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20 TRG-TRC001-EN
notes
period two
Air Mixtures
The outdoor air quantity in this example constitutes 25% of the mixture, while
the recirculated air makes up the remaining 75%.
The next step is to determine the dry-bulb temperature of the air mixture.
This is done by multiplying the dry-bulb temperature of each air condition by its
percentage and summing the results.
For example, if the outdoor dry-bulb temperature is 95°F and it represents 25%
of the air mixture, it contributes 23.75°F (or 0.25 × 95) to the dry-bulb
temperature of the air mixture.
Similarly, if the dry-bulb temperature of the recirculated air is 80°F, it
contributes 60°F (or 0.75 × 80) to the dry-bulb temperature of the air mixture.
The sum of 23.75°F and 60°F equals 83.75°F, the resulting dry-bulb temperature
of this air mixture.
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Figure 35