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Optimum composition ratios of multicomponent mixtures of organic Rankine cycle for engine waste heat recovery
Author(s) -
Yang MinHsiung,
Yeh RongHua
Publication year - 2020
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.4977
Subject(s) - organic rankine cycle , working fluid , degree rankine , thermodynamics , thermal efficiency , waste heat recovery unit , rankine cycle , process engineering , waste heat , chemistry , waste management , power (physics) , heat exchanger , organic chemistry , engineering , physics , combustion
Summary With the temperature glide in saturation states, the mixture working fluids have the advantages in thermal energy conversion. In this study, through the investigation in optimum mass fractions of multicomponent mixture working fluids, the economic performance enhancement of the organic Rankine cycle system is obtained for recovering waste heat from engine. The zero ozone‐depletion‐potential and dry working fluids of R236fa, R245fa, and R1336mzz(Z) are selected as the components of multicomponent mixtures in the system. The net power output, heat transfer calculation, and apparatus cost evaluation are employed to evaluate the power cost of the organic Rankine cycle system. Parameters of temperatures of waste heat sources and efficiencies of expanders are taken into account. The comparisons of economic performances for single‐component working fluid and multicomponent mixtures with optimum mass fractions are proposed. The results show that R245fa, having a levelized cost of energy, LCOE , of 8.75 × 10 −2 $/kW‐h, performs the best for single‐component working fluids, better than R236fa by 1.6% and R1336mzz(Z) by 8.3%. All the two‐component mixtures are superior to their single‐component working fluids in economic performance. Among the three two‐component mixture working fluids, R1336mzz(Z)/R236fa has the lowest LCOE min , 8.57 × 10 −2 $/kW‐h, followed by R236fa/R245fa and R245fa/R1336mzz(Z). In addition, R236fa/R245fa/R1336mzz(Z) mixture, which has a LCOE min of 8.47 × 10 −2 $/kW‐h, economically outperforms all other working fluids and has a lower LCOE min than R236fa/R245fa by 1.7% and R245fa/R1336mzz(Z) by 2%.