Method and apparatus for measuring the calorific value of a gas
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United States of America Patent
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Sep 3, 2002
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app pub date -
Aug 29, 2000
filing date -
Jan 16, 1998
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Abstract
A method and apparatus for measuring the calorific value of a gas. The apparatus includes a chamber to which a gas in question, for example natural gas, is supplied through an inlet and leaves through an outlet. The speed of sound SoS at ambient temperature is measured using any suitable method such as electronic control and a calculating device and an ultra-sound emitter and an ultra-sound receiver. The ambient temperatures T.sub.a, is observed by a temperature sensor, and a thermal conductivity sensor measures the thermal conductivity of the gas at two different temperatures above the ambient temperature. One value ThC.sub.H, of the thermal conductivity is measured at 70.degree. C. above ambient and the other value ThC.sub.L of the thermal conductivity is measured at 50.degree. C. above ambient. The control calculates the calorific value CV of the gas according to the formula: CV=a.multidot.ThC.sub.H +b.multidot.ThC.sub.L +C.multidot.SoS+d.multidot.T.sub.a +e.multidot.T.sub.a.sup.2 +f, where a, b, c, d, e and f are constants.
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