期刊
JOURNAL OF SUPERCRITICAL FLUIDS
卷 154, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.supflu.2019.104602
关键词
HFO-1234ze(E); Supercritical organic rankine cycle; Working fluid; Thermal stability; Reaction kinetic model
资金
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) from the Ministry of Trade, Industry & Energy(MOTIE), Republic of Korea [20172010105960]
- Energy Efficiency & Resources Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) from the Ministry of Trade, Industry & Energy, Republic of Korea [201820101066550]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20172010105960] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The supercritical organic Rankine cycle (SORC) is a highly promising technique to recover non-utilized low-to-medium-temperature heat sources. A good thermal stability of the working fluid is crucial to create a safe SORC system. Herein, the thermal stability of a new type of working fluid, HFO-1234ze(E) (trans-1,3,3,3-tetrafluoroprop-1-ene), which is an environmentally friendly fourth-generation refrigerant, is investigated in supercritical regimes. The experimental conditions are designed for long-term reactions for 56 days at 453.15 K and 5 MPa, which represent the highest temperature and pressure, respectively, at the SORC turbine inlet. In addition, the effects of temperature, pressure, and time on the decomposition of HFO-1234ze(E) are investigated over a short experimental period of up to 24h to propose the reaction kinetics. Decomposed gases species from HFO-1234ze(E) included difluoromethane (HFC-32), pentafluoro ethane (HFC-125), 1,1,1-trifluoroethane (HFC-143a), 1,1,1,2,2-pentafluoropropane (HFC-245fa). For extended time periods or in high-pressure and high-temperature conditions, HFO-1234ze(E) decomposes to form liquid products with weight average molecular weights in the range of 470-740 g mol(-1). The decomposition of HFO-1234ze(E) can be fitted with a first-order kinetic model. Under the assumption that major decomposition occurs at the turbine inlet, the decomposition rate of HFO-1234ze(E) is found to be 0.02% per year in this study. (C) 2019 Elsevier B.V. All rights reserved.
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