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RE: [EnergyPlus_Support] AFN width & height factor / detailed opening
Tobias:
There are two issues. The first issue is window opening factor. If the
opening factor for Cases 1 and 2 are 1.0, both windows should get the same
flow rate due to the same geometry. Since the input files are not attached,
you may check the opening factor by yourself first.
The second issue is flow rate comparison. Since a two way flow is expected,
what flow rate do you compare, incoming flow, outgoing flow or a sum?
Please let me know what happens after check. You may also send your input
files and provide weather date file name if the weather file is available in
the web site. Then you need to specify which part of output file (rows and
columns) make you think a program code fault.
Thanks.
Lixing
-----Original Message-----
From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of tobiasschulzeoooitu
Sent: Monday, June 06, 2011 12:09 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [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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