Temperature Difference: Two Fluid Transfer

The temperature difference, Δt, °F (°C), required to satisfy the basic heat transfer relationship Q = UA Δt is the logarithmic mean of the differences in temperatures at the opposite ends of the paths of flow of the two fluids. The temperature flow paths can be represented as shown in Figures 15-36 and 15-37.
image
Figure 15-32C 3/4 in. tube distribution in 1-in. triangular patttern, four-pass configuration. Rear head type L.
In true counter flow operation (sensible heat transfer), the one fluid, A, being cooled is flowing at all times in a near 180° direction to the fluid being heated, B (Figure 15-36). Note that ...

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