区域供冷系统盘管外融冰水池释冷特性实验研究
Experimental study on cooling discharging characteristics of external melt ice-on-coil tanks in district cooling systems
摘要：
盘管外融冰式冰蓄冷系统因其技术稳定、瞬时融冰释冷速率快、取冷温度低、融冰能耗小的特性常被设置于大型区域供冷系统中,以提升区域供冷系统对电网的“削峰填谷”能力并降低运行费用。但其融冰释冷过程受蓄冰水池内流场、温度场及进口水温、流量等的影响较为复杂,理论求解较为困难。本文以深圳市前海区域供冷系统2号制冷站255 MW·h的全尺寸蓄冰水池为研究对象,分别在供冷初期及供冷高峰期开展了释冷特性和温度场变化特性的实验研究。结果表明,在供冷初期及供冷高峰期蓄冰水池出水温度与累计取冷率均呈三次幂关系,为盘管外融冰系统设计及工程应用提供了数据支撑。
Abstract：
External melt ice-on-coil thermal storage systems are usually used in large-scale district cooling systems (DCS) with advantages of technical stability, high instantaneous ice melting rate, low cooling temperature and low energy consumption of ice melting, which are good for the peak-shaving and valley-filling to the grid and the operation cost reduction. However, the ice melting and cooling discharging process is complex due to the water flow field, water temperature distribution, and inlet water temperature and flow rate, so the theoretical solution is more difficult to obtain. In this paper, the full-size ice storage tank of 255 MWh in the No.2 Plant of Qianhai DCS is studied, and the experimental research on the ice storage tank’s cooling discharging characteristics and temperature field changes is carried out in the early and peak cooling periods, respectively. The results show that there is a cubic relationship between the ice storage tank’s outlet temperature and the cumulative cooling discharging rate in the early and peak cooling periods. The findings of this study lend support to the design and engineering applications of external melt ice-on-coil systems.
Keywords:district cooling system; external melt ice-on-coil; cooling discharging characteristic; temperature distribution; experimental study