It has been nearly ten years since I tasted the haze of the Northern Kingdom. In the sea of people in the imperial city, I rented a broken house to live in. In the morning, I could see a thick yellow haze and hear the voice of the morning exerciser coughing. When you touch an acquaintance in the misty haze, you will use a slow and leisurely voice to sigh and answer each other: "Alas, the sky has become hazy again -" (This word is pronounced very high and dragged very long.) "Isn't it? PM2.5 has exploded!" When people in the north read the word "burst", they always like the word "bubble". With the word "table" at the back, the tone is flat and oblique. This mispronounced rhyme is just right. Of course, the fog in the South also has its unique features, such as the bright moon on the 24th Bridge in the hazy, the autumn tide on the Qiantang River, the residual lotus in Lizhi Bay... (excerpt from Haze in the Old Capital)

[Jinghua Dreams of Misty Rain in Jiangnan] The article is a bit of a joke, but it is a true portrayal of the life experience of the author and many Nanpiao people. I, a native of the old industrial base in the northeast, have long been used to the haze mixed with the smell of coal ash, mineral powder and firewood; The journey to study in the imperial capital is like a dream in Beijing. After a long time, I gradually become familiar with the historical depth and unique charm of Beijing haze, and also understand the people's desire for windy weather in the imperial city; After suffering from the haze in the north, I decided to choose Jiangnan Water Town when I graduated for a job, and imagined that the picturesque Jiangnan should have more fresh air in the misty rain.

[Later on, I woke up like a dream] However, after settling down, it was like waking up from a dream. Rainfall had no effect on PM2.5 content. The per capita car ownership in Jiangnan is higher, although the air in the scenic spot is fine, it can't afford to live, the buildings in the urban area are dense and lack of wind baptism, and the light industries such as textile and leather processing around the city are developed. The haze bred is different from the rough in the north, which is more warm, delicate, and lasting. The entrance is slightly sweet, soft and strong, and full of stamina. In addition, the annual air humidity in the region exceeds 60%, and bacteria breed in the haze. Like a girl in the south of the Yangtze River with an oil paper umbrella, she covers your eyes with green fingers and whispers in her ear: Do you like the haze of osmanthus or peach blossom?

[Shopping for Kongjing has experienced twists and turns] In order to improve the indoor air quality for the health of the whole family, the author has used many air cleaning products. The price of imported goods is high, but the replacement of parts is difficult, and after-sales service is not guaranteed. Finally, they rely on the corner to eat dust. After suffering from the loss of foreign goods, Mr. Lei was tempted by the low price of his products. He found that the room was a little larger and was tired of dealing with the need for additional filter elements to remove formaldehyde. After many detours, I tried to use quantity to make up for quality. However, it not only takes up room at home, but the noise of machine operation at night affects sleep. Fallen leaves are flying, and the fog season is coming again. At the moment when the author is at a loss, Lei Feng.com Love to play computer games The platform launched the 352 air purifier trial activity, and we are lucky to take this opportunity to express our heartfelt thanks!

[Five elements video experience] Therefore, the selection of air purifier should not be based on blind speculation of price alone. Based on experience, the author believes that the evaluation elements are ranked in order of importance: 1. CADR value of clean air output ratio and CCM value of cumulative purification capacity; 2. Noise generated in different modes; 3. Actual power consumption for continuous operation in a certain period; 4. Whether the design is humanized and simple enough; 5. The size of the occupied space and the degree of integration of the home environment. This issue will focus on these elements, starting with the details of 352 X50 air purifier, and comparing the composition of turbine, filter element, air duct and other core components with similar products. In combination with the video, we will focus on testing the purification capacity of X50 for PM2.5 particles, formaldehyde and other TVOC, noise decibels under different modes and long-term continuous operation power consumption, and summarize and analyze the advantages, disadvantages and cost performance of the product.

