摘要
设计并搭建了带内回热的有机朗肯循环实验台,以R123作为循环工质,对内回热、无回热两种循环形式进行了实验研究,实验结果显示,内回热、无回热循环在热源温度为100℃时的最大输出功率均为510 W左右,膨胀机绝热效率分别为79.76%与69.21%;内回热循环效率比无回热循环高提高1.21%。以内回热有机朗肯循环为基本形式,对影响循环性能的4个主要因素:工质充灌量、工质流量、蒸发温度、冷凝温度进行了实验研究。实验结果表明,存在一个最佳充灌量(14.19 kg)使得循环具有最大输出功率;在不同的工质流量下,大负载下工质高流量输出性能好,而小负载下工质低流量输出性能好;随蒸发温度的升高,蒸发温度变化对循环输出功率的影响变小;冷凝温度对循环运行的稳定性影响不大。
In this work, an organic Rankine cycle （ORC） with internal heat regeneration （referring to regenerative ORC） is designed and built, which uses refrigerant R123 as working fluid. Based on this experimental system, we test the performances of the ORCs with and without internal heat regeneration at different operating conditions. The result shows that when the heat source temperature is 100℃, the cycle efficiency are, respectively, 5.98% and 4.71% for the RORC and ORC although the output powers of both cycles are nearly the same which is about 510 W. The influences of four key parameters including the refrigerant charge, refrigerant flow, evaporating temperature and condensing temperature on the cycle performance are experimentally explored. It is indicated that there exists an optimal refrigerant charge of about 14.19 kg to result in the maximum output power. In addition, it is found that under the high torque, increasing the working fluid flow rate leads to the increase in the cycle performance. Under the low torque, however, lowering the flow rate can result in the increase in the cycle performance. Further, it is shown that .the output performance of the system is increased with increasing the evaporating temperature. However, it is noticed that as the evaporating temperature rises, the influence of evaporating temperature on the output power fades out. Condensing temperature has no significant effect on the stability of the system.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2013年第2期205-210,共6页
Journal of Engineering Thermophysics
基金
国家自然科学基金项目(No.50736005
No.51176155)
关键词
有机朗肯循环
内回热
循环性能
organic rankine cycle
internal heat regeneration
cycle performance
