A mixed air duct, often part of an air mixing box HVAC system, is a component of your heating, ventilation, and air conditioning system that mixes incoming fresh air with recirculated indoor air. This mixing is vital for maintaining good indoor air quality and ensuring a comfortable environment.
Understanding the Function of a Mixed Air Duct
The primary function of a mixed air duct is to blend outside air with recirculated air before it's distributed throughout a building. This process addresses several key aspects of HVAC system performance:
- Indoor Air Quality (IAQ): By introducing fresh outside air, the mixed air duct helps dilute indoor pollutants and maintain healthy air quality.
- Temperature Control: Mixing warm recirculated air with cooler outside air (or vice-versa) helps to achieve a desired supply air temperature, reducing the load on the heating or cooling equipment.
- Energy Efficiency: Utilizing recirculated air can reduce the amount of energy needed to heat or cool the air, leading to energy savings.
Key Components and Operation
A typical mixed air system includes:
- Outside Air Damper: Controls the amount of fresh air entering the system.
- Return Air Damper: Controls the amount of recirculated air entering the system.
- Mixing Chamber: The space where the outside air and return air are blended.
- Sensors and Controls: These monitor temperature and air quality, adjusting the dampers to maintain optimal conditions.
Benefits of Using Mixed Air Systems
- Improved Indoor Air Quality
- Enhanced Temperature Control
- Increased Energy Efficiency
- Compliance with Ventilation Standards
