Re: [EnergyPlus_Support] solar calculation

[Fred Buhl <wfbuhl@xxxxxxx>]

See comments below

Fred Buhl

Ery Djunaedy wrote:
> All,
>
> A significant portion of the simulation time in EnergyPlus is taken by
> the solar calculation, calculating the insolation and shading. For a
> large model, especially with detailed window definition, it is painful
> to repeat the simulation because of this.
>
> Is there a way where we do this once, and keep the result (of
> insolation and shading calculation) in a file, and then refer to the
> file during the annual simulation? Obviously, the insolation and
> shading calculation will be exactly the same for every geometry. If we
> do not change the geometry of the building (and the shading devices
> and obstructions), there no need to repeat this calculation every time
> we run the simulation.
>   
This capability doesn't exist, and as far as I know has never been 
considered. It's a good idea and would
be very useful in some applications.
>
> EnergyPlus has shd file as an OUTPUT. If this is the result of the
> shading and insolation calculation, is there a way we can use this
> file as an INPUT? If it is possible, I think the simulation time will
> be MUCH faster.
>   
No, that is not currently possible.
> I would be very glad if this is possible, but I could not find it
> anywhere in the manual.
>
> A wishlist entry, probably?
>   
Yes, and thanks for the suggestion!
> Cheeers,
>
> Ery
>
> PS. This option is available in ESP-r. Shading and insolation is
> calculated as part of model development. You do it once, and include
> the file for every simulation using the same geometry.
>
>
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
>
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
>
> Attachments are not allowed -- please post any files to the appropriate folder in the Files area of the Support Web Site.
>
> EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
>  
> Yahoo! Groups Links
>
>
>
>   


The primary EnergyPlus web site is found at:
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The group web site is:
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Attachments are not allowed -- please post any files to the appropriate folder in the Files area of the Support Web Site.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
 
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