2results 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.

The application relates to an LNG cold energy multi-user cascade utilization system based on a temperature level matching matrix and a control method thereof, which comprises an LNG multi-stage gasification shunt unit, a multi-user cold quantity distribution bus, a user cold end heat exchanger group, a sensing monitoring network and a temperature level matching matrix controller. Each temperature level section outputs a cold quantity mother pipe through a segmented heat exchanger, and an independently controllable valve serving as a matrix switching valve island is arranged at the intersection of the mother pipe and a user branch pipe. The controller takes the minimum square weighted sum of the deviation between the temperature level section center temperature and the user target temperature as the target, solves the temperature level matching matrix under the constraints of complete distribution in the same temperature level section and meeting the cold quantity demand of each user, and issues the opening degree of the valve according to the matrix elements. The control method comprises offline modeling, initial value solving, online collection, instruction issuing, deviation determination, matrix recalculation, buffer absorption, fault tolerance reconstruction and iterative optimization feedback. The temperature level-user distribution is sublimated into matrix optimization, and dynamic adaptability and fault tolerance are combined.