Fluid Thermal Control with Heated Probe Feedback Isolation
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Solution Overview
Problem
Existing thermal control systems for fluids, particularly in low-volume or low-thermal-mass applications, face challenges in maintaining precise temperature control due to uncertainties in thermal resistance and the influence of temperature sensing probes on fluid temperature.
Innovation Solution
A thermal control system comprising a thermally conductive substrate in contact with a fluid, a first heating element for heating the fluid, a temperature sensing probe with a second heating element for measuring the fluid's temperature, and a feedback controller to maintain the fluid's temperature within a preselected range by adjusting the current to the heating elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensing probe is used to measure fluid temperature, then temperature measurement is achieved, but the probe itself influences the fluid temperature due to thermal mass and thermal resistance uncertainties
Solution Approach 1:
A thermally conductive substrate is introduced as an intermediary between the temperature sensing probe and the fluid. The substrate has high thermal conductivity to ensure accurate temperature measurement while being thermally isolated from the heating element. This mediator allows the probe to measure fluid temperature without the probe's thermal mass directly affecting the fluid, thus resolving the contradiction between measurement accuracy and probe influence.
Solution Approach 2:
The thermal control system is divided into separate functional components: a heating element, a thermally conductive substrate for temperature sensing, and insulation layers. This segmentation isolates the temperature measurement function from the heating function, allowing independent optimization of each component to minimize mutual interference while maintaining measurement precision.
2Loss of energy
If thermal insulation is added to reduce heat loss, then energy efficiency improves, but the system complexity increases
Solution Approach 1:
Thin film insulation layers are applied to the substrate and housing components. These thin films provide effective thermal insulation to reduce heat loss while adding minimal structural complexity and maintaining a compact device design. The insulation is integrated into the existing structure rather than adding separate complex insulation systems.
3Temperature
If feedback control is implemented to maintain precise temperature, then temperature control precision improves, but the device complexity increases due to additional sensors and control circuitry
Solution Approach 1:
A feedback control system uses the temperature sensing probe to continuously monitor fluid temperature and adjusts the heating element power accordingly through a control circuit. This closed-loop feedback maintains precise temperature control (±0.5°C or better) while using simple, integrated control circuitry rather than complex external control systems.
Solution Approach 2:
The temperature sensing probe and heating element control are merged into a single integrated control unit. The control circuit combines temperature measurement, processing, and heating control in one compact module, reducing overall device complexity while maintaining precise feedback control capability.
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 effectively maintains the fluid's temperature within a narrow range (e.g., ±0.5°C or ±0.2°C) even in low-volume or low-thermal-mass scenarios, reducing errors caused by thermal resistance uncertainties and probe influences.
Implementation Method 1
a first heating element in contact with said substrate for heating said fluid
Implementation Method 2
a temperature sensing probe configured to measure the temperature of said fluid with a second heating element for heating the probe
Implementation Method 3
a thermally conductive substrate in thermal contact with a fluid; a first heating element in contact with said substrate for heating said fluid
Implementation Method 4
a temperature sensing probe configured to measure the temperature of said fluid
Data Source
AI summary
The invention relates to a thermal control system for controlling the temperature of a fluid. In particular, the invention relates to a control system having at least two heating elements, at least one of which is used for directly or indirectly heating a fluid, and at least one of which is used for heating a thermal probe used to determine the temperature of the fluid. The heating systems are controlled by at least one feedback controller.