Estimating In-Situ R-Value of Highly Insulated Building Walls Based on the Measurement of Temperature and Heat Flux Inside the Wall

Doo-Sung Choi, Ye-Ji Lee, Ji-Hoon Moon, Yong-Shik Kim and Myeong-Jin Ko ()
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Doo-Sung Choi: Department of Building Equipment System and Fire Protection Engineering, Chungwoon University, Incheon 22100, Republic of Korea
Ye-Ji Lee: Department of Architectural Design and Engineering, Incheon National University, Incheon 22012, Republic of Korea
Ji-Hoon Moon: Department of Architectural Design and Engineering, Incheon National University, Incheon 22012, Republic of Korea
Yong-Shik Kim: Division of Architecture and Urban Design, Incheon National University, Incheon 22012, Republic of Korea
Myeong-Jin Ko: Department of Building System Technology, Daelim University College, Anyang 13916, Republic of Korea

Energies, 2023, vol. 16, issue 15, 1-16

Abstract: Accurate and rapid in situ measurements of the thermal resistance (R-value) of building envelopes are necessary for assessing planned performance and identifying appropriate retrofitting strategies. Although there are several approaches for in situ R-value estimation, the average method of ISO 9869-1 based on the heat flow meter method is the most widely used. However, discrepancies between theoretical and in situ R-values are frequently reported in many studies that employ this method. This study aimed to investigate the cause of this discrepancy in estimating in situ R-values of highly insulated building walls using the average method of ISO 9869-1 by conducting long-term experiments. This study was made possible due to a specially constructed test wall wherein more sensors were installed than are required by the ISO 9869-1 standard. The findings showed that discrepancies between heat fluxes on the internal surface and heat passing through the wall is the main cause of the error in in situ R-value estimation. Measurement results from winter showed that deviation from the theoretical R-value was 9.12% for the average method and 0.6% for the extended average method, determined by additionally using the temperature and heat flux inside the wall.

Keywords: thermal resistance; in situ measurement; heat flow meter method; average method; highly insulated building wall (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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