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Performance Characteristics of Combined Heat and Power Generation with Series Circuit Using Organic Rankine Cycle

유기랭킨사이클을 이용한 직렬 열병합 사이클의 성능 특성

  • Kim, Kyoung-Hoon (Department of Mechanical Engineering, Kumoh National Institute of Technology) ;
  • Jung, Young-Guan (Department of Mechanical Engineering, Kumoh National Institute of Technology)
  • 김경훈 (금오공과대학교 기계공학과) ;
  • 정영관 (금오공과대학교 기계공학과)
  • Received : 2011.09.29
  • Accepted : 2011.10.21
  • Published : 2011.10.30

Abstract

A combined heat and power cogeneration system driven by low-temperature sources is investigated by the first and second laws of thermodynamics. The system consists of Organic Rankine Cycle (ORC) and an additional process heater as a series circuit. Seven working fluids of R152a, propane, isobutane, butane, R11, R123, isopentane and n-pentane are considered in this work. Maximum mass flow rate of a working fluid relative to that of the source fluid is considered to extract maximum power from the source. Results indicate that the second-law efficiency can be significantly increased due to the combined heat and power generation. Furthermore, higher source temperature and lower turbine inlet pressure lead to lower second-law efficiency of ORC system but higher that of combined system. Results also show that the optimum working fluid varies with the source temperature.

Acknowledgement

Supported by : 금오공과대학교

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