Vacuum-Insulated Refrigerator Door for Reduced Cold Air Loss
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Solution Overview
Problem
Conventional refrigerator doors are inefficient in minimizing cold air loss when opened, as they typically require moving the entire door assembly, which can lead to increased energy consumption and reduced insulation effectiveness due to structural rigidity and loading issues.
Innovation Solution
The implementation of a vacuum insulated outer door that moves independently of the perimeter structure, featuring inner and outer layers with a vacuum cavity and porous core material, allowing for reduced air leakage and energy retention while supporting heavy loads through a rigid perimeter structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the entire door assembly is moved when opening the refrigerator door, then user access is provided, but cold air loss increases and energy consumption rises
Solution Approach 1:
The door assembly is divided into two independent parts: the perimeter structure (inner door) and the outer door. The outer door can be opened independently to provide user access, while the perimeter structure remains stationary to maintain the seal and prevent cold air loss. This segmentation allows selective opening of only the necessary portion.
Solution Approach 2:
The outer door is extracted as a separate movable element from the traditional single-door design. This outer door can be removed or opened independently, allowing users to access items without moving the entire door assembly, thereby minimizing the volume of cold air that escapes when the door is opened.
2Strength
If the door assembly is made rigid to support heavy loads on shelves, then structural integrity is maintained, but insulation effectiveness is reduced
Solution Approach 1:
The door system is segmented into a rigid perimeter structure for load-bearing and a separate outer door for insulation. The perimeter structure contains the shelves and supports heavy loads, while the outer door provides thermal insulation without needing to bear structural loads, allowing optimization of each component's function.
Solution Approach 2:
Different parts of the door system have different properties: the perimeter structure is designed with high strength and rigidity to support shelves and heavy items, while the outer door is designed with superior insulation properties (vacuum cavity with porous core material) to minimize thermal transfer, without requiring structural strength.
3Loss of energy
If a vacuum insulated door is used to improve insulation, then energy efficiency increases, but structural rigidity and load-bearing capacity are compromised
Solution Approach 1:
The door system separates the insulation function (outer door with vacuum cavity) from the structural support function (perimeter structure). This allows the outer door to be optimized for thermal insulation with a vacuum cavity and porous core material, while the perimeter structure provides the necessary rigidity and load-bearing capacity for shelves.
Solution Approach 2:
The outer door uses a composite vacuum insulation structure with inner and outer layers spaced apart to create a vacuum cavity, and porous core material disposed within the cavity. This composite structure provides superior insulation while the separate perimeter structure provides structural support, combining the benefits of both materials without compromising either function.
4Loss of energy
If the outer door moves independently without the perimeter structure, then cold air loss is minimized, but the mechanism complexity increases
Solution Approach 1:
The door assembly is segmented into an inner perimeter structure and an outer door that can move independently. The outer door is hinged or mounted to allow independent opening and closing, enabling selective access without moving the entire door assembly, thereby minimizing cold air loss while maintaining a relatively simple overall structure.
Solution Approach 2:
The outer door is extracted as an independent movable element with its own mounting mechanism. This allows the outer door to be opened and closed separately from the perimeter structure, creating a selective access system that reduces cold air loss. The independent mounting mechanism is designed to be straightforward, avoiding excessive complexity while achieving the desired functionality.
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 design enhances energy efficiency by minimizing cold air loss when opening the door, maintaining structural integrity, and preventing vacuum leakage, thus reducing energy consumption and improving insulation performance.
Implementation Method 1
The vacuum insulated outer door includes inner and outer layers that are spaced apart to define a vacuum cavity
Implementation Method 2
Porous core material may be disposed in the vacuum cavity
Data Source
AI summary
A refrigerator includes an insulated cabinet structure and a cooling system. A door assembly includes a perimeter structure that is movably mounted to the insulated cabinet structure and an outer door that is movably mounted to the perimeter structure whereby the outer door can be moved between open and closed positions relative to the perimeter structure when the perimeter structure is in its closed position The outer door may comprise a vacuum insulated structure including porous core material disposed in a cavity of the outer door.