{"id":6972,"date":"2021-09-13T16:10:26","date_gmt":"2021-09-13T08:10:26","guid":{"rendered":"https:\/\/palas.com.cn\/en\/?p=6972"},"modified":"2021-09-13T17:22:53","modified_gmt":"2021-09-13T09:22:53","slug":"experiment","status":"publish","type":"post","link":"https:\/\/palas.com.cn\/en\/experiment\/","title":{"rendered":"Ventilation or Filtration: How to Improve Classroom Air Quality?"},"content":{"rendered":"

Schools open again. Against the normalized COVID-19 prevention and control measures as a background, schools at home and abroad are heading towards creating a safer learning environment for students. Therefore, classroom air quality is an important topic. Recently, the German Federal Environment Agency recommended that schools and educational institutions should conduct an air quality assessment in their teaching areas to determine whether they need to purchase air purifiers or not. Palas\u00ae provides solutions for this: with PAG 1000 portable aerosol generator, and AQ Guard ambient air quality monitor, indoor aerosol concentration can be simulated and precisely measured to help make the decisions and keep students in safety.<\/p>\n

Open windows for ventilation or to use air purifiers?<\/strong><\/p>\n

The air quality of classrooms, where children come together in a limited space, cannot be overlooked. Indoor air quality is determined by the concentration of carbon dioxide and aerosols, both of which will rise over time.\u00a0 Excessive concentration of carbon dioxide will make students feel sleepy and less focused. Aerosol distribution, on the other hand, is even more critical:\u00a0 when students breathe or talk, there will be aerosol droplets in the air which they exhale. Once there is an infected student, bacteria or virus will quickly spread through droplet inhalation.<\/p>\n

\"\"
\nAt present, there are two main methods used to improve the air quality of classrooms: one is to open windows for ventilation, introducing fresh air to dilute the exhaled aerosol. The other is to use an air purifier to reduce the level of particulate matter. Which method is more effective? Palas\u00ae conducted campus fielded measurements of its PAG 1000 and AQ Guard and came up with interesting findings.<\/p>\n

\"\"<\/p>\n

Field measurements and Conclusion<\/strong><\/p>\n

The Palas\u00ae PAG 1000 used in the test can simulate different indoor aerosol concentrations by generating test aerosols. The combination of AQ Guard and PAG 1000 can monitor the change of indoor aerosol concentrations within a certain period of time.<\/p>\n

\"\"<\/p>\n

The two instruments are placed in a classroom, with the air purifiers turned on, and the windows are opened every 20 minutes for about 6-minute ventilation. Under the monitoring of AQ Guard, it can be seen that in a 40-minute class, the concentration of carbon dioxide is significantly affected by ventilation, especially in the first few minutes. And the aerosol concentration is continuously reduced by air purifiers during the class but increases with the influx of fresh air during ventilation. Experimental results show that both methods help to improve indoor air quality.<\/p>\n

\"\"
\nFurther studies have shown that once ventilation ceases, aerosol will soon fill indoor air again. Moreover, short phases of good air quality alternate with long phases of poor air quality with intermittent ventilation. The risk of infection is hardly reduced. As a result, it is more recommended to reducing the risk of infection in the classroom by opening windows during breaks or when classrooms are vacant. This also helps to avoid bringing potentially infectious air into the next class. On the other hand, air purifiers could lower the risk of infection by up to 65%. It is especially suitable for those teaching areas that cannot be effectively ventilated due to architectural structures. Nonetheless, attention must be paid to operating noise. Silent or low-noise air purifiers are more recommended.<\/p>\n

\"\"<\/p>\n


\nPalas\u00ae Technical Principles<\/strong><\/p>\n

Palas\u00ae<\/sup>\u00a0PAG 1000 portable aerosol generator can simulate real scenarios, produce harmless test aerosols to simulate aerosols emitted by human, and distribute them in the room. The average size of the particles produced by the aerosol generator should be in the range of 0.2-0.3 \u00b5m to simulate aerosol particles exhaled by people and avoid a decrease in concentration due to sedimentation. Once the target concentration reaches, AQ Guard will measure the aerosol concentration. AQ Guard can measure aerosols and carbon dioxide concentrations simultaneously, detect the risk of infection and evaluate indoor air quality.<\/p>\n

PAG 1000 Portable Aerosol Generator<\/strong><\/p>\n

\"\"<\/p>\n

Advantages:<\/strong><\/p>\n

\u00b7\u00a0 \u00a0 \u00a0 \u00a0Small, portable
\n\u00b7\u00a0 \u00a0 \u00a0 \u00a0Easiest handling
\n\u00b7\u00a0 \u00a0 \u00a0 \u00a0Fast responding qualities
\n\u00b7\u00a0 \u00a0 \u00a0 \u00a0Internal pump for autonomous operation
\nParticle size distribution and concentration<\/p>\n

\u00b7\u00a0 \u00a0 \u00a0 \u00a0Wide setting range by high-\/low-switching
\n\u00b7\u00a0 \u00a0 \u00a0 \u00a0Highest stability even for very low concentrations
\n\u00b7\u00a0 \u00a0 \u00a0 \u00a0Best reproducibility<\/p>\n

