Heating, Ventilation and Air Conditioning (HVAC for short) refers to the system or related equipment responsible for heating, ventilation and air conditioning in the room or in the car.
The design of HVAC system is applied to thermodynamics, fluid mechanics and fluid machinery, which is an important sub-discipline in the field of mechanical engineering.
Its purpose is to establish an indoor artificial environment that is beneficial to human survival.
The HVAC system can control the temperature and humidity of the air and improve indoor comfort. It is an important part of medium and large industrial buildings or office buildings (such as skyscrapers).