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Hi all,
I’m modelling a parabolic trough collector field with Type99 (TRNSYS 18), tracking mode 3, horizontal N-S axis (slope 0, azimuth 0). I want to create a didital twin and confirm meassured data with the simulation.
The incidence angle was way off. The surface slope output stays near 90 deg all day and never goes back to 0. Changing the axis azimuth makes no difference at all. Maybe there is an error with "GetTiltedRadiation" because i think it interprets the the tilt of the collector surface as axis of my collector row. So in the first time step when the sun is raising my collector faces almos 90° east. So far thats correct, but in the next time step my axis of the collector becomes 90° which means that from now on the collector is rotating around a pole instead of the north sout axis. Also I tried type 109, which works fine but its an outdated type and has a known bug when the slope is 0. Next step is trying type 16 plus type 9.
best regards
Alex