Beijing Yintai Center is located at the southwest corner of the International Trade Bridge on the East Third Ring of the CBD. It is designed by a world-renowned architect and is a landmark building on Chang'an Avenue in the new century. The total construction area of the project is 350,000 square meters, and the main building is 249.9 meters high. It includes the super five-star hotel Park Hyatt, super luxury Park Hyatt apartments and top hotel serviced apartments invested and managed by Hyatt International Hotel Management Group. In the traditional central air-conditioning system, the control of fans and pumps usually uses the opening of baffles and valves to adjust the flow, so as to achieve the effect of adjusting the indoor temperature. According to the relevant electrical person in charge, although the investment cost of adopting this type of control is low, the operation effect is not satisfactory. The main points are as follows:
-Serious waste of electric energy and high electricity bill -The indoor temperature difference changes greatly, and the comfort cannot meet customer requirements -High failure rate of equipment, frequent maintenance and high maintenance costs
System Configuration: The central air-conditioning system is mainly composed of heating system, ventilation system and cooling system. Yintai Center has an exhaust system on each floor, as well as 18 cooling tower fans and pumps, and 3 central auxiliary cooling tower fans that operate 24 hours a day. In order to achieve precise control and energy-saving effects, the fresh air unit and cooling tower fans and pumps are all controlled by ABB frequency converters. The product model is ACS510, and the power is 18.5kW and 45kW, totaling about 180 units. Inverter control can adopt two control methods, local and remote. Among them, remote control can directly communicate with the host computer through the built-in MODBUS field bus of the inverter. ACS510 is ABB's standard drive product, which is specially optimized for fans and pump loads. The built-in PFC macro (fan pump control macro) and SPFC macro (cycle soft start macro) are equivalent to installing a small PLC can realize the control of up to 7 motors by one inverter, which reduces the initial cost, reduces the external wiring, runs reliably, and has a low failure rate. In addition, the built-in variable-inductance DC reactor or AC reactor with patented technology can significantly reduce the harmonic content of the grid-side current and voltage, the harmonic current distortion rate is 35%, the harmonic voltage distortion rate is 4%, and the power grid is improved. Transient immunity. A large number of built-in EMC filter circuits are the Standard EN61800-3 reduces the interference of electromagnetic radiation on electrical equipment in buildings. According to the person in charge of the Yintai Center’s electrical system, ABB frequency converters and building automation systems can achieve a perfect combination, which greatly reduces equipment failure rates, significantly reduces maintenance rates, and achieves the highest system operating efficiency. At the same time, the realization of centralized control makes the operation simpler and easier to control. More importantly, calculations based on operating data show that the annual power saving rate can reach about 30%, and the potential for power saving is huge.
Solved problem: -Huge energy-saving space, the power-saving rate can reach about 30% -High accuracy of indoor temperature and humidity control, strong environmental comfort -High system integration, simple and easy control, reliable operation -Low failure rate and greatly reduced overhaul intensity
Benefit:
-The energy-saving effect is obvious, and the power-saving rate can reach about 30% -The system is stable and reliable, the control precision is high, and the environment is comfortable -Flexible system operation, high efficiency in operation and maintenance -Built-in input reactor and EMC filter, low harmonic content, less electromagnetic radiation, low system noise
