Method for determining fluid mass flow rate by measurement of a temperature profile in a pipe and measuring the time of travel until the same profile is detected at a downstream point, so that calibration is not required

摘要

Method for determination of fluid mass flow velocities, in which the temperature profile in a pipe or conduit is measured at a first measurement point and the time measured until the same temperature profile occurs at a downstream measurement point. As the separation of the two points is fixed the mass flow rate can be determined. An Independent claim is made for a system for determining fluid mass flow rate using two measurement arrays for determining the temperature profile of fluid flowing in a pipe at intervals to each other, means for recording the time elapsed between a certain measured profile moving downstream from the first array to the second and calculation means for determining a corresponding mass flow rate. Typically a temperature sensor will be placed at or near the center of a pipe.