Dust Loading Performance of the PTFE HEPA Media and its Comparison with the Glass Fibre HEPA Media

Zhang, Wanyi; Deng, Shiming; Wang, Yongxiang; Lin, Zhihong

doi:10.4209/aaqr.2017.11.0481

Cited by 26 publications

(11 citation statements)

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“…In terms of filtration, numerous researchers are working on developing media with higher filtration efficiency and lower pressure drop. The dust-carrying performance and pressure drops of different media were studied by Zhang and others [112] , who found that the pressure drop of a H14 PTFE medium was about 140 to 370 Pa when the load dust mass is 0 to 6 g/m 2 , while it was about 220 to 370 Pa for a H14 glass fibre. The energy consumption of H14 glass fibre was about 1.57 times that of H14 PTFE.…”

Section: Impacts Of Hvac System Operation On Energy Consumptionmentioning

confidence: 99%

COVID-19 Impact on Operation and Energy Consumption of Heating, Ventilation and Air-Conditioning (HVAC) Systems

Zheng

Wang

et al. 2021

Advances in Applied Energy

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Heating, ventilation and air-conditioning (HVAC) system is favourable for regulating indoor temperature, relative humidity, airflow pattern and air quality. However, HVAC systems may turn out to be the culprit of microbial contamination in enclosed spaces and deteriorate the environment due to inappropriate design and operation. In the context of COVID-19, significant transformations and new requirements are occurring in HVAC systems. Recently, several updated operational guidelines for HVAC systems have been issued by various institutions to control the airborne transmission and mitigate infection risks in enclosed environments. Challenges and innovations emerge in response to operational variations of HVAC systems. To efficiently prevent the spread of the pandemic and reduce infection risks, it is essential to have an overall understanding of impacts caused by COVID-19 on HVAC systems. Therefore, the objectives of this article are to: (a) provide a comprehensive review of the airborne transmission characteristics of SARS-CoV-2 in enclosed spaces and a theoretical basis for HVAC operation guideline revision; (b) investigate HVAC-related guidelines to clarify the operational variations of HVAC systems during the pandemic; (c) analyse how operational variations of HVAC systems affect energy consumption; and (d) identify the innovations and research trends concerning future HVAC systems. Furthermore, this paper compares the energy consumption of HVAC system operation during the normal times versus pandemic period, based on a case study in China, providing a reference for other countries around the world. Results of this paper offer comprehensive insights into how to keep indoor environments safe while maintaining energy-efficient operation of HVAC systems.

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Section: Impacts Of Hvac System Operation On Energy Consumptionmentioning

confidence: 99%

COVID-19 Impact on Operation and Energy Consumption of Heating, Ventilation and Air-Conditioning (HVAC) Systems

Zheng

Wang

et al. 2021

Advances in Applied Energy

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“…High-efficiency particulate air (HEPA) filters have been used in various fields to maintain a clean air environment for industrial facilities, such as producing semiconductor and LCD panels, bio-pharmacies, and nuclear power plants [ 1 , 2 , 3 ]. In general, glass fibre has been applied to HEPA filter media.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Polytetrafluoroethylene Membrane High-Efficiency Particulate Air Filter Performance with Melt-Blown Media

Shim

Jang

Moon³

et al. 2021

Polymers

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Polytetrafluoroethylene (PTFE) membrane filters are widely used in low-load application areas, such as industrial cleanrooms, due to their low initial pressure drop. In this study, melt-blown (MB) nonwoven was introduced as a pre-filtration layer at the front end of a high-efficiency particulate air (HEPA) filter to improve the filter performance of the PTFE membrane. Pre-filtration reduces the average particle size, which reaches the PTFE membrane and reduces the dust load on the HEPA filters. A comparative analysis of the HEPA filters by composite MB and PTFE was conducted. Regarding the MB composite on the PTFE, low-weight and high-weight MB composites were effective in increasing dust filtration efficiency, and the dust loading capacity of the PTFE composite with high-weight MB increased by approximately three times that of the PTFE membrane. In addition, the filter was installed on an external air conditioner in an actual use environment and showed a high efficiency of 99.984% without a change in differential pressure after 120 days.

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“…Polynomial approximation thus appears to be more universal as it can be used to fit various loading curves more accurately. This is also obvious throughout the literature where polynomial fit is reliably used to optimize and analyze performance of filters in various applications such as airliner cabin filters [ 23 ], engine air intake [ 15 ], or evaluating the HEPA filter media [ 14 ]. Comparing the coefficients of determination (R 2 ), we can see better tightness of polynomial fit compared to the exponential.…”

Section: Resultsmentioning

confidence: 99%

“…The parameter a expresses the distance of the loading curve intersection on the y -axis from zero, which can be approximated by initial pressure drop Δ p i :

while b can be expressed from logarithmized Equation (5) and setting required conditions. The average pressure drop can also be modeled by a 4th order polynomial according to 4/11 Eurovent calculation [ 13 ] as previously used by several researchers [ 14 , 15 ]:

where v , x , y , and z are the fit parameters of the polynomial. Average pressure drop is a function of dust load and can be generally described as follows:

where M is the final amount of dust loaded.…”

Section: Analysis On Average Pressure Drop Of Air Filtersmentioning

confidence: 99%

An Assessment on Average Pressure Drop and Dust-Holding Capacity of Hollow-Fiber Membranes in Air Filtration

Bulejko

Krištof²,

Dohnal³

2021

Membranes

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In this work, we tried to analyze dust loading behavior of polypropylene hollow fiber membranes using average pressure drop models. Hollow fiber membranes varying in fiber diameter were loaded with a standardized test dust to simulate particle-polluted air. We measured pressure drop development of the membranes at different flowrates and dust concentrations, and, after each experiment, the dust deposited on the membrane fibers was weighed to obtain dust holding capacity (DHC). The obtained experimental data was analyzed using various average pressure drop models and compared with average pressure drop obtained from pressure drop/dust load dependence using a curve fit. Exponential and polynomial fitting was used and compared. Pressure drop in relation to the dust load followed different trends depending on the experimental conditions and inner fiber diameter. At higher flowrate, the dependence was polynomial no matter what the fiber diameter. However, with higher fiber diameter at lower permeate velocities, the dependence was close to exponential curve and followed similar trends as observed in planar filter media. Dust-holding capacity of the membranes depended on the experimental conditions and was up to 21.4 g. However, higher dust holding capacity was impossible to reach no matter the experiment duration due to self-cleaning ability of the tested membranes.

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Dust Loading Performance of the PTFE HEPA Media and its Comparison with the Glass Fibre HEPA Media

Cited by 26 publications

References 0 publications

COVID-19 Impact on Operation and Energy Consumption of Heating, Ventilation and Air-Conditioning (HVAC) Systems

COVID-19 Impact on Operation and Energy Consumption of Heating, Ventilation and Air-Conditioning (HVAC) Systems

Improvement of Polytetrafluoroethylene Membrane High-Efficiency Particulate Air Filter Performance with Melt-Blown Media

An Assessment on Average Pressure Drop and Dust-Holding Capacity of Hollow-Fiber Membranes in Air Filtration

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