Helicoid Ceramic Heating Resistor for Enhanced Fluid Heat Transfer
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Solution Overview
Problem
Existing electrical heating elements for fluids, particularly air, face inefficiencies in heat transfer due to small effective thermal energy transfer surfaces and high maintenance needs, with silicon carbide ceramics being costly and prone to wear.
Innovation Solution
A ceramic heating resistor with a helicoid body design that allows fluid to flow around it in a helical path, optimizing heat transfer while minimizing the heating resistor's thermal expansion and material thickness, using a composite material of molybdenum disilicide and feldspar for reduced production costs and improved durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a tubular resistor element with helical cut-outs is used to increase surface area for heat transfer, then the effective surface for thermal energy transfer is increased, but the device complexity and manufacturing difficulty increase due to the complex helical structure
Solution Approach 1:
The patent applies a helicoid body with a curved, spiral geometry instead of a simple tubular structure. The helicoid shape creates extended surface area through its helical form, allowing fluid to flow around it in a helical path that enhances heat transfer efficiency while maintaining a compact overall structure.
Solution Approach 2:
The invention transitions from a two-dimensional tubular surface to a three-dimensional helicoid structure that extends into the fluid flow path. By adding the helical dimension, the resistor element intercepts more fluid flow and creates a longer heat transfer path without significantly increasing the axial length of the device.
2Reliability
If silicon carbide ceramic is used for the heating resistor, then high temperature resistance and durability are improved, but production costs increase due to high sintering temperatures required
Solution Approach 1:
The patent employs a composite material system consisting of molybdenum disilicide (MoSi2) as the heating element embedded in a ceramic matrix. MoSi2 provides high-temperature stability and forms a protective silica layer at operating temperatures, while the ceramic matrix provides structural support. This composite approach achieves high-temperature durability at lower production costs compared to pure silicon carbide.
Solution Approach 2:
The invention changes the material composition parameters by using molybdenum disilicide instead of silicon carbide as the primary heating material. MoSi2 has a lower melting point and can be sintered at lower temperatures than SiC, reducing production costs while maintaining adequate high-temperature performance through its protective oxide layer formation.
3Ease of operation
If helical heating wires are threaded manually into ceramic tubes, then heating function is achieved, but the device complexity and maintenance needs increase due to complex assembly and wear-prone components
Solution Approach 1:
The patent merges the heating wires and ceramic tube into a single integrated ceramic heating resistor component. The molybdenum disilicide heating element is embedded within the ceramic matrix during sintering, creating a monolithic structure that eliminates the need for separate assembly steps and reduces maintenance requirements.
Solution Approach 2:
The invention replaces the mechanical assembly process of threading wires into tubes with a ceramic sintering process. The heating element and structural matrix are formed together in a single thermal processing step, eliminating complex mechanical assembly operations and creating a more reliable, maintenance-free component.
4Loss of energy
If the tubular wall thickness is reduced to allow more energy transfer, then heat transfer efficiency is improved, but the mechanical strength and structural integrity deteriorate
Solution Approach 1:
The patent uses a composite structure where the ceramic matrix provides mechanical strength and structural integrity while the embedded molybdenum disilicide heating elements provide the heat transfer function. This composite architecture allows for thin overall wall thickness to maximize heat transfer surface area while the ceramic matrix maintains structural rigidity.
Solution Approach 2:
The invention applies different material properties to different regions: the ceramic matrix provides structural support and thermal insulation where needed, while the molybdenum disilicide regions provide high-temperature heat generation and transfer. This local differentiation of material functions allows thin walls to achieve high heat transfer efficiency without sacrificing overall structural strength.
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
The helicoid design enhances heat transfer efficiency at lower temperatures, reduces maintenance needs, and lowers production costs by using cost-effective materials, resulting in a more compact and durable heating element.
Implementation Method 1
the part of an electrical heating element that actively generates and gives off heat when current is flowing
Implementation Method 2
A helicoid body results from a planar surface being twisted along a screw line in the Euclidian space about a central screw axis
Data Source
AI summary
A ceramic heating resistor to be arranged in a tubular element of an electrical heating element for heating a fluid, preferably air, wherein the heating resistor can be produced by sintering a green body comprising at least one ceramic raw material. The heating resistor includes an electrically insulating component and an electrically conducting component, and the electrically insulating component forms a matrix in which the electrically conducting component is accommodated. An electrical heating element for heating a fluid, preferably air, including at least one tubular element, through which a fluid flows or can flow, and to a device for heating a fluid, preferably air, including at least one such heating element.