How should coil heat exchange and partition heat exchange be determined?
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A mixing tank that needs to be heated. The incoming raw materials are at 80-85 degrees, and the temperature for the stirring reaction is 90-95 degrees. Should it be coil heating or partition heating? Preliminary calculations indicate that 15 m2 of heat exchange area is required; with a diameter of 2.4 m and a height of 3.2 m, the mixing tank should have sufficient heat exchange area.
First, you need to calculate the heat transfer coefficient inside the mixing tank, then the heat transfer coefficient on the jacket side; adding the thermal resistance of the tank walls gives you the value of K. It is also necessary to know the temperature of the heat flow within the jacket, so that the required area can be determined. If the area of the jacket is larger than the required area, then it is not necessary to use coils. There is an adjustable parameter here, namely the temperature of the heat flow; the difference between this temperature and the temperature inside the tank is what is known as the average temperature difference. With all other parameters fixed, the greater the average temperature difference, the smaller the jacket area required