PALLET PLATFORM WITH COOL AIR TOWER

Abstract

A cooling system for perishable items.

Description

2. BACKGROUND

This disclosure relates to refrigeration systems for perishable items.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic illustration of an exemplary embodiment of an apparatus for cooling perishable items.

FIG. 2 is a schematic illustration of an exemplary embodiment of a system for cooling perishable items that includes one or more of the apparatus of FIG. 1.

FIG. 3 is a top plan view of the apparatus of FIG. 1.

FIG. 4 is a side elevation view of the apparatus of FIG. 3.

FIG. 5 is an opposite side elevation view of the apparatus of FIG. 3.

FIG. 6 is a fragmentary cross sectional view of the apparatus of FIG. 3.

FIG. 7 is another fragmentary cross sectional view of the apparatus of FIG. 3.

FIG. 8 is an end side elevation view of the apparatus of FIG. 3.

FIG. 9 is another fragmentary cross sectional view of the apparatus of FIG. 3.

FIG. 10 is a fragmentary cross sectional view of the apparatus of FIG. 8.

FIG. 11 is another fragmentary cross sectional view of the apparatus of FIG. 8.

FIG. 12 is another fragmentary cross sectional view of the apparatus of FIG. 8.

FIG. 13 is another fragmentary cross sectional view of the apparatus of FIG. 3.

FIG. 14 is a fragmentary cross sectional view of the apparatus of FIG. 3 illustrating the movement of the apparatus.

FIG. 15 is a fragmentary cross sectional view of the apparatus of FIG. 3 illustrating the operation of the apparatus.

FIG. 16 is a schematic illustration of an exemplary embodiment of a system for cooling perishable items.

FIG. 17 is a schematic illustration of an exemplary embodiment of a system for cooling perishable items.

FIG. 18 is a schematic illustration of an exemplary embodiment of a system for cooling perishable items.

FIG. 19 is a schematic illustration of an exemplary embodiment of a system for cooling perishable items.

DETAILED DESCRIPTION

In the drawings and description that follows, like parts are marked throughout the specification and drawings with the same reference numerals, respectively. The drawings are not necessarily to scale. Certain features of the invention may be shown exaggerated in scale or in somewhat schematic form and some details of conventional elements may not be shown in the interest of clarity and conciseness. The present invention is susceptible to embodiments of different forms. Specific embodiments are described in detail and are shown in the drawings, with the understanding that the present disclosure is to be considered an exemplification of the principles of the invention, and is not intended to limit the invention to that illustrated and described herein. It is to be fully recognized that the different teachings of the embodiments discussed below may be employed separately or in any suitable combination to produce desired results. The various characteristics mentioned above, as well as other features and characteristics described in more detail below, will be readily apparent to those skilled in the art upon reading the following detailed description of the embodiments, and by referring to the accompanying drawings.

Referring initially to FIGS. 1-14, an exemplary embodiment of an apparatus 100 for cooling perishable items includes a housing 102 having a first horizontal section 104, a second horizontal section 106, and a vertical section 108 positioned between the first and second horizontal sections. The horizontal sections, 104 and 106, and the intermediate vertical section 108 are supported from below by spaced apart support members, 110, 112, and 114, that span the length of the apparatus 100. In this manner, hollow portions, 116 and 118, are defined between the support members, 110 and 112, and 112 and 114, respectively. The horizontal sections, 104 and 106, and the intermediate vertical section 108 are also supported from below by end plates, 120 and 122, positioned at opposite ends of the apparatus 100, that are connected to opposite ends of the support members, 110, 112, and 114.

The first horizontal section 104 includes an air passageway 124 at one end that is fluidicly coupled with ends of the hollow portions, 116 and 118, and the second horizontal section 106 includes an air passageway 126 at one end that is fluidicly coupled with the other ends of the hollow portions, 116 and 118. In an exemplary embodiment, both of the passageways, 124 and 126, include slotted air intakes.

