[Bldg-sim] DOE2 peak loads and equipment sizing

[Sean Henry]

Thanks Jeff, that’s I good point. I appreciate your summary of the differences between those report types.

In my particular case the “major” differences I’ve encountered between LOAD and SYSTEM were much larger than what’s reasonable for ventilation/exhaust/economizer.

Any thoughts?

 

SP Henry-“the tired troubleshooter”

 

From: Jeff Haberl [mailto:jhaberl at tamu.edu] 
Sent: Tuesday, March 24, 2009 7:36 PM
To: Sean Henry; 'bldg-sim at lists.onebuilding.org'
Subject: Re: [Bldg-sim] DOE2 peak loads and equipment sizing

 

Whoa!

Hugh differences by design!

LOADS reports are just that...space heating and cooling loads plus assigned electric loads, which includes occupants, schedules, etc. All at constant thermostat temps for each SPACE. 

SYSTEM loads are the loads on the air-side systems, which are system dependent, and include ventilation loads, exhaust fans, thermostats, economizers, etc. 

PLANT adds yet another layer of equipment, etc.

Therefore, values from SYSTEMS or PLANT are best used for sizing depending on system type. 

Jeff 
BB 8=! 8=) :=) 8=) ;=) 8=) 8=( 8=) :=') 8=) 8=) 8=? BB 

Jeff S. Haberl, Ph.D., P.E., FASHRAE...................jhaberl at esl.tamu.edu 

Professor......................................................Office Ph: 979-845-6507 

Department of Architecture.......................Lab Ph: 979-845-6065 

Energy Systems Laboratory.......................FAX: 979-862-2457 

Texas A&M University..............................77843-3581 

College Station, Texas, USA.......................URL: www-esl.tamu.edu 

BB 8=/ 8=) :=) 8=) ;=) 8=) 8=() 8=) 8=? 8=) 8=) 8= BB 

________________________________

From: bldg-sim-bounces at lists.onebuilding.org 
To: bldg-sim at lists.onebuilding.org 
Sent: Tue Mar 24 18:12:48 2009
Subject: [Bldg-sim] DOE2 peak loads and equipment sizing 

Dear Bldg-Sim users,

 

In DOE2 , have any users come across major differences between building peak cooling loads (in the LS-D reports) and the maximum cooling loads listed in the SS-D reports?

I’m troubleshooting equipment sizing in a DOE2 model and I’m trying nail down some reasonable explanations for the disparities in the loads. 

I would appreciate any words of wisdom.

 

SP Henry

Glumac

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