| Title |
Simulation of Surface Temperature Change by the Insulation Thickness of Hot Water Pipe in Building |
| Authors |
Seong Eun Kim ; Jin Chul Park ; Hyung-Kyou Ryu |
| DOI |
https://doi.org/10.6110/KJACR.2020.32.1.021 |
| Keywords |
온수배관; 배관 단열 두께; 표면온도; 시뮬레이션 Hot water pipe; Insulation thickness of pipe; Surface temperature; Simulation |
| Abstract |
The standards for energy-saving in buildings have been steadily strengthened because of the mandatory zero- energy buildings. But the insulation standards for heating and cooling water piping have been applied since 2002, without major changes. Thus, this study is a basic research step in proposing energy-saving insulation standards for building piping in preparation for mandatory zero energy, and the criteria for domestic and foreign piping insulation thickness were investigated. Surface temperature was compared when each thickness criterion was applied. As a result of the domestic and abroad standard comparison, the domestic standard (KCS) for insulation of piping stipulates the type and thickness of insulation material. However, the AHRAE standard is defined for thermal conductivity. The simulation analysis with piping insulation thickness according to each criterion showed that for low temperatures, the heat transmission coefficient was 0.9 W/㎡?K, ASHRAE 0.72 W/㎡?K, respectively, and the surface temperature was 6°C higher. For medium temperatures, the heat transmission coefficient of the KCS was 0.72 W/㎡?K, and ASHRAE was 0.488 W/㎡?K, respectively, and the surface temperature was 18°C higher for the KCS. Additionally, when applying the KCS standard, the heat loss per unit length was 1.1 times higher (KCS 4,525.6 W/m, ASHRAE 4,110.6 W/m) for low temperatures and 1.25 times higher (KCS 5,635.0 W/m, ASHRAE 4,519.4 W/m) for medium temperatures than in the case of applying the ASHRAE. The thermal performance of the insulating materials according to the ASHRAE standards is better than that of following the KCS. Thus, the domestic standard also needs to change the thickness of the insulation to the heat conductivity standard rather than the designation for the type of insulation. |