Is the energy-saving retrofit a glass change or a thermal insulation film?

Is the energy-saving retrofit a glass change or a thermal insulation film?

[China Glass Network] Building energy conservation includes building energy conservation (including renovation and expansion) and energy-saving renovation of existing buildings. China has a building area of ​​40 billion square meters, most of which are not energy efficient.

The public building area of ​​the country is about 4.5 billion square meters, of which public buildings (shops, office buildings, hotels) with central air-conditioning are 500-600 million square meters, and the energy consumption per unit area of ​​public buildings accounting for 11% of the existing building area is about It is about 10 times that of an ordinary residential building, and it is called a large energy consumer.

Some public buildings have more than 20% of the building area, and the energy consumption through doors and windows accounts for about 50% of the entire building. The energy loss through the glass accounts for about 75% of the energy consumption of the door and window, and the energy consumption of the glass accounts for about 80% of the window area.

The focus of building energy-saving renovation is public buildings. The renovation of doors, windows and curtain walls is the key to building energy efficiency, and the glass transformation is the top priority of energy-saving work.

There are only two options for the energy-saving renovation of glass in existing buildings: one is to replace the original glass with energy-saving glass, and the other is to attach the original glass to the thermal insulation film for construction.

Types and functions of energy-saving glass

1. Coated glass: Coated glass is one or more layers of metal, alloy or metal compound on the surface of the glass to change the properties of the glass. According to different characteristics, it can be divided into heat reflective glass and low radiation glass.

Heat-reflecting (sunlight control) glass, generally coated with one or more layers of metal such as chromium, titanium or stainless steel or a compound thereof on the surface of the glass, so that the product is rich in color and has appropriate transmittance for visible light. Infrared has a high reflectivity and a low transmittance to ultraviolet light, so it is also called a solar control glass. Compared with ordinary glass, the shading coefficient is lowered, that is, the shading performance is improved, but the heat transfer coefficient is not changed much.

Low-emission (LOW-E) glass is a film consisting of a plurality of layers of silver, copper or tin or other compounds on the surface of the glass. The product has a high transmittance for visible light and a high reflectance for infrared rays. Good thermal insulation properties, due to the poor strength of the film, are generally made of insulating glass and not used alone.

2. Insulating glass: Insulating glass is composed of two or more glass frames made of aluminum hollow frame, sealed by cement or welding, forming a free space in the middle, which can be filled with dry air or inert gas, and its heat transfer coefficient U ratio The single-layer glass is small, and the heat preservation performance is good, but the shading coefficient SC is reduced little, and the heat reflection resistance to solar radiation is not improved much.

3. Composite of coated glass and hollow glass: including heat-reflecting coated hollow glass and low-emission coated insulating glass. The former can reduce the heat transfer coefficient and the shading coefficient at the same time, and the latter has a good light transmittance. Types and Functions of Architectural Glass Films Architectural glass films are made by bonding high-quality polyester (PET) film and metal coating layer by vacuum magnetic spray coating process, which provides excellent solar control for various types of glass. Architectural glass films are broadly divided into three categories:

1. Building Insulation Glass Film Building Insulation film is mainly used for energy saving. It is equipped with UV-blocking and safety explosion-proof functions. This building insulation film is divided into heat-reflecting film and low-radiation film.

The heat reflective film (also known as the solar control film) is attached to the surface of the glass to allow a certain amount of visible light to pass through the room. The high infrared reflectance IR and the low solar heat gain coefficient SHGC can keep the indoor temperature from rising in the hot summer. Too much, thus reducing the cost of electricity for indoor air conditioning.

Low-emission film (also known as LOW-E film) can transmit a certain amount of short-wave solar radiant energy, so that solar radiant heat (near-infrared) enters the room, and at the same time can more than 90% of indoor object heat sources (such as heating equipment) The radiated long-wave infrared (far infrared) is reflected back into the room. The LOW-E film can make full use of the outdoor solar short-wave radiation and the long-wave radiation energy of the indoor heat source. Therefore, it can be used as a heat preservation and energy-saving effect in heating buildings in cold regions.

2, the main function of building safety glass film is safety explosion-proof, anti-theft and bulletproof. The film has good impact resistance (anti-explosive strength), stab strength, and UV blocking ability, high transparency or full transparency.

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