Question
In: Physics
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.
Solutions
genius_generous answered 1 year agoRelated Solutions
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.
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...
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...
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 at 55 oF dry bulb temperature and 40% relative humidity is first heated through...
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...
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
removal be if moist air entered the dehumidifier at 95 kPa instead...
Air at 35°C and 33% relative humidity is used for drying a food product. The air...
Air at 35°C and 33% relative humidity is used for drying a food
product. The air is first heated to 90°C and then cooled
adiabatically to an exit dry bulb temperature of 40°C. (a) How much
moisture did the air pick up? (b) Calculate the change in enthalpy
from the initial unheated air to the final moist air. (c) If the
food is dried from 85% moisture to 20% moisture (both on a wet
basis) at an inlet flow rate...
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.
Air at 38.0°C and 99.0% relative humidity is to be cooled to 16.0°C and fed into...
Air at 38.0°C and 99.0% relative humidity is to be cooled to
16.0°C and fed into a plant area at a rate of 510.0
m3/min. You may assume that the air pressure is 1 atm in
all stages of the process.
Calculate the rate the water condenses in kg/min.
Air at a temperature of 20 0C and 750 mm Hg has a relative humidity of...
Air at a temperature of 20 0C and 750 mm Hg has a relative
humidity of 80%. Calculate,
(i)The molal humidity of the air
(ii)The molal humidity of this air if its temperature is reduced
to 10 °C and pressure increased to 2000 mm Hg condensing out some
of the water
(iii)Weight of water condensed from 1000 litre of the original
wet air
Vapour pressure of water at 20 °C =
17.5 mm Hg
Vapour pressure of water at 10...
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