Patent Publication Number: US-10317123-B1

Title: Shared evaporator system

Description:
BACKGROUND 
     Refrigerators can be divided into multiple cooling zones that can be controlled independently over the same or different temperature ranges. Each cooling zone is defined by an enclosed space. For example, a refrigerator may include a plurality of refrigerated zones that are designed to operate between 34° Fahrenheit (F) and 42° F. and zero or more freezer zones that are designed to operate below 32° F. 
     SUMMARY 
     In an example embodiment, a refrigerator is provided. The refrigerator includes, but is not limited to, a first evaporator, a refrigerator controller, a first compartment, a second compartment, a first temperature control, a second temperature control, a first fan, a first duct, a first return duct, a second fan, a second duct, and a second return duct. The first compartment includes, but is not limited to, a first plurality of walls, a first compartment access structure, and a first temperature sensor. The first compartment access structure is configured to provide access to a first enclosed space defined by the first plurality of walls and the first compartment access structure. The first temperature sensor is configured to measure a first temperature value of air in the first enclosed space and to send the measured first temperature value to the refrigerator controller. The second compartment includes, but is not limited to, a second plurality of walls, a second compartment access structure, and a second temperature sensor. The second compartment access structure is configured to provide access to a second enclosed space defined by the second plurality of walls and the second compartment access structure. The second temperature sensor is configured to measure a second temperature value of air in the second enclosed space and to send the measured second temperature value to the refrigerator controller. The first temperature control is configured to receive a first temperature setting value for the first compartment and to send the received first temperature setting value to the refrigerator controller. The second temperature control is configured to receive a second temperature setting value for the second compartment and to send the received second temperature setting value to the refrigerator controller. The first fan is mounted adjacent to or in the first enclosed space. The first duct is mounted between the first evaporator and the first enclosed space. The first fan is configured to receive air from the first duct and to move the received air into the first enclosed space when on. The first return duct is mounted at least partially between the first enclosed space and the first evaporator. The second fan is mounted adjacent to or in the second enclosed space. The second duct is mounted between the first evaporator and the second enclosed space. The second fan is configured to receive air from the second duct and to move the received air into the second enclosed space when on. The second return duct is mounted at least partially between the second enclosed space and the first evaporator. The refrigerator controller is configured to receive the sent first temperature value, to receive the sent first temperature setting value, to receive the sent second temperature value, to receive the sent second temperature setting value, to control a flow of refrigerant through a coil of the first evaporator based on the received first temperature value, the received first temperature setting value, the received second temperature value, and the received second temperature value setting, and to separately control operation of the first fan and the second fan. 
     Other principal features of the disclosed subject matter will become apparent to those skilled in the art upon review of the following drawings, the detailed description, and the appended claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Illustrative embodiments of the disclosed subject matter will hereafter be described referring to the accompanying drawings, wherein like numerals denote like elements. 
         FIG. 1  depicts a right, front, perspective view of a refrigerator in accordance with an illustrative embodiment. 
         FIG. 2  depicts a right, back, perspective view of the refrigerator of  FIG. 1  in accordance with an illustrative embodiment. 
         FIG. 3  depicts a right, front, perspective view of the refrigerator of  FIG. 1  with doors removed in accordance with an illustrative embodiment. 
         FIG. 4  depicts a back view of the refrigerator of  FIG. 1  with a back wall portion removed in accordance with an illustrative embodiment. 
         FIG. 5  depicts a front view of the refrigerator of  FIG. 1  with the doors removed in accordance with an illustrative embodiment. 
         FIG. 6  depicts a left-side view of the refrigerator of  FIG. 1  with the doors removed in accordance with an illustrative embodiment. 
         FIG. 7  depicts a left, front perspective view of a first portion of the refrigerator of  FIG. 1  in accordance with an illustrative embodiment. 
         FIG. 8  depicts a right, bottom perspective view of a second portion of the refrigerator of  FIG. 1  in accordance with an illustrative embodiment. 
         FIG. 9  depicts a front view of the second portion of  FIG. 8  in accordance with an illustrative embodiment. 
         FIG. 10  depicts a back view of the second portion of  FIG. 8  in accordance with an illustrative embodiment. 
         FIG. 11  depicts a right-side view of the second portion of  FIG. 8  in accordance with an illustrative embodiment. 
         FIG. 12  depicts a front view of a third compartment back plate of the refrigerator of  FIG. 1  in accordance with an illustrative embodiment. 
         FIG. 13  depicts a right, back perspective view of the third compartment back plate of the refrigerator of  FIG. 1  in accordance with an illustrative embodiment. 
         FIG. 14  depicts a front view of a third portion of the refrigerator of  FIG. 1  in accordance with an illustrative embodiment. 
         FIG. 15  depicts a top, front perspective view of the third portion of  FIG. 14  in accordance with an illustrative embodiment. 
         FIG. 16  depicts a top, front perspective view of a fourth portion of the refrigerator of  FIG. 1  in accordance with an illustrative embodiment. 
         FIG. 17  depicts a top, back perspective view of the fourth portion of  FIG. 16  in accordance with an illustrative embodiment. 
         FIG. 18  depicts a bottom, front perspective view of the fourth portion of  FIG. 16  in accordance with an illustrative embodiment. 
         FIG. 19  depicts a left-side view of the fourth portion of  FIG. 16  in accordance with an illustrative embodiment. 
         FIG. 20  depicts a right-side view of the fourth portion of  FIG. 16  in accordance with an illustrative embodiment. 
         FIG. 21  depicts a top view of the fourth portion of  FIG. 16  in accordance with an illustrative embodiment. 
         FIG. 22  depicts a right, front perspective view of a second compartment duct wall of the refrigerator of  FIG. 1  in accordance with an illustrative embodiment. 
         FIG. 23  depicts a back view of the second compartment duct wall of  FIG. 22  in accordance with an illustrative embodiment. 
         FIG. 24  depicts a right-side view of the second compartment duct wall of  FIG. 22  in accordance with an illustrative embodiment. 
         FIG. 25  depicts a right, front perspective view of the second compartment duct wall of  FIG. 22  covered by plates to direct air flow in accordance with an illustrative embodiment. 
         FIG. 26  depicts a right-side view of the second compartment duct wall of  FIG. 25  in accordance with an illustrative embodiment. 
         FIG. 27  depicts a right, front perspective view of the second compartment duct wall of  FIG. 22  covered by plates and an evaporator in accordance with an illustrative embodiment. 