[Simple keys and practical functions] Simple and practical household appliances are preferred. X50 touch keys include: child lock, wind speed regulation, mode switching and power switch. All keys are integrated in the top panel area. The front display screen can display the PM2.5 value in real time, which is connected with the material of the touch keys through the black piano baking process. The top display screen is designed with a certain tilt angle, which is convenient for users to operate and view the wind speed, child lock, WiFi networking status, filter screen cleaning, filter element life, linkage status and operation mode. The deepest feeling of the author is that the waterproof effect of the operation area is good. There are inevitably some water drops on the cooking hands. The slightly inclined surface of the panel is more comfortable to use for waterproof.

[Less land occupation, top air outlet] The 352 X50 intelligent air purifier is made of ABS plastic, and the overall insulation of the shell is more comfortable to use at home. There is a brushed feel panel on the front. The 310x310x763 (mm) three-dimensional panel is smaller than the X80 series, and only needs 0.096 ㎡ of floor space. The horizontal area is small and the vertical height is just within reach, which conforms to the modern home design concept. The X50 chessboard shaped air outlet is designed to stir the whole air flow more evenly on the top than that on the front, so that the indoor purification effect is better. At the same time, the air outlet above is also more suitable for use in the study, bedroom and other environments. Even if the air volume reaches the highest gear of 500m3/h, it will not affect reading and writing or sleep and rest.

[Easy to replace filter element and disassemble] The replacement of the filter element is very simple. The back cover of the handle of the filter door is printed with illustrations (the paper manual and 352APP also have detailed descriptions). The design highlights will not be repeated here. First of all, pushing and pulling the filter element lock catch can fix or unlock the filter element, which is easier to replace the filter element than the pop-up snap catch, and can also ensure that the top of the filter element closely fits at the air inlet. Secondly, although the manual requires opening the door after powering off, the machine will automatically stop if children are curious about opening the lid. Finally, a protective net is set near the fan blade, and the turbine is far enough away from the air inlet and outlet. After talking about the replacement and fixing methods of accessories, let's look at the filter element. The diameter of the filter element is about 26.7 cm, and the height is about 41 cm. There is a handle at both ends of the filter element for easy removal and replacement. The surface layer of the filter element has a primary filter screen, and the middle layer is filled with activated carbon inside the filter paper.

[RFID bottom anti slip] The bottom of the filter element of the X50 air purifier is attached with a RFID (Radio Frequency Identification) tag. Every time the filter element is disassembled, replaced or cleaned, the machine will identify whether to install the filter element, scientifically calculate the filter element purification service life, and timely remind the user whether the current filter element needs to be replaced. The base of the X50 does not continue the design of the X80 series rollers, but uses four anti-skid rubber pads. The author believes that it is reasonable to increase the height of the pulley body. The gross weight of the X50 machine, including the filter element, is 13.5kg less than that of the X80 series. It is not difficult to move indoors. The addition of anti-skid pads enhances the stability of the entire equipment.

[High quality filter paper has strong airtightness] The top of the X50 filter element is designed with a soft rubber ring. At the same time, the bottom pop-up cartridge can effectively enhance the tightness of the filter element, ensuring that the air at the air outlet must be purified by the filter element. The outer layer of the filter element is designed with a screen like mesh, which can effectively prevent foreign matters such as hair and cotton wool from getting stuck in the gap of the filter element. It is very convenient to clean the outer surface of the filter element with a vacuum cleaner after long-term use. For particles invisible to the naked eye, the X50 filter element is filled with 4 square meters of H13 grade high-efficiency filter paper. The author has experienced that many air cleaners have been under this banner. However, the level of filter paper is not a fixed constant, and the actual effect should be tested in connection with the air outlet speed. As the wind increases, the filtering efficiency of inferior products will not meet the standard. Therefore, we might as well take this question into consideration and observe the air purity of X50 outlet under the extreme wind speed in the later measurement part.

