Vacuum temperature
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The design vacuum pressure for heat exchangers is generally FV:-0.1 MPa; but how should the vacuum temperature be chosen? For example, the inlet and outlet temperatures on the shell side are 40–90 degrees, while those on the tube side are 151–149 degrees
The vacuum design temperatures are determined separately for the shell side and the tube side; the highest operating temperature applied in either case is sufficient.
Heat exchanger design primarily involves heat transfer calculations; pressure is merely an important factor for ensuring fluid flow velocity, and it is a different parameter from temperature, which can be considered separately.
Just use the design temperature specified for that process