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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Doo-Sung Choi & Ye-Ji Lee & Ji-Hoon Moon & Yong-Shik Kim & Myeong-Jin Ko, 2023. "Estimating In-Situ R-Value of Highly Insulated Building Walls Based on the Measurement of Temperature and Heat Flux Inside the Wall," Energies, MDPI, vol. 16(15), pages 1-16, July.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:15:p:5714-:d:1207106
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    References listed on IDEAS

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    1. Doo Sung Choi & Myeong Jin Ko, 2019. "Analysis of Convergence Characteristics of Average Method Regulated by ISO 9869-1 for Evaluating In Situ Thermal Resistance and Thermal Transmittance of Opaque Exterior Walls," Energies, MDPI, vol. 12(10), pages 1-18, May.
    2. Bienvenido-Huertas, David & Moyano, Juan & Marín, David & Fresco-Contreras, Rafael, 2019. "Review of in situ methods for assessing the thermal transmittance of walls," Renewable and Sustainable Energy Reviews, Elsevier, vol. 102(C), pages 356-371.
    3. Luca Evangelisti & Claudia Guattari & Paola Gori & Roberto De Lieto Vollaro, 2015. "In Situ Thermal Transmittance Measurements for Investigating Differences between Wall Models and Actual Building Performance," Sustainability, MDPI, vol. 7(8), pages 1-11, August.
    4. Doo Sung Choi & Myeong Jin Ko, 2017. "Comparison of Various Analysis Methods Based on Heat Flowmeters and Infrared Thermography Measurements for the Evaluation of the In Situ Thermal Transmittance of Opaque Exterior Walls," Energies, MDPI, vol. 10(7), pages 1-22, July.
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