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Abstract
In the previous paper, theoretical consideration of the tracer gas experimental method that uses dynamic steady state concentration was made. In this study, the feasibility of the tracer gas experimental method was examined based on a laboratory experiment. It was confirmed that a dynamic steady state concentration in case of negative generation of tracer gas corresponds to the age of air in an open-air system. The sum of dynamic steady state concentrations in case of positive generation of tracer gas and that for negative generation in the air recirculating part of a room is similar to the steady state concentration in an open air system.
Highlights
Tracer gas experimental methods have been widely used to evaluate the ventilation effectiveness or gaseous contaminant removal efficiency of a space
This type of ventilation system can switch between the open system, which takes in fresh outside air and exhausts indoor air to the outside, and the air recirculating system where supply and exhaust are coupled in the air recirculating section of room
In the air recirculating system, it was impossible to conduct a tracer gas experiment to generate a negative source in the air recirculating system
Summary
Tracer gas experimental methods have been widely used to evaluate the ventilation effectiveness or gaseous contaminant removal efficiency of a space. When tracer gas is supplied under non-ventilated conditions, the concentration rises endlessly, so no suitable experimental method has been established. Such a system without ventilation is called an air recirculating system. In the previous study[1], we proposed a theory that enables a tracer gas experiment on the air recirculating system by using the concept of the dynamic steady-state concentration established when supplying tracer gas. We applied the same theory to laboratory experiments and examined the possibility of tracer gas in the air recirculating system. We define the dynamic steady-state concentration as follows, each time-varying concentration constituting the steady concentration distribution
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