Dry goods: Summary of 48 knowledge points of fresh air system technology!

HC New Wind Network Today, Xiaobian summarized the 48 basic questions of the fresh air system technology , to see if you have answered your questions?

1. What is a new wind?

A: The fresh air system uses the new air blower unit, fresh air duct and tuyere to process the outdoor fresh air into the room, and exhaust the indoor dirty air through the air outlet, exhaust duct and fan; at the same time, ensure the stability of the indoor pressure.

2. What is the use of the new wind?

A: The fresh air can not clean the air by opening the window. It can reduce harmful substances and harmful gases in the indoor air, and ensure the oxygen content of the indoor air, which is good for health.

3. What types of fresh air are there?

A: There are four types of common air blowers in home improvement: one-way flow, self-balancing, two-way flow, and full heat exchange.

4. How much power is consumed?

Answer: The power consumption component of the new fan unit is the motor of the fan, which is equivalent to the power consumption of the fan. The power consumption of the new fan unit in the home is generally below 100W. The larger the unit's air volume, the greater the power consumption.

5. How is the noise?

A: The noise of household new fans is generally 30-40 decibels. Among the high, medium and low gears, the high speed noise is the largest and the low speed is the smallest.

6. How big is the new wind, how to calculate?

A: It can be calculated in two ways:

(1) Number of air changes: The number of home air changes is generally 0.75-1 times.

(2) Fresh air per capita: 30-50 cubic meters of fresh air per person per hour. For example: a 15 square master bedroom with a height of 2.5 meters. Calculate the hourly fresh air volume according to Method 1. 15*2.5*1=37.5 cubic meters. According to Method 2, the number of people in the master bedroom is calculated according to 2 people. The fresh air volume is 2*30=60 cubic two calculation results, and the larger one is selected as the selection basis, that is, the room needs 60 cubic meters of fresh air per hour. The remaining rooms are also calculated according to the method, and the sum of the total air volumes of the rooms is less than or equal to the maximum air volume of the selected new wind turbine group.

7. What is the difference between the occasions?

A: According to the number of air changes in different places and the amount of fresh air per capita, home improvement 0.75-1 times, shopping mall 1.6-3.9 times, computer room 1.1-2.7 times, gymnasium 2.5-6.3 times, small meeting rooms 3-5 times, large-scale meeting 8 times around the room, the hotel, KTV 6-8 times, calculate the total fresh air volume, and then choose the fan model.

8. Does the duct have a relationship with the tuyere?

A: It is related to the fact that the fresh air is sent into the room through the fresh air duct and the tuyere. If the air inlet and the air duct are not tightly connected, it will cause air leakage. Therefore, the air outlet should be the same as the air duct connected to it.

9. What does full heat exchange mean? what is it used for?

A: Total heat includes sensible heat and latent heat. Sensible heat: heat transferred by high temperature air and low temperature air due to temperature difference; latent heat: heat emitted by water vapor condensation in high temperature air. Full heat exchange saves energy, reduces or increases the temperature of entering indoor air, and reduces air conditioning load.

10. What is the balance fan and the one-way flow fan?

A: Balanced fan can be understood as adding a branch to the fan, more than one point. A single-class fan can only be used as an inlet or exhaust.

11. What is the difference between them?

Answer: The one-way flow fan enters the room with only one main pipe. It is necessary to make a three-way branch when entering each room. The main pipe needs to be changed according to the change of air volume. The self-balanced fan receives multiple pipes. Each pipe is usually accompanied by a separate air outlet.

12. What are the main ideas for host installation?

Answer: The hoisting of the main engine should be kept horizontal and firm, and the distance between the top and the ceiling should be no less than two centimeters, leaving a space of not less than 50 cm from the wall for easy maintenance.

13. What are the requirements for air outlet installation?

Answer: The tuyere is installed firmly and tightly connected with the air duct, and the air outlet is adjusted to a suitable opening degree.

14. How to install the wind?

Answer: The underground air outlet pipe is generally laid in the floor heating insulation layer. The ground air outlet can be installed on the ground or the wall. The branching device is installed in the corner (convenient to handle the main riser). The order from the outside to the inside is: stainless steel air outlet—— Fresh air hose - PVC main pipe - fresh air hose - fresh air main machine - fresh air hose - pvc main - - branch - air volume control valve - ground air flat tube (direct, elbow) - ground air outlet.

