Journal of the Architectural Institute of Korea (대한건축학회논문집)

Architectural Institute of Korea (대한건축학회)
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Analyzing the Influences of Indoor-Outdoor Air Temperature Differences on the Convergence Characteristic and Accuracy of In-situ Thermal Resistance Estimation of Building Exterior Walls Using Heat Flow Meter Method

열류계법을 이용한 건물 외벽체 열저항 추정의 수렴성 및 정확성에 대한 실내·외 온도차의 영향 분석

  • Ko, Myeong-Jin (Dept. of Building System Technology, Daelim University College) ;
  • Lee, Ye-Ji (Dept. of Architectural Design and Engineering, Incheon National University) ;
  • Choi, Doo-Sung (Dept. of Building Equipment System and Fire Protection Engineering, Chungwoon University)
  • 고명진 (대림대학교 소방안전설비과) ;
  • 이예지 (인천대학교 일반대학원 건축학과) ;
  • 최두성 (청운대학교 설비소방학과)
  • Received : 2024.05.03
  • Accepted : 2024.06.12
  • Published : 2024.07.30
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Abstract

The heat flow meter method and average method have been widely used to measure and analyze the thermal resistance of building exterior walls because of their popularity and convenience. However, low accuracy and long measurement period are obvious limitations of these methods, and many studies have been conducted to address them. These studies reported that the temperature difference between indoor and outdoor environment is the most important factor affecting the accuracy and convergence characteristics of in situ thermal resistance estimation. However, these studies analyzed only a small number of cases with specific temperature differences, so the influence of various temperature differences that can occur in practice were not investigated. This study aimed to analyze the influence of the average temperature difference on the convergence characteristics and accuracy of in situ thermal resistance estimation using the average method. Data measured by the heat flow meter method from October 2022 to May 2023 on the north-facing wall of a full-scale experimental building were used. The findings show that the percentage of convergence satisfaction increases as the temperature difference increases, but each condition differs significantly from the other in ease of satisfaction. For temperature differences above about 12℃, the difference in accuracy due to the fulfillment of convergence conditions was larger than the difference in accuracy due to the increase in temperature difference.

Keywords

Acknowledgement

이 연구는 2024년도 한국연구재단 연구비 지원에 의한 결과의 일부임. 과제번호 : No. RS-2023-00253166

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