Abstract
A description is given of an anemometer designed to make continuous measurements of air speed in underground mining situations. Working on the hot-wire principle it consists essentially of a cylinder 5 32 in. diameter by 1 1 4 in. long which is heated electrically. A thermocouple or thermistor located inside the cylinder measures the temperature of the cylinder and another, elsewhere, that of the air. The air speed is related by calibration to the difference between the temperature of the cylinder and that of the air The anemometer is designed to operate at a temperature between 10° and 70°F above ambient, and can be used to measure air flow rates in the range 20–6000 ft/min. It gives a direct measure of the air mass flow rate, independent of the air density, temperature or humidity. The air speed can then be determined by multiplying the air mass flow rate by the specific volume of the air. An equation is derived from fundamental heat transfer considerations for calculating the performance characteristics of the anemometer under any conditions of operation. It is shown that for any particular anemometer the constants in the equation can be deduced from the physical dimensions of the anemometer and a still-air test.
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