Abstract: Disclosed is a method for determining drying time of a clothes dryer. The method includes: establishing a database at least including a corresponding relationship between a temperature change rate in a drum and drying time in a controller of the clothes dryer; and inquiring the database according to a change rate of a temperature value in the drum in a drying process to obtain expected drying time, and displaying at least one of the expected drying time and remaining time.

Abstract: An air condenser and a clothes dryer. The air condenser includes condensing air ducts and a cooling pipeline arranged crosswise. The condensing air ducts include a first group of condensing air ducts and a second group of condensing air ducts, wherein air inlet ducts of the first group of condensing air ducts and air outlet ducts of the second group of condensing air ducts are at least partially arranged in a heat exchangeable manner; and air outlet ducts of the first group of condensing air ducts and air inlet ducts of the second group of condensing air ducts are at least partially arranged in a heat exchangeable manner.