Preliminary analysis on thermodynamic and thermo‐economic performance of a solar CPC–KCS hybrid system

Using solar collectors to actuate Kalina cycle system (KCS) for electricity generation has been an attractive way to take advantage of solar energy. Most of the existing research is about KCS integrated with flat plate collector, evacuated tube collector, or concentrating collectors; however, little...

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Bibliographic Details
Published in:Environmental progress 2019-07, Vol.38 (4), p.n/a
Main Authors: Xiao, Lan, Fan, Ya‐Di, Wu, Shuang‐Ying, Chen, Zhi‐Li
Format: Article
Language:English
Subjects:
compound parabolic concentrator
Concentrators
corrosion potential
Economic analysis
Economic models
Erosion
Evaporation
Exergy
Flat plates
Hybrid systems
Kalina cycle
Organic chemistry
Solar collectors
Solar energy
Solar power
Solar radiation
Temperature effects
Thermodynamics
thermo‐economic analysis
Working fluids
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Summary:Using solar collectors to actuate Kalina cycle system (KCS) for electricity generation has been an attractive way to take advantage of solar energy. Most of the existing research is about KCS integrated with flat plate collector, evacuated tube collector, or concentrating collectors; however, little research focuses on the KCS powered by compound parabolic concentrator (CPC). Considering the merits of CPC, a Kalina 11 cycle system which is directly powered by CPC, named as solar CPC–KCS hybrid system is studied as the research object. Energy, exergy and thermo‐economic models are established to estimate the system performance by varying the solar radiation, evaporating temperature and concentration of working fluid. Results show that higher evaporating temperature improves thermal and exergy efficiency. There are optimal values of Te for maximum wnet, that is, Te,opt = 422.15, 434.15, and 446.15 K, respectively, at Xr = 0.95, 0.93, and 0.91; while Te,opt = 443.15, 437.15, and 425.15 K at Xb = 0.8, 0.7, and 0.6. Higher Xr and lower Xb is generally favorable for system performance. But when Te ≥ 422.15 K, lower Xb is not beneficial to ηex improvement anymore. Additionally, once evaporating temperature exceeds 439.15 K, it is cost‐effective to install a superheater to avoid erosion potential risk. © 2018 American Institute of Chemical Engineers Environ Prog, 38:e13135, 2019
ISSN:1944-7442
1944-7450
DOI:10.1002/ep.13135