Heating, Ventilation and Air conditioning
HVAC systems are designed to maintain precise temperature, humidity and airflow control.
In order to maintain low energy use in the buildings, natural ventilation is always the first choice, however, mechanical ventilation is considered where occupancy and indoor air quality (IAQ) necessitates that it be used.
The ventilation flow rates and the recommended indoor air quality shall form the basis of approximating the size of the air handling units and the ductwork.
The air conditioning systems selection shall also premise on environmental requirements, flexibility, maintainability, energy consumption, durability, individual control, zoning, running costs, etc.