20 17 Swiss weather

The newly-installed house has been installed for half a year, and it has been half a year since it moved in. Because I have a two-year-old daughter at home, I am always worried about the poor air quality at home. PM2.5 and formaldehyde are the hurdles that every parent can't avoid.

In order to solve this headache, we started from ignorance, from air purifier to fresh air system to wall-mounted new fan. First, two air purifiers were installed in two bedrooms, and now a new wall-mounted fan is installed in the living room.

Because the wall-mounted fresh air needs to make holes in the wall (I don't like the holes in the windows, which are ugly) and the use intensity is very strong (it may not be turned off for 24 hours), so the reliability of the machine is very high. More importantly, because of the constant consumption of consumables, where can I buy consumables if I buy a new fan? ! Isn't the machine just a decoration? It's scary to think about it.

1. So when deciding to buy, the first choice is: brand.

At first, we started with traditional central fresh air brands, such as Panasonic, Manfred, Honeywell and Yuanda. As a result, Panasonic and Manfred only had small air volume, which Honeywell did not find. Yuanda is too ugly

Later, I heard about the big potatoes that are very popular on the Internet. The stacking is quite serious and the price is not expensive, but it feels like a commercial machine. Rough workmanship, low face value, no pre-coarse filtration. Besides, is this name serious?

Plus, I'm afraid the company will die (not a curse, but I'm alarmist), so I haven't started yet.

Later, I saw Xiaomi's new Mijia fans, which made my eyes shine. It is 1.999 yuan (crowdfunding price) /2499 yuan (selling price), and it is also installed. This is indeed the price of cabbage. Originally, I was not worried about Xiaomi's bankruptcy, but the machine was unknown. The monitoring module of carbon dioxide and PM2.5 was integrated on the fuselage, which was better than nothing (this tank looked pale and powerless in front of the price)

Big potatoes or fresh air from Mijia may be a substitute for the second new fan installed in my home, but not now.

However, I got a message from the new fans of Mijia: It was made by the dreamer. Driven by curiosity, I went to check the brand. I thought it was also an emerging internet brand, but it turned out not to be.

Dreamer.

Xingyue Electric Appliance Co., Ltd. is a national high-tech enterprise. 20 14, xingyue electric appliance and KOJA Geb? Udetechnik GmbH (later renamed Dream Maker GmbH) established cooperation to develop and produce "ultra-clean fresh air" suitable for China air environment for China. At present, the central fresh air system is imported from Germany, and the new wall-mounted fan is made in China and Germany. 20 14 12, the dreamer released the first wall-mounted clean fresh air in Beijing, which solved the pain point that fresh air could not be installed in the renovated room; It is loved by a large number of users.

Dream Maker GmbH is an established enterprise specializing in producing R&D and fresh air in Germany. 1984 Irving Graumann founded GLT；; ; Quickly become the benchmark of the German fresh air industry; Company 1990 participated in the formulation of Trinkwasernor din1988 dvgw standard; 1999 became an enterprise of the german building and HVAC standards Committee; In 2006, he participated in the formulation of domestic fresh air standard DIN 1946 T6, Eco design, and Evia held the first energy-saving scientific seminar in Europe in 2007, which is still the benchmark summit of fresh air industry. Dreamers try their best to bring German manufacturing to the extreme.

20 17 Dreamer Technology signed a strategic agreement with Xiaomi to become an eco-chain enterprise of Xiaomi. Subsequently, 20 17 XF 120 was sold in the form of crowdfunding on Mijia products, and its new Mijia fan 20181was also launched in Xiaomi Mall.

-Excerpted from the Internet

To put it simply, a German company (GLT) has a joint venture with a domestic manufacturer (Xingyue Electric Appliance) to produce a Dreamer brand new fan. Just like Volkswagen, FAW and SAIC jointly produce and sell cars. The result of the survey is that this is still a brand with history and technology (no wonder Xiaomi chose it to cooperate), at least I can be less worried about when it will go bankrupt.

2. The brand has passed, which is actually another point I care about. After all, Yan value is hanging on the wall, and it can't be stopped.

20 18 german red dot product design award.

3. Next, an important factor (but not the only factor) in selecting the model is the air volume.

Calculation standard ①

According to European standards and China's national standard GB/T 18883-2002 "Indoor Air Quality Standard", the basic fresh air volume for adults is specified to be ≥30m. /h .

According to this standard:

Since there are only three people in the family, the wife and daughter, and the daughter is an adult, the basic fresh air volume should be ≥90m? /h

Calculation standard ②

GB 50736-20 12 Code for Design of Heating, Ventilation and Air Conditioning of Civil Buildings stipulates that:

Net residential area 180m2 (duplex two floors), per capita living area > 50m2, air exchange times per hour should be ≥0.45 times, and the storey height is calculated as 2.7m

Minimum fresh air volume = 0.45×180m2× 2.7m = 218.7m?

