CAJ | 학술논문

提出使用浸润了导热油的砂砾作为填料，以获取更好<br>　　的斜温层单罐显热蓄热效果的思路。对Xceltherm 600型导热油与沙砾混合物在不同入口温度和流速下的蓄热特性进行研究。建立了间接接触式显热蓄热实验台，选用空气作为换热流体，流经钢管内部形成的通道换热，钢管外部与罐体内的蓄热混合物紧密接触。结果表明，与纯沙砾蓄热材料相比，导热油与沙砾混合物的蓄热效率能够提高18.5个百分点，且蓄热介质内部沿径向温度梯度更小，斜温层轴向温度梯度更大。不同的空气入口温度(328.15~358.15K)，对于罐体蓄热性能影响不大，但实际电站运行的最优温度区间仍有待研究。流速也是影响罐体蓄热性能的重要指标，低流速下不仅蓄热效率提高，而且斜温层的温度梯度也会增大。
제출사용침윤료도열유적사력작위전료，이획취경호<br>　　적사온층단관현열축열효과적사로。대Xceltherm 600형도열유여사력혼합물재불동입구온도화류속하적축열특성진행연구。건립료간접접촉식현열축열실험태，선용공기작위환열류체，류경강관내부형성적통도환열，강관외부여관체내적축열혼합물긴밀접촉。결과표명，여순사력축열재료상비，도열유여사력혼합물적축열효솔능구제고18.5개백분점，차축열개질내부연경향온도제도경소，사온층축향온도제도경대。불동적공기입구온도(328.15~358.15K)，대우관체축열성능영향불대，단실제전참운행적최우온도구간잉유대연구。류속야시영향관체축열성능적중요지표，저류속하불부축열효솔제고，이차사온층적온도제도야회증대。
The new idea of using sand soaked with the thermal conductive oil as the filler material was proposed for better sensible heat storage in a thermocline single tank. The characteristics of thermal energy storage (TES) using the mixture of Xceltherm 600 synthetic oil and sand under various inlet temperature and velocities were investigated. An experimental setup of the TES system was built for the study. Air was used as the heat transfer fluid to flow through tubes that pass through the sand-oil mixture to store or extract heat. The outer surfaces of the airflow tubes have nice contact to oil and sand. It is found that the TES efficiency of sand-oil mixture increases by 18.5% compared to that of pure sand. In the sand-oil media, the temperature gradient along the radial direction is lower, while the temperature gradient along the axial direction is higher. Under the tested air inlet temperatures (328.15-358.15K), the TES performances show similar characteristics. For industrial power generation application, further work to optimize temperature range needs to be conducted in the future. The air velocity is also another important parameter to the TES. Lower velocity not only increases the TES efficiency, but also enlarges the thermocline temperature gradient.