| 摘要: |
| 本文基于三水合醋酸钠，搭建了一套相变蓄热水箱实验系统，在初始水温为80 ℃、进水温度为5 ℃的工况下，测试得到了水箱的热力学特性，并采用填充效率分析法以及?效率分析法，在进水流量分别为1、3、5、7、9 L/min时，分析了相变蓄热水箱的热分层特性。结果表明，当水箱温度为80 ℃时，普通水箱、PCM48、PCM58的热能分别为18.81、19.34、19.07 MJ。进口体积流量相同时，相变蓄热球越靠近水箱进口，水箱的热分层效果越好。随着进水体积流量的增大，分层效果下降。不同水箱的Ri数在t*=0.5达到最大值，Ri数随相变蓄热球位置的降低而减小，PCM48和PCM58在第四层时的Ri数分别为7.569和7.781，而在第一层时的Ri数分别减小为7.03和7.145，表明水箱热分层的程度随着相变蓄热球位置的升高而降低。 |
| 关键词: 温度分层 相变 蓄热水箱 填充效率 |
| DOI： |
| 投稿时间：2018-12-14 修订日期：2019-03-22
|
| 基金项目:国家自然科学基金青年项目（51606126）和上海市地方高校能力建设项目（18060502600）资助。 |
|
| Experimental Study on Stratification Characteristics of the Phase Change of a Hot Water Tank |
| Zhou Liqiang,Zhang Hua,Wang Zilong,Liu Zhanjie |
| (School of Energy and Power Engineering, University of Shanghai for Science and Technology;Qingdao Haier Biomedical Co., Ltd.) |
| Abstract: |
| A hot water tank test bench with phase change material (PCM) of sodium acetate trihydrate was built. The thermodynamic characteristics of the water tank were tested under the conditions of an initial water temperature of 80 °C and an inlet water temperature of 5 °C. The analytical method and the enthalpy efficiency analysis method were used to analyze the thermal stratification characteristics of the hot water storage tank with PCM when the influent flow rates were 1 L/min, 3 L/min, 5 L/min, 7 L/min, and 9 L/min, respectively. The experimental results show that when the water tank temperature was 80 ° C, the energy of the ordinary water tanks, PCM48 and PCM58, were 18.81 MJ, 19.34 MJ, and 19.07 MJ, respectively. When the inlet flow rate was the same, the closer the heat storage ball with PCM is to the water tank inlet, the better the heat stratification effect of the water tank. As the influent flow rate increased, the stratification effect decreased. The number of Ri in different water tanks reached a maximum at t*=0.5; the number of Ri decreased with the lower position of the heat storage ball with PCM. The Ri number of the PCM48 and PCM58 in the fourth layer were 7.569 and 7.78, respectively. The Ri numbers at the layer were reduced to 7.03 and 7.145, respectively, indicating that the degree of thermal stratification of the tank decreased with the higher position of the heat storage ball with PCM. |
| Key words: temperature stratification phase change hot water storage tank filling efficiency |
