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Re: [EnergyPlus_Support] WeatherData Problem with direct radiation and diffuse radiation

You need to be careful of cloud cover data.  For many weatther stations it is an estimated value picked from a list of very few options (0,25,50,88,100%) and all too often ignored by the operator.  Variables derived from this then are problematic.  If you send us your site I will send you a 30 yr TMY (or a single actual year file if you want) no charge.  It contains Global, Direct and Diffuse aloing with all the other weather variables and will be in E+ format.
Let me know,
Chuck, Weather Analytics

From: vicentina_0350024 <vicentina_0350024@xxxxxxxxxxxx>
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sent: Thu, April 21, 2011 8:34:57 PM
Subject: [EnergyPlus_Support] WeatherData Problem with direct radiation and diffuse radiation



I was trying to get Normal Direct Radiation and Diffuse Horizontal Radiation via weather converter. (the only data I got is Global Horizontal Radiation.) After converting, the data of Normal Direct Radiation show up with figures but Diffuse Horizontal Radiation are all zero.

How could I get diffuse horizontal radiation?
Is there other data I need to input to make it calculate?



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