Heat Exchanger Calculations for Desklib

This document contains detailed calculations for heat exchangers including density, specific heat capacity and heat transfer rate. The calculations are presented in tables and graphs for easy understanding. The subject, course code and college/university are not mentioned.

PRACTICAL ASSIGNMENT HEAT EXCHANGER

Heat exchanger Calculations
Question 1
Density
Tc(Avg) Th(Avg) Density of the cold fluid Density of hot fluid
C C Kg/m3 Kg/m3
20 20 998.1978 998.1978
21.325 26.525 997.9148 996.6347
22.36 31.61 997.6812 995.1404
23.79 38.645 997.3408 992.7154
25.7 48.03 996.8551 988.9
25.96 49.305 996.7864 988.3344
1

15 20 25 30 35 40 45 50 55
982
984
986
988
990
992
994
996
998
1000
Density of cold fluid Density of hot fluid
Temperature C
Density in Kg/m3
2

Specific Heat capacity
Tc(Avg) Th(Avg) Cp for cold fluid cp value for the hot fluid
C C KJ/kg.K KJ/kg.K
20 20 4.181072 4.181072
21.325 26.525 4.180333 4.178362
22.36 31.61 4.179829 4.177534
23.79 38.645 4.17923 4.17764
25.7 48.03 4.178588 4.179373
25.96 49.305 4.178514 4.179722
15 20 25 30 35 40 45 50 55
4.175
4.176
4.177
4.178
4.179
4.18
4.181
4.182
Specific Heat Capacity
Specific Heat of Cold fluid Specific Heat capacity of hot fluid
Temperature in C
Specific heat capacity (KJ/kg.K)
3

Heat Transfer rate calculations
Qc Qh
Heat
exchang
er
coeffice
nt
Efficen
cy of
hot
circuit
Efficen
cy of
cold
circuit
Mean
Temperat
ure
Efficency
LMTD
Heat
Transfer
Coeffice
nt
W W - % % % - -
0 0 - - - - - -
0.3699
59
0.8795
45
0.42062
6
51.404
15
21.611
72 36.50794 4.5651
59 0.08104
0.6562
33
1.5623
98
0.42001
7
51.373
63
21.565
93 36.46978 8.1248
73
0.08076
8
1.0573
45
2.5086
73
0.42147
6
51.346
73
21.633
18 36.48995 13.044
58
0.08105
6
1.5878
64
3.7739
74 0.42074 51.365
19
21.615
47 36.49033 19.608
48
0.08097
8
1.6588
7
3.9435
68
0.42065
2
51.346
94
21.605
44 36.47619 20.503
66
0.08090
6
4

Question 2
Density calculations
Tc(Avg) Th(Avg) Density of the cold fluid Density of hot fluid
C C Kg/m3 Kg/m3
26 49.5 996.7757 988.247
31.98 53.72 995.0229 986.2939
31.98 53.895 995.0229 986.2104
31.98 54.03 995.0229 986.1459
31.98 54.215 995.0229 986.0573
31.98 54.325 995.0229 986.0046
5

20 25 30 35 40 45 50 55 60
980
982
984
986
988
990
992
994
996
998
Density
Density of cold fluid Density of hot fluid
6

Specific Heat Calculations
Tc(Avg) Th(Avg) Cp for cold fluid cp value for the hot
fluid
C C KJ/kg.K KJ/kg.K
26 49.5 4.178503 4.179778
31.98 53.72 4.177508 4.181123
31.98 53.895 4.177508 4.181184
31.98 54.03 4.177508 4.181232
31.98 54.215 4.177508 4.181298
31.98 54.325 4.177508 4.181337
20 25 30 35 40 45 50 55 60
4.175
4.176
4.177
4.178
4.179
4.18
4.181
4.182
Specific Heat Capacity
Specific Heat of Cold fluid Specific Heat of hot fluid
7

Heat transfer calculations
Qc Qh
Heat
exchanger
coefficent
Efficenc
y of hot
circuit
Efficency
of cold
circuit
Mean
Temperature
Efficency
LMTD
Heat
Transfer
Coefficent
W W - % % % - -
1.114267 3.97078
9 0 20.6369
5 0.053994
2.500935 2.39160
2 1.045715 31.39407 49.2865 40.34029 17.8825
7 0.139853
2.500935 2.46480
8 1.014657 32.04675 48.81761 40.43218 17.9908
6 0.139011
2.500935 2.52128
3 0.991929 32.54182 48.46195 40.50189 18.0742
1 0.13837
2.500935 2.59867
7 0.962388 33.20866 47.9829 40.59578 18.1881
9 0.137503
2.500935 2.64469
6 0.945642 33.59894 47.70252 40.65073 18.2558
3 0.136994
8

