The present invention generally relates to the field of refrigeration and more specifically relates to refrigerators employing dual evaporator systems.
According to one aspect of the present invention, a cooling system for use in a refrigerator is provided and includes: a first cooling loop having a compressor configured to compress coolant, a condenser operably connected to the compressor, a valving system operably connected to the condenser and configured to selectively provide coolant to a first evaporator thermally connected with a first refrigerator compartment and a second evaporator thermally connected to a second refrigerator compartment; and a secondary cooling loop in non-fluid contact with the first cooling loop and having a reservoir that is thermally connected to the first evaporator and stores a liquid thermal storage material that receives excess cooling capacity from the first evaporator, a heat exchanger thermally connected to a feature positioned within the first compartment, and a pump operably connected to the reservoir that pumps the liquid thermal storage material to the heat exchanger to provide cooling to the feature.
According to another aspect of the present invention, a cooling system for use in a refrigerator is provided and includes: a first cooling loop having a compressor configured to compress coolant, a condenser operably connected to the compressor, a valving system operably connected to the condenser and configured to selectively provide coolant to a first evaporator thermally connected with a fresh food compartment and a second evaporator thermally connected to a freezer compartment; a secondary cooling loop in non-fluid contact with the first cooling loop and having a reservoir that is thermally connected to the first evaporator and stores a liquid thermal storage material that receives excess cooling capacity from the first evaporator, a heat exchanger thermally connected to a feature positioned within the fresh food compartment, and a pump operably connected to the reservoir that pumps the liquid thermal storage material to the heat exchanger to provide cooling to the feature; and a controller configured to control the flow of coolant through the first evaporator to thereby control the cooling provided to the liquid storage thermal material stored in the reservoir.
According to another aspect of the present invention, a cooling system for use in a refrigerator is provided and includes: a first cooling loop having a compressor configured to compress coolant, a condenser operably connected to the compressor, a valving system operably connected to the condenser and configured to selectively provide coolant to a first evaporator thermally connected with a fresh food compartment and a second evaporator thermally connected to a freezer compartment; a secondary cooling loop in non-fluid contact with the first cooling loop and having a reservoir that is thermally connected to the first evaporator and stores a liquid thermal storage material that receives excess cooling capacity from the first evaporator, a heat exchanger thermally connected to a feature positioned within the fresh food compartment, a pump operably connected to the reservoir that pumps the liquid thermal storage material to the heat exchanger to provide cooling to the feature, and a bypass circuit configured to selectively provide the liquid thermal storage material to at least one of the plurality of heat exchangers while bypassing the other of the plurality of the heat exchangers in instances where a thermal demand arise in at least one of the plurality of features; and a controller configured to control the flow of coolant through the first evaporator to thereby control the cooling provided to the liquid storage thermal material stored in the reservoir.
According to another aspect of the present invention, a method for providing cooling to a feature positioned in a fresh food compartment of a refrigerator is provided and includes the steps of: providing a first cooling loop having a compressor that compresses coolant, a condenser operably connected to the compressor, and a valving system that selectively provides coolant to a first evaporator thermally connected to the fresh food compartment and a second evaporator thermally connected to a freezer compartment of the refrigerator; providing a secondary cooling loop in non-fluid contact with the first cooling loop and having a reservoir thermally connected to the first evaporator that stores a liquid thermal storage material and a heat exchanger thermally connected to the feature; cooling the liquid thermal storage material with the excess cooling capacity from the first evaporator; pumping the liquid thermal storage material to the heat exchanger to provide cooling to the feature; and using a controller to control the flow of coolant through the first evaporator to thereby control the cooling provided to the liquid thermal storage material stored in the reservoir.
These and other aspects, objects, and features of the present invention will be understood and appreciated by those skilled in the art upon studying the following specification, claims, and appended drawings.
In the drawings:
As required, detailed embodiments of the present invention are disclosed herein. However, it is to be understood that the disclosed embodiments are merely exemplary of the invention that may be embodied in various and alternative forms. The figures are not necessarily to a detailed design and some schematics may be exaggerated or minimized to show function overview. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a representative basis for teaching one skilled in the art to variously employ the present invention.
Referring now to
As shown in
Refrigerator 2 may include one or more evaporators that provide cooling capacity to independently maintain compartments 6 and 8 at selected temperatures. For example, a first evaporator 26 may be configured to provide cooling of the fresh food compartment 6 and a second evaporator 28 may be configured to provide cooling of the freezer compartment 8. The evaporators 26 and 28 need not necessarily be positioned in the respective compartments 6 and 8 to provide cooling to the same and can be positioned in other suitable locations of the refrigerator 2. Since compartments 6 and 8 typically operate at different temperatures, each evaporator 26, 28 is adapted to provide cooling based on the thermal demands of each respective compartment 6, 8. In some instances, the first evaporator 26 may provide a surplus cooling capacity relative to the requirements of compartment 6. In prior systems, surplus cooling capacity may produce unwanted temperature fluctuations in a fresh food compartment. As a result, in prior known systems, it may be difficult to provide efficient thermal regulation because an evaporator having excess cooling capacity cannot be consistently operated a desired temperature.
Referring now to
A controller 99 may be operably connected to temperature sensors 100a and 100b in compartments 6 and 8, respectively. The controller 99 may be configured to selectively open damper 54 to selectively permit air flow between compartments 6 and 8 according to predefined criteria. For example, controller 99 may be operably connected to thermostats 101a and 101b in compartments 6 and 8, respectively. If the measured temperatures of compartments 6 and 8 are sufficiently different than the control temperature settings of thermostats 101a and 101b, and if a temperature differential exists between compartments 6 and 8, controller 99 may open damper 54 to permit air flow (e.g. heat transfer) between compartments 6 and 8 to cause the temperature to shift to/towards the control temperatures.
