Re: [TRNSYS-users] TYM2 weather data

[David BRADLEY <d.bradley@tess-inc.com>]

Karol,
  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+, etc.)
Kind regards,
 David

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

Poznan University of Technology

www.ee.put.poznan.pl

www.put.poznan.pl

 

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