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[bldg-sim] Pump location
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<div class=3DSection1>
<p class=3DMsoNormal><span class=3DEmailStyle20><font size=3D2 =
color=3Dnavy face=3DArial><span
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'>F=
rom design
experience, plate-frame heat exchangers can be quite expensive, =
particularly
when you have to rate the HX for high pressures.<span =
style=3D"mso-spacerun:
yes"> </span>There are two kinds of plate HXs, gasketed and
soldered.<span style=3D"mso-spacerun: yes"> </span>Getting a =
soldered type
sort of defeats one of the main advantages of a plate-frame type HX, =
its
expandability.<span style=3D"mso-spacerun: yes"> </span>The =
gasketed type for
high-pressure applications are less in supply and as a result cost a =
lot.<span
style=3D"mso-spacerun: yes"> </span>The highest-pressure rating =
I’ve seen
for a gasketed-type plate-frame HX is 300 =
psia.<o:p></o:p></span></font></span></p>
<p class=3DMsoNormal><span class=3DEmailStyle20><font size=3D2 =
color=3Dnavy face=3DArial><span
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'><=
![if =
!supportEmptyParas]> <![endif]><o:p></o:p></span></font></span></p>=
<p class=3DMsoNormal><span class=3DEmailStyle20><font size=3D2 =
color=3Dnavy face=3DArial><span
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'>M=
y
following comments apply to a gasketed-type plate-frame heat =
exchanger.<o:p></o:p></span></font></span></p>
<p class=3DMsoNormal><span class=3DEmailStyle20><font size=3D2 =
color=3Dnavy face=3DArial><span
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'><=
![if =
!supportEmptyParas]> <![endif]><o:p></o:p></span></font></span></p>=
<p class=3DMsoNormal><span class=3DEmailStyle20><font size=3D2 =
color=3Dnavy face=3DArial><span
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'>(=
1) How
high do you want to go?<span style=3D"mso-spacerun: yes"> =
</span>This is
really an indirect question related to the fill pressure of the system, =
the
location of the expansion tank, and the location of the HX in the =
system.<span
style=3D"mso-spacerun: yes"> </span>Note that when you fill the =
system, you
need an addition 2 to 5 psig of pressure to allow the water to spit out =
of the
top of the system, ensuring the entire system is filled and most (if =
not all)
of the air is out.<span style=3D"mso-spacerun: yes"> </span>(2) =
By putting
the HX at the pump discharge means you will feel the full impact of the =
dynamic
head of the pump and static head of the system at that location.<span
style=3D"mso-spacerun: yes"> </span>Not the best place in large =
systems
like campuses or district energy plants. (3) When including the =
comments
provided in (2) previously, one can then note that you can eliminate =
the
dynamic head from the equation. <span style=3D"mso-spacerun: =
yes"> </span>(4)
HX exposed to all of the static head plus the dynamic head depending =
upon the
placement of the pump in relation to the HX.<span =
style=3D"mso-spacerun:
yes"> </span>(5) Your static head is minimum, and dynamic head is =
again
only that contribution depending on the pump’s placement in =
relation to the HX.<span
style=3D"mso-spacerun: yes"> </span>Note this is probably your =
cheapest plate-frame
HX since the pressure is probably the lowest (assuming the expansion =
tank is
also located at the suction inlet of the pump).<span =
style=3D"mso-spacerun:
yes"> </span>(6) I don’t know exactly what you mean =
here.<o:p></o:p></span></font></span></p>
<p class=3DMsoNormal><span class=3DEmailStyle20><font size=3D2 =
color=3Dnavy face=3DArial><span
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'><=
![if =
!supportEmptyParas]> <![endif]><o:p></o:p></span></font></span></p>=
<p class=3DMsoNormal><span class=3DEmailStyle20><font size=3D2 =
color=3Dnavy face=3DArial><span
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'>A=
s for
what are the issues when the HX is replaced with other equipment such =
as
chillers and boilers:<span style=3D"mso-spacerun: yes"> =
</span>this will
depend upon the system you are dealing with.<span =
style=3D"mso-spacerun:
yes"> </span>Are there existing chillers and boilers being =
displaced by
this replacement?<span style=3D"mso-spacerun: yes"> =
</span>Why?<span
style=3D"mso-spacerun: yes"> </span>Is it of economic benefit to =
the
owner?<span style=3D"mso-spacerun: yes"> </span>Higher efficient =
device?<span
style=3D"mso-spacerun: yes"> </span>Perhaps you are referring to =
the
approach temperature.<span style=3D"mso-spacerun: yes"> =
</span>Note the
closer the approach temperature, the more expensive the heat =
exchanger.<span
style=3D"mso-spacerun: yes"> </span>However, the closer the =
approach
temperature, the more efficient the system.<span style=3D"mso-spacerun:
yes"> </span>For example, if you have a chilled-water system =
circulating
water at a 14 delta T, and you have a heat exchanger with a 2 degree =
approach,
then the load side of the heat exchanger operates at a 10 degree delta =
T.<span
style=3D"mso-spacerun: yes"> </span>If you have the same chiller =
system
circulating water at 14 degrees delta T and you have a 1-degree =
approach, then
your load side of the heat exchanger can operate at a 12-degree delta =
T.<span
style=3D"mso-spacerun: yes"> </span>As you can intuitively see, =
the one-degree
approach HX provides for a more efficient =
system.<o:p></o:p></span></font></span></p>
<p class=3DMsoNormal><span class=3DEmailStyle20><font size=3D2 =
color=3Dnavy face=3DArial><span
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'><=
![if !supportEmptyParas]> <![endif]></span></font></span><span