[More materials and longer life] In fact, the principle of filter element type air cleaning is very simple. Filter paper layer is used to block particle dust and carbon to filter harmful gases (formaldehyde, toluene, TVOC, etc.) in the air through physical adsorption and chemical adsorption. The X50 is particular about the filter element materials. The air is filtered by the advanced filter paper layer and then filtered by 950g formula activated carbon here. There are many kinds of activated carbon, but the purification effect is very different. The specific data of the composition ratio of activated carbon is a trade secret of each manufacturer. However, referring to the composition of X80 activated carbon, the author estimates that X50 should also use a variety of formulated carbon and granular catalyst media, including enhanced activated carbon, high iodine value activated carbon, solid aldehyde activated carbon, formaldehyde decomposition catalyst and other components, Broadly filter more than 100 kinds of harmful gases in the air, and in view of the slow release of high concentration formaldehyde and other TVOC pollutants in the room after the decoration of new houses, the double effect formaldehyde removal material solves the problem of easy formaldehyde desorption and easy saturation of activated carbon, and its adsorption capacity is stronger than that of ordinary activated carbon.

The adsorption capacity of a single filter element has an upper limit, so consumers need to consider the service life of the X50 filter element. The cumulative purification amount CCM represents the amount of formaldehyde or particulate matter that can be eliminated by the product before the air purifier is "scrapped". The higher the value, the longer the service life of the filter screen of the air purifier. There are different parameters for different target filters, such as formaldehyde CCM and formaldehyde CADR. The official data of formaldehyde CADR is 150 ㎡/h, which has a life of about one year in most applicable environments. What are the parameters of formaldehyde CCM? Each filter element cannot be exactly the same. Generally, CCM is a range value with reference to the weight of activated carbon. The author estimates that it is about 2363mg, which is equivalent to that the whole family inhales less pure formaldehyde crystals with the weight of a coin in their lungs. I hope that the official will provide more accurate data to satisfy the curiosity of students who like to ask the truth.

[Horizontal comparison of core parameters] Before performance measurement, we might as well compare the core parameters with similar products horizontally: 1. In terms of air purification efficiency, the CADR of X50 particles is 500m3/H, and that of coarse grain 2 particles is 310m3/H; 2. From the perspective of filter paper grade, X50 uses H13 filter paper and coarse grain 2 uses H11 filter paper; 3. From the perspective of impurity purification type, X50 can filter harmful gases such as micro particles and formaldehyde. The CADR of formaldehyde is 150m3/H, and there is no accurate parameter for removing formaldehyde from coarse grain 2; 4. From the perspective of the service life of the filter element, the X50 single filter element can be used for about one year, and the service life of most filter elements on the market is only half a year; 5. Judging from the area of rooms used, X50 is suitable for rooms within 60 square meters, and coarse grain 2 is suitable for rooms 20~37 square meters.

[Different design concepts] These core parameters are the issues that users are most concerned about, and it is also difficult to add water. However, in terms of power consumption and noise decibels in different modes, we will not list them here for the time being. In the performance measurement part, we will use objective data to verify the real performance of the X50. Looking back, we can analyze the difference between the two product design concepts: first, the X50 can display PM2.5 data on the front of the machine and the mobile phone App in real time. Coarse grain 2 can only be displayed on the mobile phone, which is not convenient for real-time viewing of air quality; Secondly, from the air inlet design, the other three sides of the X50 are designed with grilled air inlets except the front, and the bottom of coarse grain 2 has four directions of air inlet; From the perspective of use environment and consumer groups, the X50 can be competent for larger rooms, and the addition of child locks and remote controls can better serve families with elderly and children.

[Obvious contrast between the two kinds of decoration] The decoration environment has a great impact on the air quality at home. The author used the National Day holiday to test the X50 in two houses decorated with solid wood and modern style. The living room with all solid wood furniture has about 40 square meters of double doors and windows with strong airtightness. After 10 minutes of operation of the purifier, PM2.5 is lower than 10, and TVOC content such as formaldehyde is also far below the standard line (it can be seen that the importance of decoration materials, and the elderly really like solid wood furniture). The living room with modern style decoration also has an area of about 40 square meters. The leather sofa is a rubber cushion for beautiful walls. Therefore, the indoor formaldehyde and TVOC content exceed the warning line. There are many doors and windows and it is difficult to purify indoor air in single layer haze days.

