[Equest-users] G.3.1.2.8 Design Air Flow

[Vikram Sami]

To follow up on what Robb said, the fan delta T is the heat gain across the fan from the fan motor. 

 

You input your supply air temperature in this window:

 

 

Vikram Sami, LEED AP 
Direct Phone 404-253-1466 | Direct Fax 404-253-1366 

LORD, AECK & SARGENT ARCHITECTURE



 

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Robby Oylear
Sent: Thursday, September 17, 2009 5:53 PM
To: 'Chan, Walter'; Equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] G.3.1.2.8 Design Air Flow

 

The delta T G.3.1.2.8 is referring to a 20 degree delta between room cooling setpoint and supply air temperature.  For example:

 

Room Cooling Setpoint =        75 °F 

20 °F delta from G.3.1.2.8  = -20 °F 

Supply Air Temperature =      55 °F 

 

A 20 degree fan delta T would be a MONSTER of a fan..

 

Robby Oylear, LEED® AP

Mechanical Engineer

direct: 206.788.4571

cell: 206.354.2721

www.rushingco.com <http://www.rushingco.com/> 

 

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Chan, Walter
Sent: Thursday, September 17, 2009 2:50 PM
To: Equest-users at lists.onebuilding.org
Subject: [Equest-users] G.3.1.2.8 Design Air Flow

 

When I use delta T 20F for supply fan, the CFM stays the same and the cooling load is up 60% and heating load is slightly lower.  Any clue?

 

Is there a correct way to put in the Delta T 20F (after I set default and not using fan static pressure) and eQuest will calculate the correct CFM?

 

Thanks for the help.

 

Walter W. Chan, P.E., LEED AP 

 

CAS Group

1341 North Delaware Ave., Suite 500 | Philadelphia, PA 19125

T: 215.427.8711 |  F: 215.427.8710

 

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