class=3DEmailStyle20><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial;color:navy;mso-color-=
alt:
windowtext'><o:p></o:p></span></font></span></p>
<p class=3DMsoNormal><span class=3DEmailStyle20><font size=3D2 =
color=3Dnavy face=3DArial><span
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'><=
![if =
!supportEmptyParas]> <![endif]><o:p></o:p></span></font></span></p>=
<p class=3DMsoNormal><span class=3DEmailStyle20><font size=3D2 =
color=3Dnavy face=3DArial><span
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'>S=
incerely,<o:p></o:p></span></font></span></p>
<p class=3DMsoNormal><span class=3DEmailStyle20><font size=3D2 =
color=3Dnavy face=3DArial><span
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'><=
![if =
!supportEmptyParas]> <![endif]><o:p></o:p></span></font></span></p>=
<p class=3DMsoAutoSig><!--[if supportFields]><span =
class=3DEmailStyle20><font=20
size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:
12.0pt;font-family:Arial'><span =
style=3D'mso-element:field-begin'></span><span=20
style=3D"mso-spacerun: yes"> </span>AUTOTEXTLIST \s "E-mail=20
Signature" <span =
style=3D'mso-element:field-separator'></span></span></font></span><![end=
if]--><font
color=3Dnavy><span style=3D'color:navy'>Eric Kirchhoff, =
PE</span></font><font
color=3Dnavy><span =
style=3D'color:navy;mso-color-alt:windowtext'><o:p></o:p></span></font><=
/p>
<p class=3DMsoAutoSig><font size=3D3 color=3Dnavy face=3D"Times New =
Roman"><span
style=3D'font-size:12.0pt;color:navy'><![if =
!supportEmptyParas]> <![endif]></span></font><font
color=3Dnavy><span =
style=3D'color:navy;mso-color-alt:windowtext'><o:p></o:p></span></font><=
/p>
<p class=3DMsoNormal><!--[if supportFields]><span =
class=3DEmailStyle20><font=20
size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:
12.0pt;font-family:Arial'><span =
style=3D'mso-element:field-end'></span></span></font></span><![endif]-->=
<span
class=3DEmailStyle20><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'><![if =
!supportEmptyParas]> <![endif]><o:p></o:p></span></font></span></p>=
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dblack
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma;color:black'>-----Original
Message-----<br>
<b><span style=3D'font-weight:bold'>From:</span></b> Varkie Thomas
[mailto:Varkie.Thomas@xxxxxxx]<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Wednesday, =
December 17, 2003
3:05 PM<br>
<b><span style=3D'font-weight:bold'>To:</span></b> =
bldg-sim@xxxxxxxx<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> [bldg-sim] Pump =
location</span></font></p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'><![if =
!supportEmptyParas]> <![endif]><o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dnavy face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;color:navy'>I am looking =
for
information (articles, research papers, case studies) on the effect of =
the
location of the pump relative to a plate and frame heat exchanger in a =
closed
piping system. Some of the issues are (1) the vertical height of =
the
piping system (1000’ to 2000’), how high can you go, (2) =
pumping thru HX, (3)
pumping away from HX, (4) pump and HX located at bottom of system, (5) =
pump and
HX at top of system, and (6) pump start up. What are the issues =
when the
HX is replaced with other equipment such as chillers and =
boilers?</span></font><font
color=3Dblack><span =
style=3D'color:black;mso-color-alt:windowtext'><o:p></o:p></span></font>=
</p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dnavy face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;color:navy'> </span></f=
ont><font
color=3Dblack><span =
style=3D'color:black;mso-color-alt:windowtext'><o:p></o:p></span></font>=
</p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dnavy face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;color:navy'>Varkie =
Thomas</span></font><font
color=3Dblack><span =
style=3D'color:black;mso-color-alt:windowtext'><o:p></o:p></span></font>=
</p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dnavy face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;color:navy'>Skidmore, =
Owings &
Merrill</span></font><font color=3Dblack><span =
style=3D'color:black;mso-color-alt:
windowtext'><o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dnavy face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;color:navy'>312-360-4467</sp=
an></font><font
color=3Dblack><span =
style=3D'color:black;mso-color-alt:windowtext'><o:p></o:p></span></font>=
</p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
color=3Dblack
face=3D"Times New Roman"><span =
style=3D'font-size:12.0pt;color:black'> </span></font><font
color=3Dblack><span =
style=3D'color:black;mso-color-alt:windowtext'><o:p></o:p></span></font>=
</p>
<pre style=3D'margin-left:.5in'><font size=3D2 color=3Dblack =
face=3D"Courier New"><span
style=3D'font-size:10.0pt;color:black'><![if =
!supportEmptyParas]> <![endif]></span></font><font
color=3Dblack><span =
style=3D'color:black;mso-color-alt:windowtext'><o:p></o:p></span></font>=
</pre><pre
style=3D'margin-left:.5in'><font size=3D2 color=3Dblack face=3D"Courier =
New"><span
style=3D'font-size:10.0pt;color:black'><![if =
!supportEmptyParas]> <![endif]></span></font><font
color=3Dblack><span =
style=3D'color:black;mso-color-alt:windowtext'><o:p></o:p></span></font>=
</pre><pre
style=3D'margin-left:.5in'><font size=3D2 color=3Dblack face=3D"Courier =
New"><span
style=3D'font-size:10.0pt;color:black'>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3DYou received this =
e-mail because you are subscribed </span></font><font
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</pre><pre
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</pre><pre
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