Janotkova E., Pavelek M.
Year:
2006
Bibliographic info:
The International Journal of Ventilation, Vol. 4 N°4, March 2006, pp 311-322

The basis for room air distribution solutions in ventilating and air conditioning rooms is the calculation of velocities in air jets from supply outlets. To calculate velocities, the C-value of the air outlets must be known. The aim of this contribution is to acquaint readers with a non-traditional method for defining the C-value of an outlet from the angle of air jet expansion in the main jet zone, determined using interferometric visualization of the jet. The principles of interferometric measurements in transparent environments are demonstrated, along with their evaluation via special software developed for evaluating recorded interferograms. 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.