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Thermal performance behavior of a domestic hot water solar storage tank during consumption operation

机译：家用热水储水罐在运行过程中的热性能行为

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摘要

Transient thermal performance behavior of a vertical storage tank of a domestic solar water heating system with a mantle heat exchanger has been investigated numerically in the discharge/consumption mode. It is assumed that the tank is initially stratified during its previous heat storing/charging operation. During the discharging period, the city cold water is fed at the bottom of the tank and hot water is extracted from its top outlet port for consumption. Meanwhile, the collector loop is assumed to be active. The conservation equations in the axis-symmetric cylindrical co-ordinate have been used and discretised by employing the finite volume method. The low Reynolds number (LRN) k - ω model is utilized for treating turbulence in the fluid. The influence of the tank Grashof number, the incoming cold fluid Reynolds number and the size of the inlet port of the heat storage tank on the transient thermal characteristics of the tank is investigated and discussed. It is found that for higher values of Grashof number, the pre-established thermal stratification is well preserved during the discharging operation mode. It is also noticed that in order to have a tank with a proper thermal performance and or have least mixing inside the tank during the consumption period, the tank inflow Reynolds number and or its inflow port diameter should be kept below certain values. In these cases, the storage tank is enabling to provide proper amount of hot water with a proper temperature for consumption purposes.
机译：在排放/消耗模式下，已经对带有罩式热交换器的家用太阳能热水系统的垂直储水箱的瞬态热性能行为进行了数值研究。假设罐在其先前的储热/充注操作期间最初是分层的。在排放期间，城市冷水从水箱底部进水，热水从其顶部出水口抽出以供消耗。同时，假设收集器环路处于活动状态。使用了轴对称圆柱坐标系中的守恒方程，并通过有限体积法离散化了守恒方程。低雷诺数（LRN）k-ω模型用于处理流体中的湍流。研究并讨论了储罐的Grashof数，进入的冷流体雷诺数以及储热罐入口尺寸对储罐瞬态热特性的影响。已经发现，对于更高的格拉斯霍夫值，在放电操作模式期间很好地保留了预先建立的热分层。还应注意，为了使储罐具有适当的热性能和/或在消耗期间在储罐内部进行最少混合，应将储罐的流入雷诺数和/或其流入端口直径保持在一定值以下。在这些情况下，储水箱能够提供适当温度的适量热水用于消耗。

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