Full
Outline
To address the issue of insufficient model accuracy for the R290 heat pump dryer dehumidification evaporator under complex thermal and humid conditions，a combined simulation and experimental approach was employed to study the flow heat transfer characteristics and performance optimization of the evaporator.Based on the unique two‑phase flow and heat transfer characteristics of R290，the general in‑tube two‑phase flow heat transfer model and pressure drop model were modified，and a distributed parameter model for the evaporator applicable to the large temperature‑humidity span conditions of dryers was constructed.A heat pump dryer experimental platform was built to validate the model accuracy across a wide range of humid air conditions （temperature 20~65 ℃，relative humidity 20%~95%）.The average errors for temperature and humidity predictions were 1.8 K and 5.1%，respectively.The results indicate that the heat transfer coefficient reaches its maximum，approximately 110 W/（m2·K），when the refrigerant quality inside the tube is around 0.4.There exists a limit to the dehumidification and heat transfer capacity of the evaporator；when the superheat exceeds 10~12 K，further increases in load lead to insignificant improvement （less than 4%） in heat exchanger performance.The findings provide a theoretical basis for optimizing the design and operation control of R290 heat pump dryer evaporators and offer certain engineering value for enhancing equipment energy efficiency and operational reliability.
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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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