REFRIGERATOR ICEMAKER MOISTURE REMOVAL AND DEFROST ASSEMBLY
An icemaker moisture removal and defrost assembly is provided in a refrigerator. Cooled refrigerant is provided to a refrigerant loop within an icemaker to cool an ice making cavity and a moisture removal portion of the icemaker. Moisture laden air from a refrigerator compartment is directed through airflow channels defined by a plurality of fins extending from the moisture removal portion of the icemaker, whereby moisture condenses on the fins in the form of ice. Dry air exiting the airflow channels is directed across an evaporator and back into the refrigerator compartment. During a defrost event, a heater within the icemaker is used to melt the ice formed on the fins. Alternatively, hot gas from a compressor is used to heat a refrigerant line flowing through the evaporator and/or the icemaker to melt ice formed on the evaporator and/or the icemaker during a defrost event.
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1. Field of the Invention
The present invention pertains to the art of icemakers and, more particularly, to a refrigerator icemaker assembly which removes moisture from refrigerator air.
2. Description of the Related Art
In a domestic refrigerator, moisture tends to be attracted to the surface of the evaporator, which is usually the coldest spot in the refrigerator. The frost that forms on the evaporator reduces airflow and impedes the refrigerator heat transfer process. Therefore, refrigerators typically require either manual or automatic removal of frost buildup periodically in order to function properly. One approach to removing frost utilizes an electric heater. However, this type of defrost system is energy intensive and undesirably increases the temperature in the freezer compartment. The use of electric heaters for the purpose of defrosting an evaporator further entails the use of accessories (defrost heater shield, etc.), which adds to the cost of the system and reduces useable space within the refrigerator. Therefore, there is seen to exist a need in the art for an alternative defrost system which is more energy-efficient and avoids the drawbacks associated with electric heater-type defrosting systems.
SUMMARY OF THE INVENTIONThe present invention is directed to a refrigerator including an icemaker moisture removal and defrost assembly. The moisture removal and defrost assembly includes an icemaking device having a moisture removal portion including a plurality of longitudinal fins defining a plurality of airflow channels located beneath an ice making cavity. A refrigerator airflow circuit circulates refrigerated air through the airflow channels before flowing across an evaporator. A refrigerant line connects the compressor, condenser, evaporator and icemaking device in series to cool the evaporator and the icemaking device. More specifically, the longitudinal fins of the moisture removal portion are cooled by the refrigerant line and any moisture in the refrigerated air is deposited on the longitudinal fins in the form of ice or frost. Thus, moisture that would otherwise condense on the evaporator is removed from the refrigerated air by the icemaking device.
Defrosting of the longitudinal fins may be performed either by a resistance heater adjacent the ice making cavity that can also be used for ice harvesting, by a hot gas defrost system, or a combination of both. When a hot gas defrost system is employed, hot gas from the condenser is supplied to the refrigerant line, whereby heated refrigerant flows through the icemaking device and melts any frost or ice accumulated on the moisture removal portion of the icemaking device.
Additional objects, features and advantages of the present invention will become more readily apparent from the following detailed description of preferred embodiments when taken in conjunction with the drawings wherein like reference numerals refer to corresponding parts in the several views.
With initial reference to
An airflow circuit within refrigerator 2 is generally indicated at 45 as will now be discussed with reference to
Direct contact icemaker 32 will now be discussed in more detail with reference to
Mounting brackets 66 may be provided for securing icemaker 32 to a support structure (not shown) or evaporator 36 in icemaking compartment 8. As best seen in
In another preferred embodiment depicted in
In accordance with another embodiment shown in
The manner in which refrigerant is circulated throughout a refrigeration system 100 in accordance with the present invention will now be discussed with reference to
A heat exchange portion 120 is positioned along refrigerant line 102 between icemaker 32 and compressor 20 and between condenser 18 and evaporator 36. More specifically, a first portion 122 of refrigerant line 102 carrying cool refrigerant from icemaker 32 to compressor 20 is aligned adjacent a second portion 124 of refrigerant line 102 carrying warm refrigerant from condenser 18 to evaporator 36. Optionally, refrigeration system 100 also includes a hot gas defrost system 130 having a hot gas line 132 fluidly connected to a condenser portion 134 of refrigerant line 102 and a compressor line 136 by a three-way valve 138. In use, when a defrost event is desired, a controller (not shown) opens three-way valve 138 such that hot gas from compressor 20 travels through hot gas line 132 to refrigerant line 102 prior to evaporator 36 to heat refrigerant within refrigerant line 102 flowing through evaporator 36 in order to melt any frost or ice accumulated on evaporator 36.
In an alternative embodiment, rather than utilizing heating element 44, the heating system utilized by icemaker 32 comprises a hot gas defrost system 130′ depicted in
In addition to other advantages referenced above, the present invention provides for about 1.1 cubic feet of additional usable freezer compartment space based on previous side-by-side models due to the ability to use a smaller evaporator in place of a conventional evaporator. Further, the heating systems of the present invention eliminate the need for a conventional evaporator defrost heater.
