New Constant Temperature Dehumidifying Heat Pump Dryer - Equipped with an external heat exchanger, it offers low-temperature dehumidification below ambient temperature. It can maintain constant dehumidification between 10-70°C in the drying room, suitable for drying seafood like sea cucumbers, squids, and shrimps, as well as materials requiring low-temperature dehumidification. Multiple models available for customization. Welcome to inquire and learn more.
Closed-loop Dehumidifier Dryer 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 hot 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 in a cycle to achieve continuous drying of the material.
Closed-loop dehumidification heat pump dryer, utilizing 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 ambient temperature, allowing for effective drying in both cold and humid regions while maintaining drying time and quality.
Principle of Heat Pump Dryer
The heat pump dryer operates based on the reverse Carnot principle, absorbing heat from the air and transferring it indoors to increase the drying room's temperature, thereby achieving material drying 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. It undergoes a pressurization and heating process inside the compressor (temperature reaching up to 115℃), then it enters the indoor unit to release the high-temperature heat to warm the air in the drying room. Simultaneously, it cools down and transforms into a liquid state. When it reaches the outdoor unit, the liquid rapidly absorbs heat and evaporates back into a gas state, while the temperature drops to -20℃ to -30℃. At this point, the air surrounding 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.
Hot Water 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℃ 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 (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
Suitable materials for use in the drying process primarily consist of 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 when dried using a heat pump.
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