Benchmarking by Simulations

摘要

Energy efficiency of lift systems is of major concern due to the global demand for sustainable development. At present, there are international and national standards on energy efficiency of lift systems but the availability of one parameter that can master both motor drive efficiency and traffic control is limited. Thirteen years ago, the concept of with a unit J/kgm was proposed by the author. It was included in the Technical Guide of the Building Energy Code of Hong Kong SAR 2012 and 2015. However, due to technical and commercial difficulties, the number of systems with this parameter equipped is limited. It is therefore difficult to provide a solid figure of it for the purpose of benchmarking. In this article, significance and application of this parameter, method to monitor this parameter and results of different types of simulations, including different drive types, different traffic patterns, and different supervisory control methodologies, are reported. It can be shown that an acceptable system can achieve 50 J/kgm or below, a good system at around 40 J/kgm or below and an excellent system close to 30 J/kgm.