A heat exchanger is a component that is able to maintain equipment temperature effectively. Several efforts have been made so that the heat exchanger can work more efficiently, one of which is highlighted in this research, namely the use of AC wastewater as a liquid in the heat exchanger. AC waste water will flow inside the air cooler generator to cool the walls of the fins so that the temperature of the air passing through the air cooler generator becomes lower. The water cycle will continue to rotate so that the temperature of the flowing water can be maintained. The average values for the heat transfer rate for regular water are 3097.8 J/s, while for AC wastewater, it is 2937.9 J/s. So it can be concluded that AC waste water can be used as cooling water.

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