不同进水方式对大型水体储热效率的影响

The Influence of Different Inlet Methods on the Heat Storage Efficiency of Large Water Bodies

目的针对大型水体跨季节储热时间不匹配问题,分析不同进水方式对储热效率的影响,减少储热过程中的热量损失。方法利用CFD数值模拟软件建立水体储热的分析模型,研究水体储热过程中的热交换规律,以及单双进水口、水平间距、动态进水、流速等因素对水体储热效果的影响。结果进水总流量越小,内部水体温度分层越好;在相同的储热时间内,双进水口方式效率最佳,水体内部平均温度至少比单一进水和动态进水高出16.83%,储热效率分别提高了9.89%和16.14%;相比单一进水口,双进水口方式火用损失降低了21.97%;进水管之间距离越小,水体储热效率越高。结论进水方式对水体储热效率影响至关重要,进水管道越靠近中轴线,采用小流量、双开口的进水形式储热效率越好。

Regarding the problem of mismatched cross seasonal heat storage time in large water bodies,in this paper the impact of different inflow methods on heat storage efficiency was analyzed to reduce the heat loss during the heat storage process.An model for water thermal storage analysis was established by CFD numerical simulation software.The heat exchange law during water thermal storage process was analyzed,and the influencing factors such as single and double inlet,horizontal spacing,dynamic inflow,and flow velocity on water thermal storage efficiency were discussed.The research results showed that the smaller the total inflow rate,the better the temperature stratification inside the water body.Within the same heat storage time,the heat storage efficiency with the dual inlet method had better than that of single inlet and dynamic inlet,and the average temperature inside the water body high at least 16.83%,and the heat storage efficiency being increased by 9.89%and 16.14%respectively.Compared to the single inlet,the exergy loss with the double inlet method was reduced by 21.97%.And the smaller the distance between the inlet pipes,the higher the heat storage efficiency of the water body.So the water inlet method has a crucial impact on the thermal storage efficiency of water bodies.The closer the inlet pipeline is to the central axis,the better the thermal storage efficiency can be achieved by using a small flow rate and double inlet form.