Core Advantages and Application Cases of Aluminum-Plastic Co-Extruded Profiles in the Field of Building Energy Saving

Under the background of the global active promotion of energy saving and emission reduction, the building industry, as a large energy consumer, its energy saving transformation is crucial. Doors and windows, as key parts of the building envelope, occupy a considerable proportion of building energy consumption. According to relevant studies, the energy consumption of windows and doors accounts for about 30% of the total energy consumption of buildings. Therefore, it is of great significance to choose energy-efficient window and door profiles to reduce building energy consumption. Aluminum-plastic co-extruded profiles, by virtue of their unique structure and excellent performance, have demonstrated significant core advantages in the field of building energy saving, and have achieved excellent energy-saving results in many actual building projects.

The unique structure of aluminum-plastic co-extruded profiles

Aluminum-plastic co-extruded profile cleverly composite aluminum alloy and foamed plastic together. The internal aluminum alloy is used as the supporting skeleton, and high-strength aluminum alloy materials such as 6063-T5 are mostly used, which has the characteristics of low density but high strength, and its tensile strength can reach more than 260MPa, which provides stable and reliable support for the profiles and ensures that they can withstand all kinds of external forces without deformation in the process of installation and long-term use of doors and windows, which guarantees the safety and stability of the doors and windows. The aluminum alloy skeleton provides stable and reliable support for the profile.

On the outside of the aluminum alloy skeleton, a layer of foamed plastic is tightly wrapped. This layer of foamed plastic is generally made through advanced rigid crust micro-foaming technology, in the aluminum liner co-extrusion, the heat melted plastic uniformly through the mold foam, tightly wrapped in the aluminum liner, the formation of bubble holes, density and suitable and aluminum alloy skeleton combined with a solid insulation layer. A large number of tiny closed bubbles inside the foamed plastic, so that it has a very low thermal conductivity, usually only 0.03 - 0.04W / (m ¡K), is the key factor in realizing the profile's high efficiency of thermal insulation.

Aluminum-plastic co-extruded profiles in the reduction of energy consumption in the building of outstanding performance

Reduced heat transfer and stabilized indoor temperature

In winter, when the indoor temperature is higher than the outdoor temperature, heat is continuously transferred to the outdoor area through doors, windows and other enclosure structures, resulting in the loss of indoor heat and the need to consume more energy for heating. Although the aluminum alloy skeleton of the aluminum-plastic co-extruded profile has a certain degree of thermal conductivity, it is wrapped in an all-around package by the outer foam plastic insulation layer, which cuts off most of the paths of heat conduction. Foam plastic insulation layer in the closed bubble filled with air, air's low thermal conductivity makes it difficult for heat to penetrate, greatly reducing the loss of indoor heat in winter, so that indoor warmth can be maintained for a long time, reducing the length of time and energy consumption of heating equipment. Relevant research shows that compared with ordinary aluminum alloy doors and windows, aluminum-plastic co-extruded doors and windows in the same indoor and outdoor temperature difference conditions, the heat transfer can be reduced by more than 50%.

In summer, when the outdoor temperature is higher than indoor temperature, aluminum-plastic co-extruded profiles can also play a powerful role in heat insulation, blocking the influx of outdoor heat into the room, effectively reducing the load on the indoor air conditioning and refrigeration system, reducing refrigeration energy consumption. For example, in the hot southern cities, the installation of aluminum-plastic co-extruded windows and doors of the building, indoor air conditioning frequency and running time is significantly reduced, it is estimated that the installation of ordinary windows and doors of the building can be compared to save 20% -30% of the energy consumption of refrigeration.

Improve airtightness, reduce air infiltration heat loss

The airtightness of doors and windows is one of the important factors affecting the energy consumption of buildings. Aluminum-plastic co-extruded profiles usually adopt a multi-channel sealing design between the window frame and the window sash, with high-quality sealing tape, such as EPDM tape. This kind of adhesive strip has good elasticity, weather resistance and sealing performance, and when the doors and windows are closed, it can fit closely to form an efficient seal and effectively prevent air infiltration. According to relevant research, the air infiltration heat loss of windows and doors accounts for about 20% - 30% of the total heat loss of windows and doors, and the good airtightness of aluminum-plastic co-extruded profiles can significantly reduce this part of the heat loss, and further enhance the energy-saving effect of the building.

Demonstration of energy saving data and results in real building projects

Case study of a project in a cold region in the north of China

In a residential district project in a cold region in the north of China, there are 50 residential buildings in the district, with a total building area of 200,000 square meters. In the selection of windows and doors, aluminum-plastic co-extruded profiles were chosen. In the first heating season after the project was put into use, energy consumption monitoring was carried out on some of the households in the district and compared with the neighboring districts using ordinary aluminum doors and windows with broken bridges.

The monitoring data shows that the average indoor temperature of the households with aluminum co-extruded windows and doors in the district stably stays between 22℃ - 24℃, while the average indoor temperature of the households in the neighboring districts with ordinary aluminum windows and doors is between 20℃ - 22℃. In terms of heating energy consumption, the average monthly heating energy consumption per square meter of households in the district is 15 kWh, while the surrounding districts are as high as 20 kWh. Calculations show that the total heating energy consumption of the neighborhood during the heating season is about 25% lower than that of the neighboring neighborhoods. Residents reported that the indoor temperature was more stable and heating costs were reduced after the use of aluminum co-extruded windows and doors.

Case study in a hot summer and warm winter area in the south

In a commercial office building project in a hot summer and warm winter area in the south, the office building has 20 floors and a floor area of 50,000 square meters. After the project adopts aluminum-plastic co-extruded profile doors and windows, during the summer cooling period, the air conditioning system operation data in the office building is analyzed and compared with similar office buildings in the same region adopting ordinary aluminum alloy doors and windows.

The data show that the office building with aluminum co-extruded windows and doors, the indoor air conditioning set temperature at 26 ℃, the indoor temperature can be maintained steadily between 25 ℃ - 27 ℃, indoor moderation is higher. Office buildings with ordinary aluminum alloy doors and windows, the indoor temperature fluctuation is larger, in the air conditioning set temperature of 26 ℃, the indoor temperature will often exceed 28 ℃. In terms of air-conditioning energy consumption, the average air-conditioning energy consumption per square meter per month in summer for the office building with aluminum-plastic co-extruded windows and doors is 12 kWh, while it is as high as 16 kWh for the office building with ordinary aluminum alloy windows and doors. Statistically, the total air-conditioning energy consumption of the office building in the summer cooling season is about 25% lower than that of similar office buildings in the same area. According to the property manager of the office building, the use of aluminum co-extruded windows and doors has significantly reduced the operating pressure of the air-conditioning system and the frequency of maintenance of the equipment.