Question
In: Mechanical Engineering
Moist air initially at T1 = 140°C, p1 = 4 bar, and relitive humidity = 74%...
Moist air initially at T1 = 140°C, p1 = 4 bar, and relitive humidity = 74% is contained in a 2.0-m3 closed, rigid tank. The tank contents are cooled to T2 = 35°C.
Determine the temperature at which condensation begins, in °C
Solutions
samet mamat answered 2 years agoRelated Solutions
Moist air enters an air-conditioning system as shown in the figure below at T1 = 28°C,...
Moist air enters an air-conditioning system as shown in the
figure below at T1 = 28°C,
?1 = 85% and a volumetric flow rate of
(AV)1 = 0.89 m3/s. At the exit of
the dehumidifying section, the air is saturated,
?2 = 100%, and the condensate leaves this
section at the same temperature as the moist air. At the exit of
the heating section the moist air is at T3 =
24°C, ?3 = 50%. The system operates at steady...
Moist air enters an adiabatic humidifier system at 1 atm, 15 °C, with a relative humidity...
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 30 °C and 50% relative humidity enters a dehumidifier operating at steady state...
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...
Air undergoes a polytropic process in a piston–cylinder assembly from p1 = 1 bar, T1 =...
Air undergoes a polytropic process in a piston–cylinder assembly
from p1 = 1 bar, T1 = 295 K to p2 = 7 bar. The air is modeled as an
ideal gas and kinetic and potential energy effects are negligible.
For a polytropic exponent of 1.4, determine the work and heat
transfer, each in kJ per kg of air, (1) assuming constant cv
evaluated at 300 K. (2) assuming variable specific heats.
Air undergoes a polytropic process in a piston–cylinder assembly from p1 = 1 bar, T1 =...
Air undergoes a polytropic process in a piston–cylinder assembly
from p1 = 1 bar, T1 = 295 K
to p2 = 3 bar. The air is modeled as an ideal
gas and kinetic and potential energy effects are negligible.
For a polytropic exponent of 1.2, determine the work and heat
transfer, each in kJ per kg of air,
(1) assuming constant cv evaluated at 300
K.
(2) assuming variable specific heats.
Air undergoes a polytropic process in a piston–cylinder assembly from p1 = 1 bar, T1 =...
Air undergoes a polytropic process in a piston–cylinder assembly
from p1 = 1 bar, T1 = 295 K to p2 = 3 bar. The air is modeled as an
ideal gas and kinetic and potential energy effects are negligible.
For a polytropic exponent of 1.6, determine the work and heat
transfer, each in kJ per kg of air, (1) assuming constant cv
evaluated at 300 K. (2) assuming variable specific heats.
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.
1. Air enters a steady-state diffuser at T1 = 20 °C, P1 = 100 kPa and...
1. Air enters a steady-state diffuser at T1 = 20 °C, P1 = 100
kPa
and leaves at P2 = 105 kPa. You may assume an adiabatic
diffuser and constant specific heats. Find T2 if:
a) V1 = 10 m/s, V2 = 0 m/s
b) V1 = 100 m/s, V2 = 90 m/s
c) V1 = 500 m/s, V2 = 490 m/s
d) V1 = 1000 m/s, V2 = 990 m/s
0.2 kg/s of moist air at 45oC (DBT) and Humidity ratio 0.006 kgw/kgda (dry air) is...
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...
Air at 28 °C, 1 bar, 50% relative humidity enters an insulated chamber operating at steady...
Air at 28 °C, 1 bar, 50% relative humidity enters an insulated
chamber operating at steady state with a mass flow rate of 5 kg/min
and mixes with a saturated moist air stream entering at 4 °C, 1 bar
with a mass flow rate of 8 kg/min. A single mixed stream exits at 1
bar. Determine
(a) the relative humidity and temperature, in °C, of the exiting
stream.
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