[Bldg-sim] Food for thought....

Nick Caton ncaton at smithboucher.com
Thu Jun 28 09:51:05 PDT 2012

Hi Jim,

Using actual local weather data (AMY vs. TMY) corresponding to the utility bills being calibrated against is standard practice in my experience.  I started out using TMY weather and quickly ran into pitfalls as you're alluding to.

[cid:489575314 at 22072009-0ABB]


Smith & Boucher Engineers
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From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Arpan Bakshi
Sent: Thursday, June 28, 2012 11:44 AM
To: Jim Dirkes
Cc: bldg-sim at lists.onebuilding.org; EnergyPlus_Support at yahoogroups.com
Subject: Re: [Bldg-sim] Food for thought....

I would contact Zheng O'Neill. She was commissioned to do a similar study for the Dept. of Defense as part of her work at United Technologies, which she presented at IBPSA New York.


Arpan Bakshi  Sustainability Manager

sustainability consulting, education and analysis
217 Grand Street No. 802  New York NY 10013
D 646.704.2880

yrgxyz.com<http://yrgxyz.com/> | facebook<http://www.facebook.com/#%21/pages/YRG-sustainability/109166559111721> | twitter<http://twitter.com/#%21/YRGxyz>

On Thu, Jun 28, 2012 at 11:49 AM, Jim Dirkes <jim at buildingperformanceteam.com<mailto:jim at buildingperformanceteam.com>> wrote:
Dear Forums,
I am busy preparing a short talk for the Fall ASHRAE Energy Modeling Conference.  The topic is "An Approach for Calibrating Existing Building Energy Models to their Utility Consumption".
As part of the preparation, I will address the issue of how much difference might result in energy conservation measure savings predictions if you use actual weather data for the billing period versus TMY data.
To get a rough idea  how much variation there might be, I looked at Degree Days for a span of years.  What a variation! (for the city I'm studying at least)
I am not yet sure how that affects total energy consumption - you'll have to attend my presentation in Atlanta to find out :).
In the meantime, I am starting to think that existing building energy models should use actual weather, not TMY data.  Have any of you run similar comparisons for existing building models?

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