RESEARCH ARTICLE

Performance analysis of cogeneration systems based on micro gas turbine (MGT), organic Rankine cycle and ejector refrigeration cycle

  • Zemin BO 1 ,
  • Kai ZHANG 1 ,
  • Peijie SUN 2 ,
  • Xiaojing LV 1 ,
  • Yiwu WENG , 1
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  • 1. School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  • 2. Aerospace System Engineering Shanghai, Shanghai 200240, China

Received date: 26 Jul 2018

Accepted date: 28 Oct 2018

Published date: 20 Mar 2019

Copyright

2018 Higher Education Press and Springer-Verlag GmbH Germany, part of Springer Nature

Abstract

In this paper, the operation performance of three novel kinds of cogeneration systems under design and off-design condition was investigated. The systems are MGT (micro gas turbine) + ORC (organic Rankine cycle) for electricity demand, MGT+ ERC (ejector refrigeration cycle) for electricity and cooling demand, and MGT+ ORC+ ERC for electricity and cooling demand. The effect of 5 different working fluids on cogeneration systems was studied. The results show that under the design condition, when using R600 in the bottoming cycle, the MGT+ ORC system has the lowest total output of 117.1 kW with a thermal efficiency of 0.334, and the MGT+ ERC system has the largest total output of 142.6 kW with a thermal efficiency of 0.408. For the MGT+ ORC+ ERC system, the total output is between the other two systems, which is 129.3 kW with a thermal efficiency of 0.370. For the effect of different working fluids, R123 is the most suitable working fluid for MGT+ ORC with the maximum electricity output power and R600 is the most suitable working fluid for MGT+ ERC with the maximum cooling capacity, while both R600 and R123 can make MGT+ ORC+ ERC achieve a good comprehensive performance of refrigeration and electricity. The thermal efficiency of three cogeneration systems can be effectively improved under off-design condition because the bottoming cycle can compensate for the power decrease of MGT. The results obtained in this paper can provide a reference for the design and operation of the cogeneration system for distributed energy systems (DES).

Cite this article

Zemin BO , Kai ZHANG , Peijie SUN , Xiaojing LV , Yiwu WENG . Performance analysis of cogeneration systems based on micro gas turbine (MGT), organic Rankine cycle and ejector refrigeration cycle[J]. Frontiers in Energy, 2019 , 13(1) : 54 -63 . DOI: 10.1007/s11708-018-0606-7

Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant No. 51376123) and the Aerospace Innovation Project (No. 0510).
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