A novel hybrid solar concentrating Photovoltaic/Thermal (CPV/T) system with beam splitting technique is presented. In this system, a beam splitter is used to separate the concentrated solar radiation into two parts: o...A novel hybrid solar concentrating Photovoltaic/Thermal (CPV/T) system with beam splitting technique is presented. In this system, a beam splitter is used to separate the concentrated solar radiation into two parts: one for the PV power generation and the other for thermal utility. The solar concentrator is a flat Fresnel-type concentrator with glass mirror reflectors. It can concentrate solar radiation onto solar cells with high uniformity, which is beneficial to improving the efficiency of solar cells. The thermal receiver is separated to the solar cells, and therefore, the thermal fluid can be heated to a relatively high temperature and does not affect the performance of solar cells. A dimensionless model was developed for the performance analysis of the concentrating system. The effects of the main parameters on the performance of the concentrator were analyzed. The beam splitter with coating materials Nb2O3 /SiO2 was designed by using the needle optimization technique, which can reflect about 71% of the undesired radiation for silicon cell(1.1m < 3m) to the thermal receiver for thermal utility. The performance of this CPV/T system was also theoretically analyzed.展开更多
In this paper, we propose a thermal model of a hybrid photovoltaic/thermal concentration system. Starting from the thermal balance of the model, the equation is solved and simulated with a MATLAB code, considering air...In this paper, we propose a thermal model of a hybrid photovoltaic/thermal concentration system. Starting from the thermal balance of the model, the equation is solved and simulated with a MATLAB code, considering air as the cooling fluid. This enabled us to evaluate some of the parameters influencing the electrical and thermal performance of this device. The results showed that the temperature, thermal efficiency and electrical efficiency delivered depend on the air mass flow rate. The electrical and thermal efficiencies for different values of air mass flow are encouraging, and demonstrate the benefits of cooling photovoltaic cells. The results show that thermal efficiency decreases air flow rate greater than 0.7 kg/s, whatever the value of the light concentration used. The thermal efficiency of the solar cell increases as the light concentration increases, whatever the air flow rate used. For a concentration equal to 30 sun, the thermal efficiency is 0.16 with an air flow rate equal to 0.005 kg/s;the thermal efficiency increases to 0.19 with an air flow rate equal to 0.1 kg/s at the same concentration. An interesting and useful finding was that the proposed numerical model allows the determination of the electrical as well as thermal efficiency of the hybrid CPV/T with air flow as cooling fluid.展开更多
Solar energy is considered to be one of the most promising renewable and sustainable energy sources.The efficient utilization of solar energy has become a major requirement to build a clean and efficient energy system...Solar energy is considered to be one of the most promising renewable and sustainable energy sources.The efficient utilization of solar energy has become a major requirement to build a clean and efficient energy system and achieve the goal of carbon neutrality.The utilization of solar radiation mainly adopts two key technologies:concentrating photovoltaic(PV)and concentrated solar power(CSP).Currently,the cost of CSP with heat storage is about 9c/kWh(same as commercial PV systems)and is expected to drop to 5c/kWh by 2030.From a system level,this paper focuses on analyzing,a system for preparing clean solar fuel based on solar thermal fossil energy,the current mainstream concentrated solar thermal power generation system,the complementary utilization system coupled with multiple energy sources,and the efficient and economical multigeneration system.On the basis of this literature review,the key challenges and future development prospects for the application of concentrating solar energy systems are outlined.A concentrated solar utilization system needs to further improve efficiency and reduce costs in order to expand the scale and promote the market,it has far-reaching significance to achieve the goal of efficient utilization of clean fuel and solar energy.展开更多
Thermodynamics analysis was carried out for solar thermal receivers with different selective coatings.The relation between the energy conversion efficiency of a medium-high temperature solar thermal system,the spectra...Thermodynamics analysis was carried out for solar thermal receivers with different selective coatings.The relation between the energy conversion efficiency of a medium-high temperature solar thermal system,the spectral properties of selective coating and the operating temperature of the receiver were discussed.Furthermore,the relation between the optimum operating temperatures,the exergy efficiencies and the incident solar flux were analyzed for the traditional concentrating system and concentrating beam splitting system,respectively.According to the analysis results for the thermal receiver with blackbody surface and selective coatings,the optimum cutoff wavelength was obtained for the ideal selective coating.An analysis method for the optimum operating temperature calculation was developed for thermal receivers with selective coating.The optimum operating temperature for an actual selective coating was analyzed on the basis of the proposed theory.展开更多
基金supported by the National Basic Research Program of China ("973" Program), (Grantt No. 2010CB227305)the CAS Solar Energy Action Program (Grant No. CX2090130012)
文摘A novel hybrid solar concentrating Photovoltaic/Thermal (CPV/T) system with beam splitting technique is presented. In this system, a beam splitter is used to separate the concentrated solar radiation into two parts: one for the PV power generation and the other for thermal utility. The solar concentrator is a flat Fresnel-type concentrator with glass mirror reflectors. It can concentrate solar radiation onto solar cells with high uniformity, which is beneficial to improving the efficiency of solar cells. The thermal receiver is separated to the solar cells, and therefore, the thermal fluid can be heated to a relatively high temperature and does not affect the performance of solar cells. A dimensionless model was developed for the performance analysis of the concentrating system. The effects of the main parameters on the performance of the concentrator were analyzed. The beam splitter with coating materials Nb2O3 /SiO2 was designed by using the needle optimization technique, which can reflect about 71% of the undesired radiation for silicon cell(1.1m < 3m) to the thermal receiver for thermal utility. The performance of this CPV/T system was also theoretically analyzed.
