Ionocaloric Heating and Cooling Cycle to Replace HFC Vapor Compression
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Solution Overview
Problem
Current cooling technologies rely heavily on vapor compression systems using hydrofluorocarbons (HFCs) that contribute to global warming, and alternative liquid-based solutions like hydrofluoroolefins have smaller power densities and environmental concerns, while solid-state alternatives are not yet cost-effective.
Innovation Solution
The ionocaloric effect is utilized in a thermodynamic cycle by mixing a solid caloric material with an electrolyte solution, applying an electrochemical field to lower its melting point, separating the materials, and allowing the caloric material to melt and precipitate to transfer heat, using materials like ethylene carbonate (EC) and sodium iodide (NaI) to achieve large temperature changes and high refrigeration capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If vapor compression systems using HFCs are used for cooling, then cooling capacity is achieved, but greenhouse gas emissions occur
Solution Approach 1:
The patent changes the physical and chemical parameters of the cooling system by transitioning from vapor compression with HFCs to ionocaloric effect using electrolyte solutions and solid materials. This involves changing the working medium from gaseous HFCs to aqueous electrolyte solutions combined with solid caloric materials, fundamentally altering the thermodynamic parameters and eliminating greenhouse gas emissions while maintaining cooling capacity
Solution Approach 2:
The patent utilizes phase transitions of solid caloric materials (melting and freezing) in combination with electrolyte solutions to achieve cooling and heating effects. The solid material undergoes phase change at controlled temperatures, absorbing or releasing latent heat, which drives the cooling cycle without requiring greenhouse gas refrigerants
2Object-generated harmful factors
If liquid-based alternative solutions like hydrofluoroolefins are used, then environmental concerns are reduced, but power density decreases
Solution Approach 1:
The patent employs composite material systems combining solid caloric materials with aqueous electrolyte solutions. This composite approach integrates the environmental benefits of water-based solutions with the high power density potential of solid-state phase change materials, achieving both environmental sustainability and high power output that overcomes the limitations of liquid-based alternatives alone
3Object-generated harmful factors
If solid-state cooling alternatives are developed, then environmental friendliness is improved, but cost-effectiveness decreases
Solution Approach 1:
The ionocaloric system utilizes self-driven phase change processes where the solid caloric material automatically melts and freezes based on temperature and electrolyte concentration conditions. This self-regulating mechanism reduces the need for complex external control systems and expensive components, thereby improving cost-effectiveness while maintaining environmental friendliness
Solution Approach 2:
The patent employs aqueous electrolyte solutions as the working medium, utilizing fluid dynamics and hydrostatic principles to transport the electrolyte solution between chambers. This hydraulic approach replaces expensive mechanical compression systems with simpler, more cost-effective fluid-based transport mechanisms, enhancing economic viability
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 provides environmentally benign, high-capacity heating and cooling without greenhouse gas emissions, suitable for room temperature applications, and can be used for refrigeration, central air conditioning, and other cooling needs.
Implementation Method 1
combining the first material with a second material, wherein the second material provides an electrochemical field to the first material to reduce the melting point of the first material and allowing the first material to melt, wherein the first material extracts heat from a cold reservoir upon melting
Implementation Method 2
the separation technique comprises electrodialysis or Faradaic deionization. In some embodiments, the electrodialysis comprises separating the first material from the second material by applying the voltage across electrode compartments comprising iodide triiodide redox couples
Implementation Method 3
the separation technique comprises electrodialysis or Faradaic deionization
Implementation Method 4
allowing the first material to melt, wherein the first material extracts heat from a cold reservoir upon melting
Implementation Method 5
allowing the first material to precipitate, wherein the first material releases heat to a hot reservoir coupled to the precipitation chamber during precipitation
Data Source
AI summary
Disclosed herein are methods, systems, and devices heating and cooling via an ionocaloric cycle. Methods include providing a first material in a solid state, combining the first material with a second material, wherein the second material provides an electrochemical field to the first material to reduce the melting point of the first material, and allowing the first material to melt, wherein the first material extracts heat from a cold reservoir upon melting. The method further includes separating the first material from the second material by a separation technique using a voltage applied to a combination of the first material and the second material and allowing the first material to precipitate, wherein the first material releases heat to a hot reservoir during precipitation.