Note: The above factors such as air tightness, air consumed by combustion, exhaust air volume and the volume occupied by furniture are not considered.

Calculation standard ③

In order to maintain the positive pressure of the room, the fresh air volume is equal to the air volume that seeps from cracks such as door cracks and window cracks under a certain pressure difference between indoor and outdoor, which can be calculated by the following formula:

V=μAc(△p)n

Where: V refers to the air volume oozing from the room gap, that is, the positive pressure fresh air volume, m/s;

AC- clearance area, ㎡;

Δ p-positive pressure in the room, pressure difference between two sides of the gap, generally 5 ~10pa;

μ-flow coefficient, 0.39 ~ 0.64;

N- flow index, 0.5~ 1, generally 0.65.

In an all-air system, the maximum fresh air volume calculated according to the above requirements is usually taken as the minimum fresh air volume of the system.

Sorry, it's too complicated to count, so I'll list it for everyone to see.

After the above calculation, that is to say, theoretically, the air volume should be ≥2 18.7m? That's enough. Generally, the air volume of household machines on the market meets this requirement of 220m? /h、300m？ /h .

Considering the air tightness and other factors, it is necessary to reserve some air volume. I think fresh air follows the principle of "buy big but not small" like air conditioning.

But the more air, the better:

① The greater the fresh air volume, the more hot and humid outdoor air enters the room in summer, and the indoor walls in the south are full of water and moldy, while the indoor air conditioners are constantly losing, so it is necessary to pay more air conditioning electricity bills; In winter in the north, cold air will make the air drier and increase heating energy consumption.

② It is easy to reduce the indoor carbon dioxide concentration from 1000ppm to 600 ppm, but the change of oxygen content will not obviously increase the indoor oxygen content, but will increase the noise when the machine is running.

Isn't this tangled? Not even if it is small, not even if it is big. After all, I haven't actually done it. It's all on paper. I just give you the standard of calculation.

What is my choice? First, install a dreamer with 220 air volume on the first floor to see the effect. If it is comfortable to use, install a dream maker with 300 air volume on the second floor as a supplement to provide more air volume.

Now that the brand air volume is determined, the model is naturally locked-DM-XF220-1s.

I won't go into details when I place an order, and then I will wait for the delivery. When SF Express arrived home, the air column cushion was wrapped tightly.

Remove the air column cushion to expose the original package.

1.3 meters long and with a gross weight of nearly 60 kg, it's really difficult to move.

A QR code is attached to the outer package, and the instruction manual can be obtained by scanning the QR code (the paper version of the instruction manual is also attached to the package).

Open the outer package to see the accessory package+host.

The foam box is tightly wrapped to avoid damage during transportation.

Spare parts box list: ventilation pipe, sealing ring, spare parts package and air baby.

Stewed assorted food

The front section of the ventilation pipe is provided with a rainproof edge and a grille (detachable) to prevent small animals from entering.

At the rear end of the ventilation pipe (with a 4cm thick sealing ring), the design of the sealing ring is very necessary to avoid air leakage from the wall hole.

Schematic diagram of ventilation pipe assembly

According to the details of the host side, it can be seen that the workmanship is good, the paint surface is uniform, the seams are consistent, and the rounded corners are smooth. From the product details, the surface adopts SPCC baking paint technology (the baking paint technology used by Porsche) and has gone through hundreds of surface treatment processes. But it feels really good, smooth and delicate.

There are two locating pins on the back.

Schematic diagram of installing fixing bracket

The air inlet has an electric valve, which automatically closes when it is closed to prevent outdoor air from flowing back into the room from the ventilation pipe.

From ordering to delivery, installation and activation, the official customer service has always followed the process, and the service is generally good. On the day the machine arrived, the telephone number of the installation master came, so I made an appointment to wait for the door-to-door installation.

Because it needs drilling and involves professional equipment, the installation is free, so I won't elaborate on the installation process, and diy is not needed anyway.

Additional auxiliary mounting fixing paper

Attached to the water bag, intimate.

Installing ventilation pipe

Install the signal and have a look for yourself if you are interested.

The wall was drilled by boiling water for a long time.

After getting through, there is an air conditioning platform and a drainage pipe outside, just enough to put down the ventilation pipe, otherwise it will be embarrassing.

Installing hanger

After drilling, the wall latex paint is still damaged to some extent.

Machine installation is complete.

Filter element list

Initial effect of installation G02

Install M6 intermediate effect

Installing ion energy dust collection device

Install H 13 HEPA filter element.

Because of the clever figure-eight design, it not only expands the dust holding capacity, but also can plug two carbon bags in the gap to remove the odor of outdoor air.

used when a series is over

Regarding the functions of each filter element, I directly use official website diagram.

