When recovering the latent heat from flue gas, preheating is used; how is this heat transfer temperature difference determined?
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To recover the latent heat from flue gas, there is vapor condensation and cooling, as well as cooling of the flue gas itself. How is the heat transfer temperature difference calculated in this case? The inlet temperature of the flue gas is 180 degrees, while the outlet temperature is 50 degrees. The dew point temperature of water vapor is 51.5 degrees. Is the temperature of the condensed water the temperature of the condensate film? The temperature is in the 40s; so how does one calculate the heat transfer temperature difference? I earnestly implore the experts for their guidance
The temperature difference for the flue gas ranges from 180°C to 50°C. The temperature difference for water vapor can be calculated in three segments: from 180°C to 51.5°C, from 51.5°C to 51.5°C (the condensation of water releases a large amount of latent heat), and then from 51.5°C down to 50°C.