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Effect of Window Location and Surface Absorptivity on Temperature inside an Enclosure-Experimental and Numerical Study

Author Affiliations

  • 1Department of Mechanical Engineering, Global Academy of Technology, Bangalore, INDIA
  • 2Department of Mechanical Engineering, JNN College of Engineering, Shimoga, INDIA

Int. Res. J. Environment Sci., Volume 1, Issue (5), Pages 40-47, December,22 (2012)

Abstract

This paper presents the effect of outlet window location and surface absorptivity inside an enclosure on temperature, external surfaces subjected to variable heat flux boundary condition. For analysis, scaled down size of a typical room has been considered, the enclosure has inner dimension 50cm x 40cm x 30cm (LxBxH), with the longer side oriented along east-west direction. The walls and roof of the enclosure are made of 10mm thick asbestos sheet. A door of 10 cm height from the floor is considered as inlet. Experiments were conducted for outlet window of 10 cm height located at 10cm, 15 cm, 20 c measured from the floor. The external surfaces roof, east wall and west wals were heated using electrical heating coil strips. For each window configuration, temperatures of the air inside the room were recorded using data acquisition system at fifteen locations for every five minutes. From the results, it was observed that for higher surface absorptivity, lower temperature index was observed when outlet window is at mid height of the west wall. It was also observed that as the surface absorptivity at the external surfaces decreases, window located at 10 cm from the floor provides lower temperature index. Numerical simulations conducted showed lesser deviation from the experimental values.

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