In China now fresh air system is mainly used in hospitals, hotels, shopping malls and office buildings, residential applications are rare. East China Design Institute of HVAC chief engineer Xu Lao wrote a report a few days ago, the report mentioned, now about 99% of the residential is not installed new air system, on the one hand, people do not have this awareness, the means of ventilation is generally open windows; the second, residential developers in the early stages of architectural design and did not consider the new air system, or the awareness of the problem, people do not attach importance to the developer to pay even less attention.
In fact, a residential fresh air system is necessary. I give the owner a few suggestions from my knowledge of the new air system:
One, quantitative ventilation. Quantitative ventilation is actually more reasonable than open window ventilation, the world's most widely used mechanical ventilation equipment in several countries, Germany, Japan, the United States. These countries, indoor ventilation standards are written into the building design specifications, China also has, but China is not mandatory, China is 0.7 times / h, what is the concept of it, more than an hour's time, all the air in the home to be replaced by fresh outdoor air. Considering the air volume wind speed, open windows can not be installed to achieve this standard indoor ventilation, and the summer and winter windows are generally closed, ventilation just rely on the morning and evening hours to open the windows to ventilate is far from enough.
The Germans are doing a good job in mechanical ventilation in the world. Germany's mechanical ventilation equipment, that is, we say the new air system, is not the delivery of housing after the owners to install their own. There is a reason why developers consider mechanical ventilation equipment at the beginning of the architectural design. As we all know, the airtightness of residential doors and windows in Germany is very high, and the air leakage rate of doors and windows in China is very high. Germans have high airtightness of doors and windows, so they generally use mechanical ventilation equipment for quantitative ventilation, on the one hand, the dust in the air is filtered out, sent into the clean air indoors, the second, the Germans do not use air-conditioning, mechanical ventilation equipment in the use of total heat exchanger, the benefits of total heat exchanger is a certain sense of constant temperature and humidity, the temperature difference between Germany is not as big as China, so a set of mechanical ventilation equipment to resolve the A set of mechanical ventilation equipment to solve the air filtration problems, temperature problems, humidity problems and quantitative fresh air. German brands of fresh air systems are now sold in China, and they have improved the filtration efficiency because the haze in China is too serious. Not enough to be more expensive, I'll go into more detail when I answer the second question.
Two, the problem of opening windows or not. This problem so many people have, we are most accustomed to the practice of getting up first thing in the morning, open the window for air. Starting last year, we began to get entangled, because the windows can not be opened, outside are haze, open the window, it is doing a human purifier, closed the window instead of more secure (in fact, China's windows and doors leakage rate is so high, closed the window is still not safe). But close the window, the home is very stuffy, the worst is the summer, the weather is hot and humid, wood furniture ah, paint ah what began to emit formaldehyde, benzene. This is actually very scary, now acute leukemia is getting younger and younger, and people pay so much attention to the decoration and decoration is not unrelated.
My family installed a new wind system, open windows is not my main consideration, closed the window of the mechanical ventilation is what I think is more reasonable, I also have a consideration is that my family floor is low, behind the road, open the window is very noisy, the new wind system to help me solve the problem, I'll take it as a value-added bar.
Three, haze. In fact, it was from the end of last year that the haze, people began to realize how bad the air environment is . This year is actually worse than last year. According to reason, the summer haze should be the weakest, but this year, this area of Jiangsu, the entire September before the weather can be counted on the blue sky, I estimate that the next few months may be haze than the same period last year, the situation is much more severe. To solve the haze problem, the first reaction is the air purifier. Air purifier is an effective way to solve the haze, but it is a means of emergency, specific you can refer to another question (air purifier and new air system how to choose between?). The new air system compared to the air purifier, the haze problem can certainly be solved, but in the purchase of the new air system, be sure to look at the filtration efficiency, look at what filtration level is used, the minimum should reach the European standard F9 level, otherwise it can not be effectively filtered out of the haze and dust. Fresh air system than air more than a fresh air and total heat exchange (not every set of fresh air, depending on the configuration). That is, air purification is a module of the new air system, and the new air system because of the replacement of the old and new air, the fresh air is sent directly in, the oxygen is plentiful, and the polluted air in the home is pumped out. The new air system makes more sense ah.
The second question, the cost and points to note.
Cost: the new air system in the first few years is mainly to do office buildings and other public **** building, several brand practices is a price war, so now the price of domestic new air system is not high. Like Panasonic, Far Eastern, Daikin, these brands are not bad, some thousands of some tens of thousands, depending on the configuration. Procurement of new air systems should be more comparisons, especially a few key data. I listed below.
Air volume: according to the living area of the home (kitchen and bathroom with exhaust, does not count) multiplied by the floor height, divided by the number of air changes per hour 0.7 times the standard, you can get the amount of fresh air you need in your home. Generally you use this algorithm to calculate, sell new air will also feel that you are very professional, treating professional customers, they certainly will not dare to sloppy.
Piping: the piping of the new air system is very critical, it is the main channel connecting the outdoor air and indoor air. Domestic fresh air is cheap one is cheap in the pipeline, the second is cheap in the motor. Domestic new air system is generally used PVC pipe, production cost is not high, it is also very easy to purchase, but cleaning is very troublesome, the interface is easy to accumulate dust, and it is difficult to clean up. It is best to use imported seamless interface food-grade pipe. This type of pipe is usually very long, and domestic grinders are not so long, making it difficult to make and the process is not up to scratch. Domestic now on sale, I know now only Germany Dephina villa air system with this pipe, but their villa system to about 300,000, there are ionizers, can be constant temperature and humidity, is a good thing, but it is very expensive. Other brands are PVC pipe, I recommend in the procurement requirements manufacturers with food-grade piping, late maintenance is really important.
Filtration: mentioned above, below the European standard F9 level, the basic filtration device is a pose. And at least three filtration devices, primary filtration, sub-high efficiency and high efficiency filtration. The first is to protect the back two, is to filter large particles. The filters have to be replaced once or twice a year. When purchasing a new air conditioning system, also ask about the price of consumables, how to buy them, and the ease of installation.
Full heat exchange: it is best to have full heat exchange. Winter with air conditioning, the home is particularly hungry and dry, summer yellow plum days, the home is particularly humid, the recovery of humidity heat energy, is to balance the humidity. There are two benefits of installing full heat exchange in the new air system, one is to balance the humidity in the house, and the other is to send the air temperature into the house closer to the room temperature. For example, in winter, outside one degree below zero, with full heat exchange (according to the imported machine count ah), the air sent into the room is about 17 degrees, more energy efficient.
The more valuable part of the new air system is the total heat exchange, when you buy the machine, note that the total heat exchange is not the same as heat exchange. Heat exchange and induction temperature is not the same. Everyone is publicizing the full heat exchange, look carefully at its heat exchange data, you will understand is not the full heat exchange. There is a well-known brand to full heat exchange as a selling point of the new air system, but look at the details of the product, found that there is only the role of sensing the temperature of the fresh air, to put it bluntly, the thermometer can be realized. Be careful when choosing. There can also ask a question, what permeable membrane is used for total heat exchange? The Japanese use a paper membrane, not anti-freeze, the Germans use polymer materials, it is recommended to choose the German ah, full heat exchange module is bad and then change, and expensive and troublesome, not as good as a one-step solution.