You can look at the mainstream brands such as Panasonic, Honeywell, Yuanda and Shine E for specific brands. The following is the purchase method of fresh air system, I hope it will help you.
1. Choose a brand
Although it can't be said that all brand products are necessarily good, the quality of non-brand products is basically not up to standard (Panasonic, Yuanda, Honeywell and Shine are all well-known brands in the market). Generally speaking, from the comprehensive factors such as standards, noise, heat exchange technology and filtration effect, Japanese and domestic independent brands of fresh air products are comparable, while German is the best. To distinguish brands intuitively, we can also look at the completeness of product lines, the richness of supporting auxiliary materials, the update rate of models, whether there is a official website, whether there are physical stores in the region, and so on. Go and see what the fresh air systems of the top ten brands have.
2. Central fresh air or wall-mounted fresh air?
Fresh air is divided into central type, floor type and wall type according to installation methods. Among them, the fresh air effect in the center of the pipeline is the best, but the pipeline is needed and can only be installed during decoration; Floor-standing fresh air is easy to install, without fixing and decoration restrictions; Wall-mounted fresh air: it is not limited by decoration and does not need to be piped, but the fresh air volume is less, and the fresh air outlet and exhaust outlet are relatively close, which can not fully exchange indoor air and is suitable for small rooms. Most of the fresh air systems have central fresh air fans, and some brands mainly use floor-mounted and wall-mounted fresh air, such as the wall-mounted fresh air of Defeilan, Manred and Odeo, and great floor-mounted fresh air.
3. Do you need a heat exchanger?
If the budget allows, it is best to choose the fresh air system with full heat exchanger, especially air conditioning in winter, especially when the home is dry and rainy in summer and particularly humid. The exchanger can recover damp heat energy and balance the temperature and humidity difference between indoor and outdoor. In the cold area in the north, the energy recovered by heat is dozens of times of the operating power of the new fan (saving the electricity bill of air conditioning).
4. Total heat or sensible heat
In practical application, heat recovery can be divided into total heat type and sensible heat type. Generally, the total heating type is adopted in the north, and the sensible heating type is generally adopted in the south. Sensible heat exchanger is a kind of heat exchanger, which can only exchange heat, but not humidity. The total heat exchanger can exchange both heat and humidity, and each has its own advantages. Sensible heat recovery should be equipped with condensate drain pipe.
5. Select air volume and pipe diameter.
Multiply the living area by the story height, and divide the air exchange times by 0.7 times per hour, and you can get the required fresh air volume per hour, that is, fresh air volume ≥ building area x building height x 0.7.
Calculation method of pipe diameter: πr (ventilation pipe diameter)? X6m/s (ideal wind speed) x60x60= ventilation (m? /h). Generally speaking, the models of commonly used new fans are:100/150/200/250/350, which can be purchased as required.
6. Look at the filtration system
It is best to use electrostatic precipitator and filter screen to increase purification efficiency and reduce later cost (electrostatic precipitator can be washed).
If HEPA filter is used as the filter, the level and quality of the filter directly determine the cleanliness of the air entering the room. The filter screen should have at least three kinds of filtering devices, namely, primary filtering, sub-high efficiency filtering and high efficiency filtering (the first one is to protect the latter two). The filter should be replaced 2-3 times a year. In addition, a good fresh air host is generally equipped with a filter replacement reminder function to ensure the normal use of the filtering function.
7. Look at the fresh air pipes.
Domestic fresh air systems generally use PVC pipes, which are not expensive to manufacture, but the interface is easy to accumulate dust and it is very troublesome to clean. It is best to choose imported food-grade seamless pipes. This kind of pipeline is generally very long, and the domestic abrasive is not that long, so it is difficult to make it, such as the pipeline equipped with the fresh air system of the new E.
8.DC motor or AC motor
Compared with AC motor, DC motor has more advantages: good speed regulation performance (stepless speed regulation can be easily realized), energy saving, high efficiency, high power factor, long service life, low vibration, low noise, low loss and continuous operation. Usually, they also have thermal protection and fault detection functions. At present, the application trend will gradually adopt DC motors, just like the popular DC motors in household air conditioners. At present, the best brand of the motor of the fresh air system host is the original EBM brand in Germany.
9. Look at heat preservation and silencing
The heat preservation and noise reduction of the shell of the top fresh air main machine tend to adopt the integral shell, instead of the traditional screw splicing of each board or splicing here. The integrated molding technology can achieve the ultimate sealing performance of the whole machine, and the thermal insulation and noise reduction performance will naturally achieve the ultimate. At the same time, the air leakage rate of the unit can be reduced to almost zero.
10. View the controller
The upper computer should have a good operation interface and accurate parameter control function. At present, LCD is generally used to control the switch panel.
1 1. Is there a bypass function?
When the difference between indoor and outdoor temperature and humidity is small, and the outside air is comfortable for human body, the unit will directly send the outdoor air into the room after filtering and purifying, and the flow path will bypass the overheating recovery module. This is a good function, which can save energy, reduce wind resistance, improve ventilation effect and reach the space needed by human body directly. This function needs to set an electric switch gas valve inside the main engine, which is controlled by a liquid crystal control switch.
12. Design and construction quality
Professional design and construction can ensure the efficient use of fresh air system. The position of the air supply outlet and the air outlet directly affects the fresh air effect, for example, the effect of sending the upper exhaust is better than that of sending the upper exhaust. At this time, you can look at the previous cases or field trips of the merchants to see if the final effect meets your own standards.