The end plates 120 and 122 include air passageways, 128 and 130, respectively, that are each fluidicly coupled with opposite ends of the hollow portions, 116 and 118. In an exemplary embodiment, both of the air passageways, 128 and 130, include slotted air intakes.

The vertical section 108 includes opposing vertical side walls, 132 and 134 and 136 and 138, and a top end wall 140. The vertical side walls, 132, 134, 136 and 138 and the top end wall 140 together define an internal vertical air passage 142 that is fluidically coupled to the hollow portions, 116 and 118, are defined between the support members, 110 and 112, and 112 and 114, respectively.

The vertical wall 132, which also faces the horizontal section 104, defines a passageway 144 that is fluidicly coupled to the vertical passage 142. The vertical wall 134, which also faces the horizontal section 106, defines a passageway 146 that is fluidicly coupled to the vertical passage 142. In an exemplary embodiment, the passageways, 144 and 146, include slotted air discharge diffusers.

In an exemplary embodiment, one or more fans 200 are positioned and supported within the vertical passage 142 of the housing 102 for displacing air upwardly within the vertical passage. In an exemplary embodiment, the fans 200 are operably coupled to a controller 202 for controlling the operation of the fans.

In an exemplary embodiment, one or more evaporator cooling coils 204 are positioned and supported within the vertical passage 142 of the housing 102 at a location proximate and below the fans 200. In an exemplary embodiment, the evaporator coils 204 include and inlet 204a and an outlet 204b that permit a chilled fluidic material such as, for example, chilled water and glycol, or any refrigerant, to be transmitted through the coils. In this manner, the operation of the evaporator coil 204 provides a refrigeration system for the apparatus 100. In this manner, as air is displaced upwardly within vertical passage 142 of the housing 102, the air is cooled as it passes over and through the evaporator coils 204.

In an exemplary embodiment, one or more ultraviolet (“UV”) lights 206 are positioned and supported within the vertical passage 142 of the housing 102 at a location proximate and below the fans 200. In an exemplary embodiment, the UV lights 206 are operably coupled the controller 202 for controlling and monitoring the operation of the UV lights. In this manner, as air is displaced upwardly within vertical passage 142 of the housing 102, mold, bacteria, and other organisms are exposed to the UV light generated by the UV lights 206 thereby killing organisms present in the air.

In an exemplary embodiment, a condensate pump 208 and condensate drain pan 210 are positioned and supported within the housing 102 at a location proximate and below the evaporator coils 204. In particular, in an exemplary embodiment, the condensate drain pan 210 is positioned below the evaporator coils 204 in order to catch condensation generated during the operation of the evaporator coils. In an exemplary embodiment, an inlet of the condensate pump 208 is fluidicly coupled to the interior of the condensate drain pan 210 in order to permit the condensate pump to pump condensation captured by the condensate drain pan out of the pan in into an overhead drain system 212 provided in the building that houses the apparatus 100.

In an exemplary embodiment a power supply 214 is positioned and supported within the housing 102 for supplying power to the fans 200, the controller 202, the UV lights 206 and the condensate pump 208.

In an exemplary embodiment, the inlet and outlets, 204a and 204b, respectively, of the evaporator coil 204 is operably coupled to corresponding flow control valves, 216 and 218, in order to control the flow of the chilled fluidic material through the evaporator coil 204. In an exemplary embodiment, the inlets and outlets, 204a and 204b, are provided in the form of removable umbilical connections that extend upwardly out of the housing 102. The control valves 216 are also operably coupled to the outlet of a pump 220, and the inlet of the pump 220 is operably coupled to a source 222 of a chilled fluid. In an exemplary embodiment, the chilled fluid may, for example, be a mixture of water and glycol, or any chilled refrigerant. A controller 224 is operably coupled to the pump 220 for controlling the operation of the pump. In this manner, one or more of the apparatus 100 may be operated to chill perishable items by pumping a chilled fluid through the evaporator coils 204 while operating the fans 200 of the apparatus thereby generating a cooling air stream. In an exemplary embodiment, the controller 224 may also communicate with the controllers 202 of the apparatus 100 in order to coordinate the monitoring and control of one or more the apparatus. In this manner, as illustrated in FIG. 2, a system 230 for cooling perishable items is provided that permits a plurality of the apparatus 100 to be operated under the control of the controller 224.

