[Equest-users] pnuematic -> DDC controls

[Paul Diglio]

Vincent:

I have developed many projects that include the conversion from pneumatic to 
electronic actuated valves and dampers.

I investigate the existing pneumatic control system to document valve and damper 
overlap and other calibration errors and develop an Excel spreadsheet to 
calculate the savings.  I often used Hobo dataloggers to track the existing 
temperature and reset errors.

An important consideration is if the existing system employs discharge air 
temperature reset and if this reset is based on OA or high-low space 
temperature.  The more complex pneumatic systems of yesteryear can do either as 
well as static pressure reset and even comparative OA-RA enthalpy.

A DDC system might not save much energy if replacing a well maintained and 
calibrated pneumatic control system.  In addition, if the DDC programmer does 
not calibrate the PID loops correctly, the DDC system might actually use more 
energy.  


Commissioning helps identify and correct this problem.

I don't think that I would try to calculate these savings using eQuest.  Excel 
is a better tool for this function.

Good luck,

Paul Diglio







________________________________
From: "Priolo, Vincent" <Vincent.Priolo at trane.com>
To: "equest-users at lists.onebuilding.org" <equest-users at lists.onebuilding.org>
Sent: Mon, November 22, 2010 1:03:53 PM
Subject: Re: [Equest-users] pnuematic -> DDC controls

 
Dear all,
New user here working on modeling VAV pneumatic to DDC conversion for energy 
savings.  Looking to model chilled water reset, hot water  reset, pressure 
reset, increased VAV response, and energy savings from compressor.  Looks like 
model must be done in Design Development Wizard.
 
Any advice?
 
Vince Priolo
Energy Solutions Engineer
Southern CaliforniaTrane
Cell - 805-550-4298
Direct - 626-435-1187
vincent.priolo at trane.com
 

________________________________
 
From:equest-users-bounces at lists.onebuilding.org  
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Praveen Jain
Sent: Sunday, November 21, 2010 11:35 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Relative Humidity in Unco
 

Dear All

Is it possible to know Relative Humidity in unconditioned zone of  eQUEST ?

-- 
With Thanks and Regards,
Praveen K. Jain
Roorkee
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