Fluent软件在地表水源热泵系统温排水数值模拟中的运用

APPLICATION STUDY OF FLUENT SOFTWARE IN THERMAL DISCHARGE NUMERICAL SIMULATION OF SURFACE-WATER RESOURCE HEAT PUMP

运用Fluent软件对重庆市嘉陵江化龙桥段瑞安新天地江水水源热泵系统尾水排入受纳水域的过程进行二维数值模拟,选取Fluent中非耦合、隐式求解器对模型内的定常流动进行求解,得出受纳水域受水源热泵系统温排水影响后的温升面积和温度梯度。结果表明:在温排水流量为2.0×103 m3/h、温差为4℃的条件下,计算该水域沿水流方向温升超过1℃的最大影响距离为150.4 m,温升超过1℃的水域面积约为1 525 m2,为模拟江水面积的8.59%。选取1℃温升值作为温升带的边界控制值,并在热泵系统最大负荷工况下,根据W=Q×ΔT计算研究水域热环境容量为19.402 m3.℃/s,剩余热环境容量为17.736 m3.℃/s。根据地表水环境质量标准,该工程温排水量小于受纳水域的热承载力,不会对受纳水域生态环境造成热污染。

Fluent software was used to make two-dimensional numerical simulation on the process of the tail water discharged into the received water of the water resource heat pump of Ruian New World Area of Hualong Bridge on Jialing River in Chongqing.Through studying the steady flow process in the model by using uncoupled implicit solvers,the temperature rising area and temperature gradient of the influencing waterhead were got.The results showed that： as the flow of thermal discharge was 2.0×103 m3/h and the temperature difference was 4 ℃,the most influence distance along the flow direction was 150.4 m,moreover the water area was 1 525 m2 if temperature of the water rose 1 ℃,which was 8.59% area of the simulation river acreage.This article intercalate the boundary control value of the temperature rising area with one degree,in the condition of mostly polluted,according to the formula of W=Q×ΔT,the environmental heat capacity was 19.402 m3·℃/s,furthermore the residual environmental heat capacity was 17.736 m3·℃/s.According to the water environment quality standard,the capacity of the thermal discharge was under the received water,and there was no thermal pollution to the ecological environment of the received water.