[Radiance-general] Incomplete epw information

[Mostapha Sadeghipour]

Daniel,

You should be able to generate the .wea file from diffuse horizontal
radiation and direct normal radiation values. The structure of the lines
after the heading in .wea file is:

month day hour directNormalRadiation diffuseHorizontalRadiation

You can also check Daysim's source code if you have it installed on your
system. You should be able to find it at: "C:\DAYSIM\src\epw2wea\epw2wea.c"

Mostapha

On Tue, Apr 14, 2015 at 10:47 AM, Guglielmetti, Robert <
Robert.Guglielmetti at nrel.gov> wrote:

> I would recommend running a regular epw file through the utility
> "epw2wea", which takes a weather file from the EnergyPlus database and
> converts it for use with gendaymtx. This way you can see exactly which
> subset of information gendaymtx needs, and in what format. It's basically
> the Daysim weather input format (and it's less info than what you have in
> your custom weather file there). Your file format is not what gendaymtx
> expects, and is probably the cause of your troubles.
>
> On 4/14/15, 8:39 AM, "Daniel Uribe" <dnuribe at uc.cl<mailto:dnuribe at uc.cl>>
> wrote:
>
> Dear:
>
> I have the following problem with the Radiance lighting simulation:
>
> I created a climate file from a weather station data. I have the following
> parameters:
>
> - Dry bulb temperature
> - Dew point temperature
> - Relative humidity
> - Atmospheric Pressure
> - Horizontal infrared radiation from sky
> - Global horizontal radiation
> - Direct normal radiation
> - Diffuse normal radiation
> - Visibility
>
> All other data assumed to be zero.
>
> With this weather file, simulation isn't done correctly, so if it happens
> if I use a weather file from EnergyPlus database.
>
> What data are required for the simulation, in order to complete my weather
> file?
>
> Regards.
>
>
> --
> Daniel Uribe Cáceres
> Estudiante de Ingeniería Civil
> Diploma en Ingeniería Estructural
> Pontificia Universidad Católica de Chile
>
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