15. How to install the wind?

Answer: The fresh air and exhaust pipes on the wind are all PVC pipes, and they are all hidden in the ceiling. When installing, try to avoid crossover and minimize the length of the exhaust pipe and the length of the hose.

16. What is the difference between the wind and the wind?

Answer: The air outlet will lay the exhaust duct and the new air duct in layers, which avoids the situation that the air volume is affected by the crossover of the pipeline during construction, and saves the space above the ceiling. Especially in the case where some rooms are not suspended, the air supply and air outlets can be arranged diagonally with the ground air supply, and the fresh air is sent back, the airflow organization is more reasonable, and the comfort is higher. But the cost is 20%-40% higher than the upper air supply.

17. How big is the home machine?

A: Commonly used household new fan models are: 100 air volume / 150 air volume / 200 air volume / 250 air volume / 350 air volume.

18. What should I pay attention to after the installation?

Answer: After the installation is completed, the air volume of each air outlet should be adjusted. The upper air supply can adjust the air opening degree, and the ground air supply air volume adjustment valve ensures that the system does not leak air.

19. Does the fresh air filter?

A: Belt, there is a filter screen in the new fan unit.

20. How does the full heat exchange work?

Answer: The sensible heat and latent heat recovery are carried out by using the temperature difference between the fresh air and the exhaust airflow and the partial pressure difference of the water vapor.

21. What are the requirements for installing a fresh air position?

Answer: The upper space of the ceiling meets the installation height requirements, and the distance from the wall meets the maintenance requirements? The impact on the noise is not high, the indoor piping is convenient, the supervisor is convenient to take out the outdoor, and the distance between the two main supervisors is guaranteed.

22. How to carry out maintenance in the late stage of the new wind?

A: If the fan is running normally, clean the filter, air outlet and other components. Check the controller and wiring if it is not running.

23. How to choose the fresh air outlet?

Answer: Generally, the adjustable air outlet is selected. When the air volume is uneven, the air volume of each room can be adjusted, and the air outlet model can be selected according to the air volume and the wind speed.

24. Is the full heat exchanger core used for cleaning for a long time?

A: Use. It can be cleaned with a vacuum cleaner or a hair dryer.

25. What is the minimum noise value of a silent new fan?

A: According to the size of the air volume, ranging from 15 decibels to 50 decibels.

26. How do you install a fresh air pipe?

A: Connect with a PVC size head. The diameter of the pipe diameter after the reduction is determined according to the air volume and the wind speed.

27. What are the installation methods of the new wind?

A: Send it back and send it back.

28. What are the advantages of the fresh air controller?

A: It can automatically detect the indoor carbon dioxide concentration and volatile organic compound content, automatically control the start and stop of the fan and the wind speed by detecting the indoor air pollution index, create a good environment for the family while saving energy, and also effectively detect the indoor temperature. ,humidity. It can also be used to control the wind speed start and stop.

29. Is the fresh air controller BW810 suitable for all fresh air main engines?

Answer: No, 810 is an active output controller. It controls the high, medium and low speed operation of the fan through zero fire line. It is suitable for the type of high, medium and low speed line of the fan. It is not suitable for the type of high, medium and low speed line control line.

30. What is the difference between full heat exchange and two-way flow?

A: The full heat exchange fan can recover the cold or heat in the room and reduce the loss of indoor heat load or cold load. Bidirectional flow cannot

31. What does the new style English letter "WB" stand for?

A: WB stands for thin and light fan

32. What kind of house is the self-balancing new fan suitable for?

A: There is no need to install a branching device. It is suitable for a house with multiple rooms. The multiple air outlets of the fan can be adjusted according to the actual application to achieve airflow balance in each room.

33. How many tunes need to be installed in a room?

A: This is determined according to the size of the room and the size of the tuyere. The area of ​​the room * the height of the floor * the number of air changes = the number of fresh air outlets = the fresh air volume / the cross section of the tuyere / the wind speed of the duct. When the wind speed of the air outlet is 2.5 m/s: the air volume of the 75 air outlet is about 35 cubic meters per hour, and the air volume of the 100 air outlet is about 70 cubic meters per hour.

