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Re: [EnergyPlus_Support] create EPW weather file
Dru's referring to the WeatherConverter auxiliary program.
However, I want to expand a little on the raw data that's needed to create a usable
weather file. In addition to being hourly, you need to make sure that you have at the
minimum some indication of the following four key climatic variables: temperature,
humidity, wind speed, and solar radiation. Wind direction is also important if you're
trying to study natural ventilation. Barometric pressure would be nice, but not
essential. Ideally, you should have two solar values - total global horizontal and direct
normal (beam) radiation - but you'll be lucky just to have the former (global
horizontal), since solar radiation is not something included in standard weather reports.
If you only have global horizontal,
the direct normal can be calculated by the WeatherConverter program, but make sure that
you use Version 8 or later, since there was a mistake in previous versions in this
calculation. If you don't have any solar radiation, you would then need information on
Cloud Cover, i.e., the amount of the sky covered by clouds, which WeatherConverter would
use to calculate the global horizontal, or otherwise you'll get a file always with clear
day radiation.
Joe
Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 108D
Moraga CA 94556
yjhuang@xxxxxxxxxxxxxxxxxxxxxxxx
http://weather.whiteboxtechnologies.com for simulation-ready weather data
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"
On 7/11/2014 10:32 AM, dru.crawley@xxxxxxxxxxx [EnergyPlus_Support] wrote:
> Information on hourly data needed for EnergyPlus is found in the auxiliary programs documentation. You will need at least hourly data.
> ----- Reply message -----
> From: "kharbouch.yassine87@xxxxxxxxx [EnergyPlus_Support]"<EnergyPlus_Support@xxxxxxxxxxxxxxx>
> To: "EnergyPlus_Support@xxxxxxxxxxxxxxx"<EnergyPlus_Support@xxxxxxxxxxxxxxx>
> Subject: [EnergyPlus_Support] create EPW weather file
> Date: Fri, Jul 11, 2014 12:27 PM
>
>
>
> Hi
>
> how i can create a EPW weather file from a weather database of a city.
>
> thanks
>
>
>
>
>
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Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx
The primary EnergyPlus web site is found at:
http://www.energyplus.gov
The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/
Attachments are currently allowed but be mindful that not everyone has a high speed connection. Limit attachments to small files.
EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
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