It mainly consists of four parts: a finned evaporator (outdoor unit), a heat pump main unit, a finned condenser (indoor unit), and an expansion valve. It works by continuously cycling through a thermodynamic process: evaporation (absorbing heat from the outdoor environment) → compression → condensation (releasing heat in the indoor drying chamber) → throttling → re-evaporation. This transfers heat from the low-temperature external environment to the drying chamber. The refrigerant circulates within the system under the action of the compressor.
Inside the compressor, the refrigerant undergoes a pressurization and heating process (up to 100℃). It then enters the indoor unit, releasing high-temperature heat to heat the air in the drying chamber, while simultaneously being cooled and condensing into a liquid state. When it reaches the outdoor unit, the liquid rapidly absorbs heat and evaporates, returning to a gaseous state, with the temperature dropping to -20℃ to -30℃. At this point, the surrounding air continuously transfers heat to the refrigerant.
Closed-loop dehumidifying heat pump dryer are used in the drying process. Their main principle is to utilize a heat pump compressor to repeatedly circulate and heat the hot air within the drying chamber, absorbing moisture from the material. Simultaneously, the heat pump evaporator condenses and removes water, absorbing heat from the humid air to provide the necessary heat for drying and dehydration. This cycle is repeated until the material is continuously dried. Fully closed-loop heat pump drying chambers are less affected by the external temperature and humidity of the environment.
When a high-temperature heat pump dryer is working, it works similarly to ordinary air conditioners and heat pump units. It absorbs energy (QA) from the low-temperature environment in the evaporator; it also consumes some energy (QB) through the compressor; and it releases heat (QC) in the condenser via the working fluid circulation system. Since QC = QA + QB, the efficiency of the high-temperature heat pump dryer is (QB + QC) / QB. The heating efficiency of other heating equipment is less than 1. Therefore, the heating efficiency of the high-temperature heat pump dryer is much higher than that of other heating equipment. This demonstrates that using a high-temperature heat pump dryer as a drying device can save energy and reduce emissions of pollutants such as CO2, achieving energy conservation and emission reduction.
HOME
PRODUCTS
CONTACTS