In an exemplary embodiment, one or more conventional wheel retraction devices 250 are positioned within the hollow portions, 116 and 118, and coupled to the horizontal sections, 104 and/or 106, of the apparatus 100, and conventional rollers 252 are coupled to the lower ends of the wheel retraction devices. In one mode of operation, the devices 250 are operated to position the rollers 252 within the hollow portions, 116 and 118, of the housing 102. In another mode of operation, the devices 250 are operated to position the rollers 252 extending out of the hollow portions, 116 and 118, of the housing 102. In this manner, the apparatus 100 may be wheeled along the surface of the floor and then, once repositioned, the devices 250 may be operated to position the rollers 252 back within the hollow portions, 116 and 118, of the housing 102 in a retracted position.

In an exemplary embodiment, during operation of the apparatus 100, as illustrated in FIG. 15, perishable food items 300 may be placed on the horizontal sections, 104 and 106, of the apparatus. A chilled fluidic material such as, for example, a mixture of water and glycol, or any refrigerant, may then be pumped through the evaporator coil 204 by operation of the valves, 216 and 218, and pump 220 under the control of the controller 224. The fan 200 and UV light 206 may then be operated under the control of the controller 202. As a result, air may be drawn from the hollow portions, 116 and 118, into the lower portion of the vertical passage 142. As a result, the air may be cooled by operation of the evaporator coil 204 and mold, bacteria, and other organisms within the air killed by operation of the UV lights 206. The air may then pass into the upper portion of the vertical passage 142 and then out of the passageways, 144 and 146, defined on the vertical walls, 132 and 134, respectively. The air passing out of the passageways, 144 and 146, then passes over the food items 300 thereby cooling the food items. The air then passes around and past the food items 300 and is then drawn into the passageways, 124 and 126, defined at the outward ends of the horizontal sections, 104 and 106, respectively, and the passageways, 128 and 130, defined in the end plates 120 and 122, respectively. The air drawn into the passageways, 124 and 126, defined at the outward ends of the horizontal sections, 104 and 106, respectively, and the passageways, 128 and 130, defined in the end plates 120 and 122, respectively, is then drawn into the hollow portions, 116 and 118, and then back into the lower portion of the vertical passage 142. The resulting operation of the apparatus 100 thereby creates circulation paths, 302a and 302b, in each side of the system.

In an exemplary embodiment, the circulation paths, 302a and 302b, at least partially re-circulate air within the apparatus 100. In an exemplary embodiment, during operation of the apparatus 100, air may also be drawn into the hollow portions, 116 and 118, of the housing 102 through the passageways, 128 and 130, defined in the end plates, 120 and 122, respectively.

In an exemplary experimental embodiment of the apparatus 100, approximately 50 to 60 percent of the air circulated in the circulation paths, 302a and 302b, was re-circulated during operation of the system. As a result, the non-re-circulated air was diffused into the general immediate vicinity of the perishable items 300. As a result, the air in this general immediate vicinity of the perishable items 300 was cool, but not as cold as the air flow for cooling the perishable items. As a result, the exemplary experimental embodiment of the apparatus 100 provided a cool air zone in the general immediate vicinity of the perishable items 300 that users of the system such as, for example, test customers, found pleasant. All of the above experimental results were unexpected. Furthermore, as opposed to conventional refrigerated cabinets used for displaying produce and other food items in commercial establishments, the exemplary experimental embodiment of the food items 100 was found to provide a more accessible display system for cooling produce and other perishable items such as, for example, flowers.

In an exemplary embodiment, the vertical positions of the air passageways, 144 and 146, permit the air to be circulated over the top surfaces of the perishable items 300.

