Thermostatic Valve Feedback Control for Accurate Heat Exchanger Regulation
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Solution Overview
Problem
Thermostatic expansion valves in heat exchangers face accuracy issues due to production tolerances and require frequent battery replacements in electronic thermostatic regulating valves, leading to inefficient temperature control.
Innovation Solution
A method and system that adjust the position of the thermostatic element or change the distance between the thermostatic element and the valve closing member based on temperature deviations, using a motor powered by low-energy sources like Seebeck generators, to compensate for long-term temperature fluctuations, thereby reducing energy consumption and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a thermostatic expansion valve is used for temperature control, then the valve responds automatically to temperature changes, but the accuracy is reduced due to production tolerances and manufacturing deviations
Solution Approach 1:
The patent implements a feedback mechanism where a control unit continuously monitors the actual temperature and compares it with the desired temperature. Based on this feedback, the system automatically adjusts the thermostatic element's position or the distance between the thermostatic element and valve closing member to compensate for deviations caused by manufacturing tolerances, thereby improving temperature control accuracy while maintaining automatic operation
Solution Approach 2:
The patent changes the parameters of the thermostatic system by allowing dynamic adjustment of the thermostatic element's position or the gap distance between the thermostatic element and valve closing member. This parameter adjustment is controlled based on measured temperature deviations, enabling the system to compensate for fixed manufacturing tolerances and achieve more accurate temperature control
2Measurement precision
If an electronic thermostatic regulating valve (eTRV) is used for precise temperature control, then the temperature accuracy is improved, but the battery requires frequent replacement due to continuous motor operation
Solution Approach 1:
The patent employs periodic action by using the thermostatic element's natural thermal expansion and contraction to drive the valve opening and closing movements, rather than continuous motor operation. The control unit only needs to periodically adjust the thermostatic element's baseline position or gap distance based on temperature feedback, significantly reducing energy consumption and extending battery life while maintaining accurate temperature control
Solution Approach 2:
The patent enables self-service by allowing the thermostatic element to automatically perform the work of opening and closing the valve through its thermal response to temperature changes. The control unit merely provides periodic positional adjustments to compensate for drift, eliminating the need for continuous motor actuation and thereby dramatically reducing power consumption and battery replacement frequency
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
This approach enhances the accuracy of temperature regulation in heat exchangers by compensating for manufacturing tolerances and environmental disturbances with low energy consumption, reducing the need for frequent battery replacements and improving long-term temperature control.
Implementation Method 1
a motor powered by low-energy sources like Seebeck generators
Implementation Method 2
A portion of the thermostatic element becomes longer when its temperature increases and shorter when its temperature decreases
Data Source
Figure 1~2
Figure 3~4
Figure 5a
AI summary
A method of regulating a thermostatic valve in a heat exchanger to obtain a desired temperature. The desired temperature is translated into a corresponding position of the thermostatic element. The thermostatic element and the connected valve closing member are moved and/or changing the distance between the thermostatic element and the connected valve closing member is changed based on said corresponding position, such that the position of the valve closing member is adjusted and the temperature is approached. Any deviation between desired temperature value and measured temperature values are compensated for in order to reduce future temperature deviation.