[A profound lesson has been learned] The decoration should not only focus on the beauty, but also assume that the price of paint, furniture and walls should be high and the quality should be good. The lesson is very profound, but it has been done. We can only rely on the air purifier. As shown in this group of photos: in the living room with solid wood furniture, the PM2.5 content of X50 is kept at about 6 μ g/m3 after 10 minutes of purification, and formaldehyde and TVOC are lower than the standard line; In the modern style living room, after X50 continued purification for 10 minutes, PM2.5 decreased from 47 μ g/m3 to about 10 μ g/m3, and formaldehyde and TVOC values also decreased significantly. However, formaldehyde content 0.157mg/m3 and TVOC content 0.922mg/m3 are still above the warning line.

The formaldehyde content of X50 drops below the warning line after 3 hours of uninterrupted work in the new home, but it is not cold in a day. It requires continuous efforts to completely solve the hidden dangers left by decoration. After repeated comparison of various methods, I have a trick to share with you. It is better to open the window for ventilation when the formaldehyde concentration is high at home, and use the air purifier after the volatile is stable. In fact, toxic gases such as formaldehyde continue to permeate and volatilize from furniture and decoration sites (formaldehyde emission peak period is 3-5 months, and volatilization lasts for more than 10 years), which requires long-term continuous purification.

[Pure wind and instant effect] As previously described, whether the air filtered by the purifier is pure is the standard to measure its core performance. The author chose to open the sliding glass doors of the kitchen and living room at lunch time. The lampblack made the indoor PM2.5 soar to 225 μ g/m3 in an instant, and the X50 quickly switched to the highest wind speed under the automatic mode and opened full power to purify the air. At this time, put the air quality detector near the air outlet, and the content of PM2.5 particles and harmful gases is basically zero. Keep purifying for about 15 minutes, and the indoor air completely meets the standard. The PM2.5 content in the living room is 32 μ g/m3. Before going to bed at night, close all doors and windows, and keep the PM2.5 level below 15 μ g/m3.

[Gentle and quiet wind] The greater the air outlet speed and air volume of the air purifier, the noise as a by-product of air purification is inevitable. The design of air duct and impeller of air purifier involves hydrodynamics, and the author pays more attention to the actual effect. Because family members cannot fall asleep again when they sleep very quietly with a slight noise, they looked at the 500CADR value before getting the product, and were worried about whether the noise of the extreme wind speed mode is lower than 60 decibels as advertised by the manufacturer. When testing the purification effect, collect multiple groups of data synchronously, and observe the noise decibels at different distances and gears. The average value of the five groups of data near the peak value is about 57 dB for the highest wind speed gear and 43.2 dB for the lowest gear (disturbed by the background sound at home). When sleeping in the bedroom, all lights go out automatically, and the wind near the exit moves evenly and softly, without feeling its existence at all.

[2 yuan per month to save electricity and money] The performance of the purifier is so strong that it must use a lot of electricity, right? Many people can't understand the power consumption and energy saving level marked in the factory. 1.6W power consumption in standby mode, 6.8W wind power in the first gear, and 35W in the fifth gear. Everyone must be full of questions about how much power is needed every day? How much does it cost per month? First, the upper limit of power consumption (35W * 24 hours | 1000) is calculated according to the highest gear in 24 hours. The upper limit of power consumption per day is 0.84 degrees. According to the peak and valley power prices, it only costs 33 cents. The actual power consumption is far lower than the upper limit value. The author has been using the X50 in automatic gear for 7 consecutive days. The average power of 6.4W is only 0.168 kilowatt hours per day and 5.04 kilowatt hours per month in order to round it up. According to Hangzhou Fenggu Power, it is even less than 2 yuan per month, and the electricity charge for continuous purification of air does not exceed 30 yuan per year, It seems that the imported DC brushless motor is really worth the price.

[Experience of software design] Open the 352 mobile phone app and the slogan "Let everyone breathe safe and clean air" appears. Recall that although there was no iPad in our childhood, there was blue sky and white clouds every day. Now living in the city and breathing pure air has become a luxury. The evaluation does not need to go into the manual, but directly comments on the advantages and disadvantages of this air purifier supporting software: the remote controller is at his fingertips, the interface is simple and easy to operate, and the core elements are prominent at a glance. Because this company focuses on the research and development of air purification products, it does not have too many fancy hardware connections (only linked with the M25 air quality monitor) with some brands, which is exactly what the author appreciates most. The purifier should do its own thing. The mobile phone software can tell the user directly about the current outdoor air quality, the indoor air quality and the working mode.

