[TRNSYS-users] Type99 incidence angle for tracking mode 3

David BRADLEY d.bradley at tess-inc.com
Tue Aug 11 05:53:24 PDT 2020


   Type99 makes some assumptions about the nature of the data that 
you've got and at times you need access to certain additional parameters 
that it has built-in. I would recommend that instead of Type99, you use 
a combination of Type9 (data reader) and Type16 (solar radiation 

   As a side note, when using Type16 make sure that you set the "start 
day of simulation" parameter correctly.

kind regards,


On 08/10/2020 22:02, Brandon Hathaway via TRNSYS-users wrote:
> Hey all,
> I'm using the Type99 user defined data reader and radiation 
> processor and am receiving very unrealistic values of the incidence 
> angle.  I'm reading data for location in California at 119.98 W, 35.69 
> N, and have provided the header to the data file as shown below:
> image.png
> Here's how July 1st looks like in terms of the Incidence angle from 
> the Type99 (red line) and the Type15 (orange line) for nearby Fresno CA.
> image.png
> Doing the solar geometry calculations by hand, the Type15 is spot-on, 
> but clearly the Type99 isn't.  In both types I am specifying Tracking 
> Mode 3 and both the slope and azimuth of the surface is set as zero 
> for tracking along a N-S axis with no slope.
> Is there something I should be doing differently? Or is this an issue 
> within the Type99 source that needs editing?
> Thanks for your help!
> -Brandon
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at lists.onebuilding.org
> http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org

Thermal Energy Systems Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI  53703 USA

d.bradley at tess-inc.com


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