Adequate indoor air quality is becoming increasingly important today due to the better
airtightness of buildings. Simultaneously, we are more aware of the effects of indoor
environment on people's health, productivity and general well-being. As a result, in recent
decades there has been a rapid development of mechanical ventilation systems that allow
both indoor air exchange and regulation of temperature and humidity. Because of high
energy consumption of mechanical ventilation, natural ventilation becomes a great
alternative when striving for better energy efficiency. However, due to the unpredictability
and impact of the external environment, determining the efficiency of natural ventilation is
difficult. One of the more established methods is the use of tracer gas, with which we
measure natural air currents without interfering with the flow pattern itself. The purpose of
this thesis is to review and compare methods based on the use of tracer gas and to
determine their accuracy and suitability for practical implementation.
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