Full
Outline
In order to improve the heat transfer performance of the heat recovery device in the closed system of heat pump dryer，a heat recovery device with a convex structure （truncated cone‑shaped and cylindrical） was proposed.The influence of the shape and arrangement of the convex structure on the heat transfer performance was analyzed by the method of experiment and numerical simulation.The results show that when Re=542~1 692，the heat transfer enhancement multiples of Nutruncated cone/Nuplate and Nucylinder/Nuplate are 1.29~1.42 and 1.22~1.26，respectively，which are larger than those of smooth plate.The comprehensive thermal performance evaluation factor PEC of the truncated cone‑shaped convex heat recoverer is 1.09~1.15，which is better than that of the cylindrical convex structure with the same Re.The PEC of the staggered arrangement of the cone‑shaped convex heat collectors is 1.09~1.15.Among them，the PEC of Re=542~1 490 staggered arrangement is larger than that of grouping arrangement，and the comprehensive heat transfer performance of staggered arrangement is better.The research results provide a theoretical basis for the structural optimization of the heat recovery device of the heat pump dryer.
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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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