Question

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.

Answer #1

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 ft3/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....

Air enters the evaporator section of a window air conditioner at
14.7 psia and 90°F with a volume flow rate of 200 ft3 /min.
Refrigerant-134a at 20 psia with a quality of 30 percent enters the
evaporator at a rate of 4 lbm/min and leaves as saturated vapor at
the same pressure. Determine (a) the exit temperature of the air
and (b) the rate of heat transfer from 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...

An air conditioning system is to take in outdoor air at 283K and
30percent relative humidity at a steady rate of 45 m3/min and to
condition it to 298K and 60% relative humidity. The outdoor air is
first heated to 295K in the heating section and then humidified by
the injection of hot steam in the humidifying section. Assuming the
entire process takes place at a pressure of 100kPa, determine (i)
the rate of heat supply in the heating section...

Air from outside (5 deg-C, 50% relative humidity) is heated by
an electrical heater to a temperature of 35 deg-C at a mass flow
rate of 10 kg/s (dry air). Determine the relative humidity of the
conditioned air at the exit

Liquid propane enters a combustion chamber at 77⁰F and at a rate
of 0.75 lbm/min where it is mixed and burned with 150% excess air
that enters the combustion chamber at 40⁰F. If the combustion is
complete and the exit temperature of the combustion gases is 1800
R, determine (a) the mass flow rate of the air and (b) the rate of
heat transfer from the combustion chamber.

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.

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,...

In a condenser, humid air at atmospheric pressure, 35 degree
celsius and 90% relative humidity enters the process at a rate of
2.12 m3/s. Liquid water exits as a condensate. If the
air exits at 20 degree celsius, determine the molal humidity of
outlet air, absolute humidities of inlet and outlet air and flow
rate of condensate in L/s.

An air handling unit combines return air at 75o F and 60%
relative humidity with outside air at 50o F and 30% relative
humidity. The mixed air temperature is 60 o F and the volume flow
rate of the mixed air is 1700 CFM. Find the volume flow rate of the
outside air and the relative humidity of the mixed air. The
building is located at 5000 foot elevation.
Answer:
RHmix = 55% and V_dot_mix = 951 CFM

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