1-2 TEMA H Shell and Tube
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 H shell and tube heat exchanger has an H type shell in which the shell side fluid enters at two center inlets, splits and flows to each end and the center, and then leaves at two center outlets. The two tube passes are arranged in an overall counterflow configuration and the shell and tube fluids are mixed in each pass at a cross section. The effectiveness-NTU solution is available for 1-2 TEMA H shell and tube heat exchangers. 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('12TEMAH', Ntu, C_dot_1, C_dot_2, 'epsilon')
{Solution:
epsilon = 0.7757}
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('12TEMAH', 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 = 1.27
UA = 38.1}