After talking about the advantages, let's talk about the further optimization of software design: 1. The child lock function is better to go to the main control interface in advance; 2. It is suggested to increase the warning line of air pollution. In case of serious air pollution at home, APP and SMS can simultaneously remind users to pay attention to the situation at home (even play the role of fireworks alarm); 3. Modify the calculation method of the remaining life of the filter element. After two weeks of trial, the author thinks that the consumption of the filter element needs to be further linked with the standby time of the operating gear; 4. Expand the horizontal interface to enrich the content of mobile phone APP, for example, enrich the professional evaluation of air purifier, tips and common sense of maintenance, purchase of filter element and 352 official website links, so that users feel that the software is more interesting than practical.

In addition to the above points, it is also hoped that the manufacturer will consider adding formaldehyde content detection sensors in subsequent models such as the X50C. Although adding highly sensitive sensors will increase production costs, this is exactly the practical needs of many users. There are several practical skills about the air purifier to share with you: first, regular cleaning and maintenance of the machine can extend the service life and measurement accuracy, use a vacuum cleaner to clean the outer layer of the filter element and take it to the sun to extend the life and kill bacteria, and use a cotton swab to clean the sensor every quarter to improve the PM2.5 measurement accuracy. Secondly, when the indoor formaldehyde TVOC content is too high, the most effective way is to open windows for ventilation. When the volatilization is stable, it is the stage of the purifier. Finally, the air purifier can filter out harmful gases and particles in the air but has no function of producing oxygen. If it is not a heavy haze room, it is better to leave a window.

[Safe, safe and considerate design] The X50 not only has excellent performance, but also always takes the first place in safety as a home appliance. The X50 is more considerate in the design of safe use: 1. If a child opens the back cover of the purifier during operation or standby, the device will automatically cut off the power supply, and when the back cover is replaced, the device will automatically restore power and enter the standby state; 2. The shell of the whole machine has no edges and corners, and the use of insulating materials does not need to worry about leakage; 3. The engine of the air purifier is far away from the air inlet and outlet, and the grid is too small for children's fingers to penetrate; 4. The weight of the machine body is evenly distributed, and the base is provided with anti-skid rubber pad, which has high stability. In terms of design details, the needs of different age groups in the family are taken into consideration: first, the addition of child locks allows families with babies not to worry about the children's curiosity affecting electrical work; The standard remote control allows young people to operate remotely without looking down at their mobile phones, especially for the elderly who do not understand smart phones, so that parents can easily use it to make babies safe.

[Experience summary and optimization suggestions] Thanks to the company's trial use and 352 Technology for providing this evaluation product. After two weeks of in-depth experience, the 352 X50 air purifier left a deep impression on the author: the X50 has a simple and elegant appearance, covers a small area and saves home space, and the core components are well selected and use enough materials; It can purify PM2.5 particles, formaldehyde and other toxic and harmful gases in the air quickly and thoroughly, and has strong performance. The purified air has large air output and pure air output; On the premise of maintaining high efficiency of air purification, it can automatically switch gears according to the environment, with low power consumption, low power consumption, low cost, low noise, and smooth air flow. The lighting effect can be turned off without affecting the work and rest of users. The design of this air purifier is full of humanistic ideas, fully considering the needs of different age groups in the family, and it is easy to operate. In this evaluation, the author also recognized the importance of decoration materials. Friends who have been suffering from smog in the city since their homes were decorated may start to experience this new product that cleans the air and protects the health of their families quietly.

In order to further optimize the product experience, the following suggestions are proposed for reference:

1. Add warning function to remind users of gas pollution exceeding the warning line automatically by switching mode App and SMS synchronously;

2. Optimize the air inlet design, consider the user's habit of placing household appliances against the wall, and reserve a hidden air inlet grid on the front panel;

3. We launched an extra long filter element, installed a formaldehyde dynamic monitor and launched an enhanced formaldehyde removal filter element for newly decorated families.

For free trial and professional review information, you can follow the Woaiqiku official account (woaiqiku)