Re: [EnergyPlus_Support] creating 'real' weather files - Wind/solar data

[Linda Lawrie <linda@xxxxxxxxxxxxxx>]

I'm not sure how you got out of that document that
EnergyPlus calculates the radiation values...

Yes, for design days, the simple (now out of date) ASHRAE clearsky
algorithm is used.  And some other algorithms can be used (caveat
emptor)

And yes, the weather converter will try to supply radiation values but
again, the algorithm used may or may not be accurate.  Mostly
weather data comes in tact or with at least two of the important
components for solar radiation (Global Horizontal, Direct Normal or
Horizontal, and Diffuse Horizontal).

Accurate "estimates" for other solar radiation are being
investigated but often the data that is needed for accurate calculations
is not supplied by the weather stations.

EnergyPlus Development Team

At 09:01 AM 6/16/2009, Arslan Djumaev wrote:
> Please take a look at page three
> of the attached document and under the section "Solar and Shading
> Calculations" you'll find that E+ calculates all the radiation
> values needed from your location and geometry input. I was confused as to
> how E+ calculated radiation values at first as well when I saw that the
> standard weather files have no radiation data and then I stumbled upon
> this document.

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