Baking oven with an insulation
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Solution Overview
Problem
Existing baking oven insulation methods result in high energy losses due to thermal radiation and convective heat flow between the cavity wall and insulation, with prior solutions not effectively addressing these issues.
Innovation Solution
A dual-layer insulation system comprising a thin, low-density fibre material inner layer and a thicker, higher-density fibre material outer layer, with a metallic sheet material layer in between, which reduces heat conduction and enhances thermal radiation reflection, allowing for efficient heat retention and flexibility to adapt to the cavity wall without gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a single-layer insulation is used, then the device complexity is reduced, but the energy loss increases due to insufficient thermal barrier performance
Solution Approach 1:
The insulation system is divided into three distinct layers: an inner insulating layer adjacent to the cavity wall, a metallic sheet material layer in the middle, and an outer insulating layer. This segmentation allows each layer to perform its specific function - the inner layer reduces heat conduction, the metallic layer reflects thermal radiation, and the outer layer provides additional insulation, collectively reducing energy loss more effectively than a single-layer structure
Solution Approach 2:
The insulation system combines different materials with complementary properties: fibre-based insulating materials for thermal insulation and a metallic sheet material for radiation reflection. This composite structure leverages the advantages of each material type to achieve superior thermal barrier performance while managing energy loss
2Loss of energy
If the insulation thickness is increased, then the thermal insulation performance is improved, but the available space on the appliance is reduced
Solution Approach 1:
By dividing the insulation into three functional layers, the system achieves high thermal barrier performance within a limited total thickness. The metallic sheet material layer provides radiation reflection in a thin configuration, while the inner and outer insulating layers provide thermal insulation, collectively reducing thermal losses without requiring excessive space
Solution Approach 2:
Each layer is positioned to address specific heat transfer mechanisms at different locations within the insulation structure. The inner layer addresses heat conduction from the cavity wall, the metallic layer addresses thermal radiation, and the outer layer addresses external thermal exposure, optimizing the thermal barrier within the available space
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 configuration significantly reduces heat loss during the heating-up phase and provides enhanced thermal insulation, maintaining mechanical stability while minimizing energy consumption and storage capacity, thus improving overall energy efficiency.
Implementation Method 1
the first insulating layer comprises a thickness d1 which enables the metallic sheet material layer to efficiently reflect the thermal radiation from the cavity wall
Implementation Method 2
the first insulating layer comprises a thickness d1 which enables the first insulating layer to reduce the heat conduction from the cavity wall to the metallic sheet layer
Implementation Method 3
the energy losses of the baking oven are increased due to spacings between the cavity wall and the baking oven insulation allowing convective heat flow
Data Source
Figure 1~2
Figure 3~4
AI summary
Baking oven insulation (1), comprising at least a first insulating layer (2) composed of a fibre material, a metallic sheet material layer (3) and a second insulating layer (4) at least partially composed of a fibre material, wherein the first and second insulating layers (2, 4) are located at opposite sides of the metallic sheet material layer (3), wherein the first insulating layer (2) is an inner layer to be arranged immediately at the outer side of a cavity wall (12) of a baking oven (10) and immediately at the inner side of the metallic sheet material layer, and the second insulating layer (4) is an outer layer adapted to be spaced from the cavity wall (12) of the baking oven (1) wherein the first insulating layer (2) comprises a thickness d which enables the metallic sheet material layer to efficiently reflect the thermal radiation from the cavity wall and which enables the first insulating layer to reduce the heat conduction from the cavity wall to the metallic sheet layer (3).