太阳能有机朗肯循环发电系统模拟优化研究

STUDY ON SIMULATION AND OPTIMIZATION OF SOLAR ORGANIC RANKINE CYCLE POWER GENERATION SYSTEM

针对低温太阳能集热器出水温度为65~90℃的特点,根据有机朗肯循环发电原理,选取R134a、R152a、R600a、RC318、R600、R245fa共6种工质,利用EES平台进行仿真模拟和比较分析。分析结果表明:在此温度范围内,蒸发压力、蒸发温度、系统净发电功率、热电效率及系统吸热量与热源温度变化呈正比关系,且当热源温度为90℃时,RC318系统净发电功率与热电效率最高,分别为12.27 kW、15.42%。当热源温度为85℃时,RC318系统效率达到最高值82.52%。

According to the characteristics that the outlet water temperature of low temperature solar collectors is between 65℃and 90℃,this paper uses the principle of organic Rankine cycle power generation and simulates its performance by the software EES.The performance of organic Rankine cycle power generation system using six working fluids including R134a,R152a,R600a,RC318,R600,R245fa are thus analyzed and compared.The results show that in the studied temperature range,the evaporation pressure,evaporation temperature,system net power generation,electrothermal efficiency and system heat absorption are in direct proportion to the change with heat source temperature.When the heat source temperature is 90℃,the net power output and system efficiency of RC318 system are the highest,which are 12.27 kW and 15.42%.When the heat source temperature is 85℃,the exergy efficiency of RC318 system reaches the highest value which is 82.52%.