Insulating energy-efficient glass: the
In the passive building that pursues "zero energy consumption" and "near-zero energy consumption", there is no need to rely on active heating or cooling equipment, and indoor thermal comfort is achieved only through the building's own design and material performance
1. Extreme heat insulation, an "invisible line of defense" that blocks heat conduction
The core requirement of passive buildings is to reduce indoor and outdoor heat exchange, and the hollow energy-saving glass has built an efficient thermal insulation system through the design of "multi-layer structure + inert gas filling".
·Double-storey/triple-storey hollow structure: reserved between glasses The 12-20mm air layer (or filled with argon, krypton and other inert gases) uses the low thermal conductivity of the gas to block heat convection, and its heat transfer coefficient (U value) can be as low as 0.8-1.2 W/(㎡・K), which is only 1/5 of ordinary single-layer glass (the U value of ordinary glass is about 5.0 W/(㎡・K)).
·Low-E coating technology: a special metal coating layer is coated on the glass surface, which can reflect more than 80% of infrared rays (the main carrier of heat) and block the introduction of high outdoor temperatures in summer. Indoor heating is retained in winter, so that the indoor temperature fluctuation is controlled within ±2°C, and the dependence on air conditioning and heating is greatly reduced.
Taking passive houses in North China as an example, after using three-glass and two-cavity insulating energy-saving glass, the room temperature can be maintained above 18°C in winter only through solar radiation heat and indoor living waste heat, reducing heating energy consumption by more than 90% compared with traditional buildings.
2. High light transmittance and heat retention, a "natural converter" to capture clean energy
Passive buildings rely on "passive solar energy utilization" for free energy, and insulating energy-efficient glass achieves this by optimizing optical performance:
·High visible light transmittance: the light transmittance can reach more than 75%, allowing sufficient sunlight to enter the room and convert it into heat energy storage (such as through the ground and wall heat storage materials). Provides a natural heat source for winter heating.
·Selective spectral filtration: Coating technology filters out ultraviolet rays (to prevent furniture aging) and excessive infrared rays (to prevent overheating in summer) to maximize the use of solar energy while avoiding overheating indoors.
In Nordic passive buildings, the south-facing façade uses insulating energy-saving glass in a large area, which can capture 60% of the building's heating needs in winter, becoming one of the core energy sources.
3. Block the "key node" of cold and hot bridges to ensure the air tightness of the building
Passive buildings have strict requirements for "air tightness" (the number of air changes ≤ 0.6 times / hour), and doors and windows are the weak link of air tightness
·Synergy with the sealing system: with multi-channel sealing strips and warm edge spacers (using low thermal conductivity materials such as stainless steel and composite materials) to avoid the "cold and hot bridge" caused by the temperature difference on the glass edge. Prevents heat loss and condensation.
·Anti-condensation performance: Due to the excellent thermal insulation, the temperature of the inner surface of the glass is close to room temperature, even in the outdoor environment of -10°C, it can avoid condensation and icing, and ensure light transmittance at the same time. Reduce the problem of moisture on the wall caused by condensation.
In the German Passivhaus standard building, the combination of insulating energy-saving glass and high-performance door and window system can reduce the heat loss of doors and windows to 1/4 of that of traditional doors and windows, which has become an indispensable part of the overall energy-saving standard of the building.
Summary: The "energy-saving cornerstone" of passive buildings
Insulating energy-saving glass passesThe triple role of "heat insulation, light transmission, and air tightness" directly contributes to the energy saving effect of passive buildings by more than 50%, and is the core material to achieve "low energy consumption and high comfort". Its performance directly determines whether the passive building can meet the energy efficiency standard, so it is called "the eyes and skin of the passive building" in the industry - it not only protects the stability of the indoor thermal environment, but also allows the building to interact with natural energy efficiently. For Hebei Yizhai Glass, its high-performance insulating energy-saving glass (such as three-glass two-cavity Low-E argon glass) has been recognized by industry associations and passive building users, and has become the preferred material for many passive building projects. It provides solid support for the low-carbon transformation of green buildings.
