Calculation of the heat exchange area for cooling hot water using carbon steel coiled tubes
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To lower the temperature of the hot water in a 5-ton water tank from 80 degrees to 50 degrees, coiled tubes are planned to be installed in the tank; these are carbon steel coiled tubes with a DN40 diameter. The circulating water flowing through these tubes has a temperature of 30 degrees at the inlet and 38 degrees at the outlet. What should be the heat exchange area of these coiled tubes? In other words, for a DN40 coiled tube, what length is required to reduce 5 tons of hot water from 80 degrees to 50 degrees? Please provide the calculation formula and the step-by-step calculation process.
It can only be determined through relevant process calculations; you need to specify the time required for cooling.
It’s about a thirty-minute cooling time.