Question
In: Mechanical Engineering
Air enters an air conditioning unit at 32oC, 80% relative humidity, and with a mass flowrate...
Air enters an air conditioning unit at 32oC, 80% relative humidity, and with a mass flowrate of 12 kg/min. It is to be conditioned to 25oC and 50% relative humidity. In order to do this, part of the moisture in the air must be removed as condensate at 30oC. Be able to draw the path that the atmospheric air takes on the psychrometric chart. Find
a. The rate of moisture removal from the air, mw
b. The rate of heat removal from the air, in kW
c. The temperature to which the incoming humid air must be cooled to achieve the desired rate of condensation
Solutions
samet mamat answered 2 years agoRelated Solutions
An air conditioning system is to take outdoor air at 30 oC and 70% relative humidity...
An air conditioning system is to take outdoor air at 30
oC and 70% relative humidity at a steady rate of 10
m3/s and to condition it to 25 oC and 50%
relative humidity. The outdoor air is first cooled down to 13.9
oC using cooling coil and then heated to the desired
condition in the heating section. Assuming the air is at 1 atm
pressure,
Draw the air conditioning process on the attached psychometric
chart.
Determine the mass flow...
Relative humidity isn't everything. Why is it that outdoor air of 80 Fo at 55% humidity...
Relative humidity isn't everything. Why is it that outdoor air
of 80 Fo at 55% humidity will feel more “muggy” than a 50 Fo cave
at 75% humidity? What other parameter is a better measure of the
actual amount of moisture in the air, and how do we define it? Then
give two examples of when keeping close track of moisture in the
air is important.
Relative humidity isn't everything. Why is it that outdoor air of 80 Fo at 55% humidity...
Relative humidity isn't everything. Why is it that outdoor air
of 80 Fo at 55% humidity will feel more “muggy” than a 50 Fo cave
at 75% humidity? What other parameter is a better measure of the
actual amount of moisture in the air, and how do we define it? Then
give two examples of when keeping close track of moisture in the
air is important.
Air enters a window air conditioner at 1 atm, 36oC and 75% relative humidity (??) at...
Air enters a window air conditioner at 1 atm, 36oC
and 75% relative humidity (??) at a rate of 12m3/min and
it leaves as saturated air at 18oC. Part of the moisture
in the air which condenses during the process is also removed at
18oC. Determine (a) the rate of heat
(Q?) and (b) moisture removal from the air. (c)
What-if Scenario: What would the rate of heat
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Outside air at 10 degC, 1 bar and 40% relative humidity enters an air conditioner operating...
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)...
If at 30F the air has 25% relative humidity, what is the relative humidity at 70F...
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.
Moist air enters a conditioner operating at steady state at 40oC and 60% relative humidity constant...
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...
Moist air enters an adiabatic humidifier system at 1 atm, 15 °C,
with a relative humidity of 20%. The volumetric flow rate of the
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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)
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1222 Air enters a heating section at 100 kPa, 9oC, 45% relative humidity at rate of...
1222
Air enters a heating section at 100 kPa, 9oC, 45%
relative humidity at rate of 10m3/min, and it leaves at
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(Q?) in the heating section and (b) the
relative humidity (??) at the exit. (c) What-if
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