There are 10 m3/s of moist air at 22C and relative humidity of
50% that enter...
There are 10 m3/s of moist air at 22C and relative humidity of
50% that enter a
heating element until its temperature becomes 35C. Determine the
amount of
heat required and the final %Rh of the air.
Moist air at 30 °C and 50% relative humidity enters a
dehumidifier operating at steady state with a mass flow rate of
319.35 kg/min. The moist air passes over a cooling coil and water
vapor condenses. Condensate (condensed water) exits at 10 °C.
Saturated moist air exits in a separate stream at the same
temperature. The pressure remains constant at 1 bar. Determine (a)
the rate at which water is condensed, in kg/min, and (b) the heat
transfer rate during...
Moist air enters a conditioner operating at steady state at
40oC and 60% relative humidity constant pressure process at 1 atm
from to. The air is first passed over cooling coils and moisture is
removed and then is passed over heating coils to achieve the final
state of 18oC dry bulb and 10oC wet bulb.
(a) Sketch the process on the psychometric chart and
determine
(b) the dew point temperature of the mixture at the inlet of
the cooling coils...
Moist air enters an adiabatic humidifier system at 1 atm, 15 °C,
with a relative humidity of 20%. The volumetric flow rate of the
incoming moist air is 150 m3/min. Saturated water vapor at 1 atm is
injected into the flow such that the outlet temperature is 30 °C
and the outlet relative humidity is 40%. The pressure is constant
in the humidifier system. Determine the mass flow rate of the
saturated water vapor entering the humidifier at state 3,...
Moist air at 55 oF dry bulb temperature and 40% relative
humidity is first heated through a heating coil. The air is then
adiabatically humidified by saturated water vapor at 4.5 psia. The
exit air has a dry bulb temperature of 90 oF and wet bulb
temperature 65 oF. Air is supplied at a volume flow rate of 478.5
cfm. Assume sea level pressure throughout. Determine the
following.
a) Show the inlet and outlet air condition clearly on the
psychrometric...
At 200 C relative humidity of 1 m3 of air
is 60%. when temperature is kept constant and volume is reduced to
0.25 m3 find the mass of moist air that would be
condensed.
SVP of water at 200 C = 17.5mmHG R= 8.31 J
mol-1 K-1
15 m3 /min of air at 104o F and 60% relative humidity is cooled
to 59o F and 100% relative humidity, and then reheated to 68o F.
Find the following:
a. The flow rate of dry air (BDA) in kg /min.
b. The amount of water condensed during cooling stage.
c. kW of power needed for cooling the air in the cooling
stage.
d. kW of power needed for the heating step.
0.2 kg/s of moist air at 45oC (DBT) and Humidity ratio 0.006
kgw/kgda (dry air) is mixed with 0.3 kg/s of moist air at 250C
(DBT) and a humidity ratio of 0.018 kgw/kg da in an adiabatic
mixing chamber. After mixing, the mixed air is heated to a final
temperature of 40o C using a heater. Assume the barometric pressure
to be 1 atm. Find
Enthalpies of both fluids
Temperature and humidity ratio of air after mixing.
Heat transfer rate...
If at 30F the air has 25% relative humidity, what is the
relative humidity at 70F and how much moisture must be added to get
it up to 50% relative humidity.
Outside air at 10 degC, 1 bar and 40% relative humidity enters
an air conditioner operating at steady state with a mass flow rate
of 1.5kg/s. The air is first heated at essentially constant
pressure to 30 degC. Liquid water at 15 degC is then injected,
bringing the air to 25 degC, 1bar.
Determine
(a) the rate of heat transfer to the air passing through the
heating section, in kJ/s.
(b) the rate of water is injected, in kg/s.
(c)...
6 m3/s recirculated room
air at 22oC Tdb and 50% saturation, is mixed
with 1.5 m3/s of incoming fresh air at 10oC
Tdb and 6oC Twb. Determine all
properties of the mixed air that you can get form the psychrometric
chart (APPENDIX 2).