[Equest-users] eQuest Forum Courtesy

Bruce Easterbrook bruce5 at bellnet.ca
Mon Aug 2 12:19:50 PDT 2010


     Is an ASHRAE 62.1 analysis done and confirmed?
Bruce Easterbrook P.Eng.
Abode Engineering

On 30/07/2010 12:41 PM, Paul Diglio wrote:
> 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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