Full
LANG Shaohua, E-mail: 15702665005@163.com
Outline
In response to the problems of low energy utilization efficiency and the uncertain relationship between the drying rate and air volume regulation in traditional heat pump drying systems, this study proposes an intelligent heat pump drying system with a regenerator, which consists of a heat pump cycle subsystem and an air circulation subsystem. To enhance the drying rate and energy utilization efficiency of the system, models for the heat pump cycle, moisture production of materials, air temperature and humidity in the drying chamber, intelligent regulation of air volume ratio, and heat exchange in the air regenerator were constructed using MATLAB/Simulink. Based on the principle of energy conservation and with the constraint that the moisture production of materials is equal to the moisture removal rate, a method for regulating the air circulation temperature and humidity was established to achieve intelligent dynamic regulation of the ratio of return air to fresh air. Taking mushrooms as the drying object, the effects of temperature, humidity, and drying air velocity on drying characteristics and the ratio of return air to fresh air were investigated. The results show that when the ambient temperature increased from 15 ℃ to 35 ℃, the inlet temperature of the drying chamber also rose. To maintain the optimal drying efficiency of the system, the ratio of return air to fresh air gradually decreased from 7∶3 to 6∶4. When the ambient relative humidity decreased from 80% to 40%, the moisture production rate of mushrooms gradually increased, the return air volume increased, and the ratio of return air to fresh air gradually increased from 6∶4 to 7∶3. When the drying air velocity increased from 1 m/s to 3 m/s, the convective heat transfer was enhanced, the moisture production rate of mushrooms accelerated, and the optimal ratio of return air to fresh air increased synchronously from 5∶5 and approaches 7∶3. The comparison results show that reducing the ratio of return air to fresh air under high-temperature conditions and increasing it under low-humidity and high-velocity conditions are beneficial to maintaining a high-temperature and low-humidity environment in the air duct and promoting the evaporation of mushroom moisture. The research results can ensure that the heat pump drying system improves energy utilization efficiency while maintaining a high-temperature and low-humidity environment in the air duct to guarantee the optimal drying rate, providing theoretical and technical support for the intelligence and application of the heat pump drying system.
30
6
| 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 |
关闭全屏
