Thermodynamic analysis and turbine design of a 100 kW OTEC-ORC with binary non-azeotropic working fluid
文献类型： 外文期刊
作者： Ma, Qingfen 1 ; Gao, Zezhou 1 ; Huang, Jie 1 ; Mahian, Omid 3 ; Feng, Xin 1 ; Lu, Hui 2 ; Wang, Shenghui 1 ; Wang, Chengpeng 5 ; Tang, Rongnian 1 ; Li, Jingru 1 ;
作者机构： 1.Hainan Univ, Coll Mech & Elect Engn, Haikou 570228, Hainan, Peoples R China
2.Chinese Acad Trop Agr Sci, Inst Environm & Plant Protect, Haikou 571101, Hainan, Peoples R China
3.Xi An Jiao Tong Univ, Sch Chem Engn & Technol, Xian 710049, Shanxi, Peoples R China
4.Imperial Coll London, Dept Chem Engn, London SW7 2AZ, England
5.MNR, Inst Seawater Desalinat & Multipurpose Utilizat, 55 Hanghai Rd, Tianjin 300192, Peoples R China
6.Tomsk State Univ, Lab Convect Heat & Mass Transfer, Tomsk 634045, Russia
关键词： Ocean thermal energy; Organic Rankine cycle; Non-azeotropic working fluid; Turbine; Numerical simulation
期刊名称：ENERGY （ 影响因子：9.0； 五年影响因子：8.3 ）
ISSN： 0360-5442
年卷期： 2023 年 263 卷
页码：
收录情况： SCI
摘要： The present paper deals with the performance analysis of an ocean thermal energy conversion (OTEC) plant based on the organic Rankine cycle (ORC) with a theoretical outpower of 100 kW where a non-azeotropic mixture has been used as the working fluid. Hydrofluoroolefins (HFOs) are selected as the components of the binary non-azeotropic working fluid due to their desired thermodynamic properties, higher safety and stability, lower cost and environmental friendliness i.e., zero ODP (Ozone Depletion Potential) and low GWP (Global Warming Potential). In this study, R1224yd(Z) is adopted as the first component due to its lower flammability and toxicity comparing with other HFOs. Through comparisons between several refrigerants, R1243zf was selected as the second component of the binary non-azeotropic working fluid by considering temperature glide and the system efficiency. The performance of OTEC-ORC is also evaluated for two different working fluids i.e., R1224yd(Z)/R1243zf mixture, and pure NH3 (common working fluid in the OTEC-ORC). The optimal compo-sition of the mixed working fluid R1224yd(Z)/R1243zf is obtained of 16:84 with the maximum system efficiency. Next, a gas turbine is designed one-dimensionally and simulated three-dimensionally. The one-dimensional calculation results fit well with the three-dimensional results. At the design point, the turbine output power is 88.63 kW and the efficiency is 87.10%. The thermodynamic findings prove that organic Rankine cycle with binary mixture of R1224yd(Z)/R1243zf is a promising alternative for pure NH3.
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