In an exemplary embodiment, each of the circulation paths, 302a and 302b, provide up to about 2,000 to 3,000 cubic feet per minute of circulation.

In an exemplary embodiment, the housing 102 of the apparatus 100 may include one or more removable panels to permit access to the interior of the housing to permit installation and/or maintenance of the equipment within the housing.

In an exemplary embodiment, the passageway 144 in the vertical wall 132 is positioned in opposing relation to passageway 146 in the vertical wall 134.

In an exemplary embodiment, each of the passageways, 144 and 146, include slot diffusers that may provide laminar air flow over the perishable items 300. In an exemplary embodiment, the slot diffusers, 144 and 146, provide an exit velocity of less than about 700 feet per minute of the air discharged over the food items 300 that may provide enhanced re-circulation of the air in the apparatus 100.

In an exemplary embodiment, the apparatus 100 may be positioned within a commercial establishment using a conventional fork lift whereby the forks of the fork lift are inserted into the hollow portions, 116 and 118, of the housing 102. In this manner, the apparatus 100 may be easily and efficiently positioned within a commercial establishment. In an exemplary embodiment, the apparatus 100 may then be repositioned within the commercial establishment by operating the wheel retraction devices 250 and rollers 252 as described above.

In an exemplary embodiment, the apparatus 100 may provide the following performance characteristics:

PERFORMANCE                      PERFORMANCE
CHARACTERISTIC                   CHARACTERISTIC VALUE
Air flow rate over the coils 204 2,000 to 3,000 cubic feet per minute
Number of fans 200               2-4
Air Temperature into the coils   75 degrees F. dry bulb/64 degrees F.
204                              wet bulb
Air temperature leaving the      35 degrees F. dry bulb/34 degrees F.
coils 204                        wet bulb

Referring to FIG. 16, an exemplary embodiment of an apparatus 400 for cooling perishable items is substantially identical in design and operation to the apparatus 100 with the addition of air flow guides, 402 and 404, and passageways, 406 and 408. In particular, the flow guides, 402 and 404, are coupled to the vertical side walls, 132 and 134, respectively, of the housing 102 for guiding the flow of air out of the passageways, 144 and 146, respectively. The flow paths provided by the flow guides, 402 and 404, direct the air flow in a downward direction onto and over the perishable items 300 positioned on the horizontal sections, 104 and 106, of the apparatus 400. The passageways, 406 and 408, are defined within the horizontal sections, 104 and 106, respectively, of the housing 102 of the apparatus 100 proximate the vertical side walls, 132 and 134. In an exemplary embodiment, during the operation of the apparatus 400, air may be drawn into the hollow portions, 116 and 118, of the housing 102 of the apparatus.

In an exemplary experimental embodiment of the apparatus 400, the apparatus was operated and the operating temperatures of the air flow and the perishable food items 300 were monitored at various locations within the apparatus. In particular, the temperature was monitored at the following locations during the operation of the apparatus 400:

Item	Location of Temperature Monitored	Operating Temperature
T1	Discharge from passageway 144	38 F.
T2	Discharge from passageway 146	36 F.
T3	Inlet to passageway 124	49 F.
T4	Inlet to passageway 126	49 F.
T5	Ambient	69 F.
T6	Food items	38 to 45 F.

The exemplary experimental results described and illustrated above were unexpected.

In an exemplary embodiment, the system 230 may include one or more of the apparatus 100 and/or 400.

Referring now to FIG. 17, an exemplary embodiment of a system 500 for cooling perishable items is substantially identical in design and operation to the system 230 with the exception that a conventional refrigeration system 502 is substituted for the pump 220 and source of chilled fluid 222, the outlet valves 218 are removed, and expansion valves 504 are provided on the inlet sides of the evaporator coils 204.

Referring to FIG. 18, an exemplary embodiment of an apparatus 600 for cooling perishable items is substantially identical in design and operation to the apparatus 100 with an on-board refrigeration system 602 that includes the evaporator coil 204, a compressor 604, a condenser coil 606 and an expansion valve 608 that are positioned within the housing 102 of the apparatus. The design and operation of the on-board refrigeration system 602 is conventional and permits the apparatus 600 to be a self-contained cooling system.

