Thermodynamic evaluation of a distributed energy system integrating a solar thermochemical process with a double-axis tracking parabolic trough collector

摘要

A new distributed energy system integrating a solar thermochemical process with a double-axis tracking parabolic trough collector is proposed to address the challenges on large seasonal variations of solar-to-fuel efficiency and insufficient utilization of solar energy in exiting distributed energy systems. Low-energy level discontinuous solar energy is upgraded into the chemical energy of syngas via the solar thermochemical process, which is easy to be stored. The double-axis tracking parabolic trough collector is deployed to the solar thermochemical process to eliminate the cosine loss completely to increase the annual thermodynamic efficiency. With the consideration of the variation of solar energy, the coupling between user's loads and energy outputs in the proposed system is investigated, and the favorable on-design and off-design thermochemical performances are numerically validated. Results indicate that the solar fuel production and the solar power production in the proposed system increase approximately 27% annually as compared with the reference system.