1. Foreword
Hello, everyone, I am abrams2415. Today I will mainly talk about the air purification equipment that almost all families have. Facing the dazzling array of air purifiers on the market, how should I buy? What key parameters can affect the performance of air purifiers? This article is to talk about the purchase of air purifiers in detail through four different types of air purifiers at home.
▲The air purifiers currently owned at home are: millet air purifier 2 generation, Japanese version of Daikin ACK-70N, airx A7, and Shulers KJ760F-A02
air purifiers can be divided into two Species:
1, pure physical passive filtration method:
through the HEPA filter to intercept PM2.5 in the air, to achieve the effect of air purification. Activated carbon filter is often attached to the filter screen to absorb TVOC organic gaseous substances such as formaldehyde and benzene in the air. However, the disadvantage of activated carbon is that it is easy to precipitate again after adsorption saturation. After being damp, the air purifier will easily produce sour taste.
2, pure physical passive + active purification:
is the common streamer energy technology of Daikin, which generates ozone through high-voltage ionized air to kill bacteria and viruses. Panasonic's nanoe nano water ion technology can inhibit the growth of mold and eliminate odors in the room, and negatively charged ions can wrap suspended dust and make it settle. These methods can effectively increase the life of the filter.
Among them, Xiaomi air purifier 2 and airx A7 belong to passive filtration, while Daikin ACK70N and Shulushi KJ760F belong to active + passive air purifiers. What is the performance difference between them?
2. Air purifier performance and parameter comparison
▲The owner's home did not consider the central fresh air system for renovation, so he could only install a wall-mounted fresh air blower later. The fresh air blower continuously inputs filtered fresh air into the room for 24 hours. Therefore, the air in the home keeps the PM2.5 concentration below 5 all the year round, and the carbon dioxide concentration is about 500PPM.
▲After installing the wall-mounted fresh air, the biggest feeling is that the house has less floating dust. Extend the period of the cleaning interval. However, the new fan in the host’s house also has disadvantages, that is, the particulate matter CADR value is not high, (fresh air volume 220m³/h), the air flow in each room is not enough, and it cannot achieve real whole-house ventilation. Only air purifiers can be used to create air flow to assist in filtering. That's why the host will put four air purifiers in the home (actually Daikin ACK70 has been abandoned, the reasons will be discussed below)
2.1 Xiaomi air purifier 2
▲ Xiaomi Air Purifier 2 is currently in the master bedroom. To be honest, the landlord wanted to throw this product away 2 years ago. The reason was immediately:
▲The CADR limit of Xiaomi air purifier is 330m³/h, and the applicable area is 39m³. But because its air duct is relatively simple, the noise is really loud, and the medium air volume is very noisy. The reason for not throwing it away is that the Mipi MATE accessories can be added to the Mi Air Purifier 2 with cylindrical activated carbon and superimposed cold storage fans, which has a certain degree of playability.
▲The second place where you need to complain: infrared dust sensor. It is set up entirely to save costs, and the experience is very bad. Because infrared dust sensors are not as accurate as laser particle sensors. It shows that when the PM2.5 of cooking at home explodes, it gives you a slow movement. When the air quality at home is very good, the maximum amount of air will occasionally be drawn
▲The performance of the Xiaomi air purifier filter is average. When the automatic mode is turned on, the PM2.5 concentration is best maintained at around 50. The filtering effect is generally
2.2 Daikin ACK70N
▲The Japanese version of Daikin ACK70N was bought back from the Amazon in Japan in 14 years. The main fancy at the time was its streamer technology
▲ The biggest problem with Haitao Japan Electric is that the voltage is different, so you have to drag a huge 110V to 220V transformer. Inconvenient to use
▲The host is equipped with streamer energy emitting devices on the left and right sides and in the middle. The principle is actually to use high-voltage discharge to ionize the air to generate static electricity to absorb dust and make it fall on the metal plates on both sides, which greatly extends the service life of the filter. The ionized air also produces ozone, which can kill viruses and bacteria. However, the sealed space is likely to cause excessive ozone and affect your health.
▲ The HEPA filter and activated carbon filter of Daikin ACK70N are designed separately, the CADR value of particulate matter and formaldehyde is unknown, and the visual parameters will not be too high. It uses infrared dust sensor like Xiaomi Air Purifier 2, so it reacts very slowly to the concentration of PM2.5 outside. , however, because of the activated carbon filter, it is prone to sourness over time. has not been thrown away because it has a steam turbine humidification function. It is good to be used as a humidifier in winter (helpless)
2.3 airx A7
z In February, when it first came out, the performance parameters were amazing, and the poster started decisively. It has been three and a half years now, and until now, its performance can surpass 70% of the air purifiers on the market.
