Modelling and simulation analysis of a constant temperature self-driven collector

In this paper, a constant temperature self-driven solar air collector (CTSD-SAC) is proposed, which is modeled and simulated by TRNSYS16.1. The simulation is based on four groups of typical meteorological parameters in Qinhuangdao city in summer. Using the single-factor analysis method of control variables, the operation characteristics of CTSD-SAC under different set temperature conditions are discussed, and the influence of the built-in PV board (solar panel) area on the performance of CTSD-SAC is analysed. The results show that there is a non-linear relationship between the flow rate decrease of CTSD-SAC and the set temperature. Both solar irradiance and outdoor temperature affect the outlet flow of CTSD-SAC, and the influence of outdoor temperature is more significant, but the effect on the photothermal photoelectrical efficiency of the system is not obvious, which reflects the stability of CTSD-SAC performance. The analysis shows that when the PV board area increases by 0.1 m2, the photothermal efficiency decreases by 10%. Through PID control, the steady-state error of collector outlet temperature is less than 2.11%, and the rising time is less than 15 min.