RHELP (Regenerative High Efficiency Low Pressure) Air Purification System

2009 ◽  
Author(s):  
Chang-Yu Wu ◽  
Brian Damit ◽  
Qi Zhang ◽  
Myung-Heui Woo ◽  
Wolfgang Sigmund ◽  
...  
Keyword(s):  
High Efficiency ◽  
Low Pressure ◽  
Air Purification ◽  
Purification System

scholarly journals Removal of SARS-CoV-2 bioaerosols using ultraviolet air filtration

2021 ◽  
pp. 1-2
Author(s):  
Roy E. Barnewall ◽  
Werner E. Bischoff
Keyword(s):  
High Efficiency ◽  
Test Organism ◽  
Air Purification ◽  
Controlled Environment ◽  
Air Filtration ◽  
Engineering Controls ◽  
Purification System ◽  
Novel Approaches ◽  
Respiratory Coronavirus ◽  
Uv C

Abstract Engineering controls play an important role in reducing the spread of severe acute respiratory coronavirus virus 2 (SARS-CoV-2).1 Established technologies such as air filtration, and novel approaches such as ultraviolet (UV)-C light or plasma air ionization, have the potential to support the fight against the coronavirus disease 2019 (COVID-19) pandemic.2 We tested the efficacy of an air purification system (APS) combining UV-C light and high-efficiency particulate air (HEPA) filtration in a controlled environment using SARS-CoV-2 as test organism. The APS successfully removed the virus from the air using UV-C light by itself and in combination with HEPA air filtration.

Slip effect based bimodal nanofibrous membrane for high-efficiency and low-resistance air purification

2021 ◽  
pp. 119258
Author(s):  
Zhenzhen Quan ◽  
Yao Zu ◽  
Yihan Wang ◽  
Mengjuan Zhou ◽  
Xiaohong Qin ◽  
...  
Keyword(s):  
High Efficiency ◽  
Nanofibrous Membrane ◽  
Air Purification ◽  
Slip Effect ◽  
Low Resistance

Development of a New Design Method for High Efficiency Swept Low Pressure Axial Fans With Small Hub/Tip Ratio

2014 ◽  
Author(s):  
Thore Bastian Lindemann ◽  
Jens Friedrichs ◽  
Udo Stark
Keyword(s):  
High Efficiency ◽  
Design Method ◽  
Tangential Velocity ◽  
Pressure Rise ◽  
Low Pressure ◽  
Aerodynamic Performance ◽  
Low Noise ◽  
Angle Distribution ◽  
Sweep Angle ◽  
Reduced Pressure

For a competitive low pressure axial fan design low noise emission is as important as high efficiency. In this paper a new design method for low pressure fans with a small hub to tip ratio including blade sweep is introduced and discussed based on experimental investigations. Basis is an empirical axial and tangential velocity distribution at the rotor outlet combined with a distinctive sweep angle distribution along the stacking line. Several fans were designed, built and tested in order to analyze the aerodynamic as well as the aeroacoustic behavior. For the aerodynamic performance particular attention was paid to compensate the influence of reduced pressure rise and efficiency due to increasing blade sweep. This was achieved by a method of increasing the blade chord depending on the local sweep angle which is based on single airfoil data. The tested fans without this compensation revealed a significant noise reduction effect of up to approx. 6 dB(A) for a tip sweep angle of 64° which was accompanied by an unsatisfactory effect of reduced overall aerodynamic performance. The second group of fans did not only confirm the method of the aerodynamic compensation by a nearly unchanged pressure rise and efficiency characteristic but also revealed an increased aeroacoustic benefit of in average 9.5 dB(A) compared to the unswept version. Beside the overall characteristics the individual differences between the designs are also discussed using results of wall pressure measurements which show some significant changes of the blade tip flow structure.

