Three-Zone Fabric for Sustained Evaporative Cooling
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Solution Overview
Problem
Current methods for cooling individuals outdoors are ineffective and impractical, as they require constant water sources, can cause skin irritation, or rely on limited and hazardous chemicals, lacking a non-chemical means to regulate moisture dispersal for extended evaporative cooling.
Innovation Solution
A fabric with three functional zones - hydrophobic, hydrophilic, and intermediate - is woven or knitted to control liquid movement, allowing for efficient evaporation and retention of moisture, providing sustained thermal regulation without chemicals, and maintaining cooling properties for an extended period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional fabric materials (cotton, towels) are soaked in cold water for cooling, then immediate cooling effect is achieved, but the cooling effect lasts only for a very short period (one minute or so) as body heat and ambient temperature rapidly warm the water
Solution Approach 1:
The fabric is divided into three distinct functional zones with different liquid movement rates: a first zone with fast liquid movement, a second intermediate zone with moderate liquid movement, and a third zone with slow liquid movement. This segmentation allows the fabric to manage moisture dispersal at different rates, extending the cooling duration by preventing rapid warming of the liquid.
Solution Approach 2:
Different portions of the fabric are given different properties through the three functional zones. Each zone has specific characteristics tailored to its function: the first zone allows rapid moisture transport, the second zone provides intermediate control, and the third zone enables slow, sustained moisture release. This local differentiation solves the contradiction by creating regions optimized for different stages of the cooling process.
2Temperature
If ice is used for cooling, then strong cooling effect is achieved, but ice is limited in availability, costly to form, and cannot conform to most areas of the body
Solution Approach 1:
The invention uses a flexible fabric structure that can be easily formed and conform to various body areas. The fabric's flexible nature allows it to adapt to different shapes and contours, unlike rigid ice blocks. This resolves the contradiction by providing a cooling medium that is both effective and highly adaptable to different body regions.
Solution Approach 2:
The fabric can be used with liquid in different states (liquid or frozen) and the user can adjust the temperature parameter by controlling the liquid temperature before application. This flexibility in parameter adjustment allows the fabric to provide effective cooling while maintaining adaptability to various body areas, unlike fixed-form ice.
3Temperature
If alcohol-dipped towels are used for cooling, then cooling effect is achieved, but alcohol is drying to the skin and can lead to rashes and other skin irritations
Solution Approach 1:
The invention converts the potentially harmful effect of rapid evaporation (which causes drying and irritation) into a beneficial controlled process. By using the three-zone structure, the fabric controls moisture dispersal to provide cooling through regulated evaporation, avoiding the harmful rapid drying effect of alcohol while maintaining the cooling benefit.
Solution Approach 2:
The fabric acts as an intermediary between the cooling liquid and the skin. Instead of applying alcohol directly to the skin, the fabric mediates the cooling process by controlling liquid movement and evaporation rates, thereby eliminating direct skin contact with harmful substances while still achieving the desired cooling effect.
4Temperature
If phase change materials are used for cooling, then cooling effect is achieved, but the chemicals can be hazardous and ineffective if their carriers are breached
Solution Approach 1:
The invention uses water, a safe and non-hazardous liquid, as the cooling medium instead of hazardous phase change materials. While water may need to be replenished, it eliminates safety concerns associated with chemical carriers. This resolves the contradiction by prioritizing safety and reliability through the use of a benign substance.
Solution Approach 2:
The invention eliminates the need for hazardous chemicals by using water, turning a potentially harmful cooling method into a safe one. The three-zone fabric structure compensates for water's lower cooling intensity by extending the duration and controlling the delivery, thereby achieving effective cooling without chemical hazards.
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 fabric effectively regulates temperature by managing moisture dispersal, providing extended cooling without the need for constant water or chemicals, maintaining cooling efficacy even when wet or frozen, and is flexible enough to conform to body shapes.
Implementation Method 1
Evaporative cooling is the natural effect of moisture escaping into the atmosphere at will. The ability to regulate the rate of moisture dispersal and create one's personal cooling environment for an expanded period of time in a device, such as a fabric, is desirable.
Implementation Method 2
A fabric and method of making the fabric are disclosed. The fabric is formed by weaving or knitting a plurality of yarns together to form a plurality of zones
Data Source
AI summary
A fabric for thermal management including the cooling of an object, such as a person's skin. The fabric is formed of a plurality of functional zones arranged to extend the period of cooling without the use of artificial cooling chemicals. The functional zones include one or more of three different functional zone types. The first type diverts moisture. The second type retains and stores moisture. The third type absorbs moisture. One of the functional zones may be punched to create perforations to provide fabric flexibility and to assist in liquid diversion from within the fabric. An anchor system facilitates retention of the fabric on the object.