Among them, only M6 medium efficiency filter element and H 13 high efficiency HEPA filter element are consumables that need to be replaced. It is suggested that the replacement period is 3 months and 3-6 months respectively.

The official selling price is as follows

Ionization emission board is a plus item, not all new fans have it. It can release a large number of negative oxygen ions, which is beneficial to physical and mental health and belongs to the icing on the cake function.

What is controversial is the "ion energy dust collection device", which can achieve the purification effect by charging and adsorbing particles. Some air purifiers without consumables also use this method, which has the advantages of strong dust collection ability and economy (because there is no need to replace consumables, it also prolongs the service life of the rear HEPA filter). The biggest problem is that it will produce ozone, and excessive ozone is harmful to human body.

This machine is said to be ozone-free after being certified by an authoritative organization, and the certification number is attached, so it is necessary to check whether this is the case.

According to the test report issued by China Household Electrical Appliances Research Institute, under the maximum air volume, the 24-hour ozone concentration is 7.5ppb, far below the standard limit of 50ppb. Again, regardless of dosage, people who say toxicity are hooligans, so the safety of this equipment is still ok.

This machine uses a push-type mechanical buckle instead of a magnetic buckle. At first, I didn't understand why this "primitive" structure was adopted. Open the panel to find out the reason. I will talk about it later.

I have to say, the feeling of pressing it is still very crisp, and the touch and feedback of the keys are also good, but it is very difficult to close it and needs to be pressed hard. At first I thought it was a design defect, but later I learned that it was intentional by the designer. Let's look at the back of the panel first.

The mark on it is not injection molded by the mold, but extruded by the filter element.

The extensive use of this material ensures the tightness of the machine, and it is precisely because of this material that the panel needs a lot of force to buckle when it is closed, and the use of mechanical structure also thinks that it needs to apply lateral pressure for fixing, but magnetic attraction can not provide such a large force.

Never underestimate the importance of sealing, for example, although your motor can provide 300 meters? /h, but if the sealing performance of the fuselage is not good, air will directly enter the room from the gap of the machine without passing through the filter element, which reduces the purification efficiency and increases the energy consumption, which is also the difference between high-end machines and low-end machines.

Another point of direct praise is that this machine adopts off-board monitoring mode and comes with air babe, that is, the off-board air quality detector. The machine adopts Plantower PM2.5 laser sensor; Sweden imports Senseair carbon dioxide sensor; Sensirion imported temperature and humidity sensor from Switzerland.

It provides monitoring of four indicators: PM2.5, CO2, temperature and humidity, and can intelligently link the machine with the Internet to adapt to more usage scenarios (I didn't set it up because I turned it on 24 hours).

Why should we emphasize the importance of monitoring machines? Whether it is fresh air or clean air, the air around the machine is purified first and the quality is the best. Isn't it self-satisfaction to control the operation of the machine only by detecting the air quality around the machine? Slightly better than nothing, but definitely not the optimal solution.

The main engine is equipped with a microswitch, which automatically stops running after the panel is opened.

The maximum angle of the panel after opening is 90, so the space requirement on the side of the machine is not high.

Cleaning process of ion energy dust collector;

After the filter element is removed

It can be seen that the liner is filled with EPP in a large area, and its high-quality filling characteristics make the structural layout more compact and more suitable for home use.

(1) integrated structure increases air tightness, improves work efficiency and reduces energy consumption.

(2) Non-toxic and environment-friendly, without irritating smell.

(3) The pyramid silencing structure reduces the working noise.

EPP is the abbreviation of expanded polypropylene, which is the abbreviation of a new type of foamed plastic. EPP is a kind of polypropylene plastic foam material and a kind of high crystalline polymer/gas composite material with excellent performance. EPP, with its unique and superior performance, has become the fastest-growing environmentally-friendly new compression-resistant, cushioning and heat-insulating material. EPP is also an environmentally friendly material, which can be recycled and degraded naturally without causing white pollution. EPP has the advantages of light specific gravity, good elasticity, earthquake resistance and compression resistance, high deformation recovery rate, good absorption performance, oil resistance, acid resistance, alkali resistance, resistance to various chemical solvents, non-water absorption, insulation, heat resistance (-40 ~ 130℃), non-toxic and tasteless, and can be recycled at 100%, with almost no degradation in performance.

The picture below is the plan of my home. The red frame in the living room is the installation position of the new fan, the green frame in the master bedroom is air Beibei, and the green frame in the Chinese kitchen bar is Feixun Wukong M 1 air detector.

The next step is the actual measurement stage. Let's take a look at the measurement data of "open the air and close the bedroom door" for one night: CO2=2540 (mild hypoxia), PM2.5=2.

Data after opening the bedroom door for 3.5 hours: CO2=75 1 (mild hypoxia), PM2.5= 16.

