In recent years, smog weather has increased in many parts of the country, and it has been increasing and the cycle is prolonging. The advice given by professionals is no less than going out, opening windows, wearing masks, etc. Closed doors and windows will cause indoor carbon dioxide and other polluting and harmful gases to accumulate and endanger human health. In the face of dilemma, some experts suggested adding a fresh air system to the living room. Some people are too troublesome. I think it is enough to buy an air purifier. So, what are the differences between the two devices?
The so-called fresh air, that is, fresh air, the “new air system†is the building electromechanical system that provides fresh air to the living room (building). It consists of a central new air blower (or unit with air handling functions such as air filtration and purification, heating or cooling, It is composed of three parts: humidification or dehumidification, ventilation duct and air inlet (inlet and return air), which can discharge the dirty air in the room to the outside, and filter the fresh air outside and send it indoors.
Air purifiers, also known as "air cleaners" and "air fresheners", are electrical products that can filter, adsorb or decompose various air pollutants and improve air cleanliness. The working principle is that the indoor air is circulated by a fan, and then the filter is used to filter out the pollutants, thereby purifying the air.
The difference between the two is mainly reflected in the following aspects:
Comfort
The fresh air system introduces fresh air into the room through ventilation and replenishes oxygen, thereby improving the comfort of the living space and reducing the amount of pollutants in the air. The advantage is that there is no mixing of fresh air and dirty air, and the noise is relatively small when used. The space for the fresh air system generally includes the bedroom, the living room, etc., but each space requires a separate device.
The air purifier can only circulate and purify the indoor air, and does not input fresh air from the outside into the room, so the comfort is compromised compared with the fresh air system. In addition, some air purifiers are noisy and can easily affect people's sleep when used.
2. Conditions of use
Both the fresh air system and the air purifier have their own applicable conditions, and the fresh air system is suitable for rooms that need to be ventilated but not easy to open windows. However, although it can be ventilated, it needs to be designed in the interior decoration stage. The professional requirements for design and installation are high and must be completed by professionals.
The air purifier is suitable for the room that needs to purify the air in a short time, and has many advantages such as purchasing channels, no need for professional construction and installation, and plug and play.
3. Use cost
The initial installation cost of the fresh air system is relatively high, and it needs to be designed and wired by professionals. The cost is generally calculated according to the actual indoor use area, about 200 yuan per square meter, including design, construction and purchase of fans, pipes, fittings and other expenses. . The price of the online shopping fresh air system is similar to that of the physical store, and the price of the group purchase will be lower.
The price of air purifiers varies greatly depending on the brand, ranging from a few hundred yuan to several thousand yuan. Although it cannot be generalized, the overall price is cheaper than the fresh air system. Yue Gangju
It is mainly made of a material with high pyroelectric coefficient, such as lead zirconate titanate ceramics, lithium tantalate, triglyceride titanium sulfate, etc. to make the detection element with a size of 2*1mm. Install one or two detection elements in each detector, and connect the two detection elements in series with reverse polarity to suppress the interference caused by the rise of their own temperature. The detection element converts the detected and received infrared radiation into a weak voltage signal, which is amplified by the field effect tube installed in the probe and output outward. In order to improve the detection sensitivity of the detector and increase the detection distance, a Fresnel lens is generally installed in front of the detector. The lens is made of transparent plastic. The upper and lower parts of the lens are divided into several equal parts. It is a kind of lens with a special optical system. It can amplify the signal by more than 70 decibels in cooperation with the amplifying circuit, so that the movement of people within 20 meters can be measured.
The Fresnel lens uses the special optical principle of the lens to produce an alternating "blind zone" and "high-sensitivity zone" in front of the detector to improve its detection and reception sensitivity. When someone walks in front of the lens, the infrared rays emitted by the human body will alternate from the "blind area" to the "high sensitive area", so that the received infrared signal is input in the form of sudden strong and weak pulses, thereby strengthening its energy amplitude .
The central wavelength of infrared radiation radiated by the human body is 9~10--um, and the wavelength sensitivity of the detection element is almost stable in the range of 0.2~20--um. A window equipped with a filter lens is opened at the top of the sensor. The wavelength range of light that this filter can pass is 7~10--um, which is suitable for the detection of human infrared radiation, and other wavelengths of infrared rays are filtered. The sheet is absorbed, thus forming an infrared sensor specially used to detect human body radiation.
PassiveInfrared Ray,Pyroelectric sensor,Highly sensitive sensor
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