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TRG-TRC001-EN 57
Questions for Period 1
1 Given air conditions of 80°F DB and 60% RH, find the humidity ratio and
dew-point temperature.
2 Given air conditions of 85°F DB and a humidity ratio of 90 grains/lb, find the
relative humidity and wet-bulb temperature.
3 Given air conditions of 74°F WB and 60% RH, find the dry-bulb temperature
and humidity ratio.
4 Given air conditions of 80°F DB and a humidity ratio of 64 grains/lb, find the
relative humidity and wet-bulb temperature.
5 Given air conditions of 90°F DB and 68°F WB, find the dew-point
temperature and relative humidity.
Questions for Period 2
6 Given outdoor air conditions of 95°F DB, 78°F WB; indoor design conditions
of 80°F DB, 67°F WB; total airflow of 20,000 cfm; and outdoor airflow of
4,000 cfm:
a Find the dry-bulb temperature of the mixture.
b Plot all three conditions on the psychrometric chart.
c Find the wet-bulb temperature of the mixture.
7 Given outdoor air conditions of 90°F DB, 80°F WB; indoor design conditions
of 78°F DB, 65°F WB; total airflow of 40,000 cfm; and outdoor airflow of
6,000 cfm:
a Find the dry-bulb temperature of the mixture.
b Plot all three conditions on the psychrometric chart.
c Find the wet-bulb temperature of the mixture.
Questions for Period 3
8 Given a sensible heat ratio of 0.80 and indoor design conditions of 78°F DB
and 66°F WB:
a Draw the SHR line on the psychrometric chart.
b Find the dry-bulb and wet-bulb temperatures of the air where this SHR
line crosses the 90% RH curve.
Quiz