[Equest-users] [Bldg-sim] Creating a TMY weather file..

Aulbach, John jaulbach at nexant.com
Tue May 6 11:34:01 PDT 2008

Thanks Steve:

The US National Oceanic and Atmospheric Administration (NOAA) can give us years of weather data, but apparently with Dry Bulb and Dew Point.  That's why I am trying to use these, without another 8,760 calculations to get Wet Bulb..


-----Original Message-----
From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Steve Mignogna
Sent: Tuesday, May 06, 2008 11:18 AM
To: equest-users at lists.onebuilding.org; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] [Equest-users] Creating a TMY weather file..


I am not certain but I do not think DOE2 can generate the values for you.  Again not certain, but I think the minimum inputs are:

-Dry bulb Temperature (°F)
-Wet bulb Temperature (°F)
-Atmospheric Pressure (inches of Hg times 100) -Wind Speed (knots) -Wind Direction (compass points 0-15, with 0 being north, 1 NNE, etc.) -Cloud Amount (0 - 10, with 0 clear and 10 totally cloudy) -Cloud Type (0, 1, or 2)
     0 is cirrus or cirrostratus, the least opaque;
     1 is stratus or stratus fractus, the most opaque; and
     2 is all other cloud types, of medium opacity -Humidity Ratio (pounds of water per pound of dry air) -Density of Air (lb/ft3) -Specific Enthalpy (Btu/lb) -Rain Flag (0 means it is not raining; 1 means it is) -Snow Flag (0 means it is not snowing; 1 means it is)

DOE2 does not require solar variables but they will provide more accurate results.


On Tue, May 6, 2008 at 2:05 PM, Aulbach, John <jaulbach at nexant.com> wrote:
> Folks:
> Please refresh my memory. DOE-2 (thus eQuest) requires for weather, at 
> a
> minimum:
> 1) Dry Bulb Temp
> 2) Wet Bulb Temp
> 3) Wind direction
> 4) Wind Speed
> 5) Cloud cover
> World geometry develops the sun angle and insolation values (as I recall).
> The modeler takes an existing locale close to where you need the 
> weather, takes an actual year of as much of the above 5 categories as 
> one can, and inlays the actual year info over the TMY year (make sure 
> to call the new file something else !!).
> If I leave the Wet Bulb column blank and add Dew Point temperature 
> instead, is DOE-2 smart enough to generate Wet Bulb from the Dry 
> Bulb/Dew Point numbers ??
> Thanks.
> John R. Aulbach, PE, CEM
> Project Manager
> Nexant, Inc.
> 701 West Kimberly Ave., Suite 245
> Placentia, CA 92870-6342 USA
> Phone: 714-524-4402
> Fax: 714-524-4407
> email: jaulbach at nexant.com
> _______________________________________________
>  Equest-users mailing list
> http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org
>  To unsubscribe from this mailing list send  a blank message to 

Steve Mignogna
Atelier Ten
Bldg-sim mailing list
To unsubscribe from this mailing list send  a blank message to BLDG-SIM-UNSUBSCRIBE at ONEBUILDING.ORG

More information about the Equest-users mailing list