Thermodynamic and economic analysis of a micro-combined polygeneration system coupled with solar energy and fuels for di
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Thermodynamic and economic analysis of a micro‑combined polygeneration system coupled with solar energy and fuels for distributed applications Huibin Xu1 · Zhaoli Zhang1,2 · Zicheng Hu1 · Xiaoli Dai1 · Junfeng Wang1 · Wenrui Jiao1,2 · Yanping Yuan3 · Patrick E. Phelan4 Received: 20 July 2019 / Accepted: 6 May 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract A novel micro-combined polygeneration system based on solar energy and fuels is designed with aim to simultaneously satisfy energy demands of electricity, heating and cooling in distributed areas. Integration solar radiation with conventional natural gas-fired power systems is conceived to eliminate existing disadvantages of low efficiency and high cost for fuel-only and solar-only plants. Thermodynamic and economic analyses are evaluated to explore performance of proposed systems with three working fluids. Energetic and exergic efficiencies are individually 0.839 and 0.4536, 0.8721 and 0.5852, and 0.8656 and 0.5825 for N2-, He- and Ar-based micro-combined systems under specified power capacity of 100 kW. Solar collector field, compressor, turbine and combustion chamber exhibit four largest exergy destruction, followed orderly by heat exchanger, generator, condenser, evaporator, throttling valve and pump. Preliminary economic analysis indicates that levelized electricity costs of N2-, He- and Ar-based micro-combined systems are 0.112, 0.103 and 0.101 $ kWh−1 with corresponding payback periods of 4.563, 5.090 and 5.138 years. Parametric analysis reveals that five operating parameters (compression ratio, turbine inlet temperature, solar collector field outlet temperature, generator outlet temperature and split ratio) exert noticeable influence on thermal efficiency of micro-combined systems. In conclusion, proposed micro-combined polygeneration system achieves efficient conversation of thermal energy into electricity, heating and cooling at a rational energy utilization for distributed areas. Keywords Micro-combined system · Distributed application · Thermodynamic analysis · Exergy destruction · Economic evaluation List of symbols Abbreviations ABS Absorber CC Combustion chamber COMP Compressor COND Condenser
* Zhaoli Zhang [email protected] 1
School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
2
Zhenjiang Hydraulics Co., Ltd, Zhenjiang 212021, China
3
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China
4
School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe 85287‑6106, USA
EVAP Evaporator GEN Generator HX Heat exchanger LEC Levelized electricity cost LHV Low heating value MIX Mixer PBP Payback period PUMP Pump SCF Solar collector field SP Splitter TES Thermal energy storage TURB Turbine TV Throttling valve Greeks α Absorptivity ε Emissivity η Efficiency
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Vol.:(0123456789)
ρ Reflectivity σ Stefan–Boltzmann constant ψ Flow exergy ζ Chemical exergy index Subscripts 0 Dead state a Ambient c Cooling C
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