Re: [TRNSYS-users] Type 687 Calculation of QSbeam

[David Bradley <bradley@tess-inc.com>]

Title: Type 687 Calculation of QSbeam

Leanne,
  Thanks for finding that bug - the documentation in this case is correct - the code (and thus the DLL) uses an incorrect equation. I will send you a replacement DLL in a separate email.
Kind regards,
 David


Robinson, Leanne wrote:

Hello,
I am calculating illuminance through a window and would like to use the luminous efficacy model included in type687 NFRC window.

I was looking at the proforma and noticed that the calculation of Qsbeam does not match the equation given in the documentation for type687

In the proforma: QSBeam= Area*NUNITS*SHGC*IBEAM*COS(THETA*RDCONV)**0.2
In the documentation for the type the equation uses sqrt (cos theta).

I'm just making sure that this is only a discrepancy in the proforma and that the dll uses the correct term. 

Thank you,
Leanne Robinson

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