Published online by Cambridge University Press: 24 October 2008
1. The cross-flow type of heat interchanger is shown diagrammatically in Fig. 1. One of the fluids involved is arranged to pass through a nest of small tubes, while the other streams past the tubes at right angles to them. To fix ideas we suppose that the tubes contain cooling water which enters at a temperature T1. The temperature of the water leaving a tube depends upon its position, but the water from all the tubes is mixed and is led to a single exit pipe in which the temperature is T2. In the same way the fluid to be cooled enters at a temperature t1 and leaves at a temperature t2. If the cooling water is not used again by being led through another nest of tubes also exposed to the fluid to be cooled, the arrangement is termed a single-pass heat interchanger.
* Smith, D. M., “Mean Temperature Difference in Cross-Flow”, Fourth International Congress on Applied Mechanics, 1934Google Scholar; and Engineering, 138 (1934), 479.Google Scholar
† “Some factors in the design of surface condensing plant,” Proc. Inst. Mech. Eng. 126 (1934), 227.Google Scholar
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* Numerical values of I n(x) = i −nJ n(ix) are given in Jahnke, und Emde, Funktionentafeln, 2nd ed. (Teubner, 1933), pp. 282–3.Google Scholar