一种承压太阳能储热水箱放水特性的试验与数值模拟分析

摘要

Objective] The discharge characteristics of a pressurized solar heat storage water tank under three different inlet velocities were stud-ied.[Method] Using experimental and numerical simulation methods, discharge characteristics of a pressurized solar heat storage water tank were analyzed.[Result] The temperature of the discharged water undergoes three stages: stable high-temperature stage, rapid decrease stage and stable low temperature stage.The time durations of these stages were related with the inlet velocity.Discharge efficiency of the heat storage water tank decreased with the increase of inlet velocity.It was found that the discharge curves and discharge efficiency between numerical simulation and experiment were basically same.[Conclusion] The study can provide scientific theoretical guidance for the project of solar water heaters and quality inspection standards.%[目的]研究在入口水温不变、3种不同入口流量下的一种承压太阳能储热水箱的放水特征。[方法]采用试验、数值模拟结合的方法，对承压太阳能储热水箱放水特性进行模拟分析。[结果]根据放水曲线特征可将其分为3个阶段：高温稳定阶段、温度快速下降阶段和低温稳定阶段。入口水温一定时，各阶段持续时间均与水箱入口进水速度有关，水箱放热效率随流速增大而降低，数值模拟结果的放水曲线与试验结果基本相同，放热效率也大致相同。[结论]该研究可为太阳能热水器工程及其质量检测标准提供科学的理论指导。