[Bldg-sim] Recommended reading on comparison of models to actual?

[Jeremiah Crossett]

Everyone,
Thanks for the responses.

Tianzhen, thanks for the link.
Zheng, thanks for the recommended reading.
Matt, thanks for the link.
Holly, thanks for the information and yes, please do send your case
studies.


Cheers!




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*Jeremiah D. Crossett  | Senior Analyst  |  Phase Change Energy Solutions*
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120 E. Pritchard St.  | Asheboro, NC 27203  | Mobile 503-688-8951
www.phasechange.com
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On Tue, Jun 25, 2013 at 6:01 PM, Samuelson, Holly Wasilowski <
hsamuelson at gsd.harvard.edu> wrote:

>  Dear Jeremiah,
> I recently completed my dissertation on reusing today's design-phase
> (compliance) energy models post-design, focusing on a building owner's
> perspective.  For #2, "How does a proposed building typically stack up
> against the utility bills?", I'd say it partially depends on the original
> purpose of the model.  Was the modeler trying to predict utility bills, or
> rather demonstrate compliance with a code/standard? For example, for
> LEED-compliance models under older LEED (ASHRAE 90.1) protocol, modelers
> made default assumptions regarding plug-loads.  This could lead to very
> inaccurate models, especially for energy-intensive programs such as labs or
> data centers.  I have some case studies, but they're essentially specific
> to these older versions of LEED. I'm not sure if that's helpful to you.
>
>  For #3, "How accurate should an existing building model be to be
> considered useful?", I'd say it depends on what you're trying to do with
> the model. Test future retrofits? Benchmark the building? Detect subtle
> equipment faults?  I have a couple case studies that involved such major
> building faults that even relatively  poorly-calibrated models (per ASHRAE
> 14 definitions) helped detect the problems.  Again, I'm not sure if that's
> relevant to you.
>
>  I'm happy to share my findings if they're relevant.  Please contact me
> if this sounds like it might be helpful.
> Best,
> Holly
>
> Holly W. Samuelson
>  Doctor of Design | Registered Architect | LEED AP BD+C
> Lecturer Harvard Graduate School of Design
>   ------------------------------
> *From:* Jeremiah Crossett [jcrossett at phasechange.com]
> *Sent:* Monday, June 17, 2013 10:08 PM
>
> *To:* bldg-sim at lists.onebuilding.org; Terry Puccini
> *Subject:* [Bldg-sim] Recommended reading on comparison of models to
> actual?
>
>  Dear bldg sim,
>
>  I am looking for papers that elaborate on the concept of modeling, and
> how it correlates to actual utility data to share with people within my
> company.
>
>  The questions keeps popping up, eg..
>
>    1. How does a baseline building compare to an average building?
>    2. How does a proposed building typically stack up against the utility
>    bills once the building is built?
>    3. How accurate an existing building model should be to be considered
>    useful, and how accurate is typically possible?
>    4. For an experimental setup what would be considered to be close
>    enough to be considered a "validated" model?
>
> My understanding is that modeling is to show relationships between average
> a baseline of a chosen vintage and that of a proposed design in terms of
> relative percentages.  For existing buildings I think that useful is within
> 20% and typically possible is 10%. Then for a validation model, the most
> important factor is similar curves and close totals.
>
>  If anyone has any recommended papers, or personal experience it would be
> appreciated.
>
>  Kind regards
>
>
>
>
>  *
> *
>  *Jeremiah D. Crossett  | Senior Analyst  |  Phase Change Energy Solutions
> *
> *
> 120 E. Pritchard St.  | Asheboro, NC 27203  | Mobile 503-688-8951
>  www.phasechange.com
> *
>
> *
> *
> *
> *
>
>
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