Air Heater With Indirect Ceramic Heating Element
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Solution Overview
Problem
Conventional air heaters introduce impurities into the heating process due to the breakdown of metal heating wires, which is problematic for applications requiring high purity, such as semiconductors and LEDs.
Innovation Solution
The air heater design incorporates a direct heat generating portion heated by electricity and an indirect heat generating portion made of non-metal materials like ceramic, which heats the air without direct contact, preventing impurities from entering the air stream. This design includes a housing made of insulating material and a frame for support, with the direct heat generating portion either embedded or placed outside the indirect heat generating portion, ensuring air is heated indirectly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a metal heating wire is used to heat air directly, then heating efficiency is improved, but metal particles break off and contaminate the air
Solution Approach 1:
The patent introduces a non-metallic heating element (such as a ceramic heater or carbon-based heating element) as an intermediary between the electrical power source and the air. This intermediary material does not produce metal particles when heated, thus preventing contamination while still efficiently transferring thermal energy to the air through radiation and convection.
Solution Approach 2:
The patent replaces the traditional metal wire-based resistive heating element with an alternative heating mechanism such as a ceramic heating plate or carbon fiber heating element. This substitution eliminates the mechanical breakdown and particle generation inherent in metal wires while maintaining the electrical-to-thermal energy conversion function.
2Object-generated harmful factors
If a non-metal indirect heat generating portion is used to prevent impurities, then air purity is improved, but thermal efficiency may be reduced
Solution Approach 1:
The patent optimizes the physical and chemical parameters of the non-metallic heating material (such as thermal conductivity, specific heat capacity, and emissivity) to maximize thermal efficiency. By carefully selecting materials with appropriate parameters, the system achieves high heating efficiency while maintaining air purity, thus resolving the perceived trade-off between purity and efficiency.
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 solution effectively prevents metal particles from contaminating the air, maintaining purity and enhancing thermal efficiency by using non-metal indirect heat generating portions to heat the air without direct contact with the metal heating wire, thus addressing the impurity issue in conventional air heaters.
Implementation Method 1
a direct heat generating portion (270) configured to be heated by an electric current supplied from outside
Implementation Method 2
an indirect heat generating portion configured to be heated by conductive heat, which is supplied by physical contact with the heated direct heat generating portion, and configured to heat air coming in through an inlet opening
Data Source
AI summary
The present disclosure provides an air heater. The air heater comprises: a direct heat generating portion configured to be heated by an electric current supplied from outside; an indirect heat generating portion configured to be heated by conductive heat, which is supplied by physical contact with the heated direct heat generating portion, and configured to heat air coming in through an inlet opening formed on one side while the air is passing through an outlet opening formed on the other side; and a housing made of an insulating material that provides a space where the direct heat generating portion and the indirect heat generating portion are placed, and that comprises an air inlet on one side through which the air is drawn in from outside and an air vent on the other side through which the air is released.