Experiment: A cooling tower uses forced air and column packing to cool downward-flowing water. Inlet water temperature and water flow rate are varied to investigate effects on outlet water temperature, outlet air temperature, and outlet air humidity. The system is first observed operating with ambient room temperature water. A heat load is then applied to the water tank, and the system response is observed. This is to simulate a power plant starting up and placing a cooling load on the cooling water supply. The aim is to compare the system response with and without the load. Data from the Experiment and the make-up water mass flow rate are both shown in the following tables below.For the load cases, determine the net rate of water evaporation from the cooling water to the air using the equation for air flow rate. Compare this with the rate at which make-up water enters the system.For the load cases, determine the rate of work supplied by the pump and compare it to the pump power provided by the vendor, 100W. Discuss any discrepancies. The make-up water mass flow rate is shown in the following table:Tower 1Tower 2No heat3x10-4 kg/s3.78x10-4 kg/s0.5 kW3.2x10-4 kg/s1 kW3.69x10-4 kg/s ParameterInlet air dry bulb temperatureInlet air wet bulb temperatureOutlet air dry bulb temperatureOutlet air wet bulb temperatureInlet water temperatureOutlet water temperatureAir pressureWater flow rate(Part A)Air flow rateWater evaporation rateMakeup water rate(Part B)Pump powerSymbolT₁T₂T3T4T5T6Раmwm a,o3 3 3memmW PDimension°C°C°C°C°C°CmmH₂Og/skg/skg/skg/skWNo Load25.217.319.717.718.31814.348.10.5 kW load 1 kW load26.224.719.218.12622.824.321.129.824.725.221.414.114.446.647.7

To determine the rate of air flow, evaporation and make up water and pump power

Answered: ir flow rate Water evaporation rate…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Experiment: A cooling tower uses forced air and column packing to cool downward-flowing water. Inlet water temperature and water flow rate are varied to investigate effects on outlet water temperature, outlet air temperature, and outlet air humidity. The system is first observed operating with ambient room temperature water. A heat load is then applied to the water tank, and the system response is observed. This is to simulate a power plant starting up and placing a cooling load on the cooling water supply. The aim is to compare the system response with and without the load. Data from the Experiment and the make-up water mass flow rate are both shown in the following tables below.

For the load cases, determine the net rate of water evaporation from the cooling water to the air using the equation for air flow rate. Compare this with the rate at which make-up water enters the system.
For the load cases, determine the rate of work supplied by the pump and compare it to the pump power provided by the vendor, 100W. Discuss any discrepancies.

The make-up water mass flow rate is shown in the following table:
Tower 1
Tower 2
No heat
3x10-4 kg/s
3.78x10-4 kg/s
0.5 kW
3.2x10-4 kg/s
1 kW
3.69x10-4 kg/s

Parameter
Inlet air dry bulb temperature
Inlet air wet bulb temperature
Outlet air dry bulb temperature
Outlet air wet bulb temperature
Inlet water temperature
Outlet water temperature
Air pressure
Water flow rate
(Part A)
Air flow rate
Water evaporation rate
Makeup water rate
(Part B)
Pump power
Symbol
T₁
T₂
T3
T4
T5
T6
Ра
mw
m a,o
3 3 3
me
mm
W P
Dimension
°C
°C
°C
°C
°C
°C
mmH₂O
g/s
kg/s
kg/s
kg/s
kW
No Load
25.2
17.3
19.7
17.7
18.3
18
14.3
48.1
0.5 kW load 1 kW load
26.2
24.7
19.2
18.1
26
22.8
24.3
21.1
29.8
24.7
25.2
21.4
14.1
14.4
46.6
47.7

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