【Daily Question】Issue 20150902 Test

7.2x104 m3/h

7.2x104 m3/h. . . . . . . . . . . . . . . .

For items AB, it should be no less than 6 times the volume.

For the atrium of a high-rise public building with a volume of 18,000 m3, which of the following design values for smoke exhaust volume does not meet the requirements? My answer is AB. I’m not from the HVAC field, so I’m not entirely sure. My calculation shows that an air exchange rate of 6 times per hour should be achieved; 10.8x10^4 is the minimum value, and any value lower than this does not meet the requirements. . So I chose AB. . If incorrect, please **correct it~~ A 7.2x10^4 m3/h B 10.2x10^4 m3/h C 10.8x10^4 m3/h D 11.2x10^4 m3/h

For the atrium of a high-rise public building with a volume of 18,000 m3, which of the following design values for smoke exhaust volume does not meet the requirements? A A 7.2x104m3/h B 10.2x104m3/h C 10.8x104m3/h D 11.2x104m3/h

The answer is :D BCD ；

Choose A 7.2x104m3/h

7.2x104 m3/h

The building codes specify as follows: for a volume greater than 18,000 m³, 4 exchanges are sufficient; however, if the volume is greater than 102,000 m³/h, then only option A does not meet the standards. 9.4.5 The exhaust volume of the mechanical smoke extraction system shall not be less than the values specified in Table 9.4.5. Table 9.4.5 Minimum smoke exhaust volume for mechanical smoke exhaust systems: Conditions and areas, Unit smoke exhaust volume (m3/h·m2), Number of air changes per hour, Remarks. For one smoke control zone: 60 – The smoke exhaust volume per fan should not be less than 7200 m3/h. For spaces with a clear height of more than 6.0 m and without any division into smoke control zones: 120 – The value should be determined based on the area of the largest smoke control zone. For atriums: If the volume is 17000 m3 or less: – 6; if the volume is greater than 17000 m3, the smoke exhaust volume should not be less than 102000 m3/h. Volume greater than 17,000 m3 – 4

The building codes specify as follows: for a volume greater than 18,000 m³, 4 exchanges are sufficient; however, if the volume is greater than 102,000 m³/h, then only option A does not meet the standards. 9.4.5 The exhaust volume of the mechanical smoke extraction system shall not be less than the values specified in Table 9.4.5. Table 9.4.5 Minimum smoke exhaust volume for mechanical smoke exhaust systems: Conditions and areas, Unit smoke exhaust volume (m3/h·m2), Air change rate (times/h), Remarks. For 1 smoke control zone: 60 – The smoke exhaust volume per fan should not be less than 7200 m3/h. For spaces with a net ceiling height of more than 6.0 m and without separate smoke control zones: 120 – The value should be determined based on the area of the largest smoke control zone. When the volume of the atrium is 17000 m3 or less: 6; when the volume is greater than 17000 m3, the smoke exhaust volume should not be less than 102000 m3/h. Volume greater than 17,000 m3–4