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A single screw expander was used as the power generation machine. The effect of cooling water flow rate on the performance of the ORC system and the single screw expander is studied to generate power from low-grade waste heat. The results show that when the cooling water flow rate from 8 m3·h-1 to 19 m3·h-1, the output power and shaft efficiency of the single screw expander increase by 19.5 % and 13% from 4.31 kW and 36.38% to 5.15 kW and 41.1%, respectively. In this experimental system, when the cooling water flow is 12 m3·h-1 and the power consumed by the circulation pump, the lubricating oil pump, the water pump and the cooling tower fan were all taken into account, the maximum value of the system net output power and the system net efficiency would be 2.44 kW and 2.47 % respectively. Therefore, the cooling water flow rate significantly affected the performance of an ORC system with low-grade waste heat, which could serve as important reference for designing cooling source system and optimizing ORC system performance. © 2018, Science Press. All right reserved.
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