稻谷热管辅助热泵除湿干燥技术

Rice Drying Using Heat Pump Dehumidifying System with Heat Pipe

摘要:

针对热泵除湿干燥系统因降温除湿致使干燥介质热空气温度偏低，影响稻谷干燥速率和能耗，在热泵蒸发器两侧设计一套分离式热管换热器，对环境空气进行预冷却和预加热，在不增加能耗的前提下，提高了热泵除湿系统的除湿量和干燥空气的温度。试验研究表明当环境温度为27℃、空气相对温度为60%~78%时，热管换热器对应降低除湿能耗28.4%~9.6%。在环境温度为26.2℃、空气相对湿度为80.2%时，热管辅助热泵除湿稻谷干燥能耗为1560kJ/kg，相对热泵除湿干燥系统节能18.2%。

Abstract:

The ambient air dehumidification needs cooling down the air temperature in conventional heat pump dehumidification system. However, it decreased the temperature of hot air to the grain dryer, which reduced rice drying rate and increased energy consumption at the same time. A heat pipe heat exchanger was installed on the two sides of evaporator of heat pump dehumidification system, which was used for pre-cooling and pre-heating of ambient air respectively, so that dehumidifying capacity can be enhanced and the hot air temperature can be increased. Experiential results showed that with heat pipe in the system, the energy consumption of dehumidification were reduced by 9.6%~28.4% when air relative humidity was 60%~78% at 27℃. Meanwhile, the results demonstrated that dehydrating 1kg water from rice consumed 1560kJ energy when inlet air with relative humidity of 80.2% at 26.2℃, and saved 18.2% of energy compared with traditional heat pump dehumidification system.