Chemical Engineering February 2012 - 30

Feature Report
Flowrate
TABLE 2. TYPICAL THERMAL CALCULATIONS OF COUNTER-FLOW COOLING TOWER
3,000 m3/h
Wet-bulb temperature
Approach
29
4
Assumed dry-bulb temperature 30.12
Assumed L/G
No. of cells
1.575
3
Cell length
Cell width
Air inlet height
Design RH
Density of water
Altitude
14
14
m
m
5.5 m
92%
1,000 kg/m3
10
m
°C
°C
°C
Hot water temperature
Cold water temperature
Range
Heat load
Barometric pressure (p)
Water vapor saturation pressure (pws),
at tdb
Partial pressure of water vapor (pw)
Water vapor saturation pressure (pws),
at twb
Recalculating twb
Difference
Dew point temperature (td) of moist air
(for temperature between 0 and 93°C)
Inlet twb
RH
INLET AIR PROPERTIES
29
92%
Inlet tdb at above RH
Humidity ratio (W)
Specific volume (v)
Density
30.12
°C
0.0252 kg water/kg dry
air
0.8951 m3/kg, dry air
1.1172 kg/m3, dry air
Humidity ratio at saturation (Ws) 0.0274 kg water/kg
moist air
Specific volume, (v) at saturation
Density
Enthalpy
of moist air
Humidity Ratio at twb
Enthalpy at twb
0.8983 m3/kg, moist air
1.1133 kg/m3, moist air
94.5702 kJ/kg
0.0256 kg water/kg
moist air
94.6668 kJ/kg
43
33
10
°C
°C
°C
29943888.32 kcal/h
101.2
kPa
4.2754
3.9333
4.0083
29.0
0.0
28.66
kPa
kPa
kPa
°C
°C
°C
EXIT AIR PROPERTIES
°C
Enthalpy
Exit air temperature (tdb)
Water vapor saturation pressure (pws),
at tdb
Put some value of exit RH (Assuming it is
in between 97 and 99%)
Partial pressure of water vapor (pw)
Humidity ratio (W) at above tdb
Enthalpy of exit air
Difference
Exit twb
Water vapor saturation pressure (pws) at
exit twb
Recalculating twb
Difference
Dew point temperature (td) of moist air
(for temperature between 0 and 93°C)
AIR FLOW
Average density dry
Average density wet
Air flowrate at fin
Air flow at inlet, at rain zone
Air flowrate at fan
1.0827 kg/m3
1.0801 kg/m3
162.90 m3/s, per cell
157.87 m3/s, per cell
168.26 m3/s, per cell
Specific volume (v)
Density
Humidity ratio (Ws) at saturation
Specific volume (v) at saturation
Density
KaV/L
Constant related to tower design (C)
160.50
39.55
7.2097
98.5
7.1016
kJ/kg
°C
kPa
%
kPa
0.04692 kg water/kg
dry air
160.50
0.00
39.31
7.1170
39.31
0.00
39.24
°C
0.9540 m3/kg, dry
air
1.0482
0.0477
kg/m3, dry
air
kg water/kg
moist air
0.9551 m3/kg, moist
air
1.0470
1.7533
2.522
kg/m3, moist
air
°C
kPa
°C
kJ/kg
28 CHEMICAL ENGINEERING WWW.CHE.COM FEBRUARY 2012

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Chemical Engineering February 2012

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Contents
Chemical Engineering February 2012 - Cover1
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Chemical Engineering February 2012 - 2
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