The design of the pipeline direction of the wire tube back condenser is the key to optimizing the refrigerant flow path. By rationally planning the layout, bending angle and connection method of the pipeline, the refrigerant can flow more smoothly in the coil and the heat exchange can be more sufficient, thereby improving the overall efficiency of the wire tube back condenser.
The pipeline direction must first conform to the phase change process of the refrigerant. When the refrigerant enters the wire tube back condenser, it is in a high-temperature and high-pressure gas state. As heat is released during the flow process, it gradually changes to a liquid state. According to this phase change characteristic, the pipeline direction will allow the gaseous refrigerant to flow through the upper area of the coil first. The space here is relatively open, which is convenient for the rapid diffusion of the gas and reduces the flow resistance; when the refrigerant begins to liquefy, the pipeline turns to the lower part and uses gravity to guide the natural flow of the liquid refrigerant to avoid the obstruction of the passage of the gaseous refrigerant due to liquid retention. This design of the direction that conforms to the phase change allows the refrigerant to maintain a reasonable flow rate in different states, creating conditions for efficient heat exchange.
The bending angle and curvature design of the pipeline affect the smoothness of the flow. At locations where the direction needs to be changed, the pipeline will bend with a large arc instead of a right-angle turn. This design can reduce the turbulence of the refrigerant at the bend, allowing the fluid to transition smoothly along the bend direction, and avoiding a sudden drop in flow rate due to excessive local resistance. The inner wall of the bend will remain smooth without uneven flaws to prevent the refrigerant from forming eddies here, ensuring that the flow path is continuous and smooth, allowing the refrigerant to be evenly distributed to each section of the coil, and avoiding the heat dissipation of local pipelines due to insufficient flow.
The combination of parallel and series connections of the pipeline can balance the refrigerant distribution of each section of the coil. For a wire tube back condenser with a large area, a single pipeline is difficult to cover the entire heat dissipation area. At this time, multiple sets of coils will be connected in parallel to allow the refrigerant to be divided into several paths from the inlet and flow through different coil sections at the same time, ensuring that each section has enough refrigerant to pass through, avoiding insufficient refrigerant flow at the end due to too long a pipeline. In areas where the heat exchange effect needs to be enhanced, a series direction is adopted to allow the refrigerant to flow through multiple sections of coils in sequence, prolonging the residence time in the area and fully releasing heat. This combination allows the refrigerant flow path to match the heat dissipation requirements and improve the overall heat exchange efficiency.
The high and low layout of the pipeline uses gravity to assist the flow of refrigerant. The density of gaseous refrigerant is relatively small and it flows upward naturally. The pipeline will set the inlet of high-temperature gaseous refrigerant at a high position to allow it to enter the coil in an upward trend; when the refrigerant gradually liquefies and the density increases, the pipeline will extend downward, using gravity to accelerate the flow of liquid refrigerant and reduce dependence on power. This high and low design makes the flow direction of the refrigerant consistent with its own gravity direction, reduces the flow resistance, and avoids the accumulation of liquid refrigerant at high places, ensuring that the gaseous refrigerant can smoothly enter each section of the coil.
The relative position of the pipeline and the heat sink will also affect the optimization of the refrigerant flow path. The direction of the pipeline will keep the coil and the heat sink in uniform contact, and each section of the pipeline can be fully wrapped by the heat sink. When the refrigerant flows in the pipeline, the released heat can be quickly transferred to the heat sink and then dissipated into the air. If the pipeline direction is messy and the contact with the heat sink is uneven, the heat of some pipelines cannot be dissipated in time, and the cooling rate of the refrigerant in these areas will slow down, affecting the phase change process. Reasonable direction design indirectly optimizes the flow state of the refrigerant by ensuring smooth heat transfer.
The design of the inlet and outlet position of the pipeline is the key to the starting point and end point of the flow path. The inlet will be set at one end of the coil so that the refrigerant can quickly enter the main pipeline to avoid uneven flow distribution caused by improper inlet position; the outlet is located at the lowest point of the coil to ensure that the liquid refrigerant after heat exchange can flow out completely and will not remain in the pipeline. The direction from the inlet to the outlet is a continuous streamline, without detours or turns, so that the refrigerant has the shortest path from entry to exit, reducing unnecessary flow distance and improving the refrigerant circulation efficiency per unit time.
The branching and confluence design of the pipeline can balance the flow of each branch. In a multi-branch coil system, the main pipeline will set symmetrical branch points at appropriate positions to allow the refrigerant to be evenly distributed to each branch. The length and direction of each branch are basically the same, ensuring that the flow resistance of each branch is the same, avoiding a branch with too little flow due to excessive resistance, or too much flow due to too little resistance. The confluence adopts a smooth transition design, allowing the refrigerants of each branch to converge smoothly here without mutual impact, ensuring the continuity of the overall flow, making the flow path of the refrigerant both dispersed and unified, and achieving efficient heat exchange.
