Thermodynamic analysis and performance optimization of transcritical power cycles using CO2-based binary zeotropic mixtures as working fluids for geothermal power plants

•TPCs with CO2-based binary zeotropic mixtures are investigated for low-temperature geothermal power plants.•Parametric optimization is performed by the pattern search algorithm (PSA).•Exergy, exergy and economic analyses are conducted. Transcritical power cycles (TPCs) using CO2-based binary zeotro...

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Veröffentlicht in:Applied thermal engineering Jg. 115; S. 292 - 304
Hauptverfasser: Wu, Chuang, Wang, Shun-sen, Jiang, Xihang, Li, Jun
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Oxford Elsevier Ltd 25.03.2017
Elsevier BV
Schlagworte:
Additives
Carbon dioxide
CO2-based binary zeotropic mixtures
Cooling
Economic analysis
Economic impact
Electric power generation
Electric power plants
Geothermal energy
Geothermal power
Geothermal power plants
Geothermal water
Heat transfer
Pattern search
Pattern search algorithm
Refrigerants
Search algorithms
Thermodynamics
Transcritical power cycle
Water temperature
Working fluids
Zeotropic mixtures
Transcritical power cycle
Pattern search algorithm
Geothermal water
Economic analysis
CO2-based binary zeotropic mixtures
ISSN:1359-4311, 1873-5606
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Zusammenfassung:•TPCs with CO2-based binary zeotropic mixtures are investigated for low-temperature geothermal power plants.•Parametric optimization is performed by the pattern search algorithm (PSA).•Exergy, exergy and economic analyses are conducted. Transcritical power cycles (TPCs) using CO2-based binary zeotropic mixtures for the conversion of low-grade geothermal water at 100–150°C into power are presented and analyzed when cooling water temperature (Tcw) is 10–30°C in this paper. 6 refrigerants are selected as the additives into CO2 according to 2 criteria. Performances of TPCs with 6 selected CO2-based mixtures are optimized by pattern search algorithm (PSA). Thermodynamic and economic analyses are conducted. The results reveal that R161/CO2 is the best fluid for a TPC in terms of both thermal performance and economic performance while R290/CO2 might be an unsuitable working fluid in TPC due to its lower thermal performance. When Tcw=10–20°C, a TPC using R161/CO2 at XR161=0.7 can increase net power output by 14.43–50.46% and decrease cost per net power by 27.96–48.72% compared with a TPC using CO2. The selected CO2-based mixtures can reduce CPP of a TPC compared with CO2 although more heat transfer area is required. Meanwhile, the CO2-based mixtures can decrease the high operating pressure, and enlarge the condensing temperature range compared with CO2. In addition, the CO2-based mixtures except R161/CO2 and R152a/CO2 are not recommended for a TPC when Tcw is low.
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ISSN:1359-4311
1873-5606
DOI:10.1016/j.applthermaleng.2016.12.077