When condensing flue gas containing unknown components, how is the heat flow rate of the flue gas determined?
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The operating pressure in the shell side, the inner diameter of the shell, the specifications and number of heat exchange tubes, the mass flow rate of the flue gas, as well as the inlet and outlet temperatures of the two fluids (200 for the flue gas at the inlet and 100 at the outlet) are all known. Based on these values, it is possible to determine an approximate range for the flow rate of the cooling water. However, I believe that the condensation of the flue gas involves three factors: a drop in the temperature of the flue gas, condensation, and a drop in the temperature of the liquid. Therefore, I feel that simply using the formula flow rate * latent heat to calculate the flue gas flow rate is not accurate. I hope experts can help clarify this issue
It’s possible to calculate each case separately for comparison. Theoretically, you are correct, but there is still a difference between theoretical concepts and practical engineering applications. In engineering applications, safety factors are taken into account, and all uncertain factors are considered; moreover, some relatively small values are omitted to simplify the calculations
Approximate calculations can be found in most engineering textbooks used in universities