Optimal Operation Of Ice Harvester System Based On Weekly Circular Running Strategy

In recent years, the energy problem has already become a world problem, and attracts all over the world more and more attentions. Power requirement in the big and medium scale cities is increasing greatly, and the electricity supply lacks tightly. Thermal storage air-conditioning is an important approach to shift electric demand from on-peak electric rate periods to off-peak periods, and also is an important direction of developing modern air conditioning system. There are important theoretical value and practical significance for thermal storage air-conditioning by experimental research and technical economic analysis. As a new kind of ice-storage system, the dynamic ice-storage system conquered many disadvantages of the traditional static ice-storage system, which has a wider developmental space.Efficient running mode is the key of the saving running costs and energy for ice-storage system. The major work of this thesis is to study the optimal operation based on weekly circular running strategy from a project example. The operation mode combines ice harvester system and optimal operation system based on weekly circular running strategy, meets the requirements of the air conditioning load by the way of keeping the refrigerating engine efficient working and variable ice-melting rate .Control the time and quantity of the refrigerating engine to be turned on properly. So, what has being said above can ensure refrigerating engine running efficiently, and the avoid being impacted by the change of air conditioning load, and achieve the purpose of saving running costs, reducing energy consumption and refrigerating engine running efficiently. All of the national, electricity industry and the users can win the benefit.To be the lowest running costs as control objective, establish optimal control model based on weekly circular running strategy based on weekly cooling load,COP,running cost and the characters of ice harvester system. According to the control objectives,the objective function,constraints and COP, establish specific control strategy for the ice harvester system in Donghua University Songjiang Campus.The control strategy of optimal operation based on weekly circular running is quite complex, so develop the optimal control computer program by using the object orientation program design technology and Visual Basic language and adopting waterfall model in Windows environment, in this thesis. The interface of computer program is friendly and we can use it easily The user is only familiar with the simple basic operation without understanding the whole process of control strategy. The computer program can control the main refrigeration equipment, and achieve the purpose of reducing energy consumption, raising energy efficiency and saving running costs.The ice harvester dynamic storage system in China is still a relatively new type of storage system, and there are many advantages for this system, such as fast ice-melting, simple ice storage devices, operating efficiency and the non-use of ethylene glycol so on. In this paper, after doing much research and analyze on the economic of ice harvester system, establish initial investment calculation model, running cost calculation model and economic evaluation model. According to the economic analysis model, develop economic analysis computer program.According to analyzing the cooling load of the whole year that is fitted by cooling load continue characteristic model, it is concluded: under the control of optimal operation based on weekly circular running strategy, running cost decreases significantly. Comparing to the strategy of chiller priority, the running cost of the weekly circular running strategy falls 21.3%, and whose quantity of the ice-melting for cooling is 1.7 times than strategy of chiller priority. It shows the advantage of this dynamic storage system greatly.