TABLE OF CONTENTS - The Professional Green Building Council

Theme B: Creating a livable, healthy and environmentally viable cities3InletCenterOutletVelocity [m/sec]2100:00 3:00 6:00 9:00 12:00 15:00 18:00 21:00Figure 10: Variation of air velocity in western cavity (Oct.9. 2007)TimeTable 1: Statistical summary of air velocity in cavitiesEastWestStats. Inlet Center Outlet Inlet Center OutletMean 0.93 0.22 0.45 0.70 0.38 0.56Median 0.85 0.19 0.40 0.58 0.30 0.51S.D. 0.42 0.13 0.31 0.47 0.26 0.33Min. 0.09 0.05 0.00 0.05 0.00 0.01Max. 2.52 0.72 1.54 3.16 1.11 1.553.4 Prediction of cavity temperatureThe temperature of cavity causes influence on the heating and cooling load inbuilding, it is necessary to predict the variation of temperature according tooutdoor weather condition. In this study, the mean temperature of cavity waspredicted using multiple regression method that minimizes Error Sum of Squares(SSE). Solar radiation and outdoor air temperature were independent variables forthe regression models. The prediction result is shown in Table 2-Table 3.For east and west facing façade, two independent variables used for the predictionsmodels were acceptable. The level of significance for outdoor temperature andsolar radiation were zero. The coefficient of determination was 0.634 for eastfacing and 0.85 for west facing-façade. It appears that this occurred since the directand diffused solar radiationTable 2: Multiple regression model (east-facing )UnstandardizedCoefficients546