In addition, solar-to-electricity exergy efficiency of STCG is at least 1.83% higher than that of STG.
The results demonstrate that the hydrogen to coal ratio, energy efficiency, net electricity power and exergy efficiency of the overall system for Yangcheng anthracite are 0.096 kg/kg, 46.52%, 1.71 MW and 43.92%, respectively.
The effects of fuel cell current density on exergy efficiency, electricity production and exergy destruction rate are investigated.
The trade-off between total investment costs and the exergy efficiency of electricity production was obtained, and analysed to identify operating conditions that minimise tar formation to prevent equipment fouling.
Four performance indicators are considered for the analysis; namely, energy efficiency (ENE), exergy efficiency (EXE), levelized cost of electricity (COE), and the total investment (TI) cost.
The system costs and revenues estimated, and the effect of two important design parameters (i.e., operational temperature and current density of SOFC) on exergy efficiency and levelized cost of electricity (LCOE) were investigated.
The results show that the system is able to compensate the fluctuations of wind power plants, and present high annual overall energy and electricity efficiencies of 80.2% and 31.4% and exergy efficiency of 56.1%.
The results show that ammonia mass fraction variation has the most effect on exergy efficiency, solar fraction and levelized cost of electricity.
This design is capable of producing electricity directly along with high temperature thermal energy that can be stored for dispatchable electricity production and has the potential to significantly improve the exergy efficiency of parabolic troughs plants.
Finally, the performance of the integrated system is calculated and includes energy and exergy efficiency, investment costs, operating costs and district heating or electricity levelized costs.
