Effects of Wall' s insulation thickness and position on time lag and decrement factor

摘要

In this study, effects of wall's insulation thickness and position on time lag and decrement factor have been investigated numerically. For this purpose, one-dimensional transient heat conduction equation was solved using Crank-Nicolson scheme under convection boundary conditions. To the outer surface of the wail, periodic boundary conditions were applied. The total wall thickness (insulation + thermal mass = 20 cm) was kept constant in a such a way that when the insulation thickness was increased, the thermal mass thickness was decreased in the same amount. The insulation was placed in four different locations of the wall. These locations were the inner surface, the outer surface, the center plane and half of the insulation in the inner surface and half of the insulation in the outer surface of the thermal mass.