倾角与冷却水温度对新型闭式重力热管换热器传热性能影响

Influence of Inclination Angle and Cooling Water Temperature on the Heat Transfer Performance of a Novel Closed Gravity Heat Pipe Exchanger

本文以丙酮为工作流体,设计了一套新型重力热管换热器,该装置由五根底部连通的垂直蒸发管共用一根水平同心套管冷凝管构成。采用理论和实验相结合的研究方法,分析了装置的传热性能,并对其结构参数进行优化。研究了当倾斜角度为15°~90°、操作温度为40~80℃、冷却水温度为10~30℃时装置的传热性能。结果表明:新型重力热管换热器具有良好的等温性能及操作稳定性;当充液率为15%、倾斜角度为60°、冷却水温度为30℃时,换热器达到最佳工作状态;最大传热量可达1 700 W左右,此时平均热阻为0.042℃/W。

The heat transfer performance of a heat pipe using acetone as working fluid is experimentally studied and discussed in this pa- per. A novel heat pipe array was designed and expected to be utilized in integrated waste heat recovery equipment with higher heat transfer efficiency at lower temperature heat sources. The device is composed of five vertical evaporation sections which are connected at the bot- tom, and a horizontal concentric tube condensing section. The heat transfer performance of a new type of thermosiphon waste heat recovery unit was analyzed by theoretical and experimental methods, and the structural parameters of the device were optimized. The influence of inclination angle of 15°- 90°, operation temperature of 40 - 80 ℃ and cooling water temperature of 10 - 30 ℃ on heat transfer perform- ance of the device was studied. It is found that the new gravity heat pipe waste heat recovery device has good isothermal performance and operation stability. When the liquid filling ratio is 15% , the inclination angle is 60°, the cooling water temperature is 30 ℃, the heat ex- changer reaches the best working state. The maximum heat transfer rate is about 1 700 W, and the average thermal resistance is 0.042 %/W.