Virtual Density Measurement in Flowing Media
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Solution Overview
Problem
Industrial measuring systems for flowing media face significant measurement errors, especially in determining density, due to spatial variance in the Reynolds number and thermodynamic state, leading to inaccuracies in calculated mass and volume flow rates.
Innovation Solution
A measuring system that includes temperature and pressure sensors, along with measuring electronics, which account for spatial variance by using stored system parameters and compensation factors to calculate a virtual density measurement, improving accuracy by referencing a defined reference point and considering local flow velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If discrete measuring devices are used to measure density, pressure and temperature at different locations, then the measurement coverage is improved, but measurement errors increase due to spatial variance in Reynolds number and thermodynamic state
Solution Approach 1:
The system divides the process line into multiple measurement sections, placing discrete measuring devices (temperature sensor, pressure sensor, flow sensor) at different locations along the flow axis. This segmentation allows measurement of thermodynamic state variables at multiple points, enabling calculation of density at a virtual reference point while accounting for spatial variations through compensation factors.
Solution Approach 2:
The patent introduces compensation factors as intermediary elements that mediate between the measured values at different locations and the desired density value at the virtual reference point. These compensation factors account for the spatial variance in Reynolds number and thermodynamic state, transforming raw measurements into accurate density calculations despite the distributed measurement approach.
2Adaptability or versatility
If a virtual density measurement is calculated from pressure and temperature sensors, then measurement flexibility is improved, but measurement precision deteriorates due to spatial variance in thermodynamic state
Solution Approach 1:
The system changes the parameters used in density calculation by introducing compensation factors that adjust for spatial variance in thermodynamic state. Instead of using fixed standard equations, the system dynamically modifies calculation parameters based on measured temperature, pressure, and flow velocity at different locations, thereby maintaining high precision while preserving measurement flexibility.
Solution Approach 2:
The measuring system incorporates feedback mechanisms where the flow sensor measures actual flow velocity, and this information is fed back to the measuring electronics to calculate appropriate compensation factors. This feedback loop continuously adjusts the density calculation based on actual process conditions, ensuring high precision despite the virtual measurement approach.
3Area of stationary object
If multiple discrete sensors are installed along the process line, then spatial coverage is improved, but device complexity increases
Solution Approach 1:
The measuring electronics serve multiple functions: they process signals from temperature sensors, pressure sensors, and flow sensors; calculate compensation factors; determine density at the virtual reference point; and provide output signals. This multi-functionality reduces the need for separate dedicated processing devices, thereby limiting the increase in system complexity despite the distributed sensor arrangement.
Solution Approach 2:
The patent merges the processing functions for multiple measurement types into a single measuring electronics unit. By combining the evaluation of temperature, pressure, and flow measurements, along with the calculation of compensation factors and density values, the system reduces the number of separate components while maintaining comprehensive spatial coverage through the distributed sensor network.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system significantly enhances measurement accuracy by compensating for spatial variances in the Reynolds number and thermodynamic state, reducing errors and improving the precision of density and flow rate calculations.
Implementation Method 1
at least one temperature sensor placed at a temperature measuring point, reacting primarily to a local temperature, Θ, of medium flowing past
Implementation Method 2
at least one pressure sensor placed at a pressure measuring point, reacting primarily to a local pressure, p, especially a static pressure, of medium flowing past
Data Source
AI summary
A measuring system for the precise measuring a density of a medium, flowing in a line. compressible. The measuring system comprises: a temperature sensor and a pressure sensor. Both sensors communicate with a measuring electronics of the system.The measuring electronics are operable to provide, based on temperature measurement and pressure measurement signal, density measured-value representing, instantaneously, a local density, of the flowing medium at a virtual density measuring point, predeterminably spaced from the pressure measuring point and/or from the temperature measuring point, along the flow axis.