In an exemplary embodiment, the systems 230 and 500 may be combined with one or more of the apparatus 600.

Referring now to FIG. 19, a system 700 for cooling produce, or other perishable items, includes one or more apparatus 702 for cooling perishable items that are each operably coupled to an overhead control and supply system 704 by corresponding releasable umbilicals 706. In an exemplary embodiment, the system 700 may be positioned within a commercial building 708 such as, for example, a warehouse sales establishment. In an exemplary embodiment, the apparatus 702 may be the apparatus 100 and/or 400. In an exemplary embodiment, the system 704 may include one or more of the pump 220, the source 222, the controller 224, or the refrigeration system 502. In an exemplary embodiment, the umbilicals 706 may permit cooling fluids to be circulated to the apparatus 702, electrical power and control signals to be provided to, and drainage of condensation to be removed from the apparatus.

In an exemplary embodiment, the system 700 further includes one or more unused umbilicals 706 that may permit one or more of the apparatus 702 to be repositioned within the building 708. In this manner, an operator of the commercial building 708 may easily reposition one or more of the apparatus 702 to adjust the flow of customers through the commercial building 708.

In an exemplary embodiment, the apparatus 100, 400, and 600 and the systems 230, 500, and 700 provide islands of displays for produce or other food items within a commercial establishment, without any side-wall or barrier panels of any kind.

In an exemplary embodiment, the apparatus 100, 400, and 600 direct a laminar flow of chilled air onto and over perishable food items 300. As a result, in an exemplary embodiment, a halo or compact zone of low temperature air surrounds the perishable items 300. In an exemplary embodiment, as perishable food items 300 are sold, personnel of the commercial establishment may remove the containers in which the perishable food items are presented on the systems. In an exemplary embodiment, the empty apparatus 100, 400, and 600 may then be removed by a fork lift operator and replaced with a new apparatus that is loaded with perishable food items 300.

In an exemplary embodiment, the use of the systems, 230, 500 and/or 700, in a commercial establishment permit the commercial establishment to provide a virtually unlimited number of traffic flow configurations. As a result, a novel buying experience may be provided that still maintains perishable items at their proper freshness and quality.

In an exemplary embodiment, the cooling fluid used in the systems 100 and/or 1102 is chilled water and glycol.

In an exemplary embodiment, one or more of the passageways, 144 and 146, of the housing 102 include nozzles that direct air flow within the circulation paths, 302a and 302b, over the perishable food items 300.

In an exemplary embodiment, the temperature of the coolant fluid that runs through the coils 204 and/or the air within the circulation paths, 302a and 302b, of the apparatus 100, 400 and/or 600 is monitored and fed back to the controllers 202 and/or the central controller 224.

In an exemplary embodiment, the condensate pump 208 of the apparatus 100, 400 and/or 600 is operated in combination with a timed defrost cycle which periodically permits ice that may collect on the coils 204 to defrost and then the moisture captured by the condensate drain pans 210.

In an exemplary embodiment, other types of conventional refrigeration systems be substituted for, or used in addition to, the coils 204 and/or the refrigeration system 602 to cool the air within the circulation paths, 302a and 302b.

It is understood that variations may be made in the above without departing from the scope of the invention. For example, the teachings of the present exemplary embodiments may be used to cool any item, whether a food item or not, and whether perishable or not. Further, spatial references are for the purpose of illustration only and do not limit the specific orientation or location of the structure described above. While specific embodiments have been shown and described, modifications can be made by one skilled in the art without departing from the spirit or teaching of this invention. The embodiments as described are exemplary only and are not limiting. Many variations and modifications are possible and are within the scope of the invention. Accordingly, the scope of protection is not limited to the embodiments described, but is only limited by the claims that follow, the scope of which shall include all equivalents of the subject matter of the claims.

