Mixed Air Calculator: Optimize HVAC Temperature & Airflow

Mixed Air Calculation Tool

Unlock precise HVAC system design with our Mixed Air Calculator. Accurately determine mixed air temperature, CFM, and the ideal proportions of return air and outside air. Essential for engineers, technicians, and anyone optimizing indoor air quality and energy efficiency in building HVAC systems. Simplify complex calculations instantly.

Formula:

The mixed air temperature is calculated as a weighted average based on the airflow volumes and temperatures of the outside and return air streams.

Formula for Mixed Air Temperature (Tmixed):

Tmixed = (CFMOA × TOA + CFMRA × TRA) / (CFMOA + CFMRA)

  • Tmixed: Mixed Air Temperature
  • CFMOA: Outside Airflow (Cubic Feet per Minute)
  • TOA: Outside Air Temperature
  • CFMRA: Return Airflow (Cubic Feet per Minute)
  • TRA: Return Air Temperature

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