Pipe Fluid Temperature Measurement Using Outer Wall Kalman Estimation
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Solution Overview
Problem
Existing temperature measurement devices for fluid inside pipes disrupt the internal working conditions, are limited in measuring range, and cannot perform continuous measurements, especially when the internal temperature is high or the structure cannot be modified.
Innovation Solution
A method and system using a Kalman filtering principle to determine fixed and process parameters, acquire outer wall and air temperatures, and calculate optimal internal pipe temperatures based on these parameters, enabling real-time temperature measurement inside pipes without disrupting the internal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature measuring device is penetrated into the pipe to measure internal fluid temperature, then the temperature measurement capability is improved, but the local resistance to fluid flow increases and the original working condition is destroyed
Solution Approach 1:
The patent uses the pipe wall as an intermediary medium to transfer thermal information from the internal fluid to external sensors. By measuring the outer wall temperature and using heat transfer models (including thermal conductivity, convective heat transfer coefficients, and flow rate parameters), the system infers the internal fluid temperature without direct contact, thus avoiding flow disruption while maintaining measurement capability
Solution Approach 2:
The patent replaces the mechanical penetration approach with a non-contact thermal field measurement method. Instead of physically inserting a thermometer into the fluid flow, the system uses thermal conduction through the pipe wall combined with Kalman filtering algorithms to calculate internal temperature from external measurements, substituting mechanical intrusion with thermal field analysis
2Measurement precision
If multiple temperature measuring devices are added to achieve continuous temperature measurement at multiple points, then the measurement coverage is improved, but the device complexity and cost increase
Solution Approach 1:
The patent makes a single external temperature sensor serve multiple measurement points along the pipe by utilizing the pipe wall as a universal thermal conduction path. The Kalman filtering system processes measurements from one location to infer temperatures at multiple positions by incorporating flow rate and thermal conductivity parameters, allowing one sensor to perform what would traditionally require multiple sensors
Solution Approach 2:
The patent creates a virtual model of the internal temperature distribution based on external wall temperature measurements and heat transfer equations. By copying the thermal field information from the accessible outer surface to the inaccessible inner fluid through mathematical modeling, the system achieves continuous temperature profiling without physically placing sensors throughout the fluid path
3Stability of the object's composition
If the internal working condition structure is built and sealed, then the working condition stability is improved, but the ability to measure internal working medium temperature is lost
Solution Approach 1:
The patent uses the sealed pipe wall structure as a thermal intermediary that maintains structural integrity while transmitting temperature information. The intact pipe serves as both a protective barrier and a thermal conduction path, allowing external sensors to measure internal fluid temperature through the wall without compromising the sealed working environment
Solution Approach 2:
The patent changes the measurement parameter from direct contact temperature sensing to indirect thermal field analysis. By measuring outer wall temperature and using heat transfer parameters (thermal conductivity, convective coefficients, flow rate) in Kalman filtering calculations, the system obtains internal temperature information while maintaining the sealed structure unchanged
4Measurement precision
If a temperature measuring device is inserted into high-temperature internal fuel, then the temperature measurement is achieved, but the device penetration becomes difficult and measurement is restricted
Solution Approach 1:
The patent uses the pipe wall as a thermal intermediary that isolates external sensors from direct exposure to high-temperature fuel. The wall acts as a protective barrier that conducts temperature information from the high-temperature internal fuel to external measurement points, making high-temperature measurement feasible without exposing sensors to extreme conditions
Solution Approach 2:
The patent replaces the mechanically intrusive high-temperature sensor insertion with a non-contact thermal field measurement approach. By measuring outer wall temperature and using heat transfer models to calculate internal fuel temperature, the system avoids the engineering challenges of penetrating and protecting measurement devices in high-temperature environments
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
Enables real-time measurement of internal pipe temperatures by utilizing outer wall measurements, addressing the limitations of existing methods and expanding the application range of temperature measurement in pipes.
Implementation Method 1
a thermal conductivity of a wall material of the pipe
Implementation Method 2
a convective heat transfer coefficient of the fluid
Data Source
AI summary
A method and a system for temperature measurement of fluid in a pipe, an electronic device and a storage medium are provided, and relates to the technical field of temperature measurement in a pipe. The method includes: determining fixed parameters of an object to be measured, a flow rate of the fluid, a noise variance and an observation variance; determining a predicted temperature at a current moment according to an optimal internal pipe temperature and a flow rate of the fluid at a previous moment; determining a covariance at the current moment according to the noise variance and an optimal covariance at the previous moment; determining a weight coefficient at the current moment; and determining an optimal internal pipe temperature at the current moment, thereby expanding the application range of temperature measurement in a pipe.