Experimental estimation of the efficiency of removing residual amounts of antibiotics and steroid hormones from water with home water purification systems

2021 ◽  
pp. 9-15
Author(s):  
Ю.А. Ремизова ◽  
А.П. Голованова ◽  
Д.А. Рудакова ◽  
А.Г. Митилинеос
Keyword(s):  
Water Purification ◽  
High Efficiency ◽  
Tap Water ◽  
Pharmaceutical Compounds ◽  
Model Solution ◽  
Capital Costs ◽  
Water Purification System ◽  
Purification System ◽  
Household Water ◽  
Purification Methods

Для удаления остаточных количеств фармацевтических соединений, присутствующих в питьевой воде, на всех этапах водоподготовки могут применяться разнообразные способы очистки, основанные на различных физико-химических принципах. В работе приведены результаты экспериментального исследования эффективности удаления с помощью бытовой стационарной системы водоочистки остаточных количеств фармацевтических препаратов – антибиотика левомицетина (хлорамфеникола) и стероидного гормона эстрона – из модельного раствора, приготовленного на основе водопроводной воды с добавлением лекарственных препаратов. Показано, что бытовая система водоочистки обладает способностью существенно снижать остаточные концентрации фармацевтических препаратов левомицетина и эстрона на всем протяжении заявленного производителем ресурса. В секторе бытовой водоочистки установки адсорбционного типа по-прежнему остаются наиболее востребованным типом водоочистных систем, обеспечивающих высокую эффективность удаления различных загрязнителей при минимальных капитальных затратах. To remove residual amounts of pharmaceutical compounds present in drinking water, a variety of purification methods based on various physicochemical principles can be used at all stages of water treatment. The paper presents the results of an experimental study of the efficiency of removing residual concentrations of pharmaceuticals – laevomycetin antibiotic (chloramphenicol) and estrone steroid hormone – from a model solution prepared on the basis of tap water with the addition of drugs, using a home fixed water purification system. It is shown that the home water purification system provides for the significant reduction of residual concentrations of chloramphenicol and estrone throughout the service life declared by the manufacturer. In the household water purification sector, adsorption-type units are still the most in-demand type of water purification systems that provide for the high efficiency in removing various pollutants with minimal capital costs.

Development of composite filters with high efficiency, low pressure drop, and high holding capacity PM2.5 filtration

2019 ◽  
Vol 212 ◽  
pp. 699-708 ◽  
Author(s):  
De-Qiang Chang ◽  
Chi-Yu Tien ◽  
Chien-Yuan Peng ◽  
Min Tang ◽  
Sheng-Chieh Chen
Keyword(s):  
Pressure Drop ◽  
High Efficiency ◽  
Low Pressure

IMPROVEMENT OF COMPLEX HEAT-RECOVERY SYSTEMS FOR GAS-FIRED BOILER UNITS

2017 ◽  
Author(s):  
Nataliia Fialko ◽  
◽  
Raisa Navrodska ◽  
Georgii Gnedash ◽  
Svitlana Shevchuk ◽  
...  
Keyword(s):  
Heat Recovery ◽  
High Efficiency ◽  
Boiler House ◽  
Technical Solution ◽  
Raw Water ◽  
Water Purification System ◽  
Purification System ◽  
Recovery System ◽  
Boiler Units ◽  
Chemical Water

The calculation and analysis of the complex heat-recovery system for heating by warmth of exhaust-gases from a boiler unit several heattransfer agents for the needs of the boiler house, namely, return heat-network water, combustion air and raw water for chemical water-purification system have been carried out. Results of researches have confirmed high efficiency of the offered technical solution.

Large-scale preparation of micro-gradient structured sub-micro fibrous membranes with narrow diameter distributions for high-efficiency air purification

2019 ◽  
Vol 6 (12) ◽  
pp. 3560-3578 ◽  
Author(s):  
Mengjuan Zhou ◽  
Mengzhen Fang ◽  
Zhenzhen Quan ◽  
Hongnan Zhang ◽  
Xiaohong Qin ◽  
...  
Keyword(s):  
Free Surface ◽  
Large Scale ◽  
High Efficiency ◽  
Air Purification ◽  
Air Filters ◽  
Large Scale Preparation ◽  
Free Surface Electrospinning ◽  
One Step ◽  
Scale Preparation ◽  
Fibrous Membranes

Micro-gradient structured PAN sub-micro fibrous membrane with high-efficiency air purification performance was fabricated via one-step free surface electrospinning with large-scale yield, firstly demonstrated as air filters.

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