Question
In: Mechanical Engineering
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 chart clearly marking them as 1 and 2 respectively.
b) Show the sensible heating process and humidification process on the psychrometric chart clearly marking them. Draw the overall process line.
c) Calculate the heat transfer rate of the heating coil. Show your calculation.
d) Calculate the mass flow rate of the water vapor. Show your calculation.
e) What is the SHF value? Show clearly how you obtained it.
Solutions
samet mamat answered 2 years agoRelated Solutions
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The atmospheric air 32 °C dry bulb temperature and 70% relative humidity supplied to the cooling...
The atmospheric air 32 °C dry bulb temperature and 70% relative
humidity supplied to the cooling coil at a rate of 45m3 /min. The
air cooling to the saturated state and leaving at a temperature of
16 °C. Determine: (10 points) a- Specific humidity at each state.
b- Wet bulb and dew point temperatures at the final state c- Final
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USE EXCEL OR MATLAB IF YOU NEED Given the dry-bulb temperature, Tdb and relative humidity, Φ,...
USE EXCEL OR MATLAB IF YOU NEED
Given the dry-bulb temperature, Tdb and
relative humidity, Φ, the wet-bulb, Twb
temperature may be calculated from the psychrometric equation
(Jones, 1994):
PvsΦ – Pss =
PatmA (Twb
-Tdb )
(1)
Use your input from the Table below.
The input Twb and Tdb are in oC
(used in Eqs. (2) and (3) in Kelvin).
Pss = saturated vapor pressure at
Twb (kPa)
Pvs = saturated vapor pressure at
Tdb (kPa)
Pss =...
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 with a dry bulb temperature 75 F and a wet bulb temperature 65 F is...
Air with a dry bulb temperature 75 F and a wet bulb temperature
65 F is at a sea level pressure of 14.7 psia. Using equations to
calculate (a) humidity ratio, (b)
the relative humidity of the air, (c) enthalpy,
(d) dew point, and (e) the mass
density of the dry air. (50)
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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
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give two examples of when keeping close track of moisture in the
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Relative humidity isn't everything. Why is it that outdoor air of 80 Fo at 55% humidity...
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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.
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(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...
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...
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