Central air conditioning frequency energy-saving cabinet

Central air conditioning frequency energy-saving cabinet Dr. Paul Smart Saver, a German company to introduce sophisticated mature intelligent power control technology, combined with the world's most high-frequency technology features, and domestic application characteristics, developed a series of new ideas high performance. Under the premise of improving the stability increases simple PLC, PID practical section, flexible input and output terminals, online parameters setting, self-identification signal transmission failures, power outages and downtime parameter storage, electrical energy control, traverse control, RS485 control, Fieldbus control and a series of practical operation of advanced control functions. Equipment manufacturers and end customers to provide highly integrated integrated solutions to reduce system acquisition and operating costs, improve system reliability is of great help. 1, central air conditioning system power of the status quo? In general, the maximum load capacity of the central air conditioning system in accordance with the hottest, biggest load conditions to design, there is a considerable amount off, but in fact very few of these systems Working under extreme conditions, according to the statistics, 95% of the time air-conditioning equipment running at 70% load or less volatility, so the actual load can not reach full capacity, especially under the air conditioning demand is small, low host load, in order to ensure better operational status and higher operating efficiency, the host can load changes in a certain range of loading or unloading, but with the support of the cooling water pump and chilled water pumps are still running at a high load state, it will bring ? the following series of questions: l excessive flow cold water system reduces the temperature difference between supply and return, deteriorating working conditions hosts, cause a decline in host heat exchange efficiency, energy wasted; l pump pressure, usually through? pipe valve opening adjustment to adjust the cooling water and chilled water flow, so there is a lot of energy loss on the valve. As the central air conditioning cooling water, chilled water systems and low operating efficiency, greater energy consumption and is owned by the long-running, energy-saving technological transformation is absolutely necessary. 2. Central air regulator freeze / coolant pump speed saving principle AC variable frequency technology to control operation of refrigeration / cooling pumps, central air-conditioning system is one effective way of energy saving. Pump load power and speed is proportional to the third power, namely PαN3, where P is power, N is speed; visible with frequency control methods to reduce the economic pump flow is very significant, as required flow is reduced, the pump speed is reduced, the power required by its decrease in motor speed cubed. : A. All ? When the pump flow decreased by 10% (trace output frequency is 45Hz) the motor shaft power P '= (0.9) 3P = 0.729P ???? namely saving rate of 27.1% B. ?? When the pump flow decreased by 30% (Tracking The output frequency is 35Hz) the motor shaft power P '= (0.7) 3P = 0.343P ???? namely saving rate 65.7% decline when the chiller load, the required water flow is reduced by reducing the motor speed control device the pump speed to reduce the water flow, a corresponding reduction in the pump shaft power, the motor input power is also reduced. Increase when cold, cold machine load increases, the condenser inlet and outlet water temperature difference increases, operating frequency converter increases the pump speed to accelerate, the water flow increases, thereby maintaining a constant temperature difference. Vice versa. To achieve the desired energy savings. 3, energy-saving control principle: Dr. Paul Frequency central controller and temperature sensor module temperature refrigeration / cooling pump return water temperature and the water temperature is read into memory, and calculates the temperature difference; then according to the temperature difference to control frequency the speed, adjust the water flow, control the speed of the heat exchanger; the temperature difference, indicating indoor temperature is high, should improve the freeze / coolant pump speed, accelerate the freeze / cooling water circulation rate and flow speed of the heat exchanger; conversely the temperature difference is small, then the indoor temperature is low, can reduce refrigeration / cooling pump speed, slow freezing / cooling water circulation speed and flow, slow down heat exchange to conserve power; inverter start, stop, change the operating frequency, and Monitor display data such as inverter output power, the output frequency, output current, output voltage is achieved by the frequency central controller via 485 communication protocol. ? 4, energy-saving equipment features l Frequency system using optimum excitation control mode, optimum excitation current adjusted so that the motor efficiency has been greatly improved even more, to achieve further energy efficient;? L equipped with touch-screen user? interface, operation control simple, intuitive display various data;? l equipped with a programmable controller, RS485 communication module, saving / bypass automatic switch, easy to operate;? l built instantaneous power failure restart function and try to start function, unattended, fully automated operation; l for the pump to achieve soft stop and soft start, can completely eliminate water hammer effect NM;?? l can always adjust the pressure in the pipeline, to ensure that the proper range; l ? Run reasonable, motors, pumps, will greatly enhance the service life of the coupling; l freezing and cooling pump energy-saving rate of more than 20%, even up to 60% 5. Application:?? all kinds of central air-conditioning refrigeration pump , cooling pumps, cooling tower fans, air fans and the like;