The Effect of Magnitude and Direction of Heat Flow on the Thermal Conductivity for Insulation Materials (Glass Wool) by Using Probe Method

  • Authors

    • Hussein Humaish
    • . .
    2018-11-28
    https://doi.org/10.14419/ijet.v7i4.20.26414
  • Flow, Glass wool, Insulation, probe method, Thermal conductivity.

  • The thermal energy of building is determined by the thermal properties of the materials and how to install these materials in the elements of buildings according to the direction of heat transfer. The effectiveness of thermal insulation (glass wool) is dependent on its thermal conductivity which is varies in different directions of fibers of glass wool. Glass wool is formed of fibers and binders tangled together during the industrial process to provide some elasticity. The experimental values of thermal conductivity of the insulation materials are changed according to magnitude of the heat power and direction of fiber arrangement. The thermal conductivity for insulation materials has been measured by using probe method,  Huekseflux ® TP02 used to measure the thermal conductivity by emit the flow perpendicular and parallel to the fibers of glass wool. Two samples of yellow glass wool (density 68 kg/m3) with dimensions (10 ×10 ×30) cm have been used. Hot Disk bulk isotropic module has been used to evaluate thermal conductivity. TPS source (Hot Disk probe reference: 4922) characterized by a diameter of 14.61 mm has been selected. COMSOL® multiphysics axisymmetric 2D model has been used to follow the axial and the radial directions of the heat transfer.

     

  • References

    1. [1] Mantle WJ, Chang WS. Effective thermal conductivity of sintered metal fibers. IEEE 899034; 1989.

      [2] Woo SS, Shalev I, Barker RL. Heat and moisture transfer through nonwoven fabrics. Part 1: Heat transfer. Text Res J 1994; 64(3):149–62.

      [3] Daryabeigi K. Heat transfer in high-temperature fibrous insulation. J Thermophys Heat Trans 2003; 17(1):10–20.

      [4] Mohammadi M, Banks-Lee P, Ghadimi P. Determining radiative heat transfer through heterogeneous multilayer nonwoven materials. Text Res J 2003; 73(10):896–900.

      [5] Bankvall C. Heat transfer in fibrous materials. J Test Eval 1973; 1(3):235–43.

      [6] Van der Held “The contribution of radiation to the conduction of heatâ€, Applied Scientific Research, Section A, Vol 3, pp 237-249, 1952.

      [7] Van der Held “The contribution of radiation to the conduction of heat: boundary conditions†Applied Scientific Research, Section A, Vol. 4, pp 77-99, 1953.

      [8] W. Woodside “Calculation of the thermal conductivity of porous media†Canadian Journal of Physics, Vol. 36, pp. 815-823, 1958.

      [9] Escher A, GrosskopfB, Jeschke P (1974) Experiences with the hot-wire method for the measurement of thermal conductivity of refractories, Tonind-Ztg, v .98 , nr.9, pp.212 ...

      [10] Davis WR, Downs A (1980) The hot wire test - a critical review and comparison with the BS 1902 panel test, Transactions British Ceramic Society, v. 79, pp.44-52

      [11] H.S. Carslaw, J.C. Jaeger; Conduction of Heat in Solids, 2nd Ed.; Oxford University, London; 1959.

      [12] Abramowitz M, Stegun I, Handbook of Mathematical Functions with Formulas, Graphs and Mathematical Tables, Chapter 5, 9th Dover Printing, 10th GPO Printing Ed., Dover, 1964.

      [13] Achard G., Roux J.J, Sublet, J.C “Description d’une sonde de mesure des caractéristiques thermiques des couches superficielles du sol. Résultats d’une campagne de mesuresâ€, Revue Générale de Thermique, N° 267, pp 177-188, 1984.

      [14] Vos B, Analysis of thermal-probe measurements using an iterative method to give sample conductivity and diffusivity data, Appl. Sci. Res., pp. 425–438, 1955.

      [15] ASTM D 5334 – 08, Standard Test Method for Determination of Thermal Conductivity of Soil and Soft Rock by Thermal Needle Probe Procedure, Approved 2008.

      [16] Humaish H, Ruet B, Marmoret L , Beji H, Thermal characterization of highly porous materials by the hot wire method, in proceeding of the French Thermal Society (SFT) congress, La Rochelle, France,Vol.23, 2015.

      [17] R. Coquard, D. Baillis, D. Quenard Experimental and theoretical study of the hot-ring method applied to low-density thermal insulators, International Journal of Thermal Sciences, 47, pp 324–338, 2008.

      [18] Pilkington B, In situ measurements of building materials using a thermal probe, phD, University of Plymouth, England, 2008.

      [19] Batty WJ, O'Callaghan PW, Probert SO, Assessment of the thermal-probe technique for rapid, accurate measurements of effective thermal conductivities, Applied Energy, Vol.16, pp. 83-113, 1984.

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    Humaish, H., & ., . (2018). The Effect of Magnitude and Direction of Heat Flow on the Thermal Conductivity for Insulation Materials (Glass Wool) by Using Probe Method. International Journal of Engineering & Technology, 7(4.20), 536-540. https://doi.org/10.14419/ijet.v7i4.20.26414