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Cooling circuit scheme
Clicking on every element you can view an image of it.
This circuit is similar to a car engine cooling circuit with the difference that the water tank is open to the air and so it's internal pressure is the atmosphere's, the other main difference is that there is a noticeable height between the lower part and the hicher part of the circuit (around 60 cm).
As can be seen in the scheme the pump pushes water to the radiator, where it cools down, then goes to a manifold that distributes it to the elements to be cooled. Passes through all these elements and it's collected by a manifold that takes it back to the tank.
A simplified scheme:
In the liquid free surface there's atmospheric pressure, in the upper part of the circuit (that is where the elements to be cooled are located) it's atmospheric pressure minus the water column. That is to say, if there's a leak in the elements located in the upper part water does'nt go out: air tends to get in. This makes the system inherently safe.
To make water flow through the circuit, the pump increases it's pressure in one of its branches, if the chosen pump was very powerful it might make the pressure all over the circuit higher than atmospheric, but the one I used it's not so big.
It's asumed that if water falls on the motherboard you'll break it. It's not true, it may happen if there are short circuits but motherboards are covered by an isolating varnish so it's not easy that such damages happen (it can happen anyway). I've had some liquid spells on my motherboard and nothing happened.
Here some images of the cooling circuit assembled:
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