[Bldg-sim] Creating a weather file

CleanTech Analytics jeremiah at cleantechanalytics.com
Wed Sep 12 08:48:19 PDT 2012


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>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]
> Sent: Wednesday, September 12, 2012 8:28 AM
> To: Herrmann, Lesley; bldg-sim at lists.onebuilding.org;
> 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 / +58.424.9701025 / +58.416.5861057
>
> 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
> >
> > http://www.nrel.gov/buildings/
> >
> >
> >
> > -----Original Message-----
> > From: 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
> > 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 / +58.424.9701025 / +58.416.5861057
> >
> > "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
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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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