ME 404

Group No. :

Experiment No. : 01

Experiment Name:

Date of Performance: 12-05-2015

Date of Submission: 13-05-2015

Name: Nahian Hyder

Department: ME

Roll No.: 0910108

Section: B

Objective:

To observe different parts of a cooling tower.

To observe the set-up of cooling tower.

To analyse the performance of the cooling tower.

Line Diagram:

Apparatus:

Hygrometer

Manometer

o manometer for water flow measurement

o Water manometer for air flow measurement

Thermometer

Condenser

Tower Air

Blower

Water Pump

Valve

Orifice

Data Sheet

1. Physical dimensions:

a. Cooling tower

i. Length, = 2.00

ii. Breadth, = 1.88

iii. Height, = 2.61

iv. Fill of the tower = 2 1.88 2.61 = 9.8136

b. Air duct

i. Duct diameter, = 0.482

ii. Orifice diameter, = 0.216

c. Water pipe:

i. Pipe diameter, = 0.076

ii. Orifice diameter, = 0.032

2. Atmospheric conditions during experiment

a. Atmospheric pressure, = 760

b. Dry bulb temperature, = 26

c. Wet bulb temperature, = 24

3. Operating condition during experiment

No.

of

Obs.

Water Flow Data Air Flow Data

()

()

()

()

()

()

1 40 31.6 27.3

17

29 22

2 35 34 27.8 30 29

3 25 36.8 27.9 31 30

4 15 39.7 28.2 33 31

5 10 43.5 28.7 32 31

Calculation Sheet

No. of Obs. 1. 2. 3. 4. 5.

Density of air (/ ) 1.18

Air flow rate, (/) 0.445

Water flow rate ( ) 1.602 1.498 1.266 0.981 0.801

Water Air Ratio / 3.598 3.365 2.844 2.203 1.799

Sp. Humidity of Inlet Air ( . . ) 0.018 0.018 0.018 0.018 0.018

Sp. Humidity of Outlet Air ( . . ) 0.020 0.024 0.029 0.029 0.030

( . . ) 0.002 0.006 0.011 0.011 0.012

Make-up Water () 0.001 0.003 0.005 0.005 0.005

% Make-up 0.042 0.178 0.369 0.499 0.639

Actual Cooling Range () 4.300 6.200 8.900 11.500 14.800

Theoretical Cooling Range () 7.600 10.000 12.800 15.700 19.500

Cooling Efficiency 56.579 62.000 69.531 73.248 75.897

Heat of Incoming Hot Water () 212.212 213.523 195.276 163.966 145.919

Heat of Outgoing Hot Water () 183.420 174.705 148.182 116.012 96.397

Heat of Dry Inlet Air () 133.795

Heat of water vapour in Air at Inlet () 24.493

Heat of Dry Outlet Air () 135.138 135.585 136.033 136.928 136.480

Heat of Water Vapour in Air at Outlet () 26.583 32.737 38.899 39.630 40.289

Unaccounted Heat () 30.134 40.608 49.332 51.086 52.206

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0

10

20

30

40

50

60

70

80

1.7 1.9 2.1 2.3 2.5 2.7 2.9 3.1 3.3 3.5

% M

ake

-up

Wat

er

Co

olin

g E

ffic

ien

cy

Water-Air Ratio

Cooling Efficiency vs % make-up water and Water-Air Ratio

Efficiency vs Water-Air Ratio % make-up vs Water-Air Ratio

Discussion