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<DIV><FONT color=#0000ff face=Calibri><SPAN class=553483812-10052011>Thanks
Paul!</SPAN></FONT></DIV>
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<FONT size=2 face=Tahoma><B>From:</B> Paul Diglio
[mailto:paul.diglio@sbcglobal.net] <BR><B>Sent:</B> Monday, May 09, 2011 9:22
AM<BR><B>To:</B> Umesh Atre;
equest-users@lists.onebuilding.org<BR><B>Subject:</B> Re: [Equest-users]
pneumatic to ddc savings?<BR></FONT><BR></DIV>
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<DIV
style="FONT-FAMILY: times new roman,new york,times,serif; FONT-SIZE: 10pt">Umesh:<BR><BR>The
savings would depend on how well the existing pneumatic system has been
calibrated and what the baseline sequence of operation is compared to the
proposed sequence of operation. For example, there are pneumatic
transducers for static and relative humidity which can be used for static
pressure reset and enthalpy comparison. They are hard to calibrate and
require cleaning and re-calibration at least annually. A DDC system will provide
a more accurate static and enthalpy control. If you have the opportunity
to observe the system in operation, you might be able to make some set-point
adjustments and observe how the pneumatic controllers respond. This way
you can model the baseline with a different throttling range than the proposed
model.<BR><BR>You can factor in the savings realized by removing the air
compressor. It helps to monitor the air compressor for a bit to see how
often it runs. Some that I have seen run continuously due to air
leaks.<BR><BR>Paul Diglio<BR>
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<B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Umesh Atre
<umesh@innovativedesign.net><BR><B><SPAN
style="FONT-WEIGHT: bold">To:</SPAN></B>
equest-users@lists.onebuilding.org<BR><B><SPAN
style="FONT-WEIGHT: bold">Sent:</SPAN></B> Mon, May 9, 2011 8:46:34
AM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> [Equest-users]
pneumatic to ddc savings?<BR></FONT><BR>
<DIV><SPAN class=729253612-09052011><FONT face=Calibri>We are working on a
school project where the clients wish to change their pneumatic controls to DDC.
It is a 20 year-old building.</FONT></SPAN></DIV>
<DIV><SPAN class=729253612-09052011><FONT face=Calibri>Can anybody comment
on </FONT></SPAN><SPAN class=729253612-09052011><FONT face=Calibri>what the
range of savings is? The existing system is a 2-pipe for most spaces, currently
being modified to a new 4-pipe.</FONT></SPAN></DIV>
<DIV><SPAN class=729253612-09052011><FONT face=Calibri>Is it even possible to
quantify the savings, if any, using eQUEST? </FONT></SPAN></DIV>
<DIV><SPAN class=729253612-09052011></SPAN><SPAN class=729253612-09052011><FONT
face=Calibri>Thanks,</FONT></SPAN></DIV>
<DIV><SPAN class=729253612-09052011><FONT
face=Calibri>Umesh</FONT></SPAN></DIV></DIV></DIV></DIV></BODY></HTML>