Question

Air at 95°F, 1 atm, and 10% relative humidity enters an
evaporative cooler operating at steady state. The volumetric flow
rate of the incoming air is 1765 ft^{3}/min. Liquid water
at 68°F enters the cooler and fully evaporates. Moist air exits the
cooler at 70°F, 1 atm. There is no significant heat transfer
between the device and its surroundings and kinetic and potential
energy effects can be neglected.

a)Determine the mass flow rate of the dry air in lb(dry air)/min.

b)the relative humidity at the exit

c)the dew point temperature at the exit

Answer #1

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...

Atmosphric air at 40 F and 50% relative humidity enters the heating
section of an airconditioning device at a volumetric flow rate of
100ft^3/min. Water vapor is added to the heated air to increase the
relative humidity to 55%. The temperature after the heating section
is 72F and the temperature at the exit is 74F. Using the
appropriate fomulas:
a) determine the rate of the heat transfer in Btu/min.
b) determine the mass flow of water vapor in lbm/min.

4.58 Air enters a compressor operating at
steady state with a pressure of 14.7 lbf/in^2, a temperature of 808
F, and a volumetric flow rate of 18 ft /s. The air exits the
compressor at a pressure of 90 lbf/in^2 Heat transfer from the
compressor to its surroundings occurs at a rate of 9.7 Btu per lb
of air flowing. The compressor power input is 90 hp. Neglecting
kinetic and potential energy effects and modeling air as an ideal
gas,...

Air enters a compressor operating at steady state at 15.4
lbf/in^2, 80°F with a volumetric flow rate of 424 ft^3/min and
exits at 176.4 lbf/in^2, 260°F. Heat transfer occurs at a rate of
6800 Btu/h from the compressor to its surroundings. Assuming the
ideal gas model for air and neglecting kinetic and potential energy
effects, determine the power input, in hp.

Problem #2
Air at 80°F and 80% relative humidity are cooled to 51°F at a
constant pressure of 1 atm. Use the psychrometric chart to
calculate the fraction of water that condenses, and the rate at
which heat must be removed to deliver 1,000 ft3 /min of humid air
at the final conditions.

A
humid air stream enters a process at 35 C, 20 atm, and 50% relative
humidity. The oxygen flows at 900kmol/h. Determine the molar flow
rate of water in the stream.

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