The Study On The Performance Of Filledtube Plate PV/T System

The utilization and promotion of sustainable energy is a necessary way to solve the problem of increasing energy consumption and irrational energy consumption structure,and the energy pressure and environmental pollution problems,and solar energy has become the largest energy source because of its large amount and long period of development.At present,the utilization of solar energy is mainly through two ways:photothermal and photoelectric,and photovoltaic/thermal system can use solar energy to obtain electricity while utilizing waste heat effectively,it improves the efficiency of solar energy comprehensive utilization,saves land resources,and can be laid on the outside surface of buildings or replace some components as well,which provides a more effective way for solar energy applications.According to the existing problem of structure of the traditional tube plate PV/T module,this paper presents an iron filing filled tube plate PV/T module which fills iron scrap instead of air between absorbing plate and fluid channel,in order to improve the rate of heat transfer between fluid and photovoltaic cells,enhance the heat transfer effect of the system.The iron filing filled tube plate PV/T module was designed and made,and the experimental platform was built according to the related test standards.Experimental research is carried out under five groups of different radiation intensity?400 W/m²⁸00W/m²?,and the experimental results show that the module temperature was effectively reduced by filling iron chip?3.5⁶.5??,and the photoelectric efficiency increased by 19.8%compared with that of the blank system.The water temperature of tank has a greater increase rate in filled system.When considering the cooling water in tank rises to the same temperature,the filling system takes shorter time,and the thermal efficiency is 9.2%higher than that of the blank system.Based on the structure of the iron chip filled tube plate PV/T module,the theoretical model is analyzed in this paper,and the energy balance equation of the system is established.On this basis,the simulation model of the system is established by TRNSYS simulation software and compared with the experimental data.The correctness of the model is verified.The simulation results show that the annual output of electricity in Tianjin is 792.6MJ under the standard annual meteorological data,and the annual total heat is 2558.3MJ.The annual average generation efficiency and the collector efficiency are 15.5%and 49.1%respectively.On the standard day of May,the average generation efficiency and heat efficiency of the whole day are 14%and 41.1%,respectively.The average power generation efficiency of the filling system under the standard test condition is 17.7%,and the average heat efficiency is 52.1%,as well.The performance of the system is improved to some extent compared with the blank system and increases with the increase of filling density.In addition,the different filling density is optimized based on Analytic Hierarchy Process.513 kg/m3is better than the other densities,and several other packing density is in the order of 680 kg/m3,340 kg/m3,780kg/m3?filled with iron plate?,and 0 kg/m3?unfilled?.Finally,the total annual total energy of the unit area filled system is obtained of2704.7MJ 92.5kgce),which is higher than that of the unfilled system,photovoltaic system and photothermal system.The dynamic recovery period is about 9.6 years,and the reductions during the lifetime of the system of CO₂,SO₂,and NO_X that relative to coal are 62.0kg,1.5kg and 1.4kg respectively.