A two-phase flow heat exchange device having a plurality of heat exchange tubes for inflow of refrigerant and phase change, the fluid passages inside each heat exchange tube can be divided into a first section having a single section, and the cross-sectional area is smaller than the first section The second segment, and the ratio of the cross-sectional area of the first segment to the minimum cross-sectional area of the second segment is greater than 20 and less than the gas-liquid phase volume ratio of the refrigerant. Therefore, the refrigerant undergoes a phase change in the first section of the heat exchange tube, and enters the second stage when the refrigerant phase state is changed to a supercooled state to ensure that the refrigerant phase transition is complete and the required degree of subcooling is achieved. At the same time, the flow between the different heat exchange tubes will automatically approach the equilibrium, ensuring that the refrigerant can fully exchange heat in each heat exchange tube and complete the phase change before flowing out.

Generally, the refrigerating and air-conditioning equipment uses a refrigerant to flow through a closed refrigeration circuit of a compressor, a condenser, an expansion unit and an evaporator, wherein the refrigerant generates a gas phase and a liquid phase in the process of flowing through the condenser and the evaporator. The phase change, but the traditional condenser and evaporator can not ensure the complete phase change of the refrigerant after the output, and the pressure loss between different pipelines is uneven, which causes the flow and flow rate to be uneven, resulting in the overall heat exchange efficiency can not be completely Play. The traditional approach is to increase the heat exchange area, but the effect is relatively limited, and the equipment cost and volume will be greatly increased.
The main object of the present invention is to provide a two-phase flow heat exchange device which can automatically distribute the refrigerant to a uniform distribution and output after the refrigerant is completely phase-changed to achieve the required degree of subcooling, and the loss is minimized, and the benefit is maximized. Thereby, the refrigerant changes the phase change of the gas phase/liquid phase in the heat exchange tube, and reduces the pressure change caused by the phase change by the design of the reduction portion, thereby equalizing the flow rate entering each heat exchange tube. And to ensure that the refrigerant completely phase change and reach the required degree of subcooling before flowing out of the heat exchange tube. The main object of the present invention is to provide a two-phase flow heat exchange device which can automatically distribute the refrigerant to a uniform distribution and output after the refrigerant is completely phase-changed to achieve the required degree of subcooling, and the loss is minimized, and the benefit is maximized.

冷凍及空調設備用之冷凝器與蒸發器.製程中使用熱交換之設備均可使用本項技術(例如工具機機台冷卻或恆溫控制用)