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Re: [EnergyPlus_Support] Strange Dates in Daylighting Map

Both those files you are viewing are from Cairo Egypt, with the same 
WMO number so the weather program seeks out the Climate Design Data 
stats from the 2005 ASHRAE HOF.  That is why the top part of the 
stats look similar.

Both sources of the data are "typical years" though the methods of 
selection may have been different, you can read about ETMY and IWEC here:
http://www.eere.energy.gov/buildings/energyplus/weatherdata_sources.html

and decide which one is probably best for your purposes.  You can 
also read about

You also might look for this article:
Crawley, Drury B. 1998. "Which Weather Data Should You Use for Energy 
Simulations of
Commercial Buildings?," ASHRAE Transactions, 104 Pt. 2. Atlanta: ASHRAE.

You will have to use your engineering judgement to determine which file to use.


Linda

EnergyPlus WebSite: http://www.energyplus.gov
Owner: EnergyPlus_Support list
Member: EnergyPlus Development Team



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