Magnetocaloric Generator Bypass Circuit for Thermal Gradient Protection
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Solution Overview
Problem
Magnetocaloric thermal generators face inefficiencies in thermal energy exchange, particularly when the cold side is exploited, leading to degradation of thermal efficiency due to significant temperature differences with external applications, resulting in wasted power.
Innovation Solution
The magnetocaloric thermal generator design includes a primary circuit with branch pipes allowing unidirectional fluid flow from an exit point to an injection point, optimizing thermal energy transfer between the generator and external applications, with heat exchange zones configured for counter-current, co-current, or cross-current movements between primary and secondary fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If heat exchange with external applications having significant temperature difference is performed at the cold side, then thermal energy exchange capability is improved, but thermal gradient is degraded and thermal efficiency is reduced
Solution Approach 1:
The primary circuit is segmented into multiple independent loops, each loop containing magnetocaloric elements and heat exchange zones. This segmentation allows different loops to operate at different thermal conditions simultaneously, enabling heat exchange with external applications without compromising the thermal gradient in other loops.
Solution Approach 2:
Different regions of the system are assigned different thermal characteristics. The heat exchange zones are locally optimized for thermal interaction with external applications, while the magnetocaloric element regions maintain optimal thermal gradients for efficient magnetocaloric cycling. This local differentiation allows simultaneous optimization of both heat exchange capability and thermal efficiency.
2Productivity
If heat exchange with external applications is performed at the hot side, then thermal energy exchange capability is improved, but thermal gradient is degraded and thermal efficiency is reduced
Solution Approach 1:
The primary circuit is segmented into multiple independent loops, each loop containing magnetocaloric elements and heat exchange zones. This segmentation allows different loops to operate at different thermal conditions simultaneously, enabling heat exchange with external applications without compromising the thermal gradient in other loops.
Solution Approach 2:
Different regions of the system are assigned different thermal characteristics. The heat exchange zones are locally optimized for thermal interaction with external applications, while the magnetocaloric element regions maintain optimal thermal gradients for efficient magnetocaloric cycling. This local differentiation allows simultaneous optimization of both heat exchange capability and thermal efficiency.
3Device complexity
If conventional symmetric interconnection of magnetocaloric elements is used, then structural simplicity is maintained, but thermal efficiency is degraded when cold side or hot side is exploited
Solution Approach 1:
The system transitions from symmetric interconnection to asymmetric configuration where heat exchange zones are positioned and configured differently from magnetocaloric element zones. This asymmetry allows optimized thermal pathways for heat exchange while preserving thermal gradients in the magnetocaloric regions, resolving the conflict between structural simplicity and thermal efficiency.
Solution Approach 2:
The primary circuit is segmented into multiple independent loops, each loop containing magnetocaloric elements and heat exchange zones. This segmentation allows different loops to operate at different thermal conditions simultaneously, enabling heat exchange with external applications without compromising the thermal gradient in other loops.
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 design minimizes the impact on the thermal gradient within the generator, allowing for efficient exploitation of thermal power and maintaining high thermal efficiency during both cooling and heating processes.
Implementation Method 1
These thermal generators exploit the magnetocaloric effect (EMC) of certain materials, which consists of a variation in their temperature when they are subjected to a variable magnetic field
Implementation Method 2
a heat exchange with a heat transfer fluid called primary fluid is carried out to thus collect the thermal energy produced by said materials
Implementation Method 3
the circulation of the primary fluid is alternated and this primary fluid circulates in channels or pores passing through the magnetocaloric material
Implementation Method 4
These external applications can be the surrounding air, the thermal generator, a device or a thermal enclosure, for example
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
The invention relates to a magnetocaloric thermal generator (10) comprising a primary circuit (P10) fluidically connecting two stages (E1, E2) of magnetocaloric elements (M11, M12, M21, M22) using a heat-transfer fluid referred to as primary fluid flowing alternately back and forth, said stages (E1, E2) being subjected to the variable magnetic field of a magnetic system (2), and the primary circuit comprising a cold side (F) and a hot side (C) at which the magnetocaloric elements (M11, M12, M21, M22) of said stages (E1, E2) are fluidically connected. At least the cold side (F) of the primary circuit comprises an outlet point (S1) connected to another point of the primary circuit, referred to as the injection point (I1), of the hot side (C) by a bypass pipe (D1) allowing the primary fluid to be displaced only from the outlet point (S1) toward the injection point (I1). Another subject of the invention is a method of cooling said secondary fluid using said magnetocaloric thermal generator.