Abstract
The main purpose of temperature insulation is to increase the thermal transport resistance of structural materials. The products used for thermal insulation are usually classified as either open cell or closed cell. Expanded polystyrene (EPS), extruded polystyrene (XPS), expanded nitrile rubber (ENR), polyurethane (PUR), polyethylene (PE) and ethylene vinyl acetate (EVA) are examples of some basic closed-cell insulation materials. Thermal conductivity varies depending on density, pore structure and dimensions, as well as the moisture content and temperature of a material. According to the American Society for Testing and Materials ASTM-C518 standard, thermal conductivity is only given for a temperature value of 10 °C. However, climate conditions, environmental temperature and moisture values vary over the course of the day. Therefore, it is important to determine the thermal conductivity of insulation materials that depend on temperature for different climate conditions. In this study, k values of EPS, XPS, ENR, PUR and EVA insulation materials are measured depending on the temperature and density by using heat flow meter methods according to EN 12664, 12667 and ASTM C518 standards. Experimental measurements are taken for temperatures ranging between −10 and −50 °C. From the results, it is observed that k values increase when the temperature increases and decrease when the density increases, for all insulation materials measured. Also, the most rapid change of the k value varying with density is seen with EPS-8.9 (kg/m3) material, while the most rapid change of the k value varying with temperature occurs with PE-35 (kg/m3) material. In contrast, the least deviation of the k value from the nominal value occurs for EVA-60.
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References
Jelle B.P.: Traditional, state-of-the-art and future thermal building insulation materials and solution—properties, requirements and possibilities. Energy Build. 43, 2549–2563 (2011)
Bayrakçı H.C., Davraz M., Başpınar E.: New generation of thermal insulation materials: vacuum insulation panel. SDU J. Tech. Sci. 1(2), 1–12 (2011)
Al-Homoud M.S.: Performance characteristics and practical applications of common building thermal insulation materials. Build. Environ. 40, 353–366 (2005)
http://allthumbsdiy.com/references/spray-polyurethane-foam/open-vs-closed-cell-foam-insulation
ASTM C518: Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus. American Society for Testing and Materials, Philadelphia, Pa., 15 p (2003)
EN 12664: Thermal Performance of Building Materials and Products–Determination of Thermal Resistance by Means of Guarded Hot Plate and Heat Flow Meter Methods-Dry and Moist Product of Medium and Low Thermal Resistance. European committee for standardization, Brussels (2001)
EN 12667: Thermal Performance of Building Materials and Products–Determination of Thermal Resistance by Means of Guarded Hot Plate and Heat Flow Meter Methods-Dry and Moist Product of High and Medium Thermal Resistance. European committee for standardization, Brussels (2001)
Halıcı, F.; Gündüz, M.: With Examples of Heat Transfer/Heat Transfer. Birsen Bookstore, Turkey (2007)
Aldrich, D.F.; Bond, R.H.: Thermal performance of rigid cellular foam insulation at subfreezing temperatures, In: Thermal Performance of the Exterior Envelopes of Buildings III. ASHRAE/DOE/BTECC Conference, pp. 500–509. Florida (1985)
Wakili K.G., Binder B., Vonbank R.: A simple method to determine the specific heat capacity of thermal insulations used in building construction. Energy Build. 35, 413–415 (2003)
Wilkes, K.E.; Child, P.W.: Thermal performance of fiberglass and cellulose attic insulation. In: Thermal Performance of the Exterior Envelopes of Buildings V, ASHRAE/DOE/BTECC/CIBSE Conference, Clear water beach, pp. 357–367. Florida (1992)
Besant, R.W.; Miller, E.: Thermal resistance of loose-fill fiberglass insulation spaces heated from below. In: Thermal Performance of the Exterior Envelope of Building II, ASHRAE/DOE Conference, pp. 720–733. Las Vegas (1982)
Karakoç, T.H.; Turan, O.; Binyıldız, E.; Yıldırım, E.: Heat Insulation. ODE publication, Turkey (2011)
İZOCAM: Heat, Sound, Fire Insulation. Technical handbook. Turkey (1981)
Abdou A.A., Budaiwi I.M., Al-Homoud M.: Comparison of thermal conductivity measurement of building insulation materials under various mean temperatures. J. Build. Phys. 29, 171–184 (2005)
Gnip I., Vejelis S., Vaitkus S.: Thermal conductivity of expanded polystyrene (EPS) at 10 °C and its conversion to temperatures within interval from 0 to 50 °C. Energy Build. 52, 107–111 (2012)
D-Munoz F., Anderson B., C-Lopez J.M., C-Andres A.: Uncertainty in the thermal conductivity of insulation materials. Energy Build. 42, 2159–2168 (2010)
Lakatos A., Kalmar F.: Investigation of thickness and density dependence of thermal conductivity of expanded polystyrene insulation materials. Mater. Struct. 46, 1101–1105 (2013)
Lakatos A.: Comparison of the thermal properties of different insulating materials. Adv. Mater. Res. 899, 381–386 (2014)
Ochs F., Heidemann W., Müller-Steinhagen H.: Effective thermal conductivity of moistened insulation materials as a function of temperature. Int. J. Heat Mass Transf. 51, 539–552 (2008)
Karamanos A., Hadiarakou S., Papadopoulos A.M.: The impact temperature and moisture on the thermal performance of stone wool. Energy Build. 10, 1402–1411 (2008)
Kochhar, G.S.; Manohar, K.: Effect of moisture on thermal conductivity of fibers biological insulating materials. In: Thermal Performance of the Exterior Envelopes of Building VI. ASHRAE/DOE Conference, pp. 33–40. Florida (1995)
Lakatos A., Kalmar F.: Examination of the change of the overall heat transfer coefficients of building structure in function of water content. Build. Serv. Eng. Res. Technol. 35(5), 507–515 (2014)
Lakatos, A.: Investigation of water sorption properties of different insulating materials. In: International virtual conference on advanced research in scientific areas, Zilina, Slovakia, pp. 1827–1831 (2012)
Abdou A., Budaiwi I.: The variation of thermal conductivity of fibrous insulation materials under different levels of moisture content. Constr. Build. Mater. 43, 533–544 (2013)
BudaiwiAbdou, A.: The impact of thermal conductivity change of moist fibrous insulation on energy performance of building under hot humid conditions. Energy Build. 60, 388–399 (2013)
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Koru, M. Determination of Thermal Conductivity of Closed-Cell Insulation Materials That Depend on Temperature and Density. Arab J Sci Eng 41, 4337–4346 (2016). https://doi.org/10.1007/s13369-016-2122-6
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DOI: https://doi.org/10.1007/s13369-016-2122-6