# US 9,518,353 B2 · Method for controlling drum type washing machine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,518,353 B2 - Document ID: US9518353B2 - Status: Granted - Kind: B2 - Application number: 14/168,855 - Filed: 2014-01-30 - Published: 2015-06-25 - Granted: 2016-12-13 - Earliest claimed: 2013-12-24 - Assignees: Dongbu Daewoo Electronics Corporation - Applicants: Dongbu Daewoo Electronics Corporation - Inventors: Sung Su Joo - Web page: https://patentgrep.com/patent/US9518353B2 ## CPC - D06F 58/24: Condensing arrangements - D06F 58/30: Drying processes (controlling a series of operations in domestic laundry dryers D06F58/32) - D06F 2103/38: Time, e.g. duration - D06F: LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES ## Abstract A method for controlling a drum type washing machine including a condensing duct configured to receive air from a tub, the method including supplying a first coolant into a storage unit in the condensing duct holding or maintain the first supply of the coolant in the storage unit; and supplying a second coolant into the storage unit after a preset or predetermined time period elapses is provided. The preset time period is shorter by a predetermined time length than an expected time period for thermal equilibrium between the coolant in the storage unit and the air in the condensing duct. ## Claims ### Claim 1 A method for controlling a drum type washing machine including a condensing duct configured to receive air from a tub, the method comprising: supplying a first coolant into a storage unit in the condensing duct, and holding or maintaining the first coolant in the storage unit; and supplying a second coolant into the storage unit after a preset or predetermined time period elapses, wherein the preset time period is shorter by a predetermined time length than an expected time period for thermal equilibrium between the coolant in the storage unit and the air in the condensing duct, wherein the method further comprises turning off a fan in a heating duct connected to one end of the condensing duct and the supplying the second coolant occurs after turning off the fan. ### Claim 2 (depends on 1) The method of claim 1, wherein the expected time period for thermal equilibrium is calculated from a temperature of the air in the condensing duct, a temperature of the coolant in the storage unit, a flow rate of the air in the condensing duct, a flow rate of the coolant supplied into the storage unit, a length of time during which the first coolant is supplied to the storage unit, and a specific heat of the coolant. ### Claim 3 (depends on 1) The method of claim 1, further comprising: holding or maintaining the second the coolant in the storage unit; and resupplying the coolant to the storage unit after holding or maintaining the second coolant, wherein the second coolant or the resupplied coolant replaces at least a portion of the coolant previously in the storage unit. ### Claim 4 (depends on 3) The method of claim 3, wherein the second coolant is supplied for a time period shorter than a time period during which the first coolant is supplied. ### Claim 5 (depends on 3) The method of claim 3, wherein the coolant is resupplied for a time period shorter than a time period during which the first coolant is supplied. ### Claim 6 (depends on 1) The method of claim 1, wherein the condensing duct comprises an inner tube through which the air flows, and an outer tube surrounding at least a section of the inner tube. ### Claim 7 (depends on 6) The method of claim 6, wherein the storage unit comprises a space between the inner tube and the outer tube. ### Claim 8 (depends on 6) The method of claim 6, wherein supplying the first coolant occurs until the storage unit fills with the coolant. ### Claim 9 (depends on 6) The method of claim 6, wherein at least a portion of the first coolant overflows into the inner tube from the storage unit when the second coolant is supplied to the storage unit. ### Claim 10 (depends on 1) The method of claim 1, further comprising turning off a heater while the fan is turned off. ### Claim 11 A method for controlling a drum type washing machine including a condensing duct having a partition wall that separates an air passage along which air from a tub flows, the method comprising: supplying coolant to a storage unit in the condensing duct; drying laundry in the washing machine for an initial preset time period during which a temperature of the coolant in the storage unit increases, and moisture in the air passage is condensed by heat transfer between the coolant and the air; and replacing at least a portion of the coolant in the storage unit with new coolant, wherein drying the laundry and replacing at least a portion of the coolant alternate, and a set time period for drying the laundry after replacing at least a portion of the coolant is equal to the initial set time period. ### Claim 12 (depends on 11) The method of claim 11, wherein the condensing duct is configured to be filled with coolant. ### Claim 13 (depends on 11) The method of claim 11, wherein the new coolant has a first volume less than a volume of the coolant in the initial supplying process. ### Claim 14 (depends on 11) The method of claim 11, wherein the set time period for drying the laundry after replacing at least a portion of the coolant is shorter than the initial set time period.