Experimental Study of the Effect of VentilatedCavity Wall on Building Cooling Load

Abstract

The study, which was made during August showed through calculations, that the use of ventilated cavity wall by air with temperature equal to the temperature of the space (about 25.5oC) and within air velocities range(0.0785,0.157,0.282m/s) made a percentage reduction in the cooling load caused by heat gain from the wall by(65.1,70.7,75.7%) compared with the conventional wall. Also the study showed an increase in the cavity thermal resistance with increasing ventilated air velocity and a linear relationship is obtained within the test velocities range. The experimental results of the study showed that the use of ventilated cavity wall reduced the average temperature of the inner surface of the wall during the day, andthat the amount of reduction was an average(1.45,1.53,1.71oC)during August when compared with the conventional wall and within the test velocities range, as well asthe use of ventilated cavity wall reduced the temperature difference range of the inner surface of the wall during the day and that the amount of reduction was close within therange of testvelocities, the average of reduction ranged between (0.94,1.01oC)during August when compared with the conventional wall .