The coolant exiting the first evaporator 26 flows through a first suction line 56 to a junction 60 and coolant exiting the second evaporator 28 flows through a second suction line 58 to junction 60. Coolant from the first and second suction lines 56 and 58 flows through junction 60 and then to the compressor 36 via a third suction line 62 connected to the junction 60 outlet. Junction 60 may comprise a second three-way valve 64 that selectively controls the flow of coolant from suction lines 56 and 58 to the third suction line 62. Three-way valve 64 may comprise a powered unit that is operably connected to controller 99. Alternatively, the first and second suction lines 56, 58 may feed directly into a dual suction compressor.
The first portion 32A of first cooling loop 32 is thermally connected to a secondary cooling loop 66 of the fresh food compartment 6 by evaporator 26. The secondary cooling loop 66 is not fluidly connected to the first cooling loop 32. Evaporator 26 provides for heat transfer between the coolant of first cooling loop 32 and the liquid circulating in the secondary cooling loop 66. Liquid is stored in a reservoir 70 that is thermally connected to evaporator 26 and receives excess cooling capacity from evaporator 26. A pump 72 is operably connected to the reservoir 70 and pumps cooled liquid to any number of heat exchangers (shown as three heat exchangers 78a, 78b, and 78c in
Features 68a, 68b, and 68c, in addition to other features presented in subsequent embodiments may include the compartmental areas 12, and/or the modules 16 of the fresh food compartment 6, such as a quick chill or deep chill module and may be provided throughout the fresh food compartment 6 including door 10A. Thus, with the presence of the secondary cooling loop 66, the placement of features 68a, 68b, 68c, and subsequently presented features do not directly depend on the location of the first evaporator 26. As a result, the first evaporator 26 may be positioned such that it takes up less space in the refrigerator, thereby providing space saving opportunities relative to the volume and/or space typically available to refrigeration configurations. Furthermore, the use of the secondary cooling loop 66 to fulfill cooling needs temporarily relieves the compressor 36 from having to circulate coolant to the first evaporator 26 thereby reducing the possibility of overcooling and excess energy usage. For example, in use, controller 99 may cause three-way valve 42 to temporarily stop flow of coolant through first portion 32A of first cooling loop 32, while causing coolant to continue to flow through second portion 32B of first loop 32. Compressor 36 thereby continues to cool compartment 8, and compartment 6 is cooled by liquid circulating through secondary cooling loop 66 due to pump 72. The thermal capacity of the liquid of secondary cooling loop 66 permits significant cooling of compartment 6 even if evaporator 26 is not continuously cooling the liquid of secondary cooling loop 66. As a result, the refrigerator cooling system 30 disclosed herein is “Smart Grid friendly.” For example, the refrigerator cooling system 30 may be configured to operably connect with an electrical grid that uses information and communication technology to gather and act on information, such information typically including information about behavior of suppliers and customers.
Referring now to
When a cooling need arises, the cooled liquid thermal storage material in reservoir 70 is pumped through a supply line 76 to heat exchangers 78a, 78b, and 78c. In the embodiment of
For exemplary purposes, heat exchangers 78b and 78c may be provided in a second and third section B, C of the fresh food compartment 6. Upon completion of each cooling pass, the liquid thermal storage material returns to reservoir 70 via a return line 97 to receive cooling from the first evaporator 26 if needed. Thus, employing a circuit with bypassing capabilities ensures that liquid thermal storage material is only circulated when one or more features 68a, 68b, 68c require cooling. From this, more advanced cooling schemes can be devised based on the thermal demands of features 68a, 68b, and 68c. For example, the cooling process may be prioritized in an order of increasing thermal demands, such that in instances where more than one feature requires cooling, the feature with the highest thermal demands wins out and is first to receive cooling.
To assist with the cooling process, a variety of heat exchanger arrangements can be contemplated. For example, heat exchangers 78a, 78b, and 78c can be connected in series, in parallel, or in series and parallel combinations depending on the desired location and thermal demand features 68a, 68b, and 68c. Likewise, the present invention also contemplates other possible configurations of the secondary cooling loop 66. For example, the secondary cooling loop 66 can also be adapted for exclusive use in the freezer compartment 8 or for combinational use between the fresh food and freezer compartments 6, 8. To better illustrate these principles, particular reference is given to
As shown in
Referring now to
From the above-described embodiments, those skilled in the art should appreciate that the secondary cooling loop 66 may be utilized in different heat exchanger configurations depending on the requirements of a particular application. In general, due to the ability to simultaneously cool two or more features, parallel configurations may provide superior cooling versatility and control for some cooling applications. A series configuration is generally simpler, but may not provide the same degree of versatility and control. Thus, to maximize overall circuit efficiency, the location, size, and capacity of the cooling system components may be selected based on the requirements of a particular cooling application.
Accordingly, a refrigerator cooling system has been advantageously described herein. The refrigerator cooling system can selectively provide cooling to a variety of features located throughout the refrigerator resulting in more efficient thermal regulation.
It is to be understood that variations and modifications can be made on the aforementioned structures without departing from the concepts of the present invention, and further it is to be understood that such concepts are intended to be covered by the following claims unless these claims by their language expressly state otherwise.
This application is a continuation of U.S. patent application Ser. No. 13/827,305 (now U.S. Pat. No. 9,562,707), which was filed on Mar. 14, 2013, entitled “REFRIGERATOR COOLING SYSTEM HAVING A SECONDARY COOLING LOOP,” the entire disclosure of which is hereby incorporated by reference.
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Number | Date | Country | |
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Parent | 13827305 | Mar 2013 | US |
Child | 15393877 | US |