For normal activity of the person, fresh air is necessary therefore in all premises the ventilation system which has to be arranged according to present rules and regulations is provided.
Key parameters of ventilation system
At the organization of vent system in the apartment it is necessary to consider such parameters as volume of air and ventilation rate. According to rules, on one person who is constantly staying indoors not less than 30 mg/hour of fresh air are necessary. By means of indicator of frequency rate the amount of air which circulates indoors within hour pays off. If in the apartment the ventilation system badly works, then surplus of gases and harmful compounds will not be removed together with warm air.
This problem is relevant because modern double-glazed windows have high tightness that in rooms often there is no inflow of fresh air.
How to restore ventilation system
You should not close or delete old aspiration and ventilating ducts. It is enough to smooth out and restore system, normal air exchange in rooms will be so adjusted. For this purpose in channels install exhaust fans. But for creation of more effective ventilation system it will be required to calculate: - air pressure; - necessary amount of air; - air heater power; - size of air ducts;
Calculation of power of ventilation system
In acc«mmodation spaces for calculation of power of ventilation system it is necessary to know the required air consumption. Let's say room space is 30 sq.m, and height - 2.5-3 m. The volume of the room is equal to 150 CBM. At such size the double air exchange, that is 300 CBM/hour is required. The ventilation rate depends on assignment of the room and the number of the people who are in it. According to standards of Construction Norms and Regulations in premises it is possible to organize single, and at offices – triple air exchange. The following indicator – amount of air. This indicator can be calculated both on frequency rate, and by the number of people, and then to choose the greatest of them. For example, on frequency rate: L=n*S*H. In our case of H=3 m, S=50 sq.m, and n is standard indicator of frequency rate (1 for premises, and 2.5-for offices). Total: L=150 sq.m/hour. When all calculations are made, it is possible to pick up the fan of the necessary performance. At the same time it is necessary to consider quantity of pressure losses. For example, if air duct length more than 15 m, then pressure loss is not less than 100 Pas. Ventilation system power for apartments varies from 100 to 500 CBM, and for country houses from 1000 to 2000 cube/hour. In workplace where inflow of fresh air directly affects working capacity: from 1000 to 10000 cubic.