[EnergyPlus_Support] Re: Food for thought....

["aleagerman22" <agerman@xxxxxxxxxxxxxxx>]

Hello,
Your point is a great one that AMY & TMY data can differ significantly and I would agree that any model calibration needs to consider calibration to actual weather at some level, whether it is through the direct use of hourly AMY weather data or normalization to CDD/HDD. We generally don't do any comparison to utility bill data without actual weather data.

There are some cases when existing home modeling should be done with TMY data. For estimation of average savings, even in existing homes, TMY data is a valuable tool. Even when a calibrated model is developed, bringing TMY data back in is an important step for future year estimations.


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Jim Dirkes" <jim@...> 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 J.
> 
> 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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