بهینه سازی دوره تولید یخ برای سیستم ذخیره سازی یخ با یخ ساز ورقه ای

Ice storage system can be used to shift electrical load from on-peak hours to off-peak hours, which can bring mutual benefits to power supplier and consumers. But if it does not operate properly the economic benefit will not be achieved. There is an ice storage system with flake ice maker that have been installed in Donghua University. In this paper, the characteristics of phase-change heat transfer of flake ice maker is studied. According to the different temperature of water washing the plate of evaporator and air conditioning load characteristic, the operation parameters are optimized. The optimized operation strategy of this ice storage system is presented according to its heat transfer characteristic.

With the development of economy of China, the consumption of electricity improves greater and greater, and the peak load and the peak to valley ratio have both been increasing fast. For example, the consumption of electricity of Shanghai city is shown in Fig. 1, Ref. [1], the peak load has reached more than 1000MW and the peak to valley ratio has exceeded 60%. According to the latest data from Shanghai municipal electric power company, the last year’s maximum load of Shanghai is 19,543MW and this year is up to 21,208 MW. More than 40% of the consumption of electricity of Shanghai city is due to the utility of air condition, and this ratio is below the number of developed countries above 60% [2]. So the consumption of electricity and the electric power shortage due to air condition will become more seriously in future. The ice storage air condition (ISAC) system has been used more and more due to its super capability for peak load shifting and leveling, which can bring mutual benefits to power supplier and consumers.

The district cooling plant with ice storage is suitable for the customers with high cooling density and great peak to valley ration for its high efficiency and economic benefits. However, reasonable operating parameters and optimized operation strategy is very important, otherwise the benefitswill not be achieved. In this paper, the characteristic of heat transfer of flake ice maker is studied and the optimum time of dumping ice layer with different temperature ofwashingwater is achieved. After the optimization, the cool energy released is improved about 40%. But there some influent factors, such as the coefficient of heat convection and the intensification of heat transfer of the plate of evaporator, should be studied further.