久久久无码人妻精品无码_6080YYY午夜理论片中无码_性无码专区_无码人妻品一区二区三区精99

US EUROPE AFRICA ASIA 中文
Business / Green China

University unveils new air purifier technology

By WANG HONGYI in Shanghai (China Daily) Updated: 2014-01-07 01:07

University unveils new air purifier technology

A member of the Shanghai Jiao Tong University research team that invented a new air-purifying device demonstrates the machine. The device’s technology can prevent secondary pollution that existing air purifiers can create if not used properly. Du Xin / for China Daily

Innovation removes pollutants by electrostatic and catalytic processes

Chinese researchers have developed a new technology to clean up indoor air pollution that avoids secondary pollution that existing air purification products in the market can create if used improperly.

The new air purifier, developed by a research team from the School of Mechanical Engineering at Shanghai Jiao Tong University, removes indoor pollutants from air through physical and chemical methods.

Professor Shangguan Wenfeng, who led the research project, said at a news conference on Monday that current air purifiers clean the air mainly by absorption and filtering, but this technique has problems.

“For example, the filter needs to be replaced regularly because it will easily reach the saturation point, which might lead to further pollution,” he said.

Also, while some machines cannot filter smaller pollutants well, the school’s new technology overcomes that shortcoming, he said.

The new technology removes indoor pollutants through high-voltage electrostatic and catalytic purification.

The electrostatics process the PM2.5 — airborne particles smaller than 2.5 micrometers that can go deep into the lungs — and other air pollutants from outdoors.

During this process, volatile organic compounds and a small amount of ozone are produced. The second, catalysis module transforms these harmful organic compounds and ozone into harmless carbon dioxide and water.

A test was conducted during the news conference. Because Shanghai air quality was classified as “good” at the time, researchers made a smoggy indoor environment in a 30-square-meter room by lighting six cigarettes. The PM2.5 reading soon reached 700 micrograms per cubic meter, far exceeding the index limit level of 500.

When the machine was switched on, the particles in the room gradually disappeared, with the reading less than 100 within an hour.

Another innovation of the air purifier is that it allows air circulation between indoors and outdoors. Indoor air is circulated with outside air through a ventilation pipe at the bottom of the machine.

“Even in heavy smoggy weather, the indoor air will continue circulating and be cleaned. This technology is not available in existing machines on the market,” Shangguan said.

Yang Xin, an environmental expert at Fudan University, expressed optimism about the invention.

“In recent years, air cleaners have become more and more popular among residents. A well-designed air purifier will undoubtedly play an important role in improving air quality,” he said.

Poor air quality has been heatedly discussed by the public recently as smog enveloped many cities in autumn and winter. PM2.5 has become the country’s primary polluter and also the main source of indoor air pollution.

In Beijing, the average PM2.5 reading in 2013 was more than double the national standard, according to a Beijing Environmental Protection Bureau report earlier this month.

On average, heavy air pollution occurred every six or seven days in the city, said Zhang Dawei, director of the Beijing Environmental Monitoring Center.

Shanghai, a city whose air was once considered clean, saw its Air Quality Index reach nearly 500 on Dec 6. An index reading over 300 is considered “hazardous”, the highest in a six-tier rating system of air quality.

Persistent smog across the country has prompted a surge in sales of dust masks and air cleaners. Sales of air-cleaning machines in 2013 increased 420 percent year-on-year, according to JD.com, China’s e-commerce giant.

“So far, this technology is very developed, and it has already been awarded a patent. We are now looking for manufacturers to help bring this product to market,” Shangguan said.

The research team said the retail price of the new air purifier would be competitive with similar machines on the market from big international brands like Blueair, Daikin, Philips and Siemens. The price is expected to be 3,000 yuan ($496) to 6,000 yuan depending on the size of the room it’s used for. 

