Dirt thermal resistance
Thread Content
In the process of chemical engineering design, under what circumstances can the fouling thermal resistance be ignored?
When the heat exchange medium is relatively clean, the fouling thermal resistance can be ignored, right?
Generally speaking, the fouling thermal resistance of gases can be ignored, but industrial water, circulating cooling water, and tap water cannot be disregarded due to the formation of scale and corrosion. However, for simplicity in calculations, it can be omitted in the heat exchanger design calculations; instead, a coefficient of 0.85 is used when determining the heat transfer coefficient, meaning the calculated value is multiplied by 0.85 to obtain the final heat transfer coefficient taking fouling thermal resistance into account.
It’s useful, thank you so much, expert!~~
The thermal resistance due to fouling in gases is very small and can be ignored, but the thermal resistance due to fouling in liquids can generally be found in reference books; if not, values that are similar can still be obtained. 0.85K is probably an empirical value, since K is obtained. It should be possible in the estimate.