Comparison of Long-Term Energy Measurements of Elevator Systems with ISO 25745

This paper compares long-term measurements of elevator systems to determine energy consumption with the estimation method of the ISO25745-2 standard. Five elevator systems with more than 240,000 elevator trips were measured and evaluated. In order to assess the deviations between the results of the ISO25745-2 estimation method and the long-term measurements, the main parameters of the estimation according to the standard are described. The study showed that for three elevator systems there was a small deviation between the estimates and the measurements, while for two systems there was a larger deviation. As a result, the energy consumption was estimated to be up to $79 \%$ higher than measured. The paper investigates the reasons for the discrepancy between the estimated and measured energy consumption according to ISO25745-2 and shows how to improve the estimation of energy consumption. The individual usage profile of the elevator system with the average travel distance and usage time per day is of particular importance. The study concludes that a calculation of energy consumption according to ISO25745-2 only provides reliable data if the individual usage profile is accurately taken into account. If this is not the case, the results can deviate significantly from reality. Suggestions are made to objectify the estimation method.