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By Lienhard J.H.

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1) that if k varies linearly with T , and if heat transfer is plane and steady, then q = k∆T /L, with k evaluated at the average temperature in the plane. If heat transfer is not planar or if k is not simply A + BT , it can be much more difficult to specify a single accurate effective value of k. If ∆T is not large, one can still make a reasonably accurate approximation using a constant average value of k. 3 The temperature dependence of the thermal conductivity of liquids and gases that are either saturated or at 1 atm pressure.

1 The heat diffusion equation Objective We must now develop some ideas that will be needed for the design of heat exchangers. The most important of these is the notion of an overall heat transfer coefficient. This is a measure of the general resistance of a heat exchanger to the flow of heat, and usually it must be built up from analyses of component resistances. In particular, we must know how to predict h and how to evaluate the conductive resistance of bodies more complicated than plane passive walls.

Cherry, H. A. Johnson, and R. C. Martinelli. Heat Transfer Notes. McGraw-Hill Book Company, New York, 1965. Originally issued as class notes at the University of California at Berkeley between 1932 and 1941. 3] M. Jakob. Heat Transfer. John Wiley & Sons, New York, 1949. 4] W. H. McAdams. Heat Transmission. McGraw-Hill Book Company, New York, 3rd edition, 1954. 5] W. M. Rohsenow and H. Y. Choi. Heat, Mass and Momentum Transfer. , 1961. 6] E. R. G. Eckert and R. M. Drake, Jr. Analysis of Heat and Mass Transfer.

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