Dual flow heat exchanger header
An A-coil heat exchanger includes a header for receiving a heat transfer fluid after the fluid has passed through the interior of the heat exchanger. The header is comprised of a main body section and first and second tubular branches depending therefrom. The first tubular branch is in fluid communication with a first coil slab of the heat exchanger by means of a first set of adapter tubes extending between the first tubular section and the first coil slab. The second tubular branch is in fluid communication with a second coil slab of the heat exchanger by means of a second set of adapter tubes extending between the second tubular branch and the second coil slab. Each of the adapter tubes defines a generally straight section of conduit between the corresponding tubular branch and the corresponding coil slab. The header is located with respect to the coil slabs such that when the heat exchanger is positioned in an air stream, the header is substantially isolated from air flowing through the first and second coil slabs.
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This invention relates generally to heat exchangers used in air conditioning and refrigeration applications and in particular to heat exchangers of the A-coil type.
BACKGROUND ARTHeat exchangers are widely used in a variety of applications in the fields of air conditioning, refrigeration and the like. Typically, such heat exchangers are comprised of plural rows of tubes in which a first heat transfer fluid, such as water or a vapor compression refrigerant, flows while a second heat transfer fluid, such as air, is directed across the outside of the tubes. To improve heat transfer, a plurality of fins comprising thin sheets of metal are used. Each fin has multiple holes through which the tubes are laced and the fins are arranged in parallel, closely spaced relationship along the tubes to define multiple paths for the second heat transfer fluid to flow across the fins and around the tubes.
One type of heat exchanger often used in air conditioning and refrigeration applications is the so-called “A-coil” heat exchanger, an example of which is shown in
Four rows of tubes 18 (two rows on each slab 12, 14) are shown in
Four adapter tubes 26 connect the outlets of the respective tube circuits to an outlet header 28 in fluid communication with the suction side of a compressor (not shown) when heat exchanger 10 is used in a vapor compression air conditioning or refrigeration system. Header 28 extends horizontally across heat exchanger 10 proximate to the coupled ends of slabs 12, 14, and then bends upwardly at an approximately 90° angle. Although not shown in
In operation, when heat exchanger 10 is used as an evaporator, the refrigerant enters heat exchanger 10 through the distributor tubes in substantially liquid form, makes multiple passes through heat exchanger 10 in each tube circuit, is substantially vaporized in heat exchanger 10 and exits heat exchanger 10 through adapter tubes 26. Further, when heat exchanger 10 is oriented in a “horizontal coil” configuration, as shown in
In accordance with the present invention, a heat exchanger of the A-coil type having first and second coil slabs coupled at respective ends thereof and being in divergent relationship includes a header adapted to receive heat transfer fluid from the slabs. The header has a main section and first and second tubular branches sections depending therefrom. The first branch is in fluid communication with the first coil slab and the second branch is in fluid communication with the second coil slab.
In accordance with one embodiment of the invention, the heat exchanger further includes a first conduit in fluid communication between the first branch and the first coil slab and a second conduit in fluid communication between the second branch and the second coil slab.
In accordance with another embodiment of the invention, the first conduit defines a generally straight section of conduit between the first branch and the first coil slab and the second conduit defines a generally straight section of conduit between the second branch section and the second coil slab.
In accordance with yet another embodiment of the invention, the first conduit extends from the first branch in a first direction and the second conduit extends from the second branch in a second direction which is in divergent relationship to the first direction.
In accordance with still another embodiment of the invention, the header is located with respect to the first and second coil slabs such that when the heat exchanger is positioned in an air stream, the header is substantially isolated from air flowing through the first and second coil slabs.
In accordance with a preferred embodiment of the invention, the heat exchanger includes plural first conduits in fluid communication between the first branch and the first coil slab and plural second conduits in fluid communication between the second branch and the second coil slab. The first and second branches are in generally parallel relationship and extend generally parallel to an axis along which the first and second coil slabs are coupled.
The best mode for carrying out the invention will now be described with reference to the accompanying drawings. Like parts are marked in the specification and drawings with the same respective reference numbers. In some instances, proportions may have been exaggerated in order to depict certain features of the invention.
Referring now to
Four rows of tubes 38 (two rows on each slab 32,34) are shown in
As will be described in greater detail hereinbelow, a first pair of adapter tubes 46 and a second pair of adapter tubes 47 connect the outlets of the respective tube circuits to an outlet header 48 in fluid communication with the suction side of a compressor (not shown) when heat exchanger 30 is used in a vapor compression air conditioning or refrigeration system. When heat exchanger 30 is oriented for horizontal air flow, as shown in
In operation, when heat exchanger 30 is used as an evaporator, the refrigerant enters heat exchanger 30 through the distributor tubes in substantially liquid form, makes multiple passes through heat exchanger 30 in each tube circuit, is substantially vaporized in heat exchanger 30 and exits heat exchanger 30 through adapter tubes 46, 47. Further, when heat exchanger 30 is oriented in a “horizontal coil” configuration, as shown in
As can be best seen in
Adapter tubes 46 are in divergent relationship with respect to adapter tubes 47, corresponding to the divergent relationship between slabs 32 and 34. Further, the two tubes 46 are stacked vertically one above the other and the two tubes 47 are stacked vertically one above the other, so that each adapter tube 46, 47 defines a generally straight section of conduit between the corresponding tubular branch 52, 54 and the corresponding coil slab 32, 34. One skilled in the art will recognize that the aforementioned configuration of adapter tubes 46,47 eliminates the need for one or more bends in the adapter tubes characterized by prior art A-coil heat exchangers.
