Calculation and Experimental Evaluation of the Thermal Resistance of a Structure with Reflective Insulation

Abstract:

As reason of increasing requirements of thermal insulation properties of the exposed envelope, reflective insulation are among kind of modern thermal insulation materials ones, which can significantly increased thermal insulation performance if their application is correct. Thermal insulation performance is caused by reduction of the heat transfer by radiation. Conjunction of low-emissivity surface of the reflective insulation and air layer is important to account. This article is focused on the determination of thermal properties of reflective insulation and the results of measured values thermal resistance of determination by hot box method using heat flow meter are presented here. As part of determination of thermal properties of reflective insulation by experimental methods, the test element used to measure the thermal resistance of an insulated air cavity had to be created for concordance with the normative requirements. The part of this article is determination of the thermal resistance by the calculation of derived physical relations and comparison with values of the laboratory measurement.

• Periodical: Advanced Materials Research (Volume 899)
• Pages: 374-380
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.899.374
• Online since: February 2014
• Authors: Jiří Kalánek*, Libor Šteffek, Milan Ostrý
• Keywords: Emissivity, Hot Box, Radiation Heat Flow Rate, Reflective Insulation, Thermal Resistance

References

[1] Act No. 406/2000 Coll. - On energy managment and related regulations, Czech Republic (Zákon č. 406/2000 Sb.: o hospodaření energií, ve znění pozdějších předpisů).

[2] Decree No. 78/2013 Coll. - on the energy performance of buildings, Czech Republic (Vyhláška č. 78/2013 Sb.: o energetické náročnosti budov).

[3] ČSN 73 0540-2: 2011+Z1: 2012 Thermal protection of buildings - Part 2: Requirements (Tepelná ochrana budov - část 2: Požadavky).

[4] T. Petříček, P. Kacálek, R. Smolka. Skladby šikmé střechy a vhodná aplikace tepelné izolace. In: Brno, 2011, Available: http: /www. fce. vutbr. cz/veda/JUNIORSTAV2011/pdf/1. 2.

[5] M.J. Tenpierik, E. Hasselaar. Reflective multi-foil insulations for buildings: A review. Energy and buildings. 2013, vol. 56.

DOI: 10.1016/j.enbuild.2012.10.003

[6] M. Belusko F. Bruno, W. Saman. Investigation of the thermal resistance of timber attic spaces with reflective foil and bulk insulation, heat flow up. Applied energy. 2011, vol. 88, no. 1.

DOI: 10.1016/j.apenergy.2010.07.017

[7] I.E. Smith; S. Probert. Effectiveness of reflective foil as thermal insulation. Applied energy. 1979, vol. 5, no. 1.

[8] Reflective Insulation, Radiant Barriers And Radiation Control Coatings. RIMA International [online]. 2002 [cit. 2013-09-12]. Available: http: /www. rimainternational. org/wp-content/uploads/2011/02/handbook. pdf.

[9] EN 6946 Building components and building elements - Thermal resistance and thermal transmittance - Calculation method. (Stavební prvky a stavební konstrukce - Tepelný odpor a součinitel prostupu tepla - Výpočtová metoda).

DOI: 10.3403/00942964u

[10] EN 16012. Thermal insulation for buildings - Reflective insulation products - Determination of the declared thermal performance. (Tepelná izolace budov – reflexní izolační výrobky – stanovení deklarovaných tepelných vlastností).

DOI: 10.3403/30206131

[11] EN 8990 Thermal insulation - Determination of steady state thermal transmission properties - Calibrated and guarded hot box (Tepelná izolace - Stanovení vlastností prostupu tepla v ustáleném stavu - Kalibrovaná a chráněná teplá skříň).

DOI: 10.3403/00916705u

[12] Authors archives.

[13] G. Lopez, L. Basterra, L. Acuna. Determination of the Emissivity of Wood for Inspection by Infrared Thermography. Journal of nondestructive evaluation. 2013, vol. 32, no. 2.

[14] S. Šťastník, J. Hollan, R. Steuer. Možnosti určení emisivity materiálů pomocí infračervené termografie. Http: /amper. ped. muni. cz [online]. [cit. 2013-12-11]. Available from: http: /amper. ped. muni. cz/jenik/LW-infrared.