Journal
ENERGY CONVERSION AND MANAGEMENT
Volume 242, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2021.114323
Keywords
Economic analysis; Heat exchanger; Heat transfer area; Organic Rankine cycle; Working fluid
Categories
Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2020R1G1A101062011]
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Double and added double stage organic Rankine cycle systems are utilized to recover exhaust gas waste heat of dual fuel engines. After energy, exergy, and economic analyses, several working fluid combinations are evaluated to improve system performance. The optimal working fluid combinations are recommended based on power, heat transfer area, and payback period considerations.
Double and added double stage organic Rankine cycle systems are configured to recover exhaust gas waste heat of dual fuel engines. To evaluate the performance of the models proposed here, energy, exergy and economic analyses are performed. Several working fluids are evaluated for recommendation for double and added double stage organic Rankine cycle systems. In the double stage organic Rankine cycle, cycle 1 and cycle 2 are connected in parallel. Working fluids R123, R141b, and R601 are used in cycle 1, and R245fa, R236ea, and R1233zd in cycle 2. In the double stage organic Rankine cycle, the working fluid combinations of R601-R1233zd, R601R245fa and R123-R245fa show better performance when considering power, heat transfer area and payback period, which are 1760 kW, 2108.9 m2 and 4.21 year, respectively for R601-R245fa. In the added double stage organic Rankine cycle, cycle 1 and cycle 2 are connected in two stages and cycle 1 and cycle 3 in parallel. The net power of the working fluid combinations of R123-R245fa and R123-R1233zd are 1799 kW and 1782 kW, respectively, which are higher than those of the others. Further, for R123-R245fa, the heat transfer area and payback period are 3352 m2 and 6.20 year, respectively, which is better compared to those of other working fluid combinations.
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