What is face velocity of louver?

velocity at the louvre face. This can be calculated using the following formula: Face Velocity (m/s) = Volume Flow Rate (m³/s) / Face Area (m²) For example: If the volume flow rate is 2m³/s and the face area is 1m² the face velocity will be 2m/s.

How is louver calculated?

By subtracting any obstructions to airflow (frames and blades) from the overall opening size we get a net result – free area. The typical size for grille/louver comparison is 48″ Wide x 48″ High – which is an industry standard. Never assume that sizes other than this will have the same percentage free area.

What is grille face velocity?

Face velocity is the measured air speed at an inlet or outlet of a heating ventilation and air conditioning (HVAC) system.

How do you calculate CFM for a louver?

We can now determine how much air can safely be run through the louver by multiplying the louver free area by the design velocity ( 7.2 sq ft x 893 fpm). The resulting Volume of Air for Louver 1 is 6424 cfm.

What is the face area of a Louvre?

1. The EN 13030 tests use a louvre sample with a 1m x 1m face area.

How do you calculate louver pressure drop?

Or alternatively, using your trusty calculator, you can follow the instructions below to work everything out manually.

1. 1 – Starting Formula.
2. 2 – Input Figures.
3. 3 – Multiply Discharge Loss & Area.
4. 4 – Divide Volumetric Flow.
5. Multiply Remaining Figures.
6. 6 – Pressure Drop Result.

How does a louvre work?

How do louvres work? Depending on the type of ventilation you need, a selection of specially designed blades are mounted in a frame. Each blade and blade configuration is different and allows different things to pass through it or over it. For example, blades may allow air through, but not rain or sand.

What is face velocity of filter?

Filter face velocities are typically calculated based on the diameter of the sample on the filter and the volumetric flow rate through the filter. 1–3 Such face velocities are an accurate representation when the sample is distributed evenly across the filter surface, such as on quartz and nylon filters.

How do you calculate free area of ventilation?

The “Free area” of an opening is a way of describing how well air can travel through for the purposes of natural ventilation….In the example above:

1. Floor area = 20m2.
2. Total window free area = 2 windows @0.6m2 each = 1.2m2.
3. Free Area for room = 1.2m2 / 20m2 = 6%