Humidifier Tub Lining for Heat Transfer and Electrical Insulation
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Solution Overview
Problem
Existing humidifier tubs face challenges in achieving efficient heat transfer while insulating the heating element from water, and accommodating thermal expansion, which affects energy efficiency and durability.
Innovation Solution
A tub design using a combination of two materials, where a stable, insulating first material forms the container and a biocompatible, thermally conductive second material provides an elastic lining to insulate and accommodate thermal expansion, allowing for effective heat transfer and sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single material is used for the container base to provide structural stability, then mechanical strength is improved, but thermal insulation increases causing energy loss
Solution Approach 1:
The base is constructed as a composite structure with a first material layer providing structural stability and a second material layer providing thermal insulation. This composite approach allows simultaneous achievement of mechanical strength and thermal insulation, resolving the contradiction between structural stability and heat loss.
2Strength
If a rigid heating element is used to maintain structural stability, then mechanical strength is improved, but accommodation of thermal expansion becomes difficult
Solution Approach 1:
The heating element incorporates a flexible circuit board instead of a rigid structure. This dynamic design allows the heating element to bend and accommodate thermal expansion and contraction while maintaining structural integrity and electrical connectivity, resolving the contradiction between structural stability and adaptability.
Solution Approach 2:
The heating element uses a flexible circuit board with thin film structure that can deform elastically to accommodate thermal expansion of the base material. This flexible structure maintains mechanical strength while providing the necessary adaptability to thermal changes.
3Use of energy by moving object
If the heating element is directly exposed to water for efficient heat transfer, then heat transfer efficiency is improved, but electrical insulation is compromised
Solution Approach 1:
A thermal conductive electrical insulating layer is introduced as an intermediary between the heating element and the water. This layer allows efficient thermal energy transfer while maintaining electrical insulation, resolving the contradiction between heat transfer efficiency and electrical safety.
Solution Approach 2:
The insulating layer is implemented as a thin flexible film that provides electrical insulation while maintaining thermal conductivity. This thin film structure minimizes thermal resistance while ensuring electrical safety, allowing the heating element to function efficiently in contact with water.
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 enhances energy efficiency by reducing heat loss, accommodates thermal expansion, and ensures effective sealing, making it cost-efficient and suitable for various applications.
Implementation Method 1
The water in the water tub is typically heated via thermal conduction between the heating element and the tub base of the water tub
Implementation Method 2
accommodate any stress caused by thermal expansion of, e.g., the heating element
Implementation Method 3
The second material, on the other hand, may be chosen such as to provide a preferably elastic lining which is adapted to electrically insulate the supply of water from the heating element and at the same time accommodate any stress caused by thermal expansion
Data Source
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AI summary
The present technology relates to a tub for a humidifier comprising a container made of a first material, a heating element, and a lining made of a second, preferably biocompatible, material different from the first material, wherein the container comprises a base and a side wall defining a reservoir for a supply of liquid to be evaporated, the heating element is provided on the base of the container, and the lining covers the heating element and a substantial portion of the inner surface of the side wall of the container.