         FIG. 28  depicts an exploded, right, front perspective view of the second compartment duct wall of  FIG. 27  in accordance with an illustrative embodiment. 
         FIG. 29  depicts an exploded, right-side view of the second compartment duct wall of  FIG. 27  in accordance with an illustrative embodiment. 
         FIG. 30  depicts a right, back perspective view of a second compartment duct plate of the refrigerator of  FIG. 1  in accordance with an illustrative embodiment. 
         FIG. 31  depicts a block diagram of a refrigerator controller of the refrigerator of  FIG. 1  in accordance with an illustrative embodiment. 
         FIG. 32  depicts a flow diagram illustrating examples of operations performed by the refrigerator controller of  FIG. 31  in accordance with an illustrative embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     Referring to  FIG. 1 , a right, front, perspective view of a refrigerator  100  is shown in accordance with an illustrative embodiment. Referring to  FIG. 2 , a right, back, perspective view of refrigerator  100  is shown in accordance with an illustrative embodiment. Refrigerator  100  may include a plurality of compartments or cooling zones. For example, in the illustrative embodiment, refrigerator  100  includes a first compartment  102 , a second compartment  104 , and a third compartment  106 . First compartment  102 , second compartment  104 , and third compartment  106  are stacked vertically with second compartment  104  above first compartment  102  and below third compartment  106 . 
     Each compartment may provide a freezer zone or a refrigerated zone. For example, in the illustrative embodiment, first compartment  102  may be a freezer zone that is designed to operate below 32° F., for example, based on a selection using a first temperature control  3114  (shown referring to  FIG. 31 ). Second compartment  104  and third compartment  106  may be refrigerated zones that are designed to operate between 34° Fahrenheit (F) and 42° F., for example, based on a selection using a second temperature control  3118  (shown referring to  FIG. 31 ) and a third temperature control  3122  (shown referring to  FIG. 31 ), respectively. In general, a temperature of the refrigerated zone is maintained at an adequate temperature for fresh foods and a temperature of the freezer zone is maintained at an adequate temperature for frozen foods. In alternative embodiments, refrigerator  100  may include a fewer or a greater number of compartments arranged vertically and/or horizontally with respect to each other. For example, refrigerator  100  may include compartments to the right of the illustrated compartments. A wall that separates a pair of compartments may or may not be insulated. 
     Each compartment of the plurality of compartments may include a plurality of walls, a compartment access structure configured to provide access to an enclosed space defined by the plurality of walls and the compartment access structure, and a temperature sensor configured to measure a temperature value of air in the enclosed space and to send the measured temperature value to a refrigerator controller  3100  (shown referring to  FIG. 31 ). For example, a first temperature sensor  3112  (shown referring to  FIG. 31 ) may measure a current temperature within first compartment  102 ; a second temperature sensor  3116  (shown referring to  FIG. 31 ) may measure a current temperature within second compartment  104 ; and a third temperature sensor  3120  (shown referring to  FIG. 31 ) may measure a current temperature within third compartment  106 . 
     Refrigerator controller  3100  controls a flow of refrigerant through each refrigeration system of refrigerator  100  where a refrigeration system cools air provided to one or more of the plurality of compartments. Refrigerator  100  may include one or more refrigeration systems. For illustration, a refrigeration system may include a compressor, a condenser, an expansion valve, a dryer, and/or an evaporator through which the refrigerant flows as well as various motors that control operation of the refrigeration system components. An air circulation system that includes a fan, an air duct, and/or a return duct may be associated with each compartment to provide cooled air from the associated evaporator to the enclosed space and to return air from the enclosed space to the associated evaporator to maintain the air in the enclosed space at the temperature selected using the associated temperature control. Two or more compartments of the plurality of compartments may share portions of a refrigeration system and an air circulation system. 
     First compartment  102  may include a first compartment access structure  108  that is a first drawer panel. A first handle  118  is mounted to first compartment access structure  108  to slide a first drawer open for access to a first enclosed space defined by first compartment  102 . First compartment access structure  108  may include one or more gaskets to seal the first enclosed space from external air when first compartment access structure  108  is closed. First compartment  102  may include a plurality of drawers that may be stacked vertically and/or horizontally. 
     Second compartment  104  may include a second compartment access structure  110  that is a second drawer panel. A second handle  120  is mounted to second compartment access structure  110  to slide a second drawer open for access to a second enclosed space defined by second compartment  104 . Second compartment access structure  110  may include one or more gaskets to seal the second enclosed space from external air when second compartment access structure  110  is closed. Second compartment  104  may include a plurality of drawers that may be stacked vertically and/or horizontally. 
     Third compartment  106  may include a third compartment access structure  112  that is a door. A third handle  122  is mounted to third compartment access structure  110  and is used to open the door by rotating it about a first hinge  124  and a second hinge  126  for access to a third enclosed space defined by third compartment  106 . Third compartment access structure  112  may be rotatable in either direction about a horizontal axis or a vertical axis defined by first hinge  124  and second hinge  126 . In alternative embodiments, the door may be mounted to a refrigerator body  300  (shown referring to  FIG. 3 ) of refrigerator  100  using a greater or a fewer number of hinges of various types. Third compartment access structure  112  may include one or more gaskets to seal the third enclosed space from external air when third compartment access structure  112  is closed. 
     Referring to  FIGS. 1 to 3 , refrigerator body  300  may include a top wall  114 , a right-side wall  116 , a left-side wall  302  (shown referring to  FIG. 3 ), a bottom wall  304  (shown referring to  FIG. 3 ), and a back wall  200  (shown referring to  FIG. 2 ). Each wall may be formed of one or more plates. For each wall comprised of a plurality of plates, the plurality of plates is mounted to each other using various fasteners or fastening methods with electrical wiring, ducts, tubing, sensors, and/or insulation possibly mounted between the plurality of plates. For example, back wall  200  includes an exterior plate  202 , a middle plate  301 , a first compartment back plate  410  (shown referring to  FIG. 4 ), a second compartment back plate  408  (shown referring to  FIG. 4 ), and a third compartment back plate  400  (shown referring to  FIG. 4 ). 
