The energy required for daily operation of a building has the biggest impact on the environment - the same applies to elevators. The amount of energy an elevator consumes while in service is crucial to determining its environmental impact. Schindler employs the VDI 4707 guidelines to provide accurate and relevant energy consumption information for its products.
The VDI 4707 guidelines has been published by the Association of German Engineers (VDI). Although this is an independent organization and as such, their standards are voluntary, the VDI 4707 is an accepted key standard in the market. Purchasers prefer a single figure to rate the energy efficiency of products. However, an elevator uses both operational energy and standby energy. In the commodity market, where usage is relatively low, the standby energy can account for as much as 80% of the total energy used, whereas in elevators that are in frequent use the drive system is responsible for a major proportion of the energy used.
The VDI 4707 guidelines lists different usage categories. Standby energy and operational energy are weighted depending on the way in which the elevator is used, in order to come up with a single figure. Once this figure has been obtained, it is possible to assign an energy efficiency class from A to G.