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The heat transfer efficiency of the solar air collector with smooth heat absorption plate is very low. Using artificial roughness on the absorption plate can interrupt the boundary layer and improve the heat transfer efficiency of the system. The improvement is made based on the rectangular artificial roughness, and a twodimensional simulation of the solar air collector with the rightangle hexagonal artificial roughness is performed using ANSYS FLUENT. The influence of artificial roughness spacing on heat transfer efficiency and flow characteristics in the specific Reynolds number range is discussed, and the thermohydraulic performance is evaluated under different working conditions. The governing equations are solved using the finite volume method and the transport equations of the turbulent kinetic energy and the turbulent dissipation rate are solved using the RNG kɛ turbulence model. The result show that the heat transfer characteristic of the system is significantly improved by the addition of the rightangle hexagonal artificial roughness compared to the smooth plate. The rightangle hexagonal artificial roughness with p = 10mm had the maximum THPP of 1.76 at Re=4000, which is 1.6 times the artificial roughness of the rectangle under the same geometric parameters.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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