     Each compartment of the plurality of compartments may include zero or more shelves, drawers, or other receptacles mounted therein. Zero or more receptacles further may be mounted to each compartment access structure. For example, first compartment  102  and second compartment  104  may include drawer walls that form a receptacle mounted to first compartment access structure  108  and to second compartment access structure  110 , respectively, that slide outward with first compartment access structure  108  and with second compartment access structure  110 , respectively. Third compartment  106  may include shelves mounted to third compartment access structure  112  that open with third compartment access structure  112  as well as shelves and/or drawers mounted within the third enclosed space. The components of refrigerator  100  including refrigerator body  300  may be formed of one or more materials, such as metal, glass, and/or plastic having a sufficient strength and rigidity and aesthetic value to provide the illustrated and/or described function. For example, the one or more shelves, drawers, or other receptacles may be formed of one or more materials, such as metals, glass, and/or plastics having a sufficient strength and rigidity to support food items or other items stored in refrigerator  100  while providing an attractive appearance. 
     In the illustrative embodiment, first compartment access structure  108  provides access to first compartment  102  defined by bottom wall  304 , right-side wall  116 , left-side wall  302 , back wall  200 , and a first divider wall  306 ; second compartment access structure  110  provides access to second compartment  104  defined by first divider wall  306 , right-side wall  116 , left-side wall  302 , back wall  200 , and a second divider wall  308 ; and third compartment access structure  112  provides access to third compartment  106  defined by second divider wall  308 , right-side wall  116 , left-side wall  302 , back wall  200 , and top wall  114 . Bottom wall  304 , right-side wall  116 , left-side wall  302 , back wall  200 , and first divider wall  306  define the first enclosed space of first compartment  102 . First divider wall  306 , right-side wall  116 , left-side wall  302 , back wall  200 , and second divider wall  308  define the second enclosed space of second compartment  104 . Second divider wall  308 , right-side wall  116 , left-side wall  302 , back wall  200 , and top wall  114  define the third enclosed space of third compartment  106 . 
     First compartment  102  further includes a left-side sliding bracket  310  and a right-side sliding bracket (not shown) on which the first drawer is mounted to slide in and out to provide access to the first enclosed space. Second compartment  104  further includes a left-side sliding bracket  312  and a right-side sliding bracket (not shown) on which the second drawer is mounted to slide in and out to provide access to the second enclosed space. Of course, in alternative embodiments, a door may provide access to the first enclosed space and/or the second enclosed space. 
     Though shown in the illustrative embodiment as forming a generally rectangular shaped enclosure with generally rectangular shaped components, refrigerator  100  may form any shaped enclosure including other polygons as well as circular or elliptical enclosures. As a result, each compartment access structure and the walls forming refrigerator body  300  and each compartment may have any shape including other polygons as well as circular or elliptical shapes. The refrigeration system components such as the compressor, the condenser, the evaporator, the dryer, etc. may be mounted to various walls of refrigerator body  300  either within the walls, on an exterior of the walls relative to refrigerator body  300 , and/or on an interior of the walls relative to refrigerator body  300 . 
     Use of directional terms, such as top, bottom, right, left, front, back, etc. are merely intended to facilitate reference to the various surfaces and elements of the described structures relative to the orientations shown in the drawings and are not intended to be limiting in any manner. For consistency, the components of refrigerator  100  are labeled such that the compartment access structure(s) define a front of refrigerator  100 . 
     As used in this disclosure, the term “mount” is intended to define a structural connection between two or more elements and includes join, unite, connect, couple, associate, insert, hang, hold, affix, attach, fasten, bind, paste, secure, bolt, screw, rivet, solder, weld, glue, adhere, form over, layer, and other similar terms. The phrases “mounted on” and “mounted to” include any interior or exterior portion of the elements referenced. These phrases also encompass direct mounting (in which the referenced elements are in direct contact) and indirect mounting (in which the referenced elements are not in direct contact). Elements referenced as mounted to each other herein may further be integrally formed together, for example, using a molding process as understood by a person of skill in the art. As a result, elements described herein as being mounted to each other need not be discrete structural elements. 
     With reference to  FIG. 4 , a back view of refrigerator body  300  is shown with exterior plate  202  and middle plate  301  of back wall  200  removed in accordance with an illustrative embodiment. With reference to  FIG. 5 , a front view of refrigerator body  300  is shown with third compartment back plate  400  of back wall  200  removed in accordance with an illustrative embodiment. With reference to  FIG. 6 , a left-side view of refrigerator body  300  is shown with exterior plate  202  and third compartment back plate  400  of back wall  200  removed in accordance with an illustrative embodiment. 
     In the illustrative embodiment, an air filter mounting plate  402 , an evaporator mounting plate  404 , and a second compartment air duct  406  are mounted to middle plate  301  and/or third compartment back plate  400 . An air filter housing is mounted to air filter mounting plate  402 . An air filter may be mounted within the air filter housing to filter air passing therethrough. 
     Referring to  FIGS. 4 and 5 , the first enclosed space of first compartment  102  is defined by a first compartment left-side plate  500 , a first compartment bottom plate  502 , a first compartment right-side plate  504 , a first compartment top plate  506 , first compartment back plate  410 , and first compartment access structure  108 . In the illustrative embodiment, first compartment  102  is cooled by a first refrigeration system that includes a first evaporator (not shown), a first compressor (not shown), etc. through a first air circulation system (not shown) that includes a first fan  3124  (shown referring to  FIG. 31 ). 
     The second enclosed space of second compartment  104  is defined by a second compartment left-side plate  508 , a second compartment bottom plate  510 , a second compartment right-side plate  512 , a second compartment top plate  514 , second compartment back plate  408 , and second compartment access structure  110 . The third enclosed space of third compartment  106  is defined by a third compartment left-side plate  516 , a third compartment bottom plate  518 , a third compartment right-side plate  520 , a third compartment top plate  522 , third compartment back plate  400 , and third compartment access structure  110 . 
     With reference to  FIG. 7 , a left perspective view of interior components related to circulating cooled air to second compartment  104  are shown in accordance with an illustrative embodiment. With reference to  FIG. 8 , a bottom perspective view of interior components related to circulating cooled air to second compartment  104  and to third compartment  106  are shown in accordance with an illustrative embodiment. With reference to  FIG. 9 , a front view of interior components related to circulating cooled air to second compartment  104  and to third compartment  106  are shown in accordance with an illustrative embodiment. With reference to  FIG. 10 , a back view of interior components related to circulating cooled air to second compartment  104  and to third compartment  106  are shown in accordance with an illustrative embodiment. With reference to  FIG. 11 , a right-side view of interior components related to circulating cooled air to second compartment  104  and to third compartment  106  are shown in accordance with an illustrative embodiment. Second compartment left-side plate  508 , second compartment bottom plate  510 , second compartment right-side plate  512 , second compartment top plate  514 , second compartment back plate  408 , third compartment left-side plate  516 , third compartment bottom plate  518 , third compartment right-side plate  520 , third compartment top plate  522 , and third compartment back plate  400  are either transparent or removed in  FIGS. 7 to 11  to better illustrate the components. 
