Fundamentals of mechanical ventilation
Mechanical ventilation is one of the systems that keeps a habitable environment.
Purpose of mechanical ventilation:
- To heat or cool the incoming air
- To circulate/move the air in a room
- To supply/exhaust the required air amount in the room
Basic information about mechanical ventilation:
- Ventilation is operable independent on exterior conditions
- Requires precise operation control
- Provides temperature and humidity (and other sources) control
Mechanical ventilation is based on pressure difference and caused by dynamic pressure of a mechanical device - fan/blower.
Ventilation consists of 3 main parts:
- Ventilation rate – the amount and quality of the outdoor air
- Airflow direction – the flow of air within a building, from “clean” to “dirty” areas
- Air distribution – the delivery of outside air and removal of pollutants
Basic principles of mechanical ventilation:
- Overpressure ventilation
- Balanced ventilation
- Underpressure ventilation
Mechanical ventilation consists of several parts, i.e. air handling unit (AHU), ducts, air supply/exhaust devices, dampers, fan coils, heating/cooling unit, etc.