Water replenishment for hot water circulation system
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There is an existing hot water circulation system, and to maintain its temperature, it is necessary to supply additional hot water. Please analyze whether this water should be added before the pump or after it. Additional note: The circulatory system also includes a network of pipes to maintain equilibrium between inflow and outflow.
If there is a temperature control valve, it is better to add water after the pump, but ensure that the water supply has sufficient pressure head.
Yes, it’s sufficient to use a temperature interlock with a control valve~
It is appropriate to add fluid before the pump; if adding it after the pump, factors such as head pressure and flow direction must also be taken into consideration, which is troublesome
If adding hot water does not cause the temperature to exceed the pump’s operating limit, it is recommended to add the water before the pump, as this requires less pressure for the water supply.
Generally speaking, replenishment after the pump is better than replenishment before the pump, for two reasons: 1. It allows the flow rate through the pump to be reduced, thereby lowering the pump’s power consumption； 2. The injection of hot water into the pump’s inlet certainly has an impact on the pump’s operation, especially when the mixture of cold and hot water is uneven. Of course, the prerequisite for replenishing water behind the pump is that the pressure of the hot water must exceed the outlet pressure of the pump.
Adding fluid after the pump is better than adding it before the pump, as this reduces the flow rate through the pump and thus lowers its power consumption； Check whether the pump design is suitable for high temperatures to prevent damage to the pump.
Fill it into the tank in front of the pump, but take into account the net positive suction head.
Let me share my opinion: if the amount of fluid added is small compared to the flow rate, it will have little impact on the power consumption of the circulation pump before the addition pump is used; moreover, a lower head pressure is more advantageous； If the difference is not significant, it is better to supply water after the pump, but the head pressure should be matched. This post was last edited by polarbear501 on 2009-3-4 11:33]
The advantages are 1 the pressure required for replenishment is low, and 2 the pump itself is an excellent mixer.
Top up before the pump. According to the original poster, the water isn’t very hot; it’s probably the water used in the heating circulation system in order to maintain the desired temperature? So, after returning to the cycle, the temperature of the water naturally drops, and there is also some loss of water. By replenishing water before the pump, it is possible to ensure that the pump operates at full capacity, and the temperature will not cause any damage to the pump. It’s after all a hot water circulation pump, designed for pumping hot water; therefore, there should be no problems. However, the amount to be added needs to be calculated; if the volume is large and the water volume after mixing exceeds the pump’s capacity, then considering replacing it with a new, larger pump might be an option
What was said upstairs makes a lot of sense; one needs to make a choice based on the actual circumstances.
It mainly depends on the unit’s process flow and equipment condition to determine whether to supply water or add water after the pump.