It is an efficient way to converse solar thermal energy by supercritical CO? Brayton cycle. Considering the characteristics of low-pressure ratio and large recuperation of the supercritical CO? power cycle, a combined cooling, heating, and power system is proposed to utilize the waste heat of turbine outlet to drive operations of cooling and heating. Firstly, economic-environmental-matching analyses with variable solar multiple are conducted in five climatic areas. Secondly, the comprehensive performances of the system are investigated. Finally, the uncertainty analysis of the economic performance is carried out. The findings indicate that the levelized cost of electricity of the system is the lowest, and both pollutant emission reduction rate and primary energy saving rate of the system are close to 100% in Lhasa area with abundant solar resource, when the solar multiple is 2. 5. As for the uncertainty analysis, the levelized cost of electricity of 0. 081? mathrmkWh\^-1 is achieved. Therefore, a method to improve efficiency of the solar thermal energy is provided.
Shen et al. (Thu,) studied this question.