Methods, compositions and systems for solid-state barocaloric applications
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Solution Overview
Problem
Current cooling technologies, particularly vapor compression cycles using hydrofluorocarbons, have high global warming potential and cannot be scaled down for miniaturization needs in next-generation electronics, while barocaloric materials face challenges with low thermodynamic efficiencies and mechanical durability.
Innovation Solution
A method employing a barocaloric cycle using a composition with an organic layer between inorganic layers, where compression induces an exothermic phase transition releasing latent heat, utilizing materials like 2D perovskites with long-chain alkylammonium species and transition metal halides, allowing for reversible entropy changes and efficient heat management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If vapor compression cycles using hydrofluorocarbons are used for cooling, then cooling performance is achieved, but global warming potential increases
Solution Approach 1:
The invention changes the physical parameter of pressure to drive the phase transition in barocaloric materials, replacing the chemical parameter (hydrofluorocarbon refrigerants) that causes global warming. By applying pressure to induce solid-solid phase transitions, the system achieves cooling without greenhouse gas emissions.
Solution Approach 2:
The invention utilizes solid-solid phase transitions in barocaloric materials where pressure-induced structural changes (e.g., from non-centrosymmetric to centrosymmetric phases) drive reversible temperature changes. This phase transition mechanism replaces vapor compression cycles and eliminates the need for harmful refrigerants.
2Temperature
If conventional cooling methods are used, then cooling is achieved, but miniaturization for microchip dimensions is not possible
Solution Approach 1:
The invention enables localized cooling by integrating barocaloric materials directly at the heat-generating site on microchips. The materials can be deposited as thin films in specific locations, providing targeted thermal management where it is most needed rather than requiring large-scale conventional cooling systems.
Solution Approach 2:
The invention replaces the mechanical vapor compression system with a solid-state barocaloric system that uses pressure-induced phase transitions. This substitution enables miniaturization because the solid-state materials can be integrated directly into microchip structures, eliminating the need for large mechanical compressors and refrigerant circulation systems.
3Temperature
If magnetocaloric materials are used for cooling, then cooling performance is improved, but cost increases due to expensive rare-earth materials
Solution Approach 1:
The invention employs inexpensive barocaloric materials such as organic-inorganic hybrid perovskites and metal halides that do not require rare-earth elements. These materials can be synthesized through low-cost solution-processing methods, making them economically viable for large-scale commercial applications compared to expensive magnetocaloric materials.
Solution Approach 2:
The invention uses composite barocaloric materials combining organic and inorganic components (e.g., alkylammonium metal halides) that exhibit enhanced barocaloric effects. These composite structures provide both high performance and cost-effectiveness by utilizing abundant, non-rare-earth elements while maintaining the desired thermodynamic properties.
4Temperature
If elastocaloric materials are used for cooling, then cooling is achieved, but fatigue life is limited
Solution Approach 1:
Instead of using elastocaloric materials that rely on reversible elastic deformation of shape-memory alloys (which accumulate fatigue damage), the invention inverts the approach by using barocaloric materials where pressure-induced phase transitions occur in the crystal structure without mechanical fatigue. The solid-solid transitions are structurally reversible and do not degrade with cycling.
5Temperature
If electrocaloric materials are used for cooling, then cooling performance is improved, but energy consumption increases due to high electric field requirements
Solution Approach 1:
The invention replaces the electrocaloric mechanism (which requires high electric fields and consumes significant energy) with a barocaloric mechanism driven by mechanical pressure. The pressure-induced phase transitions in barocaloric materials require less energy input and can be achieved through simpler mechanical actuation, reducing overall energy consumption while maintaining cooling performance.
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 environmentally friendly, scalable, and efficient cooling and heating solutions with high thermodynamic performance, overcoming the limitations of traditional cooling technologies and improving miniaturization capabilities.
Implementation Method 1
applying compression to the composition to induce the organic layer to undergo an exothermic phase transition to an ordered state, releasing latent heat
Implementation Method 2
induce the organic layer to undergo an exothermic phase transition to an ordered state
Implementation Method 3
removing the compression to allow the composition to revert to the disordered state
Data Source
AI summary
The invention provides methods, compositions, and systems for barocaloric applications such as cooling, heating, and energy storage.