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Re: [EnergyPlus_Support] Re: Modifying a weather file to reflect "real" weather
- To: EnergyPlus_Support@xxxxxxxxxxxxxxx
- Subject: Re: [EnergyPlus_Support] Re: Modifying a weather file to reflect "real" weather
- From: Chris <chris@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Tue, 02 Jun 2009 18:35:56 -0400
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I know at least 100 papers that have been devoted to this question, most
of them proposing a simple empirical formula to obtain either the IR
(aka thermal or longwave) irradiance, or equivalently the sky
temperature or the sky emittance. Most of them, however, are for clear
skies only (when the sky temperature is significantly lower than the the
air temperature). Still. some offer models for overcast and
partly-cloudy conditions.
Chris
> Adding to the discussion, the weather file needs solar radiation data which could be estimated based on the total horizontal solar radiation which could be "cheaply" recorded, but eplus also requires the horizontal IR radiation, for which I have yet to find a method to estimate it using normally reported weather data (like temp, humidity, wind speed and direction, rain).
>
>
>
--
Chris A. Gueymard, PhD
Solar Consulting Services
P.O. Box 392
Colebrook, NH 03576, USA
Tel. (603) 237-8550
Fax (603) 237-5314
http://www.SolarConsultingServices.com
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