Method for drying laundry in a laundry treating appliance

Patent metadata

Field	Value
Publication number	US-11674252-B2
Application number	US-202017080151-A
Country	US
Kind code	B2
Filing date	Oct 26, 2020
Priority date	Mar 20, 2015
Publication date	Jun 13, 2023
Grant date	Jun 13, 2023

Abstract

A method of drying laundry in a laundry treating appliance having a treating chamber in which the laundry is received for drying comprises moving the treating chamber to redistribute the laundry, supplying air to the treating chamber to define a supply air flow, exhausting the supplied air from the treating chamber to define an exhaust air flow, actuating a heater at full output to heat the air supplied to the treating chamber, turning the heater off, and maintaining a maximum evaporation rate for a duration of time by operating the heater.

First claim

What is claimed is:

1. A method of drying laundry in a laundry treating appliance having a treating chamber in which the laundry is received for drying, the method comprising:
moving the treating chamber to redistribute the laundry;
supplying air to the treating chamber to define supplied air;
exhausting the supplied air from the treating chamber to define an exhaust air flow;
actuating a heater at full output to heat the air supplied to the treating chamber until a maximum evaporation rate is met to define a first phase;
turning the heater off; and
maintaining the maximum evaporation rate during a second phase for a duration of time by operating the heater.

2. The method of claim 1 wherein the heater is turned off for a predetermined time.

3. The method of claim 2 wherein the second phase is defined by at least one on cycle where the heater is on and at least one off cycle where the heater is off.

4. The method of claim 3 wherein the at least one off cycle defines an off time, and the at least one on cycle defines an on time.

5. The method of claim 3 wherein the off time is based on the predetermined time, which is a function of at least one of a mass of the laundry treating appliance, a mass of the laundry, or a laundry type.

6. The method of claim 4 wherein the on time corresponds to time it takes for a temperature of the exhaust air flow to reach a predetermined trip temperature.

7. The method of claim 6 wherein the at least one on cycle includes at least two on cycles and the at least one off cycle includes at least two off cycles, wherein a second of the two on cycles is shorter than a first on cycle.

8. The method of claim 6 wherein the predetermined trip temperature is below a maximum temperature reached during the first phase.

9. The method of claim 1 wherein the maximum evaporation rate is met when a maximum evaporated threshold value related to a temperature of the exhaust air flow is satisfied or a maximum evaporated threshold value related to a rate of change of a temperature of the exhaust air flow is satisfied.

10. The method of claim 9 wherein the maximum evaporation threshold value is satisfied when a temperature of the exhaust air flow levels off.

11. The method of claim 10 wherein the temperature of the exhaust air flow levels off when a time rate of change of the exhaust air flow drops below a predetermined rate.

12. The method of claim 9 wherein the maximum evaporation threshold value is satisfied upon a passing of a predetermined time experimentally determined to provide the maximum evaporation rate for a given load of the laundry and the full output of the heater.

13. The method of claim 1 wherein the second phase continues until a predetermined moisture percentage level is satisfied.

14. The method of claim 13 wherein the predetermined moisture percentage level is satisfied when a time of the heater being cycled on during the second phase is below a predetermined time threshold.

15. The method of claim 1 wherein the actuating the heater at full output comprises actuating a heater having multiple output levels at one of the output levels.

16. A laundry treating appliance for drying laundry according to a cycle of operation, comprising:
a rotatable drum at least partially defining a treating chamber;
a supply air conduit fluidly coupled to the treating chamber;
an exhaust air conduit fluidly coupled to the treating chamber;
a fan fluidly coupled to the supply air conduit, treating chamber, and exhaust air conduit to pass air from the supply air conduit, into the treating chamber, where it is exhausted through the exhaust air conduit to define an exhaust air flow;
a heater thermally coupled to the supply air conduit to heat the air in the supply air conduit; and
a controller operably coupled to the heater and the fan and configured to supply air to the treating chamber and heat the supplied air by actuating the heater during a first phase and a second phase following the first phase, wherein the controller is adapted to operate the heater at full output to heat the air supplied to the treating chamber until a maximum evaporation rate is met to define a first phase, turn the heater off, and maintain the maximum evaporation rate during a second phase for a duration of time by further operating the heater.

17. The laundry treating appliance of claim 16 wherein the heater is actuated at full output until a maximum evaporation rate is met by meeting a maximum evaporated threshold during the first phase.

18. The laundry treating appliance of claim 17 wherein the heater is cycled on and off during the second phase until a predetermined trip temperature of the exhaust air flow is satisfied.

19. The laundry treating appliance of claim 16 wherein the controller is further configured to turn the heater off for a predetermined time between the first and second phases, and during at least a portion of the second phase, wherein the predetermined time is based on at least one of a mass of the laundry treating appliance, a mass of the laundry, or a laundry type.

Assignees

• Whirlpool Co

Inventors

• Carow James P
• Mukhtar Moeed
• Tamanna Sanjida

Classifications

• D06F2103/32

  Temperature · CPC title

• Y02B40/00

  Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers · CPC title

• D06F2101/02

  Characteristics of laundry or load · CPC title

• D06F58/40

  Control of the initial heating of the drying chamber to its operating temperature · CPC title

• D06F2105/28

  Electric heating · CPC title