Hello,
I was just taking a closer look at the heat transfer equations in SAM's
empirical trough model.
I noticed that the equations mentioned in the documentation
are slightly different than the ones
mentioned in
Heat Loss Testing of Schott's 2008 PTR70 Parabolic Trough Receiver
F. Burkholder and C. Kutscher
www.nrel.gov/docs/fy09osti/45633.pdf
or in the old FORTRAN code
sam_trough_model_type805.f90
e.g. in the SAM documentation the code is
QHCEHLD(4,n) = FHLA3 * ((T_out^2 + T_in^2) * (T_out + T_in)) / 4
In the paper mentioned above and in the FORTRAN code it is
HLTerm4 = (HCE_A3(n)/4)*(SFTo**4-SFTi**4)
Maybe this is just copy/paste error...
Kind regards,
Joe
