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08-29-2011, 05:54 AM

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151484 2008 年 07 月 06 日 20:22 Reading (loading. ..) Comments (0) Category: Glass Knowledge
a overview of energy consumption
China is big country,air force 1 high, in China's energy consumption of unit building area is 2-3 times higher than in developed countries, face the grim fact that the development of energy efficient building without delay. Ministry of Construction: 2010, new construction for 1 / 3 or more to achieve energy efficient building standards. Meanwhile, the national total energy consumption of urban buildings to achieve target of 50% energy saving. Low-E glass and heat-reflective coated glass is the main energy saving building materials, the following performance comparison between these two types of glass.
II, and glass components in the form of heat the heat transfer
natural environment is the biggest thermal solar radiation, in which the energy of visible light, only about 1 / 3 of the remaining 2 / 3 of the thermal radiation is mainly . Another form of natural far infrared thermal heat radiation, the energy distribution in the 4 ~ 50μm wavelengths. In the outdoors, this part of the heat radiation from the sun to the object after the radiation absorbed by an object out of the summer to become the main heat source from one of the outdoor. Indoors, this part of the energy is heating, household appliances, furniture and sunlight the body produces, and winter as the main heat source from the interior.
solar radiation projected onto the glass, part of the absorbed or reflected by glass, the other through the glass to become directly through the energy. Absorb solar energy to the glass temperature, and air through convection and radiation transfer heat out, so there is still a considerable part of the final through the objects, which can be attributed to conduction, radiation, convection in the form of delivery.
of heating far infrared heat radiation emitted, the glass can not be directly through, it can only be reflected or absorbed, and ultimately only conduction, radiation, convection in the form of through the glass, so far infrared heat radiation through the glass heat transfer by conduction, radiation and air convection embodied.
the strength of the glass absorption is directly related to the glass on the far-infrared heat blocking effect. Low rate of absorption of radiation outside the glass is not easy thermal radiation energy, thus the glass by conduction, radiation and convection heat transfer to the small, low-E glass is limited in this part of the heat transfer.
these two forms of heat transfer through the glass can be summed up in two ways: directly through the solar radiation heat transfer, convection heat conduction.
pass through the glass per square meter of total thermal power Q can be expressed as:
Q = 630Sc + U (T in-T outside)
where 630 is the solar energy through the strength of 3mm clear glass ,nike air force one, (T in-T outside) is the glass on both sides of the air temperature are the parameters related to the environment.
Sc and U is the intrinsic parameters of the glass itself, its meaning is as follows:
Sc --- glass shading coefficient, values range from 0 to 1, which reflects the glass on the effect of direct solar radiation shield.
U --- glass, heat transfer coefficient, which reflects the ability of the heat conductivity of glass.
Thus,air force one low, the merits of energy saving glass, U and Sc by the two parameters can be determined completely.
three different heat transfer characteristics of glass and parameters
1, ordinary transparent glass
transparent glass (soda lime silicate glass) of the transmission range of spectral regions of solar radiation just coincidence, therefore, through the visible light At the same time, the sun's infrared heat is also heavily through the glass, while the 3 ~ 5μm in the thermal infrared has been a lot to absorb, which causes it can not effectively Pi archery Pik Choi small boat? BR> on heating above 5μm wavelength emitted thermal radiation, ordinary glass,air force one low nike, but not directly through the almost completely absorbed, and through conduction, radiation and air convection heat transfer manner to the outdoors.
2, heat-reflective coating heat-reflective glass coating glass ---
the surface of glass or metal compounds, metal-coated film, so that was rich in color and the glass was a new light, heat performance. Its main function is to reduce the shading coefficient of glass Sc,nike air force one low, limit the direct solar radiation through. Far-infrared heat-reflective coating on the reflection effect is not obvious, it is to improve the U value is not much change.
light intensity in the summer the area, the role of heat-reflective glass is clear of insulation, can be effective attenuation of solar radiation into the interior. But in the absence of the sun's environment,nike air force 1 high, such as at night or rainy weather, the role of its insulation and white glass is no different. From the energy point of view it does not apply to cold regions, because these areas need sunlight into the interior heating. Northern cold regions with the sole purpose of this glass is the pursuit of decorative effect.
3, Low-E Glass (Low-E coated glass)
Low-E glass low-E coated glass --- silver and metal oxide film material, the glass takes on different colors. Its main role is to reduce the U value of glass, while selectively reducing Sc, an overall improvement in energy-saving characteristics of the glass.
high permeability-type Low-E glass, the shading coefficient Sc ≥ 0.5, less attenuation of solar energy through. This northern region dominated by the heating is very applicable to winter bands of solar radiation through this Low-E glass into the room, the room becomes the object absorbed through the Low-E glass can not be far-infrared heat radiation, and and indoor heating thermal radiation emitted is limited to the common room, thus saving heating costs.
shade-type Low-E glass, the shading coefficient Sc <0.5, attenuation of solar energy through more. This southern region of the air cooling is very applicable to limit the maximum solar energy in summer into the room, and block from outside the far-infrared heat radiation, thus saving on air conditioning costs.
Low-E glass, the different varieties for different climatic regions to energy saving, its function has been covering the heat-reflective coating glass.
IV Conclusion
briefly summarized above, two main thermal properties of glass distinction. Currently, under the guidance of national industrial policy, the constraints of national energy legislation, Low-E glass has a very wide range of applications, Low-E glass can hope to go further, I hope the national scientific research departments and the manufacturers can develop a higher side of the glass energy-saving products, energy conservation in the country make a significant contribution.

