Heat exchange area of immersive coiled tube heat exchangers
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I just got a job with the following requirements: The heat exchanger tubes need to be placed directly in the water tank, and it is necessary to heat 100 tons of water from 5 degrees Celsius to 23 degrees Celsius within 1.5 hours. The steam used for heating is saturated steam at 0.5 MPa. I decided to use a coiled tube heater; when determining the overall heat transfer coefficient, should I refer to the values for submerged coil heat exchangers? There is forced convection inside the tube and natural convection outside it. How should I estimate the heat transfer area? I’m confused. Should I still use the methods for convective heat transfer to make the estimation? Please give me some guidance; I’ll give points if it’s useful~
Reference: Design parameters for gas-water heat exchangers