| Abstract | It frequently happens that vertical and horizontal traverses (e.g. total pressure traverses) are made with the measuring points chosen in a more or less arbitrary manner, without making any effort to locate them at the centres of sections of equal area. A simple arithmetic average of the pressures may then give a seriously distorted idea of the average pressure in the duct, and it is necessary, instead, to weight each pressure by the area it represents.
This note describes a method of area-averaging such a set of readings taken in an arbitrary rectangular duct, and using a Hewlett-Packard 9820-A calculator to perform the arithmetic. Clearly, any other programmable calculator or computer could be used instead, and with minor modifications, the method is equally applicable to a circular duct, or to a rectangular one in which only a single traverse is recorded. |
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