• P-ISSN 0974-6846 E-ISSN 0974-5645

Indian Journal of Science and Technology


Indian Journal of Science and Technology

Year: 2008, Volume: 1, Issue: 5, Pages: 1-4

Original Article

Effect of air gap on thermal performance of composite wall section


 The property of low thermal transmission of small air gap between the constituents of combine material has been utilized to obtain energy efficient wall section. The paper describes the method to determine coefficient of overall thermal transmittance of combine materials with and without air gap. The combine section mainly consists of cement concrete, polycrete, PVC sheet, polyurethane foam, expanded polystyrene and air gap. Effect of air gap on thermal insulation of wall has been determined. Results of the study show that 38 mm air gap between polycrete slabs gives the lower value of over all thermal transmittance which satisfies the minimum requirement of wall to maintain indoor temperature between 2-160 C in a room as per code IS: 661.

Key words: Air gap, Concrete building, Combine material, Energy efficient multilayer section, Thermal resistance, Transmittance.


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