PTC Heater Rib Layout With Meander Flow for Compact Heat Transfer
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Solution Overview
Problem
Existing electrical heating devices face challenges in achieving high thermal efficiency and compact construction while maintaining effective heat transfer to the medium being heated, particularly in designs with PTC heating elements and U-shaped recesses.
Innovation Solution
The electrical heating device incorporates a meander-type flow channel within the housing, where heating ribs protrude alternately from the inner sides, forming a meander-type flow channel with the adjacent housing wall, ensuring good heat transfer on both longitudinal and face sides of the PTC heating elements, and includes features like tapered supporting ridges and a connecting conductor board for enhanced thermal efficiency and compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If heating ribs are made thin-walled to facilitate thermal transmission, then heat transfer efficiency improves, but structural strength and abutment capability deteriorate
Solution Approach 1:
The heating ribs are designed with non-uniform wall thickness: the regions contacting the PTC heating element have greater thickness for structural strength and thermal conduction, while other regions are thinner to minimize thermal resistance and facilitate heat dissipation to the fluid. This local variation in thickness optimizes both structural integrity and thermal performance.
2Volume of moving object
If the device is made compact to reduce size, then space efficiency improves, but heat transfer surface area and heating power capacity deteriorate
Solution Approach 1:
The heating ribs extend in multiple directions and orientations within the compact housing, creating a three-dimensional heat transfer network. The ribs protrude from different walls and intersect to form a spatial structure that maximizes heat transfer surface area within the limited volume, effectively utilizing the third dimension to overcome the space-power trade-off.
3Loss of energy
If flow channel is designed to promote laminar flow for efficient heat transfer, then thermal efficiency improves, but flow distribution uniformity and heat dissipation to all surfaces deteriorate
Solution Approach 1:
The flow channel is segmented into multiple pathways that distribute fluid flow across different sections of the heating ribs. The meander-type flow channel with multiple turns and directions ensures that fluid contacts various surfaces of the heating ribs sequentially, improving flow distribution uniformity while maintaining efficient heat transfer through the segmented flow paths.
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 thermal efficiency by promoting laminar flow and effective heat dissipation to the medium, allowing for increased heating power and compact construction, with improved sealing and modular design for increased reliability and efficiency.
Implementation Method 1
PTC heating element, which abuts oppositely situated inner sides of the U-shaped recess in heat-conducting contact
Implementation Method 2
heat-conducting contact
Implementation Method 3
A flow passage of a meander-type flow channel is formed in the housing between the free ends of the heating ribs and the adjacent inner wall of the housing
Data Source
AI summary
An electrical heating device includes a housing, which encloses a circulation chamber through which a medium can flow and into which heating ribs extend essentially parallel to one another. Each of the ribs has a U-shaped recess which opens into a uniform connecting chamber, which is separated from the circulation chamber by a partition wall provided in the region of the open ends of the U-shaped recesses, and which accommodates at least one PTC heating element that abuts oppositely situated inner sides of the U-shaped recess in heat-conducting contact. The heating ribs protrude inwards alternately from the oppositely situated inner sides of the housing. A flow passage of a meander-type flow channel is formed in the housing between the free ends of the heating ribs and the adjacent inner wall of the housing. The flow passage is closed off by a covering element on the side oppositely situated to the partition wall.