[Equest-users] Zone Reheat Delta-T

[Bishop, Bill]

Dennis,

The first thing you should look at anytime you are analyzing the
difference in energy use is your BEPS/BEPU reports. Is the difference in
heating, cooling, fan energy, pumping? As R B said, is there a
difference in unmet hours?

For VAV-specific design/energy issues, check out this free resource:

http://www.energydesignresources.com/Technology/HVACDesign/tabid/97/arti
cleType/ArticleView/articleId/331/Default.aspx

Regards,
Bill

William Bishop, EIT, LEED(r) AP | Pathfinder Engineers LLP
Mechanical Engineer
 
134 South Fitzhugh Street
Rochester, NY 14608
T: (585) 325-6004 Ext. 114
F: (585) 325-6005
bbishop at pathfinderengineers.com
 
www.pathfinderengineers.com
P Please strive to live sustainably.
-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of R B
Sent: Thursday, November 19, 2009 7:59 AM
To: Dennis Hunt
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Zone Reheat Delta-T

one think I can think of is - there might be more unmet heating hours
in the first case.

On 11/18/09, Dennis Hunt <dhunt at summitbe.com> wrote:
> eQUEST users,
>
>
>
> I am modeling a simple 9 story office building in v3.63. The system
type is
> VAV w/ HW Reheat. One Fan system per floor.
>
> With a 20F Zone Reheat Delta-T the Annual Energy Consumption is 38%
higher
> than it is with a 30F Zone Reheat Delta-T.
>
>
>
> This is not intuitive to me why the energy use greatly increases with
a
> lower zone reheat Delta-T.
>
>
>
> Thanks for any help,
>
>
>
> Dennis Hunt
>
> Summit Building Engineering
>
> dhunt at summitbe.com
>
>
>
>
>
>
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