     In the illustrative embodiment, second compartment  104  and third compartment  106  are cooled by a second refrigeration system that includes a second evaporator  700 , a second compressor (not shown), etc. Second evaporator  700  is mounted to evaporator mounting plate  404  between middle plate  301  and third compartment back plate  400 . In the illustrative embodiment, air flows upward through second evaporator  700  and is cooled by refrigerant that flows through a second evaporator coil  702  of second evaporator  700 . In the illustrative embodiment, evaporator mounting plate  404  is mounted to middle plate  301 . 
     The refrigerant is circulated through second evaporator coil  702  of second evaporator  700 , a second compressor (not shown), a second condenser, an expansion valve, etc. to cool second compartment  104  and third compartment  106 . The second refrigeration system is separate from the first refrigeration system. 
     Second compartment air duct  406  may be mounted between second evaporator  700  and the second enclosed space of second compartment  104 . Second compartment air duct  406  may be mounted to middle plate  301 , third compartment back plate  400 , and/or evaporator mounting plate  404  at a first end and to second compartment back plate  408  at a second end. Air flows from an inlet side of second evaporator  700  that is below second evaporator  700  to an outlet side of second evaporator  700  that is above second evaporator  700  through operation of a third fan  800  (shown referring to  FIG. 8 ). The space between middle plate  301  and third compartment back plate  400  that is above second evaporator  700  defines a third compartment air duct  1100  (shown referring to  FIG. 11 ). The space between middle plate  301  and third compartment back plate  400  that is below second evaporator  700  defines a third compartment return duct  1102  (shown referring to  FIG. 11 ). In the illustrative embodiment, third compartment air duct  1100  and third compartment return duct  1102  form a continuous duct within which second evaporator  700  is mounted. Third fan  800  is mounted within a third fan housing  412  mounted to or within top wall  114  though third fan housing  412  may be mounted to a different wall of refrigerator body  300  and/or within third compartment air duct  1100  in alternative embodiments. 
     A second air circulation system for the second enclosed space may include second compartment air duct  406 , a second fan  704 , a second compartment return duct wall  708 , a second compartment return duct wall  314 , an air flow diverter wall  710 , and third compartment return duct  1102 . Second compartment return duct wall  708  and second compartment return duct wall  314  define a second compartment return duct  709 . Second compartment return duct wall  708  forms a first aperture and a second aperture. Second compartment return duct wall  314  forms a third aperture and a fourth aperture. The first aperture of second compartment return duct wall  708  is located in the second enclosed space as shown referring to  FIG. 8 . The fourth aperture of second compartment return duct wall  314  is located in third compartment return duct  1102  between middle plate  301  and third compartment back plate  400  below second evaporator  700 . The second aperture of second compartment return duct wall  708  is mounted to the third aperture of second compartment return duct wall  314  to form second compartment return duct  709 . Of course, second compartment return duct  709  may be formed of a fewer or a greater number of duct walls having various shapes and sizes sufficient to circulate a desired amount of air from the second enclosed space towards second evaporator  700  from the second enclosed space. 
     Air flow diverter wall  710  is mounted between middle plate  301  and third compartment back plate  400  and above the fourth aperture of second compartment return duct wall  314  to receive and redirect air from second compartment return duct  709  towards the inlet side of second evaporator  700 . In the illustrative embodiment, air flow diverter wall  710  extends between a left-side of second evaporator  700  and a left-side plate  711  of third compartment back plate  400  to block and redirect all of the air from second compartment return duct  709 . 
     In the illustrative embodiment, second compartment return duct  709  is positioned adjacent second compartment back plate  408 . Second fan  704  is mounted within a second fan housing  706  mounted to or within second compartment air duct  406  and/or second compartment back plate  408 . The first aperture of second compartment return duct wall  708  is located at an opposite end of second compartment back plate  408  relative to second fan  704 . Second fan  704  may be selected based on a direction of desired air flow into the second enclosed space and a size of the second enclosed space. For example, second fan  704  may be an axial flow fan such as that shown in the illustrative embodiment, a centrifugal fan, a cross-flow fan, etc. A motor (not shown) for second fan  704  may also be mounted within second fan housing  706 . Second fan  704  may be mounted to a different wall of refrigerator body  300  in alternative embodiments. 
     Second temperature sensor  3116  may be mounted in the second enclosed space to measure a first temperature of the air in the second enclosed space and to send the measured first temperature to refrigerator controller  3100 . For illustration, second temperature sensor  3116  may be a thermistor electrically connected either by wire or wirelessly to refrigerator controller  3100 . In an illustrative embodiment, second temperature sensor  3116  may be mounted within or adjacent the second enclosed space generally opposite second fan  704 . 
     A third air circulation system for the third enclosed space may include third compartment air duct  1100 , third fan  800 , third compartment return duct  1102 , and a plurality of vent aperture walls  712  that define a plurality of vents formed through third compartment back plate  400 . The plurality of vents is positioned between the third enclosed space and third compartment return duct  1102 . The plurality of vents is located at an opposite end of third compartment back plate  400  relative to third fan  800 . Third fan  800  may be selected based on a direction of desired air flow into the third enclosed space and a size of the third enclosed space. For example, third fan  800  may be an axial flow fan such as that shown in the illustrative embodiment, a centrifugal fan, a cross-flow fan, etc. A motor (not shown) for third fan  800  may also be mounted within third fan housing  412 . 
     An evaporator condensation tray  316  is mounted below second evaporator  700  to catch any liquid and route it to an exterior of refrigerator body  300  through an drain port  204 . 
     Third temperature sensor  3120  may be mounted in the third enclosed space to measure a second temperature of the air in the third enclosed space and to send the measured second temperature to refrigerator controller  3100 . For illustration, third temperature sensor  3120  may be a thermistor electrically connected either by wire or wirelessly to refrigerator controller  3100 . In an illustrative embodiment, third temperature sensor  3120  may be mounted within or adjacent the third enclosed space in a location chosen for optimal control of the temperature. 
