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Figure 5 : Conventional ( top ) versus destination dispatching system ( bottom ). ( Source : http :// www . ThyssenKrupp . com ).
Other Applications Some systems use the card reader to alert the elevator to special needs . For example , a passenger who has trouble walking could be assigned to a closer elevator , or the doors could be held open longer .
If someone uses a wheelchair , fewer people could be assigned to the elevator to be sure that there is enough space . If someone is blind , a recording could speak the elevator letter or number . An elevator system could even be integrated into a building ’ s heating and cooling system so the temperature could be adjusted when people arrive in the morning and leave in the evening . DDS can also play a role when construction or renovation work is being performed . Facility executives could set keycards to access only the floors under construction for long-term contractors while locking out access to floors of the rest of the building [ 26 ].
Standby Solutions Standby solutions power down the elevator ’ s equipment when it is not in use , providing substantial energy savings , especially in buildings with periods of low elevator usage . In-cab sensors and software automatically switch to “ sleep mode ,” turning off lights , fans , music , and video screens when unoccupied . Energy savings from standby solutions could vary between 25 % and 80 % of the overall consumption of the elevator , depending on multiple variables including the employed control system , lighting type , floor displays and operating consoles on each floor and inside the elevator cabin . For example , the lighting feature would greatly factor in the saving formula . Lighting inside the elevator cabin can be switched off 40s after the weight sensor “ feels ” that there is no one inside , thus switching to standby power , which can be relatively inexpensive in many cases , and can dramatically cut total energy use .
22 VOL 94 APRIL-JUNE 2023