Re: [TRNSYS-users] Error in Beam radiation calculation

[David Bradley <bradley@tess-inc.com>]

Siamak,
  The algorithms for getting hourly solar from a single monthly number can sometimes give you this error, particularly at the hours when the sun is rising and setting. Getting the error at 400 timesteps during the year is not a guarantee that there is anything wrong but it is more frequent than normal. The two most common errors are in setting two of the parameters for Type16. Make sure that you have the Type16 parameter for the day of the simulation start correct and make sure that you have your shift between solar and local times correct. The shift should be specified for the weather data location, not for the actual solar collector location (if those two are different).
Kind regards,
 David


siamak khorrami wrote:

Dear Friends,

I have simulated the calculation of solar radiation by type54c (weather Generator: Default Random Number Seeds) and type16i (Solar Radiation Processor: Total Horizontal and Diffuse Horizontal Known) and connected the outputs of them to  the collector. when I run the simulation I face these errors:

"The calculated value of the beam radiation exceeded the maximum possible beam radiation from this step. The beam radiation has been set to the extraterrestrial radiation for this time step"
 
and




"The beam radiation exceeded the extraterrestrial radiation for 400 time steps during the simulation "


Would someone  please guide me what I should do to avoid this problem?


Sincerely,
Siamak Khorrami

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