Building energy consumption of the hottest silicon

2022-08-19
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Building energy consumption of silicone structural adhesive glass assembly

with people's preference for large glass inlays, the technology that can improve the efficiency of glass assembly system is also becoming increasingly important. People have developed various special coatings that can maximize the transmission of light, which realizes the minimum lighting cost, and can also block unwanted heat outside the building in the hot season. The coating developed for cold seasons can absorb solar heat energy and keep buildings warm at night

however, for the frame system and attachment method, it is not only limited to the initial thermal efficiency, but also must have long-term efficiency. General frames are made of aluminum, which is one of the metals with the best thermal conductivity so far. At present, there are a variety of materials and technologies, such as adhesive strips, silicone adhesive strips, structural adhesive assembly, wet sealant, polyurethane heat blocking materials and polyamide heat blocking materials, which can be used for heat blocking of aluminum frames and isolating the indoor and outdoor environment

in this paper, high-performance and low-performance glass assembly and two commonly used attachment methods are evaluated in combination with different air permeability. At the same time, the temperature difference and energy consumption of the outer wall of commercial buildings are also compared

I. modeling and research of glass assembly

this paper combines modeling tools to evaluate the effects of different glass assembly systems under hot and cold weather conditions. The adhesion method of glass assembly has a certain impact on the overall heat transfer and energy consumption of the system

for simplicity, only one aluminum frame system is selected for the study. The basic framework is a series of impact tests. When carried out at low temperature, room temperature and high temperature, a series of impact values ak50 mm wide, 100 mm deep and 3 mm thick can be obtained. Make models of two different types of insulating glass by using therm program. The inner and outer sides of both models are 6mm thick glass, and the air layer spacing between the glasses is 14mm. The first system uses two pieces of 6mm thick transparent glass, while the second system has a transparent glass on the inner side and a transparent glass with triple low radiation coating on the second side

the simulation of two kinds of insulating glass spacer strips aims to show the effect of spacer strips with different heat transfer rates. One model uses aluminum spacer strips filled with desiccant, while the other model uses silicone foam strips containing desiccant. Both spacer strips are sealed with butyl rubber (PIB) as the leading seal and organic silicone as the second seal

two different glass assembly systems attached to the frame, two different insulating glass structures and two different insulating glass spacer systems are compared. The comparison is carried out in the following ways:

1. The standard method of mechanically fixing the insulating glass system, using ethylene propylene diene monomer (EPDM) to maintain thermal isolation between the external mechanical restraint material and the internal frame, is compared with the closed joint system formed by attaching the insulating glass with silicone structural adhesive and applying wet weather resistant sealant on the outside

2。 The triple low radiation coated high-performance insulating glass unit is compared with the standard insulating glass unit using only transparent glass

3。 The aluminum spacer is compared with the silicone foam spacer with warm edges

conclusion

the silicone structural adhesive assembly (SSG) system using high-performance glass and silicone foam spacer shows the smallest indoor and outdoor heat difference. This shows that the silicone structural adhesive assembly (SSG) system is superior to the dry adhesive strip sealing assembly system with improved thermal efficiency

II. Building modeling and research

when building modeling, a large South facing facade was set for the building, and two locations were selected in the Northern Hemisphere - Las Vegas, Nevada, and Minneapolis, Minnesota, which represent the hot desert climate and cold climate respectively

the building model can also use the climate data of major cities around the world. The above modeling systems, such as insulating glass (low radiation coating and transparent insulating glass), silicone structural adhesive assembly (SSG) system, and dry adhesive strip sealing assembly system with improved thermal efficiency, are all input into EFEN modeling program. The default air permeability of the program is 5. 5 m3/m2/h. The ratio used in this paper is 0 to 16. 5 m3/m2/h

energy consumption can be simply converted into carbon dioxide emissions. According to the existing data, it can be calculated that if 40% natural gas, 40% coal and 11% aluminum are optimistic about the use of nuclear energy in traffic lightweight, 6. If 6% renewable energy (such as wind energy) and about 2% other technologies are used to generate electricity, then every 1 kwh of electricity produced by the hybrid power generation method =0. 480 kg CO2 emissions. Using these calculation formulas (1 gigajoule of natural gas =53.8 kg of carbon dioxide and 1 kilowatt hour of electricity =0.480 kg of carbon dioxide) to convert the electricity and gas consumption of the building, we can calculate the annual carbon dioxide emissions of the 9-story high-rise building with various types of door and window systems

under hot weather conditions, the carbon dioxide emissions of buildings with the best performance door and window system (windows #1:ssg, lowe3 triple low radiation coated glass, 0 permeability) are 34 less than those with the worst door and window system (windows #9: dry rubber strip sealing, transparent glass, 16. 5 permeability). 9 tons. Similarly, in cold weather, buildings with the best door and window system have 92 less carbon dioxide emissions than those with the worst door and window system. 4 tons

conclusion

compared with the dry adhesive strip sealing assembly system with improved thermal efficiency, the silicone structural adhesive assembly (SSG) system can achieve the least heat transfer. This is mainly due to the fact that the facade does not contain any metal materials that can transmit heat or cold to the interior of the building. According to the procedure of nfrc100 to determine the U value of doors, windows and curtain walls, silicone structural adhesive assembly (SSG) system can be considered to have heat blocking function because of its thermal conductivity and the spacing between glass and aluminum. Compared with the dry adhesive strip sealing assembly system with improved thermal efficiency, the silicone structural adhesive assembly (SSG) system can provide a better framework system

The

therm model shows the advantages of the silicone foam insulating glass spacer with warm edges after drying compared with the aluminum spacer. This is because the heat transfer rate of the silicone foam after drying is greatly reduced by the development of the industry. Compared with the aluminum spacer, the dry silicone foam insulating glass spacer with warm edges can provide a better spacer system for the supply and demand of lithium salt in the domestic market

the window program using the therm model predicts that the system containing large pieces of glass will show the role of high-performance coated glass. Compared with the insulating glass made of transparent glass, the insulating glass unit containing high-performance low radiation coated glass can reduce the heat transfer through the facade of the outer wall

the comprehensive energy analysis of EFEN sends an important message to designers and engineers: all systems of the exterior wall must maintain integrity. The external wall is assembled with wet organic silicone structure. Because the organic silicone structural adhesive used as adhesive/sealant has a long service life, it can maintain long-term structural performance. It is understood that the service life of this technology is better than that of organic material technology

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