1.) Fresh air demand
At the beginning we have to know how much fresh air is required. This depends on different conditions:
In business rooms the air need depends on the quantity of the people that work in that room and the work that they do, or the size and use of the room. An office work place for example should have a fresh airing of 50 m³/h.
Out of those asumptions leads the complete air volume need for the room or building. This figure is used to choose the heat exchanger or the airing unit. It also is a figure for the choice of the ventilators.
2.) System components
Now the components have to be selected that should be part of the system:
3.) Planning of the piping
Now follows the calculation of the complete resistance of the system. This figure is needed to choose the right ventilators or to check if the integrated ventilators are sufficient. It is the sum of all single resistances:
4.) Choice of the ventilators
With the system resistance and the air need the ventilators can be choosen. If an airing unit is to be installed the system characteristic is compared with the characteristic of the air unit to check if the pressure of the ventilators is high enough to deliver the demanded air volume into the rooms.
The noise emission can also be a criteria to choose a special ventilator.
5.) Parts list
As a result there is a list of all components that are integrated in the planned ventilation system. This parts list is the basis for the price offers.