Claims

1. A portable system for cooling perishable items, comprising: a housing adapted to rest on a surface that comprises: first and second horizontal surfaces for supporting perishable items, wherein each horizontal surface defines flow passages at an end thereof;a vertical structure positioned between and extending upwardly from the horizontal surfaces that defines an internal vertical passage, a first set of horizontal passages extending from the internal vertical passage in the direction of the first horizontal surface, and a second set of horizontal passages extending from the internal vertical passage in the direction of the second horizontal surface; anda plurality of spaced apart supports coupled to and extending downwardly from the horizontal surfaces for supporting the housing on the surface, wherein the supports define a flow passage therebetween;a first air circulation path comprising the flow passage defined in the end of the first horizontal surface, the internal vertical passage of the vertical structure, the first set of horizontal passages extending from the internal vertical passage in the direction of the first horizontal surface, and the flow passage defined between the supports;a second air circulation path comprising the flow passage defined in the end of the second horizontal surface, the internal vertical passage of the vertical structure, the second set of horizontal passages extending from the internal vertical passage in the direction of the second horizontal surface, and the flow passage defined between the supports;a refrigeration system coupled to the housing for cooling the first and second air circulation paths; andone or more disinfectant systems coupled to the housing for disinfecting the first and second air circulation paths; andwherein each of the first and second air circulation paths comprise laminar flow portions adapted to flow over perishable items positioned on the first and second horizontal surfaces.

2. A method of cooling perishable items, comprising: positioning the perishable items on a portable cooling support;cooling an air stream; andcirculating the cooled air stream over the perishable items;wherein the cooled air stream circulated over the perishable items comprises a laminar air stream.

3. The method of claim 2, further comprising: re-circulating at least a portion of the air stream.

4. The method of claim 2, further comprising: disinfecting at least a portion of the air stream.

5. The method of claim 2, wherein positioning the perishable items on a portable cooling support comprises supporting the perishable items on the portable cooling support that provides free access to the perishable items.

6. The method of claim 2, wherein cooling the air stream comprises providing a source of refrigeration within the portable cooling support.

7. The method of claim 2, wherein cooling the air stream comprises providing a source of refrigeration from outside of the portable cooling support.

8. The method of claim 7, further comprising providing a source of refrigeration at a plurality of locations within a building.

9. The method of claim 8, further comprising permitting the portable cooling support to be operably coupled to any one of the plurality of sources of refrigeration provided within the building.

10. A method of cooling perishable items, comprising: positioning the perishable items on a portable cooling support;providing an air stream;disinfecting the air stream;cooling the air stream;circulating the air stream over the perishable items; andre-circulating at least a portion of the air stream;wherein the air stream circulated over the perishable items comprises a laminar air stream;wherein positioning the perishable items on a portable cooling support comprises supporting the perishable items on the portable cooling support that provides free access to the perishable items; andwherein cooling the air stream comprises providing a plurality of sources of refrigeration throughout a building any one of which the portable cooling support may be operably coupled to.

11. A system for cooling perishable items, comprising: means for positioning the perishable items on a portable cooling support;means for cooling an air stream; andmeans for circulating the cooled air stream over the perishable items.

12. The system of claim 11, further comprising: means for re-circulating at least a portion of the air stream.

13. The system of claim 11, further comprising: means for disinfecting at least a portion of the air stream.

14. The system of claim 11, wherein the cooled air stream circulated over the perishable items comprises a laminar air stream.

15. The system of claim 11, wherein means for positioning the perishable items on a portable cooling support comprises means for supporting the perishable items on the portable cooling support that provides free access to the perishable items.

16. The system of claim 11, wherein means for cooling the air stream comprises means for providing a source of refrigeration within the portable cooling support.

17. The system of claim 11, wherein means for cooling the air stream comprises means for providing a source of refrigeration from outside of the portable cooling support.

18. The system of claim 17, further comprising means for providing a source of refrigeration at a plurality of locations within a building.

