Thermowell Insert for Temperature Sensor Thermal Response
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Solution Overview
Problem
Thermowells in industrial process monitoring systems act as thermal barriers, increasing sensor response times and introducing measurement errors due to their vibration and high thermal mass, which are not effectively mitigated by existing damping fluids.
Innovation Solution
An insert with high thermal conductivity, such as silver or copper, is interposed between the thermowell and temperature sensor to improve thermal contact and protect the sensor from vibration, reducing response times and measurement errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thermowell is used to shield the temperature sensor from physical damage, then the sensor is protected from impacts and corrosion, but the thermowell acts as a thermal barrier that increases sensor response times
Solution Approach 1:
A thermal conductor insert is introduced as an intermediary component between the thermowell and temperature sensor. This insert acts as a thermal bridge that facilitates heat transfer from the thermowell to the sensor, reducing the thermal barrier effect while maintaining the protective function of the thermowell.
Solution Approach 2:
The system uses composite material configuration where the thermowell (protective outer shell) is combined with a high thermal conductivity insert (thermal conductor material). This composite structure allows simultaneous achievement of mechanical protection and efficient thermal conduction.
2Temperature
If the thermowell thermal mass is increased to improve heat conduction, then thermal conduction between the fluid and sensor is improved, but the sensor response time is further lengthened
Solution Approach 1:
Instead of uniformly increasing thermowell thermal mass throughout, the invention applies a localized thermal conductor insert only at the critical interface region where heat transfer to the sensor occurs. This localized approach improves thermal conduction efficiency at the bottleneck point without adding excessive thermal mass that would slow response time.
Solution Approach 2:
The invention changes the material parameter (thermal conductivity) of the insert rather than changing the geometric parameter (thermal mass). By using material with high thermal conductivity, efficient heat transfer is achieved without requiring large thermal mass, thus avoiding the response time penalty.
3Object-affected harmful factors
If damping fluids are used to protect against thermowell vibration, then vibration damage is reduced, but thermal conduction between the thermowell and sensor is not sufficiently improved
Solution Approach 1:
The thermal conductor insert serves as a mechanical intermediary that supports the sensor and isolates it from vibration while simultaneously serving as a thermal bridge. This dual-function intermediary addresses both vibration protection and thermal conduction needs.
Solution Approach 2:
The system combines damping fluid (for vibration protection) with a solid thermal conductor insert (for thermal conduction). This composite approach allows simultaneous achievement of vibration damping and efficient heat transfer, as the solid insert provides a direct thermal pathway that fluids cannot provide.
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 insert enhances thermal conduction and stabilizes the temperature sensor, reducing response times and measurement errors by providing a broader thermal interface and preventing mechanical impacts from vibrations.
Implementation Method 1
An insert with high thermal conductivity, such as silver or copper, is interposed between the thermowell and temperature sensor to improve thermal contact
Implementation Method 2
Some sensor assemblies have included damping fluids such as mineral oils to improve thermal conduction between thermowells and temperature sensors, and to protect alleviate thermowell vibration
Data Source
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Figure 3~4
AI summary
A temperature sensing system comprises a thermowell, a sensor, and a solid insert. The thermowell extends into a sensing region of a fluid flow. The sensor has a probe housed in the thermowell to sense a temperature in the sensing region. The solid insert is configured to removably support the probe within the thermowell and to provide a thermal contact between the thermowell and the probe.