Scientific Research and Essays

  • Abbreviation: Sci. Res. Essays
  • Language: English
  • ISSN: 1992-2248
  • DOI: 10.5897/SRE
  • Start Year: 2006
  • Published Articles: 2732

Full Length Research Paper

The effects of insulation location and thermo-physical properties of various external wall materials on decrement factor and time lag

  Türkan Goksal Ozbalta1* and Necdet Ozbalta2
  1Department of Civil Engineering, Faculty of Engineering, Ege University, 35100 Bornova-İzmir,Turkey. 2Department of Mechanical Engineering, Faculty of Engineering, Ege University, 35100 Bornova-İzmir, Turkey.
Email: [email protected]

  • Article Number - BFC200116570
  • Vol.5(23), pp. 3646-3659, December 2010
  •  Accepted: 05 October 2010
  •  Published: 31 December 2010

Abstract

 

 

Technological improvements and population growth make energy saving more important especially for developing countries. As known, a considerable amount of consumed energy is used for space heating in buildings; therefore, using insulation for external wall has gained more importance. In this sense, this study, which consists of two parts, examines the efficiency of insulation location and thermo-physical properties of various external wall materials (brick, reinforced and lightweight concrete). In the first part, the optimum insulation thickness of external walls for various wall materials and different fuel types in cold region (Eskişehir) has been investigated. The optimization is based on the P1-P2 method. Besides, the effect of the thermal properties of different wall constructions and the location of insulation on time lag and decrement factor are studied; and then, the daily thermal behaviours of various wall constructions are simulated. In consequence of the study, time lags were determined between 4.34 and 6.74 on the outer insulated walls and 3.64 and 5.86 on the inner insulated walls. The decrement factor was computed between 0.008 - 0.023 and 0.019 - 0.029 respectively.

 

Key words: External wall, time lag, decrement factor, P1-P2 method, optimum insulation thickness.

 

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