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  • 1.
    Joudi, Ali
    et al.
    Högskolan Dalarna, Akademin Industri och samhälle, Energiteknik. SSAB Europe, Borlänge.
    Cehlin, Mathias
    Högskolan i Gävle.
    Svedung, Harald
    Högskolan Dalarna, Akademin Industri och samhälle, Energiteknik. SSAB Europe, Borlänge.
    Rönnelid, Mats
    Högskolan Dalarna, Akademin Industri och samhälle, Energiteknik.
    Moshfegh, Bahram
    Högskolan i Gävle.
    Numerical and experimental investigation of the influence of infrared reflective interior surfaces on building temperature distributions2017Ingår i: Indoor + Built Environment, ISSN 1420-326X, E-ISSN 1423-0070, Vol. 26, nr 3, s. 355-367Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Radiative properties of interior surfaces can affect not only the building heat flux but also the indoor environment, the latter of which has not been thoroughly investigated. The aim of this study is to analyse the effect of surface emissivity on indoor air and surface temperature distributions in a test cabin with reflective interior surfaces. This was done by comparing experimental and simulation data of the test cabin with that of a normal cabin. This study employs transient computational fluid dynamics (CFD) using re-normalisation group (RNG) k–" model, surface-to-surface radiation model and an enhanced wall function. Boundary conditions were assigned to exterior surfaces under variable outdoor conditions. The numerical and the measurement results indicate that using interior reflective surfaces will affect the indoor air temperature distribution by increasing the vertical temperature gradient depending on the time of the day. CFD simulations with high spatial resolution results show increased interior surface temperature gradients consistent with the increased vertical air temperature gradient. The influence of reflective surfaces is potentially greater with higher indoor surface temperature asymmetry. The vertical indoor air temperature gradient and surface temperatures are important parameters for indoor thermal comfort.

  • 2.
    Wäckelgård, Ewa
    et al.
    Högskolan Dalarna, Akademin Industri och samhälle, Energiteknik.
    Svedung, Harald
    Högskolan Dalarna, Akademin Industri och samhälle, Energiteknik.
    Optical characterization and modelling of paint top-coatings for low-emittance applications2016Ingår i: Infrared physics & technology, ISSN 1350-4495, E-ISSN 1879-0275, Vol. 78, s. 275-281Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The study reports on characterization of low-infrared-emittance paint top-coatings for interior building applications in which the thermal radiation becomes important in comparison with thermal conductance. The top-coating that consist of a binder with aluminium flakes has been optically characterized in the infrared wavelength range in order to determine single flake and binder emittance from reflectance measurements. The single flake emittance was found to be 0.12 for non-leafing cornflake. The absorption coefficient that determines the binder emittance as a function of binder thickness was 0.060 [μm]−2 and 0.085 [μm]−2 for Lumiflon and polyester respectively. These results were used as parameters in a simple model of the flake-binder top-coating to investigate how the emittance of the top-coating was influence by the two components and compared with a state-of-art low-emittance commercial paint. It was found from the modelling that replacing the polyester binder with Lumiflon reduces the infrared emittance (at room temperature) from 0.36 to 0.30. Increasing flake reflectance from 0.88 to 0.96 and at the same time reduce flake thickness from 2 to 1 μm gives an emittance of 0.20. However, the real samples prepared with Lumiflon showed a severe degradation caused by the flakes floating up closer to the surface which indicates a viscosity problem that needs to be solved for practical use. Thinner flakes with higher reflectance can be found if vacuum metallised pigments are used instead of ball-milled.

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