Eli5: how do cooling towers for power plants work?

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Plus if these plants are next to a body of water why would they need to cool down their water if they can use the water form that source?

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Anonymous 0 Comments

The water circulates from the engine to the radiator, a system of fans and tubes with a lot of exterior surface area. Heat moves from the hot water to the radiator, causing the water to cool off. The cool water then heads back to the engine. At the same time, a fan moves air over the outside of the radiator. The radiator warms the air, cooling itself off at the same time. In this way, the engine’s heat moves out of the cooling system and into the surrounding air. Without the radiator’s surfaces contacting the air and dispelling the heat, the system would just move the heat around instead of getting rid of it.

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