[Bldg-sim] model radiant ceiling for heating and cooling in e-Quest

Hussein Abaza ahussein at spsu.edu
Wed Nov 7 17:42:05 PST 2012

Dear All 
I am trying to model radiant ceiling for heating and cooling. Is there any better way than using fan coil units with turned down fans as the e-quest archive suggests? 
Thank you in advance 

----- Original Message -----

From: "David BRADLEY" <d.bradley at tess-inc.com> 
To: "Karol Bandurski" <karol.bandurski at put.poznan.pl> 
Cc: trnsys-users at cae.wisc.edu, bldg-sim at lists.onebuilding.org 
Sent: Thursday, October 18, 2012 10:02:42 AM 
Subject: Re: [Bldg-sim] [TRNSYS-users] TYM2 weather data 

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, 

On 10/18/2012 05:22, Karol Bandurski wrote: 

Dear All, 

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… 

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!!! 

Karol Bandurski MSc. 
Institute of Environmental Engineering 
Poznan University of Technology 

TRNSYS-users mailing list TRNSYS-users at cae.wisc.edu https://mailman.cae.wisc.edu/listinfo/trnsys-users 

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22 North Carroll Street - suite 370
Madison, WI  53703 USA

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