▲ particulate matter CADR 700m³/h, according to the new national standard calculation method: minimum usable area 0.07×700=49 square meters maximum area 0.12×700=84 square meters
formaldehyde CADR 200 m³/h, according to the new national standard calculation method: minimum usable area 0.07×200=14 square meters maximum area 0.12×200=24 square meters
particulate matter CCM P4 level
formaldehyde CCM F4 level
▲This air purifier has high particulate matter CADR, particulate matter and formaldehyde CCM. The reason is that it has two left and right composite filters. Compared with the tower-type filter arrangement type air purifier, this arrangement greatly increases the amount of air flowing through the filter per unit time. The fold depth of the HEPA H13 filter is 3.9cm, which greatly increases the dust holding capacity
▲The reverse side of the HEPA filter is honeycomb granular activated carbon, which is used to adsorb TVOC organic volatiles in the air. Some of the activated carbon in the picture has turned white, which is caused by moisture. In the summer of high temperature and high humidity, bacteria are easy to accumulate and multiply on the carbon particles, which is the main reason why the air purifier emits sour smell over time.
▲There is a layer of washable coarse filter on both sides to filter out the air. Large foreign objects such as hair and catkins. Increase the service life of the main filter
▲The dust sensor can be removed by removing the fixing screw from the side of the fuselage. This airx A7 uses the Panten G7M laser dust sensor. Compared with infrared, the reaction is more sensitive and the measurement accuracy is higher.
▲This airx A7 has a mobile phone APP, which can far exceed the operation of the home purifier
▲In the middle of the front is a circular OLED display that shows the current PM2.5 concentration And wind speed. The outer halo is the air quality indicator ring, and other information is nothing like
▲There is an ambient light sensor at the top next to the minus button. When the light is turned off, the OLED screen will be automatically turned off to avoid light pollution
2.4 Shureus SoleusAir
A Shulushi KJ760F air purifier I bought some time ago is a whole house air purifier purchased after the owner has done a lot of homework. It can be seen as an enhanced version of Daikin ACK70 active + passive filtering and airx A7 passive filtering.6z. It solves the current pain points of air purifiers:
1, cannot directly decompose formaldehyde and TVOC, but can only be passively adsorbed, and activated carbon is easy to adsorb and be saturated and released again.
2, the activated carbon filter is easy to turn acid and produce peculiar smell.
3, ozone kills bacteria and viruses at the same time, the ozone concentration is easy to cause harm to the body excessively.
▲Schuler is a brand from the United States, and related products are sold on Meiya. The biggest reason for buying it is that it, like the airx A7, is equipped with a HEPA filter on the left and right sides of the fuselage. Therefore, it has ultra-high filtration efficiency and dust holding capacity
▲There is a large display on the top of the air purifier, which displays the life of the filter, the level of VOC organic volatiles, temperature and humidity, PM2.5 concentration and UV deep ultraviolet sterilization work Indicator light
▲The touch operation area on the top
▲The air volume has 6 gears + automatic gear, and the touch response is quick.
▲The rounded edge design, the children at home will not be injured by
z72.5zz2. High-end air purifiers are standard. The Schuler’s laser sensor is located at the rear of the fuselage. , It is very convenient to replace and clean the filter
▲ Same as airx A7, there is a layer of washable filter. Used to filter out medium and large foreign matter
▲airx A7 has a large area on one side of the filter. But compared with SoleusAir's filter, it is inferior a lot
▲ SoleusAir's HEPA filter grade is H12, and the fold depth is 4.5cm (airx A7 is 3.9cm). And there are two filters on the left and right! Created its very powerful filtering performance:
particulate matter CADR 800m³/h maximum use area 0.12×800=96 square meters! It can be said that one unit can be responsible for the air purification of the whole house
formaldehyde CADR 500m³/h, the maximum usable area is 0.12×500=60 square meters
In addition, the two filters on the left and right sides of this air purifier have accumulated purification amount of formaldehyde and particulate matter. Much greater than the national standard
formaldehyde CCM: F4 cumulative purification volume> 1500mg
particulate matter CCM: P4 cumulative purification volume> 12000mg
can be said to be the top model of the pyramid in the air purifier! But, do you think it's all over with this?
▲ This Shulers air-cleaning left and right filter does not have the activated carbon layer of airx A7. Instead, it is replaced by a layer of purple gold catalytic material (similar to the chemical catalyst layer on the back of the Daikin ACK70N filter), this layer of purple gold catalytic material (biological enzyme) Direct chemical reaction with formaldehyde and other VOC substances (formaldehyde + purple gold catalyst => carbon dioxide + water), directly decomposes formaldehyde. Therefore, there will be no adsorption, saturation and precipitation like activated carbon.
