초록 ▼

The present invention provides a method for calculating flow rate of a fluid using a pressure differential device, based on detected pressure and temperature upstream of and detected pressure adjacent a flow constriction of the pressure differential device, and calibration coefficients calculated fr

The present invention provides a method for calculating flow rate of a fluid using a pressure differential device, based on detected pressure and temperature upstream of and detected pressure adjacent a flow constriction of the pressure differential device, and calibration coefficients calculated from the results of a flow calibration performed on the pressure differential device. By incorporating the results of the flow calibration in the computation, a non-iterative method for obtaining mass flow rate is realized.

대표청구항 ▼

1. A method of calculating a flow rate of fluid flowing through a conduit, the method comprising the steps of:providing a flow constricting member in said conduit, said flow constricting member defining a fluid passage of a preselected flow area; flowing fluid through said flow constricting member;

1. A method of calculating a flow rate of fluid flowing through a conduit, the method comprising the steps of:providing a flow constricting member in said conduit, said flow constricting member defining a fluid passage of a preselected flow area; flowing fluid through said flow constricting member; sensing a fluid pressure P1 at a first pressure sensing location remote from said flow constricting member; sensing a fluid pressure P2 at a second pressure sensing location downstream of an entrance of said flow constricting member; and determining said mass flow rate in the absence of iteration based on detected values of said fluid pressure P1 and said fluid pressure P2, and an expression of discharge coefficient C as a function of Reynolds Number Rd determined from flow calibration data obtained from a flow calibration performed on said flow constricting member.