[Bldg-sim] Normalization for actual weather

[Jeff Haberl]

Holly,

I don't agree with using PRISM for normalizing a simulation. PRISM is a variable based degree day method that was developed for weather normalizing heating energy use in residential. As such, for a commercial building, a VBDD might not be the best model. I'd suggest you see the 1050RP papers regarding the use of change-point linear models for use with commercial buildings that give you a superior fit to the data. 

Unfortunately, I can only think of one reason to normalize a simulation to actual year data, and that would be if you are comparing it to measured energy use data. Otherwise, there is no benefit in normalizing a simulation if you are using a TMY3 file. 

If you are comparing it to measured energy data. Then you need to drive the model with measured weather data, which makes a hugh improvement in fitting the model to the measured data, including predicting demand. 

However, the devil is in the details. For starters, I'd suggest you read the following:

Haberl, J., Bou-Saada, T. 1998. “Procedures for Calibrating Hourly Simulation Models to Measured Building Energy and Environmental Data,” ASME Journal of Solar Energy Engineering, Vol. 120, pp. 193 - 204 (August). 

Song, S., Haberl, J. 2008. “A Procedure for the Performance Evaluation of a New Commercial Building: Part I – Calibrated As-built Simulation”,  ASHRAE Transactions-Research, Vol. 114, Pt. 2, pp. 375-388 (June ).

Song, S., Haberl, J. 2008. “A Procedure for the Performance Evaluation of a New Commercial Building: Part II – Overall Methodology and Comparison of Results”,  ASHRAE Transactions-Research, Vol. 114, Pt. 2, pp. 389 – 403 (June).

You'll also find dozens of other papers on calibration of simulation models as well as MS and PhD thesis at our web site www.esl.tamu.edu under publications, as well as about 3,000 papers from the Hot and Humid, IETC and ICEBO conferences (on various other subjects).

Jeff

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Jeff S. Haberl, Ph.D.,P.E., FASHRAE..............jhaberl at 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, 77843..................URL:www.esl.tamu.edu

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________________________________________
From: bldg-sim-bounces at lists.onebuilding.org [bldg-sim-bounces at lists.onebuilding.org] on behalf of Pavel Dybskiy [pdybskiy at ryerson.ca]
Sent: Monday, January 30, 2012 3:15 PM
To: Holly W. Samuelson
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Normalization for actual weather

Hi Holly,

Attached pdf is what I presented for my course in 2009.
I did quick internet search and added my interpretations and examples.

After that I have discovered entire issue of Energy and Buildings, 9
(1 and 2) 1986 on PRISM that can give you more details and references
regarding weather adjustments.

Today's state of the art you may check  within the scope of two (2)
bigger and broader interrelated  topics: Calibration and Measurement &
Verification

One of useful sources off the top of my head  "International
Performance Measurement and Verification Protocol" and
www.evo-world.org September 2010 EVO 10000.

Regards,
Pavel

On Mon, Jan 30, 2012 at 2:32 PM, Holly W. Samuelson
<hsamuelson at gsd.harvard.edu> wrote:
> For model benchmarking purposes, I would like to normalize simulated energy
> data based on actual (versus typical) outdoor temperatures.  Do you know
> of a published methodology (methodologies)?  Thanks very much.
> Holly
> --
> Holly W. Samuelson
> Registered Architect | LEED AP BD+C
> Doctor of Design Candidate in Sustainable Design
> Harvard Graduate School of Design
>
>
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--
Best Regards,

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