Comparative Study Of Different Types Of PV/T Integrated System

Solar PV technology has beening mature,which obtains a quick popularization and application in recent years.However,in the actual operation of solar photovoltaic power generation system,the photovoltaic cell operating temperature gradually increases,reducing the photovoltaic cell photoelectric conversion efficiency.The hybrid phtovoltaic/thermal(PV/T)technology improves photoelectric conversion efficiency,and this techonolgy can generate thermal enegy,so it can improve the comprehensive utilization of solar energy.In this paper,through the combination of theoretical simulation and experimental research methods,a comparative study of different types of PV/T hot water systems in different typical areas is provided,which provides a theoretical basis for the selection of PV/T hot water system for users with different purposes.The research work mainly includes the following aspects:(1)Based on the theoretical analysis of three types of PV/T hot water systems,the mathematical models of PV/T hot water system were established.At the same time,These PV/T hot water system simulation programs were established by using MATLAB and REFPROP physical property calculation software,and the whole day dynamic performance of the system was simulated.(2)Water type and heat pipe type PV/T hot water system experimental test platforms were designed and constructed.By using the two test platforms and the existing heat pump type PV/T hot water system experimental test platform,the thermal and electrical output performance of the three systems in the meteorological conditons of Nanjing were tested,and the variation rules of the parameters were analyzed.Meanwhile,comparing the experimental results with the simulation results,the results showed that the simulated values of parameters were in good agreement with the experimental values,and the average errors were within 9%.Therefore,the three PV/T sysem mathematical models can simulate the real system to a certain extent.(3)According to the typical meteorological parameters of four regions in Lhasa,Kunming,Nanjing and Guiyang,the annual performance of the three PV/T hot water systems in the four regions were calculated by using the validated mathematical model.This paper presented the evaluation criteria of the power generation energy consumption and the total energy consumption rate of the system,and evaluated the performance of each PV/T system.Reshults show that if the user is the main purpose of the power generation in each region,the user can give priority to the heat pipe type PV/T system.Four regions of the heat pipe type PV/T system annual total power generation energy consumption rate can reach 7.95?5.83?4.41?4.00.It can be seen that the water type PV/T system is preferred if the user takes the comprehensive energy benefit as the main purpose and no temperature requirement.The total energy consumption rate of water type PV/T system in four regions without auxiliary heating can reach 42.9?32.7?23.8?20.5.If the user proceeds to a comprehensive energy as the main purpose and considers the temperature requirements,the user in solar energy resoure-rich bands and more resource-rich zone in Lhasa,Kunming area can prefers water type PV/T system.The total energy consumption of auxiliary heating in the two areas is 7.04?4.29 respectively;the solar energy resources in general belt and resoures-poor in Nanjing?Guiyang area,the users can give priority to the use of heat pump type PV/T system.The total energy consumption of auxiliary heat for PV/T system in the two regions was 3.26?2.40 respectively.(4)Compared with the electric heating system,in addition to solar energy resuorces in resuores-poor in Guiyang region of the heat pump type PV/T system,the PV/T in the other region including the water type and heat pipe type PV/T systems in Guiyang area,all have certain economic benefits,which can meet the energy demand of user and save the cost of capital.At the same time,the PV/T systems in each region all have excellent environmental benefits,and can reduce the pollution of the ecological environment.