Removing moisture in the wet farm products through the open air ventilation is a traditional postharvest treatment method. However, its overall energy consumption is high and the drying time is long. Here, a combined system is proposed through integrating a bottom organic Rankine cycle (ORC) to a top closed farm products air drying cycle to save energy and decreasing the drying time. Based on a steady state thermodynamic model without any losses, a theoretical work on thermal performance the proposed system has been conducted. The key operation parameters and suitable operation conditions for both the prominent energy saving ratio and high moisture extraction characteristics have been analyzed. The calculation results showed both the prominent energy saving and high moisture extraction performances can be achieved at the low ORC evaporating pressure condition, but the optimal energy saving performance and the moisture extraction performance could not be achieved simultaneously. Increasing dew point temperature of the humid air leaving the drying chamber improves both the energy saving and moisture extraction performances of the drying system significantly. Under the working conditions in this research, with the dew point temperature value of the humid air leaving the drying chamber over 323 K, the optimal energy saving performance is achieved at a fixed low ORC evaporation pressure. But, the prominent energy saving and high moisture extraction performances could not be accomplished simultaneously, with the dew point temperature value of the humid air leaving the drying chamber lower than 323 K.

通过露天通风除去湿农产品中的水分是传统的收获后处理方法。但是，其总能量消耗高并且干燥时间长。在此，通过将底部有机朗肯循环（ORC）集成到顶部封闭农产品空气干燥循环中来提出一种组合系统，以节省能源并减少干燥时间。基于没有任何损失的稳态热力学模型，对所提出的系统进行了热性能的理论研究。分析了突出的节能比和高水分提取特性的关键操作参数和合适的操作条件。计算结果表明，在低ORC蒸发压力条件下，既可以实现显着的节能效果，又可以实现较高的除湿性能，但不能同时实现最佳的节能性能和除湿性能。离开干燥室的湿空气的露点温度升高，大大改善了干燥系统的节能和吸湿性能。在本研究的工作条件下，离开干燥室的湿空气的露点温度值超过323 K，在固定的低ORC蒸发压力下可获得最佳的节能性能。但是，突出的节能和高水分提取性能无法同时实现，