Development trend of integrated energy-saving windows and doors with built-in sun shading louvers
The national standards related to building energy efficiency put forward new and higher requirements for the building sunshade industry. Building acceptance must meet the following standards and specifications:
I. Design Standard for Energy Efficiency of Public Buildings GB50189-2015
In regions with hot summers and warm winters, hot summers and cold winters, and mild climates, shading measures should be taken for all exterior windows (including transparent curtain walls) facing different directions;
Buildings in cold regions should adopt shading measures. Movable external shading should be installed for east-west orientation, and horizontal external shading should be installed for south orientation.
II. "Thermal Design Code for Civil Buildings" GB50176-2016
In regions south of the Tropic of Cancer, it is advisable to design building shading for all directional door and window openings;
In regions north of the Tropic of Cancer, which experience hot summers and warm winters, or hot summers and cold winters, building shading should be designed for door and window openings facing away from the north;
Building shading should be designed for door and window openings facing east, west, and horizontally in cold Zone B.
III. General Code for Building Energy Efficiency and Renewable Energy Utilization GB55015-2021
In regions with hot summers and warm winters, as well as hot summers and cold winters, Class A public buildings should adopt shading measures for their south, east, and west-facing external windows and transparent curtain walls;
According to the requirements of the standard：
The form and application of movable building shading is imperative!
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Modern buildings are an important part of energy consumption, and building energy conservation has become a very high social concern. With the continuous improvement of national policies and the continuous improvement of energy conservation requirements for civil and industrial buildings, it is required that doors and windows (accounting for more than 60% of the total building energy consumption) should be sunshaded and insulated in summer and heated and insulated in winter.
1.Heat transfer coefficient K value
① Energy-saving doors and windows: K value ≤ 2.4W/m².k, SC ≤ 0.25, shading coefficient in winter ≥ 0.60
② Low-energy doors and windows: K value ≤ 1.8-2.0W/m².k, SC ≤ 0.25, shading coefficient in winter ≥ 0.60
③ Ultra-low energy consumption and energy-saving doors and windows: K value ≤1.6W/m².k, SC ≤0.25, shading coefficient in winter ≥0.60
④ Near-zero energy consumption energy-saving doors and windows: K value ≤ 1.2W/m².k, SC ≤ 0.25, shading coefficient in winter ≥ 0.60
⑤ Zero-energy and energy-saving doors and windows: K value ≤ 0.8-1.0W/m².k, SC ≤ 0.25, shading coefficient in winter ≥ 0.60
2.The shading coefficient SC shall be less than 0.3,
3.The visible light transmittance shall be greater than 0.65,
After repeated testing and verification, SDLD's built-in louver insulating glass can meet the three rigidity index requirements of the above national standards for building energy-saving doors and windows. It has also obtained the CABR energy-saving product certification of China Academy of Building Sciences, met the requirements of the Ministry of Housing and Urban Rural Development of the People's Republic of China that "energy-saving doors and windows should be integrated with sunshade products", won the "National Science and Technology Achievement Promotion Project in the Construction Industry" awarded by the Ministry of Housing and Urban Rural Development, and has been fully recognized by market and industry experts, and has gradually occupied a leading position in the domestic and foreign sunshade field.
Comparison of main forms, advantages and disadvantages of traditional external shading
Comparison of advantages and disadvantages between built-in sunshade hollow shutters and outdoor sunshade fabric soft roller shades
uilt-in Venetian Blind Insulated Glass Technology Features:
1. It offers shading and heat insulation in summer, heating and insulation in winter, allowing for natural lighting and view exposure while shading, facilitating natural ventilation, resisting wind and noise, and ensuring convenient and safe maintenance.
2. It features a high level of integration for shading of doors and windows, without being limited by the size of the opening, with anti-aging properties, fire resistance, self-cleaning and pollution prevention capabilities, and without affecting the appearance of the building.
