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RE: Re: [EnergyPlus_Support] Re: How to change the solar radiation calculation model in Energyplus



A few days ago I commented about the sources of error in the direct/diffuse splitting method. In this case, other sources of errors exist: possible partial shading of the instrument due to obstructions, and ground albedo.

In addition, what is the source of your weather file? If it is TMY-type data, you cannot expect good correspondence of the modeled and measured data, since they are not for the same period.

We could comment better if you give more details: magnitude of the differences, location, source of data, ground albedo, differences between clear-sky and cloudy0sky conditions, etc.

 


--
Chris A. Gueymard, PhD
Solar Consulting Services
P.O. Box 392
Colebrook, NH 03576, USA
Florida's Office:
Tel. (386) 402-8949
www.SolarConsultingServices.com



---In EnergyPlus_Support@xxxxxxxxxxxxxxx, <jallenpeng@...> wrote:

I used the pyranometer to measure the solar radiation, although i am not sure if it is very accurate, but i think the error should not exceed 50 W/m2.


2013/11/5 Jill Dalglish <jill.dalglish@...>
 
I am interested in this question.  How are you measuring the solar radiation?



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