Calculation of heat exchangers
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I designed a heat exchanger; the heat exchange tubes have dimensions of 25X2.5. Saturated water flows inside these tubes, and after passing through they turn into saturated steam, at a pressure of 1.6 MPa and a flow rate of 20.5 T； Gas flows through the shell side; the temperature drops from 850 to 350, the pressure is 15 KPa, and the flow rate is 48400 NM3/h. Please tell me how to calculate the heat transfer coefficients on the inside and outside of the tubes, or how to determine the K value. Also, what type of heat exchanger should be chosen, and how many tube passes are needed?
Reply to 1# quanjiansen: This should be an evaporator. It is recommended to use a vertical type with a single pass flow. For design calculations, you can check out the heat exchanger design software available in the ASPEN community; HTFS or HTRI can be used for such tasks.