Study On The Heat Transfer Characteristics Of Solar Heat Absorption Plate Cores With Internal Corrugated Channels

Compared with solar power generation,photovoltaic/photothermal(PV/T)technology not only increases the thermal energy output,but also improves the efficiency of solar power generation.Then it greatly increases the comprehensive utilization of solar energy.PV/T is one of the key research areas in the field of solar energy utilization.The heat collection part is the key to affect the efficiency of the whole PV/T module,however,the traditional PV/T usually does not consider the optimal design of the heat collection part,which leads to the decline of the comprehensive performance of the PV/T system,which seriously affects the promotion and application of PV/T.In recent years,great progress has been made in the optimization of the inner runner of the collector.However,the research on the heat collecting components of the corrugated runner mainly includes forced convection in the corrugated tube and corrugated plate heat exchanger.There are no heat absorbing plate cores with various built-in corrugated runners.In this paper,the flow and heat transfer characteristics of the corrugated runner inside the ultra-thin superconducting heat absorbing plate core are studied,and the heat absorbing characteristics are given.The optimization direction of hot plate core.Firstly,by investigating the research status of domestic important PV/T components,the shortcomings of PV/T research are summarized,the core content of this study is conformed.The study is the flow and heat transfer characteristics of working substances in the core of the heat absorbing plate,and to optimize the existing heat absorbing plate core.Secondly,the performance of PV/T modules is analyzed theoretically and experimentally.It is found that there is only a temperature difference in the vertical direction of PV/T modules under theoretical conditions.Temperature has a great influence on the efficiency of PV/T modules.Through the analysis of the temperature of the back panel of the core,it is found that the temperature of the back panel of the core first rises and then decreases.The peak temperature at the inlet and outlet parts of the core is not uniform with the peak value of the temperature difference between the inlet and outlet of the core,and the former is delayed by about 20 minutes.The temperature of the central part of the core is higher than that of the middle part on both sides of the core,which is about 0.3-0.5℃higher.Thirdly,the temperature and flow characteristics of working substance in the core of the endothermic plate are further studied by numerical simulation.It is found that the temperature and flow characteristics of working substance in the core of the endothermic plate are similar under different initial conditions.When the inlet velocity is only changed,the outlet temperature is between 300.78~297.54 K,and the collector heat per hour is between(14.8-43.1)·10~3kJ,when the flow velocity is between 0.2-1 m/s and the outlet temperature is between 300.78~297.54K.When the heating surface temperature is changed only,the outlet temperature is between 295.62 and 304.26,and the collector heat per hour is between(12.44~53.64)·10~3kJ when the surface temperature is 298-313 K.Finally,the flow and heat transfer characteristics of different types of heat absorber core are analyzed.It is found that the bubble area should be changed properly when optimizing the bubble type heat absorber core.And different runners,such as striped heat absorbing plate core,can also produce better flow and heat transfer effect.