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In Situ Thermal Transmittance Measurements for Investigating Differences between Wall Models and Actual Building Performance

Author

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  • Luca Evangelisti

    (Department of Engineering, University of Roma TRE, via Vito Volterra 62, Rome 00146, Italy)

  • Claudia Guattari

    (Department of Engineering, University of Roma TRE, via Vito Volterra 62, Rome 00146, Italy)

  • Paola Gori

    (Department of Engineering, University of Roma TRE, via Vito Volterra 62, Rome 00146, Italy)

  • Roberto De Lieto Vollaro

    (Department of Engineering, University of Roma TRE, via Vito Volterra 62, Rome 00146, Italy)

Abstract

An accurate assessment of a building’s wall performance, defined through the thermal transmittance, is essential to compute the annual energy consumption. Analyzing opaque surfaces, the heat transfer across walls can be modeled by an electro-thermal analogy, based on resistors series, crossed by a one-dimensional heat flow. This analogy is well established and it refers to stratigraphy composed of homogeneous materials. When dealing with inhomogeneous materials, possibly including hollow bricks, the wall’s thermal transmittance is evaluated by means of an effective conductance. However, in order to verify the theoretical models effectiveness, a comparison with in situ measurements is needed. In this paper, three building walls characterized by different stratigraphy have been analyzed; by employing a heat flow meter investigation. Measurements results and estimated thermal transmittance values—calculated applying the standard UNI EN ISO 6946—have been compared.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jsusta:v:7:y:2015:i:8:p:10388-10398:d:53707
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    References listed on IDEAS

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    2. 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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    5. David Bienvenido-Huertas & Roberto Rodríguez-Álvaro & Juan José Moyano & Fernando Rico & David Marín, 2018. "Determining the U -Value of Façades Using the Thermometric Method: Potentials and Limitations," Energies, MDPI, vol. 11(2), pages 1-17, February.
    6. Fabio Nardecchia & Benedetta Mattoni & Francesca Pagliaro & Lucia Cellucci & Fabio Bisegna & Franco Gugliermetti, 2016. "Computational Fluid Dynamic Modelling of Thermal Periodic Stabilized Regime in Passive Buildings," Sustainability, MDPI, vol. 8(11), pages 1-18, November.
    7. 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.
    8. Luca Caruso & Vincent M. Buhagiar & Simon P. Borg, 2023. "The Double C Block Project: Thermal Performance of an Innovative Concrete Masonry Unit with Embedded Insulation," Sustainability, MDPI, vol. 15(6), pages 1-19, March.
    9. Kyriakidis, Andreas & Michael, Aimilios & Illampas, Rogiros & Charmpis, Dimos C. & Ioannou, Ioannis, 2018. "Thermal performance and embodied energy of standard and retrofitted wall systems encountered in Southern Europe," Energy, Elsevier, vol. 161(C), pages 1016-1027.
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