[Bldg-sim] [TRNSYS-users] TYM2 weather data

David BRADLEY d.bradley at tess-inc.com
Thu Oct 18 07:02:42 PDT 2012

   Without knowing the specifics of which data file you are using, its 
hard to give a definitive answer. My understanding is that the original 
set of TMY2 weather files are a series of files that were developed at 
NREL for 230 or so sites in the US based on something called the Solmet 
data base. Only 30 sites actually had measured data; the rest were 
modeled, correlated, statistically processed, etc. The original set of 
TMY2 data files for those US cities should not, I think, be confused 
with the use of the TMY2 file format for weather files from other cities.

   As for your other question, there is no particular need to create a 
file that has the TMY2 format if you don't want to. Type9 is designed to 
read an interpolate data files. Radiation data read by Type9 can then be 
passed to Type16 for processing and calculation of radiation falling on 
other surfaces. This saves you the trouble of having to figure out where 
to obtain data values for the fields that you don't need in the TMY2 
format. Type15 (the weather reader/processor) is really just a 
combination of Type9 and Type16 glued together internally and given the 
ability to read a series of standard file formats (TMY, TMY2, TMY3, E+, 
Kind regards,

On 10/18/2012 05:22, Karol Bandurski wrote:
> Dear All,
> 1)
> I have already converted TYM2 data for Poznan 
> (PL-Poznan-Lawica-123300) from text file to excel using: 
> http://sel.me.wisc.edu/trnsys/weather/tmy2data.htm.
> Some of meteorological data, which are there, have additional columns 
> named /Flag of Data Source/. Dry bulb temperature is one of these 
> data. In my file is written that *_data source for dry bub temperature 
> is_* E, and in TYM2 manual 
> (http://rredc.nrel.gov/solar/pubs/tmy2/PDFs/tmy2man.pdf) I have read 
> that it means:
> Modeled or estimated, except: precipitable water, calculated from
> radiosonde data; dew point temperature calculated from dry bulb
> temperature and relative humidity; and relative humidity
> calculated from dry bulb temperature and dew point temperature
> *Could you explain me what it is mean? I expected that temperature is 
> measured...*
> 2)
> *_The second issue_* is that I would like to create my own TYM2 file 
> to run TRNSYS simulation with my own meteorological data. How should I 
> model e.g. illuminance... of maybe I don't need this value if I use in 
> simulation only:
> ·Dry bulb temperature,
> ·Effective sky temperature,
> ·Humidity,
> ·Wind velocity and direction,
> ·Atmospheric pressure,
> ·Solar zenith and azimuth angle,
> ·Total surface radiation,
> ·Beam surface radiation,
> ·Angle of incidence for surface,
> ·Ground reflectance.
> *Which data (columns) do I need in TYM2 file to get above values?*
> I will be grateful for any tips!!!
> Regards
> ------------------------------------------------
> Karol Bandurski MSc.
> Institute of Environmental Engineering <http://www.ee.put.poznan.pl/>
> Poznan University of Technology
> www.ee.put.poznan.pl <http://www.ee.put.poznan.pl/>
> www.put.poznan.pl <http://www.put.poznan.pl/>
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at cae.wisc.edu
> https://mailman.cae.wisc.edu/listinfo/trnsys-users

Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

d.bradley at tess-inc.com


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