Solar appliance
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Solution Overview
Problem
Existing solar appliances are not efficiently designed to be robust, affordable, and readily manufactured while effectively utilizing solar insolation for heating without active heat sources.
Innovation Solution
The design incorporates double-wall bowls with evacuated volumes, translucent outer walls, and inner walls coated with opaque solar radiation absorbing materials, along with a detachable gasket and a vessel that extends beyond the rim of the bowl, allowing for efficient solar heating and easy access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-wall bowl design is used, then the manufacturing process is simpler and cost is lower, but the thermal insulation performance and structural robustness are insufficient
Solution Approach 1:
The bowl is divided into two separate walls (inner wall and outer wall) with an evacuated space between them. This segmentation provides thermal insulation by creating a vacuum barrier that reduces heat transfer, while maintaining manufacturing simplicity through modular construction of the two walls separately
Solution Approach 2:
The inner wall is nested within the outer wall, creating a double-wall structure where the inner bowl fits inside the outer bowl with an evacuated space between them. This nested configuration provides robust thermal insulation while keeping the overall structure compact and manufacturable
2Productivity
If active heating sources are added to improve heating efficiency, then heating performance is enhanced, but the appliance complexity and cost increase
Solution Approach 1:
The solar appliance uses passive solar heating where the translucent outer wall allows sunlight to penetrate and heat the contents directly without requiring active heating sources. The system serves itself by utilizing natural solar energy, eliminating the need for complex heating mechanisms while maintaining high heating efficiency
Solution Approach 2:
The design extracts and removes active heating sources from the system, relying instead on passive solar energy capture through the translucent outer wall. This extraction simplifies the overall system by eliminating complex heating mechanisms while maintaining effective heating performance through direct solar insolation
3Ease of operation
If the vessel rim is contained within the bowl rim for neat appearance, then aesthetic quality is improved, but ease of access and loading/unloading operations are reduced
Solution Approach 1:
The vessel rim is designed to extend dynamically beyond the outer wall rim when needed for easy access and loading operations, while the overall appliance maintains a compact form factor. This dynamic configuration allows operational flexibility without permanently compromising aesthetic appearance
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 enhances the efficiency and durability of solar appliances, enabling robust, affordable, and efficient heating of food and liquids using solar insolation, while maintaining ease of use and manufacturing.
Implementation Method 1
the inner wall spaced inwardly of the outer wall with an at least partially evacuated volume between the inner wall and the outer wall
Implementation Method 2
the outer wall of the first double-wall bowl being at least translucent to solar insolation and the inner wall of the first double-wall bowl at least one of: comprising or carrying an opaque solar radiation absorbing material
Implementation Method 3
heat food, liquids or other materials using solar insolation
Data Source
AI summary
A solar appliance includes first and second double-wall bowls, each having an outer wall and inner wall spaced inwardly of the outer wall with at least partial vacuum therebetween. The first and the second double-wall bowls each having an opening that provides passage between an interior and an exterior thereof. The outer walls are at least translucent and the inner walls have an opaque solar radiation absorbing material. A gasket detachably mates the first double-wall bowl with the second double-wall bowl at least proximate respective rims thereof in inverted relationship. A vessel with a rim is positionable in the interior of the first double-wall bowl, with the rim of the vessel extending beyond the rim of the first double-wall bowl to help secure the second double-wall bowl to the first double-wall bowl. A vent, for example in the gasket, can vent the interior to the exterior.