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Re: [EnergyPlus_Support] Margin of error between monthly and annual simulation



E+ averages the data over the reporting frequency. If the simulation 
time step is less than 1 hour, then you could see an "average" of the 
weather data in the output. Try adding these inputs and see if the data 
match the weather file. I just tried this for a single day for Jan 2 and 
then for July 2 and the data matched the weather file in both cases.

Timestep,
1; !- Number of Timesteps per Hour

ConvergenceLimits,
60; !- Minimum System Timestep (minutes)


Abdul Murad Zainal Abidin wrote:
> Hello,
> I have send an e-mail regarding the above sometime ago but there was 
> no feedback.
> I have run monthly and annual simulation simulation using HAMT example 
> file with the preset weather file. I noticed that there was a margin 
> of error for the outdoor conditions (outdoor dry-bulb and outdoor 
> relative humidity) between monthly (e.g. March or November) and the 
> annual (March or November sections from the one year simulation) 
> output file. These error consistently occur on the first hour (01:00) 
> on the fiirst day of every month. Why must there be some margins of 
> error when I use the sam weather file?
> Thank you.
> Regards,
> Murad
>
> 

-- 
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
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