Regarding the issue with the circulating water return valve
Thread Content
Gentlemen, the temperature difference for heat exchange in circulating water heat exchangers is relatively small; therefore, I intend to use the supply valve to create throttling effects in order to increase this temperature difference. However, I’m not sure whether closing the supply valve or the return valve will help prevent the growth of microorganisms due to reduced flow rates. Please advise!
Firstly, the control of the heat exchanger cooling water valve should be done using the outlet valve. It is mainly to prevent uneven flow velocity across the cross-section of the cooling water. As for the issue of \"allowing microorganisms to grow,\" it falls under water treatment problems. If water treatment is inadequate, this problem will occur regardless of how control measures are implemented. For reference.
Does the flow rate increase or decrease when the Shangshui Gate is closed?
It depends on how you choose to proceed. Most standard controls are outlet valve controls for reference.
The advantage of controlling the return water valve is to ensure that the heat exchange tubes are always filled.
The heat exchanger is placed at a higher position to prevent the device from not filling up completely; it should be fine for heights below 10 meters, right?
It is essential to control the return water valve; failing to do so and instead controlling the supply water valve can result in significant pressure losses, which may lead to the accumulation of sludge in the circulating water and the formation of scale. On the other hand, having full pipes of water improves heat exchange. Pressure still has a significant impact
A small temperature difference in the heat exchanger indicates a decrease in its efficiency. Check the circulating water pressure at the inlet and outlet of the device, adjust the return water valve to ensure that the heat exchanger is operating with full flow, and verify whether there is any air blockage in the heat exchanger; also, remove any air from it! In the context of water treatment, adding one or two tons of sodium hypochlorite to the inlet drain piping of the heat exchanger can significantly improve the heat exchange efficiency!