An adequate supply of fresh air is a necessary condition for life. If a person does not have a supply of air at all, after a few minutes, then loses consciousness and dies. This fact is everyone aware of, but do all people realize all the consequences of long-term breathing poor quality air? Stale air causes fatigue and drowsiness, which naturally reduces their efficiency and ability to concentrate. Yet most people in the environment where there is such air, spend most of their time. Children are closed at schools for half a day, where the values of CO2 often move up in terms of risk, adults at work, where they mostly sit in enclosed offices with other colleagues. During the day, when we do not ventilate these rooms, there is a rapid deterioration of the air quality. At home people sometimes ventilate during the day, but at night – especially in winter – they close windows and wake up tired and with headache in the morning. And again because of the stale air.
A solution would be regular ventilation – once per hour open window for a while. During the day, if you do not forget, this can be fulfilled, but it is difficult at night. Then it is advisable to use a much simpler solution – a system of forced or combined direct ventilation.
Forced ventilation systems mostly operate on the basis of the time regulation, which means that the volume of the exchanged air is depending on time intervals. In this case, it may sometimes occur that the air is exchanged more intensively than it is required in the situation. It is minus of the controlled ventilation – the air is redryied and energies area wasted when the air is exchanged more frequently than necessary. But even this only minus is possible to solve by a more economical way of ventilation – ventilation controlled by a real need.
An interesting solution, which in our country is not so usual, is a ventilation system, which is controlled by a real need. You say what is meant by the “real need”? It is just the necessary amount of air which is needed to bring to the interior, depending on the actual requirements. Inside the ventilated space there are installed sensors that monitor the quality of the indoor air. Based on these figures, the ventilation system is controlled so that the interior is fed by the fresh air.
The idea of space ventilated without human intervention and, moreover, according to the real needs is more than attractive. So, what can such a ventilation system offer you?
Fresh air in the exterior contains about 78% nitrogen, 21% oxygen, 0.4% water vapour, carbon dioxide 0.04%, the rest is created by inert gases and other constituents. In the interior, thanks to the presence of people and other events increases the level of carbon dioxide. Therefore, the carbon dioxide is a good indicator in determining the quality of the indoor air – mainly because it takes into account the number of people.
In addition to the carbon dioxide levels in the room the air quality is also affected by the amount of bacteria, ammonia and other contaminants. That is why other types of sensors have been developed, which are designed for different types of areas and sources of air pollution. These are sensors VOC (volatile organic compounds), which are mainly used in kitchens and areas where technical processes are running. Another type of sensors are the sensors SMOKE – smoke detectors, which are broad-spectrum sensors, that among other things, can measure the concentration of hydrogen, which is an essential component of cigarette smoke. They are able to evaluate how much “smoky” are the rooms and according to this value they can again optimally ventilate.
According to experts, this ventilation system offers the potential for energy savings. This is ensured by the fact that compared to the ventilation system that operates on the basis of a time regulation, this type of ventilation is controlled according to the current need. Ventilation therefore runs only when you really need to ventilate, in addition to optimal performance given by the current level of air pollution.
Where can this ventilation system find its application? At the first we can mention administrative buildings, schools and other buildings where the number of people changes over time. However, is this type of ventilation suitable to a family house? The answer is clearly yes. When we do not live in a low-energy or a passive house, we are not usually used to the forced ventilation, but, for example, for a passive house the ventilation controlled by a real need is entirely an appropriate choice. The advantage is that in the case of ventilation with a recovery there is no risk of the useless drying of the building in winter.
In this case it is recommended to place the ventilation in more regular intervals for several minutes. In account must be taken the number of people in the room. It is also advisable to control the optimal temperature. All these parameters can the air quality sensors control for you. The portable sensor ZG106 is capable to monitor the temperature and CO2 concentration and in excess of the values set by the user to notify it by an audible or visual signal.