Paper for total heat exchanging element and total heat exchanging element
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Solution Overview
Problem
Conventional total heat exchange element papers face issues with moisture resistance and gas barrier properties, leading to water dripping and mixing of supply and exhaust air flows, especially in high humidity environments, which compromises ventilation efficiency and functionality.
Innovation Solution
A total heat exchange element paper comprising a substrate sheet with natural pulp beaten to a specified freeness and adhered cationic colloidal silica, along with a moisture absorbent, which enhances moisture resistance and gas barrier properties by preventing water dripping and air flow mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional porous material is used for total heat exchange element paper, then thermal transferability and moisture permeability are achieved, but gas barrier properties deteriorate causing mixing of supply and exhaust air flows
Solution Approach 1:
The patent applies a hydrophobic coating film on the porous substrate to create a barrier that prevents gas permeation while allowing moisture vapor transmission. This thin film acts as a selective barrier that blocks supply and exhaust air mixing while maintaining thermal transferability through the porous structure.
Solution Approach 2:
The invention combines a porous substrate material with a hydrophobic coating layer to create a composite structure. The porous substrate provides thermal transferability and moisture permeability, while the hydrophobic coating adds gas barrier properties, resolving the contradiction between energy efficiency and reliability.
2Use of energy by moving object
If total heat exchange element paper is exposed to high humidity environment, then moisture permeability allows humidity exchange, but moisture resistance deteriorates causing water dripping
Solution Approach 1:
The hydrophobic coating film serves as a protective layer that prevents liquid water penetration while allowing water vapor transmission. This thin film creates a selective barrier that maintains moisture permeability for humidity exchange while providing moisture resistance to prevent water dripping in high humidity environments.
Solution Approach 2:
The porous substrate structure allows moisture vapor to pass through while the hydrophobic coating prevents liquid water accumulation. The porous structure facilitates moisture permeability for latent heat exchange while the coating provides moisture resistance by repelling liquid water.
3Use of energy by moving object
If porous material structure is used to enable moisture permeability, then latent heat exchange is achieved, but gas permeability allows dirty gas components to pass through causing ventilation efficiency loss
Solution Approach 1:
The hydrophobic coating film creates a selective barrier that allows water vapor transmission for latent heat exchange while blocking larger gas molecules and particles. This thin film structure enables moisture permeability for humidity control while providing gas barrier properties to prevent dirty gas component passage and maintain ventilation efficiency.
Solution Approach 2:
The porous substrate enables moisture vapor transmission for latent heat exchange, while the hydrophobic coating on the porous structure provides gas barrier properties. The combination allows selective permeability where water vapor can pass through the porous structure for humidity exchange, but larger gas molecules and contaminants are blocked by the hydrophobic coating.
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 solution effectively prevents water dripping and air flow mixing, ensuring high moisture resistance and gas barrier properties, even in high humidity conditions, thereby maintaining ventilation efficiency and functionality.
Implementation Method 1
a substrate sheet and a moisture absorbent and colloidal silica both of which are adhered to the substrate sheet
Implementation Method 2
a moisture absorbent and colloidal silica both of which are adhered to the substrate sheet
Implementation Method 3
colloidal silica both of which are adhered to the substrate sheet... excellent gas barrier properties without the mixing of a supply air flow and an exhaust air flow
Data Source
AI summary
Total heat exchange element paper having excellent moisture resistance and gas barrier properties, comprising a substrate sheet and a moisture absorbent and colloidal silica both of which are adhered to the substrate sheet, wherein the substrate sheet contains natural pulp which has been beaten to a freeness specified in JIS P 8121-1:2012 of not lower than 80° SR and the colloidal silica is cationic colloidal silica.