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Title: Thermodynamics investigation of a solar power system integrated oil and molten salt as heat transfer fluids
Author: Liu, Qibin1, 2; Bai, Zhang1, 2; Sun, Jie1; Yan, Yuejun1, 3; Gao, Zhichao1; Jin, Hongguang1, 2
Source: APPLIED THERMAL ENGINEERING
Issued Date: 2016-01-25
Volume: 93, Pages:967-977
Keyword: Parabolic trough solar power system ; Dual-solar field ; Heat transfer fluid ; Thermodynamics investigation ; Off-design
DOI: 10.1016/j.applthermaleng.2015.10.071
DOC Type: Article
English Abstract: In this paper, anew parabolic trough solar power system that incorporates a dual-solar field with oil and molten salt as heat transfer fluids (HTFs) is proposed to effectively utilize the solar energy. The oil is chosen as a HTF in the low temperature solar field to heat the feeding water, and the high temperature solar field uses molten salt to superheat the steam that the temperature is higher than 773 K. The produced superheated steam enters a steam turbine to generate power. Energy analysis and exergy analysis of the system are implemented to evaluate the feasibility of the proposed system. Under considerations of variations of solar irradiation, the on-design and off-design thermodynamic performances of the system and the characteristics are investigated. The annual average solar-to-electric efficiency and the nominal efficiency under the given condition for the proposed solar thermal power generation system reach to 15.86% and 22.80%, which are higher than the reference system with a single HTF. The exergy losses within the solar heat transfer process of the proposed system are reduced by 7.8% and 45.23% compared with the solar power thermal systems using oil and molten salt as HTFs, respectively. The integrated approach with oil and molten salt as HTFs can make full use of the different physical properties of the HTFs, and optimize the heat transfer process between the HTFs and the water/steam. The exergy loss in the water evaporation and superheated process are reduced, the system efficiency and the economic performance are improved. The research findings provide a new approach for the improvement of the performances of solar thermal power plants. (C) 2015 Elsevier Ltd. All rights reserved.
WOS Headings: Science & Technology ; Physical Sciences ; Technology
WOS Subject: Thermodynamics ; Energy & Fuels ; Engineering, Mechanical ; Mechanics
WOS Subject Extended: Thermodynamics ; Energy & Fuels ; Engineering ; Mechanics
WOS Keyword Plus: SIMULATION ; PERFORMANCE ; TECHNOLOGY ; ENERGY ; PLANTS
Indexed Type: SCI
Funder: National Natural Science Foundation of China(51276214 ; project of Outstanding Young Scientists, Chinese Academy of Sciences ; Foundation of Key Laboratory of Thermo-Fluid Science and Engineering (Xi'an Jiaotong University), Ministry of Education, Xi'an, P. R. China ; 51236008)
Language: 英语
WOS ID: WOS:000367776700101
Citation statistics:
Content Type: 期刊论文
URI: http://ir.etp.ac.cn/handle/311046/112328
Appears in Collections:中国科学院工程热物理所(论文库)_期刊论文(SCI)

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description.institution: 1.Chinese Acad Sci, Inst Engn Thermophys, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100190, Peoples R China
3.Univ Penn, Dept Mech Engn & Appl Mech, Philadelphia, PA 19104 USA
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