1results about How to "Reduce irreversible loss" patented technology

The invention relates to the technical field of refrigeration, heating and heat pumps, and discloses an ejector synergistic double-evaporator heat pump drying system and method for material drying. The system comprises an air circulation loop and a refrigerant circulation loop. Wet air at an outlet of the drying chamber is sequentially cooled and dehumidified by the high-temperature evaporator and the low-temperature evaporator in a stepped manner, heated by the condenser and then returned to the drying chamber; the refrigerant circulation loop comprises a compressor, a condenser, an auxiliary condenser, an ejector, a high-temperature evaporator, a gas-liquid separator, a throttling element and a low-temperature evaporator. According to the heat pump drying system, the high-temperature evaporator and the low-temperature evaporator are arranged to cool air in a stepped mode, the average evaporation temperature is increased, meanwhile, the ejector is introduced into a loop to recycle expansion work, irreversible loss in the throttling process is reduced, and therefore the efficiency of the heat pump drying system is improved; and saturated liquid at the outlet of the gas-liquid separator enters the low-temperature evaporator after being throttled, so that the dehumidification capability of the low-temperature evaporator is effectively improved.