AN EXPERIMENTAL STUDY ON OVERALL HEAT TRANSFER COEFFICIENT OF SOME WALL BRICK MODELS


Rahmanparast A., Çuhadaroğlu B. , Kan F. E.

5th International Anatolian Energy Symposium, Trabzon, Turkey, 24 - 25 March 2021, pp.33-40

  • Publication Type: Conference Paper / Full Text
  • City: Trabzon
  • Country: Turkey
  • Page Numbers: pp.33-40

Abstract

It is known well that the majority of the heat losses of buildings occur at outer walls, which are made of a few

layers such as plaster, wall bricks, insulation material, etc. It is expected that the wall bricks having a low overall

heat transfer coefficient to reduce heat losses through buildings in order to increase building heating

performance. To achieve this expectation, the wall bricks are produced with materials with low thermal

conductivity and cavity (hole), which weakens the thermal transport mechanism. This study, it is aimed to

decrease the overall heat transfer coefficient of wall brick models with various cavities, which affect the natural

convection mechanism. For this purpose, some changes are made to the cavity geometry of a single cell of the

hollow wall brick model. The proposed geometries' heat transfer experiments were repeated under three different

(7, 9, 12 W) thermal powers. The building is simulated as an insulated chamber made of styrofoam with 300 mm

x 300 mm x 300 mm. The wall brick models are produced from PVC (decota) material in 160 mm x 160 mm x

50 mm and mounted to a wall of the insulated chamber. The experiments are carried out on the brick models

having the cavity geometries of regular symmetrical I profile and asymmetrical Z profile. The temperatures are

measured at 3 points on both sides of the brick models. It has been measured that the overall heat transfer

coefficient of the Z model is lower than that of the regular I profile at 7.1%, depending on the heat transfer

direction.