【摘要】 在已开发的热泵流化床谷物干燥设备研究基础上对其中的热泵进行了实验研究,得出干燥实验系统热泵供风温度以及供热系数的影响因素及其影响规律.通过对实验结果进行细致的理论分析,发现增大蒸发器回路风量与降低冷凝器出口风温可以显著改善热泵性能.依此拟定了热泵改进方案,预测了改进后热泵的性能指标,分析比较了相应干燥系统的经济效益.结果显示,改进后的热泵供热系数可达到3.856,干燥费用进一步降低.更多还原

【Abstract】 Based on the heat pump assisted fluidized bed grain drying equipment developed recently, a experimental analysis of the heat pump was performed. The influencing factors and their effects on the temperature of air outflow from the condenser and the coefficient of performance of the heat pump in a drying experimental system were gained from the experimental results. Coupled with corresponding theoretical analysis, it was found out that the higher the flow quantity through the evaporator and the lower the outlet temperature of the condenser, the better performance the heat pump can achieve. According to those results, a plan to improve the heat pump drying system was set up, and the performance quality of the improved heat pump and its corresponding economic evaluation of the drying system were predicted. It was shown that the improved heat pump can achieve its COP up to about 3.856, and the cost drying reduced sharply.更多还原