Heat Exchanger Membrane Structure for Condensation-Resistant Bonding
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Solution Overview
Problem
Heat exchanger membranes with low air permeability and good moisture permeability face issues with anti-condensation properties, as moisture-permeable resins used in prior art tend to be washed away by condensation or dissolve, leading to pinholes and poor bonding between layers.
Innovation Solution
A membrane with a moisture-permeable resin layer internally disposed within the reinforcing member, positioned on the interface with the porous film, enhancing bonding and reducing resin outflow, achieved through lamination and application of a mixed resin-solvent solution from the reinforcing member side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If moisture-permeable resin layer is disposed on the surface of heat exchanger membrane, then moisture permeability is improved, but anti-condensation properties deteriorate due to resin being washed away by condensation
Solution Approach 1:
The moisture-permeable resin layer is moved from the surface (2D) to the interior (3D) of the porous supporting layer, changing its spatial dimension. This internal positioning allows the resin layer to remain protected from direct contact with condensation water while still providing moisture permeability through the porous structure.
Solution Approach 2:
The moisture-permeable resin layer is nested within the porous supporting layer, with the resin layer being internally disposed in the porous structure. This nesting arrangement protects the resin layer from direct exposure to condensation while maintaining its moisture permeability function through the porous matrix.
2Reliability
If moisture-permeable resin layer is covered by reinforcing member, then anti-condensation properties are improved, but bonding strength deteriorates due to poor bonding between layers
Solution Approach 1:
The moisture-permeable resin layer and porous supporting layer are merged into a single integrated structure where the resin layer is internally disposed within the porous layer. This merging eliminates the interface between separate layers, preventing delamination and maintaining strong bonding while preserving anti-condensation properties.
Solution Approach 2:
The moisture-permeable resin layer is nested within the porous supporting layer, creating a unified structure without distinct interfaces. This nesting eliminates the bonding problem between separate layers while maintaining the protective function against condensation.
3Strength
If triple-layer construction is used with reinforcing member, then structural strength is improved, but delamination occurs due to poor bonding between porous film and reinforcing member
Solution Approach 1:
The moisture-permeable resin layer and porous supporting layer are merged into one integrated layer with the resin internally disposed within the porous structure. This reduces the number of interfaces from two (in triple-layer) to one, eliminating delamination issues while maintaining structural strength through the unified structure.
Solution Approach 2:
The separate moisture-permeable resin layer is extracted from the layered structure and integrated into the porous supporting layer. This extraction and integration eliminates the interface problems that cause delamination, while the porous structure maintains 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 solution improves anti-condensation properties and bonding strength between the porous film and reinforcing member, preventing resin outflow and pinhole formation, while maintaining high air and moisture permeability.
Implementation Method 1
a moisture-permeable resin layer, internally disposed in the porous supporting layer and positioned on the side of the interface with the porous film
Implementation Method 2
a porous supporting layer with a porosity of 30 to 95%
Data Source
AI summary
A membrane 12 that exhibits superior condensation resistance regardless of the type of moisture-permeable resin, that has satisfactory adhesion between a porous film and a reinforcing member, and that can be manufactured in a simple manner.The membrane 12 is a laminated article 23 containing a porous film 20 and a reinforcing member 40, and the reinforcing member 40 has a moisture-permeable resin layer 30 on the side of an interface 50 with the porous film 20. To reliably form the moisture-permeable resin layer (moisture-permeable resin film) 30, the average pore diameter of the porous film 20 is preferably 0.01 to 10 μm, and the porosity of the reinforcing member 40 is preferably 30 to 95%. According to the membrane 12 of the present invention, even if the moisture-permeable resin is water-soluble (for example, polyvinyl alcohol), condensation resistance is still satisfactory. If the difference between the critical surface tension γc2 of the reinforcing member 40 and the critical surface tension γc1 of the porous film 20 (γc2−γc1) is set in advance to −5 mN/m or greater, the moisture-permeable resin layer 30 can be disposed internally at a specific location.