[Equest-users] HVAC Loads Based on eQuest

[Matutinovic, Luka]

So does this mean that the eQuest default is to use internal gains to size heating equipment thereby under-sizing it compared to what mechanical designers would typically do, but that you can over-ride this by setting the internal loads HDD to zero?
 
To James and others who have compared eQuest loads to Trace (HAP, etc):
To get good correlation, are you creating design day schedules to use in eQuest, much like the mechanical loads software uses design day conditions for sizing?  I've always thought that the difference between eQuest loads and sizing software loads is due to the fact that eQuest uses typical hourly weather data which may not include the design day extremes, unless you create custom design day schedules?
 
Thanks,
 

Luka Matutinovic, B.A.Sc., LEED® AP

Green Building Consultant


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From: Howe, Timothy [mailto:Timothy.Howe at stantec.com] 
Sent: Thursday, November 05, 2009 11:32 AM
To: Hernandez, Arturo; James Hess; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] HVAC Loads Based on eQuest


Not sure if that is accurate.  If you schedule your internal loads HDD to be zero in each hour, then the winter peak loads should not include these values/gains.
 
 
Timothy Howe, MS, LEED® AP
Mechanical Engineer
Stantec
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From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Hernandez, Arturo
Sent: Thursday, November 05, 2009 11:27 AM
To: James Hess; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] HVAC Loads Based on eQuest



I guess the problem is when calculating loads you may want to be a little more conservative with you internal loads and when you are doing energy modeling you want to be more exact with your assumptions. In addition, my understanding is that internal loads contribute to space heating in eQuest load calcs. Which something that many engineers would not feel comfortable with. 

 

ARTURO HERNANDEZ, Mechanical Engineering



 

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of James Hess
Sent: Thursday, November 05, 2009 10:03 AM
To: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] HVAC Loads Based on eQuest

 

That's the way are offices typically do it as well (i.e. Trace for loads, eQuest for energy).

 

I have found that when both programs use the same inputs for envelope, lighting, misc equipment, etc., the two programs produce results that are pretty close.

 

 

Regards,

 

James A.  Hess, PE, CEM

Energy Engineer

TME, Inc.

Little Rock, AR

ph   501-666-6776

cell  501-351-4667

jhess at tmecorp.com <mailto:email at tmecorp.com> 

 

 

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Hernandez, Arturo
Sent: Thursday, November 05, 2009 9:13 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] HVAC Loads Based on eQuest

 

Just wondering... Has anyone based their HVAC design on eQuest results? Typically we us Trane Trace for load calcs and do our energy models in eQuest. However, this questions was brought up in our office. I just wanted to see what everyone thought of this matter.

 

Arturo Hernandez

 

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