19. The system of claim 18, further comprising means for permitting the portable cooling support to be operably coupled to any one of the plurality of sources of refrigeration provided within the building.

20. A system for cooling perishable items, comprising: means for positioning the perishable items on a portable cooling support;means for providing an air stream;means for disinfecting the air stream;means for cooling the air stream;means for circulating the air stream over the perishable items; andmeans for re-circulating at least a portion of the air stream;wherein the air stream circulated over the perishable items comprises a laminar air stream;wherein means for positioning the perishable items on a portable cooling support comprises means for supporting the perishable items on the portable cooling support that provides free access to the perishable items; andwherein the means for cooling the air stream comprises means for providing a source of refrigeration at a plurality of location within a building any one of which the portable cooling support may be operably coupled to.

21. An operating system for a commercial business within a building, comprising: means for displaying perishable items on a portable cooling platform within the building at a first location;means for flowing a chilled fluidic material through a coil positioned within the platform;means for cooling an air stream by blowing air over the coil using a fan positioned within the platform;means for cooling the perishable items on the portable cooling platform using the cooled air stream; andmeans for providing the chilled fluidic material to the coil from a refrigeration system provided outside of the platform.

22. The system of claim 21, further comprising: means for permitting the chilled fluidic material to be provided to the coil from the refrigeration system at a plurality of separate chilled fluidic material supply connections provided within the building.

23. The system of claim 22, further comprising: means for disconnecting the portable cooling platform from a chilled fluidic material supply connection provided at the first location;means for relocating the portable cooling platform within the building at a second location; andmeans for connecting the portable cooling platform to a chilled fluidic material supply connection provided at the second location.

24. A system for cooling perishable items, comprising: a housing adapted to rest on a surface that includes one or more platform surfaces for supporting perishable items and defines one or more air circulation paths for cooling the perishable items supported on the platform surfaces of the housing; anda refrigeration system coupled to the housing for cooling the air circulation paths;wherein one or more of the air circulation paths comprise a diffuser for providing a laminar air flow path adapted to flow over the perishable items.

25. A method of cooling perishable items, comprising: positioning the perishable items on a portable cooling support;cooling an air stream;circulating the cooled air stream over the perishable items; andre-circulating up to about 60 percent of the air stream.

26. A method of cooling perishable items, comprising: positioning the perishable items on a portable cooling support;cooling an air stream;circulating the cooled air stream over the perishable items;re-circulating at least a portion of the air stream; andmaintaining an operating temperature of the cooled air stream over the perishable items at a temperature range of 38 to 45 degrees F.

27. A portable system for cooling perishable items, comprising: a housing adapted to rest on a surface that comprises: first and second horizontal surfaces for supporting perishable items, wherein each horizontal surface defines flow passages at an end thereof;a vertical structure positioned between and extending upwardly from the horizontal surfaces that defines an internal vertical passage, a first set of horizontal passages extending from the internal vertical passage in the direction of and below the first horizontal surface, and a second set of horizontal passages extending from the internal vertical passage in the direction of and below the second horizontal surface; anda plurality of spaced apart supports coupled to and extending downwardly from the horizontal surfaces for supporting the housing on the surface, wherein the supports define a flow passage therebetween;a first air circulation path comprising the flow passage defined in the end of the first horizontal surface, the internal vertical passage of the vertical structure, the first set of horizontal passages extending from the internal vertical passage in the direction of and below the first horizontal surface, and the flow passage defined between the supports;a second air circulation path comprising the flow passage defined in the end of the second horizontal surface, the internal vertical passage of the vertical structure, the second set of horizontal passages extending from the internal vertical passage in the direction of and below the second horizontal surface, and the flow passage defined between the supports;a refrigeration system coupled to and positioned within the vertical structure above the first and second horizontal passages for cooling the first and second air circulation paths; andone or more disinfectant systems coupled to the housing for disinfecting the first and second air circulation paths; andwherein each of the first and second air circulation paths comprise laminar flow portions adapted to flow over perishable items positioned on the first and second horizontal surfaces.