Medium temperature calculation method for external clamping type flow sensor

By constructing a multi-parameter coupled temperature calculation method, and combining thermodynamic and fluid mechanics principles, the problem of converting pipe wall temperature to the actual medium temperature in clamp-on flow sensors was solved, achieving high-precision calculation of medium temperature and improving the reliability of flow measurement.

CN121740179APending Publication Date: 2026-03-27GAOFENG FLUID CONTROL (CHAOYANG) CO LTD
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Patent Information

Application Number
CN202512037616.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-31
Publication Date
2026-03-27

AI Technical Summary

Technical Problem

Existing clamp-on flow sensors lack an accurate calculation method to convert pipe wall temperature into the true temperature of the medium inside the pipe, resulting in insufficient flow measurement accuracy. Existing temperature correction schemes fail to effectively consider the influence of multiple factors.

Method used

Based on the thermodynamic laws of heat conduction and fluid mechanics principles, a multi-parameter coupled temperature calculation method is constructed. By combining the pipe wall temperature and auxiliary parameters with the steady-state thermal balance equation and iterative correction, the true temperature of the medium is derived. Furthermore, a multi-dimensional correction mechanism and filtering technology are introduced to reduce noise interference and improve calculation accuracy.

Benefits of technology

It achieves high-precision calculation of medium temperature, reduces single-point measurement error, improves the reliability and robustness of flow measurement, adapts to complex fluid transportation scenarios, and meets the requirements of high-precision flow measurement.

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Abstract

The invention discloses an external clamping type flow sensor medium temperature calculation method, and relates to the technical field of testing and metering, and the method comprises the steps: obtaining the outer wall temperature measurement values of two sensors through a temperature collection device; by means of double-temperature-probe averaging treatment, accidental errors of single-point measurement are effectively reduced, three heat transfer mechanisms of heat transfer, solid heat conduction and convection-radiation combined heat dissipation are constructed, a fluid dynamic criterion is introduced to accurately calculate a convection heat transfer coefficient, quantitative heat transfer models outside and inside the tube are constructed, and the heat transfer efficiency is improved. By introducing an empirical formula dynamically coupled with the environment wind speed and a fluid mechanics criterion correlation formula based on the Reynolds number criterion, scene self-adaption accurate calculation of the key heat exchange coefficient is achieved, iterative correction of fluid physical property parameters is combined, and through iterative calculation and real-time correction of the physical property parameters, the real-time correction of the fluid physical property parameters is achieved. A three-layer progressive error correction system of dynamic time correction, scene database correction and multi-dimensional anti-interference correction is established, and high precision and high reliability of temperature calculation are achieved.
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