Analysis of breathing curtain wall structure and shading principle

In recent years, the development of building curtain wall is becoming more and more intelligent, scientific and technological, energy-saving, in order to adapt to this development, some domestic companies have introduced new technology of breathing curtain wall from Germany, this breathing curtain wall is also known as double curtain wall or hot channel curtain wall. Respiratory curtain wall can be divided into two categories;

1. Closed internal circulation system hot channel curtain wall

2. Open external circulation system hot channel curtain wall

The breathing curtain wall plays a very important role in improving the heat preservation, heat insulation and sound insulation performance of the building curtain wall, that is to say, the breathing curtain wall has excellent energy saving performance. Now on the open external circulation system hot channel curtain wall to do some introduction.

Working Principle of 2. Open External Circulating Hot Channel Curtain Wall

The open external circulation breathing curtain wall means that the air enters the hot channel space from the lower channel of the outer curtain wall, and then is discharged from the upper exhaust outlet of the outer curtain wall, while the inner curtain wall is completely closed. The inner curtain wall of the open outer circulation breathing curtain wall generally adopts hollow glass or Low-E glass, the profile is heat insulation (or heat-cut) profile, and the outer curtain wall adopts the open curtain wall structure made of single glass. Open external circulation breathing curtain wall can be completely rely on natural ventilation, do not need to rely on special equipment, maintenance and operation costs are low, is currently more widely used in the form of breathing curtain wall. The air inlet and air outlet of the open external circulation breathing curtain wall can be opened and closed. In summer, the air inlet and air outlet are opened, and the hot air forms a bottom-up air flow (relevant tests prove that the speed of this hot air flow can reach 0.6 m/s), taking away the heat generated by sunshine in the hot passage, reducing the outer surface temperature of the inner curtain wall, reducing the load of air conditioning and refrigeration, saving energy and reducing energy consumption; in winter, the air inlet and exhaust vents are closed, and the heat channel becomes a closed greenhouse due to the increase in temperature due to sunlight, which improves the outer surface temperature of the inner curtain wall, plays a role in heat preservation, and reduces the operating cost of building heating. In addition, the open external circulation breathing curtain wall can also be set up in the hot channel according to the need of adjustable aluminum alloy blinds or electric shutter, effectively adjust the sunlight. According to the spring and autumn and summer and winter, the situation is described as follows:

1. Spring and autumn; When you need to take a breath, you can open the sunshade curtain and indoor break hot. The air inlet is equipped with an insect-proof net and a removable filtering device, which can prevent insects from entering and greatly reduce the concentration of dust in the gas, so that the air entering the room is clean and fresh. The filter unit can be cleaned periodically.

2. In summer; put down the sunshade to block direct sunlight into the room. At the same time, the sunlight causes the air temperature in the box unit to rise, and the hot air flow rises due to the "chimney" effect and is discharged to the outside through the upper air outlet. The temperature in the channel is reduced, thereby reducing the heat exchange between the channel and the chamber.

3. In winter; open the sunshade to let the sun shine directly into the room. At the same time, sunlight increases the temperature of the air in the box unit, reducing the heat exchange between the channel and the room.

Structural characteristics of 3. breathing curtain wall

The structural characteristics of the breathing curtain wall are manifested in its double-layer curtain wall structure, which is manifested in the use of thermal channel space. The structural characteristics of the open external circulation breathing curtain wall structure are as follows:

Structural features of open external circulation breathing curtain wall:

(1) The inner curtain wall can be insulated (or heat-cut) open frame curtain wall or insulated (or heat-cut) unit curtain wall, and the outer curtain wall can be point-supported glass curtain wall, etc;

(2) The inner curtain wall usually adopts hollow glass, and the outer curtain wall usually adopts single glass; and the point-connected glass curtain wall is mostly used.

(3) The inner curtain wall is completely closed, and the air flow is carried out between the outdoor and the hot channel;

(4) The distance between the inner and outer two layers of curtain wall can be designed to be wide, generally 500~600mm;

(5) Outer top louver vents. A stainless steel insect net is installed inside the vent to prevent birds and insects from entering the box. The exchange of hot air does not need to be completed by special equipment, and can be completely carried out by natural ventilation of air, and the operating cost is low;

(6) The inner curtain wall is equipped with an opening door, and the passage is equipped with a walking steel frame to enter the passage for maintenance and cleaning;

(7) adjustable "Jinyang" aluminum alloy blinds or "Jinyang" electric roller blinds can be set up in the hot passage according to the needs to effectively adjust the sunlight.

(8) Set vertical partition at necessary position. The partition material can be steel plate, aluminum plate or glass.

Energy saving performance of 4. breathing curtain wall

According to experts estimate that about 50% of the world's energy consumption is building energy consumption, and the energy lost from ordinary windows is 5 to 6 times that of ordinary solid walls. Although the traditional single-layer glass curtain wall is better than ordinary windows in thermal performance, it is still a weak link in building energy consumption. The advantages of breathing curtain wall are fully reflected in its double-layer curtain wall structure, which is superior to the traditional single-layer glass curtain wall in terms of sunlight, heat radiation and heat conduction. According to relevant data from Germany, compared with the energy consumption of the traditional single-layer glass curtain wall, the breathing curtain wall can save 42% ~ 52% of energy during heating and 38% ~ 60% of energy during cooling. It can be seen that the breathing curtain wall has excellent energy-saving performance. In addition, the breathing curtain wall due to the use of double curtain wall structure, and a layer of curtain wall is usually made of hollow glass, the sound insulation effect is also very significant, can greatly improve the corresponding office or living conditions.

5. closing remarks

Compared with the ordinary single-storey curtain wall, the breathing curtain wall adds a barrier, and the one-time manufacturing cost is increased. However, from the feedback of the use effect of the breathing curtain wall that has been put into use in Germany, the electricity cost saved by the breathing curtain wall after only six years of use is equivalent to the cost of the single-storey curtain wall, while the service life of the building curtain wall can reach at least 2. 30 years, and the electricity cost saved will be more considerable, therefore, the energy-saving performance of the breathing curtain wall is very excellent. In addition, the breathing curtain wall usually uses colorless glass, which can not only reduce light reflection, but also ensure good permeability inside and outside the building. However, at present, there is no national standard and specification for respiratory curtain wall in China, and the physical properties of respiratory curtain wall cannot be tested in China. A series of tests still need to be carried out abroad. Therefore, the application and promotion of respiratory curtain wall in China still need the active actions of relevant national departments and construction curtain wall enterprises, It is believed that respiratory curtain wall will become a trend product in the construction curtain wall market in the near future.

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