Simulation and Parametric Optimization of a Solar Energy Utilization Air-Conditioning System for Rural Buildings Based on CPV/T

Abstract To enhance the conversion efficiency of solar energy in rural buildings, a solar energy comprehensive utilization system is proposed for rural buildings, which mainly consists of three subsystems: solar concentrated photovoltaic/photothermal subsystem, energy supply and heat storage subsystem, and photovoltaic/photothermal utilization subsystem. A system simulation model is developed in trnsys to evaluate the system's performance under various operating conditions. The key components in this system are validated, and the errors indicate that the model can be used as a system simulation. Furthermore, the effects of outlet temperature and fluid flowrate of the heat collector, heat supply tank outlet temperature, load ratio, etc., on the system performance are studied, and the optimal flowrate, components outlet temperatures, and load ratio are obtained for this system. The control strategy is proposed and used in the simulation based on the optimal parameters, and then the energy consumption structure is investigated. Simulation results reveal that during the cooling season, solar thermal energy contributes 81.8% of the total energy consumption, while the contributions from natural gas and photovoltaic electricity are 1.7% and 16.5%, respectively. These findings confirm the technical feasibility and high solar energy utilization of the proposed system, highlighting its potential as an efficient and sustainable energy solution for rural building applications.