热力发电2025，Vol.54Issue(2)：79-87,9.DOI:10.19666/j.rlfd.202406157
负载电阻与热源温度对小型ORC发电系统性能协同影响的实验探究
An experimental investigation for the influence of load resistances and heat source temperatures on performance of small scale ORC power systems
摘要
Abstract
Organic Rankine cycle(ORC)power systems can convert low-temperature(<150℃)thermal energy into mechanical energy to generate electricity.To improve the performance of small-scale ORC power systems,an ORC test-rig was built,which has a scroll expander directly connected to the generator.With a 24 kW variable-temperature heat source and the work fluid R245fa,the effects of the variations of load resistance(50～200 Ω)and the heat source temperatures(75～95℃)on the performance of the ORC test-rig were explored.The results indicate that,both the output shaft work and the thermal efficiency initially increase and then decrease with rising the load resistance.An optimal load resistance exists to maximize either the output shaft work or thermal efficiency,and this value varies with the heat source temperature.When the heat source temperature is 95℃,the output shaft work and thermal efficiency both reach the maximum at 100 Ω load resistance value,which is 722 W and 2.30%.When the heat source temperature is 75℃,the output shaft work reaches the maximum at 200 Ω load resistance,which is 532 W,but the thermal efficiency reaches the maximum at 150 Ω load resistance,which is 1.7%.The variation of the resistive load or the heat source temperature can change the scroll expander rotation speed and thus affect system flow rate.Therefore,the simultaneous changes of the resistance load and the heat source temperature have a synergistic effect on the system performance.The results highlight the importance of matching the resistance load and the heat source temperature.The experimental data also provide a direction for optimizing the ORC power systems.关键词
有机朗肯循环/电子负载/低温热源/涡旋膨胀机/系统性能Key words
organic Rankine cycle/electronic load/low temperature heat source/scroll expander/system performance引用本文复制引用
许永超,吴玉麒,马庆旭,沙浩瀚,罗思义,左宗良..负载电阻与热源温度对小型ORC发电系统性能协同影响的实验探究[J].热力发电,2025,54(2):79-87,9.基金项目
山东省科技型中小企业创新能力提升工程项目(2023TSGC0423) Shandong Province Science and Technology-based Small and Medium-sized Enterprises Innovation Capacity Enhancement Project(2023TSGC0423) （2023TSGC0423）
