CAJ | 학술논문

为研究中低温太阳能驱动的有机朗肯循环系统的性能，设计并建造了太阳能驱动的有机朗肯循环实验台。实验中以R245fa为有机朗肯循环工质，以WD350导热油为槽式集热器循环工质，对太阳能有机朗肯循环系统进行了实验研究。实验结果表明，当太阳直射辐射强度在400 W·m?2左右时，集热器出口导热油温度可达140℃。当集热器出口导热油温度在110℃附近时，集热器集热效率可达60%左右。在该热源条件下，动力循环部分从基本循环模式切换到回热循环模式时，测算效率从9.3%提升到10.8%，实测循环效率从1.57%提升到1.67%，提升了6.07%。实测循环系统效率在10%左右，回热模式下略高于基本循环模式。实验中还考察了不同工质流量下的有机朗肯循环性能，在工质流量为6.88 kg·min?1时，得到的最大实测平均功率为386.27 W。一定热源温度下，随着工质流量的增加，膨胀机进口压力增加，循环输出功也增加；在一定的工质流量下，随着热源温度的升高，膨胀机进口的温度提高，进口压力也升高，循环输出功也增加。
위연구중저온태양능구동적유궤랑긍순배계통적성능，설계병건조료태양능구동적유궤랑긍순배실험태。실험중이R245fa위유궤랑긍순배공질，이WD350도열유위조식집열기순배공질，대태양능유궤랑긍순배계통진행료실험연구。실험결과표명，당태양직사복사강도재400 W·m?2좌우시，집열기출구도열유온도가체140℃。당집열기출구도열유온도재110℃부근시，집열기집열효솔가체60%좌우。재해열원조건하，동력순배부분종기본순배모식절환도회열순배모식시，측산효솔종9.3%제승도10.8%，실측순배효솔종1.57%제승도1.67%，제승료6.07%。실측순배계통효솔재10%좌우，회열모식하략고우기본순배모식。실험중환고찰료불동공질류량하적유궤랑긍순배성능，재공질류량위6.88 kg·min?1시，득도적최대실측평균공솔위386.27 W。일정열원온도하，수착공질류량적증가，팽창궤진구압력증가，순배수출공야증가；재일정적공질류량하，수착열원온도적승고，팽창궤진구적온도제고，진구압력야승고，순배수출공야증가。
To study the performance of solar organic Rankine cycle (ORC) system, a low temperature solar ORC system is proposed and constructed. The system employs R245fa as the working fluid in the power cycle and WD350 heat transfer oil as the heat transfer fluid in the solar collector. The experimental installation consists of a trough solar collector, a screw expander, a working fluid pump, a heat regenerator, a water cooled condenser, and a vapour generator. When the solar beam radiation is about 400 W·m?2 in the experiment, the thermal oil temperature at the outlet of solar heat collector can reach up to 140℃. The collecting efficiency of the collector is 60% at the outlet oil temperature of 110℃. When the working mode of system changes from basic ORC to regenerative cycle, the calculated efficiency of the system is improved from 9.3% to 10.8%, and the experimental value is improved from 1.57% to 1.67%. The measured exergy efficiency of the system is about 10%. The value under regenerative cycle mode is higher than that under the basic ORC mode. The cycle performance at different working fluid flow rates was also studied. The measured maximum average power output was obtained at 386.27 W and working fluid flow rate of 6.88 kg·min?1. With the increase of working fluid flow rate, both expander inlet pressure and work output increase at fixed heat source temperature. With the increase of heat source temperature, the expander inlet temperature and pressure, and the power output increase at fixed flow rate.