08-29-2011, 05:54 AM	#2
t1ei2dw8ve Posts: n/a	\| Back to logs list 151484 2008 年 07 月 06 日 20:22 Reading (loading. ..) Comments (0) Category: Glass Knowledge a overview of energy consumption China is big country,air force 1 high, in China's energy consumption of unit building area is 2-3 times higher than in developed countries, face the grim fact that the development of energy efficient building without delay. Ministry of Construction: 2010, new construction for 1 / 3 or more to achieve energy efficient building standards. Meanwhile, the national total energy consumption of urban buildings to achieve target of 50% energy saving. Low-E glass and heat-reflective coated glass is the main energy saving building materials, the following performance comparison between these two types of glass. II, and glass components in the form of heat the heat transfer natural environment is the biggest thermal solar radiation, in which the energy of visible light, only about 1 / 3 of the remaining 2 / 3 of the thermal radiation is mainly . Another form of natural far infrared thermal heat radiation, the energy distribution in the 4 ~ 50μm wavelengths. In the outdoors, this part of the heat radiation from the sun to the object after the radiation absorbed by an object out of the summer to become the main heat source from one of the outdoor. Indoors, this part of the energy is heating, household appliances, furniture and sunlight the body produces, and winter as the main heat source from the interior. solar radiation projected onto the glass, part of the absorbed or reflected by glass, the other through the glass to become directly through the energy. Absorb solar energy to the glass temperature, and air through convection and radiation transfer heat out, so there is still a considerable part of the final through the objects, which can be attributed to conduction, radiation, convection in the form of delivery. of heating far infrared heat radiation emitted, the glass can not be directly through, it can only be reflected or absorbed, and ultimately only conduction, radiation, convection in the form of through the glass, so far infrared heat radiation through the glass heat transfer by conduction, radiation and air convection embodied. the strength of the glass absorption is directly related to the glass on the far-infrared heat blocking effect. Low rate of absorption of radiation outside the glass is not easy thermal radiation energy, thus the glass by conduction, radiation and convection heat transfer to the small, low-E glass is limited in this part of the heat transfer. these two forms of heat transfer through the glass can be summed up in two ways: directly through the solar radiation heat transfer, convection heat conduction. pass through the glass per square meter of total thermal power Q can be expressed as: Q = 630Sc + U (T in-T outside) where 630 is the solar energy through the strength of 3mm clear glass ,nike air force one, (T in-T outside) is the glass on both sides of the air temperature are the parameters related to the environment. Sc and U is the intrinsic parameters of the glass itself, its meaning is as follows: Sc --- glass shading coefficient, values range from 0 to 1, which reflects the glass on the effect of direct solar radiation shield. U --- glass, heat transfer coefficient, which reflects the ability of the heat conductivity of glass. Thus,air force one low, the merits of energy saving glass, U and Sc by the two parameters can be determined completely. three different heat transfer characteristics of glass and parameters 1, ordinary transparent glass transparent glass (soda lime silicate glass) of the transmission range of spectral regions of solar radiation just coincidence, therefore, through the visible light At the same time, the sun's infrared heat is also heavily through the glass, while the 3 ~ 5μm in the thermal infrared has been a lot to absorb, which causes it can not effectively Pi archery Pik Choi small boat? BR> on heating above 5μm wavelength emitted thermal radiation, ordinary glass,air force one low nike, but not directly through the almost completely absorbed, and through conduction, radiation and air convection heat transfer manner to the outdoors. 2, heat-reflective coating heat-reflective glass coating glass --- the surface of glass or metal compounds, metal-coated film, so that was rich in color and the glass was a new light, heat performance. Its main function is to reduce the shading coefficient of glass Sc,nike air force one low, limit the direct solar radiation through. Far-infrared heat-reflective coating on the reflection effect is not obvious, it is to improve the U value is not much change. light intensity in the summer the area, the role of heat-reflective glass is clear of insulation, can be effective attenuation of solar radiation into the interior. But in the absence of the sun's environment,nike air force 1 high, such as at night or rainy weather, the role of its insulation and white glass is no different. From the energy point of view it does not apply to cold regions, because these areas need sunlight into the interior heating. Northern cold regions with the sole purpose of this glass is the pursuit of decorative effect. 3, Low-E Glass (Low-E coated glass) Low-E glass low-E coated glass --- silver and metal oxide film material, the glass takes on different colors. Its main role is to reduce the U value of glass, while selectively reducing Sc, an overall improvement in energy-saving characteristics of the glass. high permeability-type Low-E glass, the shading coefficient Sc ≥ 0.5, less attenuation of solar energy through. This northern region dominated by the heating is very applicable to winter bands of solar radiation through this Low-E glass into the room, the room becomes the object absorbed through the Low-E glass can not be far-infrared heat radiation, and and indoor heating thermal radiation emitted is limited to the common room, thus saving heating costs. shade-type Low-E glass, the shading coefficient Sc <0.5, attenuation of solar energy through more. This southern region of the air cooling is very applicable to limit the maximum solar energy in summer into the room, and block from outside the far-infrared heat radiation, thus saving on air conditioning costs. Low-E glass, the different varieties for different climatic regions to energy saving, its function has been covering the heat-reflective coating glass. IV Conclusion briefly summarized above, two main thermal properties of glass distinction. Currently, under the guidance of national industrial policy, the constraints of national energy legislation, Low-E glass has a very wide range of applications, Low-E glass can hope to go further, I hope the national scientific research departments and the manufacturers can develop a higher side of the glass energy-saving products, energy conservation in the country make a significant contribution.

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