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[EnergyPlus_Support] AFN width & height factor / detailed opening



Hello,

after some parametric analysis I realized, that for a single sided ventilation strategy, the volume flow is same for these two options:
1) width factor = 0,1 & height factor = 1
2) height factor = 0,1 & width factor = 1

One can assume, that the volume flow in case 1) is higher because of the bidirectional opening model and higher density differences from top of the opening to the bottom of the opening as the opening height is bigger.

Therefore I repeated the same cases, but changing the window geometry according the previously mentioned factors (leaving the factors as 1). Here the resulting volume flow for 
3) opening width=0,1 & opening height=1
is much higher than with a 
4) opening height=0,1 & opening width=1

This is as I assumed and flow for case 3)is very close to 1) & 2)

Concluding, there may be is a program code fault with the opening factors when changing the height factor.

Unfortunately the analytic solution for the cases as it is described in the engineering reference is very difficult to realize but I can send the 3 idf test files.

Best Regards,
Tobias



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