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Comparative Analysis of the Methods for Measuring the Air Velocity and Flow in Mechanical Ventilation Systems

Mariusz Skwarczyński, 2014
Bibliographic info: International Workshop: Quality of Methods for Measuring Ventilation and Air Infiltration in Buildings | Brussels, Belgium 18-19 March 2014
Languages: English

The purpose of ventilation system is to provide and remove the airflow from room in accordance with its design. Unfortunately, in practice, this basic task is very often not fulfilled, which is frequently caused by negative handling by the users of the building. The most common reason for improper operation of the mechanical ventilation system is its insufficient output in particular sections of the system. There may be a number of reasons for that: wrong calculation at the stage of designing, disregarding or bad choice of working parameters of devices used in the system or significant changes at the stage of execution works. 

In case when the network is already malfunctioning or only being activated, the need to carry out measurements of output appears at a certain point. A significant parameter that should be assessed is the velocity and the amount of the air flow. Generally, such parameters are measured directly in ducts or near the air supply terminals (ATDs) or air exhaust grills. The aim of this paper is to compare  available methods for measuring the size of the airflow supply in regard to the accuracy of the measurement and the analysis of the measurement results.  

For the purpose of conducting the necessary measurement in the Laboratory of Air Conditioning and Ventilation of the Faculty of Environmental Engineering at the Lublin University of Technology a specially designed measurement stand was created. It is equipped with air handling unit, the network of ducts distributing the air to the ATDs as well as the measurement elements assembled directly on the ventilation ducts. 

The measurements were conducted by the four air supply grills. Traditional instrumentations such as, thermo-anemometers, pitot-tubes were compare with blades, IRIS damper, and ?? air flow cones. On the basis of the results, the most appropriate measurement methods for different types of air inlet vents or different size of airflow supply were defined.      

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