Page 207 - Design and Operation of Heat Exchangers and their Networks

196 Design and operation of heat exchangers and their networks

Number of pass divider lane in tube bundle in crossflow direction N tp
Number of tubes N t , Eq. (5.11)
Number of tubes in one window section N tw , Eq. (5.22)
Number of tubes in crossflow section N tc , Eq. (5.24)
Number of effective tube rows in crossflow section N rc , Eq. (5.13)
Number of effective tube rows in window section N rw , Eq. (5.14)

Number of sealing strips per side N ss
Shell-side hydraulic diameter d h,s , Eqs. (5.36), (5.37)
Shell-side hydraulic diameter in window section d hw , Eq. (5.76)
Shell inside diameter d s
Tube bundle outer tube limit diameter d otl , Eq. (5.10)
Tube bundle outer tube center diameter d ctl , Eq. (5.12)
Shell-to-tube bundle clearance δ st , Eqs. (5.4)–(5.9)
Shell-to-baffle clearance δ sb , Eq. (5.15)
Baffle hole-to-tube clearance δ bt
Baffle cut l c
Baffle diameter d b
Baffle hole diameter d bt , Eq. (5.16)
Central angle of baffle cut θ ds , Eq. (5.17)
Upper central angle of baffle cut θ ctl , Eq. (5.18)
Central baffle spacing l bc , Eq. (5.19)
Inlet and outlet baffle spacing l bi , l bo
Number of baffles N b , Eq. (5.20)
Fraction of tubes in baffle window F w , Eq. (5.21)
Fraction of tubes in crossflow section F c , Eq. (5.23)
Shell-side crossflow area A sc , Eqs. (5.26)–(5.27)
Shell-side flow area in window section A sw , Eq. (5.25)
Shell-to-baffle leakage area A sb , Eq. (5.28)
Baffle hole-to-tube leakage area A bt , Eq. (5.29)
Shell-to-tube bundle bypass area A bp , Eq. (5.31)
The tube layout patterns are shown in Fig. 5.2. According to Sinnott (2005),
the recommended tube pitch (distance between tube centers) is 1.25 times
the tube outside diameter:

s ¼ 1:25d o (5.4)
The clearance between the outermost tubes in the bundle and the shell
inside diameter is defined as

(5.5)
δ st ¼ d s d otl