플라스틱 단열재를 적용한 커튼월 파스너의 단열성능 평가

Abstract

Curtain wall system is widely used for many high-rise buildings. This system has a lot of advantages in economic feasibility and high-quality construction. It can be installed with much less construction processes while maintaining the construction quality of the building, compared with conventional envelope systems. In addition, it is mostly made of metal and glasses, making its appearance look so modern and cool that people can be provided with visual amenity. On the other hands, this system is usually made up with metal frame such as aluminum or steel because it should have enough structural strength. In addition structural parts such as fastener, bolt and nut, which are used to incorporate the curtain wall into building structures, are also usually metallic. The weak point is that those metallic materials have such a high thermal conductivity that they can cause much heat loss through the building envelope. With this system, the building could lead to increased heating and cooling load. increasing the energy consumption to keep comfortable indoor condition by AHU(Air Handling Unit). To reduce the energy consumption in buildings, energy requirement should be firstly reduced by improving the insulation of building envelope. Wall insulation is a very important factor because room air temperature usually depends on the heat transmittance through the wall. If the heat transmittance through the wall could be reduced, indoor environment is more easy to be controlled by AHU, compared to the wall with lower insulation. To improve Insulation, it is necessary to use the materials with low thermal conductivity. However these materials mostly cannot perform as structural parts because of relatively low structural strength. If plastic material with lower thermal conductivity is used for the entire curtain wall, the building will be unsafe so that structural part have to be original positioned and thermal breaker like plastic have to be positioned at the weakest point. In this research, teflon is suggested to improve thermal performance of curtain wall. Teflon is a kind of engineering plastic which has lower thermal conductivity and reasonable hardness so that it can be a suitable material for curtain wall element. To show the effect of suggested alternatives on insulation improvement, CFD simulation was conducted in parallel with mock-up experiments. Both of CFD simulation and experiment showed the consistent results, indicating that the teflon is effective to improve the thermal insulation performance of the curtain wall.