Regulation of the indoor air quality is a prerequisite not only for the well-being and high performance, but also for energy-optimized operation of ventilation equipments adjusting parameters of the internal air. According to professional researches the indoor air pollution in buildings is often even higher than the outside air pollution.
Building materials, furniture, burning gases for heating and cooking, smoking, cleaning agents.
The most effective method for maintaining the air quality at an acceptable level is the adequate ventilation. The problem is how to avoid wasting energy in unnecessary ventilation of buildings. The solution is the control of ventilation either in dependence on time or based on the measurement of air pollution.
CO2 sensors that measure primarily the content of carbon dioxide in the air, do not detect the current air pollution. Where may be other sources of air pollution, it is advisable to use sensors of air pollution that are sensitive to various gases polluting the air. In these cases, it is insufficient to control the ventilation only on the basis of values of CO2 concentration. Compared to the ventilation systems controlled only on the basis of time, ventilation systems controlled via the air quality sensor can meet the seemingly conflicting requirements for minimum energy consumption, and at the same time maintain a good while maintaining a good indoor air quality.
There are many synthetic and even natural chemicals called volatile organic mixture abbreviated VOC originally from the English expression (Volatile Organic Compounds). In the buildings there is a large number of sources of these chemicals, such as plastics, furniture, building materials, various chemical cleaners, polishes, cigarette smoke etc. Most of these chemicals cause irritation at sufficiently high concentrations.
Formaldehyde is a colourless gas with a pungent odour. The most common sources are particularly new housing materials. Carpets, furniture containing glues with formaldehyde. The slow release then causes degradation of the air quality. The concentration of formaldehyde in the air depends on the internal resources and their age, ambient temperature and humidity. Formaldehyde is a known irritant. Symptoms of an increased concentration of formaldehyde are headache, sore throat, fatigue, dizziness, difficult breathing and burning eyes, etc.