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

[David BRADLEY]

Brandon,

   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 
processor).

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

kind regards,

  David


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
>
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> TRNSYS-users at lists.onebuilding.org
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-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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