Q4. (a) Figure Q4-1 illustrates the arrangement of openings for a naturally ventilated building. The design outdoor temp

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Q4 A Figure Q4 1 Illustrates The Arrangement Of Openings For A Naturally Ventilated Building The Design Outdoor Temp 1 (236.25 KiB) Viewed 20 times

Q4. (a) Figure Q4-1 illustrates the arrangement of openings for a naturally ventilated building. The design outdoor temperature is 23°C, design indoor temperature is 26°C. With the information given in the Figure and appropriate assumptions, determine: (i) the location of neutral plane measured vertically from G/F; (ii) the air flow rates at openings a, b1 and b6. Assume the air density is 1.2 kg m-3, wind speed = Oms-1, flow coefficient of openings C=0.65. (15 marks) 10 m² b6 4m 4m 4 m Each opening of area 1 m² Airflow 4m Opening 4m 1m G/F Figure Q4-1 A Naturally Ventilated Building Schematic (b) Suppose the building in (a) is located in a large suburban area, the wind exponent is 0.33, the boundary layer height of the wind is 460 m, the design wind velocity from measurements at a nearby station is 10 m/s at a measurement height of 10m, the boundary layer height for the station is 270m and the wind exponent for the station is 0.14, the wind (pressure) coefficient of the windward wall b is 0.8, the wind (pressure) coefficient of the leeward wall is -0.2, the flow coefficient of openings is 0.65, the air density is 1.2 kg/m³. Determine (i) the wind pressure at the six openings (from b1 to b6) in Figure Q4-1, (ii) the effective flow area in the flow path b to a, (iii) the flow rate of the building due to the wind. 31 m (10 marks) |