[Equest-users] [Bldg-sim] Creating a TMY weather file..
jaulbach at nexant.com
Tue May 6 11:34:01 PDT 2008
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..
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:
> Please refresh my memory. DOE-2 (thus eQuest) requires for weather, at
> 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 ??
> 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
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