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Comparison between Direct and Indirect Heat Flux Measurement Techniques: Preliminary Laboratory Tests

Author

Listed:
  • Luca Evangelisti

    (Department of Industrial, Electronic and Mechanical Engineering, Roma TRE University, Via Vito Volterra 62, 00146 Rome, Italy)

  • Leone Barbaro

    (Department of Industrial, Electronic and Mechanical Engineering, Roma TRE University, Via Vito Volterra 62, 00146 Rome, Italy)

  • Claudia Guattari

    (Department of Philosophy, Communication and Performing Arts, Roma TRE University, Via Ostiense 139/10, 00154 Rome, Italy)

  • Edoardo De Cristo

    (Department of Industrial, Electronic and Mechanical Engineering, Roma TRE University, Via Vito Volterra 62, 00146 Rome, Italy
    Department of Engineering, Niccolò Cusano University, Via Don Carlo Gnocchi 3, 00166 Rome, Italy)

  • Roberto De Lieto Vollaro

    (Department of Industrial, Electronic and Mechanical Engineering, Roma TRE University, Via Vito Volterra 62, 00146 Rome, Italy)

  • Francesco Asdrubali

    (Department of International Human and Social Sciences, Perugia Foreigners’ University, Piazza Fortebraccio 4, 06122 Perugia, Italy)

Abstract

Direct and indirect approaches can be employed for estimating the heat flow through components in different application fields. In the building sector, the thermometric method is often applied by professionals for thermal transmittance evaluations. However, miscalculations can derive from inaccurate total heat transfer coefficients, and a consensus regarding the appropriate value to employ remains to be determined. Here, an apparatus was realized for laboratory tests and heat flux measurements were performed following direct and indirect approaches. Data acquired through a common heat flow sensor were compared with those computed through a post-processing based on radiative and convective estimations. The results were affected by the specific correlation adopted for computing the convective coefficients, with the percentage differences ranging from −9.8% to −0.4%. New measurement systems could be designed for automatically computing heat fluxes through indirect approaches, thus providing alternative solutions in the panorama of non-destructive tests for building energy diagnosis.

Suggested Citation

  • Luca Evangelisti & Leone Barbaro & Claudia Guattari & Edoardo De Cristo & Roberto De Lieto Vollaro & Francesco Asdrubali, 2024. "Comparison between Direct and Indirect Heat Flux Measurement Techniques: Preliminary Laboratory Tests," Energies, MDPI, vol. 17(12), pages 1-16, June.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:12:p:2961-:d:1415965
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    References listed on IDEAS

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    1. Ohlsson, K.E.A. & Olofsson, T., 2014. "Quantitative infrared thermography imaging of the density of heat flow rate through a building element surface," Applied Energy, Elsevier, vol. 134(C), pages 499-505.
    2. Fokaides, Paris A. & Kalogirou, Soteris A., 2011. "Application of infrared thermography for the determination of the overall heat transfer coefficient (U-Value) in building envelopes," Applied Energy, Elsevier, vol. 88(12), pages 4358-4365.
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