Journal
ENERGY CONVERSION AND MANAGEMENT
Volume 182, Issue -, Pages 340-350Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2018.12.021
Keywords
Organic Rankine cycle (ORC); Lubricant oil ratio; Degree of superheating; Thermal efficiency; System generating efficiency
Categories
Funding
- National Natural Science Foundation of China [51806081]
- Natural Science Foundation of Jiangsu Province [BK20180882]
- China Postdoctoral Science Foundation [2018M632241]
- Open Foundation Program of Key Laboratory of Efficient Utilization of Low and Medium Grade Energy (Tianjin University), the Ministry of Education of China [201806-402]
- Ministry of Science and Technology, Taiwan [MOST 107-2221-E-027-091]
- Research Center of Energy Conservation for New Generation of Residential, Commercial, and Industrial Sector from The Featured Areas Research Center Program within Ministry of Education (MOE) in Taiwan
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The lubricant oil can prevent the leakages and reduce the expander friction losses, but blend with the pure working fluid because of the absence of oil separator and affect eventually the organic Rankine cycle (ORC) operation characteristic. Based on a 3 kW ORC experimental prototype, the effect of lubricant oil ratio (1.2%, 3.1%, 5.0%, 6.7% and 9.0%) using R123 on the system behavior under three different degree of superheating (5, 10 and 15 degrees C) has been investigated. The heat source temperature is fixed at 130 degrees C, while the mass flow rate is controlled by adjusting the pump frequency. The heat input is first amended, and the detailed components' behaviors are examined. The system overall performance, including thermal efficiency and system generating efficiency is explored. Results demonstrated that the deviation between the calculated heat input and modified heat input is no more than 5%. The lubricant oil enhances the pump behavior, whereas deteriorates the expander shaft power and electrical power. Meanwhile, the thermal efficiency is insensitive on the lubricant oil ratio for a degree of superheating higher than 10 degrees C. The system generating efficiencies for degree of superheating of 10 and 15 degrees C are in range of 5.44-5.61% (3.03%) and 5.34-5.69% (6.15%), respectively.
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