49
Double glazing glass that is indispensable for the realization of the zero-energy
housing is PairGlass, which consists of several sheets of glasses stacked together.
Low-E double glazing glass with thin film coating of silver on the hollow layer side
of the glass has been attracting attention for building use. AGC Asahi Glass provides
multiple line-up of Low-E double glazing. In the area west of the Kanto region,
solar radiation shielding type glass that raises the heat shielding effect by stacking
multiple layers of silver is said to be popular. On the other hand, in the Tohoku and
Hokkaido regions, the solar radiation acquisition type glass that takes in solar radiation moderately by using only a single layer of silver is said to be popular. In both
cases, the values are the same level with regard to the heat transmittance rate for
evaluating heat transferability, and there is no difference in the insulation effect.
In Japan that has a small land area and where houses are compact, windows are
required to be about 100 mm thick in many cases. To realize adequate heat insulation even with this thinness, it is important to partition the hollow layer of the
PairGlass into multiple layers to suppress air convection in the hollow layer. The
triple glass shown in Fig. 3.10 uses three glasses and enhances heat insulation by
enclosing argon gas or krypton gas in the hollow layer. Also, since the window consists of glass and frame (sash), the performance of the frame must also be improved.
In future zero-energy housing, it is thought that windows that combine triple glass
with thin high insulation resin sash and resin composite sash will be adopted.
Insulation properties of buildings have not only a significant impact on energy
issues, but also on the health of their occupants. The Ministry of Land, Infrastructure,
Transport, and Tourism conducted surveys in cooperation with the Ministry of
Health, Labor, and Welfare and medical institutions on the death rate for each seaLow-E film
Indoor side
Outdoor side
Hollow layer
(argon gas-filled)
Spacer
Desiccant
Sealant
Fig. 3.10 Structure of triple glass. (Courtesy: AGC Asahi Glass)
3.3 Low Carbon Technologies in the Home and Business Sectors
Double glazing glass that is indispensable for the realization of the zero-energy
housing is PairGlass, which consists of several sheets of glasses stacked together.
Low-E double glazing glass with thin film coating of silver on the hollow layer side
of the glass has been attracting attention for building use. AGC Asahi Glass provides
multiple line-up of Low-E double glazing. In the area west of the Kanto region,
solar radiation shielding type glass that raises the heat shielding effect by stacking
multiple layers of silver is said to be popular. On the other hand, in the Tohoku and
Hokkaido regions, the solar radiation acquisition type glass that takes in solar radiation moderately by using only a single layer of silver is said to be popular. In both
cases, the values are the same level with regard to the heat transmittance rate for
evaluating heat transferability, and there is no difference in the insulation effect.
In Japan that has a small land area and where houses are compact, windows are
required to be about 100 mm thick in many cases. To realize adequate heat insulation even with this thinness, it is important to partition the hollow layer of the
PairGlass into multiple layers to suppress air convection in the hollow layer. The
triple glass shown in Fig. 3.10 uses three glasses and enhances heat insulation by
enclosing argon gas or krypton gas in the hollow layer. Also, since the window consists of glass and frame (sash), the performance of the frame must also be improved.
In future zero-energy housing, it is thought that windows that combine triple glass
with thin high insulation resin sash and resin composite sash will be adopted.
Insulation properties of buildings have not only a significant impact on energy
issues, but also on the health of their occupants. The Ministry of Land, Infrastructure,
Transport, and Tourism conducted surveys in cooperation with the Ministry of
Health, Labor, and Welfare and medical institutions on the death rate for each seaLow-E film
Indoor side
Outdoor side
Hollow layer
(argon gas-filled)
Spacer
Desiccant
Sealant
Fig. 3.10 Structure of triple glass. (Courtesy: AGC Asahi Glass)
3.3 Low Carbon Technologies in the Home and Business Sectors