The persistent haze came earlier than last year

As a northerner who lives in a polluted city, he welcomes the coming haze. The haze has appeared before the middle of September. Haze masks and purifiers are in hot season again. He wears masks outside and purifiers indoors. Now it is common to wear masks when going out. Compared with October and November of the previous two years, there is haze earlier.

How to purchase the purifier

There have been many popular science articles on the purchase of purifiers. A brief summary of the purchase concerns is made. The brand and price are only a reference, not the main reason for whether to buy or not. As for the publicity of merchants, don't trust them all.

1. CADR value, the abbreviation of Clean Air Delivery Rate, which means clean air output ratio in Chinese, is verified and calculated by the American Household Appliance Manufacturers Association according to standard procedures. Generally, the higher the CADR value, the higher the air purification efficiency. According to the CADR value, we can calculate the applicable area of an air purifier, that is, the maximum air output/(air changes per hour * building height). Another common calculation formula is (0.07~0.12) * CADR value. For this hourly air change rate, the international minimum standard is 5 times. When purchasing air purifier, select the appropriate air purifier based on the CADR value and the use area of the family space.

2. The type of filter element is related to the replacement cost in the later period. The actual purification effect of the air purifier is directly related to the filter grade and material type of the filter element. The common filter elements in the purifier are

Primary filter screen: used to filter hair and other large size suspended solids; Activated carbon filter screen: physically adsorb some toxic substances and some suspended particles; HEPA filter screen: physical filtration of PM2.5 suspended particles; Formaldehyde filter screen: special material, specially used to absorb formaldehyde and other harmful substances; Plasma dust collection net: mainly used to catch oil smoke and smoke in the air; Photocatalyst filter screen: use ultraviolet light as energy to generate active oxygen and oxyhydrogen free radicals and decompose toxic substances such as formaldehyde, methylamine and benzene; The humidification filter screen can not only wet the air, but also reduce dust and temperature. These filters may not appear in a certain purifier at the same time. After all, the volume is limited and the price is limited. Generally, the more filters, the more in-depth and effective the cleaning effect will be. As for the service life of the filter element, it is directly related to the environment used and the developed area. When the filter element is discolored, it should be replaced in real time to avoid affecting the filtering effect. Taking HEPA filter element as an example, the smaller the developed area and volume, the shorter the service life of the filter screen; The larger the development area, the larger the volume, the longer the use time, and the higher the purification rate.

3. Filter element grade. At present, the filter element grade used by air purifiers on the market is generally between H10-H14. This grade adopts the European standard. The higher the grade, the better the filtration efficiency. Therefore, H14 is the highest. The common filter element grades are H13 and H14. The filtration efficiency of H13 can reach 99.95%, and that of H14 can reach 99.995%. But at the same time, we should know that the higher the efficiency of the filter element, the greater the air resistance will be, and then the efficiency of CADR will decline. Therefore, pay attention to the filter element grade and CARD value at the same time. It is meaningless to only have a high CARD value.

3. Noise refers to the scene used at home. Generally, the bedroom needs a relatively quiet environment, especially at night. Therefore, when purchasing the purifier, it is necessary to query or information the noise value during operation, so as not to affect the rest.

After understanding the basic purchasing knowledge, let's take a look at this 352 X50 air purifier. Its working principle uses the common HEPA technology. The innovation in functional design is to add the function of connecting to WiFi and support the APP remote control function, which belongs to the intelligent category. At the same time, it has its own display and touchpad, which is convenient for viewing and management operations.

