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Re: [EnergyPlus_Support] cp values input
The model uses linear interpolation to calculate CP values. The difference
of wind direction between #i and #i+1 is a denominator in the linear
interpolation. When the two values are the same, "divided zero" occurs. That
is why two repeated values of wind direction used in the
AIRFLOWNETWORK:MULTIZONE:WIND PRESSURE COEFFICIENT ARRAY object are not
allowed.
Lixing
----- Original Message -----
From: "neslihanturkmenoglu" <neslihanturkmenoglu@xxxxxxxxx>
To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Sent: Wednesday, March 12, 2008 11:16 AM
Subject: [EnergyPlus_Support] cp values input
>
> Hi Lixing
> I used my own cp values as input which acted on front an back
> surfaces with a wind direction of 180. Program didn't accept
> repeated values or one aveage value so I wrote the angles with 30
> range. Now I get no errors but I have no idea about what I did. Can
> You explain how it works.
> Thank you very much.
>
>
> !- =========== ALL OBJECTS IN CLASS: AIRFLOWNETWORK:MULTIZONE:WIND
> PRESSURE COEFFICIENT ARRAY ===========
>
> AIRFLOWNETWORK:MULTIZONE:WIND PRESSURE COEFFICIENT ARRAY,
> nesli basinc, !- WPC Array Name
> 10.0, !- Reference Height for WPC Data {m}
> 0, !- Wind Direction #1 {deg}
> 30, !- Wind Direction #2 {deg}
> 60, !- Wind Direction #3 {deg}
> 90, !- Wind Direction #4 {deg}
> 120, !- Wind Direction #5 {deg}
> 150, !- Wind Direction #6 {deg}
> 180, !- Wind Direction #7 {deg}
> 210; !- Wind Direction #8 {deg}
>
>
> !- =========== ALL OBJECTS IN CLASS: AIRFLOWNETWORK:MULTIZONE:WIND
> PRESSURE COEFFICIENT VALUES ===========
>
> AIRFLOWNETWORK:MULTIZONE:WIND PRESSURE COEFFICIENT VALUES,
> nesli basinc, !- AirflowNetwork WPC Array Name
> front node , !- External Node Name
> 1.019, !- WPC Value #1 {dimensionless}
> 0.974, !- WPC Value #2 {dimensionless}
> 1.056, !- WPC Value #3 {dimensionless}
> 0.983, !- WPC Value #4 {dimensionless}
> 0.919, !- WPC Value #5 {dimensionless}
> 0.753, !- WPC Value #6 {dimensionless}
> 0.694, !- WPC Value #7 {dimensionless}
> 0.563; !- WPC Value #8 {dimensionless}
>
> AIRFLOWNETWORK:MULTIZONE:WIND PRESSURE COEFFICIENT VALUES,
> nesli basinc, !- AirflowNetwork WPC Array Name
> back node, !- External Node Name
> -.662, !- WPC Value #1 {dimensionless}
> -.713, !- WPC Value #2 {dimensionless}
> -.759, !- WPC Value #3 {dimensionless}
> -.673, !- WPC Value #4 {dimensionless}
> -.725, !- WPC Value #5 {dimensionless}
> -.674, !- WPC Value #6 {dimensionless}
> -.701, !- WPC Value #7 {dimensionless}
> -.639; !- WPC Value #8 {dimensionless}
>
>
>
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>
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>
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>
>
>
>
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