How can we determined air flow when we use wind speed

[quang nguyen]

Hi All Contam members.

As picture When I use opening on wall with wind speed only.

How can i determined air flow in and out through opening.

Please help with many thanks.

[Dols, William Stuart (Fed)]

Your image shows ContamW in the Wind Pressure Mode which displays wind pressures for one of three sets of data:

1.  User Set: defined by values on the Wind Pressure Display tab of the Weather and Wind Parameters
2. Weather File: defined by values in the WTH file as set via the Weather tab of the Simulation Parameters
3. WPC: defined by values in a WPC file

All are explained in detail in the User Guide.

The Wind Pressure Mode is provided to enable you to ensure you have defined azimuth angles according to your requirements.

You need to run a simulation to calculate the airflow rates.

Simulations utilize one of three data sets:

1. Steady State Weather Data
2. Transient Weather Data: WTH file
3. WPC Data: WPC file

Weather for simulations are defined via the Simulation Parameters dialog box.

 

Please review the Introduction to CONTAM video tutorials for details (not including the use of WPC files which is a fairly advanced topic).
https://www.nist.gov/el/energy-and-environment-division-73200/nist-multizone-modeling/software/contam/tutorials

 

- Stuart

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[quang nguyen]

Thanks Mr Fed very much. I can do it to find air flow rate.

Now, can we have to find the velocity or not?

Best regards,

Vào lúc 20:43:40 UTC+7 ngày Thứ Năm, 2 tháng 11, 2023, Dols, William Stuart (Fed) đã viết:

[William Dols]

ContamW does not provide the velocity through airflow paths, because not all airflow elements have a cross-sectional area term associated with them.
If your airflow path has an area component, then you can determine the average velocity.

You can even use Controls in ContamW to calculate it and output it to the <PRJ file name>.LOG file as shown here:

ContamW does provide average flow velocity in duct flow segments with which a cross-sectional area is associated.
- Stuart

[quang nguyen]

Thank you Fed,

Can you have sample or file Contam for me to reference.

Vào lúc 21:37:42 UTC+7 ngày Thứ Sáu, 3 tháng 11, 2023, William Dols đã viết:

[Dols, William Stuart (Fed)]

Example attached.

 

- Stuart

 

From: quang nguyen <quang.n...@gmail.com>
Sent: Saturday, November 4, 2023 1:10 PM
To: CONTAM <con...@list.nist.gov>
Cc: Dols, William Stuart (Fed) <willia...@nist.gov>; quang.n...@gmail.com <quang.n...@gmail.com>
Subject: Re: [contam] How can we determined air flow when we use wind speed

 

Thank you Fed,

 

Can you have sample or file Contam for me to reference.

 

 

Vào lúc 21:37:42 UTC+7 ngày Thứ Sáu, 3 tháng 11, 2023, William Dols đã viết:

ContamW does not provide the velocity through airflow paths, because not all airflow elements have a cross-sectional area term associated with them.
If your airflow path has an area component, then you can determine the average velocity.

You can even use Controls in ContamW to calculate it and output it to the <PRJ file name>.LOG file as shown here:

ContamW does provide average flow velocity in duct flow segments with which a cross-sectional area is associated.
- Stuart

 

On Thursday, November 2, 2023 at 9:35:07 PM UTC-4 quang.n...@gmail.com wrote:

Thanks Mr Fed very much. I can do it to find air flow rate.

 

Now, can we have to find the velocity or not?

 

Best regards,

[quang nguyen]

Thanks Stuart very much.

I will study on this file.

Best regards,

Vào lúc 22:21:57 UTC+7 ngày Thứ Hai, 6 tháng 11, 2023, Dols, William Stuart (Fed) đã viết: