I am aware of different units. The Direct solar matches
very well, it is the diffuse. The difference I see in
the diffuse solar varies between locations. For some it
is about 25% difference so I don't think it is a
truncation issue. What I don't understand is that even
if the .bin file does include the diffuse, the weather
converter somehow calculates it. Could it be a problem
in the converter program?
On Fri, Oct 19, 2012 at 10:14 AM,
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
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
1) I downloaded the TMY3
DOE2 Weather files (.BIN) from the site (
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
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