New model small-scale farmer drying machine, closed-loop dehumidification type, stable operation in low-temperature conditions in the north, exhaust air with return air, 1-3P options available, single drying capacity of 100-300kg, designed specifically for small-scale drying projects.
Closed-loop Dehumidification Heat Pump Drying Machine Drying Principle
Closed-loop dehumidifying heat pump dryers are used in the drying process. The main principle is to use the heat pump compressor to work, repeatedly heating the hot air inside the drying room, absorbing moisture from the material. While the heat pump evaporator condenses and removes water, it also absorbs heat from the humid air, providing heat for drying and dehumidification. This process repeats to achieve continuous drying of the material.
Closed-loop dehumidifying heat pump dryer, utilizing constant temperature dehumidification patent technology, significantly increases dehumidification capacity compared to conventional heat pump dryers. The closed design ensures stable operation at low temperatures with minimal impact from ambient temperature, making it suitable for use in cold and humid regions while maintaining drying time and effectiveness.
Principle of Heat Pump Dryer
The heat pump dryer operates based on the reverse Carnot principle, absorbing heat from the air and transferring it to the room, thereby increasing the drying room's temperature and facilitating the drying of materials with the help of corresponding equipment. The heat pump dryer consists of a compressor—heat exchanger (internal unit)—throttle valve—absorber (external unit)—compressor, forming a closed-loop system (main unit + drying room).
The refrigerant circulates within the system under the action of the compressor. Inside the compressor, it undergoes a process of pressurization and temperature increase to as high as 115°C. It then enters the indoor unit to release the high-temperature heat, warming the air in the drying room, while it cools down and becomes a liquid state. As it moves to the outdoor unit, the liquid rapidly absorbs heat and evaporates back into a gas state, with the temperature dropping to -20°C to -30°C. At this point, the surrounding air around the heat absorber continuously transfers heat to the refrigerant. The continuous circulation of the refrigerant achieves the transfer of heat from the air to the drying room, thereby heating the air inside.
Heat Pump Dryer Application Range
The heat pump dryer is suitable for a wide range of materials. Mainly suitable materials for drying are those that can withstand temperatures between 20-80°C during the drying process, or materials that can tolerate higher temperatures but are more energy-efficient or safer to dry using a heat pump. Materials that have been extensively researched and applied include wood (such as oak), grains, seeds, edible fungi (such as mushrooms, Tremella), seafood (such as fresh oysters, scallops), bioactive products (such as cells, enzymes), tea, paper, and more.
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Drying Equipment Solutions
Appropriate materials for use with the drying process mainly include a wide range of materials that can withstand temperatures between 20-80°C during drying, or materials that can tolerate higher temperatures but are more energy-efficient or safer to dry using a heat pump.
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Water treatment engineering is widely used in various fields, including industrial wastewater treatment, urban solid waste management, urban effluent outlet treatment, and rural wastewater treatment. It not only helps protect the environment but also improves the efficiency of water resource utilization and reduces resource waste.
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