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Geometric optimization model for the solar cavity receiver with helical pipe at different solar radiation |
Chongzhe ZOU1, Huayi FENG2, Yanping ZHANG3(), Quentin FALCOZ4, Cheng ZHANG2, Wei GAO2 |
1. School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China 2. China-EU Institute for Clean and Renewable Energy, Huazhong University of Science and Technology, Wuhan 430074, China 3. School of Energy and Power Engineering; China-EU Institute for Clean and Renewable Energy, Huazhong University of Science and Technology, Wuhan 430074, China 4. China-EU Institute for Clean and Renewable Energy, Huazhong University of Science and Technology, Wuhan 430074, China; PROMES-CNRS Laboratory, 7 rue du Four Solaire, 66120 Font-Romeu-Odeillo-via, France |
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Abstract In consideration of geometric parameters, several researches have already optimized the thermal efficiency of the cylindrical cavity receiver. However, most of the optimal results have been achieved at a fixed solar radiation. At different direct normal irradiance (DNI), any single optimal result may not be suitable enough for different regions over the world. This study constructed a 3-D numerical model of cylindrical cavity receiver with DNI variation. In the model of a cylindrical cavity receiver containing a helical pipe, the heat losses of the cavity and heat transfer of working medium were also taken into account. The simulation results show that for a particular DNI in the range of 400 W/m2 to 800 W/m2, there exists a best design for achieving a highest thermal efficiency of the cavity receiver. Besides, for a receiver in constant geometric parameters, the total heat losses increases dramatically with the DNI increasing in that range, as well as the temperature of the working medium. The thermal efficiency presented a different variation tendency with the heat losses, which is 2.45% as a minimum decline. In summary, this paper proposed an optimization method in the form of a bunch of fitting curves which could be applied to receiver design in different DNI regions, with comparatively appropriate thermal performances.
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Keywords
cylindrical cavity receiver
3-D numerical simulation
geometric optimization
direct normal irradiation
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Corresponding Author(s):
Yanping ZHANG
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Online First Date: 16 April 2019
Issue Date: 04 July 2019
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