Abstract: According to an embodiment, a clothes care apparatus includes a tub; a water level sensor configured to detect a water level in the tub; a heat exchanger disposed above the tub; a nozzle configured to spray water to the heat exchanger; a water supply valve configured to open or close a water supply flow path for supplying water to the nozzle; a drain line configured to guide condensate water generated by the heat exchanger or the water sprayed by the nozzle to the tub; and a controller.

Abstract: Disclosed is a heat exchange system between an external plan such as a data center and a water treatment device of a sewage treatment plant. The present system includes a hot-air supply unit that supplies heat generated from the external plant to a reactor using microorganisms in the water treatment device, and a coolant supply unit that supplies treated water discharged from the water treatment device to the external plant as a coolant for heat dissipation of the external plant. It is possible to simultaneously solve various problems in terms of environmental and economic aspects by enabling complementary heat exchange between the external plant and the sewage treatment plant.