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Re: [EnergyPlus_Support] Re: Modifying a weather file to reflect "real" weather





From Auxiliary Programs manual, page 55:
"Historical weather data files in CD144 format do not contain solar data nor is such data
generally available for a specific location and time period. In this case, ersatz solar data must
be generated from cloud cover and other data using sky models and regression formulas.
Currently, neither the Weather Conversion utility nor the EnergyPlus program synthesizes
this data. However, the weather conversion utility can use any two of the commonly recorded
data (i.e. two of Global Horizontal Radiation, Horizontal Diffuse Radiation and Direct Normal
(or Direct Horizontal) Radiation to calculate the EnergyPlus primary solar data of Direct
Normal and Horizontal Diffuse Radiation values)."

This states that two solar values must be entered to derive the others.

Please tell us more about how to derive direct normal and diffuse irradiation in the Weather Converter with just global horizontal.

Thanks!

--- On Fri, 6/5/09, Linda Lawrie <linda@xxxxxxxxxxxxxx> wrote:

From: Linda Lawrie <linda@xxxxxxxxxxxxxx>
Subject: Re: [EnergyPlus_Support] Re: Modifying a weather file to reflect "real" weather
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Date: Friday, June 5, 2009, 7:53 AM

The weather converter will currently do what you want -- create the appropriate values from global horizontal.  (custom data) It works with the existing data that you have.

EnergyPlus Development Team

 At 04:13 AM 6/5/2009, le_carambar wrote:

You said : "I've used their data for Northeast US sites for a number of years now.  With regard to insolation, they only model global horizontal insolation, however.  You have to do some work to derive components you might need."

I have global radiation data too, and I would like do approximation to create an epw file. Horizontal Infrared Radiation intensity, Direct Normal Radiation and Diffuse horizontale radiation are needed.

Have you hint to help me do this job ? (link, equation...)




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