If the calculation of natural ventilation is performed correctly, you will get a well-ventilated comfortable room. And for the design of a high-quality and reliable system, it is very important to take everything correctly into account. Depending on how the calculation of ventilation is carried out, as well as on compliance with all standards, it is possible to provide the room with the necessary amount of air. And this will create the maximum comfort of living in the house, even if natural ventilation is poorly arranged.
What is ventilation calculation?
Every home needs quality ventilation. Its calculation is the determination of the operating parameters of all system elements. The correctness of such work will affect the efficiency of the entire system. The calculation process has its difficulties, and now we will consider what it is.
Where to begin?
The calculation of ventilation should always be started by indicating the required parameters. This is the purpose of the room, the number of people in it, the number of appliances that produce heat. If we add all these values together, we get the room’s air capacity. This indicator will help determine the air volume ratio - the number of times when the air in the room is completely replaced in one hour. For residential premises, the required air exchange rate is one, but working rooms will require 2-3. For all rooms in terms of air exchange, all values make up air capacity, the usual values of which are:
- offices - 1000-10000 m 3 / h;
- apartments - 1000-2000 m 3 / h;
- cottages - 100-800 m 3 / h.
We take the necessary measurements
You will also have to calculate the power of the heater. This takes into account the desired indoor temperature, as well as the lower temperature value of the air outside. In addition, when choosing equipment, consider the operating pressure created by the fan, the permissible noise level and the required air flow rate.
We design an air distribution network
Now you can proceed to the second stage - designing the air distribution network. It includes ducts, adapters, air distributors, etc. Of great importance in this case will be the diameters of the ducts and the number of transitions between different diameters. The more these indicators are, the greater will be the working pressure. For those who are not very well versed in this terminology, as well as in the features of the construction of ventilation systems, we give the formula. It will help to calculate the ventilation: the fan power in the apartment should be equal to the volume of the room, multiplied by two. Keep in mind that in the case of an office building, 60 cubic meters of fresh air should be allocated to one person in one hour.
We find the best solutions
The diameter of the duct determines the average air flow rate. It should usually be 12-16 mm / s. When designing a ventilation system, it is important to find the optimal ratio between noise level, fan power and duct diameters. When calculating the power of the air heater, take into account the desired temperature in the room, the lower level of the air temperature outside. For apartments, the average value of the power of the heater is in the range from 1 to 5 kW, and for offices the limits are from 5 to 50 kW.
As you can see, the calculation of ventilation is a complex process, and if you are not sure that you can cope with all its subtleties, it is better to contact specialists.