[Bldg-sim] Creating a weather file

[Herrmann, Lesley]

Well said,  I agree, custom weather files should be used for calibration purposes.  I would also recommend weatheranalytics.com.

From: CleanTech Analytics [mailto:jeremiah at cleantechanalytics.com]
Sent: Wednesday, September 12, 2012 9:48 AM
To: Herrmann, Lesley
Cc: kalvarez at corpoelec.gob.ve; bldg-sim at lists.onebuilding.org; jim at buildingperformanceteam.com; Chuck Khuen
Subject: Re: [Bldg-sim] Creating a weather file

There is a problem with using weather underground weather data for simulation. All of the .bin or .epw weather data are Typical meteorological (TMY) year is averaged over time- so using them to predict the average year thermal energy use works reasonably well. Data from weather underground is actual meteorological year (AMY) this will produce a model of the year that the weather data was measured. The only time when AMY weather data should be used for modeling is when calibrating a model for an existing building. The calibration process is to use actual weather data to remove one variable and then to modify the model to align the loads and consumption to the designed and measured data from the building. Once the model has been calibrated with actual weather data, then the modeler changes back to typical weather data for predicting the average year. Never should one attempt to predict an typical year from actual year weather data. If you do not feel that the closest typical weather data to your location is sufficient than you should pay for a file to be created from  http://weatheranalytics.com/

Best regards
On Wed, Sep 12, 2012 at 8:20 AM, Herrmann, Lesley <Lesley.Herrmann at nrel.gov<mailto:Lesley.Herrmann at nrel.gov>> wrote:
Khristiam,

I guess it depends on how soon you need to run your model.  You can create a sub-yearly weather file (say, April 2012 - August 2012), but WeatherConverter will not interpolate or perform any kind of averaging techniques to complete the year.  You can run an EnergyPlus model with your sub-yearly weather file as long as you set the run period equal to the length of your weather file, or to a time period within your weather file, (say, the month of June for the example above).  I would think you could do the same in eQuest.

Hope this helps.

Lesley

-----Original Message-----
From: Khristiam Alvarez [mailto:kalvarez at corpoelec.gob.ve<mailto:kalvarez at corpoelec.gob.ve>]
Sent: Wednesday, September 12, 2012 8:28 AM
To: Herrmann, Lesley; bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>; jim at buildingperformanceteam.com<mailto:jim at buildingperformanceteam.com>
Subject: Re: [Bldg-sim] Creating a weather file

Dear Jim and Lesley

Thank you very much for your emails.

I will implement what you reccomend.

I use eQuest software made by DOE, which require *.bin files for weather data.

I used a file conversion software to convert *.epw to *.bin

Now, do I have to wait until april 2013 to get a full one year data from wunderground for the software to work? or can I use existing data?

Regards

--
Khristiam Alvarez
Ingeniero Mecánico

Proyecto Hidroeléctrico Tocoma, Módulo 4 Proyectos Mecánicos Estudios e Ingeniería de Expansión CORPOELEC Km. 85 Vía Guri, Mun. Angostura, Edo. Bolivar, VENEZUELA

Tlfs: 0286.965.3579 / 0424.9701025 / 0416.5861057 Para llamar desde fuera de Venezuela:
+58.286.9653579<tel:%2B58.286.9653579> / +58.424.9701025<tel:%2B58.424.9701025> / +58.416.5861057<tel:%2B58.416.5861057>

El 12/9/2012 09:09 a.m., Herrmann, Lesley escribió:
> Hi Khristiam,
>
> Once you have collected data from wunderground, you can create a custom weather file to run in EnergyPlus using the WeatherConverter executable (Weather.exe), which comes with the EnergyPlus download. To do so, enter your weather data into an excel spreadsheet and create a definition file using a text editor.  The definition file defines the columns in your spreadsheet, the associated units, time steps, etc, and must end in ".def".  The Weather.exe interface reads the .def file and converts the excel sheet into an epw file.  The executable will also create a .csv, .ddy (design day), and .stat file for you.  You can create the weather file with any time step you'd like (1 min, 5 min, 1 hour...).
>
> The EnergyPlus AuxilaryPrograms document provides more detail on this process and shows some examples.
>
> Are you running in eQuest of EnergyPlus?  Unfortunately I'm not familiar with the eQuest weather file format or how to convert E+ weather files to eQuest weather files, but maybe the csv output could help.
>
> Regards,
> Lesley
>
> __________________________________________
> Lesley Herrmann
> Commercial Buildings Engineer
> Center for Electricity, Resources, and Building Systems Integration
> National Renewable Energy Laboratory (NREL)
> 1617 Cole Blvd., Golden CO 80401
> 303.275.4318<tel:303.275.4318>
>
> http://www.nrel.gov/buildings/
>
>
>
> -----Original Message-----
> From: bldg-sim-bounces at lists.onebuilding.org<mailto:bldg-sim-bounces at lists.onebuilding.org>
> [mailto:bldg-sim-bounces at lists.onebuilding.org<mailto:bldg-sim-bounces at lists.onebuilding.org>] On Behalf Of Khristiam
> Alvarez
> Sent: Wednesday, September 12, 2012 6:41 AM
> To: bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>
> Subject: [Bldg-sim] Creating a weather file
>
> Hi there
>
> Have anyone experience in creating a new weather file from wunderground data?
>
> This is my case: I use the Caracas file download from the EnergyPlus site converted to eQuest format but I live in other hotter city, Puerto Ordaz that has a wunderground station working since last april.
>
> Thank you very much!
>
> --
> Khristiam Alvarez
> Ingeniero Mecánico
>
> Proyecto Hidroeléctrico Tocoma, Módulo 4 Proyectos Mecánicos Estudios
> e Ingeniería de Expansión CORPOELEC Km. 85 Vía Guri, Mun. Angostura,
> Edo. Bolivar, VENEZUELA
>
> Tlfs: 0286.965.3579 / 0424.9701025 / 0416.5861057 Para llamar desde fuera de Venezuela:
> +58.286.9653579<tel:%2B58.286.9653579> / +58.424.9701025<tel:%2B58.424.9701025> / +58.416.5861057<tel:%2B58.416.5861057>
>
> "Este contenido es confidencial y de interes exclusivo para el Ministerio del Poder Popular para la Energia Electrica (MPPEE) y sus entes adscritos, por lo tanto, se permite copiar o distribuir el mismo solo a personas autorizadas. Si recibe este correo por error, por favor destruyalo y notifique al remitente. Eventualmente, los correos pueden ser interceptados o alterados, llegar con demora o incompletos, al respecto el MPPEE y sus entes adscritos no se hacen responsables por los errores, defectos u omisiones que pudieran afectar al mensaje original."
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"Este contenido es confidencial y de interes exclusivo para el Ministerio del Poder Popular para la Energia Electrica (MPPEE) y sus entes adscritos, por lo tanto, se permite copiar o distribuir el mismo solo a personas autorizadas. Si recibe este correo por error, por favor destruyalo y notifique al remitente. Eventualmente, los correos pueden ser interceptados o alterados, llegar con demora o incompletos, al respecto el MPPEE y sus entes adscritos no se hacen responsables por los errores, defectos u omisiones que pudieran afectar al mensaje original."
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