[Bldg-sim] eQuest - Model verification

[Will Mak]

Isn't that the suggested guideline for when you are shooting for the M&V credit also?

 

William Mak, LEED Green Associate
Mechanical Design Engineer

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From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of R B
Sent: Friday, April 29, 2011 9:50 AM
To: Katherine Louman-Gardiner
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] eQuest - Model verification

 

There is a ASHRAE guideline that outlines the metrics for deciding when the model is calibrated - ASHRAE guideline 14. Also it is alluded to by the RMI modelling workshop slides. The CVRMSE is around 10%, and the monthly ERR is 15%. I usually look at these numbers for electric and gas separately.

How many people follow the ASHRAE guideline for calibration and are there any other metrics out there?

 

Thanks

-Rohini

On Thu, Apr 28, 2011 at 12:48 PM, Katherine Louman-Gardiner <klgardiner at flowgroup.ca> wrote:

Hi All,

Our client would like us to produce an eQuest model that

a)      Can be easily adjusted to include current and recently recorded weather data

b)      Can be easily adjusted to reflect space occupancies and lighting loads

c)       Will reflect the actual building energy usage to within 1%

Do any of you have experience trying to validate models like this?  

My concern is that models are approximations, and will not account for small changes in occupancy, outdoor weather, etc.  

I guess my questions are these:

1)      Even if I manage to put in daily occupant and fan schedules based on actual use, will the model be accurate enough to take me within 1%?

2)      We have been asked to remove plug loads (both for consumption purposes and cooling loads).  Will this be too big of an assumption to get any accuracy out of the model in the future?

3)      How do I modify the weather input file?

4)      Are there any other ideas I'm missing that will help us validate a model as an absolute measure of actual building energy consumption?

Thank you for your help,
Katherine

 

Katherine Louman-Gardiner, EIT

Mechanical Engineer

 


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