duct 250 the air is suctioned into the drying duct 240 thorough the suction port 244 of the drying duct 240 the suctioned air is heated to a high temperature by using the drying heater 245 then an air circulating process is repeated so that the heated air is discharged into the receiving compartment 130 again through the discharge unit 243 and the discharge port 302 in the embodiment shown in fig4 5 the water tank 210 the steam generator 220 and the drain tank 230 are sequentially stacked due to this stacked structure space that the mechanical room 300 occupies is reduced and available space in the receiving compartment 130 is increased additionally according to above stacked structure the flow of water in the refreshing unit 200 falls naturally by means of gravity accordingly an additional device is not required for generating the flow of water in the refreshing unit 200 furthermore the overall size of the refreshing unit 200 is reduced fig6 is a schematic fluid flow diagram in which the remaining water in the water tank 210 is collected into the drain tank 230 through the steam generator 220 this will be described in more detail referring to fig6 water is supplied from a water supplying source to the water tank 210 and the supplied water is supplied to the steam generator 220 a control valve 215 is mounted between the water tank 210 and the steam generator 220 a water level sensor 225 is installed inside the steam generator 220 such.