Charles,
Both are based on the equations that are laid out in Duffie and
Beckman's Solar Engineering of Thermal Processes. Type15
performs the computation in a subroutine called GetIncidentRadiation
(look at lines 3517 to 3539 of Type15.f90.) Type109 calculates it in a
subroutine called suncalc (lines 2435 to 2437 of Type109.f90). When we
were developing Trnsys17, we did note a number of discrepancies about
the way that Type109 was operating at timesteps other than 1 hour. You
might run your comparison at a 1 hour time step and see if the problem
goes away.
Best,
David
On 7/15/2010 02:11, LAUNAY Charles 226591 wrote:
Dear all,
I would like to know how types
15 and 109 compute the solar zenith
angle. I can’t find this information in the manual.
I’m using TRNSYS 16.
Thanks for your help.
Charles LAUNAY
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