Determination of air outlet C values by means of interferometry

článek v časopise - ostatní, Jost

angličtina

The basis for room air distribution solutions in ventilating and air conditioning rooms is the calcula-tion of velocities in air jets from supply outlets. To calculate velocities, the C-value of the air outlets must be known. The outlet C-values are specified for each type of outlet experimentally. The aim of this contribution is to acquaint readers with nontraditional methods for defining the C-value of an outlet from the angle of air jet expansion in the main jet zone, determined using interferometric visu-alization of the jet. To visualize the air jet from the outlet, a Mach-Zehnder interferometer is used which allows accurate, quality interferometric records to be obtained over the entire field of view of the jet. This contribution describes the dependence of the outlet C-value on the expansion angle of the main jet zone. The principles of interferometric measurements in transparent environments are dem-onstrated, along with their evaluation via special software developed for evaluating recorded inter-ferograms. The C-value of slot and rectangular outlets is determined using the method introduced here. Results demonstrate the high precision of the method, and that the C-values of outlets can be defined effectively from the visualization records.

Air jets, velocity, supply air outlets, C-values, interferometry

JANOTKOVÁ, E.; PAVELEK, M.

2006

1. 3. 2006

VEETECH Ltd.

1473-3315

The international journal of ventilation

4

4

Spojené království Velké Británie a Severního Irska

311

322

12