It happens that you go to bed and cannot fall asleep from the periodic noise in the heating system.
"Radiator noise" - a hissing sound emitted when the coolant flow moves:
- in the transition part from larger to smaller pipe diameter;
- when an air pocket is formed;
- with an increase in resistance on any closing element.
If airing is removed by means of an air vent, then pressure is a little more difficult. Let's consider in detail the cause of the noise and the elimination option.
In every simple or complex radiator heating system, there is always a system resistance. According to the laws of physics, it is represented by the following graph:
The displayed system characteristics are certain conditions caused by an increase or decrease in the system resistance.
For an illustrative example, let's equate one covered thermal head (closed radiator) to characteristic No. 1. Then two overlapped thermal heads - characteristic 2, and three overlapped thermal heads, respectively - characteristic 3, etc.
According to the graph, we see that with each closed radiator the head of the system grows, which is confirmed in practice!
Now let's look at the schedule of the system characteristics along with the schedule of the pump at one of its speeds:
The pump curve intersects the characteristics of the heating system at certain points. The pump creates a constant head, thereby constant pressure in the system, and the shut-off valves regulate it. And at the marked point (conditionally), when there is a pressure drop across the valve assembly, the flow reaches a certain values, and with an increase in resistance in a certain interval - the moving coolant begins to emit a rumble sound or hiss.
How to get rid of noise?
The way out of the situation is actually simple. We need to stop increasing the pressure in the system further, at which the noise begins - by installing a bypass valveby adjusting it in such a way that at this (conditional) point it starts to open.
The valve system is primitive - when a certain pressure value is reached, the spring begins to compress, thereby ensuring the flow of the coolant and unloading the heating system as a whole.
The bypass valve is always installed before the first consumer (i.e. radiator) after the circulation pump - connecting the flow and return.
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