Incomplete epw information

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

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" <[email protected]<mailto:[email protected]>> 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

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 < [email protected]> 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" <[email protected]<mailto:[email protected]>> > 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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