Low-Temperature Dehumidifying Fruit Drying Oven: Product Overview and Working Principle
has developed this fruit drying oven based on low dew point dehumidification technology, designed to simulate the physical characteristics of northern winter's northwest wind. Through two-stage dehumidification, the machine generates cold, dry air with low temperature and humidity—an environment that maximizes preservation of materials' original shape, color, and flavor during drying. This makes it particularly ideal for heat-sensitive fruits and other items like aquatic products and Chinese herbal medicines that require low-temperature, slow drying, delivering exceptional results.
Core Functions and Operational Process
This series of heat pump low-temperature dehumidifying fruit drying ovens primarily provides heating, cooling, and dehumidification for the drying chamber. The operational cycle unfolds as follows:
Moist, hot air from inside the fruit drying oven is directed into the unit's return air duct and drawn into the system by a negative-pressure circulation fan. It first passes through the high-temperature side of the heat exchanger, where an initial temperature drop occurs while increasing the moisture-holding capacity per unit volume of air.
The air then undergoes a second cooling stage via the surface cooler, bringing its relative humidity close to the dew point temperature. A third cooling phase occurs as the air flows through the evaporator, triggering condensation and dehumidification. The condensed moisture is collected and drained away through the water tank and drainage pipe located at the bottom of the evaporator.
After dehumidification, the circulating air transforms into low-temperature, low-humidity drying air due to the condensation process. This air is channeled through ducts back to the low-temperature side of the full-effect heat exchanger, where heat exchange occurs between the high and low temperature air streams. This first heating stage warms the cold air while further reducing its relative humidity through heat recovery.
The air then passes through the condenser, which raises its temperature and lowers humidity levels further, bringing it to the precise temperature required for the fruit drying oven and forming hot, dry air. Finally, this conditioned air is drawn by a centrifugal fan and distributed back into the drying chamber to continue the fruit drying cycle.

Widly used in dry and extract the cell liquid from the roses, chrysanthemums, honeysuckle, gardenia, jasmine, American ginseng, Cistanche and many other chinese herbal medicines

The high temperature heat pump consists of compressor, condenser, throttling device and evaporator. The refrigerant absorbs air heat from the evaporator, transforming from low pressure liquid to steam, then pressurized into high temperature steam by the compressor. In the condenser, the refrigerant releases heat and condenses into high pressure liquid. The throttling device reduces pressure and temperature, completing the cycle that transfers low temperature heat to high temperature medium.