TABLE OF CONTENTS - The Professional Green Building Council

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Theme B: Creating a livable, healthy and environmentally viable citiesthat the cavity of System 2 is lower than that of System 1 (Table 1), pw and u,greater because the prevailing outdoor wind direction is perpendicularly acting onthe window surface, increasing the surface wind pressure.As Eq (4) indicates, the cavity depth is inversely proportional to u,ca wca ware. A highercavity increases the wind pressure difference between the top and bottom damper.In other words, the higher and shallower the cavity, the greater uca,wbecomes. Forwant of space, a figure to compare measurement and simulation for outsidecirculation was not presented in the paper.6.3 Step 3 – Diagonal flow (Airflow mode [5]-[8])Six experiments were conducted in the diagonal circulation mode (Aug 6-11,2007). The sampling time was 1 second, and the number of data points were2,205(System 1) and 1,774(System 2). During the experiments for System 1conducted in winter days [1], the indoor temperature was higher than outside, andthe building was pressurized by HVAC system by about 4 Pa. On the other hand,experiments for System 2 were conducted in summer, so the outside temperaturewas higher than inside, and there was no pressurization by HVAC system. Forthese reasons, airflow modes [5] and [6] occurred in System 1 and modes [7] and[8] in System 2. Table 5 tabulates the estimation results of the unknown parametersin Eqs. (19) and (20).Table 5: Unknown parameters in diagonal flowSystem 1 System 2ξ20 0.0729 0.1370eq.(19) ξ21 0.1985 0.0959c 0.0729 0.1247ξ ( 22 0.2494 0.3435eq.(20) Δ p 3.39 Pa 3.14 PaQca 0.0819 0.180Simulation 39.01 23.37ucaMeasurement 31.75 20.13508
Theme B: Creating a livable, healthy and environmentally viable citiesTheΔpincludes pressures caused by indoor-outdoor temperature difference,surface wind pressure ( p w ) and pressurization by HVAC system. System 1's cavityair velocity ( u ca ) was affected by all three factors above, and System 2 was affectedby the temperature difference and surface wind pressure ( pw ) without HVACpressurization.The flow coefficient ( c ) in Eq. (19) accounts for the efficiency at allowing fluidflow, and is affected by the area, depth and shape of the opening. System 2's flowcoefficient ( c ) is greater because the width of the ventilation damper of system 2 isgreater than that of system 1, thus helping the airflow. The average differencesbetween the simulated and measured values were 15.89cm/s (System 1) and10.23cm/s (System 2).6.4 Step 4 – Cavity closed (Airflow mode [10])The fourth step was conducted for about 85 hours (Aug 18-22, 2007). Thesampling time was 1 minute, and the numbers of data points were 4,507 (System 1)and 5,126 (System 2). Table 6 summarizes the results of parameter estimation, andthe average differences between the simulated and measured temperatures were1.59℃ (system 1) and 1.06℃ (system 2).Table 6: Unknown parameter in cavity closedSystem 1 System 2ξ1 0.9244 1.2812ξ2 0.5564 0.5256eq.(11)ξ3 0.4594 0.9299uout 0.744 0.323ulsv 0.488 0.460hout 9.16 11.64eq. (12) ξ4 3.9859 1.7629hca,1 6.7 3.95eq. (13) ξ5 2.7927 1.4384ξ6 2.2513 1.2608ξ7 0.2679 0.2522Δ T 2.97°K 1.68°K509
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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 470 and 471: Theme B: Creating a livable, health
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Theme C: Education and Market Trans
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