基于CFD的区域供冷外融冰系统完全融冰后利用蓄冰池低温冷水供冷方式模拟研究
CFD-based simulation study on cooling methods using low-temperature chilled water from ice storage tanks after complete ice melting in district cooling external ice melting systems
摘要：
盘管外融冰系统因具有换热效果好、出水温度低、释冷速度快、融冰能耗小等优点,被广泛应用在区域供冷系统中。然而系统融冰释冷结束后蓄冰池内还存在大量的低温(约1.5 ℃)冷水无法继续供冷。本文提出了一种通过改变常规盘管外融冰蓄冰池结构以充分挖掘融冰后蓄冰池内低温冷水供冷潜力的方法,并以深圳某区域集中供冷站为例,采用CFD方法进行了供冷效果的模拟分析。研究结果表明,通过设计蓄冰池分隔墙及过流孔,能够延长蓄冰池出水温度保持在低温状态的时长,从而充分挖掘释冷后蓄冰池的供冷潜力,提高供冷系统的能效比。
Abstract：
External melt ice-on-coil systems are widely used in district cooling systems due to their advantages of excellent heat transfer ability, low outlet water temperature, rapid cooling release speed and low energy consumption of ice melting. However, after the ice-melting and cooling release process, there is still a large amount of low-temperature chilled water remaining around 1.5 ℃ in the ice storage tank, which cannot continue to be used for cooling. This paper proposes a method to fully exploit the cooling potential of the low-temperature chilled water remaining in the ice storage tanks after ice melting by modifying the conventional structure of external melt ice-on-coil storage tanks. Taking a district cooling station in Shenzhen as a case study, this paper employs the CFD method to simulate and analyse the cooling ability. The study results show that designing partition walls and overflow holes in the ice storage tank can extend the duration of maintaining the outlet water temperature at a low level, thereby fully exploiting the cooling potential of the post-discharging ice storage tank and improving the energy efficiency ratio (EER) of the cooling system.
Keywords:district cooling; external melt ice-on-coil; water distributor; overflow hole; low-temperature chilled water; numerical simulation