ABSTRACT
This chapter presents case study that considers a building prior to a modernisation. Factors to be considered in this building are: that it has two entrances; two cores serving different numbers of floors; and an escalator service to the lower four floors. The vertical transportation facilities in this building defy the principles of good circulation and lift location practice. However, as occupants must walk some distance to each group, this has the effect of smoothing any peak flows that occur, and easing the demand on the lift system. A modern system employing a variable voltage, variable frequency (VVVF) control can deliver excellent performance times of some 9.5 s over the 4.5 m interfloor distances. This, combined with landing call dwell times set at 3 s and with passenger detectors capable of initiating differential door timing, will make the cycle time dependent on passenger movements rather than equipment timers. Improved signalling enables passengers to quickly identify the next lift.