As can be best seen in
The best mode for carrying out the invention has now been described in detail. Since changes in and modifications to the above-described preferred embodiment may be made without departing from the nature, spirit and scope of the invention, the invention is not to be limited to said details, but only by the appended claims and their equivalents.
Claims
1. In a heat exchanger having first and second coil slabs coupled at respective ends thereof and being in diverging relationship to define an A-coil configuration, each of said slabs having at least one heat transfer carrying tube, wherein the improvement comprises a header adapted to receive heat transfer fluid from said slabs, said header having a main section and first and second branch sections depending therefrom, said first branch section being in fluid communication with said first coil slab and said second branch section being in fluid communication with said second coil slab.
2. The heat exchanger of claim 1 further including a first conduit in fluid communication between said first branch section and said first coil slab and a second conduit in fluid communication between said second branch section and said second coil slab.
3. The heat exchanger of claim 2 wherein said first conduit defines a generally straight section of conduit between said first branch section and said first coil slab and said second conduit defines a generally straight section of conduit between said second branch section and said second coil slab.
4. The heat exchanger of claim 2 further including plural first conduits in fluid communication between said first branch section and said first coil slab and plural second conduits in fluid communication between said second branch section and said second coil slab.
5. The heat exchanger of claim 2 wherein said first conduit extends from said first branch section in a first direction and said second conduit extends from said second branch section in a second direction which is in divergent relationship to said first direction.
6. The heat exchanger of claim 1 wherein said first and second branch sections are in generally parallel relationship.
7. The heat exchanger of claim 6 wherein said main section and said first and second branch sections extend generally parallel to an axis along which said first and second coil slabs are coupled.
8. The heat exchanger of claim 1 wherein said heat exchanger is positionable for horizontal air flow therethrough, said main section and said first and second branch sections having respective major axes that are in parallel relationship, said respective major axes being oriented vertically when said heat exchanger is positioned for horizontal air flow therethrough.
9. The heat exchanger of claim 1 wherein said header is located proximate to the coupled ends of said first and second coil slabs such that when said heat exchanger is positioned in an air stream, said header is substantially isolated from air flowing through said first and second coil slabs.
10. A header adapted for connection to an A-coil heat exchanger to receive heat transfer fluid therefrom, said header comprising a main section and first and second branch sections depending therefrom, said first branch section being adapted to receive heat transfer fluid from a first portion of the heat exchanger and said second branch section being adapted to receive heat transfer fluid from a second portion of the heat exchanger.
11. The header of claim 10 further including at least one first conduit extending from said first branch section and being adapted to feed heat transfer fluid from the first portion of the heat exchanger to said first branch section, said header further including at least one second conduit extending from said second branch section and being adapted to feed heat transfer fluid from the second portion of the heat exchanger to said second branch section.
12. The header of claim 11 wherein said first conduit defines a generally straight first section of conduit and said second conduit defines a generally straight second section of conduit.
13. The header of claim 11 further including plural first conduits extending from said first branch section and plural second conduits extending from said second branch section.
14. The header of claim 11 wherein said first conduit extends from said first branch section in a first direction and said second conduit extends from said second branch section in a second direction which is in divergent relationship to said first direction.
15. The header of claim 10 wherein said first and second branch sections are in generally parallel relationship.
16. The header of claim 15 wherein said main section and said first and second branch sections each have a major axis and a minor axis, the respective major axes of said main section and said first and second branch sections being in generally parallel relationship.
17. In combination:
- a heat exchanger having first and second coil slabs coupled at respective ends thereof and being in diverging relationship to define an A-coil configuration, each of said slabs having a passageway adapted for heat transfer fluid to pass therethrough; and
- a header in fluid communication with said slabs to receive heat transfer fluid after the fluid has passed through said slabs, said header having a main body section and first and second tubular branches depending therefrom, said first tubular branch being in fluid communication with said first coil slab and said second tubular branch being in fluid communication with said second coil slab, said header being located proximate to the coupled ends of said first and second coil slabs such that when said heat exchanger is positioned in an air stream, said header is substantially isolated from air flowing through said first and second coil slabs.
18. The combination of claim 17 further including plural first conduits in fluid communication between said first tubular branch and said first coil slab and plural second conduits in fluid communication between said second tubular branch and said second coil slab.
19. The combination of claim 18 wherein said each of first conduits defines a generally straight section of conduit between said first tubular branch and said first coil slab and each of said second conduits defines a generally straight section of conduit between said second tubular branch and said second coil slab.
20. The combination of claim 19 wherein said first conduits extend from said first tubular branch section in respective first directions and said second conduits extend from said second tubular branch in respective second directions which are in divergent relationship to said respective first directions.
Type: Application
Filed: Jul 17, 2006
Publication Date: Jan 17, 2008
Applicant:
Inventors: James F. Timbs (Winona, MS), James W. Pickle (Grenada, MS), Colby W. Logan (Grenada, MS), John L. Bauer (Grenada, MS)
Application Number: 11/488,106
International Classification: F28D 1/04 (20060101);