HEAT TRANSFER AND HEAT EXCHANGERS B which …

8 heat TRANSFER AND heat EXCHANGERS asic concepts of heat TRANSFER are reviewed in this chapter and applied primarily to heat EXCHANGERS , which are equipment for the TRANSFER of heat B between two fluids through a separating wall. heat TRANSFER also is a key process in other specialized equipment, some of which are treated in the next and other chapters. The three recognized modes of heat TRANSFER are by conduction, convection, and radiation, and may occur simultaneously in some equipment. CONDUCTION OF heat In a solid wall such as Figure (a), the variation of temperature with time and position is represented by the one-dimensional Fourier equation For the most part, only the steady state condition will be of concern here, in which the case the partial integral of Eq.

170 HEAT TRANSFER AND HEAT EXCHANGERS TABLE 8.1. Thermal Conductivities of Some Metals Commonly Used in Heat Exchangers [kBtu/(hr)(sgft)W/ft)l Temperature ("F) Metal or Alloy -100 70 200 1000

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