[Bldg-sim] Building Energy Modeling Guidelines

Jeff Haberl jhaberl at tamu.edu
Sun Mar 4 15:05:50 PST 2012


O.K.



Here goes...



Jeff



________________________________
From: pdybskiy at gmail.com [pdybskiy at gmail.com] on behalf of Pavel Dybskiy [pdybskiy at ryerson.ca]
Sent: Sunday, March 04, 2012 3:48 PM
To: Jeff Haberl
Cc: Paul Carey; 韩星; Ellen Franconi; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Building Energy Modeling Guidelines

Jeff,

1) Is it correct to say that any problem discussed on this list can be answered by referring to some of sources that were just mentioned?

I have always found that the sample files that come with DOE-2 and EQUEST provide advise on how to model 90% of most buildings. The 10% would include things that can't be modeled well with DOE-2 and/or EQUEST including: atriums, borrowed-lite windows (i.e., glass on an inside partition), courtyard buildings with interior gardens (i.e., evaporative cooling that leads to different temps in the courtyard -- see John Reynolds book). If one adds the 17 DOE EnergyPlus files, then you could make that 95%.

2) More general.. Can you give an estimate on how many professionals in BEM community (ten, hundred, thousand) are, let's say, 100% educated, 'self-sufficient', capable of demonstrating the ultimate level of knowledge?

Whew! I think there are about 100+ or so ASHRAE Certified BEM modelers...which grows every month. Conservatively, if you doubled or tripled that number to include good modelers that have not taken the exam, then you might have a few hundred folks that are certified or equivalent.

If you want to know those who are capable of demonstrating the ultimate knowledge, you'd have to be code-specific, and then I would guess there are probably less than 20 persons per code or less that really know what they are doing well enought to write rewrite the code (i.e., DOE-2), or edit the FORTRAN and recompile the code. Unfortunately, many of the folks who wrote the original algorithms for DOE-2 and BLAST (a part of EnergyPlus) are no longer around.

In the case of EnergyPlus, I would guess there are maybe 20 people that really know the code well enough to edit it and/or write new modules. Obviously, those who worked on it, and a few more, that's about it.

For TRNSYS, the number is probably smaller. In the U.S. the source of most knowledge about TRNSYS is in Wisconsin (i.e., TESS or UofW-M).

3) More specifically.. From your experience, what is an average percentage of  graduates from your school  who becomes an expert in BEM?

I've always believed that it takes about 10 years of constant use to become expert. I educate about 10 to 20 persons per year, and have done so for 27 years. So, about 1/2 of my students may or may not have been praticing for 10 years, which brings them into the realm of becoming expert. Our current staff at the ESL who work on our code-compliant web-based calculator are all expert level (...they now teach me!).
4) More on this... How many BEM schools are there in US?

I'm sure I'll insult someone here...

Can you name them?
I can name schools where I know folks: MIT, PSU, TAMU, UT, OSU, CU, UC Berkeley, UofI, ASU, UofW-Milwaukee, UofW-Madison, UofW-Milwaukee, Purdue,UPenn, Cornell, CUNY, U.Kansas...and others.

Jeff

+++++++++++++++++++++++++++++++++++++++++++++++++++

Thank you,

Pavel Dybskiy


2012/3/4 Jeff Haberl <jhaberl at tamu.edu<mailto:jhaberl at tamu.edu>>

Ellen,



Here's a few more:



1. In a way the sample files that come with DOE-2.1e are showing you examples of buildings that LBNL assembled to go with DOE-2. You can view these with DrawBDL. However, there is only limited text that explains he intent of the file, and now guideline so to speak about modeling a building, in general.



In a similar fashion, EQUEST comes with input files that you can view as well that pretty much cover the full range of building types.



Finally, the DOE EnergyPlus standard 17 building type files (that came originally from Joe Huang I'm told) are also examples of how to model different building types.



There are also the books by Joe Clarke, Godfried Augenbroe, Jan Hensen/Roberto Lambert on simulation that provide varying advice on simulation.



