The main functions of a heat pump dryer

The heat pump drying unit has two main functions:

Heating: refers to the compressor heating, where Freon absorbs outdoor heat and releases it indoors through phase changes, achieving the effect of raising room temperature. At this time, indoor aquatic products, agricultural products, shiitake mushrooms, tea, wood, traditional Chinese medicine, tobacco, etc. absorb heat, and the moisture in the materials is released into the air, resulting in an increase in air humidity. The maximum temperature for heating cannot exceed 60 degrees.

Dehumidification: When the dehumidification function is turned on, the air is forced to circulate through the fan, and the moisture in the air comes into contact with the low-temperature fin surface of the evaporator. After alternating between hot and cold, the water vapor becomes water droplets and condenses on the fin surface,

Collect the water in the collection tray and discharge it to the outside. The dehydrated air is then heated by the condenser and discharged into the room by a fan, reducing humidity. At the same time, preheating continues to heat up the room. So back and forth.

The difference between heat pump dehumidification drying and traditional hot air drying lies in the different air circulation methods, as well as the different ways in which the air in the drying room is dehumidified. During the drying process of a heat pump, the air undergoes a closed cycle between the drying chamber and the heat pump dryer. It utilizes the refrigeration system of the heat pump dryer to cool and dehumidify the humid air from the drying chamber. When the humid air flows through the heat pump evaporator, the low-pressure refrigerant inside absorbs heat from the air, changing from liquid to gas. As a result, most of the condensed water is discharged from the air due to cooling. The low-pressure refrigeration steam from the evaporator is pressurized by the compressor and sent to the condenser. When the dehumidified dry and cold air flows through the condenser, the high-pressure refrigerant inside releases heat due to condensation, while the external air is heated into hot air and returns to the drying room to continue drying the required products. The high-pressure refrigerant flowing out of the condenser is depressurized by the expansion valve and then flows into the evaporator to continue the next cycle.

The heat pump dehumidification and drying cycle involves adding a heat exchanger in the heat pump dehumidification and drying machine, which lowers the temperature of the air entering the evaporator and increases the temperature of the air entering the condenser; The reheat cycle reduces the cooling capacity of the evaporator used for air cooling (ineffective cooling process), while increasing the cooling capacity used for cooling and dehumidification processes, resulting in an increase in the optimal evaporation temperature and dehumidification capacity for heat pump drying; Heat pump dehumidification drying with increased heat recovery cycle can save more than 30% energy compared to ordinary heat pump drying.

Some large enterprises purchase large dryers for the purpose of drying their products. Although some enterprises are small in scale, they also purchase large dryers in order to have better product disposal solutions. In reality, due to the limited number of uses, these enterprises do not need to purchase large dryers

If the daily usage is relatively small, purchasing a small dryer can fully meet the needs of daily production. Some users are concerned that such small products may lack functionality compared to large products, so they cannot dry the products owned by the company, or the drying effect is poor. In fact, there is no need to worry about this aspect. In terms of the drying effect of products, the effect of using small equipment is not fundamentally different from that of large equipment. The two are almost identical in terms of functionality, but small equipment has poorer processing ability compared to large equipment, and the volume of items that can be processed is smaller

From these characteristics, it can be seen that small dryers are still very good for use in enterprises. These products are of different sizes and have different price ranges. Generally, popular small products on the market are more affordable in terms of price, which is 1/5, or even 1/6 of the cost of large products. For enterprises, purchasing this type of small product saves more capital. Currently, there are many users who use this type of product, and the excellent quality of this product has been unanimously praised by many users. Small dryers have become an indispensable main drying equipment for many enterprises in China.