Reciprocating magnetic heat pump apparatus with multiple permanent magnets in different configurations
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Solution Overview
Problem
Magnetic heat pump apparatuses do not achieve sufficiently high operation efficiency due to deviations from the Carnot cycle, particularly in the relationship between the increase/decrease rate of the magnetic field and the flow speed of the cooling fluid.
Innovation Solution
A magnetic heat pump apparatus with a magnetic refrigerating device that includes a container for magnetic working material, a magnetic-field control unit to adjust the magnetic field, and a heat-medium moving device to synchronize the heat medium's flow with the magnetic field changes, maintaining the magnetic working material in an isothermal condition by controlling the change rate of the magnetic field in accordance with the heat medium's speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the magnetic field is increased or decreased rapidly to improve heat transfer efficiency, then the operation efficiency increases, but the magnetic working material cannot maintain isothermal condition, causing deviation from ideal heat cycle
Solution Approach 1:
The patent applies dynamics by making the magnetic field change rate adjustable and synchronized with the heat medium flow speed. The magnetic field increase/decrease rate is dynamically controlled to match the heat medium's ability to absorb/release heat, ensuring the magnetic working material maintains isothermal condition during magnetization/demagnetization processes, thus resolving the contradiction between rapid heat transfer and isothermal requirement
Solution Approach 2:
The patent changes the parameter of magnetic field change rate to optimize the heat transfer process. By adjusting the magnetic field change rate according to the heat medium flow speed, the system achieves optimal heat transfer efficiency while maintaining isothermal conditions, preventing deviation from the ideal heat cycle
2Productivity
If the heat medium flow speed is increased to improve heat transfer, then the operation efficiency increases, but the magnetic field change rate must be precisely controlled, increasing system complexity
Solution Approach 1:
The patent implements feedback control by synchronizing the magnetic field change rate with the heat medium flow speed. The system monitors the heat medium flow and adjusts the magnetic field change rate accordingly, creating a closed-loop control mechanism that maintains optimal operation efficiency while managing system complexity through intelligent coordination
Solution Approach 2:
The magnetic field control unit is designed to perform multiple functions: generating the magnetic field, controlling the field change rate, and synchronizing with the heat medium flow. This multi-functionality reduces the need for separate control systems, thereby managing device complexity while maintaining high operation efficiency
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 reduces deviations from ideal heat cycles, enhancing the operation efficiency of the magnetic heat pump apparatus by optimizing heat transfer processes during isothermal excitation and degaussing processes.
Implementation Method 1
magnetocaloric element of magnetic working material is magnetically and periodically operated or released from its magnetic operation
Implementation Method 2
transfer of heat is thereby carried out
Data Source
AI summary
A magnetic heat pump cycle has a first to a fourth steps, which are repeatedly carried out. In the first step, a movement of heat medium is stopped by a pressure valve and a pressure accumulating tank and a magnetic field is applied by a magnetic-field control unit to a magnetic working material. In the second step, the pressure valve is opened so that the heat medium flows in a working chamber from a second axial end to a first axial end, and the magnetic field is increased depending on a moving speed of the heat medium. In the third step, the movement of the heat medium is stopped and the magnetic field is decreased. In the fourth step, the heat medium is moved in a reversed direction and the magnetic field is decreased depending on the moving speed of the heat medium.