Electrocaloric element, a heat transfer system comprising an electrocaloric element and a method of making them
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Solution Overview
Problem
Vapor compression refrigerant loops pose environmental hazards and are impractical in settings lacking a ready power source, and alternative technologies like electrocaloric materials face challenges in scalability and mass production due to issues with electrode fabrication.
Innovation Solution
An electrocaloric heat transfer system is developed by modifying the surface of electrocaloric materials with electrically conductive layers, allowing for efficient heat transfer between a heat source and sink, and integrating a controller to selectively apply voltage for coordinated heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If vapor compression refrigerant loops are used for cooling applications, then effective cooling and refrigeration can be provided, but environmental hazards such as ozone depleting potential and global warming potential arise
Solution Approach 1:
The patent replaces the mechanical vapor compression system with an electrocaloric system that uses electric field-induced phase transitions in electrocaloric materials to achieve cooling. This substitution eliminates refrigerants entirely, addressing the environmental hazards while maintaining cooling functionality through a fundamentally different physical mechanism.
Solution Approach 2:
The patent changes the operating parameters from mechanical compression to electric field application. By applying electric fields to electrocaloric materials, the system induces phase transitions that produce cooling effects without requiring refrigerants, thereby eliminating environmental hazards associated with traditional vapor compression systems.
2Temperature
If vapor compression refrigerant loops are used in environments lacking ready power source, then cooling can be provided, but the power demand significantly shortens battery life or driving range
Solution Approach 1:
The patent replaces the high-power mechanical compressor with an electrocaloric system that uses low-power electric fields to induce phase transitions in materials. This substitution dramatically reduces power demand, making cooling feasible in mobile applications where battery life and driving range are critical constraints.
3Temperature
If electrocaloric materials are fabricated into electrocaloric elements with conventional electrodes, then heat transfer systems can be created, but scalability and mass production are limited due to electrode fabrication issues
Solution Approach 1:
The patent merges the electrode fabrication process with the electrocaloric material processing into a single integrated step. By forming electrodes directly during material processing rather than as a separate subsequent step, the system enables scalable manufacturing and mass production while maintaining heat transfer capability.
Solution Approach 2:
The patent performs electrode formation as a preliminary action during the material processing stage, before the electrocaloric elements are finalized and assembled into heat transfer systems. This preliminary integration of electrode fabrication simplifies subsequent manufacturing steps and enables scalable production.
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 transfers heat while minimizing environmental impact and power requirements, enabling scalable and efficient cooling solutions without the limitations of traditional refrigerant loops.
Implementation Method 1
field-active heat or electric current-responsive heat transfer systems relying on materials such as electrocaloric materials
Implementation Method 2
forming the first electrode comprises, or forming the second electrode comprises, or forming each of the first and second electrodes independently comprises modifying the respective first and/or second surface of the electrocaloric material with an electrically conductive surface modification
Implementation Method 3
thermally connecting the electrocaloric element to a heat sink along a first thermal flow path, thermally connecting the electrocaloric element to a heat source along a second thermal flow path
Data Source
Figure 1
AI summary
A method of making an electrocaloric element includes providing an electrocaloric material, forming a first electrode at a first surface of the electrocaloric material, and forming a second electrode at a second surface of the electrocaloric material. The forming of the first electrode includes, or the forming of the second electrode includes, or the forming of each of the first and second electrodes independently includes modifying the respective first and/or second surface of the electrocaloric material with an electrically conductive surface modification.