Sulfonated Copolymer ERV Membrane for Heat and Vapor Exchange
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Solution Overview
Problem
Energy recovery ventilation (ERV) systems face challenges in efficiently exchanging both sensible and latent heat between air streams, particularly due to limitations in the membrane's ability to transport water vapor, which affects latent heat transfer.
Innovation Solution
A membrane composed of a microporous substrate laminated with a sulfonated block copolymer, featuring end blocks with little to no sulfonic acid functionality and interior blocks with a high percentage of sulfonic acid or sulfonate functionality, is used in the ERV system to enhance water vapor transport and heat exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a thin layer barrier is used for sensible heat exchange, then heat transfer efficiency is improved, but latent heat transfer capability deteriorates
Solution Approach 1:
The membrane is segmented into multiple functional layers: a microporous substrate layer for mechanical support and a sulfonated block copolymer layer for selective water vapor transport. This segmentation allows each layer to optimize its specific function - the substrate provides structural integrity while the copolymer layer enables high water vapor permeability for latent heat transfer.
Solution Approach 2:
The invention uses a composite membrane structure combining a microporous substrate with a sulfonated block copolymer coating. This composite material approach allows the membrane to simultaneously achieve the mechanical properties needed for structural stability and the chemical properties required for high water vapor transport, resolving the contradiction between thin barrier efficiency and latent heat transfer capability.
2Quantity of substance
If the membrane has high water vapor transport capability, then latent heat exchange is improved, but membrane structural stability deteriorates
Solution Approach 1:
The membrane structure is divided into a stable microporous substrate layer that provides mechanical strength and a functional sulfonated block copolymer layer that provides water vapor transport capability. This segmentation allows the substrate to maintain structural stability while the copolymer layer enables high water vapor permeability.
Solution Approach 2:
The microporous substrate provides a three-dimensional porous network that maintains structural integrity while allowing water vapor transport. The porosity of the substrate works synergistically with the sulfonated block copolymer layer to enable high water vapor transport rates without compromising mechanical stability.
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 described membrane configuration significantly improves latent heat exchange by increasing water vapor transport rates, leading to more efficient sensible and latent heat transfer between air streams, thereby enhancing the overall performance of ERV systems.
Implementation Method 1
The sulfonated block copolymer has high water vapor transport rates, thus facilitating efficient latent heat exchange
Implementation Method 2
a thin layer barrier may transfer heat rather easily
Data Source
AI summary
A core unit for an energy recovery system for exchanging heat and vapor between two independent intake and exhaust airstreams without intermixing thereof, the core unit having a fibrous microporous support substrate and a sulfonated block copolymer having at least one end block A and at least one interior block B wherein each A block contains essentially no sulfonic acid or sulfonate ester functional groups and each B block is a polymer block containing from about 10 to about 100 mol percent sulfonic acid or sulfonate ester functional groups based on the number of monomer units, and wherein the sulfonated block copolymer is laminated on the microporous support substrate.