Hot Topics

Editor's Picks
...
久久久无码人妻精品无码_6080YYY午夜理论片中无码_性无码专区_无码人妻品一区二区三区精99

    艹b视频在线观看| 国产亚洲天堂网| 免费无码av片在线观看| 污污视频在线免费| 国产精品免费入口| 男人天堂成人网| 91av在线免费播放| 欧美乱做爰xxxⅹ久久久| 男女男精品视频站| 成人性免费视频| 三年中文高清在线观看第6集| 久久久噜噜噜www成人网| 韩国黄色一级大片| 亚洲人视频在线| 欧美三级午夜理伦三级| 国产尤物av一区二区三区| 亚洲欧美日韩精品一区| 成年人网站大全| 你懂的av在线| 久久综合久久久久| 国产欧美综合一区| 日韩av片免费观看| 在线免费视频a| 欧美成人精品欧美一级乱| www.xxx麻豆| 777久久精品一区二区三区无码| 成人av毛片在线观看| 九九热免费精品视频| 国产av无码专区亚洲精品| 日本人体一区二区| 800av在线免费观看| 丰满女人性猛交| 自拍一级黄色片| 五月天丁香花婷婷| 国产成年人视频网站| 在线免费视频一区| 久草综合在线观看| 国产精品人人妻人人爽人人牛| 男人天堂网视频| 凹凸国产熟女精品视频| 黄色av网址在线播放| 国产自产在线视频| 成年女人18级毛片毛片免费| 国内精品国产三级国产99| 国产成人精品免费看在线播放 | 中文字幕资源在线观看| 久久这里只精品| 色戒在线免费观看| av噜噜在线观看| 吴梦梦av在线| 女同性恋一区二区| 久久这里只有精品8| 农民人伦一区二区三区| 99精品在线免费视频| 久久综合九色综合88i| 日本中文字幕网址| 欧美牲交a欧美牲交| 久久久999视频| 日韩精品一区二区三区不卡| 国产精品拍拍拍| 人人爽人人爽av| avove在线观看| 丰满的少妇愉情hd高清果冻传媒| 无罩大乳的熟妇正在播放| 日韩欧美精品在线观看视频| 五月婷婷深爱五月| 蜜臀一区二区三区精品免费视频| 亚洲第一精品区| 成人小视频在线观看免费| 日韩av一二三四区| 玩弄japan白嫩少妇hd| 邪恶网站在线观看| 丰满女人性猛交| 激情深爱综合网| www.日本xxxx| 秋霞在线一区二区| 国产精品自拍片| 鲁一鲁一鲁一鲁一av| 91免费视频黄| 国产视频九色蝌蚪| 久久人人爽av| 男人的天堂avav| 一区二区三区国产免费| 欧美日韩在线免费观看视频| 69sex久久精品国产麻豆| 久久久久国产精品熟女影院| 国产高清免费在线| 国产九九九九九| 日本一二区免费| 夜夜添无码一区二区三区| 9久久婷婷国产综合精品性色| 免费在线精品视频| 国产精品97在线| 国产精品无码乱伦| 精品人妻一区二区三区四区在线 | 在线视频日韩一区| 日本高清xxxx| 免费日韩视频在线观看| 久久久久久久久久毛片| 69堂免费视频| 亚洲女人在线观看| 大陆极品少妇内射aaaaa| 天天久久综合网| 日韩免费毛片视频| 国产一二三四区在线观看| 国产视频一区二区三区在线播放| 热久久最新地址| 杨幂毛片午夜性生毛片| 国产高清www| 日本精品一区在线| 免费黄色福利视频| 国产女人18毛片| 另类小说第一页| 欧美 日韩 亚洲 一区| 亚洲一区二区图片| 欧美精品无码一区二区三区| 中国丰满熟妇xxxx性| 在线播放黄色av| 免费大片在线观看| 高清欧美精品xxxxx| 欧美日韩一级在线| jizz欧美性11| 欧美成人免费高清视频| 久久国产精品网| 天天操天天干天天玩| av中文字幕网址| 午夜免费精品视频| 欧美二区在线视频| 欧美中日韩在线| 裸体大乳女做爰69| 在线播放免费视频| 中文字幕网av| 国产成人精品无码播放| 水蜜桃色314在线观看| 国产免费内射又粗又爽密桃视频| 手机在线国产视频| 高潮一区二区三区| 欧美两根一起进3p做受视频| 18岁网站在线观看| 九色自拍视频在线观看| 97免费视频观看| 91国在线高清视频| 特黄特黄一级片| 午夜精品免费看| 国产乱女淫av麻豆国产| 国产美女18xxxx免费视频| 欧美精品aaaa| 国产aaaaa毛片| 免费日韩视频在线观看| 日韩少妇内射免费播放18禁裸乳| xxxx18hd亚洲hd捆绑| 国产无限制自拍| 成人黄色av片| 免费成人午夜视频| 亚洲乱码中文字幕久久孕妇黑人| 欧美三级在线观看视频| 97国产精东麻豆人妻电影| 精品国产一区二区三区无码| 国产成人艳妇aa视频在线 | www.日本久久| 夜夜爽久久精品91| 欧美日韩在线免费观看视频| 男女激烈动态图| 国产尤物av一区二区三区| 欧美一区二区激情| 国产免费黄色小视频| 丰满少妇被猛烈进入高清播放| 精品国产一区三区| 免费欧美一级视频| 无需播放器的av| 色婷婷激情视频| 性做爰过程免费播放| 欧美黑人在线观看| 美女日批免费视频| 日本精品久久久久中文字幕| 日韩av卡一卡二| 天天成人综合网| 国产91沈先生在线播放| 欧洲精品一区二区三区久久| 高清在线观看免费| 五月婷婷激情久久| 国产精品999.| 妞干网视频在线观看| 久久久久久久久久久久久国产精品| 一区二区三区免费播放| www.欧美激情.com| 欧美精品卡一卡二| 成年人免费在线播放| 欧美日韩中文不卡| 日本成人在线不卡| 久久久999视频| 蜜臀一区二区三区精品免费视频 | 亚洲欧美天堂在线| 国产精品一二三在线观看| 极品美女扒开粉嫩小泬| 免费涩涩18网站入口| 在线观看av的网址| 黄色国产精品视频| 婷婷视频在线播放| 黄色影院一级片|