مقالات
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Airborne microorganisms play a significant role in the transmission of infectious diseases. As such, improving indoor microbial air quality can enhance infection control in numerous settings. This study examined the efficacy of the PlasmaShield® air purification device to remove airborne microorganisms under laboratory conditions. Pure cultures of model microorganisms at varying concentrations were aerosolized using a 1-jet Collison nebulizer through stainless-steel removable piping prior to reaching the PlasmaShield® device. The surviving microorganisms were captured using the Staplex® MBS-6 Six Stage Microbial Air Sampler and enumerated via culture on agar plates. The positive-hole-corrected colony/plaque-forming units were compared with the negative control (microorganisms aerosolized through an empty PlasmaShield® casing). The PlasmaShield® statistically significantly (p < 0.05) reduced airborne Escherichia coli, Staphylococcus epidermidis, Bacteriophage MS2 and Cladosporium sp. compared with the negative control. The maximum removal achieved was estimated to be 4 × log10 E. coli (99.99% removal), 4 × log10 S. epidermidis (99.97% removal), 7 × log10 MS2 (99.99998% removal) and 5 × log10 Cladosporium sp. (99.999% removal). Scanning electron microscope images of the surviving microorganisms showed that the PlasmaShield® damaged the cell membrane of these model microorganisms. This study provides proof-of-concept evidence to support the use of this technology to improve indoor microbial air quality.
The efficacy of the PlasmaShield device to inactivate aerosolised HCoV229E virus was tested. Purified HCoV229E, at a concentration of 1.93 x 108 TCID50/mL in PBS, was nebulised for 3 min through 21.5 cm of piping prior to the PlasmaShield and 21.5 cm piping after the PlasmaShield. For the baseline/negative control measurement, the PlasmaShield was replaced with an empty case. Surviving virus aerosols were collected in a liquid impinger sampler. The virus concentration was then determined by infectivity of Huh-7 cells and the TCID50/mL calculated. All experiments were conducted in triplicate. The baseline experiment (empty PlasmaShield case) detected 7.85 x 106 TCID50/mL HCoV229E. This was reduced by approximate a 1.5 x log10 (95% reduction) to 3.9 x 105 TCID50/mL HCoV229E with the PlasmaShield turned on.
Experiments were conducted to measure the particle collection and removal efficiencies of a non-thermal plasma air filtration system (PFS). This system utilises a uniform and high intensity electric field to produce low-medium energy electrons, which in turn can charge particulate matter (PM) that passes through the field, potentially causing them to agglomerate and be more readily captured by conventional porous media filters. The experiments comprised of single-pass efficiency measurements and smoke recovery tests, where in both cases the particle count across the size range of 0.3 µm to 10 µm was measured. The results show that when the PFS is paired with a conventional MERV13 post-filter, the particle collection efficiencies exceeded 99.95% for all measured particle sizes for filter face velocities < 1 m/s. When the post-filter was removed, the minimum efficiencies reduced to 76.98%. The results also show that the PFS set
at a flow-rate of 30 ach removed 99.8% of the smoke introduced into the room within 15 minutes.
Final Technical Report
In a previous Interim Report (AESHDP0122), Adelaide Exposure Science and Health (University of Adelaide) reviewed selected experimental data pertaining to the PlasmaShield Air Purification System (PAPS) and provided commentary on air purification from an occupational hygiene perspective. This report presents findings from an independent empirica
این فناوری عملکردی بی‌مانند در فیلتراسیون، تصفیه و ضدعفونی هوا دارد و با ارتقا کیفیت هوای داخل، ایمنی و اطمینان را برای ساکنین و بهره‌برداران به همراه می‌آورد. پس از همهگیری بیماری مهلک کرونا (Covid-19) ضرورت توجه به مقوله کیفیت هوای داخل ساختمان‌ها جدی گشت و امروز شاهد آن هستیم که استاندارد اشری (ASHRAE) آمریکا به عنوان سرآمدترین استاندارد گرمایش، سرمایش وتهویه مطبوع هوا برای ساختمان‌ها اقدام به انتشار نخستین استاندارد برای کنترل عفونت ناشی از قطرات ریز تنفسی (Control of Infection Aerosols / ASHRAE Standard 241-2023) در مراکز درمانی، عمومی، تفریحی، تجاری، خدمانی، آموزشی، صنعتی و مسکونی نمود. هدف این استاندارد ایجاد حداقل الزامات برای کنترل آئروسلهای عفونی به منظور کاهش خطرانتقال بیماری است.
A desktop analysis on the potential of Plasma Shield’s air purification system (PSS) to allow for a reduction in outside (“fresh”) air requirements based on Australian Standards 1668.2 – 2012, and the resultant energy savings that could potentially be realised, has been conducted under simplified conditions relevant to commercial office buildings. This analysis also includes a discussion on the amount of points that could potentially be awarded through the use of the PSS under different rating schemes, namely Green Building Council of Australia’s Green Star scheme and the international WELL Building Standard.
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راه‌کارهای متنوع
ارائهٔ سیستم‌های لوله‌کشی، سرمایش، گرمایش و تهویه مطبوع، ساخت‌وساز خشک، درب، پنجره و نما، مواد آب‌بندی بتن و مصالح شیمیایی ساختمان و سیستم‌های تهویه و ضدعفونی هوا، بخشی از راه‌کارهای متنوع ره‌آورد فن‌آوری است.
دفتر تهران
تهران، قلهک، خیابان شریعتی، کوچه یزدانیان، پلاک ۲۶، واحد ۳
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۲۲۶۱۲۵۰۰ - ۰۲۱
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