Modification of the cooling water pipeline for the oil cooler of centrifugal air compressors

Increasing the pipe diameter can have a positive effect on the cooling performance for the following reasons: 1. **Hydrodynamics**: A larger pipe diameter reduces the flow resistance inside the pipes, allowing more cooling water to pass through the oil cooler and thereby improving the efficiency of heat exchange. 2. **Flow rate and heat exchange**: Although increasing the pipe diameter may reduce the local flow rate, the overall flow volume increases, which helps to enhance the amount of heat exchanged per unit time and thus improves the cooling effect. However, there are also some potential issues to consider: - **Interface limitations**: You mentioned that the diameter of the pipes at the cooler’s interface cannot be changed, which may limit the benefits that could come from altering the pipe diameter. If the pipe diameter at the interface is small, even if the diameter of the pipe at the far end increases, the flow rate through the interface remains limited. - **System matching**: Changing the pipe diameter may require re-evaluating the overall compatibility of the system, including the pumping capacity of the pump and the suitability of other components. Taking everything into account, changing the pipe diameter can be tried as an option, but it is recommended to conduct a detailed fluid dynamics analysis first or consult relevant technical experts to assess the actual effects of such a change and any other potential problems that may arise. If possible, optimizing the pump’s output or adding additional cooling circuits are also effective ways to improve cooling efficiency. .

The interface dimensions of the oil cooler have been determined, so making changes in this regard won’t have much effect. The heat exchange area of the oil cooler should be calculated; if there are no issues, then it is necessary to check for scaling and clean it if needed ； Reduce the cooling water temperature

Before selecting this device, it is configured according to the local climate conditions. If the cooling effect is not sufficient, it is advisable to contact the design firm or the equipment manufacturer to have the heat exchanger replaced; this is the best way to resolve the issue. Changing the pipe doesn’t help; for reference only.

As can be seen from the diagram, no valves are installed on the pipes of each cooler. Due to the different resistances of these coolers, there is a certain issue of flow deviation, which affects the heat exchange efficiency of the oil coolers. Especially in summer, it is recommended to install valves on the supply and return water pipes of the inter-stage coolers and the after-cooler in order to adjust the flow rate appropriately. Another approach is to provide a separate supply of cooling water for the oil cooler, using desalinated or softened water. Since the amount of cooling water used is relatively small, it has little impact on the system, and the cooling effect is excellent; the cooled water is then returned to the water tank or used as make-up water for the circulating water. Furthermore, the heat exchange tubes in the various coolers of centrifugal air compressors are usually quite small; it is recommended to install filters on the circulating water supply pipes, otherwise the coolers tend to get clogged easily, leading to overheating of the system.

Solve it by using a plate heat exchanger