Question 3
Density Calculations
Tc(Avg) Th(Avg) Density of the cold fluid Density of hot fluid
C C Kg/m3 Kg/m3
32 54.5 995.0165 985.9205
33.475 56.95 994.5365 984.723
33.475 56.91 994.5365 984.7428
33.475 56.835 994.5365 984.78
33.475 56.775 994.5365 984.8097
33.475 56.685 994.5365 984.8543
9

30 35 40 45 50 55 60
978
980
982
984
986
988
990
992
994
996
Density
Density of cold fluid Density of hot fluid
Specific Heat Calculation
Tc(Avg) Th(Avg) Cp for cold fluid cp value for the hot fluid
C C KJ/kg.K KJ/kg.K
32 54.5 4.177506 4.1814
33.475 56.95 4.177439 4.182329
33.475 56.91 4.177439 4.182314
33.475 56.835 4.177439 4.182284
33.475 56.775 4.177439 4.18226
33.475 56.685 4.177439 4.182225
30 35 40 45 50 55 60
4.174
4.175
4.176
4.177
4.178
4.179
4.18
4.181
4.182
4.183 Specific Heat Capacity
Specific Heat of Cold fluid
Specific Heat of hot fluid
10

Heat transfer rate calculation
Qc Qh
Heat
exchanger
coefficent
Efficenc
y of hot
circuit
Efficency
of cold
circuit
Mean
Temperature
Efficency
LMTD
Heat
Transfer
Coefficent
W W - % % % - -
1.253277 2.71791 0 18.3250
2 0.068392
1.597903 1.65202 0.967242 20.30848 58.99743 39.65296 19.5833 0.081595
1.597903 1.63528
5 0.97714 20.14426 59.11901 39.63163 19.5580
7 0.0817
1.597903 1.60390
6 0.996257 19.8345 59.34833 39.59141 19.5107
4 0.081899
1.597903 1.57880
3 1.012097 19.58495 59.53307 39.55901 19.4728
4 0.082058
1.597903 1.54115 1.036825 19.20771 59.81235 39.51003 19.4159
4 0.082299
11

Question 4
Density Calculation
Tc(Avg) Th(Avg) Density of the
cold fluid
Density of hot
fluid
C C Kg/m3 Kg/m3
33.5 56.5 994.5282 984.9457
35.395 59.035 993.8849 983.6751
35.395 59.07 993.8849 983.6573
35.395 59.13 993.8849 983.6267
35.395 59.18 993.8849 983.6012
35.395 59.225 993.8849 983.5783
12

30 35 40 45 50 55 60 65
978
980
982
984
986
988
990
992
994
996 Density
Density of cold fluid Density of hot fluid
Specific Heat Capacity Calculations
Tc(Avg) Th(Avg) Cp for cold fluid cp value for the
hot fluid
C C KJ/kg.K KJ/kg.K
33.5 56.5 4.177439 4.182152
35.395 59.035 4.177439 4.183189
35.395 59.07 4.177439 4.183204
35.395 59.13 4.177439 4.18323
35.395 59.18 4.177439 4.183251
35.395 59.225 4.177439 4.183271
13

30 35 40 45 50 55 60 65
4.174
4.175
4.176
4.177
4.178
4.179
4.18
4.181
4.182
4.183
4.184
Specific Heat Capacity
Specific Heat of Cold fluid Specific Heat of hot fluid
Heat Transfer Calculations
Qc Qh
Heat
exchanger
coefficent
Efficenc
y of hot
circuit
Efficency
of cold
circuit
Mean
Temperature
Efficency
LMTD
Heat
Transfer
Coefficent
W W - % % % - -
0.800644 1.46375
3 0 19.2536
7 0.041584
1.002197 0.43296 2.314757 5.298183 73.68825 39.49322 19.7820
3 0.050662
1.002197 0.44760
3 2.239032 5.467552 73.55646 39.51201 19.8041
7 0.050605
1.002197 0.47270
5 2.120133 5.756495 73.33164 39.54407 19.8421
2 0.050509
1.002197 0.49362
4 2.030286 5.995935 73.14533 39.57063 19.8737
1 0.050428
1.002197 0.51245
1 1.955695 6.210393 72.97845 39.59442 19.9021
3 0.050356
14

15

Comparison of Heat transfer coefficients
1 2 3 4 5 6
0
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
0.1
0.11
0.12
0.13
0.14
0.15
U for Condition 1 U for condition 2
U for Condition 3 U for condition 4
Here all the calculations are done by using the excel software. And the excel file was attached
here.
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