Authors
Abstract
A numerical study has been done on Iraqi buildings (Baghdad) on 21st
July to reduce the cooling load using a new system of geothermal energy. For
this purpose, a flat vertical plate with high thermal conductivity extended into
ground in 3 m deep used with eastern and southern walls construction.
The study shows that when using a plate only (without insulation) the
cooling load is reduced by (13.2 %) and (12.7 %) for eastern and southern
walls respectively. In addition, it shows that when using insulation at different
arrangements the plate at the southern wall succeeds reduce in the cooling
load by (8 %, 14.5% and 40 %) and (8 %, 15.8% and 41.3 %) at the eastern
wall.
The study shows also that at some arrangements using flat plate with
insulation, one can reach a very smooth cooling load distribution for southern
and eastern walls, which gives a good and easy controlling of air temperature
of the space. Also it can be seen from this study that the plate reduces the
temperature of the walls outside surface especially when using insulation at
the outside surface which means that the plate reduces the temperature and
dissipats the thermal stresses which cause the cracks in the walls outside
surface. The temperature reduction occurs in both walls at peak load, which
means that the heat is dissipated to the ground.
As the inside, temperature of the wall surface has a great effect on the
thermal comfort of occupants in the conditioned space and on the natural
convection inside the space, when there is a good coincidence between the
southern and eastern walls there will be a better thermal comfort. The plate
also succeeded in making the inside surface temperature of the southern and
eastern walls very close. The available experimental data from the literature
for solar radiation, outdoor temperature and under-ground soil temperature
gave a good agreement when compared with the theoretical results obtained
from the used equations and programs in this research.
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