Full
Outline
To achieve the control objective of “on‑demand defrosting” for heat exchangers，a frost performance test rig was constructed.Image recognition technology was employed to study frost characteristics of finned heat exchangers under different face velocities，and changes in refrigeration capacity during dynamic frosting were analyzed.Results show that within a 1 h test period under identical air inlet temperature and humidity conditions：As wind speed increased from 0 m/s to 1 m/s and 2 m/s，frost accumulation gradually decreased.Frost blockage rates were 88.99%，74.93%，and 39.88%，with frost thickness at fin tips measuring 1.169 mm，0.729 mm and 0.321 mm respectively.Higher wind speeds reduced frost blockage rates，enhancing heat transfer capacity and increasing system refrigeration capacity.Lower wind speeds increased frost blockage rates，degrading heat transfer capacity and reducing refrigeration capacity.This study provides theoretical and technical support for achieving “on‑demand defrosting”.
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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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