Flexible Cellular Material Thermoregulation via Gas Compression
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Solution Overview
Problem
Existing shoe sole thermoregulation technologies are impractical due to intense initial cooling risks, short duration of cooling effect, high power consumption, fragility, and weight issues, failing to provide effective temperature regulation for extended periods or in hot environments.
Innovation Solution
A flexible cellular material with two layers of different shore hardness and thermal conductivity, featuring cells that compress and expand gas upon pressure changes, allowing for efficient heat exchange and temperature regulation through adiabatic processes, using silicone or elastomer materials with air or gas-filled cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If gel-filled sole devices are placed in a freezer to store coldness, then cooling effect is achieved, but the cold temperature is too intense at the beginning which risks the creation of burns and the device quickly becomes less effective
Solution Approach 1:
The patent changes the physical state and parameters of the cooling medium from liquid gel to gas. By using gas compression and expansion cycles, the system achieves gradual temperature modulation instead of intense initial cooling. The gas phase allows for controlled thermodynamic cycles that prevent extreme temperature drops while maintaining effective cooling over time.
Solution Approach 2:
The patent implements periodic compression and expansion cycles of the gas in the cells. Each step involves compressing the gas to generate heat that is dissipated to the environment, then expanding the gas to absorb heat from the foot. This periodic action creates a sustainable cooling effect without the intense initial cooling problem of frozen gel devices.
2Temperature
If gel-filled sole devices are used, then cooling effect is achieved, but the duration of the cooling effect is very short (a few minutes to tens of minutes)
Solution Approach 1:
The patent employs continuous periodic compression-expansion cycles that can be sustained throughout the entire duration of use. Each cycle regenerates the cooling effect, allowing the device to maintain effective cooling for hours rather than minutes. The mechanical work input from walking continuously drives the thermodynamic cycles, enabling prolonged operation without external power or pre-freezing.
Solution Approach 2:
The patent ensures continuous cooling action through the repeated compression and expansion cycles that occur with each step. The useful cooling effect is continuously regenerated rather than being a one-time effect that depletes over time. This allows the device to provide sustained cooling throughout long jogging sessions or extended wear periods.
3Temperature
If Peltier effect components are used, then thermal regulation is achieved, but significant power supply is required and the device becomes too heavy
Solution Approach 1:
The patent makes the system self-powered by utilizing the mechanical work already being performed during normal walking. The compression and expansion of gas in the cells is driven by the natural deformation of the sole material under foot pressure, eliminating the need for external power sources. This self-service mechanism converts the kinetic energy of walking directly into the cooling effect, removing batteries and power management components that would add weight.
Solution Approach 2:
The patent replaces the electrical Peltier effect system with a mechanical thermodynamic system. Instead of using electricity-driven heat pumps, the invention uses mechanical compression and expansion of gas to achieve the same thermal regulation. This substitution eliminates heavy electrical components, batteries, and power management systems while maintaining the temperature control function.
4Temperature
If Peltier effect components are used, then thermal regulation is achieved, but the components are very fragile and made of ceramic
Solution Approach 1:
The patent replaces fragile ceramic Peltier components with a flexible mechanical system based on gas-filled elastomeric cells. The new system uses compliant materials that can withstand repeated deformation without cracking or failing. By substituting brittle electronic components with flexible mechanical elements, the system achieves superior reliability and durability for active use.
Solution Approach 2:
The patent employs flexible elastomeric cells containing gas instead of rigid ceramic Peltier components. These flexible structures can accommodate the dynamic deformation experienced during walking and running without suffering from the fragility issues of ceramic materials. The flexible membrane structure provides both durability and the necessary mechanical compliance for integrated sole construction.
5Ease of operation
If breathable materials are used to evacuate water, then ventilation is improved, but true thermal regulation or significant temperature drop is not achieved
Solution Approach 1:
The patent utilizes phase transitions and thermodynamic cycles of gas compression and expansion to achieve active temperature control. During compression, heat is generated and dissipated; during expansion, heat is absorbed from the foot, creating a net cooling effect. This goes beyond passive ventilation by actively manipulating the thermal state through controlled phase changes and pressure variations.
Solution Approach 2:
The patent implements periodic compression-expansion cycles that actively pump heat away from the foot, rather than relying on passive evaporative cooling. Each cycle of gas compression and expansion creates a thermodynamic pump effect that actively removes heat, achieving true thermal regulation with significant temperature drops, unlike mere ventilation that only facilitates heat transfer through air flow.
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
Maintains a cool temperature during walking by compressing gas to heat it up and then expanding it to cool it down, providing sustained thermal regulation with reduced weight and power consumption, suitable for shoe soles and other applications with repetitive pressure cycles.
Implementation Method 1
with each step, the foot will compress the flexible material and the cells in the layer C will act as adiabatic chambers whose gas will heat up via compression
Implementation Method 2
the cells located in the layer (D) will act like a reactor nozzle that will expand the air and therefore cool it
Data Source
AI summary
A flexible cellular material is thermoregulated by compressing and expanding gas trapped in its cells A flexible elastomer material of a device that provide thermoregulation includes two layers of different shore hardness and conductivity and is has gas-filled cells. Each cell has a zone to store the gas when compressing the material in the layer C with higher hardness and thermal conductivity and another zone to expand the gas when decompressing the material in the layer D with lower hardness and thermal conductivity. The flexible material can be used as a sole in shoes to maintain a cool temperature. With each step, the cell zones located in the layer C act as adiabatic chambers whose gasses heat with compression. When the foot leaves the ground the zones of cells located in the layer D then act as a reactor nozzle that will expand the air and therefore cool it.