Closed-loop dehumidifier drying machine - Top exhaust model, top air exhaust, bottom air return, suitable for hanging material drying, available in 12P, 15P, 20P, 25P.
Closed-loop desiccant dehumidifier drying machine drying principle
Closed-loop dehumidifying heat pump dryers are used in the drying process. Their main principle is to use the heat pump compressor to work, repeatedly circulating and heating the warm air inside the drying room to absorb 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 dehydration. This process is repeated cyclically to achieve continuous drying of the material.
Closed-loop dehumidifying heat pump dryer, utilizing a 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 environmental temperatures. It can maintain drying time and effectiveness even in cold and humid regions.
Heat Pump Dryer Principle
Heat Pump Dryer Principle: The heat pump dryer operates using the reverse Carnot principle, absorbing heat from the air and transferring it indoors to raise the drying room's temperature, thereby achieving the drying of materials with the help of corresponding equipment. The heat pump dryer consists of a compressor——heat exchanger (indoor unit)——throttle valve——absorber (outdoor unit)——compressor, forming a closed-loop system (main unit + drying room).
The refrigerant circulates within the system under the action of the compressor. It undergoes a compression and heating process in the compressor (reaching up to 115℃), then enters the indoor unit to release the high-temperature heat to warm the air in the drying room. Simultaneously, it cools down and transitions to a liquid state. As it moves to the outdoor unit, the liquid rapidly absorbs heat, evaporates back to a gaseous state, and its temperature drops to -20℃ to -30℃. 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, thus heating the air in the drying room.
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, wood ear), 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 in 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.
Water Treatment Engineering Solutions
Water treatment engineering is widely used in various fields, such as industrial wastewater treatment, urban solid waste management, urban effluent outlet governance, and rural wastewater treatment. It not only helps protect the environment but also enhances the efficiency of water resource utilization and reduces resource waste.
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