Insulating material with renewable resource component
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Solution Overview
Problem
Existing refrigerator insulation methods are inefficient and costly, lacking effective integration of renewable resources to reduce thermal conductivity while maintaining insulation efficiency.
Innovation Solution
An insulating system incorporating a renewable resource component, such as rice husks, with a particle size of 10-25 microns, combined with a polyurethane foam or other insulating materials to form a multi-component insulation structure that fills the insulation gap between the inner and outer liners of a refrigerator cabinet, providing a cost-effective and environmentally friendly solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If standard polyurethane foam is used for insulation, then insulation efficiency is maintained, but cost is high
Solution Approach 1:
The patent uses a composite material system consisting of renewable resource particles (rice husks, corn cobs, or wood fibers) combined with polyurethane foam binder. This composite approach allows the insulation material to maintain thermal performance comparable to pure polyurethane foam while significantly reducing cost by replacing expensive foam with abundant, low-cost renewable particles that provide both structural framework and insulating properties.
Solution Approach 2:
The patent optimizes the particle size of renewable resources to a specific range (10-25 microns) to maximize insulation efficiency. This parameter control ensures that the particles are small enough to pack densely and provide effective thermal barrier properties, while being large enough to maintain structural integrity. The controlled particle size distribution allows the composite material to achieve thermal conductivity values comparable to standard polyurethane foam.
2Ease of manufacture
If renewable resource component is added to reduce cost, then cost decreases, but insulation efficiency may deteriorate
Solution Approach 1:
The patent creates a composite where renewable resource particles (such as rice husks, corn cobs, or wood fibers) are dispersed within a polyurethane foam matrix. This composite structure allows the renewable particles to provide thermal insulation through their cellular structure and air-trapping capability, while the polyurethane binder ensures proper adhesion and structural integrity. The synergistic combination maintains thermal conductivity values comparable to pure polyurethane foam while reducing material cost.
Solution Approach 2:
The patent utilizes the naturally porous structure of renewable resource particles to provide effective thermal insulation. The particles contain internal voids and cellular structures that trap air, creating thermal barriers that resist heat transfer. This porous architecture allows the renewable materials to achieve insulating performance comparable to dense polyurethane foam, while the particles themselves provide both structural support and thermal resistance.
3Reliability
If renewable resource component with optimized particle size is used, then insulation efficiency is enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent specifies a controlled particle size range of 10-25 microns for renewable resource materials to optimize insulation performance. This parameter control ensures uniform distribution of particles within the insulation structure, maximizes surface area for heat transfer resistance, and facilitates proper packing density. The standardized particle size specification simplifies manufacturing by providing clear quality control parameters while achieving enhanced thermal insulation efficiency.
Solution Approach 2:
The patent employs abundant, low-cost renewable resources such as rice husks, corn cobs, and wood fibers that can be easily sourced and processed. These materials are readily available as agricultural byproducts, requiring minimal processing to achieve the desired particle size and form. The simplicity of sourcing and processing these materials offsets the need for complex manufacturing equipment, making the overall process economically viable despite the particle size optimization requirements.
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 solution achieves a thermal conductivity comparable to standard polyurethane foams while reducing costs by up to 90% and enhancing insulation efficiency, making it a more sustainable and economical option for refrigerator insulation.
Implementation Method 1
An insulating member having a body portion and a core portion disposed within an interior of the body portion. The core portion comprises a renewable resource component... An exterior portion substantially surrounds the core portion, and includes an insulating material defining a vapor barrier around the core portion.
Implementation Method 2
An exterior portion substantially surrounds the core portion, and includes an insulating material defining a vapor barrier around the core portion.
Data Source
AI summary
An insulated cabinet structure includes an inner liner having a plurality of walls defining a refrigerator compartment, and an external wrapper having a plurality of walls defining a refrigerator compartment receiving area. An insulation gap is formed between the walls of the inner liner and the walls of the external wrapper. A first insulation material is positioned on a wall of the external wrapper and extends outwardly into the insulation gap to partially fill the insulation gap. The first insulation material includes a renewable resource component having a particle size in a range from about 10 microns to about 25 microns. A second insulation material is disposed in the insulation gap, such that the first insulation material and the second insulation material together substantially fill the insulation gap.