The Study Of Intelligent Operation And Energy Management Of The Ice Thermal Storage System

According to the features of peak load shifting on ice thermal storage, combining the changes of air-conditioning load and the capability of digital information processing on the basis of electronic technology, the intelligent control system achieves the integrated surveillance and centralized management of ice thermal storage system by using information technologies as computer and internet, etc. Additionally, the intelligent control system can control the operation system remotely in real time. overall, the energy management has been developed by using intelligent control system into ice thermal storage system substantially.The intelligent control system collects the data by using the sensors which are placed on the key points of ice-storage system connecting with CPU. The data includes dry-bulb temperature of outdoor air, outdoor relative humidity, ethylene glycol solution’s inlet/outlet temperature of heat exchanger and ice-storage tank, flow volume of ethylene glycol solution, water’s inlet/outlet temperature of heat exchanger, water’s flow rate, ice’s volume, ethylene glycol solution’s inlet/outlet temperature of refrigerator, water’s inlet/outlet temperature of refrigerator, water’s supply/return pressure, etc. So the variation of the data can be collected and processed in real-time.The logical operation system controls the subsystems by integrating the control logic of relative subsystems, such as time control, process control, interlock control, equipment on/off schedules control, refrigerator’s operation mode control, ice-making control, constant temperature of ice-melting control, water’s constant outlet temperature of heat exchanger control, refrigerator’s energy control, frequency of the circulating water pump based on the pressure drop control, frequency of the ethylene glycol pump based on the temperature difference control, and frequency of the cooling water pump based on the temperature difference control.The intelligent control system integrates and analyzes the data link which comes from a data base established based on a series data models, such as " the all-day air-conditioning load which is calculated according to the actual temperature of day ", " the actual air-conditioning load of the day before "," the all-day air-conditioning load which is calculated on the basis of load coefficient" and " load coefficient" etc. the operation strategy of the next hour can be predicted and adjusted on every hour by operating status of this hour At the end of each day, the operation strategy of next day can be predicted and adjusted by the operating status of this day. Thereby, the intelligent control system can optimize the operating status of system.By using the intelligent control system, the operation strategy of ice thermal storage system can be adjusted according to the variation of air-conditioning load in real-time. The electronic energy can be used more reasonably and economically by scientifically and high efficiently controlling the rate of ice-melting. Not only low cost management without monitoringcan be realized, but also the efficiency of energy distribution can be improved.Intelligent operating ice thermal storage system not only improves the traditional management mode of refrigeration station, but also develops the traditional industrial products property from "mechanical or electronic" to "intelligent". Thus, the traditional industrial manufacturing has been upgraded in the intelligent manufacturing as the leading of new round industrial revolution 4.0.