현장 열교 측정을 위한 시간지연의 오차영향 평가연구: 창호-벽체 접합부를 중심으로
Error Impacts of Time-Lag on In-situ Measurement of Thermal Bridge Performance : Case in the Window-Wall Junction
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Considering the values acquired from thermal bridge performance indicators developed basedon a design stage may differ from the actual thermal bridge performance values, it is essential toquantitatively assess their performance in-situ. When the surface temperature of the internalwalls of a thermal bridge is measured in-situ to evaluate the performance, a time delay isobserved in the transfer of the effect of external conditions to the internal surfaces. The shape ofthe thermal bridge components exhibit either 2D or 3D boundary conditions, and hence,multiple time lags can occur depending on the surface condition of the thermal bridge, whichaffects the accuracy of the performance of thermal bridges during evaluations in-situ. Therefore,in this study, we analyzed the effect of time lag of the thermal bridge components on the thermalbridge performance using heat transfer simulations. It was observed that the relative error wasapproximately 25.35% with an average of 9.22% as compared to the steady-state thermalbridge. Furthermore, the approximate time lag values of each component surface werecalculated based on their surface temperatures. As a result, the time lag difference between thethermal and non-thermal bridge components was approximately 10 h and 30 min, respectively. On eliminating the time lag difference from all surfaces of the thermal bridge components usingthe calculated time lag, the relative error decreased to 19.97% with an average of 7.69%, ascompared to the steady-state thermal bridge. Therefore, the relative error increased by 1.53%with an average of approximately 5.40%, owing to the time lag of the thermal bridge.
Abstract
Considering the values acquired from thermal bridge performance indicators developed basedon a design stage may differ from the actual thermal bridge performance values, it is essential toquantitatively assess their performance in-situ. When the surface temperature of the internalwalls of a thermal bridge is measured in-situ to evaluate the performance, a time delay isobserved in the transfer of the effect of external conditions to the internal surfaces. The shape ofthe thermal bridge components exhibit either 2D or 3D boundary conditions, and hence,multiple time lags can occur depending on the surface condition of the thermal bridge, whichaffects the accuracy of the performance of thermal bridges during evaluations in-situ. Therefore,in this study, we analyzed the effect of time lag of the thermal bridge components on the thermalbridge performance using heat transfer simulations. It was observed that the relative error wasapproximately 25.35% with an average of 9.22% as compared to the steady-state thermalbridge. Furthermore, the approximate time lag values of each component surface werecalculated based on their surface temperatures. As a result, the time lag difference between thethermal and non-thermal bridge components was approximately 10 h and 30 min, respectively. On eliminating the time lag difference from all surfaces of the thermal bridge components usingthe calculated time lag, the relative error decreased to 19.97% with an average of 7.69%, ascompared to the steady-state thermal bridge. Therefore, the relative error increased by 1.53%with an average of approximately 5.40%, owing to the time lag of the thermal bridge.
참고문헌 (18)
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