1、 Project Background
There are 120 elevators in a certain park in Guangdong Province, of which 75 elevators have undergone energy-saving renovation (high-speed and low-speed elevators are not included in energy-saving renovation). The energy-saving renovation elevators include multiple brands (Mitsubishi, Hitachi, Toshiba, Xunda, etc.). Before the implementation of the renovation in 2023, the annual power consumption of the elevator system accounted for 20% of the total energy consumption of the park, and the daily average power consumption of a single elevator reached 90 kW · h.
2、 Core parameters of technical solution
Basic Configuration
O Adopting PFE 9th generation energy feedback device (Canadian technology)
Rated power: 15KW-27kW
O Harmonic distortion rate of power grid: 2% (measured value)
Scene adaptation design
Electromagnetic compatibility: Optimize LC filtering to effectively suppress harmonics and electromagnetic interference, with voltage and current THD ≤ 2%, ensuring feedback of clean electrical energy;
O Meet the national standard for elevator energy feedback devices: Upgrade the new generation of control software and hardware, and pass the GB/T 32271-2015 "Elevator Energy Feedback Devices" and TSG T7007-2022 "Elevator Type Test Rules" tests;
Temperature control: The braking resistor does not intervene in the operation and maintains room temperature (around 140 ℃ before the modification)
4、 Key points of technical implementation
Security redundancy design
Retain the original braking resistor as a safety redundancy
Dual current detection (error<0.5%)
Energy efficiency verification method
O Adopt the testing procedures in Appendix C of GB/T 10058-2023 "Technical Conditions for Elevators"
Continuous 30 day comparative monitoring (excluding the impact of passenger flow fluctuations)
Non energy saving benefits
The estimated lifespan of the frequency converter has been extended by 2.8 times (calculated based on the temperature accelerated aging model)
The noise level during elevator operation has decreased from 65dB to 52dB
5、 Economic Benefit Analysis
Direct income
Annual energy savings: 739000 kWh (75 units in the project)
Electricity cost savings: 616400 yuan (implementing commercial and industrial electricity prices of 0.834 yuan/kWh)
Hidden cost savings
Extended maintenance cycle and 37% reduction in labor costs
O Computer room temperature: reduced from 42 ℃ to 37 ℃, reducing 25 computer room air conditioners (saving 127900 yuan in annual electricity bills)