     The position and orientation of various components of the second refrigeration system, the second air circulation system, and the third air circulation system may be moved and/or reoriented based on the arrangement of second compartment  104  and third compartment  106  relative to each other. Additionally, various components of the second refrigeration system, the second air circulation system, and the third air circulation system may be mounted in a different wall of refrigerator  300  or mounted in different walls instead of mounted in the same wall. For example, second evaporator  700  may be positioned adjacent second compartment  104  instead of third compartment  106  or between second compartment  104  and third compartment  106 . Second evaporator  700  further may be mounted in left-side wall  302  or right-side wall  116  instead of back wall  200 . 
     Referring to  FIG. 12 , a front view of third compartment back plate  400  is shown in accordance with an illustrative embodiment. Referring to  FIG. 13 , a right-side, back perspective view of third compartment back plate  400  is shown in accordance with an illustrative embodiment. In the illustrative embodiment, the plurality of vent aperture walls  712  are arranged in two rows adjacent a bottom of third compartment back plate  400 . In alternative embodiments, the plurality of vent aperture walls  712  may have other shapes and sizes and may be arranged in a fewer or a greater number of rows and columns. A left tab  1200 , a right tab  1202 , a left hook  1300 , and a right hook  1302  are used to mount third compartment back plate  400  to middle plate  301  though other mounting methods and fasteners may be used in alternative embodiments. Left tab  1200  and right tab  1202  extend upward from a top edge  1204  of third compartment back plate  400 . Left hook  1300  is formed at a bottom end of left-side plate  711 . Right hook  1302  is formed at a bottom end of a right-side plate  1206 . The plurality of vent aperture walls  712  do not extend into an area  1204  located in front of second compartment return duct wall  314 . 
     Referring to  FIG. 14 , a front view of components of the second air circulation system and the third air circulation system are shown in accordance with an illustrative embodiment. Referring to  FIG. 15 , a top, front perspective view of components of the second air circulation system and the third air circulation system are shown in accordance with an illustrative embodiment. Referring to  FIG. 16 , a top, front perspective view of components of the second air circulation system are shown in accordance with an illustrative embodiment. Referring to  FIG. 17 , a right-side, back perspective view of components of the second air circulation system are shown in accordance with an illustrative embodiment. Referring to  FIG. 18 , a bottom, front perspective view of components of the second air circulation system are shown in accordance with an illustrative embodiment. Referring to  FIG. 19 , a left-side view of components of the second air circulation system are shown in accordance with an illustrative embodiment. Referring to  FIG. 20 , a right-side view of components of the second air circulation system are shown in accordance with an illustrative embodiment. Referring to  FIG. 21 , a top view of components of the second air circulation system are shown in accordance with an illustrative embodiment. 
     Drain port  204  and second compartment air duct  406  protrude outward toward back plate  202 . 
     Referring to  FIG. 22 , a front perspective view of evaporator mounting plate  404  and second compartment air duct  406  are shown in accordance with an illustrative embodiment. Referring to  FIG. 23 , a back view of evaporator mounting plate  404  and second compartment air duct  406  are shown in accordance with an illustrative embodiment. Referring to  FIG. 24 , a right-side view of evaporator mounting plate  404  and second compartment air duct  406  are shown in accordance with an illustrative embodiment. 
     For illustration, second compartment air duct  406  and evaporator mounting plate  404  may be a single continuous piece of material, for example, by molding, or may be formed of multiple distinct pieces mounted together, for example, attached to each other using various fasteners including adhesives, screws, rivets, welding, etc. Evaporator mounting plate  404  may be mounted to middle plate  301  using double sided tape and a first locator  904  and a second locator  906 . Second compartment air duct  406  may be mounted to second compartment back plate  408  using a third locator  908 . First locator  904 , second locator  906 , and third locator  908  facilitate a proper positioning of evaporator mounting plate  404  and of second compartment air duct  406  relative to middle plate  301  and to second compartment back plate  408 , respectively. 
     Evaporator mounting plate  404  may include a flat plate  2200 , a raised edge  2202 , a ledge  2204 , a first fastener aperture wall  2206 , and a second fastener aperture wall  2208 . First fastener aperture wall  2206  and second fastener aperture wall  2208  are formed through flat plate  2200 . 
     Second compartment air duct  406  may include an entry portion  2210 , a funnel portion  2212 , a channel portion  2214 , a bowl portion  2216 , a right-side wing plate  2218 , and a left-side wing plate  2220 . Entry portion  2210  is defined by walls that form a rectangular aperture with a curved back wall. Funnel portion  2212  is below entry portion  2210  and is defined by walls that form a rectangular channel with a sloped wall on one side that decreases a channel width from a width of entry portion  2210  to a width of channel portion  2214 . Channel portion  2214  is below funnel portion  2212  and is defined by walls that form a rectangular channel between funnel portion  2212  and bowl portion  2216 . Bowl portion  2216  is below channel portion  2214  and is defined by walls that transition from the channel formed by channel portion  2214  to sloped and curved walls that form a generally concave bowl. The concave bowl may be sized and shaped (curved) based on second fan  704  to assist in directing air from second evaporator  700  toward second fan  704 . Right-side wing plate  2218  and left-side wing plate  2220  extends in a generally perpendicular direction from opposite walls of channel portion  2214  between funnel portion  2212  and bowl portion  2216 . 
     Raised edge  2202  extends in a generally perpendicular direction from a periphery of flat plate  2200  except where entry portion  2210  and funnel portion  2212  form apertures in flat plate  2200 . Ledge  2204  extends outward in a generally perpendicular direction from a periphery of raised edge  2202 . 
     Referring to  FIG. 25 , a front perspective view of evaporator mounting plate  404  and second compartment air duct  406  are shown in accordance with an illustrative embodiment. Referring to  FIG. 26 , a right-side view of evaporator mounting plate  404  and second compartment air duct  406  are shown in accordance with an illustrative embodiment. 
     A first duct plate  2500  and a second duct plate  1600  (reference first shown referring to  FIG. 16 ) are mounted to cover portions of second compartment air duct  406  to control air flow from second evaporator  700  to second fan  704 . Referring to  FIG. 30 , right, back perspective view of first duct plate  2500  that is transparent is shown in accordance with an illustrative embodiment. 
