Calculation problems for unsteady heat transfer processes
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100m3 reactor vessel with coiled tubes; both the vessel and the tubes are made of Q345 material. The heat exchange area is 40㎡. The inlet temperature of the chilled fresh water is 3℃, while the outlet temperature varies and is not fixed. The reaction vessel is of batch type; 80 m3 of hot water is added, and after the temperature drops to 40°C, the water is removed. How long does it take for the temperature to drop from 80°C to 40°C, and how is this calculated?
Question 35 in Chapter 6 of the first volume of the second edition of Chemical Engineering Principles by Chen Minheng can be found in the references