[Bldg-sim] LEED Energy Modeling with eQUEST

[Bishop, Bill]

Hi Janne,

 

For figuring out the unmet load hours, the 300 hours per year is out of the 8,760 hours simulated. If every zone in the building simultaneously experiences an unmet load (such as when heating is first turned on after the building is allowed to get very cold), that only counts as one hour (or maybe two or three for a heat pump). The BEPS and BEPU DOE 2.2 reports show the percent of hours outside of throttling range. My understanding is that if this value is 3.4% or less (300/8760) than the condition is met.

 

Bill

 

William Bishop, EIT, LEED® AP | Pathfinder Engineers LLP

Mechanical Engineer

 

3300 Monroe Ave., Suite 306 
Rochester, NY  14618

TEL (585) 218-0730 Ext. 114
FAX (585) 218-0737 

bbishop at pathfinderengineers.com

 

www.pathfinderengineers.com

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From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Kairento, Janne
Sent: Monday, January 12, 2009 9:36 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] LEED Energy Modeling with eQUEST

 

Hey All, 

 

I am curious as to how to break up the thermal blocks in eQUEST. eQUEST allows each zone to be broken down into different space types by percentage. According to Appendix G, Table G3.1, Section 7, three conditions have to be met in order to clump thermal blocks together: the space use classification has to be the same, they have to have exposure to one façade (or a façade with a <45 deg bend), and they have to be served by the same type of HVAC equipment. When a large zone is created based on the area being conditioned by a HVAC system, breaking down the spaces by the percentage doesn't meet the three conditions required. If spaces are broken down according to the ASHRAE requirements, it often leads to a large amount of zones. If all zones have at least 1 hr. of unmet heating or cooling, and there are greater then 300 zones, the model will exceed the amount of hours allowed. Any suggestions on an approach on zoning to simplify the model that meets ASHRAE requirements?

 

Thanks, 

Janne

 

Janne Kairento, E.I.T., LEED AP  
Cosentini Associates 
One Broadway 
Cambridge, MA 02142 
Phone: 617.494.9090 
Fax:  617.494.9292 

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