Electrocaloric Cooling with Electrostatic Actuation for High COP
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Solution Overview
Problem
Current solid-state cooling technologies based on the electrocaloric effect face challenges in achieving high specific cooling power and coefficient of performance (COP) due to the need for physical transportation of electrocaloric materials between heat sources and sinks, which increases system complexity and reduces efficiency.
Innovation Solution
A solid-state heat transporting device utilizing a flexible electrocaloric polymer film coupled with an electrostatic actuation mechanism, allowing for controlled heat transfer between heat sources and sinks by altering the shape or position of the film to enhance thermal contact and reduce parasitic power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electrocaloric materials are physically transported between heat sink and heat source using electric motor and transmission, then heat transport function is achieved, but system size and complexity increase and COP decreases
Solution Approach 1:
The patent replaces the mechanical transport system (electric motor and transmission) with an electrostatic actuation system. The electrocaloric material is directly actuated by electrostatic forces to move between heat sink and heat source, eliminating the need for mechanical transmission components and reducing system complexity while maintaining the heat transport function.
Solution Approach 2:
The patent extracts and removes the mechanical transmission components (motor, transmission) from the system, retaining only the essential electrostatic actuation mechanism. This simplification reduces system complexity and improves COP while still achieving the required heat transport functionality through direct electrostatic actuation of the electrocaloric material.
2Ease of operation
If electrocaloric materials are physically transported between heat sink and heat source, then heat transport function is achieved, but system size increases
Solution Approach 1:
The patent replaces bulky mechanical transport components with a compact electrostatic actuation system. The electrocaloric material is directly actuated by electrostatic forces, eliminating the need for large motors and transmission mechanisms, thereby significantly reducing the overall system size while maintaining effective heat transport functionality.
3Ease of operation
If mechanical compressors are used in vapor-compression refrigeration systems, then cooling function is achieved, but system becomes bulky and complex
Solution Approach 1:
The patent replaces the mechanical compressor system with an electrostatic actuation system that directly moves the electrocaloric material. This substitution eliminates complex mechanical components including compressors, refrigerants, and associated machinery, resulting in a simplified solid-state cooling system that achieves the same cooling function through electrostatic field modulation.
4Manufacturing precision
If electrostatic actuation is used to control thermal contact of heat transporting element, then thermal contact uniformity is improved, but energy consumption increases
Solution Approach 1:
The patent modulates the electrostatic field parameters (voltage, frequency, duty cycle) to optimize the balance between thermal contact uniformity and energy consumption. By dynamically adjusting these parameters, the system achieves improved thermal contact uniformity while minimizing parasitic power consumption, rather than operating at fixed high energy levels.
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 device achieves a specific cooling power of 2.8 W/g and a COP of 13, surpassing existing solid-state cooling technologies, with a compact and flexible form factor suitable for various applications, including mobile and wearable devices.
Implementation Method 1
The heat transporting element uses the electrocaloric effect to absorb and release the heat
Implementation Method 2
the uniformity of contact is controlled using an electrostatic effect which may change the shape or position of the heat transporting element
Data Source
AI summary
A solid-state heat transporting device including a heat transporting element whose uniformity of contact with one or multiple surfaces is controllable so that various amounts of heat may be transported to and from the one or multiple surfaces. The heat transporting element uses the electrocaloric effect to absorb and release the heat and the uniformity of contact is controlled using an electrostatic effect which may change the shape of the heat transporting element. In one embodiment, the heat transporting element is an electrostatically actuated P(VDF-TrFE-CFE) polymer stack achieving a high specific cooling power of 2.8 W/g and a COP of 13 (the highest reported coefficient of performance to date) when used as a cooling device.