Multi-Material Blade Design for Magneto-Caloric Regenerative Engines
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Solution Overview
Problem
Existing active magnetic regenerative (AMR) and electro-caloric regenerative (AER) heat engines face limitations in operating speed, packing density, pressure drops, and cooling power due to the use of powdered bed structures, which result in high costs and large sizes, and require optimization of material selection and geometries to enhance performance and efficiency.
Innovation Solution
A Multi-Material-Blade design for active regenerative magneto-caloric or electro-caloric engines, featuring a blade body divided into elements made from different materials with varying Curie temperatures and porosities, and dedicated channels to maximize packing density, reduce losses, and enhance magnetic field utilization, utilizing materials like LaFeSi and P(VDF-TrFE-chlorofluoroethylene with optimized geometries and spacers to minimize heat exchange and viscous losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If powdered bed structures are used in AMR/AER heat engines, then the regenerative effect is achieved, but the operating speed is limited and pressure drops increase
Solution Approach 1:
The patent applies porous materials with optimized pore size and distribution to create dedicated channels for exchange fluid flow. This allows the regenerative effect to be maintained while reducing pressure drops and enabling higher operating speeds by providing defined flow paths that minimize resistance.
Solution Approach 2:
The patent changes the structural parameters of the regenerative material from a traditional powdered bed to a controlled porous structure with specific porosity values (e.g., 30-70%). This parameter optimization resolves the contradiction by maintaining regenerative effectiveness while improving fluid flow characteristics for higher speed operation.
2Productivity
If powdered bed structures are used, then the regenerative cycle is implemented, but the device size and cost increase
Solution Approach 1:
The patent uses composite structures combining regenerative materials with spacer materials to create a multi-functional blade design. This composite approach increases cooling power through enhanced heat exchange surfaces while maintaining compact device size by integrating multiple functions into a single blade component.
Solution Approach 2:
The patent transitions from a one-dimensional powdered bed to a three-dimensional blade structure with internal channels. This dimensional change allows for increased cooling power through distributed heat exchange throughout the blade volume while maintaining a compact overall device footprint.
3Temperature
If single-material blades are used, then the structure is simple, but the temperature gradient coverage is limited
Solution Approach 1:
The patent applies local quality by dividing the blade into multiple elements with different materials optimized for specific temperature ranges. Each element's material composition is tailored to its local thermal environment, enabling comprehensive temperature gradient coverage while keeping each individual element relatively simple in structure.
Solution Approach 2:
The patent segments the blade into multiple elements made from different magneto-caloric or electro-caloric materials, each optimized for specific temperature ranges. This segmentation allows the overall blade to cover a broad temperature gradient while maintaining manageable complexity through modular design and standardized interfaces between elements.
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 Multi-Material-Blade design significantly increases temperature gradients, cooling capacity, and efficiency by optimizing material selection and geometry, reducing losses and costs, and enabling compact, high-performance regenerative engines for cooling, heat pumping, and energy recovery applications.
Implementation Method 1
Magneto-caloric materials exhibit the magneto-caloric effect (MCE), which is the change in temperature upon the application or removal of a magnetic field
Implementation Method 2
Electro-caloric materials exhibit the electro-caloric effect (ECE), which is the change in temperature upon the application or removal of an electric field
Implementation Method 3
The characteristic temperature at which the transition associated with the entropy change occurs is known as the Curie temperature (Tc)
Data Source
AI summary
The present invention describes the design and fabrication of Multi-Material-Blades used as active regenerative regenerators in active regenerative magneto-caloric or electro-caloric engines. The blades consist of a plurality of elements (2) that divide the blade body along its length. Each element (2) is made of a different magneto-caloric or electro-caloric material selected appropriately, and a plurality of dedicated channels (3) penetrates the blade body (1) and extends along the length of the blade. The dedicated channels (3) can be provided with fluid mixing structures, porous layers or hydrophobic coatings to reduce the HE loss in an active regenerative engine. The Multi-Material-Blades are obtainable by ink jet printing techniques to reduce costs. The Multi-Material-Blades can further have a curved shape to form an involute blade body (1). All measures can improve the performance of active regenerative magneto-caloric or electro-caloric engines, and lay the basis for commercial solutions.