Help – Selection calculation for shell-and-tube heat exchangers
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My Roots vacuum pump has a suction capacity of 26 m3/min at an absolute pressure of -0.053 Mpa; the process negative pressure level is -0.045 Mpa. The medium being pumped is hot water vapor at a temperature of 70°C; the inlet temperature for the Roots pump is required to be 50°C. So I need to install a heat exchanger before the inlet of the Roots pump to reduce the temperature of the hot steam by 20°C. My vacuum pipe is DN100. The heat exchanger requires 304 stainless steel material. I would appreciate it if the experienced professionals on this forum could help me calculate the size of the required shell-and-tube heat exchanger, as well as the inlet and outlet diameters for the refrigerant (normal temperature water). Thank you!
Since the process requirements do not call for a very high vacuum level, it is recommended to use a water jet pump, as there are no strict requirements regarding the inlet temperature of such pumps.
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