I’m asking for help from everyone.

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Given parameters: the inlet and outlet temperatures of the steam in the shell side are 205 and 95 degrees Celsius, respectively. The operating pressure is 0.75 Mpa. The inlet and outlet temperatures of the tube-side cooling water are 38 and 97 degrees Celsius respectively. The operating pressure is 1.6 Mpa. The cooling water flow rate is 120 t/h. This is my graduation project. I’ve already done it by referring to what’s available online. But I recently heard someone say that it should be calculated in segments. Is it still water vapor at the shell side outlet? Is it not necessary to divide it into sections? If there is also steam, which formula should be used to calculate the convective heat transfer coefficient in the shell side? The flow velocity is assumed to be 50 m/s in all calculations. Is it inappropriate? Could someone experienced give me some advice? How exactly to do it?