Re: [EnergyPlus_Support] TMY3 Weather files

[Linda Lawrie <linda@xxxxxxxxxxxxxx>]

One simple note is that the .bin files have solar radiation
in IP units (BTUH) vs EPW files in Wh/m2). So there is a
translation.
Plus, the .bin files have Total Solar/Global and Direct.  But no
diffuse.  So, another translation.

oh, and you need to unpack the .bin to FMT which may truncate some of the
values -- depending on the precision used.

Wind direction should be a direct copy unless how the original TMY3 was
converted differed.

 At 11:04 AM 10/19/2012, mehry1205 wrote:
> I am making some DOE2 and
> EnergyPlus comparison runs, I want to make sure I use the comparable set
> of weather files for both. Here is what I did:
> 1) I downloaded the TMY3 DOE2 Weather files (.BIN) from the site
> (
> http://www.whiteboxtechnologies.com/weather_data.html)
> 2) I Then used EnergyPlus weather converter to get epw from the .BIN file
> (I first created the .fmt and then ran weather converter on the .fmt).
> 3) When I made the comparison runs, I see that the diffuse Horizontal
> solar is different between the two programs.
> 4) I compared the translated EPW file to the EPW file that I get from
> EnergyPlus Website. I see that the diffuse Horizontal solar is also
> different between the translated EPW and the distributed EPW. 
> 5) I also see some differences in wind direction between the two EPW
> files.
> I need to understand why there is a difference and how to make sure I use
> the comparable weather files (BIN and EPW).
> Thanks

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