Page 114 - Design and Operation of Heat Exchangers and their Networks

102 Design and operation of heat exchangers and their networks

Example BA3,5 2 2
B A
1 1
ν a B , b B Þ
ð
ε 1 ¼ 1
½
ðÞ=ϕŠ
1+ hb B , a B , Kb A
(3.185)
0:7007
¼ 1 ¼ 0:3777
1+ 0:1258

Example BA3,6 2 2
B A
1 1

ð
ν a B , b B Þν ∗ a A , b A Þ
ð
ε 1 ¼ 1
ðÞ=ϕŠ
½
ð
ν ∗ a A , b A Þ hb B , a B , Kb A
(3.186)
0:7006 0:7593
¼ 1 ¼ 0:3792
0:7593 0:0976Þ
ð
Example BA4,5 2 2
B A
1 1
ð
ð
R 1 ν a A , b A Þν a B , b B Þ
ε 1 ¼ 1
1 R 1 1 ν a A , b A Þ ν a B , b B Þ½ ð ð Š μ a A , b A , b B , ϕÞ
ð
1
(3.187)
2 0:7579 0:7006
¼ 1 ¼ 0:3783
1 2 1 0:7579 0:7006Þ 0:20894
ð
Example BA4,6 2 2
B A
1 1
R 1 ν a A , b A Þν a B , b B Þ
ð
ð
ε 1 ¼ 1
ð
1 R 1 1 ν a A , b A Þ ν a B , b B Þ½ ð ð Š μ a A , b A , b B , ϕÞ
2
(3.188)
2 0:7579 0:7006
¼ 1 ¼ 0:3798
1 2 1 0:7579 0:7006Þ 0:20485
ð