Articles: Cooling

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Main Block and Radiator Design and Functionality

The main block of the cooling system looks like a box with a meshed window on the front that fits into two five-inch bays of the system case:

The designers intended this window to serve for air intake by the 120-mm fan inside. The block is 232mm x 148.6mm x 85mm big.

Let’s take a look at this block from the top:

It consists of an aluminum radiator with a 120mm fan on top of it, an expansion tank and a pump. All components are connected with one another using hard plastic tubes:

The aluminum radiator is 153mm x 120mm x 28mm in size. Thermaltake engineers employed “Dimple Tube” technology for their radiator design. It implies that the internal radiator canals feature small grooves. This is what it looks like, according to the manufacturer:

These round grooves should create additional turbulence for the airflow, a solution we have already come across in a heatsink of the OCZ air cooler. It is hardly possible to check whether this solution improves heat dissipation, so all we can do is take the manufacturer’s word for it. I would like to add that the radiator is cooled with a 120mm x 120mm x 25mm fan with variable rotation speed and blue highlighting. The fan rotation sped can vary in the interval from 1600RPM to 2400RPM with the claimed noise level of 16-20dBA.

The expansion tank is 72.4mm x 70.5mm x 69.4mm big with 130ml capacity:

There is a plastic plug on top of it that can be opened to add coolant to the system. The two marks on the sides indicate the minimum and maximum levels of coolant in the system.

Thermaltake Big Water 760i is equipped with P500 pump with claimed maximum flow rate of 500 l/h (allowed deviation ±50 l/h). We managed to find some additional technical specs of the pump on the inside of it:

One of the most interesting ones is maximum head of 1.8m, which is not bad at all for a mass liquid-cooling system. The use of a ceramic bearing for the pump allowed the manufacturer to claim its MTBF of 80,000 hours which is more than 9 years. The level of generated noise is claimed to be 16dBA, but Thermaltake traditionally lowers this particular specification of their products, so we wouldn’t take it for granted right away.

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