CONTROL METHOD AND CONTROL DEVICE FOR VARIABLE-FREQUENCY AND VARIABLE-CAPACITY HEAT PUMP HOT-AIR DRYING SYSTEM

摘要

Disclosed are a control method and control device for a heat pump type double-circulation hot-air drying system, relating to a device for supplying or controlling air or gas for drying solid materials or products, and in particular to a control method and a control device for a heat pump type hot-air drying system. The control method comprises the following steps: configuring a temperature control parameter, and saving a pre-set temperature control curve parameter; detecting and monitoring an outlet air temperature, and the temperature and humidity of a drying room; dynamically adjusting a set temperature according to a pre-set temperature control curve; and selecting, according to a current set temperature, a double-circulation dynamic operation mode of a system. The control device uses a micro-processor to realise program control. By building an inner circulation loop for large-volume air circulation, the latent heat of condensation in a refrigerant is fully absorbed, so as to improve the basic air temperature. High-temperature hot air is produced by means of second heat exchange performed by an air supply circulation loop. Automatic adjustment of a double-path air volume is used to control an outlet air volume to guarantee the change requirements of an outlet air temperature and the temperature of the drying room. The reliability of a product can be guaranteed, and the purposes of improving the energy efficiency of a unit and reducing the energy consumption can be also achieved.