Products

1. It has been certified by the testing agency and can be checked in the official store

2. It has its own performance test certificate, which can be measured and compared by itself

3. Compact body, low price, installation free, plug and play, cover opening and automatic power off, safer use

4. It supports APP remote control management function, which is faster and more convenient

5. It has its own touch panel and display screen, which supports remote control operation and child lock function to prevent children from tampering

6. Three modes and five wind speeds are adjustable, CARD value is high, and filter element grade is H13

7. The air detection is sensitive and accurate, with three air status indicator designs, and the filter element is easy to replace

8. Three air inlets and one air outlet design, excellent filtration performance,

9. The air status indicator lamp is located in the interior and is hard to see

10. Although there is a layer of primary filter screen outside the filter element, the three air inlets are not equipped with primary filter screens to directly filter some large hair pollutants

Eye catching, a simple and clear performance test certificate

Generally speaking, any air purifier has been tested and certified by relevant institutions, and will be posted on the official website or official store, which can be used as a basis for purchase or inquiry. After unpacking, the first thing that comes into view is a certificate marked with the performance inspection of the purifier. You can directly query the air volume values of different gears, and you can intuitively understand the performance of the purifier. From the figure below, you can also see that the CARD value of the X50 at the maximum gear can reach 514m ³/h. However, this picture is also a reference. Some players with professional instruments or friends will directly test the air volume. If the third-party test data is too different from the marked data or there is something fishy, there is still a great risk.

The X50 air purifier can remove VOC, pollen, particulate matter and formaldehyde in terms of function. The other two key parameters refer to official data. The CADR value of formaldehyde removal is 150 m3/h, and the CCM value of formaldehyde is F4 (>1500mg); Except that the CADR value of particulate matter is 500 m3/h, the CCM value of particulate matter is P4 (12000 ≤ M).

Note: CCM value is an important parameter index in the national standard of new air purifier. CCM is the abbreviation of cumulative purification capacity of the purifier. It describes the total weight of pollutants that can be accumulated by the purifier when the filtration capacity of HEPA or formaldehyde filter screen decreases to 50%, in milligrams. CCM's new national standard data is divided into two categories: CCM particulate matter and CCM formaldehyde, There are four grades of CCM particulates, P1 to P4. In terms of CCM formaldehyde, F1 to F4. The higher the number, the better.

The body is relatively small, and the design of indicator light is modified, with its own display screen and touchpad

Compared with the X80 and X83 of the 352, the X50 has less roller design in design. At the same time, the large air quality status indicator has also been canceled. It is also smaller in size, only 763mm * 310mm * 310mm, which takes up less space. The X50 is designed with a DC brushless motor, the maximum power can reach 35W, the noise is controlled at 59dB, and the HEPA filter screen grade is H13.

In the air outlet design, the X50 adopts a flat upper air outlet design and a chessboard lattice panel design, with an effective area of about 25.5 cm * 25.5 cm. The design of the top cover above the X80 and X83 air outlets is canceled, and the way of scattered air outlet is changed to a straight up way. The direction of the air outlet is fixed and cannot be adjusted, but it also ensures the effect of rapidly stirring the indoor air.

For this panel, first of all, the design of the child lock function is not the child lock function, but there is no child lock switch button function on the remote control. It was originally thought that the child lock can only be opened or closed through the mobile phone APP, but later found that the child lock can still be opened or closed by pressing for three seconds. Personally, compared with the design of directly pressing and holding the touchpad to open or close the child lock, only using APP to open or close the child lock is the correct design mode, because today's 3 - and 4-year-old children are good at playing digital products. The child lock button here only indicates the enabling or closing status by turning on and off the backlight, while the opening key requires a long press of 2 seconds to function normally, effectively preventing the operation of accidental touch. However, the buttons corresponding to the light, wind speed regulation and mode are touch and response, which is very sensitive. There are three preset modes, namely, sleep, extreme speed and automatic. The wind speed is adjustable in five gears. As for the lighting design, it is slightly complicated.

The X50 has a power status indicator, which is green during operation and orange during standby. It was mentioned earlier that X50 cancels the intuitive large air status indicator on X80 and X83, but there is still a hidden air status indicator, just behind the touch panel. When the pollutant value exceeds the preset value, it will turn red, then orange, and then green after cleaning, while the front indicator will not change at all, This means that the front status indicator and the air status indicator are independent of each other. However, the design of the position of the air status indicator light is not intuitive, and it should be integrated with the front status indicator light.

