Design and implementation of a 38 kW dish-Stirling concentrated solar power system

2017 International Conference on New Energy and Future Energy System

Yan, J.^1 ; Peng, Y.D.^1 ; Cheng, Z.R.^1 ; Liu, F.M.^1 ; Tang, X.H.^2

Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment, Hunan University of Science and Technology, Hunan Province Xiangtan

411201, China^1

Solar Business Department of Xiangtan Electric Manufacturing Group, Hunan Province Xiangtan

411101, China^2

关键词: Concentrated solar power;    Design and implementations;    Electricity efficiencies;    Flux distributions;    Net power outputs;    Parabolic dish concentrator;    Ray-tracing method;    Tracking performance;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/93/1/012052/pdf
DOI  :  10.1088/1755-1315/93/1/012052

来源: IOP

【 摘 要 】

Dish-Stirling concentrated solar power system (DS-CSP) is an important pathway for converting solar energy into electricity at high efficiency. In this study, a rated power 38 kW DS-CSP system was developed (installed in Xiangtan Electric Manufacturing Group). The heat engine adopted the alpha-type four cylinders double-acting Stirling engine (Stirling Biopower Flexgen S260). The absorber flux distribution simulation was conducted using ray tracing method and then the 204 m2parabolic dish concentrator system (diameter is 17.70 m and focal length is 9.49 m) with single concentrator plus single pillar supporting has been designed and built. A water-cooled disc target and an absorber imitation device were adopted to test the tracking performance of the dish concentrator system, homogeneity of the focal spot and flux distribution of the absorber. Finally, the S260 Stirling engine was installed on the focal position of the dish concentrator and then the net output power date of the 38 kW DS-CSP system was tested. The absorber overheating problem on the DS-CSP system performance was discussed when the DS-CSP system was installed in different locations. The testing result shows that this system achieved the net output power of 38 kW and solar-to-electricity efficiency (SEE) of 25.3% with the direct normal irradiation (DNI) at 750 W/m2. The net output power can further increase to 40.5 kW with the SEE of 26.6% when the DNI reaches up to the maximum of 761 W/m2. The net output power of the 38 kW DS-CSP system has a linear function relationship with the DNI. The fitting function is Net power output=0.1003 DNI36.129, where DNI is at the range of 460∼761 W/m2. This function could be used to predict the amount of the 38 kW DS-CSP system annual generation power.