Although described with reference to preferred embodiments of the invention, it should be readily understood that various changes and/or modifications can be made to the invention without departing from the spirit thereof. For instance, although not shown, it should be understood that refrigerant loop 102 may be reconfigured to carry refrigerant to icemaker 32 before evaporator 36. In general, the invention is only intended to be limited by the scope of the following claims.
Claims
1. A refrigerator comprising:
- a cabinet including at least one refrigerated compartment;
- a compressor;
- a condenser;
- an icemaker moisture removal and defrost assembly including an evaporator and an icemaking device, the icemaking device including: a main body portion; a moisture removal portion including a plurality of longitudinal fins defining a plurality of airflow channels; and an ice making cavity; and
- an airflow circuit circulating refrigerated air through the plurality of airflow channels of the icemaking device and then across the evaporator such that moisture in the refrigerated air is deposited on the plurality of longitudinal fins prior to the refrigerated air reaching the evaporator.
2. The refrigerator of claim 1, further comprising:
- an icemaking compartment housing the icemaking device and the evaporator, the icemaking compartment including an air inlet channel adjacent the icemaking device and an air outlet channel adjacent the evaporator, with the air inlet channel and the air outlet channel being part of the airflow circuit.
3. The refrigerator of claim 2, further comprising a fan assembly within the icemaking compartment for driving the refrigerated air.
4. The refrigerator of claim 2, wherein the icemaking compartment is separated from the at least one refrigerated compartment by a mullion, and each of the air intake and the air outlet extends through the mullion.
5. The refrigerator of claim 1, further comprising:
- a refrigerant line connecting, in series, the compressor, the condenser, the evaporator and the icemaking device, wherein the refrigerant line extends through the icemaking device.
6. The refrigerator of claim 5, further comprising:
- an expansion device located in the refrigerant line between the condenser and the evaporator.
7. The refrigerator of claim 6, further comprising:
- a secondary expansion device located in the refrigerant line between the evaporator and the icemaking device.
8. The refrigerator of claim 5, wherein the refrigerator further comprises a hot gas defrost system including a hot gas line fluidly connected to the condenser and the refrigerant line, and a valve for selectively opening the hot gas line to provide hot gas from the condenser to the refrigerant line, whereby heated refrigerant flows through the icemaking device and melts any frost or ice accumulated on the moisture removal portion of the icemaking device.
9. The refrigerator of claim 1, wherein the icemaker further comprises a plurality of longitudinal fins on a side wall of the main body portion.
10. The refrigerator of claim 1, wherein the icemaking device further comprises a heater, adjacent the ice making cavity, producing heat for harvesting ice from the ice making cavity and defrosting the plurality of longitudinal fins.
11. The refrigerator of claim 1, wherein the plurality of longitudinal fins are comprised of a plurality of rows of fins offset from one another.
12. The refrigerator of claim 11, wherein the plurality of rows of fins includes increasing numbers of fins in each row such that air channeled through the plurality of airflow channels is increasingly restricted by the fins as it travels from an inlet side of the icemaking device to an outlet side of the icemaking device.
13. An icemaking device comprising:
- a main body portion;
- a moisture removal portion including a plurality of longitudinal fins defining a plurality of airflow channels; and
- an ice making cavity.
14. The icemaking device of claim 13, further comprising:
- a refrigerant loop having portions extending along the moisture removal portion and the ice making cavity.
15. The icemaking device of claim 13, further comprising a plurality of longitudinal fins on a side wall of the main body portion.
16. The icemaking device of claim 13, further comprising a heater, adjacent the ice making cavity, producing heat for harvesting ice from the ice making cavity and defrosting the plurality of longitudinal fins.
17. The icemaking device of claim 13, wherein the plurality of longitudinal fins are comprised of a plurality of rows of fins offset from one another.
18. A method for ice making and moisture removal within a refrigerator comprising:
- providing cooled refrigerant to a refrigerant loop in an icemaking device, wherein the refrigerant loop includes portions extending along an ice making cavity and a moisture removal portion;
- directing refrigerated air through airflow channels defined by a plurality of longitudinal fins extending from the moisture removal portion of the icemaking device, whereby moisture in the refrigerated air condenses on the plurality of longitudinal fins in the form of ice; and
- heating the longitudinal fins to melt the ice formed on the plurality of longitudinal fins.
19. The method of claim 18, wherein heating the longitudinal fins comprises activating a heating element located adjacent the longitudinal fins.
20. The method of claim 18, wherein heating the longitudinal fins comprises providing a heated refrigerant to the refrigerant loop in the icemaking device.
Type: Application
Filed: Apr 14, 2010
Publication Date: Oct 20, 2011
Applicant: WHIRLPOOL CORPORATION (BENTON HARBOR, MI)
Inventors: TUSHAR KULKARNI (SAINT JOSEPH, MI), GUOLIAN WU (SAINT JOSEPH, MI)
Application Number: 12/759,770
International Classification: F25B 41/00 (20060101); F28F 7/00 (20060101); F25C 5/08 (20060101); F25B 1/00 (20060101); F25B 47/00 (20060101);