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Theme B: Creating a livable, healthy and environmentally viable citiesslats. Hence the cases of the cavity closed (Step 4) and open (Step 5) areconsidered separately.6.1 Step 1 – Inside circulation (Airflow modes [1]-[2])Five experiments were conducted on August 1, 2007 (System 2). The samplingtime was 1 second, and the number of data points is 1,912(System 1) and1,440(System 2). Table 3 shows the estimated unknown parameters in Eq. (17).Table 3: Unknown parameters in inside circulationSystem 1 System 2eq.(17ξ160 0)ucaξ17 12.73 0.5024f 6.683 0.3044Simulation 13.61 15.58Measurement 14.48 14.40Table 3 indicates that for both systems, ξ 17 is the dominant for determination of f .There are significant differences in the values of f between system 1 and 2. This isdue to the fact that the friction loss, affecting the airflow in the cavity, isinfluenced by the height and width of the cavity. The higher and deeper the cavity,the less friction loss. Moreover, the form loss factor is also influenced by pressuredrop through the ventilation dampers, e.g. entrance type and opening geometry ofthe dampers. Thus, the difference in the damper shape between the two systemshas also influenced the form loss factor. For these reasons, the two systems havedifferent form loss factors ( f ).The average differences between simulated and measured airflow velocity incavity are 6.89cm/s (System 1) and 4.73cm/s (System 2). Fig 6 shows thecomparison between simulated and measured values.506
Theme B: Creating a livable, healthy and environmentally viable citiesFigure 6: comparison of inside circulation result6.2 Step 2 – Outside circulation (Airflow modes [3]-[4])Six experiments were conducted on July 31, 2007. The sampling time was 1second, and the number of data points were 2,510(System 1) and 1,797(System 2).Table 4 shows the estimated unknown parameters of Eqs. (17) and (18). Theaverage differences between simulated and measured values were 8.33cm/s and5.70cm/s.As in inside circulation, ξ 17Table 4: Unknown parameters in Outside circulationSystem 1 System 2ξ160 0eq. (17) ξ17 31.48 0.2789f 16.327 0.1793ξ18 0.016 0.0628eq. (18)ξ19 0.378 0.0898pw -0.101Pa -0.137Pauca,w 1.28cm/s 1.75cm/sSimulation 17.0098 17.6938ucaMeasurement 16.5459 17.9466is the dominant for determination of f for outsidecirculation. There is also a significant difference between the two systems.For the surface wind pressure ( p w ) of Eq. (18), the negative pressure was dominantfor both systems, causing suction out of the cavity (corresponding to cases withCp
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Funding OrganisationCOMMERCE AND EC
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Ms. S.Y. Shum, Anna, Lecturer, Divi
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以绿色思维创新绿色
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ENHANCING SUSTAINABILITY DELIVERABL
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Theme A: Connecting the Pearl River
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精宜之道 ”。所谓 “
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to use suitable technology. Additio
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Theme B: Creating a livable, health
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Page 468 and 469: Theme B: Creating a livable, health
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Theme C: Education and Market Trans
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