TRG-TRC001-EN 57
Questions for Period 1
1Given air conditions of 80°F DB and 60% RH, find the humidity ratio and
dew-point temperature.
2Given air conditions of 85°F DB and a humidity ratio of 90 grains/lb, find the
relative humidity and wet-bulb temperature.
3Given air conditions of 74°F WB and 60% RH, find the dry-bulb temperature
and humidity ratio.
4Given air conditions of 80°F DB and a humidity ratio of 64 grains/lb, find the
relative humidity and wet-bulb temperature.
5Given air conditions of 90°F DB and 68°F WB, find the dew-point
temperature and relative humidity.
Questions for Period 2
6Given 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:
aFind the dry-bulb temperature of the mixture.
bPlot all three conditions on the psychrometric chart.
cFind the wet-bulb temperature of the mixture.
7Given 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:
aFind the dry-bulb temperature of the mixture.
bPlot all three conditions on the psychrometric chart.
cFind the wet-bulb temperature of the mixture.
Questions for Period 3
8Given a sensible heat ratio of 0.80 and indoor design conditions of 78°F DB
and 66°F WB:
aDraw the SHR line on the psychrometric chart.
bFind the dry-bulb and wet-bulb temperatures of the air where this SHR
line crosses the 90% RH curve.
Quiz