Electrocaloric Heat Pump with Self-Synchronized Thermal Cycling
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Solution Overview
Problem
Historically, electrocaloric materials have shown limited practical applications due to small temperature changes for large electric fields, restricting their use in heat transfer devices like electrocaloric heat pumps and coolers.
Innovation Solution
A system and method utilizing an electrocaloric structure suspended between a thermal energy source and sink, controlled by a single self-synchronizing control signal for temperature and movement, allowing for efficient heat transfer by alternating physical movement and temperature control, leveraging materials like P(VDF-TrFE) and PZT for enhanced electrocaloric effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If electrocaloric materials are used for heat transfer, then temperature control capability is provided, but the temperature change is relatively small for large electric fields
Solution Approach 1:
The patent applies parameter changes by utilizing materials with specific electrocaloric properties (P(VDF-TrFE) polymers and PZT ceramics) that exhibit larger temperature changes for given electric fields compared to traditional materials. This changes the material parameter to improve the temperature control efficiency.
Solution Approach 2:
The system employs periodic alternation between thermal communication with the heat source and heat sink, synchronized with periodic application of electric fields. This periodic action enables continuous heat transfer cycles, converting the limited temperature change into effective periodic heat pumping action.
2Ease of operation
If separate control signals are used for temperature control and movement control, then independent control is achieved, but device complexity increases
Solution Approach 1:
The patent merges the temperature control signal and movement control signal into a single unified control signal that simultaneously controls both the electrocaloric material's temperature and the mechanical movement of the structure. This combining reduces the number of independent control systems while maintaining coordinated operation through the inherent coupling of the electrocaloric effect.
Solution Approach 2:
The single control signal source provides multi-functionality by generating control signals that serve dual purposes: controlling the electrocaloric temperature response and coordinating the mechanical movement between heat source and heat sink positions. This universal control approach simplifies the overall system architecture.
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 enables controlled and efficient heat transfer, allowing for both heating and cooling by synchronizing temperature and movement of the electrocaloric structure, enhancing the thermal efficiency and practicality of electrocaloric heat pumps and coolers.
Implementation Method 1
the electrocaloric effect is the ability of certain materials to increase or decrease in temperature when exposed to an applied electric field
Data Source
AI summary
System and methods are disclosed for controlled thermal energy transfer. The system includes a thermal energy source, a thermal energy sink, spaced apart from the thermal energy source, an electrocaloric structure carried by a suspension and configured for alternating physical movement between thermal communication with the thermal energy source and thermal communication with the thermal energy sink, and a control signal source simultaneously providing both a temperature control signal for controlling the temperature of the electrocaloric structure and a movement control signal for controlling the alternating physical movement of the electrocaloric structure between thermal communication with the thermal energy source and thermal communication with the heat sink. Heating or cooling of a desired element may be provided. Movement control may be electrostatic, magnetic, mechanical, etc., and is self-synchronizing with the field employed for temperature control in the electrocaloric structure.