     First duct plate  2500  may include a first duct plate wall  2504 , a plate aperture wall  2506 , an aperture drip plate  2508 , a duct plate mounting tab  2510 , a third fastener aperture wall  2516 , and a fourth fastener aperture wall  2518 . Third fastener aperture wall  2516  and fourth fastener aperture wall  2518  are formed through first duct plate wall  2504 . In  FIG. 26 , second compartment air duct  406  is transparent to show a relative location of aperture drip plate  2508  when first duct plate  2500  is mounted to second compartment air duct  406 . First duct plate wall  2504  is sized and shaped to fit within raised edge  2202  of evaporator mounting plate  404 . Duct plate mounting tab  2510  is sized and shaped to abut raised edge  2202  and ledge  2204  along a bottom edge of evaporator mounting plate  404 . Duct plate mounting tab  2510  provides a drip edge to keep water droplets from pooling in a bottom edge of third compartment back plate  400  and evaporator mounting plate  404  and entering a cabinet foam mounted between third compartment back plate  400  and exterior plate  202 . Plate aperture wall  2506  defines a rectangular aperture that aligns with the aperture formed by entry portion  2210  when first duct plate  2500  is mounted to evaporator mounting plate  404 . Aperture drip plate  2508  is sloped upward from a bottom edge of plate aperture wall  2506  as discussed further below. 
     Second duct plate  1600  may include a second duct plate wall  2512 , a plate ledge  2514 , and a second duct plate mounting tab  2800  (shown referring to  FIG. 28 ). Plate ledge  2514  extends outward in a generally perpendicular direction from a bottom edge of second duct plate wall  2512  to cover a transition area between fan housing  706  and second compartment air duct  406 . Second duct plate mounting tab  2800  is sized and shaped to cover a transition region between funnel portion  2212  and channel portion  2214  approximately where raised edge  2202  and ledge  2204  do not extend around a periphery of flat plate  2200 . 
     Plate aperture wall  2506  provides an opening in first duct plate wall  2504  for air from second evaporator  700  to be received into second compartment air duct  406  when second fan  704  is on, but otherwise blocks a flow of air from second evaporator  700  to second compartment air duct  406 . Second duct plate wall  2512  and second duct plate mounting tab  2800  fit over channel portion  2214  to form an enclosure that keeps air from escaping second compartment air duct  406  before it reaches second fan  704 . 
     Referring to  FIG. 27 , a front perspective view of second evaporator  700  and evaporator mounting plate  404  and second compartment air duct  406  covered by first duct plate  2500  and second duct plate  1600  are shown in accordance with an illustrative embodiment. Referring to  FIG. 28 , an exploded, front perspective view of second evaporator  700  and evaporator mounting plate  404  and second compartment air duct  406  covered by first duct plate  2500  and second duct plate  1600  are shown in accordance with an illustrative embodiment. Referring to  FIG. 29 , an exploded, right-side view of second evaporator  700  and evaporator mounting plate  404  and second compartment air duct  406  covered by first duct plate  2500  and second duct plate  1600  are shown in accordance with an illustrative embodiment. 
     A center line  2900  indicates a vertical center through plate aperture wall  2506  and through second evaporator  700  such that the vertical center of plate aperture wall  2506  is aligned with the vertical center of second evaporator  700 . As a result, air drawn through plate aperture wall  2506  is approximately from a vertical center of second evaporator  700  though this is not required. The vertical center can, for example, be positioned between an upper line  2902  and a lower line  2904 . Upper line  2902  extends through a vertical upper limit that defines a first distance  2906  that is approximately 40% above a total length  2908  of second evaporator  700 . Lower line  2904  extends through a vertical lower limit that defines a second distance  2910  that is approximately 40% below total length  2908  of second evaporator  700 . For example, the vertical center location as well as a shape and a size of plate aperture wall  2506  can be selected based on a relative volume of the second enclosed space relative to the third enclosed space and/or based on an aperture total length  3000  of the aperture formed by plate aperture wall  2506 . Though not required, it may be preferable that the aperture formed by plate aperture wall  2506  not extend outside (above/below/right/left) an extent of second evaporator  700  to avoid pulling cooled air from third compartment air duct  1100  when second fan  704  is on, but third fan  800  is off or to pull uncooled air from third compartment return duct  1102  when second fan  704  is on. 
     First duct plate wall  2504  blocks a remainder of air from flowing into second compartment air duct  406  so that the remainder of air flows upward into third compartment air duct  1100  when third fan  800  is on. When neither second fan  704  or third fan  800  is on, the air within the second enclosed space and the third enclosed space is generally stagnate and moves based on opening or closing of the access structure to either space and on the laws of thermodynamics such that warmer air tends to move upwards. 
     Plate aperture wall  2506  is also adjacent a right-side of second evaporator  700  because second fan  704  is positioned near second compartment right-side plate  512 . Funnel portion  2212  transitions from a right-side of plate aperture wall  2506  to a right-side of channel portion  2214  that is approximately a width of bowl portion  2216  that is sized and shaped to provide adequate air flow from plate aperture wall  2506  to second fan  704 . Of course, the described components can be arranged in other orientations based on their relative location. For example, the described vertical direction may be a horizontal direction in an alternative embodiment, and/or may be positioned on or near a left-side or a center of second evaporator  700 . 
     A first evaporator mounting tab  901  (shown referring to  FIG. 9 ) and a second evaporator mounting tab  903  (reference first shown referring to  FIG. 9 ) are mounted to second evaporator  700  to extend outward in a generally perpendicular direction from a side wall of second evaporator  700 . A fifth fastener aperture wall  900  (shown referring to  FIG. 9 ) is formed through first evaporator mounting tab  901 , and a sixth fastener aperture wall  902  (reference first shown referring to  FIG. 9 ) is formed through second evaporator mounting tab  903 . Second evaporator  700  may be mounted to first duct plate  2500  and to evaporator mounting plate  404  by inserting a first fastener (not shown) within first fastener aperture wall  2206 , third fastener aperture wall  2516 , and fifth fastener aperture wall  900  and by inserting a second fastener (not shown) within second fastener aperture wall  2208 , fourth fastener aperture wall  2518 , and sixth fastener aperture wall  902 . For example, the first fastener and the second fastener may be a screw or rivet. Second evaporator  700  may be mounted to first duct plate  2500  and to evaporator mounting plate  404  using other types of fasteners and/or fastening methods. 
     Referring to  FIG. 31 , a block diagram of refrigerator controller  3100  is shown in accordance with an illustrative embodiment. Refrigerator controller  3100  may include an input interface  3102 , an output interface  3104 , a communication interface  3106 , a non-transitory computer-readable medium  3108 , a processor  3110 , a control application  3128 , and control data  3130 . Fewer, different, and/or additional components may be incorporated into refrigerator controller  3100 . 
