Re: [EnergyPlus_Support] diffuse and direct solar

[Adriana Angelotti <Adriana.Angelotti@xxxxxxxxx>]

Dear Linda,

you are are right. 
If I perform my simulation with a time step of one hour, then solar
radiation outputs
exactly match the inputs in the weather file. 
If I use a smaller time step and ask for hourly reported solar radiation
data,
they don't match the input.

Thank you very much

Adriana Angelotti

 
At 09.29 18/11/02 -0600, you wrote:

> If you use an hourly time step and
> reporting, you should see the same values reported.  If you are
> using less than hourly time steps in your EnergyPlus input, things will
> get a bit confusing due to EnergyPlus Weather Interpolation and the
> "summing" of these values when reported.
>
> Solar radiation values have a particular problem in EnergyPlus reporting
> and the interpolation scheme as they are not "continuous"
> values (like dry bulb where not much variation happens during the course
> of a day) and the interpretation of the data coming from weather sources
> is also a bit confusing.  
>
> ....
>
> In practice, virtually all energy analysis programs treat the incoming
> solar radiation as an "instantaneous" value.  This works
> well for hourly programs which only have one value to deal with. 
> EnergyPlus has a compounding problem here -- because it must determine
> how to break up that hourly value into several time steps (unless the
> time step input is hourly).
>
> Linda
>
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