Mathematical Model of Heat Transfer from External Wall into Interior Wall by Using Lightweight Concrete, Brick and Concrete Block

Abstract

One of the crucial factors that affects significantly the highly energy consumption of air-conditioners in building, is the temperature inner and outer of walls. The highly requirement of energy is typically due to the heat transfer from Sun-heat through the outer surface into inner surface of the walls. In order to decrease the energy consumption used by air-conditioners, the current study applied the mathematical model to calculate the temperatures within the walls made of three different materials; concrete, bricks and concrete blocks. This study evaluated the different thickness of each wall materials which were 20, 30, and 40 centimeters respectively with different thermal conductivity as well as material density. By using one-dimensional heat equation as a governing equation used to describe the heat transfer from outside to the inside of the wall and to the inner surface of the wall and using finite difference method to solve the governing equation. The results showed that the lightweight concrete wall has the lowest heat transfer that would be recommended to use as a wall material.