New model small-scale farmer dryer, closed-loop dehumidification type, stable operation in low-temperature conditions in the north, exhaust at the bottom and return at the top, available in 1-3P capacities, single drying capacity of 100-300kg, designed specifically for small-scale drying projects.
Closed-loop Dehumidifier Dryer Drying Principle
The closed-loop dehumidifying heat pump dryer is used in the drying process. Its 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 dehydration. This process repeats, achieving continuous drying of the material.
Closed-loop dehumidifying heat pump dryer, featuring a patented constant-temperature dehumidification 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 also guarantee drying time and effectiveness in cold and humid regions.
Principle of Heat Pump Dryer
The Heat Pump Dryer operates on the reverse Carnot principle, absorbing heat from the air and transferring it to the room, thereby raising 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 (indoor unit)——throttle valve——absorber (outdoor unit)——compressor, and other devices that form a closed-loop system (main unit + drying room).
The refrigerant circulates within the system under the action of the compressor. It undergoes a process of pressurization and temperature increase in the compressor (up to 115℃), then enters the indoor unit to release the high-temperature heat, warming the air inside the drying room. Meanwhile, it cools down and turns into a liquid state. When it reaches the outdoor unit, it rapidly absorbs heat and evaporates back into a gaseous state, with the temperature dropping 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, thereby heating the air inside.
Heat Pump Dryer Application Range
The heat pump dryer is suitable for a wide range of materials. Suitable materials mainly include 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 mushrooms (like mushrooms, wood ear), seafood (such as fresh oysters, scallops, etc.), bioactive products (such as cells, enzymes), tea, paper, and more.
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Drying Equipment Solutions
Materials suitable for drying mainly include a wide range of materials 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.
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