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

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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