Calculate mixed air temperature or a missing stream temperature or percentage from two air temperatures, percentage shares, and °C, °F, or K units.
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Mixed Air Temperature Formula
The following formula can be used to calculate a mixed air temperature.
Tm = (To × %OA + Tr × %RA) / 100; %OA + %RA = 100
- Where Tm is the mixed temperature
- To is the outside air temperature
- Tr is the return air temperature
- %OA is the outside-air share of dry-air mass flow (volume share approximates it at comparable densities)
- %RA is the return-air share; %RA = 100 − %OA
Mixed Air Temperature Definition
Mixed air temperature is defined as the temperature of two different temperature bodies of air after they have reached equilibrium. This simple estimate assumes equal heat capacities, no heat transfer to surroundings, and no condensation; humidity-sensitive mixing requires an enthalpy balance.
Mixed Air Temperature Example
How to calculate mixed air?
- First, determine the temperature of the outside and return air.
Measure the temperatures of the two different volumes of air in the system.
- Next, determine the percentage of the volume of the first air.
Determine the total percentage of the volume of the outside air.
- Next, determine the percentage of the volume of the second air.
Air 2 is the remaining percentage, so the two shares total 100%. Select the value to solve for and enter the displayed quantities.
- Finally, calculate the mixed air temperature.
Use the equation above to calculate the mixed air temperature.
FAQ
A mixed air temperature is the expected temperature of the combination of two different bodies of air after they have combined and reached equilibrium.
