[Bldg-sim] Revised TMY3 Weather Files now available on the Web

[Julien Marrec]

Robert,

There are a number of free plugins and libraries to do such calculations.
That's includes some in Excel (VBA-based), such as Numerical Logic
<http://www.numlog.ca/psychrometrics/psychrometrics.html> (I've used this
one succesfully-avaliable both in SI or IP units) or Psych
<http://wcec.ucdavis.edu/resources/software-resource-applications/>.

I've used one in Python too called CoolProp <http://www.coolprop.org/>
(also has other wrappers and interfaces in other languages)

Hope this helps
Julien

--
Julien Marrec, EBCP, BPI MFBA
Energy&Sustainability Engineer
T: +33 6 95 14 42 13

LinkedIn (en) : www.linkedin.com/in/julienmarrec
LinkedIn (fr) : www.linkedin.com/in/julienmarrec/fr
<http://www.linkedin.com/in/julienmarrec>

2015-02-09 22:02 GMT+01:00 Joe Huang <yjhuang at whiteboxtechnologies.com>:

>  Wet-bulb is not generally measured in weather stations, but can be
> derived from other measured climatic variables, such as dry-bulb
> temperature, dew-point temperature, and atmospheric pressure.
> Unfortunately, the derivation requires several equations and
> trial-and-error iteration (see Chapter 1 of the ASHRAE Handbook of
> Fundamentals).  If you don't relish writing a script or program to do this,
> you can look at the unpacked DOE-2 format (*.FMT or *.FMTM)  of the weather
> file, which does contain the calculated wet-bulb temperatures in the first
> data column (see attached sample snippet).  However,  you will need a
> utility Fortran program wthfmt2.f or wthfmt3.f  to convert the packed
> (*.BIN or *.BINM) DOE-2 file to a humanly -readable text  *.FMT or *.FMTM
> file.
>
> E-mail me for details.
>
> Joe
>
> Joe Huang
> White Box Technologies, Inc.
> 346 Rheem Blvd., Suite 205A
> Moraga CA 94556yjhuang at whiteboxtechnologies.comhttp://weather.whiteboxtechnologies.com for simulation-ready weather data
> (o) (925)388-0265
> (c) (510)928-2683
> "building energy simulations at your fingertips"
>
> On 2/9/2015 12:33 PM, RobertWichert wrote:
>
> These weather files are great, thanks for the info, but I am trying to get
> wet bulb temperature too, and they do not seem to give wet bulb
> temperatures.
>
> Any ideas on that, perhaps?
>
>
> --
> Robert P. Wichert P.Eng.  LEED AP
> CEPE  CEA  HERS I/II BPI BA+1 916 966 9060
> FAX +1 916 966 9068
>
>
>
> ========================================
> On 1/30/2015 9:10 PM, Joe Huang wrote:
>
> White Box Technologies (WBT), in collaboration with the National Renewable
> Energy Laboratory (NREL), has revised the TMY3 weather files to correct
> inconsistencies in units for illuminances, improve the reporting of Liquid
> Precipitation, replace all missing records with interpolated or filled
> values (chiefly for visibility, ceiling height, aerosol optical depth, and
> albedo), and add a new variable for Present Weather.
>
> Since their release in 2005, the TMY3 weather files covering 1,020
> locations in the US and dependencies has become the standard set of weather
> files for use in computer simulations of solar energy conversion systems
> and buildings. The intent of this revision is not to redo the fundamental
> analysis, but correct some known errors and make modest improvements in the
> reporting of subsidiary climate variables.
>
> The only impact from these corrections and changes are for daylighting
> simulations that use the illuminance values, and for building simulations
> that use the liquid precipitation to model green roofs or moisture
> transport through the building envelope. The added Present Weather variable
> is not directly used in any simulation program, but allows the DOE-2 BINM
> files to have correct IRAIN and ISNOW flags, although these two variables
> are not being used in DOE-2.  Filling in missing data for Visibility,
> Ceiling Height, etc., should have no impact on the use of the TMY3s, but
> improves their overall record-keeping.
>
> The revised TMY3 files in their native CSV format have been provided back
> to NREL and are available here:
> http://rredc.nrel.gov/solar/old_data/nsrdb/1991-2005/tmy3
>
> The revised TMY3 files in EPW and BINM formats are available for free
> download on the White Box Technologies web site at
> http://weather.whiteboxtechnologies.com/wd-TMY3 or by selecting File Type
> as "TMY3" at http:/weather.whiteboxtechnologies.com/search to search
> using GoogleEarth. The zip file names are unchanged, but the underlying EPW
> and DDY files will have the *TYA designation to distinguish them from the
> previous TMY3 versions.
>
> For a more detailed description and full documentation of the revision,
> please see the attached memorandum.
>
> Joe
> --
> Joe Huang
> White Box Technologies, Inc.
> 346 Rheem Blvd., Suite 205A
> Moraga CA 94556
> yjhuang at whiteboxtechnologies.com
> http://weather.whiteboxtechnologies.com for simulation-ready weather data
> (o) (925)388-0265
> (c) (510)928-2683
> "building energy simulations at your fingertips"
>
>
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