August 2010 Elevator System with Multiple Cars in One Hoistway

SPECIAL NOTICE: Please check each course for verification of approval before purchasing.

This test is based on the article, Elevator System with Multiple Cars in One Hoistway, published in the August 2010 issue and counts as 2 Contact Hours (0.2 CEU) towards recertification. Most courses are approved by NAEC for CET/CAT and NAESAI for QEI and in the following states: Alabama, Arkansas, Colorado, Florida, Georgia, Illinois, Indiana, Kentucky, Maryland, Mississippi, Missouri, Oklahoma, Pennsylvania, Vermont, Virginia, Washington, West Virginia, Wisconsin.

Learning Objectives - After reading this article, you should have learned about:

• Having an elevator system with multiple cars in the same hoistway is an old idea, but except for one experimental use in the very early days, it has not been used in the real world for a long time
• Elevator systems with multiple cars in the same hoistway in large office buildings are used to increase lifting capacity
• Elevator systems with multiple cars in the same hoistway in residential buildings may be used for each car to provide a different type of service
• Elevator systems with multiple cars in the same hoistway must be equipped with one or more collision-prevention system(s) to ensure safe operation
• The round-trip time is the key parameter in an elevator system's design
• The time-space diagram is an important tool used in the design and analysis of transportation systems, including the elevator system
• Normalized capacity and normalized net capacity are key indicators that express the elevator system efficiency
• Elevator shafts may be minimized (or optimized) when each car in the shaft stops at few floors
• It is important to have enough spare shafts that can be used when elevator shafts fail
• Computing operational parameters using the deterministic method (instead of the probabilistic method) works fine when one deals with a system that has few stops in the morning peak period

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