Page 341 - Design and Operation of Heat Exchangers and their Networks

Dynamic analysis of heat exchangers and their networks 327

_ _
sC c + C c + U C h
e e
θ h ¼ 2 θ h,in
_
_
sC h + C h + U sC c + C c + U U
_
C c U
e
+ 2 θ c,in
_
_
sC h + C h + U sC c + C c + U U

_
sC c + C c + U ð t h,in t h Þ
e _
+ 2 ΔC h
_
_
sC h + C h + U sC c + C c + U U
ð
U t c,in t c Þ
e _
+ 2 ΔC c
_
_
sC h + C h + U sC c + C c + U U

_
sC c + C c ð t c t h Þ
Δ e U
+ 2
_
_
sC h + C h + U sC c + C c + U U

_
ð
sC c + C c + U ð ^ t h t h Þ + U ^ t c t c Þ
(7.19)
+ 2
_
_
sC h + C h + U sC c + C c + U U
_
C h U
e e
θ c ¼ 2 θ h,in
_
_
sC h + C h + U sC c + C c + U U

_ _
sC h + C h + U C c
e
+ 2 θ c,in
_
_
sC h + C h + U sC c + C c + U U
ð
U t h,in t h Þ e _
+ 2 ΔCh
_
_
sC h + C h + U sC c + C c + U U

_
sC h + C h + U ð t c,in t c Þ
e _
+ 2 ΔC c
_
_
sC h + C h + U sC c + C c + U U

_
sC h + C h ð t h t c Þ
Δ e U
+ 2
_
_
sC h + C h + U sC c + C c + U U

_
ð
sC h + C h + U ð ^ t c t c Þ + U ^ t h t h Þ
+ 2 ð7:20Þ
_
_
sC h + C h + U sC c + C c + U U