Calculate Pressure Drop of Air Across an Opening

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Discussion Overview

The discussion revolves around determining the pressure drop of air across an opening, specifically focusing on a louvred roller door used in a car park. Participants explore the calculations involved based on airflow rates and opening characteristics.

Discussion Character

  • Technical explanation
  • Exploratory

Main Points Raised

  • One participant seeks to calculate the pressure drop for air flowing through an opening with specified airflow rates and dimensions.
  • Another participant suggests that the characteristics of the opening, such as whether it is a louver, will influence the pressure drop.
  • A later reply clarifies that the opening is a louvred roller door, which may have specific performance characteristics.
  • Further inquiry is made about whether the door is pre-manufactured and if its characteristics can be referenced for calculations.
  • The original poster provides additional details about the dimensions of the openings in the roller door, describing them as small and rectangular.

Areas of Agreement / Disagreement

Participants have not reached a consensus on how to calculate the pressure drop, and multiple views regarding the characteristics of the opening and their impact on the calculations remain. The discussion is still unresolved.

Contextual Notes

Limitations include the lack of specific characteristics or performance data for the louvred roller door, which may affect the accuracy of pressure drop calculations. There are also unresolved questions regarding the testing or referencing of the door's characteristics.

Futsal1st
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How do I determine the pressure drop of air across an opening? For example if I have 3,000 L/s (3 m3/s) and an opening of 8.4 m2 I know the velocity is 0.4 m/s. If the free area is 80%, the velocity increases to 0.45 m/s. What I'd like to cal is the pressure drop in each case.

Cheers
 
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It would depend on the characteristics of the opening. Is it a louver of some sort? Can you test it?
 
Its a louvred roller door.
 
Is it pre-manufactured? Can you look up its characteristics? And you didn't answer my other question...
 
Sorry 'bout that.

Its a car park roller door that has small openings (almost rectangular)about 5mm high and 50mm long. It acts like a perforated panel between the outdoor and the car park.
 

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