[TRNSYS-users] Type 687 Calculation of QSbeam

[David Bradley]

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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>
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Thermal Energy System Specialists (TESS), LLC 
David BRADLEY                      22 N. Carroll Street - Suite 370 
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