     Input interface  3102  provides an interface for receiving information from a user or another device for entry into refrigerator controller  3100  as understood by those skilled in the art. Input interface  3102  may interface with various input technologies including, but not limited to, first temperature sensor  3112 , first temperature control  3114 , second temperature sensor  3116 , second temperature control  3118 , third temperature sensor  3120 , third temperature control  3122 , etc. For example, each temperature sensor may produce a sensor signal value referred to as a measured temperature value representative of a measure of the temperature in an environment to which the temperature sensor is associated. Refrigerator  100  may include various numbers of and types of sensors that measure quantities associated with operating environment of refrigerator  100  and its various compartments. Example sensor types include a pressure sensor, a temperature sensor, a fluid flow rate sensor, a voltage sensor, a current sensor, a frequency sensor, a humidity sensor, an acoustic sensor, a light sensor, a motion sensor, that may be mounted to various components of refrigerator  100 . 
     The same interface may support both input interface  3102  and output interface  3104 . The input interface technology further may be accessible by refrigerator controller  3100  through communication interface  3106 . 
     Output interface  3104  provides an interface for outputting information for review by a user of refrigerator controller  3100  and/or for use by another application or device. For example, output interface  3104  may interface with various output technologies including, but not limited to, third fan  800 , second fan  704 , third fan  3126 , refrigerant control  3126 , etc. Refrigerator controller  3100  may have one or more output interfaces that use the same or a different output interface technology. The output interface technology further may be accessible by refrigerator controller  3100  through communication interface  3106 . 
     Communication interface  3106  provides an interface for receiving and transmitting data between devices using various protocols, transmission technologies, and media as understood by those skilled in the art. Communication interface  3106  may support communication using various transmission media that may be wired and/or wireless. Refrigerator controller  3100  may have one or more communication interfaces that use the same or a different communication interface technology. For example, refrigerator controller  3100  may support communication using an Ethernet port, a Bluetooth antenna, a telephone jack, a USB port, etc. Data and messages may be transferred between refrigerator controller  3100  and another device using communication interface  3106 . For illustration, a smart phone may send a temperature control setting value to refrigerator controller  3100 . 
     Computer-readable medium  3108  is an electronic holding place or storage for information so the information can be accessed by processor  3110  as understood by those skilled in the art. Computer-readable medium  3108  can include, but is not limited to, any type of random access memory (RAM), any type of read only memory (ROM), any type of flash memory, etc. such as magnetic storage devices (e.g., hard disk, floppy disk, magnetic strips, . . . ), optical disks (e.g., compact disc (CD), digital versatile disc (DVD), . . . ), smart cards, flash memory devices, etc. Refrigerator controller  3100  may have one or more computer-readable media that use the same or a different memory media technology. For example, computer-readable medium  3108  may include different types of computer-readable media that may be organized hierarchically to provide efficient access to the data stored therein as understood by a person of skill in the art. As an example, a cache may be implemented in a smaller, faster memory that stores copies of data from the most frequently/recently accessed main memory locations to reduce an access latency. Refrigerator controller  3100  also may have one or more drives that support the loading of a memory media such as a CD, DVD, an external hard drive, etc. One or more external hard drives further may be connected to refrigerator controller  3100  using communication interface  3106 . 
     Processor  3110  executes instructions as understood by those skilled in the art. The instructions may be carried out by a special purpose computer, logic circuits, or hardware circuits. Processor  3110  may be implemented in hardware and/or firmware. Processor  3110  executes an instruction, meaning it performs/controls the operations called for by that instruction. The term “execution” is the process of running an application or the carrying out of the operation called for by an instruction. The instructions may be written using one or more programming language, scripting language, assembly language, etc. Processor  3110  operably couples with input interface  3102 , with output interface  3104 , with communication interface  3106 , and with computer-readable medium  3108  to receive, to send, and to process information. Processor  3110  may retrieve a set of instructions from a permanent memory device and copy the instructions in an executable form to a temporary memory device that is generally some form of RAM. Refrigerator controller  3100  may include a plurality of processors that use the same or a different processing technology. 
     Control application  3128  performs operations associated with controlling the operation of refrigerator  100  to cool the various compartments to the selected temperature. The operations may be implemented using hardware, firmware, software, or any combination of these methods. Referring to the example embodiment of  FIG. 31 , control application  3128  is implemented in software (comprised of computer-readable and/or computer-executable instructions) stored in computer-readable medium  3108  and accessible by processor  3110  for execution of the instructions that embody the operations of control application  3128 . Control application  3128  may be written using one or more programming languages, assembly languages, scripting languages, etc. 
     Referring to  FIG. 32 , example operations associated with control application  3128  are described. Additional, fewer, or different operations may be performed depending on the embodiment of control application  3128 . The order of presentation of the operations of  FIG. 32  is not intended to be limiting. Although some of the operational flows are presented in sequence, the various operations may be performed in various repetitions, concurrently (in parallel, for example, using threads), and/or in other orders than those that are illustrated. Control application  3128  may perform other operations, for example, associated with making ice, dispensing ice, turning on or off one or more lights, turning on or off a dryer based on a humidity level, detecting a door open or close, etc. 
     In an operation  3200 , a first temperature setting value may be received that indicates a desired temperature setting for first compartment  102 . For example, the first temperature setting value may be received from first temperature control  3114  through input interface  3102  or communication interface  3106 . The first temperature setting value may be stored in control data  3130 . 
     In an operation  3202 , a second temperature setting value may be received that indicates a desired temperature setting for second compartment  104 . For example, the second temperature setting value may be received from second temperature control  3118  through input interface  3102  or communication interface  3106 . The third temperature setting value may be stored in control data  3130 . 
     In an operation  3204 , a third temperature setting value may be received that indicates a desired temperature setting for third compartment  106 . For example, the third temperature setting value may be received from third temperature control  3122  through input interface  3102  or communication interface  3106 . The third temperature setting value may be stored in control data  3130 . 
     In an operation  3206 , a first temperature value may be received that indicates a current temperature in first compartment  102 . For example, the first temperature value may be received from first temperature sensor  3112  through input interface  3102  or communication interface  3106 . 
     In an operation  3208 , a second temperature value may be received that indicates a current temperature in second compartment  104 . For example, the second temperature value may be received from second temperature sensor  3116  through input interface  3102  or communication interface  3106 . 
     In an operation  3210 , a third temperature value may be received that indicates a current temperature in third compartment  106 . For example, the third temperature value may be received from third temperature sensor  3120  through input interface  3102  or communication interface  3106 . 
