초록 ▼

The flowrate of a compressible gs is determined by measuring the pressure and temperature on each side of a flow impedance device, such as an orifice plate and computing the flowrate from the resulting pressure and temperature differentials according to a newly discovered orifice equation disclosed

The flowrate of a compressible gs is determined by measuring the pressure and temperature on each side of a flow impedance device, such as an orifice plate and computing the flowrate from the resulting pressure and temperature differentials according to a newly discovered orifice equation disclosed herein. The flowrate determined in accordance with the invention is more accurate than that calculated by using the standard orifice equation, which ignores the temperature differential. In addition, the calculation is independent of the type of flow impedance used and is not affected by degradation of the impedance device, such as the erosion of the orifice in orifice plates.

대표청구항 ▼

Apparatus for determining the flowrate of a stream of compressible fluid, comprising: a conduit for carrying the fluid; a plate in said conduit having orifice therein, whereby the fluid flow may be impeded to create pressure and temperature differential thereacross; a first pressure sensor in said c

Apparatus for determining the flowrate of a stream of compressible fluid, comprising: a conduit for carrying the fluid; a plate in said conduit having orifice therein, whereby the fluid flow may be impeded to create pressure and temperature differential thereacross; a first pressure sensor in said conduit on the upstream side of the plate; a second pressure sensor in said conduit on the downstream side of said plate; a first temperature sensor in said conduit on said upstream side of said plate; a second temperature sensor in said conduit on said downstream side of said plate; and means in communication with said first and second temperature sensors for computing the flowrate of said stream of fluid in accordance with the following formula: [Figure] (15) [Figure] where P means Pressure T means Temperature R means Gas Constant Z means Compressibility Factor D means Diameter M means Molar Mass m means Mass Flowrate Cpid means Ideal Gas Specific Heat per Mole y1 and 2, and of the geometry also at points 1 and 2) gc means Mass/Force Conversion Factor.