In the organic Rankine cycle system

the influence of different working fluids on the thermal performance of the system has always been an important direction of research. R11

R123

R245fa

R600 and R600a are used as organic Rankine cycle's working fluids in this paper

when the temperature of the low temperature waste heat source is constant

the system thermal performance was studied under the conditions of evaporation temperature of 85-145 ℃ and condensation temperature of 25-45 ℃. The comparative performance parameters include: cycle specific work

specific net work

system thermal efficiency

and system exergy loss. The working fluids were comprehensive evaluated in combination with environmental protection

thermal properties and system thermal economy of organic working fluids

the results showed that R600 had the highest efficiency and the least irreversible loss

so the refrigerant R600 is selected as the best working fluid. The optimal system performance reaches when the evaporation temperature is 110-140 ℃ and the condensation temperature is 25 ℃.