关键词: 农特产品, 干燥, 热泵, 空气回热器, 能源利用率, 余热

Abstract: In this study, a heat pump drying system driven by a gasoline generator was proposed to solve the problem of the low utilization rate of the drying room and damage in the process of transportation. In order to investigate the technological economy of the system, the heat pump unit model, the working fluid charge model, the air circulation model, and the physical drying model were established. A simulation program of the heat pump drying system driven by a gasoline generator was coded. Based on the simulation models, the effects of the variation of environmental and operational parameters were investigated. The results showed that the air temperature and relative humidity were controlled accurately by switching the valves. When the ambient temperature is high, and relative humidity is low, the drying air has a higher hygroscopic capacity. The heating capacity of the condenser was 1.9-3.3 kW, the heating capacity of exhaust air was 1.5-2.2 kW. The energy efficiency was increased substantially by utilizing waste heat of exhaust air discharged from the drying chamber and generator. The system can heat up rapidly and recycle waste heat to achieve complementarity with an openloop heat pump drying system and a closedloop heat pump drying system. The research can provide theoretical guidance for the design and practical operation of the heat pump drying system driven by a generator.

Key words: special agricultural products, drying, heat pump, airair heat exchanger, energy utilization rate, waste heat