What is the impact of the porosity of the ePTFE membrane on the energy consumption of the air filtration system?

1. Balance between filtration efficiency and energy consumption:
When the porosity of the ePTFE membrane is high, it can provide better air permeability, which means that in the air filtration system, the resistance of the airflow through the membrane is small, thereby reducing the energy consumption of the system. High air permeability and high interception efficiency enable the vacuum cleaner to not only effectively intercept wind dust particles, but also keep the vacuum cleaner at a low energy consumption.
2. Filtration resistance:
The filtration resistance is mainly concentrated on the filter cake layer formed on the surface of the filter material. The structural parameters of the ePTFE membrane, such as pore size, porosity, and thickness, have basically no effect on the structure of the filter cake layer, while the size of the dust particles has a significant effect on the structure of the filter cake layer and its filtration pressure drop. Different porosities may affect the formation of the filter cake layer, and then affect the filtration resistance and energy consumption.
3. Dust holding performance:
The dust holding performance of the ePTFE membrane filter material is not as good as that of the glass fiber filter material, and it is more suitable for use in places with regeneration or pre-filtration devices. This means that the ePTFE membrane may need to be cleaned or replaced more frequently, which increases energy consumption and maintenance costs to a certain extent.
4. Filtration accuracy and energy consumption:
The filtration accuracy of ePTFE membrane can reach U15 level (99.9995%) or above, and even reach U17 level (99.999995%), which can fully meet the purification requirements of high-precision electronic product processing workshops such as semiconductors and chips. High filtration accuracy usually means higher filtration resistance, which may lead to increased energy consumption. However, the high porosity of ePTFE membrane helps to reduce this resistance, thereby reducing energy consumption.
5. Effect of heat treatment on porosity:
Heat treatment can reduce the maximum pore size, average pore size and porosity of ePTFE microporous membrane, and has a retention rate of nearly 100% for nanoparticles suspended in organic solvents. This treatment to reduce porosity may increase filtration resistance and thus increase energy consumption.