1-2 TEMA E Shell and Tube with parallel shell flows
A shell and tube heat exchanger consists of an outer shell filled with a tube bank. The shell side fluid flows in the shell, around the tube, while the tube side fluid flows through the tubes. There are many shell and tube configurations characterized by, among other things, the shell type and the number and configuration of the shell and tube flows. A 1-2 TEMA E shell and tube heat exchanger with parallel shell flows has an E type shell in which the shell side fluid enters at one end and leaves at the other. However, the shell fluid is split into two parallel streams such that each stream interacts with only one tube pass. The effectiveness-NTU solution is available for 1-2 TEMA E shell and tube heat exchangers with parallel shell flows. Solution is from Rohsenow et al.
Example 1:
$UnitSystem SI Mass J K Pa
$VarInfo UA C_dot_1 C_dot_1 C_dot_min Units = 'W/K'
$VarInfo epsilon NTU Units = '-'
UA = 75 [W/K]
C_dot_1 = 50 [W/K]
C_dot_2 = 30 [W/K]
C_dot_min = Min(C_dot_1,C_dot_2)
NTU = UA/C_dot_min
epsilon=hx('12TEMAE_2shellsidestreams', Ntu, C_dot_1, C_dot_2, 'epsilon')
{Solution:
epsilon = 0.7272}
Example 2:
$UnitSystem SI Mass J K Pa
$VarInfo UA C_dot_1 C_dot_1 C_dot_min Units = 'W/K'
$VarInfo epsilon NTU Units = '-'
C_dot_1 = 50 [W/K]
C_dot_2 = 30 [W/K]
epsilon = 0.61
NTU=hx('12TEMAE_2shellsidestreams', epsilon, C_dot_1, C_dot_2, 'NTU')
C_dot_min = Min(C_dot_1,C_dot_2)
UA = NTU*C_dot_min
{Solution:
NTU = 1.393
UA = 41.8}