[Equest-users] Zone Reheat Delta-T

[Dennis Hunt]

Thanks Bill, RB for your input,

 

I looked at the BEPS and found Heating, cooling, Vent Fans, Pump&Aux all
went up for the 20F Zone Reheat Delta-T.

 

Hours coincident Cool-Heat Load and Fan electric During Heat & Cool jumped
significantly. Any thoughts on this? 

 

No unmet hours for either case

 

Thanks,

Dennis

 

-----Original Message-----
From: Bishop, Bill [mailto:wbishop at pathfinder-ea.com] 
Sent: Thursday, November 19, 2009 5:30 AM
To: R B; Dennis Hunt
Cc: equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] Zone Reheat Delta-T

 

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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