Heat pump drying system and control method thereof

Abstract

The invention provides a heat pump drying system and a control method thereof.The heat pump drying system comprises a drying chamber and further comprises a first heat pump circulation subsystem and a second heat pump circulation subsystem, the first heat pump circulation subsystem comprises a first condenser, a first evaporator and a second evaporator, and the first evaporator and the second evaporator are connected in parallel and can independently control refrigerant circulation; the second heat pump circulation subsystem comprises a third evaporator, a second condenser and a third condenser, wherein the second condenser and the third condenser are connected in parallel and can independently control circulation of refrigerants. According to the heat pump drying system and the control method thereof, the heat pump drying system can have the capacity of adjusting multiple condensation temperatures and multiple evaporation temperatures, the number of the heat exchangers participating in refrigerant circulation can be adjusted according to the actual temperature condition, the utilization rate of equipment is increased, and meanwhile the energy efficiency of the corresponding compressor can be improved.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, and in particular relates to a heat pump drying system and a control method thereof. Background technique [0002] Dryers are currently in great demand in the market, but most of them are coal-fired, electric heating, biomass boilers, etc. as heat sources. Not only is it more polluting to the environment, but also the energy utilization rate of the system is low. Heat pump drying has the characteristics of energy saving and environmental protection, but the energy efficiency of traditional heat pump dryers is not high, and the exhaust gas will pollute the environment. The traditional heat pump system is generally a single-stage compression refrigeration cycle, that is, there is only one stage of evaporation and compression. [0003] The heat pump drying system is usually a single single-stage compression heat pump system used in the drying system. This system has a single evaporation t...

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Problems solved by technology

[0004] Therefore, the present invention provides a heat pump drying system and its control method, which can overcome the single evaporation temperature and condensation temperature in the single heat pump system of the related art, which cannot meet the requirements of multiple condensation temperatures and evaporation temperatures, and the equipment utilization rate is not high. low energy efficiency

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