The top and front display screens are connected by black piano paint process materials, which are different in display content. It can also be seen from the above picture that the top display screen is not a horizontal design, but is inclined at a certain angle for easy viewing. You can view the wind speed, child lock, WiFi networking status and operation mode. The display screen on the front of the fuselage only displays the PM2.5 value in real time

In the air inlet design, except for the front, the other three sides of the air inlet are designed with grille design to ensure the air volume entering, but the design of the primary filter screen is not added to screen dust, fuzz and other pollutants. You can choose a type of electrostatic adsorption filter paper to install, so as to improve the service life of the filter element. The figure on the left shows the design of the back. The replacement and installation of air detection elements and filter elements are on this side. The design for safe use is considerate. When the purifier opens the back cover during operation or standby, the equipment will automatically cut off the power supply. When the back cover is installed, the power will automatically recover and enter the standby state.

For the core detection element, the X50 adopts the design of semiconductor laser detector and micro sampling fan, which can detect particles with a minimum diameter of 0.1 μ m, thus ensuring the accuracy and reliability of PM2.5 measurement data. At the same time, the sensor adopts a detachable design, which facilitates the upgrade and replacement in the future. As for sensitivity, it will be verified later by comparing with Haier Air Fruit.

For the fan part, the Japanese Zhipu DC brushless motor is used, which can significantly reduce the noise and power consumption when the fan rotates. With unequal distance wind wheel design, the rotating speed can reach 1400 rpm, thus providing stable air replacement efficiency.

The filter element adopts a cylindrical design, which also explains why the X50 adopts a three side air inlet design. This filter element uses 4 square meters of H13 grade filter paper and 950 grams of activated carbon, which is far more than some purifiers in terms of materials. If it is used indoors normally, it will not be a problem in the past year.

However, after further removal, it was found that the filter element was wrapped with a layer of white primary filter screen with small holes, which could play a certain filtering role. It is strong in material and can be cleaned with a vacuum cleaner and a brush, but it is not easy to disassemble and can not be washed.

This is the black activated carbon part of the inner wall, which is fixed by a circle of steel wire mesh. The filter element is divided into two parts: white HEPA and black activated carbon, which are fixed together and inconvenient to disassemble. However, there is another point. It is the specific type of activated carbon used, such as whether it is coconut shell activated carbon or composite activated carbon. There will be differences in filtration effect, which will also affect the price.

The replacement of the filter element is very simple. Just pull the central switch to fix or remove the filter element. There is a clear click sound.

The diameter of the filter element is about 26.7 cm and the height is about 41 cm. Can this filter element be used with other filter elements of the same specification? Theoretically, it is OK. After all, as long as it can be installed, it will have a good filtering effect. However, the original filter element has an RFID mark at the bottom, which is used to identify the filter element by the body. It should involve relevant information about the service life of the filter and cleaning tips of the primary filter screen. However, the price of the filter element has not been inquired at present.

Let's go to the actual experience review.

Air quality change detection is extremely sensitive

For the evaluation of detection sensitivity, under the indoor window, smoke, gel and ozone are simultaneously simulated for verification, and the detection effect is verified by comparing the numerical changes of Haier Air Fruit.

However, before starting, first compare the detection differences between the two devices. After all, you should have a good idea. For Haier air box, first, it has the function of monitoring air quality. PM2.5, VOC, etc. can also monitor temperature and humidity; Second, it can realize linkage with other equipment, such as air conditioners and purifiers. In order to simulate the peer-to-peer environment as much as possible, the detection elements of the two devices are basically placed at the same height.

In the case of stabilization, the two devices have errors in the measurement of PM2.5, and the X50 number changes most rapidly each time. Each time, the value of X50 is lower than the Haier air box, which may be related to the active detection and laser measurement methods used by the X50.

In terms of comparative measurement, four scenarios are selected here. One is to open a window near the window for ventilation; One is to simulate ozone; One is to simulate smoke; One is to simulate the spray with pungent smell (jelly, perfume, toilet water, etc.), and record the time when the values of the two devices changed and the value of the first change. In order to reduce the impact of X50 cleaning effect, the running mode is changed to night mode.

