Multilayer Glass Fibre Filter Medium for A+ Energy Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional filter media struggle to meet the increased requirements for energy efficiency class A+ as defined by EUROVENT 01/2015, particularly in terms of pressure drop and filtration efficiency.
Innovation Solution
A multilayer filter medium comprising a textile supporting layer, a filter layer constructed from a mixture of two types of glass fibres, and a textile covering layer, where the glass fibre filter layer is consolidated with chemical binders and has a specific fibre diameter distribution and ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional filter media are used, then production costs and manufacturing simplicity are maintained, but energy efficiency class A+ requirements cannot be met
Solution Approach 1:
The filter medium is divided into multiple functional layers: a base layer (10) providing structural support, a filter layer (20) with specific glass fiber compositions for filtration, and a cover layer (30) for protection. This segmentation allows each layer to be optimized for its specific function, achieving energy efficiency class A+ while maintaining manufacturability through standardized production processes for each layer type.
Solution Approach 2:
The filter layer uses composite material compositions including glass fibers with specific diameter distributions (0.6 μm±0.3 μm and 1.0 μm±0.3 μm in a 1:1 to 1:4 ratio), chemical binders at controlled concentrations (5-30% by weight), and potentially plasticizers. This composite approach enables precise control of filtration efficiency and pressure drop characteristics to meet energy efficiency requirements.
2Reliability
If filter efficiency is increased to meet A+ standards, then filtration performance improves, but pressure drop increases
Solution Approach 1:
Different regions of the filter medium have different properties optimized for their specific functions. The base layer has higher porosity for low pressure drop, the filter layer has controlled fiber density and binder distribution for optimal filtration efficiency, and the cover layer provides protective functionality. This local quality differentiation allows high filtration efficiency without excessive pressure drop across the entire medium.
Solution Approach 2:
The invention controls critical parameters including glass fiber diameter distribution (bimodal or multimodal with specific ranges), binder content (5-30% by weight), basis weight (25-300 g/m²), and air permeability (≥750 L/m²sec). By precisely adjusting these parameters, the filter achieves energy efficiency class A+ with optimized balance between filtration efficiency and pressure drop.
3Reliability
If glass fibre diameter is reduced for higher filtration efficiency, then particle capture improves, but air permeability decreases
Solution Approach 1:
The invention uses a bimodal or multimodal glass fiber diameter distribution with specific mean values (0.6 μm±0.3 μm and 1.0 μm±0.3 μm) and controlled ratios (1:1 to 1:4 by weight). This parameter optimization enables efficient particle capture through diffusion and interception mechanisms while maintaining adequate air permeability (≥750 L/m²sec) for acceptable airflow rates.
Solution Approach 2:
The filter layer combines glass fibers of different diameters in specific proportions, along with chemical binders (5-30% by weight) and potentially plasticizers, to create a composite material structure. The finer fibers (0.6 μm) provide high particle capture efficiency, while the coarser fibers (1.0 μm) maintain structural integrity and air permeability, achieving energy efficiency class A+ performance.
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 proposed filter medium achieves the energy efficiency class A+ standards while maintaining suitable air permeability and filtration efficiency, compatible with existing production units and requiring minimal customization.
Implementation Method 1
the glass fibre nonwoven is consolidated by chemical binders
Implementation Method 2
a filter layer (layer 2), which is applied to at least one side of the supporting nonwoven, wherein the filter layer is constructed from glass fibres
Implementation Method 3
the parameters which essentially specify the filter are the filter efficiency and the pressure drop through the filter media
Data Source
AI summary
A filter is formed by a multilayer filter medium comprising at least one textile supporting layer, at least one filter layer which is applied to at least one side of the supporting nonwoven, wherein the filter layer is constructed from glass fibres, and at least one textile covering layer which is applied to the filter layer, wherein the filter layer comprises a mixture of at least two types of glass fibres, wherein the first glass fibre type of the mixture has a diameter of 0.6 μm±0.3 μm, and wherein the second glass fibre type of the mixture has a diameter of 1.0 μm±0.3 μm, and wherein the first and second glass fibre types of the mixture are present in a ratio by weight in the range 1:1.1 to 1:4.