INGENIEUR
INGENIEUR
Figure 4 : Diagram of OTIS GeN2 Lift . ( Source : http :// www . otisworldwide . com ).
weight also reduces the energy needed in the acceleration and deceleration phases , resulting in about 15 % energy reduction . In summary , once the rope weight is reduced , the whole elevator system becomes more efficient .
The TWIN System Germany-headquartered ThyssenKrupp , jointly with Eros Elevators & Escalators , developed a TWIN system for high-rise buildings . The advantage of the TWIN is that two cabs run independently in a single shaft . The system keeps a safe distance between the two elevators ( upper and lower cabins ) that are running on top of each other [ 33 , 34 ]. The TWIN system basically provides savings in space as it cuts the number of shafts needed by one-third , compared to conventional elevators .
In addition to freeing useful space , the TWIN system reduces the required building materials for shafts , and hence reduces costs . There is also one control machine for both elevators in the same shaft , leading to additional savings in space and energy . Through a computerised system , it also optimises the travel of both cabins in assigning the most efficient destinations for passengers , providing efficient service that minimises wait time and provides fewer stops and empty trips . This leads to additional energy savings . TWIN cars can travel up in the shaft up to 7 m / s ( 23 ft / s ) and travel down about 4 m / s ( 13 ft / s ). When the TWIN system is applied , it is often mixed with non- TWIN lifts . The latter serves passengers who want to travel directly , for example , from the lowest floor to the top floor and vice versa [ 34 ].
Double Deck Elevators Double Deck elevators are two cabs tall , where one cab serves even-numbered floors and the other serves odd-numbered floors , reducing the total number of needed elevators . Double Deck elevators can reduce a building ’ s overall energy usage by reducing the number of stops and even the total number of elevators required when used with destination dispatch controls .
20 VOL 94 APRIL-JUNE 2023