Elevator Regenerative Function Systems towards Green Building

Abstract

The Elevator Regenerative Function System is an energy-saving technology that converts kinetic and potential energy generated during elevator movement into electrical power for building recirculation, aligning with green building standards. This study analyzes the energy consumption and generation of passenger elevators to determine the Maximum Allowable Incremental Cost (MAIC), serving as an economic benchmark for investment decisions. Two office building models—a 15-story mid-rise and a 25-story high-rise equipped with gearless traction elevators—were utilized as case studies. Results indicate that during peak traffic periods, the mid-rise model achieved an energy recovery proportion of 108.1% relative to its motoring energy consumption, surpassing the 46.2% recorded for the high-rise model. However, in terms of absolute daily cumulative energy recovered, building height and higher traffic volume were key factors allowing the high-rise model to return more electricity to the building grid. Consequently, the economic evaluation via MAIC demonstrates that high-rise buildings possess greater investment potential and higher budget ceilings. A sensitivity analysis regarding occupancy density, building height, and electricity tariffs was also conducted to support decision-making.