34. How can the new air outlet be adjusted and the louver?

A: The adjustable air outlet is suitable for adjusting the opening degree of the air outlet. The louver is mainly to adjust the wind direction. Generally, when the room size is different, it is recommended to use only the adjustable air outlet, followed by the visual problem and the customer's request.

35. How long does the fresh air main engine connection hose have to be connected, does it have an influence on the air volume?

A: It is generally recommended that the two pipes be 20-50cm between each other. What is the special case (what is special)? It can be lengthened appropriately, but the hose is discounted as much as possible because the inner wall of the hose is not smooth, and the second is that the hose is easy to wrinkle when it is long, which will increase the wind resistance inside the pipe and affect the overall air volume. Exceeding 1M will affect more than 10% of the total air volume.

36. Can the house be renovated with new air?

A: Yes, the renovated house can recommend the customer to install a wall-mounted new fan. If you want to install the central fresh air system, you need to change the decoration.

37. How to clean the fresh air filter?

Answer: After cleaning with a vacuum cleaner, wash it with water. It is generally recommended to clean it once in the first quarter. To ensure better ventilation and a good indoor environment.

38. Does the fresh air controller need to connect to other lines besides the power cord?

Answer: In addition to the power line, it should be connected to the high, medium and low speed control lines of the new fan.

39. How does a one-way flow new fan operate?

A: One-way flow, as the name suggests, has only one fan, which can only supply air or exhaust. Generally, when installing a one-way flow fan, it is recommended to use two units, one for main delivery and one for main return.

40. What is the difference between the air outlet and the air outlet on the floor? What is the effect? If the customer considers the effect, is it recommended to be mounted on the wall or on the floor?

A: When it is installed on the ground, it is easy to have stolen objects or small items falling in when the customer cleans. The two are the same in effect. It is generally recommended that the customer install on the wall.

41. Can the two models of the main unit and accessories be mixed with each other? Those can't?

A: The mainframe with the same caliber can be connected to the same air duct. If it is two brands of fans, the lower air supply fittings cannot be mixed.

42. Is the wiring method of the three-speed switch and the liquid crystal controller the same?

Answer: The three-speed switch is a passive control switch. It does not need to be connected to the power supply. The liquid crystal controller is divided into active and passive. It needs to be connected to the zero fire line to supply power to the panel.

43. Are the hosts hanging from the bathroom? How to fix? How to reserve the inspection port?

A: Not necessarily, depending on the situation, it is generally recommended to be installed in the bathroom kitchen. Fixing hanging wire and pulling explosion, the principle is the same as that of expansion screw. There are lifting holes on the main machine. The lifting holes should be padded up and down. When the horizontal nut is tightened, it is recommended to add a cushion. The inspection port is generally left at the wiring side of 450*450 size.

44. What is the difference between the wiring of the fixed frequency and variable frequency mainframe?

Answer: The fixed frequency host does not lead the fire line, the zero fire line is led to the controller, the fan will be charged when the high, medium and low speed switches are closed, and the fan is running; while the variable frequency main unit is always energized, the signal fan is closed by the high, medium and low speed lines. Will work.

45. Sometimes there is no hose for the air outlet. Can the hose be larger?

A: If so, what effect does the effect have? If not, why? If there is no matching hose, it can be bigger. If the interface is sealed, it will have no effect, but it can't be small, it will increase the difficulty of the link, and the wind resistance will increase.

46. ​​When the living room and the restaurant are together, the overall area is large, so that it is better to use less air outlets, or is it better to have multiple small air outlets? why? For example, if two halls are together, is it better to use 4 110 vents or 8 75 vents?

A: It is generally recommended that there should not be too many outlets, and the air volume will be sufficient. The air outlet of the 75 is about 15 square meters, and the air outlet of 100 is about 30 square meters.

47. Do you need a venting port for the walkway connecting the living room and each room?

A: No, the air is flowing, and the space for circulation can be designed as long as it meets the air volume requirements.

48. The customer gives a 200-flat house, living room, dining room, kitchen, bathroom, study, master bedroom, second bedroom, etc. When doing fresh air, you need to do fresh air in those rooms. Those who don't do it?

A: The general guest restaurant, bedroom, and study must be done. The kitchen and bathroom are not recommended. First, because the ventilation effect is different in one place, the number of air changes is different, but the smell of the bathroom kitchen is prevented from entering other rooms. If the customer requests to install, you can do a new exhaust.

Editor in charge: Carman