[Bldg-sim] Energy model calibration - normalizing the utility bills to month start-end

[Joe Huang]

Maybe I'm missing something here, but why can't you just count up the degree days for the 
utility period?
I hope you're not working with average or "typical year" degree days, but the degree days 
from the same time period.

I also recall that the old Princeton Scorekeeping Method (PRISM) back in the 1980's allows 
the user to enter the degree days for that time period, so it's not a new problem.

Joe

Joe Huang
White Box Technologies, Inc.
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yjhuang at whiteboxtechnologies.com
http://weather.whiteboxtechnologies.com for simulation-ready weather data
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On 6/22/2015 6:09 AM, Jones, Christopher wrote:
>
> When calibrating an energy model to utility bills the utility bills often don’t align 
> with the month start and end.  I have reviewed a couple methods to calendar normalize 
> the utility bills but find them somewhat unsatisfactory.
>
> For example the method I am looking at does the following:
>
> The April gas bill runs from March 25 – April 24.  The algorithm takes the average 
> number of m3 per day from that bill, applies it to the days in April.  Then it takes the 
> average number of days from the May bill which runs from April 24 – May 25 and applies 
> that average to the remaining days in April.
>
> The issue is that the March-April period has much higher HDD than the April-May period 
> and the “normalized” gas usage is significantly lower than the simulation data for April.
>
> I am wondering if there are any papers or other sources of information as to how others 
> approach this problem.
>
> cid:image003.png at 01D09C46.E75BA0D0**
>
> *Christopher Jones,***P.Eng./
> /Senior Engineer**
>
> **
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