Mixed Air Temperature Calculator

Compute resulting temperature after mixing two air streams.

Mass flow 1 (m₁) in kg/s

Temperature 1 (T₁) in °C

Specific heat 1 (Cp₁) in kJ/kg·K

Mass flow 2 (m₂) in kg/s

Temperature 2 (T₂) in °C

Specific heat 2 (Cp₂) in kJ/kg·K

How to Use This Calculator

Enter mass flow rates, temperatures, and specific heats for both streams. If unknown, keep Cp ≈ 1.005 kJ/kg·K for dry air.

T_m = (m₁Cp₁T₁ + m₂Cp₂T₂) / (m₁Cp₁ + m₂Cp₂)

Used in HVAC to determine supply or mixed air temperature from outdoor and return air streams.

Use consistent units. This tool expects °C for temperature and kg/s for mass flow. Cp in kJ/kg·K cancels out.

This simplified model ignores latent effects. Use a psychrometric model for humid air mixing.