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Analytical Methods to Estimate the Thermal Transmittance of LSF Walls: Calculation Procedures Review and Accuracy Comparison

Author

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  • Paulo Santos

    (ISISE, Department of Civil Engineering, University of Coimbra, Pólo II, Rua Luís Reis Santos, 3030-788 Coimbra, Portugal)

  • Gabriela Lemes

    (ISISE, Department of Civil Engineering, University of Coimbra, Pólo II, Rua Luís Reis Santos, 3030-788 Coimbra, Portugal)

  • Diogo Mateus

    (ISISE, Department of Civil Engineering, University of Coimbra, Pólo II, Rua Luís Reis Santos, 3030-788 Coimbra, Portugal)

Abstract

An accurate evaluation of the thermal transmittance ( U -value) of building envelope elements is fundamental for a reliable assessment of their thermal behaviour and energy efficiency. Simplified analytical methods to estimate the U -value of building elements could be very useful to designers. However, the analytical methods applied to lightweight steel framed (LSF) elements have some specific features, being more challenging to use and to obtain a reliable accurate U -value with. In this work, the main analytical methods available in the literature were identified, the calculation procedures were reviewed and their accuracy was evaluated and compared. With this goal, six analytical methods were used to estimate the U -values of 80 different LSF wall models. The obtained analytical U -values were compared with those provided by numerical simulations, which were used as reference U -values. The numerical simulations were performed using a 2D steady-state finite element method (FEM)-based software, THERM. The reliability of these numerical models was ensured by comparison with benchmark values and by an experimental validation. All the evaluated analytical methods showed a quite good accuracy performance, the worst accuracy being found in cold frame walls. The best and worst precisions were found in the Modified Zone Method and in the Gorgolewski Method 2, respectively. Very surprisingly, the ISO 6946 Combined Method showed a better average precision than other two methods, which were specifically developed for LSF elements.

Suggested Citation

  • Paulo Santos & Gabriela Lemes & Diogo Mateus, 2020. "Analytical Methods to Estimate the Thermal Transmittance of LSF Walls: Calculation Procedures Review and Accuracy Comparison," Energies, MDPI, vol. 13(4), pages 1-27, February.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:4:p:840-:d:320780
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    References listed on IDEAS

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    1. Soares, N. & Santos, P. & Gervásio, H. & Costa, J.J. & Simões da Silva, L., 2017. "Energy efficiency and thermal performance of lightweight steel-framed (LSF) construction: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 78(C), pages 194-209.
    2. Paulo Santos & Gabriela Lemes & Diogo Mateus, 2019. "Thermal Transmittance of Internal Partition and External Facade LSF Walls: A Parametric Study," Energies, MDPI, vol. 12(14), pages 1-20, July.
    3. Lucchi, Elena, 2018. "Applications of the infrared thermography in the energy audit of buildings: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 82(P3), pages 3077-3090.
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    Cited by:

    1. Victor Lohmann & Paulo Santos, 2020. "Trombe Wall Thermal Behavior and Energy Efficiency of a Light Steel Frame Compartment: Experimental and Numerical Assessments," Energies, MDPI, vol. 13(11), pages 1-25, May.
    2. Paulo Santos & Paulo Lopes & David Abrantes, 2022. "Thermal Performance of Load-Bearing, Lightweight, Steel-Framed Partition Walls Using Thermal Break Strips: A Parametric Study," Energies, MDPI, vol. 15(24), pages 1-16, December.
    3. Paulo Santos & Paulo Lopes & David Abrantes, 2023. "Thermal Performance of Lightweight Steel Framed Facade Walls Using Thermal Break Strips and ETICS: A Parametric Study," Energies, MDPI, vol. 16(4), pages 1-16, February.
    4. Paulo Santos & Diogo Mateus & Daniel Ferrandez & Amparo Verdu, 2022. "Numerical Simulation and Experimental Validation of Thermal Break Strips’ Improvement in Facade LSF Walls," Energies, MDPI, vol. 15(21), pages 1-18, November.
    5. Paulo Santos & Keerthan Poologanathan, 2021. "The Importance of Stud Flanges Size and Shape on the Thermal Performance of Lightweight Steel Framed Walls," Sustainability, MDPI, vol. 13(7), pages 1-22, April.
    6. Tao Lu & Lauri Vähä-Savo & Xiaoshu Lü & Katsuyuki Haneda, 2023. "Thermal Impact of 5G Antenna Systems in Sandwich Walls," Energies, MDPI, vol. 16(6), pages 1-17, March.
    7. Domagoj Tkalčić & Bojan Milovanović & Mergim Gaši & Marija Jelčić Rukavina & Ivana Banjad Pečur, 2023. "Optimization of Thermal Bridges Effect of Composite Lightweight Panels with Integrated Steel Load-Bearing Structure," Energies, MDPI, vol. 16(18), pages 1-24, September.

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