As can be seen from the comparison chart below, the X50 is better than Haier air box in detecting air changes. For this ozone simulation experiment, DGQ purification equipment is used here. It can also be seen from the figure below that the two equipment are not particularly sensitive to the change of ozone concentration. In about five seconds, I have smelled the smell of ozone around, but neither of the two equipment has changed, Ozone with sterilization and deodorization function may not be regarded as a pollution source.

Excellent filtering performance, low noise, low power consumption

For filtering performance, we select three places for verification: bedroom, study and living room with relatively few furniture. The room is about 3m high. Close all doors and windows, and leave the site during verification. X50 is placed in the center of the room, with the maximum air volume, and the air box is placed in the corner of the ground. In order to prevent the error from increasing, stop the timing when the PM2.5 value of Haier air box appears at 20. The following data is carried out first after the product is obtained to ensure the relative accuracy of the data to the maximum extent.

The second berth is 16 square meters, with one bed and one table.

The study covers an area of 12 square meters, including a desk, a computer desk, three chairs and a single cushion sofa.

The living room is 32 square meters, with few furnishings, a sofa, a solid wood table, and no decorative cabinet design.

Next, we will simulate the cleaning effect under the smog environment and calculate the running time. The first is in the living room, after all, the space is the largest, followed by the study, and finally the second bedroom. Due to the difference between the home environment and the theoretical testing environment, as well as the difference in testing methods, the results are valid for the current test verification, and the data is only for reference. It can also be seen from the following data that the data under the 12 square meter study (468 m ³/H) is the closest to the official data of 514 m ³/H in the three environments. The cleaning performance is better than that of the air purifier in use.

In terms of noise performance, the mobile phone APP is used for measurement, which is only for reference. The noise at 5cm above the air outlet is 66dB after stable monitoring, and 80dB when placed directly at the air outlet. However, if measured according to the standard, the noise at one meter above is 58dB.

In terms of real-time power, it is only 4.3W in night mode and 34.7W in extreme speed mode, so the power consumption is not high.

The remotely controlled air purifier has no alarm push function

As a networkable air purifier, APP is naturally indispensable. The APP function can realize remote control, and has the basic function on the touch surface. At the same time, it can also query the status of the filter element, report for repair online or purchase the filter element. However, WiFi still only supports 2.4GHz, which is excellent in remote control performance. The command can be executed normally under the remote control of 4G network and external network.

In addition, there are several points worth mentioning. First, we have not seen the OTA upgrade part, nor the relevant options that can be linked, such as binding Tmall Genie and Xiaofang intelligent remote control; Second, you can invite your family to share the current equipment, so that they can also control it remotely; Third, it has the air quality automatic statistics function, which can be used to query the real-time air quality status, and can also be viewed by hour and day, which is very convenient to understand the changes of air quality. However, an important function is that the message push function is not added. For example, when the air quality exceeds the standard, it will be automatically pushed to the APP to facilitate the user's corresponding operations.

Solid and effective air purifier

For the X50 of 352, let's talk about the suggestions,

First, I hope to add a detailed description of the composition of activated carbon, which will attract users' attention;

Second, the child lock can only be opened or closed through APP;

Third, add a layer of primary filter screen to the fence of the air inlet to filter out some hairs, large particles of dust and other foreign matters;

Fourth, the air status indicator light is designed at a more obvious position outside, rather than hidden inside secretly;

Fifthly, air quality alarm push function is added to APP;

Through the actual use experience, I feel that the X50 has two good things to do. First, when the CADR reaches 500, the noise is relatively well controlled, and the balance effect is relatively good; The second is the automatic power-off function of cover opening, which effectively improves the use safety. For the APP remote control function, it is more practical for smart hardware players like themselves, which can be controlled simply and conveniently, eliminating the trouble of remote control with universal remote control. The materials and workmanship are more solid, the appearance design is more stable, and the small volume is more suitable for random placement.