\u00b7\u00a0 \u00a0 \u00a0 \u00a06 h of operating time in battery mode
\n\u00b7\u00a0 \u00a0 \u00a0 \u00a0Robust, long-living, low-maintenance
\n\u00b7\u00a0 \u00a0 \u00a0 \u00a0Cost-effective<\/p>\n

Applications:<\/strong><\/p>\n

\u00b7\u00a0 \u00a0 \u00a0 \u00a0Test of Laminar-Flow-Boxes
\n\u00b7\u00a0 \u00a0 \u00a0 \u00a0Clean room acceptance test
\n\u00b7\u00a0 \u00a0 \u00a0 \u00a0Recovery test
\n\u00b7\u00a0 \u00a0 \u00a0 \u00a0Smoke detector test
\n\u00b7\u00a0 \u00a0 \u00a0 \u00a0HEPA\/ ULPA filter testing
\n\u00b7\u00a0 \u00a0 \u00a0 \u00a0Laboratory applications
\n\u00b7\u00a0 \u00a0 \u00a0 \u00a0Flexible aerosol supplies on side<\/p>\n

AQ Guard Ambient Air Quality Monitor<\/strong><\/p>\n

\"\"
\n\"\"<\/p>\n

Adavantages:<\/strong><\/p>\n

\u00b7\u00a0 \u00a0 \u00a0 \u00a0Technology based on the type-approved Fidas\u00ae 200 series (EN16450 and MCERTS)
\n\u00b7\u00a0 \u00a0 \u00a0 \u00a0Simultaneous measurement of Cn, PM1, PM2.5, PM4, PM10, TSP, CN, etc.
\n\u00b7\u00a0 \u00a0 \u00a0 \u00a0High accuracy with advanced algorithms
\n\u00b7\u00a0 \u00a0 \u00a0 \u00a0Long term stability thanks to self-calibration for measurement of flow rate, particle size channels, and gaseous pollutants
\n\u00b7\u00a0 \u00a0 \u00a0 \u00a0Operates on AC, DC, or power-over-Ethernet<\/p>\n

Applications<\/strong>\uff1a<\/strong><\/p>\n

\u00b7\u00a0 \u00a0 \u00a0 \u00a0Industry: Production processes, bulk material handling (mixing, discharge, storage, packaging, etc.), fenceline monitoring
\n\u00b7\u00a0 \u00a0 \u00a0 \u00a0Construction sites: Roads, railroads, demolition sites
\n\u00b7\u00a0 \u00a0 \u00a0 \u00a0Buildings: Schools, kindergartens, hospitals, hotels, offices, public service buildings
\n\u00b7\u00a0 \u00a0 \u00a0 \u00a0Residential buildings near construction sites or other polluted areas
\n\u00b7\u00a0 \u00a0 \u00a0 \u00a0Public transportation: Airports, train stations, tramway & underground stations, cruise ships, passenger cabins such as in tram and train<\/p>\n

Palas\u00ae China will arrange a series of online webinars both in English and Chinese for Ambient air quality continuous monitoring system, Palas SMPS scanning mobility particle sizer, Palas Promo & Aerosol Generator & Dilution system, ISO 16890 filter media tester, Palas MFP 3000 G, ISO 29463-3 filter media tester, Palas MFP Nano plus 4000, ISO 17536 Fractional filtration efficiency tester of Oil Mist Separator, Palas HMT 1000, as well as Particle Distribution Measurement Devices Introduction – Optical Scattering Method and many other solutions. If interested in the webinars for our products, you are more than welcome to register on our official website and get the latest webinar plan!<\/p>\n

Register online now to participate in our webinars if interested<\/a><\/p>\n

\"\"<\/p>\n","protected":false},"excerpt":{"rendered":"

Palas\u00ae instruments simulate and measure aerosol concentration, helping experts assess the air quality of classrooms accurately.<\/p>\n","protected":false},"author":2,"featured_media":6973,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[376],"tags":[],"_links":{"self":[{"href":"https:\/\/palas.com.cn\/en\/wp-json\/wp\/v2\/posts\/6972"}],"collection":[{"href":"https:\/\/palas.com.cn\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/palas.com.cn\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/palas.com.cn\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/palas.com.cn\/en\/wp-json\/wp\/v2\/comments?post=6972"}],"version-history":[{"count":3,"href":"https:\/\/palas.com.cn\/en\/wp-json\/wp\/v2\/posts\/6972\/revisions"}],"predecessor-version":[{"id":6986,"href":"https:\/\/palas.com.cn\/en\/wp-json\/wp\/v2\/posts\/6972\/revisions\/6986"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/palas.com.cn\/en\/wp-json\/wp\/v2\/media\/6973"}],"wp:attachment":[{"href":"https:\/\/palas.com.cn\/en\/wp-json\/wp\/v2\/media?parent=6972"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/palas.com.cn\/en\/wp-json\/wp\/v2\/categories?post=6972"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/palas.com.cn\/en\/wp-json\/wp\/v2\/tags?post=6972"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}