[Equest-users] pneumatic to ddc savings?

[Paul Diglio]

Umesh:

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.

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.

Paul Diglio





________________________________
From: Umesh Atre <umesh at innovativedesign.net>
To: equest-users at lists.onebuilding.org
Sent: Mon, May 9, 2011 8:46:34 AM
Subject: [Equest-users] pneumatic to ddc savings?


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.
Can anybody comment  on what the  range of savings is? The existing system is a 
2-pipe for most spaces, currently  being modified to a new 4-pipe.
Is it even possible to  quantify the savings, if any, using eQUEST? 
Thanks,
Umesh
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