Balancing ventilation systems using thermography.

It has been shown that thermal imaging can give an indication of air flow rates through small cracks. Using a finite difference analysis package it is possible to determine the surface temperature of an air transfer grille when subjected to airflow rates at higher temperatures than the grille surface. This paper will address this technique by presenting the results of the finite difference analysis package for a specific grille. It will then present the results of a series of experiments to calibrate a range of air transfer grilles using thermal imaging,and finally will demonstrate how the technique can be applied tochecking the air flow rates in a ventilation system.