Elevator Traffic Interval
Calculate the traffic interval (average waiting time) of an elevator group, INT = RTT ÷ N, dividing the round trip time RTT (s) by the number of elevators N in the group. The result, in seconds, is the average time between elevator arrivals at the main floor — the main service-quality indicator perceived by users (waiting time). Intervals up to 30 s are excellent; above 50-60 s, poor. More elevators in the group reduce the interval. It is the key criterion in sizing the number of elevators. Enter the RTT and the number of elevators.
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Intervalo de tráfego
O intervalo de tráfego é o que o usuário realmente sente: o tempo médio de espera por um elevador. Para um grupo de N elevadores trabalhando juntos, INT = RTT ÷ N, o tempo de viagem redondo dividido pelo número de elevadores. A lógica: se um elevador completa um ciclo a cada RTT segundos, e há N deles distribuídos uniformemente no ciclo, então chega um elevador ao térreo a cada RTT/N segundos — esse é o intervalo médio entre chegadas, e portanto a espera média (a espera máxima é o próprio intervalo; a média percebida, cerca de metade). O intervalo é o principal indicador de qualidade de serviço de um sistema de elevadores, com faixas bem estabelecidas: intervalos de até ~30 s são considerados excelentes (escritórios de alto padrão); 30-40 s, bons; 40-50 s, regulares; acima de 50-60 s, ruins (usuários ficam impacientes, reclamam, usam escadas). É o critério decisivo no dimensionamento do número de elevadores: adiciona-se elevadores ao grupo até o intervalo cair à faixa aceitável para o uso do edifício. Há um equilíbrio econômico — mais elevadores melhoram o serviço mas custam caro (poço, máquinas, área nobre perdida). Algoritmos modernos de despacho de destino (o usuário informa o andar na botoeira do hall) agrupam passageiros e reduzem o RTT, melhorando o intervalo sem adicionar elevadores. Informe o RTT e o número de elevadores.
Related Tools
Number of Elevators Required
Calculate the number of elevators required, N = peak demand ÷ capacity per elevator, dividing the peak transport demand (people in 5 min) by the handling capacity of a single elevator (people in 5 min). The result is the minimum number of elevators in the group to meet peak demand. In practice, round up and also check the resulting traffic interval (waiting quality). Peak demand comes from the building population times the peak percentage (12-15% in offices). Undersizing causes queues and long waits. Enter the peak demand and the capacity per elevator.
Round Trip Time (RTT)
Estimate an elevator's round trip time (RTT), RTT = 2·(H ÷ v) + stops × t_stop, from the travel height H (m), the speed v (m/s), the number of probable stops and the average time per stop (s, including deceleration, door opening/closing and boarding). The result, in seconds, is the time of a complete up-and-down cycle with stops — a central parameter of vertical traffic analysis. The higher the RTT, the lower the handling capacity and the longer the interval between cars. Enter the height, the speed, the number of stops and the time per stop.
Handling Capacity (5 min)
Calculate an elevator's handling capacity over 5 minutes, HC = (300 × Q) ÷ RTT, from the car capacity Q (people) and the round trip time RTT (s). The result, in people carried per 5 minutes, is the standard vertical-traffic performance metric (building peak demand is usually measured over 5 min). The factor 300 is the seconds in 5 minutes. Multiplied by the number of elevators and compared with the building population, it tells whether the system meets demand (typically 12-15% of the population in 5 min in offices). Enter the car capacity and the RTT.
The results provided by this tool are for general informational and educational purposes only and do not constitute professional, financial, medical, legal, tax or accounting advice. Always confirm important decisions with a qualified professional and official sources.