When a heating fluid transfers heat to a heated fluid through a wall, if the fluids are in parallel flow or counter flow it is possible to compute exactly both the transferred heat and the temperatures of the fluids via well-known equations. This holds true both for design and verification computation. However, the motion of the fluids is never in parallel flow or counter flow in heat exchangers and in tube banks. Instead, it is rather complex and consists of a combination of various cross flows. Hence, a precise design of the above components requires, on a case-by-case basis, the availability of the value of certain crucial factors or of corrective factors so as to make it possible to use the equations relative to parallel flow or counter flow. This handbook contains the introduction to the problem, its design criteria, and about 70 tables for the exact design and verification computation. It also indicates how to proceed in the case of cross flow.