Publication detail

Determination of air outlet C values by means of interferometry

JANOTKOVÁ, E. PAVELEK, M.

Original Title

Determination of air outlet C values by means of interferometry

Type

journal article - other

Language

English

Original Abstract

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.

Keywords

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

Authors

JANOTKOVÁ, E.; PAVELEK, M.

RIV year

2006

Released

1. 3. 2006

Publisher

VEETECH Ltd.

ISBN

1473-3315

Periodical

The international journal of ventilation

Year of study

4

Number

4

State

United Kingdom of Great Britain and Northern Ireland

Pages from

311

Pages to

322

Pages count

12

BibTex

@article{BUT46678,
  author="Eva {Janotková} and Milan {Pavelek}",
  title="Determination of air outlet C values by means of interferometry",
  journal="The international journal of ventilation",
  year="2006",
  volume="4",
  number="4",
  pages="311--322",
  issn="1473-3315"
}