현장 열교 진단을 위한 시뮬레이션 기초연구

초록

In thermal bridge assessment, the linear thermal transmittance (Ψ-value) is commonly calculated under steady-state conditions. However, such steady-state analysis, typically derived from design-document–based simulations, is unsuitable for in-situ measurements because actual field environments are dynamic and variable. Before establishing an appropriate in-situ measurement methodology, this study serves as a preliminary investigation that uses dynamic-state simulations to replicate field conditions and analyze their impact on Ψ-value estimation. The simulations incorporated time-varying boundary conditions, and Ψ-values derived from dynamic heat flux data were compared with those obtained from steady-state analysis. Indoor–outdoor temperature difference, solar radiation, and wind speed were identified as key factors, and their effects were examined through trend and sensitivity analyses. Based on this analysis, optimal measurement conditions were proposed, reducing the average Ψ-value by approximately 6% compared to steady-state estimates, suppressing apparent outliers, and lowering the standard deviation by 41.1%, thereby improving data reliability. These results indicate that applying the proposed conditions in field measurements using a heat flux meter can lead to more quantitative and reliable estimates, and that dynamic simulation can be an effective preliminary step toward developing robust in-situ diagnostic methods for thermal bridges.

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