Is indoor air just enough to purify?

What are the requirements for good indoor air? No dust? No PM2.5? Another important factor that most people overlook is that the air must be “fresh”. According to the "China Construction Air Conditioning Fresh Air Ventilation Frequency Standard", the average apartment needs to be ventilated 0.4-0.7 times per hour without smoking, while the office with a small number of people needs to ventilate 1.1-2.7 times per hour. Otherwise, a large amount of carbon dioxide and other exhaust gases will be deposited indoors, which will cause death in extreme cases, in addition to problems such as irritability and reduced work efficiency. In addition, the indoor air does not circulate, it is also easy to wet and breed bacteria, bringing new health risks.

Therefore, new office buildings or shopping malls will generally bother to design a new air system to ensure that indoor air circulates at a certain rate. Advanced fresh air systems also often become the capital of real estate developers to show off their peers. For example, when Pan Shiyi promoted his own Galaxy SOHO on Weibo, he pointed out: “The Galaxy SOHO's fresh air system allows people working here to breathe fresh and clean air without opening the window... The fresh air system continuously feeds the outdoor air into the air. Indoors, everyone who lives and works here feels refreshed and happy."

The problem of indoor fresh air has long been considered by real estate developers; however, the general public has not considered this. In the winter and summer season, in order to stabilize the indoor temperature, many families prefer to close the windows, turn on the electric heating or air conditioning. PM 2.5, such as Beijing, often bursts into the table. In order to prevent the outside air from entering, many people choose to close the doors and windows.

Some families did consider the “freshness” of indoor air and purchased an air purifier. However, the current quality standards for air purifiers in China do not take into account the impact of personnel activities on air quality. The test environment is also a 30 cubic meter confined space. Correspondingly, most air purifiers on the market do not take this demand into consideration, but only continuously circulate the “dead” air in the room. It is not unreasonable that some people tamper with the air purifier. The lack of ventilation function is indeed the dereliction of duty of the current air purifier.

As we all know, the ventilation should be carried out outside the pollution peaks such as the congestion time of the commuting, otherwise the pollutants in the external road air will re-enter the room. Unfortunately, the owners generally go to work during this time and cannot operate indoor air purification facilities. How to allow users to operate remotely and complete ventilation, it should also be a problem that developers of next-generation air purifiers should solve.

If an air purification device can do both, it may have a revolutionary impact on the entire industry, creating a 2.0 era of air purifiers. But designing such a device that not only can ventilate, but also can be ventilated at regular intervals is not easy. Such purifiers first require dual purification of the indoor and air that is about to enter the room. Therefore, in addition to indoor circulation, developers also need to design a system that communicates with outdoor air, which increases the workload and equipment of the original product. In addition, because the outdoor air quality is generally lower than the indoor air, the purification of the outdoor air is completed, and the requirements for the manufacturer are higher from the pure purification technology level.

In order to allow users to ventilate indoors at the right time, it is necessary to design a networked system with excellent user experience. The air purifier needs to be connected to a user's portable device (such as a mobile phone) through a WIFI or a data network, and the user can remotely control the home appliance through the client. This in turn involves Internet propositions such as smart homes, and the requirements for manufacturers are even higher, but there are not many such home appliance companies.

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