The core advantage of replacing brake resistors with elevator energy feedbacks is to convert wasted electricity into reusable resources while optimizing system performance and reducing long-term costs. Here is a specific analysis:
Energy efficient recycling
1. Energy saving
Elevator energy feedback device through power electronics technology (such as IGBT reversal) to convert the renewable electricity generated by the elevator power generation state (such as heavy load downward or light load upward) to AC electricity at the same frequency as the power grid, directly feedback to the power supply grid or other equipment in the building (such as lighting, ventilation system) use, the energy saving rate can be up to 15% -45%; The braking resistance converts electrical energy into thermal energy consumption through the resistance, causing a complete waste of energy.
Typical benefits: a single elevator saves about 3,000-6,000 degrees of electricity annually, and the annual energy savings after the national promotion are equivalent to the generation of electricity by a small wave substation (about 5.2 billion degrees).
2. Economic upgrade
Lower long-term cost: Although the initial investment of the elevator energy feedback device is higher (about 3-5 times the braking resistance), due to the recovery of electricity can significantly reduce the operating electricity bill, generally 2-3 years can recover the cost; Although the initial cost of the brake resistor is low, it needs to be replaced periodically and the long-term cost of power consumption is higher.
Reduced maintenance costs: brake resistor heating easily leads to aging, requiring frequent maintenance; Elevator energy feedback device is basically maintenance-free.
System performance optimization
1. Reduce equipment load
High temperature when the brake resistor works, long-term operation will push the elevator room temperature (additional air conditioning cooling is required), accelerate the aging of components such as frequency converters, control boards; The elevator energy feedback device eliminates the heat source, and the machine room temperature can be reduced by 5-10 ° C, extending the life of the equipment by more than 30%.
2. Improve operational stability
Elevator energy feedback device by quickly eliminating pump lift voltage (stagnant loop voltage control technology), avoid circuit fluctuations caused by braking resistance, improve elevator braking efficiency and ride comfort, while reducing dead machine failure due to overheating.
Environmental Protection and Compliance
1. Reduce carbon emissions
Recycling electricity directly reduces the total energy consumption of buildings, helping to achieve the "dual carbon" goal. For example, a single elevator reduces annual emissions of about 3-6 tons of CO2.
Compliance with Green Building Standards
Meet energy-saving requirements such as LEED certification, respond to special equipment energy-saving regulations, and improve the corporate social responsibility image.
Summary
The core value of the elevator energy feedback device is to achieve energy saving gains through energy recycling (up to 45%), improved system reliability (cooling failure reduction) and environmental compliance, especially suitable for medium-high frequency elevator scenarios. The braking resistance is only a low-cost alternative, suitable for grid limitations or temporary conversion needs.