研究目的
To propose a new solar hybrid clean fuel-fired distributed energy system with solar thermochemical conversion to increase thermodynamic efficiency and save fossil fuel.
研究成果
The proposed solar hybrid DES with double-axis tracking and solar thermochemical conversion achieves high efficiency (24.66% solar-to-electric), energy savings (40.91% fuel saving), and environmental benefits (51.43% carbon emission reduction). It demonstrates stable operation under varying conditions and offers a feasible solution for distributed energy applications, with recommendations for further optimization and real-world implementation.
研究不足
The study assumes constant dissipated heat of the ICE in off-design conditions and neglects the impact of exhaust gas variations on the COP of the absorption chiller. High initial investment costs for solar collectors and thermochemical units may be a barrier. The system's performance is location-dependent on solar availability.
1：Experimental Design and Method Selection:
The study involves designing a distributed energy system (DES) integrating solar thermochemical conversion of methanol decomposition driven by a double-axis parabolic trough collector (PTC). Mathematical models are used for solar thermochemical conversion, internal combustion engine (ICE) performance, and system evaluation.
2：Sample Selection and Data Sources:
Meteorological data from North China (E116°33`, N39°27`) measured by BSRN3000 equipment is used for solar irradiation, ambient temperature, and wind speed. User load data for an office building (28000 m2) is simulated using EnergyPlus software.
3：List of Experimental Equipment and Materials:
Equipment includes double-axis PTCs, solar thermochemical receivers/reactors with Cu/ZnO/Al2O3 catalyst, ICE (JMS 320 GS-S.L. by GE), Li-Br absorption chiller, heat exchangers, syngas storage tank, and auxiliary components. Materials include methanol as fuel.
4：Experimental Procedures and Operational Workflow:
The system operates by preheating methanol, driving methanol decomposition with solar heat, storing syngas, and using syngas in ICE to generate electricity, heat, and cooling. Operational strategies adjust based on solar irradiation and load demands.
5：Data Analysis Methods:
Performance is evaluated using energy and exergy analyses, with criteria such as solar-to-electric efficiency, primary energy ratio, and carbon emission saving rate. Mathematical models simulate off-design conditions and annual performances.
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