The integrated energy-saving doors and windows with built-in sunshade blinds and transparent glass curtain walls combine the functions of sound, light and heat control. It is the ideal choice for energy-saving doors and windows! It can perfectly achieve the comprehensive effects of heating and insulation in winter, shading and heat insulation in summer, adjusting light and blocking noise; especially suitable for coastal cities with frequent typhoon weather and those with hot summers and cold winters.
Comparison of construction cost between integrated energy-saving doors and windows with built-in sunshade blinds and outdoor sunshade roller shutters
Note: Since the external sunshade roller shutter does not contribute to the heat transfer coefficient of the entire window when retracted, only by using triple-glazed double-cavity insulating glass can the energy-saving performance of doors and windows meet the same standards as that of built-in louvered insulating glass.
Data comparison conclusion between the two tables:
The use of integrated shading louvered insulating glass energy-saving doors and windows is not only aesthetically pleasing, practical, and easy to install, but also has a service life of over 25 years. In terms of the overall cost of shading doors and windows for the entire project, compared to the use of manually operated outdoor shading roller blinds (which have higher costs for electrically controlled models), taking a single opening as an example, the total cost can be saved by at least 15%!
Comparison of construction cost between integrated energy-saving doors and windows with built-in sunshade blinds and outdoor sunshade fabric soft roller shutters
Note: Since the external shading fabric soft roller shutter does not contribute to the heat transfer coefficient of the entire window after being retracted, once it is applied, it is necessary to increase the cost of the building's external envelope structure, such as window-to-wall ratio, internal and external insulation structures, and other measures, in order to meet the energy efficiency acceptance standards. This greatly increases the construction costs for developers!
Data comparison conclusion between the two tables:
The use of shading integrated louvered insulating glass energy-saving doors and windows is not only aesthetically pleasing, practical, and easy to install, but also has a service life of over 25 years. In terms of the overall cost of shading doors and windows for the entire project, compared to the use of outdoor shading integrated fabric soft roller shades (which are more expensive for electric control), taking a single opening as an example, the total cost can be saved by at least 30%!
Comparison of the advantages and disadvantages of built-in sunshade shutter hollow shutters and outdoor sunshade roller shades
Built-in sunshade louver insulating glass Technical features:
1. It features sunshade and thermal insulation in summer, heating and insulation in winter, natural ventilation, wind resistance and noise reduction, as well as convenient and safe maintenance and repair, while ensuring natural lighting and visibility through the sunshade.
2. It features high integration of door and window shading, is not limited by the size of the opening, is anti-aging, fireproof, self-cleaning and anti-pollution, and does not affect the aesthetics of the building
Integrated energy-saving doors and windows with built-in shading blinds and insulating glass, as well as transparent glass curtain walls, combine sound, light, and heat control functions, making them the top choice for thermal insulation doors and windows! They can perfectly achieve the comprehensive effects of heating and insulation in winter, shading and insulation in summer, regulating light, and isolating noise; they are especially suitable for coastal cities with frequent typhoon weather, hot summers and cold winters, and hot summer and warm winter regions.
The insulating glass products of built-in sun shade louver shall meet the following relevant standards
Aluminum Alloy Doors and Windows GB/T8478-2020
Interpretation of the national standard of built-in sunshade insulating glass
Insulated glass products for built-in sunshade JG/T255-2020
Interpretation of the national standard of built-in sunshade insulating glass
The following conclusions can be drawn：
· Door and window insulation and door and window insulation are two important components of building energy conservation;
· The thermal insulation of doors and windows is expressed in terms of heat transfer coefficient K (U value in EU and America);
· The thermal insulation of doors and windows is expressed in terms of the SHGC value of the sun (used in the United States and China), the total solar transmittance g value (used in the EU, ISO standards, and domestic ISO standards), or the shading coefficient SC value (currently being replaced). The SHGC value in China will completely replace the SC value;
·The SHGC values in summer and winter are required respectively, which is an important trend of building energy conservation in China in the future;
In this context, the form and application of movable building shading is imperative!