[Equest-users] eQuest Forum Courtesy

[Paul Diglio]

Vidya:

You are welcome.  Actually the response to your query was one reason I wrote the Administrator.

My background is as a licensed HVAC contractor, mechanical designer and energy auditor/CEM/CEA/CBCP.  I have audited many buildings and worked on multiple designs where a variable air volume air handler was existing or was specified without any VAV terminal devices.

Usually the static pressure of the fan is reset based on a space temperature - discharge air temperature algorithm.  In a typical investment grade audit, I will specify that a VFD be installed on the fan and that the CFM be reduced as the outside air temperature drops, since we do not need as much air for heating as for cooling.  Remember, reducing the CFM of a centrifugal fan just 20% will reduce the kW input almost by half.

It is not the best way to control a VFD,
 but it works, saves energy and has been approved on many occasions during the incentive review by the utility company PE.  The sizable incentives that I have received for this strategy is indicative that it works. I have also returned to the site during the monitoring and verification phase and the energy savings have been confirmed.

Good luck with eQuest,

Paul Diglio



--- On Fri, 7/30/10, vidya gowda <vidyacg at vt.edu> wrote:

From: vidya gowda <vidyacg at vt.edu>
Subject: Re: [Equest-users] eQuest Forum Courtesy
To: "Paul Diglio" <paul.diglio at sbcglobal.net>
Date: Friday, July 30, 2010, 12:17 PM

thanks Paul, 

That was kind of you to ask on behalf of the mail equest and energy modeling users, without this list sometimes it becomes difficult to work on when you are on your own.. and when people comment that new users should first learn, this is one of our primary source of information, if we are not allowed how will we reach to the level where the
 established already are???



Earlier today, I had personally appologized to all the people who has replyed to my query saying that next time I would not put up a question realted to design. But this surely is reconfirming. 

thanks it helps get some motivation instead of feeling low with such comments. 



Kind regards, 
Vidya

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