Discussion on heat exchanger operation
Thread Content
How is the circulation volume of a circulating water heat exchanger adjusted? Is it done using the inlet valve for the circulating water or the return valve? What are the advantages and disadvantages of each method? And how should heat exchangers located at higher positions (where the pressure of the circulating water can be maintained) be adjusted? All sailors are welcome to discuss! Additional note: The supply pressure for the circulating water is 0.5 MPa.
Let’s offer some support first; I’m not sure how to answer this question either, so I’m looking forward to expert advice!
Reply 1# qiang_boy128: Generally, water supply is adjusted, and a thermometer is installed on the return pipeline to determine the load on the heat exchanger based on the temperature difference.
It seems we adjust it using the return valve; will the water supply be insufficient if we use the inlet valve?
The question asked is a bit... . . . Generally, it is the inlet valve that needs to be adjusted in order to control the flow rate; adjusting the outlet valve will cause the heat exchanger to become filled, failing to achieve the desired control effect. Moreover, the level of the circulating water cannot be adjusted using control valves – it is determined by the pressure at the circulating water station.
We all use inlet control valves for regulation, while our warm water system controls the water temperature by adjusting the opening degree of the warm water inlet and outlet valves in a stepwise manner.
We use return valves for adjustment (the main return valve in the return water network); the equipment is adjusted using inlet valves. Isn’t it strange? . . . . . . . . .
We use the return valve for adjustment; if the supply valve is used, it is difficult to fill the heat exchanger, which affects its heat exchange efficiency.
Keep the return valve fully open, and use the supply valve for adjustment to prevent pressure buildup in the heat exchanger after changes in thermal load.
We keep the supply valve fully open and use the return valve for adjustment; this prevents gas from remaining inside the heat exchanger, which could affect its heating efficiency. Since the heat exchanger is located at a high position, opening the return valve too much can create negative pressure inside it, which is not conducive to efficient heat exchange
In actual production, a return water valve should be used for adjustment for the following reasons: 1. To ensure that the heat exchanger operates within its designed steady-state conditions (pressure). 2. If water flow is adjusted by throttling before the heat exchanger, the low pressure may result in the heat exchanger not being filled properly