[Equest-users] pneumatic to ddc savings?

[Umesh Atre]

Thanks Paul!
 
 
 

________________________________

From: Paul Diglio [mailto:paul.diglio at sbcglobal.net] 
Sent: Monday, May 09, 2011 9:22 AM
To: Umesh Atre; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] pneumatic to ddc savings?


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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