Composite Refrigeration Line Set With Reflective Insulation
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Solution Overview
Problem
Current multilayer composite pipes face challenges in achieving high burst pressure and temperature resistance, particularly in refrigeration applications, due to limitations in material thickness and reinforcement, which can lead to reduced strength and increased risk of single-point failures.
Innovation Solution
The development of a composite refrigeration line set featuring an inner polyethylene tube, adhesive layers, an AL 3005-O aluminum layer with specific thickness ranges, and an outer polyethylene tube, optionally including a low-emissivity layer and reinforcement, to enhance burst pressure and temperature resistance, and incorporating multiple metal layers to prevent single-point failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If material thickness is increased to achieve high burst pressure, then burst pressure resistance is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies composite materials by combining multiple layers with different properties: an inner plastic layer for flexibility and corrosion resistance, an intermediate aluminum layer for high strength and barrier properties, and an outer plastic layer for protection. This multi-material composite structure achieves high burst pressure resistance (exceeding 1950 psi) without requiring excessive thickness of any single material, thereby resolving the contradiction between strength and complexity.
Solution Approach 2:
The pipe is segmented into multiple functional layers, each with specific thicknesses and materials optimized for particular functions. The inner plastic layer (first thickness), aluminum layer (second thickness), and outer plastic layer (third thickness) are segmented to distribute mechanical stresses and provide specialized functions, achieving high strength without monolithic complexity.
2Strength
If reinforcement is increased to achieve high burst pressure, then strength is improved, but manufacturing precision requirements increase
Solution Approach 1:
The composite structure with specifically controlled layer thicknesses (inner plastic layer, aluminum layer, outer plastic layer) provides inherent manufacturing precision through the nature of layer-by-layer fabrication. Each layer can be extruded or applied with controlled thickness, and the composite action of multiple layers provides redundancy, reducing the criticality of precise thickness control compared to a single thick layer.
Solution Approach 2:
The patent applies different material properties and thicknesses at different locations within the pipe wall. The aluminum layer provides localized high-strength reinforcement where needed, while the plastic layers provide flexibility and environmental resistance. This local optimization of material properties achieves high burst pressure without requiring uniform high precision throughout the entire structure.
3Ease of manufacture
If single-layer structure is used to simplify manufacturing, then ease of manufacture is improved, but reliability decreases due to single-point failures
Solution Approach 1:
The multi-layer composite structure (plastic-aluminum-plastic) provides inherent redundancy and failure resistance. If one layer develops a defect or failure point, the other layers continue to provide structural integrity and contain the refrigerant. This composite construction significantly improves reliability compared to a single-layer structure while remaining manufacturable through established multi-layer extrusion or bonding processes.
Solution Approach 2:
The multiple layers act as a form of beforehand cushioning against failures. The inner and outer plastic layers provide a protective barrier that cushions against potential failures in the intermediate aluminum layer, and vice versa. This layered protection was built into the structure in advance to prevent single-point failures from compromising the entire system.
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 burst pressures exceeding 1950 pounds per square inch and improved temperature resistance, reducing the risk of failures and enhancing the pipe's performance in refrigeration systems by distributing stress and preventing single-point weaknesses.
Implementation Method 1
a first adhesive layer positioned about the inner plastic tube; an aluminum layer positioned about the first adhesive layer and coupled to the inner plastic tube via the first adhesive layer; a second adhesive layer positioned about the aluminum layer
Implementation Method 2
The composite refrigeration line set can further include a low-emissivity layer positioned about the outer plastic layer. The low-emissivity layer can include low-emissivity aluminum.
Data Source
AI summary
One aspect of the invention provides a composite refrigeration line set including at least one selected from the group consisting of: a suction line and a return line, characterized in that one or more of the suction line and the return line are a composite refrigeration line set tube include: an inner plastic tube; a first adhesive layer positioned about the inner plastic tube; an aluminum layer positioned about the first adhesive layer and coupled to the inner plastic tube via the first adhesive layer; a second adhesive layer positioned about the aluminum layer; and an outer plastic layer positioned about the aluminum layer coupled to the aluminum layer via the second adhesive layer. The inner plastic tube is polyethylene of raised temperature. The outer plastic tube is polyethylene of raised temperature. The aluminum layer comprises AL 3005-O.