Also, TRNSYS has lots of files in their library that show how to model different things (mostly systems), that are useful as well.



Problem is with any guide, anywhere is that, at some point,  is has to be specific to a particular simulation program, or else it becomes so general that it loses it meaning.



If you want something that is really interesting, look at the 1958 ASHRAE paper by Buchberg that talks about modeling a one room hut using an analog electrical circuit...this was the start of it all.



Jeff





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Jeff S. Haberl, Ph.D.,P.E., FASHRAE..............jhaberl at tamu.edu<mailto:FASHRAE..............jhaberl at tamu.edu>

Professor............................................................Office Ph: 979-845-6507<tel:979-845-6507>

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________________________________
From: bldg-sim-bounces at lists.onebuilding.org<mailto:bldg-sim-bounces at lists.onebuilding.org> [bldg-sim-bounces at lists.onebuilding.org<mailto:bldg-sim-bounces at lists.onebuilding.org>] on behalf of Paul Carey [paul at zed-uk.com<mailto:paul at zed-uk.com>]
Sent: Sunday, March 04, 2012 2:53 AM
To: 韩星; Ellen Franconi
Cc: bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>
Subject: Re: [Bldg-sim] Building Energy Modeling Guidelines

Ashrae 90.1 isn't a guideline? Its a set of massively prescriptive and defined rules for assessing buildings against benchmark buildings.

We have a similar document to some extent in the UK. The national calculation methodology document that accompanies the iSBEM energy calculation tool available from the BRE outlines how to model in accordance with UK regulations or at least it does to some extent.

Ok whilst writing this I've altered my opinions and so both are probably worth adding to list as they do have  some useful information on how to define zones, etc rather than just being code style documents.

Kind regards

Paul



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----- Reply message -----
From: "韩星" <foolishstar at 163.com<mailto:foolishstar at 163.com>>
Date: Sun, Mar 4, 2012 03:02
Subject: [Bldg-sim] Building Energy Modeling Guidelines
To: "Ellen Franconi" <efranconi at rmi.org<mailto:efranconi at rmi.org>>
Cc: <bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>>


Of course ASHRAE 90.1 APPENDIX G is the most popular guideline I think




At 2012-03-04 06:05:51,"Ellen Franconi" <efranconi at rmi.org<mailto:efranconi at rmi.org>> wrote:
I am compiling a list of published Building Energy Modeling Guidelines. I know of a few and was hoping to get some help from all of you to fill it out. This is what I know of:

1) CIBSE Applications Manual AM11: 1998, Building Energy and Environmental Modelling. The manual is available to members of the United Kingdom organization - the Chartered Institution of Building Services (CIBSE).

2) From the Colorado Governor's Energy Office, ENERGY MODELING: A GUIDE FOR THE BUILDING PROFESSIONAL. See http://rechargecolorado.org/images/uploads/pdfs/Energy_Modelling_062411.pdf

3) AIA Modeling Guidelines (believe there is a draft out for public review) but what I find on their website is:
An Architects Guide to Integrated Modeling Within the Design Process

4) GSA BIM to BEM also out for public review,see: http://www.gsa.gov/portal/content/105075

5) ASHRAE Research Project 1468 BIM to BEM,

What have others come across?

--
Ellen Franconi, PhD, LEED AP, BEMP
Senior Consultant, Built Environment Team

Rocky Mountain Institute
1820 Folsom Street
Boulder, CO 80302
303.567.8609<tel:303.567.8609> (Desk)
303.245.7213<tel:303.245.7213> (Fax)

Rocky Mountain Institute drives the efficient and restorative use of
resources, creating a world thriving, verdant, and secure, for all, for ever.

http://www.rmi.org



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--
Best Regards,

Pavel Dybskiy
M.A.Sc<http://M.A.Sc>. Candidate, Department of Architectural Science
Faculty of Engineering, Architecture and Science, Ryerson University
E-mail: pdybskiy at ryerson.ca<mailto:pdybskiy at ryerson.ca>;
telephone: 647-984-4940
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