▲ There are 8 deep ultraviolet LED sterilization lamps arranged at the bottom of the left and right sides of the air purifier. The original poster bought a disinfection cabinet some time ago and just studied the LED ultraviolet lamp, which has a good killing effect on the bacteria and viruses on the filter. But is it over here? Not yet
▲At the air outlet, there are gaseous plasma clusters that can release tens of millions of levels per minute. These plasmas are released with the air outlet of the air purifier, and the generated positive and negative ions are generated at the moment when the positive and negative charges are neutralized in the air Huge energy release, causing the bacteria to die,Realize its sterilization effect
▲ Both purifiers are equipped with rubber rollers at the bottom, which is convenient to move in the house without hurting the floor
3. Performance test
▲ First look at the size of the HEPA filter of the air purifier. The amount of dust is definitely the first
3.1 laser VS infrared dust sensor
▲ The Daikin ACK70N on the left is an infrared sensor, while airx and Schuler are equipped with laser particle sensors. The detection sensitivity of the smoke cake on the host point:
Left 1: The infrared sensor detects the change in air quality after lighting the smoke cake, and the air status indicator turns red. But the magic is that it turns green after a while. The result is that when the air purifier is turned on the automatic operation mode, this purifier can not purify the air very well, because the air volume of the purifier can never be increased.
middle and right side: Both Schulz in the middle and airx on the right are equipped with laser particle sensors. When the smoke cake is ignited, they immediately detect the change in air quality and visually reflect it on the screen, and immediately adjust the automatic operation For the air volume in the state, the fan runs at full speed.
▲The host took out his own laser PM2.5 sensor. The indoor PM2.5 concentration detected by Schuler is 7ug/m³, while the laser sensor made by himself is actually 8. The accuracy of Schuler's is still good
▲airx A7's laser sensor has a good actual accuracy, PM2.5 2ug/m³, handheld display 4ug/m³
3.2 maximum wind speed
▲airx A7 particulate matter/hCADR 700m³ The particulate matter CADR 800m³/h. The difference is 100m³/h. This is reflected in the difference of 2 m/s in the maximum wind speed. The maximum purifying area of Shuler's air purifier is 96 square meters
3.3 Noise
▲The noise level of the BLDC motor of the Shulers air purifier in 6 modes, the maximum noise is only 56.7dB
▲airx A7 at the maximum gear The noise is 3dB higher than that of Schloss Air.
3.4 Air purifier purification efficiency
The laser PM2.5 sensor made by the host can automatically upload the current PM2.5 concentration to the server every 1 minute, so the test results are very reference under. Taking into account that the infrared dust sensor installed by Daikin and Xiaomi does not have the purification efficiency in automatic operation mode. So here are mainly airx A7 and Schulz. The test environment of
is as follows:
The living room in the home has a height of 2.4 and an area of about 30 square meters. Turn off the fresh air system and use smoke cakes to instantly increase the PM2.5 concentration in the house. Two air purifiers are turned on in automatic mode, and the purification effect is tested successively.
▲airx A7 has been used for several years. In this experiment, the two filters were replaced with new ones to eliminate the interference of use time on the performance of the filter
▲This is the original data of the purifier's purification effect sent back to the server status. There is no water, and now we are data processing:
▲Comparison of the purification efficiency of the two air-net purification after the original data processing (starting from the highest point of pm2.5 concentration). The starting pm2.5 concentration of red line Schuler's is as high as 350, and it only takes 25 minutes to reduce the indoor pm2.5 concentration to below 5. The airx A7 starts with a PM2.5 concentration of 180, and it takes 40 minutes to reduce the indoor PM2.5 concentration to below 5
▲Two H12 grade HEPA filters easily reduce the PM2.5 concentration at the air outlet to 0
3.5 Formaldehyde purification
▲Many air purifiers installed formaldehyde and VOC volatile matter detectors use cheap but easily interfered electrochemical formaldehyde sensors, which will falsely report perfume and other odors. The actual measurement of this Shulushi air cleaner did not interfere with the operation of the machine due to perfume.
▲ Shulushi's purple gold catalytic material (biological enzyme) directly reacts with formaldehyde to produce water and carbon dioxide. Therefore, there is no need to worry about the secondary release of formaldehyde. The measured formaldehyde concentration at the outlet is 0.01mg, reaching an excellent level
4. Summary
How to choose an air purifier that suits you and can clean the whole house? The first choice is to look at the CADR value of particulate matter and formaldehyde. A too low CADR value affects the purification efficiency. Secondly, look at the accumulation of particulate matter and formaldehyde CCM. Too low CCM will affect the life of the filter. Frequent replacement of the filter will increase the cost of later use.
At present, many consumers buy air purifiers to eliminate VOC organic substances such as formaldehyde in the home. They do not know that the activated carbon filter will precipitate twice, and the activated carbon is very easy to breed bacteria during the summer rainy season with high temperature and humidity, which will cause the air purifier to produce a sour taste. , This kind of experience is very bad. Therefore, the traditional physical adsorption method is not reliable.
Shuro's in the four air purifiers actively decomposes formaldehyde. Specifically, a layer of purple gold catalyst material behind the HEPA filter directly reacts with VOC substances such as formaldehyde to directly decompose formaldehyde. The cumulative purification amount of formaldehyde> 1500mg, which is far higher than the highest national standard.
At the same time, 8 UV deep-ultraviolet LED lamp beads are responsible for irradiating viruses and bacteria adsorbed on the HEPA filter, destroying the molecular structure of DNA or RNA in microbial cells, and achieving the effect of sterilization. To kill bacteria and viruses in the air outside the air purifier, gas-phase plasma is used. The positive and negative ions combine and release energy to break the virus. Its purification methods and functions are far superior to other air purifier products.
