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Re: Re: [EnergyPlus_Support] Re: How to change the solar radiation calculation model in Energyplus [1 Attachment]



Hi, Chris

      I think the difference was caused by our incorrect direct normal irradaiton used in the weather data file. My weather data file is attached, can you help me calculate the direct normal irradiance? 

Regards

Jallen


2013/11/5 <chris@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
 

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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Attachment not found:
d:\eudora\attach\CHN_Hong.Kong.SAR.450070_PolyUHKEPW1.csv