It can be seen that in the absence of fresh air, the doors and windows may be too sealed. After a night's sleep, the dormitory is in a state of mild hypoxia.

Before looking at the use effect, let's make clear the standard of PM2.5.

We can see that the advantage of the United States is our 1/3 advantage. Basically, before heavy pollution, China's standards were one grade lower than those of the United States. This standard does not come from health, but is the result of compromise between the present situation of developing countries and the expectations of the World Health Organization. At present, China, Indian, Pakistani and other countries refer to this standard.

Therefore, only the WHO standard is really based on health and safety, that is, the annual average value of PM2.5 ≤ 10ug/m? , daily average ≤25ug/m? Then if you have the conditions at home, you should also refer to this standard.

As can be seen from the following figure: 12:00 February 20th12: 00 (the minimum air volume is always 60m? /h operation), the content of PM2.5 continued to decline.

Excluding the cooking period from 18: 00, during the rising process of outdoor PM2.5, indoor PM2.5 continued to decrease and finally remained within 10.

All the above indoor PM values are measured in the air in the master bedroom, not around the machine, and it is the minimum air volume. It can be said that it is beyond my expectation, because after all, the net area of the upper and lower floors of my house is 180 square meters, and I am still very satisfied with maintaining this level under the minimum air volume.

However, the premise may also be that the outdoor PM2.5 is not high and the processing pressure is not great. I have to say that this year's air is indeed much better than previous years, and there are only a handful of days to break 100.

Then let's take a look at the data of Feixun Wukong M 1 at the kitchen bar, which are basically the same. Except for the data of dinner stage at 18: 00-20: 00 every day, the rest time is kept below 10.

To sum up, there is no doubt about the ability to improve PM2.5. In fact, there is nothing to doubt, and it is not the focus of this article. For the northeast, the more important thing is actually the temperature!

After all, as a new wall-mounted fan, it is good to be able to charge auxiliary heat without heat exchange. But electric auxiliary heating is very tasteless. Why do you say that?

Take my machine as an example, the electric auxiliary heating power is 400w (actually it is already very low). If the calculation is based on 24-hour work, 24 hours ×0.4kw×0.525 yuan/kWh (Changchun, the first electricity tariff standard) ×3 1 day = 156 yuan, that is, one month when the auxiliary heating is turned on.

And how much does the electric auxiliary heat energy of 400w increase the inlet air temperature? Less than 5 degrees! In the winter when the temperature in the northeast is often below zero, this temperature is used as the top ball, so the auxiliary heat is still reserved for friends in the south.

What about people in the north? Don't forget that we have heating! As long as the heating is strong enough, cold air is a wool. Therefore, my advice to you is to evaluate the heating situation at home before deciding whether to start.

Next, let's talk about the heating situation in my home, which is still relatively strong. The temperature of the master bedroom facing south on the first floor is kept at 26-28℃

The temperature of the kitchen bar on the first floor is kept at 24-26℃

As can be seen from the above figure, since the new fan was turned on at 12:00-February 2012: 00, the temperature in the living room and bedroom has not fluctuated greatly, and the indoor temperature has dropped by about 1℃ regardless of the change of external weather.

For further verification, move the air baby from the bedroom to the living room under the fresh air fan.

Time: 65438+February 22nd 14: 18

14: 46 Turn on the new fan with a minimum air volume of 60m? /h operation

As can be seen from the figure below:

14:18-14: 46 when the new fan is not turned on, the temperature drops from 28℃ to 25℃, which is the temperature difference between the bedroom and the living room.

After 14: 46 was started, the temperature dropped from 25℃ to 22℃. Excluding the outdoor cooling factor, it can be simply and rudely considered that the operation of the new fan has reduced its environmental temperature by 3℃.

Combined with the experience, turning on the new fan can't feel the temperature drop in the living room, but sitting on the sofa next to the new fan can feel the wind. The above is the actual experience. As for whether it can be accepted, we should consider it comprehensively according to our own situation.

The working noise is 33dB-47dB, all of which are certified by professional institutions. I don't need to take my mobile phone to test it. The intuitive feeling is that when the air volume is the minimum, you can hardly feel the working noise. When the air volume is the maximum, you can hear the rotation of the motor, but it is not noisy.

As for the electricity bill, if the auxiliary heating is not turned on, the rated power of the machine is 43w. If 24 hours work, 24 hours ×0.043kw×0.525 yuan /kWh (Changchun, the first electricity tariff standard) =0.54 yuan, and the electricity bill for one day is only 0.54 yuan, I think it is quite energy-saving.

To sum up, so far, this machine has basically met my previous needs, so I am still quite satisfied. Others, such as the increase of electricity bill, working noise and temperature reduction, are also within my acceptable range.

Finally, what to buy should be decided according to your actual situation and needs. "My honey is your arsenic" is not groundless.