From measured thermal conductivity and modeling by simulation, this study suggests that U-factors are highly related to materials used between steel and polymer. The objective and prospective point of this study are to relate the relationship between the U-factor and the thermal conductivity of the materials used. For the characterization, EDX, SEM, a thermal conductive meter, and computer simulation utility are used to analyze the elemental, surface structural properties, and U-factor with a simulation of the used material between steel and polymer. This study set out to divide the curtain wall system that makes up the envelope into an aluminum frame section and entrance frame section and interpret their thermal performance with U-factors. Based on the U-factor thermal analysis results, the target curtain wall system is divided into fix and vent types. The glass is 24 mm double glazing (6 mm common glass +12 mm Argon +6 mm Low E). The same U-factor of 1.45 W/m2·K is applied. The interpretation results show that the U-factor and total U-value of the aluminum frame section are 1.449 and 2.343 W/m2·K, respectively. Meanwhile, those of the entrance frame section are 1.449 and 2.

Abstract
1. Introduction
2. Experimental and Methodology
    2.1. Materials
    2.2. Method for geometry data
    2.3. Methodology and Simulation
    2.4 Boundary Conditions
3. Results and Discussion
    3.1. Materials analysis
    3.2. Thermal Conductivity and Properties of CurtainWall Frame Materials
    3.3. Modeling and Results of Curtain Wall StructuralParts
4. Conclusions
References

• Tongso Park(Department of Infra-system, Hanseo University) Corresponding author