Double-Walled Drum Design for Radial Heated Air Flow in Dryers
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Solution Overview
Problem
Conventional clothes dryers have inefficiencies in heat transfer and air flow, leading to longer drying times due to limited surface area contact and bypassed heated air, which reduces the effectiveness of the drying process.
Innovation Solution
A double-walled drum design with holes between the outer and inner cylindrical walls allows heated air to flow directly through the drum, increasing the surface area for heat transfer and ensuring more direct airflow contacts the clothes, thereby enhancing drying efficiency without significant changes to the dryer's operation or capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If heated air is passed through a conventional single-walled drum, then the drying process can be performed with simple structure, but the surface area for heat transfer is limited and heated air bypasses the clothes reducing drying efficiency
Solution Approach 1:
The drum is segmented into a double-walled structure with an outer cylindrical wall and an inner cylindrical wall, creating multiple pathways for heated air to contact the clothes. This segmentation increases the surface area for heat transfer without requiring complete redesign of the drum assembly.
Solution Approach 2:
The invention adds a radial dimension to air flow by creating passages between the outer and inner cylindrical walls. Heated air can now travel through the radial space and exit through holes in the inner wall, providing multi-directional contact with the clothes rather than just axial flow through a single chamber.
2Temperature
If heated air flows through the drum from back to front, then the air flow path is simple and direct, but the heated air immediately cools down and has limited contact with the tumbling clothes
Solution Approach 1:
The air flow path is segmented into multiple zones: the air passage between outer and inner walls, the holes in the inner wall, and the interior chamber. This segmentation allows heated air to maintain temperature longer by traveling through the insulated air passage and distributing heat more uniformly across different locations where clothes are present.
Solution Approach 2:
The air passage between the outer and inner cylindrical walls acts as an intermediary channel that protects heated air from immediate contact with cool clothes. The heated air travels through this intermediate space, which helps maintain temperature, before exiting through holes to contact the clothes more effectively.
3Area of stationary object
If a double-walled drum design with air passages and holes is implemented, then heat transfer surface area increases and drying efficiency improves, but the drum structure becomes more complex
Solution Approach 1:
The drum is divided into functional segments: the outer cylindrical wall structure, the inner cylindrical wall with holes, and the air passage space between them. This segmentation allows each component to be manufactured separately and assembled, making the complex structure more manageable and manufacturable.
Solution Approach 2:
The double-walled drum structure serves multiple functions simultaneously: it provides the mechanical containment for clothes, creates heated air passages, provides heat transfer surfaces, and facilitates air circulation. This multi-functionality reduces the need for additional separate components, offsetting the complexity increase.
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 significantly reduces drying times and increases efficiency by ensuring more heated air interacts with the clothes, while maintaining the existing dryer's capacity and operational settings.
Implementation Method 1
The dryer heats the air using an electric heating element, a gas burner and the like
Implementation Method 2
The hot air evaporates water from the clothes as they spin inside the tumbler
Implementation Method 3
The inner cylindrical wall includes holes. The drum also includes an air passage formed between the outer cylindrical wall and the inner cylindrical wall to receive the heated air from the inlet air path. The heated air exits the air passage through the holes in the inner cylindrical wall
Data Source
AI summary
A dryer includes a drum to rotate while drying articles, such as clothes, using heated air. The drum includes an outer cylindrical wall and an inner cylindrical wall that fits within the outer cylindrical wall. An air passage is formed between the outer cylindrical wall and the inner cylindrical wall to receive heated air directed to the drum. The inner cylindrical wall includes holes into the interior of the drum. The heated air within the air passage passes through the holes into the interior of the drum to directly contact the articles.