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

[Chris <chris@xxxxxxxxxxxxxxxxxxxxxxxxxxx>]

> My normal modelling site is within 200 miles of home (Grand Rapids, 
> MI) and I agree that "actual" solar data is hard to find.
>
> 2005 data is way _too old_ in my opinion, for modeling an _existing_ 
> building.  Building usage almost always is different that far in the 
> past and can be a significant factor in energy use.  I really want to 
> match up the most recent usage patterns (as reflected in utility 
> bills)  and weather in one model.
>
> I already subscribe to NNDC's data service, which is helpful.  They do 
> not report any solar information, however.  NREL does have some data 
> (with a lot of missing time periods for the closest station), but they 
> have a cloud cover data field which I'm hoping may be useful.  As 
> mentioned in a post roughly a month ago, wunderground.com also has 
> some good info.
>
> I'm still hoping that someone has incorporated actual cloud cover data 
> or an equivalent into an E+ weather file....
>

Yes, and this is done in the sophisticated models that predict solar 
radiation. But developing such a thing takes years and a lot of expertise...
You might find measured data of global radiation at 
http://www.solardatawarehouse.com/
and modeled data until the previous day from Clean Power, 
http://www.cleanpower.com/research.aspx.
I don't know their prices, though.
You can also get radiation _forecasts_ from AWS Truewind, 
http://www.awstruewind.com/.

Chris

-- 
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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