Overall heat transfer coefficient of the heat exchanger
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Dear all**, how can we qualitatively evaluate the overall heat transfer coefficient of a heat exchanger? Which has a higher heat transfer coefficient: a graphite tube with graphite pores or a stainless steel tube condenser? Can the overall heat transfer coefficient of a heat exchanger be qualitatively analyzed by referring to the convective heat transfer coefficient? Please everyone **analyze it!**
I only know that the overall heat transfer coefficient K is related to the heat transfer coefficients αo and αi of the fluids on both sides of the heat exchanger, as well as the heat transfer coefficient λ of the solid wall surface and the wall thickness b. If it is not a new heat exchanger, the fouling thermal resistance also needs to be considered. Please don’t laugh at me; I’m really an apprentice!
Countless heat transfer experts have worked hard to calculate αo and αi, as K is merely a derivative.