文摘In this paper, we propose a thermal model of a hybrid photovoltaic/thermal concentration system. Starting from the thermal balance of the model, the equation is solved and simulated with a MATLAB code, considering air as the cooling fluid. This enabled us to evaluate some of the parameters influencing the electrical and thermal performance of this device. The results showed that the temperature, thermal efficiency and electrical efficiency delivered depend on the air mass flow rate. The electrical and thermal efficiencies for different values of air mass flow are encouraging, and demonstrate the benefits of cooling photovoltaic cells. The results show that thermal efficiency decreases air flow rate greater than 0.7 kg/s, whatever the value of the light concentration used. The thermal efficiency of the solar cell increases as the light concentration increases, whatever the air flow rate used. For a concentration equal to 30 sun, the thermal efficiency is 0.16 with an air flow rate equal to 0.005 kg/s;the thermal efficiency increases to 0.19 with an air flow rate equal to 0.1 kg/s at the same concentration. An interesting and useful finding was that the proposed numerical model allows the determination of the electrical as well as thermal efficiency of the hybrid CPV/T with air flow as cooling fluid.
基金the financial support from the National Key R&D Plan Intergovernmental International Science and Technology Innovation Cooperation Project(grant no.2019YFE0109700)the Foshan Science and Technology Innovation Team(grant no.1920001000052).
文摘Solar energy is considered to be one of the most promising renewable and sustainable energy sources.The efficient utilization of solar energy has become a major requirement to build a clean and efficient energy system and achieve the goal of carbon neutrality.The utilization of solar radiation mainly adopts two key technologies:concentrating photovoltaic(PV)and concentrated solar power(CSP).Currently,the cost of CSP with heat storage is about 9c/kWh(same as commercial PV systems)and is expected to drop to 5c/kWh by 2030.From a system level,this paper focuses on analyzing,a system for preparing clean solar fuel based on solar thermal fossil energy,the current mainstream concentrated solar thermal power generation system,the complementary utilization system coupled with multiple energy sources,and the efficient and economical multigeneration system.On the basis of this literature review,the key challenges and future development prospects for the application of concentrating solar energy systems are outlined.A concentrated solar utilization system needs to further improve efficiency and reduce costs in order to expand the scale and promote the market,it has far-reaching significance to achieve the goal of efficient utilization of clean fuel and solar energy.
基金supported by the National Basic Research Program of China("973" Project)(Grant No.2010CB227305)
文摘Thermodynamics analysis was carried out for solar thermal receivers with different selective coatings.The relation between the energy conversion efficiency of a medium-high temperature solar thermal system,the spectral properties of selective coating and the operating temperature of the receiver were discussed.Furthermore,the relation between the optimum operating temperatures,the exergy efficiencies and the incident solar flux were analyzed for the traditional concentrating system and concentrating beam splitting system,respectively.According to the analysis results for the thermal receiver with blackbody surface and selective coatings,the optimum cutoff wavelength was obtained for the ideal selective coating.An analysis method for the optimum operating temperature calculation was developed for thermal receivers with selective coating.The optimum operating temperature for an actual selective coating was analyzed on the basis of the proposed theory.
基金"Thirteenth Five-Year"Science and Technology Project of Jilin Provincial Department of Education(No.JJKH20181131KJ)Jilin Scientific and Technological Development Program(No.20190302124GX)+1 种基金Science and Technology Innovation Fund of Changchun University of Science and Technology(No.XJJLG-2018-02)Jilin Scientific and Technological Development Program(No.20200602055ZP)。
