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The GFA of the building is 20,000 sqm. The actual lift car capacity is 24 persons and the lift car's speed is 2 m/s; door

The GFA of the building is 20,000 sqm. The actual lift car capacity is 24 persons and the lift car's speed is 2 m/s; door width is 1.2 m with a door opening speed of 0.6 m/s. The average time for each passenger to get into and out of a lift car is assumed as 1.5 seconds. The peak demand of the lift system is 12% of the population per 5 minutes, while the population density of the building is 1 person per 12 sqm and the occupancy rate is 85%. How many lift cars are required? What is the interval?

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