On 2 June 2019, the United Nations Environment Programme (UNEP) said that China's remarkable achievements in air governance are worth learning from other developing countries to take over. International Online News (China Radio International reporter Yang Qiong): World Environment Day is approaching, and the theme of this year's World Environment Day is tackling air pollution, with the global main event to be held in Hangzhou, Zhejiang Province, China. Ms Joyce Msuya, Acting Executive Director of the United Nations Environment Programme, said in a recent interview that China has made great progress in combating air pollution, which provides developing countries with experience that can be learnt from.
In 2015, a public-interest documentary film, "Chai Jing's Investigation: Under the Dome", was broadcast and became a sensation for the whole nation. The large-scale air pollution in-depth public welfare investigation conducted by the CCTV departed host Chai Jing, visited a number of pollution sites to find the root cause of the haze, and multi-country field filming of the experience of pollution control. This investigation on haze, is considered "non-agency, non-journalists do the most authoritative sources, the most three-dimensional information, the most open vision, the most abundant means, the most sense of action haze investigation. From this, China began to run on the road of air management, and achieved better results.
With the improvement of the domestic environment of air governance, people are also increasingly concerned about the family / personal air environment, although second-hand smoke, carbon dioxide, TVOC, formaldehyde and so on often appear around us, but for the family / personal air quality monitoring and management, the market has been very mature programme. Today I will provide you with an in-depth analysis of air quality monitoring and management from a technical point of view.
Air Quality Monitoring
The most common solution for air quality monitoring is the Air Quality Box, which can detect indoor PM2.5, carbon dioxide, formaldehyde, TVOC, temperature and humidity in real time, and intelligently link with the smart home to create a healthy and green home environment.
PM2.5 sensor: Its working principle is that the laser irradiation on the suspended particles in the air produces scattering, while the receiving tube collects the scattered light at a specific angle, and gets the curve of the scattered light intensity change with time. It can continuously collect and calculate the number of suspended particles of different sizes in the air per unit volume, i.e. the concentration distribution of particles, which is then converted into mass concentration by the microprocessor based on the algorithm of Mie (MIE) theory.
Carbon dioxide concentration sensor: its working principle is to determine the intensity and wavelength of infrared light irradiation into the air, the carbon dioxide in the air is absorbed by the receiver tube by detecting the intensity of the absorbed infrared light to output the corresponding electrical signal. The receiver tube outputs the corresponding electrical signal by detecting the intensity of the absorbed infrared light. The sensor internally filters and amplifies the electrical signal, and the microprocessor calculates the concentration of carbon dioxide in the air through an algorithm.
Formaldehyde sensor: electrochemical formaldehyde sensor using the principle of electrochemical control of potentiodynamic electrolysis, using a two-electrode system and the use of the gas to be measured in the electrolyte electrolyte working electrode electrochemical oxidation process generates current, the size of the current generated by the remaining concentration of formaldehyde is directly proportional to the determination of the size of the current can be measured by the concentration of formaldehyde.
TVOC sensor: semiconductor-type TVOC sensor using as a substrate, coated with semiconductor material SnO2 on the ceramic heater and doped with trace elements constitute a formaldehyde, benzene, ammonia, alcohol, cigarette smoke and other organic volatile gases have a high degree of sensitivity.
Temperature sensor: its working principle is built-in thermistor, its resistance value with the temperature of a specific change, and the resistance value can be used directly as an output signal to calculate the temperature.
Humidity Sensor: Its working principle is to cover a layer of membrane made of moisture-sensitive material on the substrate, when the water vapour in the air is adsorbed on the moisture-sensitive membrane, the resistivity and the resistance value of the element change, and the humidity can be measured by using this characteristic.
Air quality management
After the completion of air quality monitoring, while linkage air quality management, the more common programme is to use the start humidifier atomisation cooling moisturising, reduce PM2.5, TVOC, formaldehyde in the air; start fresh air, ventilation fan to discharge indoor carbon dioxide exceeds the standard air, replace the fresh air; turn on the aromatherapy machine to manage the indoor ambience, the indoor air will be adjusted to a healthy and comfortable range.
Humidification / Aromatherapy Atomisation: Its working principle is to generate high frequency oscillation in the thickness direction by piezoelectric ceramic oscillator, water molecules receive strong ultrasonic energy is torn into micro water droplets, overflow and form atomisation on the surface, water atomisation will combine the suspended particulate matter in the air, formaldehyde and VOC, so that the pollutants will be quickly precipitated, so as to achieve cooling and moisturising, reduce PM2.5, formaldehyde and VOC and other pollutants in the air Effect.
Fresh air ventilation: its working principle is to use the total heat exchanger will be discharged indoor dirty air and outdoor fresh air sent in both through the heat transfer plate to exchange temperature, but also through the plate on the exchange of humidity microporous, so as to achieve the effect of ventilation and air exchange, can quickly and effectively reduce indoor carbon dioxide, PM2.5, formaldehyde and VOC and other pollutants.
Aromatherapy air pump: its working principle is through the precision ultrasonic air pump in the airtight cavity to generate the pressure, the use of air energy in the essential oil liquid to stimulate bubbles, without the need to add other liquids to dilute, to maintain the purity of essential oils, so that essential oil molecules are active in the diffusion, thus forming the effect of air diffusion.
The 5th of June is World Environment Day. Since 1974, World Environment Day has become a public platform for people in more than 100 countries to actively participate in environmental protection actions. World Environment Day, which reflects the awareness and attitude of the world's people towards environmental issues, expresses mankind's aspiration and pursuit of a better environment.
As a domestic air quality monitoring and management expert, Audiowell has invested a lot of research in air quality monitoring to management, and the products/programmes such as PM2.5 sensor, carbon dioxide sensor, humidification and atomization, aromatherapy air pump, etc. are all fed with digital information to achieve intelligent linkage work from monitoring to management, providing highly integrated, stable and intelligent air quality monitoring and management for people's quality of living at home. programme for people's quality of life at home.
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