     In an operation  3212 , the first temperature value is compared to the first temperature setting value to determine if cooling is needed in first compartment  102 . 
     In an operation  3214 , the second temperature value is compared to the second temperature setting value to determine if cooling is needed in second compartment  104 . 
     In an operation  3216 , the third temperature value is compared to the third temperature setting value to determine if cooling is needed in third compartment  106 . 
     In an operation  3218 , a determination is made concerning whether or not cooling is needed in first compartment  102  based on the comparison in operation  3212 . When cooling is needed in first compartment  102 , processing continues in an operation  3220 . When cooling is not needed in first compartment  102 , processing continues in an operation  3224 . 
     In operation  3220 , first fan  3124  is turned on to circulate air through the first air circulation system. 
     In an operation  3222 , a flow of refrigerant through the first evaporator is controlled to cool the air circulated through the first air circulation system. 
     In operation  3224 , a determination is made concerning whether or not cooling is needed in second compartment  104  based on the comparison in operation  3214 . When cooling is needed in second compartment  104 , processing continues in an operation  3226 . When cooling is not needed in second compartment  104 , processing continues in an operation  3230 . 
     In operation  3226 , second fan  704  is turned on to circulate air through the second air circulation system. Second fan  704  draws air from second evaporator  700  through plate aperture wall  2506  and into second compartment air duct  406  where it flows downwards through second fan  704  and into second compartment  104 . Return air is drawn upward through second compartment return duct  709 , into third compartment return duct  1102 , and into the inlet side of and over second evaporator  700  to repeat the air circulation cycle. 
     In the illustrative embodiment, second fan  704  draws air from approximately a right center portion of second evaporator  700  through plate aperture wall  2506 . Aperture drip plate  2508  is sloped upward from the bottom edge of plate aperture wall  2506  to allow condensation from second evaporator  700  to drain into evaporator condensation tray  316  and not into second compartment air duct  406 . 
     In an operation  3228 , a flow of refrigerant through second evaporator  700  is controlled to cool the air circulated through the second air circulation system. For example, the second compressor and the second condenser are connected to receive refrigerant from second evaporator  700  through operation of various valves and/or motors also under control of control application  3128 . A first compressor speed for operating the second compressor may be determined based on the comparison between the second temperature value and the second temperature setting value in operation  3214 . 
     In operation  3230 , a determination is made concerning whether or not cooling is needed in third compartment  106 . based on the comparison in operation  3216 . When cooling is needed in third compartment  106 , processing continues in an operation  3232 . When cooling is not needed in third compartment  106 , processing continues in an operation  3206 . 
     In operation  3232 , third fan  800  is turned on to circulate air through the third air circulation system. Third fan  800  draws air from second evaporator  700  upwards through third compartment air duct  1100  and into third compartment  106  where the cooled air moves downward toward the plurality of vent aperture walls  712  that define the plurality of vents formed through third compartment back plate  400 . The air is drawn through the plurality of vents and into third compartment return duct  1102  based on operation of third fan  800 . The air is again drawn over second evaporator  700  upwards through third compartment air duct  1100  to repeat the air circulation cycle. 
     In an operation  3234 , a flow of refrigerant through second evaporator  700  is controlled to cool the air circulated through the third air circulation system. A second compressor speed for operating the second compressor may be determined based on the comparison between the third temperature value and the third temperature setting value in operation  3216 . When both second compartment  104  and third compartment  106  need cooling, a highest compressor speed may be selected from the determined first compressor speed and the determined second compressor speed. In an alternative embodiment, the second compressor may not be operated by a variable speed motor and a single compressor speed is used regardless of whether either or both of second compartment  104  and third compartment  106  need cooling. The compressor speed(s) may be defined in control data  3130  optionally as a function of a temperature difference between a measured temperature value and a temperature setting value. 
     Processing may continue in operation  3206  though a new temperature setting value may be received at any time, which may trigger a repeat of any of operations  3200 ,  3202 , or  3204 . 
     Either or both of third fan  800  and second fan  704  may be operated to defrost second evaporator  700 . Any resulting condensation is received by evaporator condensation tray  316  mounted below second evaporator  700  and routed to an exterior of refrigerator body  300  through drain port  204 . 
     When third fan  800  is on and second fan  704  is off, some air may be drawn upward through second compartment return duct  709  and into third compartment return duct  1102  from second compartment  104 . Similarly, when third fan  800  is off and second fan  704  is on, some air may be drawn through the plurality of vents formed through third compartment back plate  400  and into third compartment return duct  1102  from third compartment  106 . Thus, the second air circulation system and the third air circulation system share third compartment return duct  1102  and second evaporator  700  and influence each other to some extent. 
     An air treatment system (not shown) may be mounted in various locations of refrigerator  100  to filter air passing the third air circulation system and the second air circulation system because the air systems are linked through third compartment return duct  1102 . For example, as shown in  FIGS. 4 to 6 , an air filter housed in an air filter housing mounted to air filter mounting plate  402  may be mounted between middle plate  301  and third compartment back plate  400  and at least partially within third compartment air duct  1100 . The air treatment system may be configured to treat (e.g., purify, filter scrub, freshen, etc.) air inside second compartment  104  and third compartment  106 . 
     The air treatment system, the second compressor, and second evaporator  700  are shared between second compartment  104  and third compartment  106  eliminating an evaporator and/or compressor to cool second compartment  104  though allowing independent control of cooling to second compartment  104 . 
     The word “illustrative” is used herein to mean serving as an example, instance, or illustration. Any aspect or design described herein as “illustrative” is not necessarily to be construed as preferred or advantageous over other aspects or designs. Further, for the purposes of this disclosure and unless otherwise specified, “a” or “an” means “one or more”. Still further, using “and” or “or” in the detailed description is intended to include “and/or” unless specifically indicated otherwise. The illustrative embodiments may be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques to produce software, firmware, hardware, or any combination thereof to control a computer to implement the disclosed embodiments. 
     The foregoing description of illustrative embodiments of the disclosed subject matter has been presented for purposes of illustration and of description. It is not intended to be exhaustive or to limit the disclosed subject matter to the precise form disclosed, and modifications and variations are possible in light of the above teachings or may be acquired from practice of the disclosed subject matter. The embodiments were chosen and described in order to explain the principles of the disclosed subject matter and as practical applications of the disclosed subject matter to enable one skilled in the art to utilize the disclosed subject matter in various embodiments and with various modifications as suited to the particular use contemplated.