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Re: [EnergyPlus_Support] TMY3 Weather files


How big are the differences?  They could be due either to round-off errors and in conversion to EPW. The weather data in a DOE-2 *.bin file are stored in  integer F for temperature, integer BTU/ft2-hr for radiation, 0.1 knots for wind speed, and octets for wind direction.   Why are you doing this?  You're doing a double translation from TMY3 (in metric) to BIN/FMT (in IP) back to EPW (in metric). 

Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 108D
Moraga CA 94556
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"

On 10/19/2012 10:04 AM, 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).


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