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Thermal Transmittance of Internal Partition and External Facade LSF Walls: A Parametric Study

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

Light steel framed (LSF) construction is becoming widespread as a quick, clean and flexible construction system. However, these LSF elements need to be well designed and protected against undesired thermal bridges caused by the steel high thermal conductivity. To reduce energy consumption in buildings it is necessary to understand how heat transfer happens in all kinds of walls and their configurations, and to adequately reduce the heat loss through them by decreasing its thermal transmittance ( U -value). In this work, numerical simulations are performed to assess different setups for two kinds of LSF walls: an interior partition wall and an exterior facade wall. Several parameters were evaluated separately to measure their influence on the wall U -value, and the addition of other elements was tested (e.g., thermal break strips) with the aim of achieving better thermal performances. The simulation modeling of a LSF interior partition with thermal break strips indicated a 24% U -value reduction in comparison with the reference case of using the LSF alone ( U = 0.449 W/(m 2 .K)). However, when the clearance between the steel studs was simulated with only 300 mm there was a 29% increase, due to the increase of steel material within the wall structure. For exterior facade walls ( U = 0.276 W/(m 2 .K)), the model with 80 mm of expanded polystyrene (EPS) in the exterior thermal insulation composite system (ETICS) reduced the thermal transmittance by 19%. Moreover, when the EPS was removed the U -value increased by 79%.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:14:p:2671-:d:247695
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    References listed on IDEAS

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    1. Antonio Paone & Jean-Philippe Bacher, 2018. "The Impact of Building Occupant Behavior on Energy Efficiency and Methods to Influence It: A Review of the State of the Art," Energies, MDPI, vol. 11(4), pages 1-19, April.
    2. 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.
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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 & Telmo Ribeiro, 2021. "Thermal Performance Improvement of Double-Pane Lightweight Steel Framed Walls Using Thermal Break Strips and Reflective Foils," Energies, MDPI, vol. 14(21), pages 1-16, October.
    5. 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.
    6. 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.
    7. 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.
    8. 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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