The work describes the results obtained following the development and testing of a new device used to measure ventilation efficiency for indoor air quality (IAQ) in office buildings. The method uses concentration data obtained by the repeated injection of CO$/sb2$, used as a tracer gas simulating human respiration. The device measures the efficiency of the ventilation in reducing and evacuating pollutants. Ventilation efficiency was measured in a test chamber and was demonstrated in an office building. The method was tested to determine if it responded well to the effect of air flows, air velocities, air temperatures, number of diffusers and room temperatures. Results compared well with the theoretical predictions obtained from a two-chamber compartment model and could be predicted using simple regression models (r = 0.85). The work concludes that the new method can be used to measure ventilation efficiency and a chart is proposed for using the method with respect to recommended outdoor air flow rates in an office.

• experiments and testing
• tracer gas method for measuring air exchange
• ventilation: infiltration of buildings
• ventilation: measurement

1. Experimental Comparison of Three Heating Systems with Respect to Heat Distribution and Thermal Comfort