In order to improve the efficiency of organic Rankine cycle(ORC)

a new organic Rankine cycle system combining reheating

regenerative extraction and internal regenerative cycle was proposed.Taking the organic fluid R245 fa as the research object

the variations of the new system's thermal efficiency and exergy loss with the reheating steam pressure and steam extraction pressure were investigated.Moreover

the thermal performance of this new system was compared with that of the single reheating ORC system

the internal regenerative ORC system and the regenerative ORC combining with regenerative-internal regenerative ORC

under the condition with the best reheating pressure.The results show that

there's an optimum reheating steam pressure(1.4MPa)and the heat efficiency of the new system gradually increases with the extraction pressure

but the growth rate turns tender.The reheating-regenerative-internal regenerative ORC system has the best thermal performance

and its heat efficiency reaches 18.86%

which is 2.63%and1.51% higher than that of the reheating ORC system and the internal regenerative ORC system with the same level parameters

respectively.