Conduction-Based Magneto Caloric Heat Pump with Staged MCM Assemblies
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Solution Overview
Problem
Conventional heat pump systems using fluid refrigerants face inefficiencies, environmental concerns, and operational limitations across varying ambient temperatures, while magneto caloric materials offer higher theoretical efficiency but require practical and cost-effective equipment for continuous heat transfer.
Innovation Solution
A heat pump system utilizing multiple stages of magneto caloric materials with alternating normal and inverse types, integrated with thermal blocks to prevent reverse heat transfer and a magnetic element for cycling magnetic flux, allowing efficient heat transfer across a wide temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If magneto caloric materials are used to achieve higher Carnot cycle efficiency, then theoretical efficiency is improved, but practical equipment complexity and cost increase
Solution Approach 1:
The heat pump system is divided into multiple discrete stages, each containing magneto caloric material assemblies with specific Curie temperatures. Each stage operates independently with its own thermal blocks and magnetic flux cycling, allowing the complex MCM technology to be implemented in manageable, modular units that can be sequentially arranged to achieve broad temperature range heat transfer.
Solution Approach 2:
The system utilizes magneto caloric materials with different Curie temperatures for different stages, allowing each material to operate at optimal temperatures. The magnetic flux density and cycling frequency are also varied across stages to match the thermal characteristics of each MCM assembly, optimizing efficiency while managing complexity through parameter differentiation.
2Loss of energy
If thermal blocks are added to prevent reverse heat transfer, then heat transfer efficiency is improved, but device complexity increases
Solution Approach 1:
Thermal blocks with high thermal conductivity are strategically positioned only at specific locations where reverse heat transfer would occur - specifically between stages and at the heat receiving and transmitting ends. This localized application of thermal management components prevents unnecessary heat leakage while avoiding the complexity of insulating the entire system.
3Adaptability or versatility
If multiple stages with different Curie temperatures are used to cover broad temperature range, then adaptability is improved, but device complexity increases
Solution Approach 1:
The heat pump is segmented into multiple stages, with each stage containing MCM assemblies having progressively different Curie temperatures. This segmentation allows the system to cover a broad temperature range by activating appropriate stages based on the required temperature differential, while maintaining manageable complexity through modular design.
Solution Approach 2:
Each stage is designed with universal components including thermal blocks, MCM assemblies, and magnetic flux cycling mechanisms that can handle various temperature conditions. The modular stage design allows the same basic configuration to be replicated across multiple temperature ranges, reducing overall system complexity while achieving broad adaptability.
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 achieves efficient and continuous heat transfer across a broad temperature range, enhancing the theoretical Carnot cycle efficiency and addressing the limitations of conventional systems, making it suitable for applications like refrigeration appliances.
Implementation Method 1
the magnetic moments of a 'normal' MCM will become more ordered under an increasing, externally applied magnetic field and cause the MCM to generate heat. Conversely, decreasing the externally applied magnetic field will allow the magnetic moments of the normal MCM to become more disordered and allow the normal MCM to absorb heat
Implementation Method 2
Each thermal block is configured to preclude the transfer of heat in a direction from the heat transmitting end towards the heat receiving end
Implementation Method 3
A magnetic element is configured to cycle a changing field of magnetic flux along the plurality of stages
Data Source
AI summary
A heat pump is provided that uses multiple stages of MCMs to cause heat transfer between a heat receiving end and a heat transmitting end. Thermal blocks are placed along the direction of heat transfer at locations in the heat pump that preclude the transfer of heat in a direction from the heat transmitting end towards the heat receiving end. The heat pump can be, for example, part of a refrigeration loop or can be connected directly with the object for which heating or cooling is desired. An appliance incorporating such a heat pump is also provided.