qg1pJloQg1vZgdPYfDwedFCQPqrXXRTDDzoWhKl5LusOFD">http://www.aiguasol.coop</a></span></font><o:p></o:p></pre><pre><b><font
size=3 color=black face=Arial><span lang=CA style='font-size:12.0pt;font-family:
Arial;font-weight:bold'><O:P> </O:P></span></font></b><o:p></o:p></pre></div>
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