How to set up a circulating water system?
Thread Content
I’m working on a circulating water system, and there’s a question I can’t figure out: if all the users of the circulating water stop using it, but the centrifugal pump continues to run anyway, will that cause any problems? How do you handle your circulating water? Or should a pressure tank be installed at the outlet of the centrifugal pump to create a constant-high-pressure system, using the pressure inside to control the start and stop of the pump? (The pump can also be equipped with an inverter.)
Typical circulating water systems are rarely configured as shown in the diagram you provided. In other words, there are usually two cooling systems: one uses cooling water as a coolant to cool other substances, while the other is used to cool the cooled water that has returned after circulation; for example, cooling towers serve this purpose. These two systems are often connected in series to form one system. Of course, there are also separate ones, which require two pumps. How to configure it depends on the flow rate and the cooling load requirements. The diagrams you drew are the individual systems mentioned earlier. A typical circulating water system involves adding a cooling tower to the return main, using the residual pressure from the pump to send water to the tower. But your water tank needs to be changed into a pool. With such a configuration, the circulating water generally enters the tower in its entirety; when the user reduces or shuts it down, a bypass valve installed on the main pipe must be opened to handle the situation. If users won’t stop using everything (turning this off and that on), it’s unnecessary. Generally, centrifugal pumps can be used under pressure buildup, and their power will automatically decrease.
1. I have a question: Where is the cooling device, and how does the circulating water dissipate heat? What about equipment such as cooling towers and refrigerators? 2. Method to prevent pressure buildup in the pump when there are no users: A return line can be added to the pump’s outlet pipeline leading to the water tank. If higher requirements are needed, a pressure relief valve can also be added to the return pipeline. This is a mechanical method. Electrical control can also be used to prevent the pump from starting and stopping.
Thank you for your interest. There are cooling towers available, but I wanted to ask about the pressure buildup issue with centrifugal pumps; that’s why the cooling towers aren’t shown in the diagram
There could be a short circuit in the inlet and outlet pipelines for the circulating water. Another solution is to reduce the frequency of the centrifugal pump. Additionally, if there are any unnecessary heat exchangers made of metal, they can remain switched on
Water supply points/equipment are generally equipped with bypass lines; by opening the bypass valve when the supply and return valves are closed, freezing can be prevented and pump collapse due to pressure can be avoided.
Centrifugal pumps can be used under pressure buildup, and variable frequency and pressure relief systems can be added when necessary
OP: There must be a short-circuit control.