[Equest-users] Can DOE2 couple with CFD software?

[Haberl, Jeff]

Hello Yongqing:

I think I agree with Joe on this one.

There’s a BIG mismatch between the computation time for a simulation like DOE-2 and a 3D CFD simulation of a modestly complicated building. We found this to be true in the analysis of the Buddhist temple that was simulated with CFD and DOE-2 back in 2006 (see reference below and/or thesis). What we ended up doing was looking at specific days, then extrapolating to the rest of the year. The CFD did give some nice color contour plots that looked pretty groovy when we animated them.

I suspect that you find similar issues even today (i.e., 10 years later).

Jeff

REF: Sreshthaputra, A., Haberl, J., Andrews, M. 2004. “Improving Building Design and Operation of a Thai Buddhist Temple,” Energy and Buildings, Vol. 36, pp. 481-494. ESL-PA-04-06-01 (June).


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Jeff S. Haberl, Ph.D.,P.E.inactive,FASHRAE,FIBPSA,......jhaberl at tamu.edu<mailto:........jhaberl at tamu.edu>
Professor........................................................................Office Ph: 979-845-6507
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Energy Systems Laboratory...........................................FAX: 979-862-2457
Texas A&M University...................................................77843-3581
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From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Joe Huang
Sent: Monday, February 29, 2016 12:46 PM
To: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Can DOE2 couple with CFD software?

I think there's such a large difference in computational intensity (?) between DOE-2 (or any simulation program that models a thermal zone as a single node) and CFD that coupling the two together does not make sense to me, even if it could be done.  I think you're much better off looking into coupling DOE-2 to a multi-zone air-flow program like CONTAM or COMIS.  Even then, you have to exchange data back and forth at each time step, since air flows and zone air temperatures are so interconnected.  I spent more than a year in coupling EnergyPlus to COMIS back in 200-2002.
It would probably be easier to do in DOE-2 SYSTEMS, but would still require changes to the source code to call the airflow program at each time step.  Not trivial and not a "work around".  Thoughts from others would be welcomed.

Joe


Joe Huang

White Box Technologies, Inc.

346 Rheem Blvd., Suite 205A

Moraga CA 94556

yjhuang at whiteboxtechnologies.com<mailto:yjhuang at whiteboxtechnologies.com>

http://weather.whiteboxtechnologies.com for simulation-ready weather data

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On 2/29/2016 7:52 AM, 冷面寒枪 wrote:

Hi,everyone

I want to invesitigate nature ventiation's impaction on building energy.However,nature ventilation feature has many restrictions in eQUEST.So I consider coupling DOE2 with CFD software such as fluent to analysis the energy saving potential of nature ventilation.Any suggestion?

Thanks you!

------------------
Yongqing Zhao
Changsha Green Building & Energy Saving Technology CO.,LTD
NO.438,Shaoshan Road,Changsha,Hunan,China
Telephone:13574805636
Email:zhaoyongqing1987 at 126.com<mailto:Email:zhaoyongqing1987 at 126.com>
         503271081 at qq.com<mailto:503271081 at qq.com>





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