Compact heat exchanger assembly for refrigeration systems

Abstract

To provide an improved heat exchanger assembly.SOLUTION: A compact heat exchanger assembly for a refrigeration system includes a heat rejection heat exchanger assembly and a heat absorption heat exchanger assembly. The heat rejection heat exchanger assembly includes a primary heat exchanger and a secondary heat exchanger. The primary heat exchanger has a tube bank extending between a first manifold and a second manifold. The tube bank is provided with at least one bend such that the primary heat exchanger has a generally curvilinear shape. The secondary heat exchanger is disposed between the first manifold and the second manifold.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] (Cross - Reference to Related Applications) This application claims the benefit of U.S. Patent Application No. 62 / 758,820, filed on November 12, 2018, which is hereby incorporated by reference in its entirety.

[0002] Exemplary embodiments relate to the technology of refrigeration systems.

Background Art

[0003] Refrigeration systems are widely used as part of air - conditioning systems for buildings, cargo systems, storage systems, etc. Refrigeration systems typically use various components connected by refrigerant lines in a closed circuit. Generally, refrigeration systems operate on a sub - critical refrigeration cycle where the refrigeration system operates below the critical point of the refrigerant. Currently, it is being promoted that the refrigeration system operates on a transcritical refrigeration cycle where the refrigeration system operates above the critical point of the refrigerant.

[0004] The operational envelope of the compression device of a multi - stage compression system may be extended by incorporating an additional heat exchanger between two compression stages. Incorporating an additional heat exchanger into a vapor - compression refrigeration system may present challenges due to limitations in space availability, weight, and equipment cost considerations.

Summary of the Invention

Means for Solving the Problems

[0005] Disclosed is a refrigeration system including a compressor assembly, a thermal insulation heat exchanger assembly, and a thermal absorption heat exchanger assembly. The compressor assembly has an inlet for a first compression stage, an outlet for a first compression stage, an inlet for a second compression stage, and an outlet for a second compression stage. The thermal insulation heat exchanger assembly includes a primary heat exchanger and a secondary heat exchanger. The primary heat exchanger has an inlet that is fluid-connected to the outlet for a second compression stage of the compressor assembly, and an outlet that is fluid-connected to the inlet for a thermal absorption heat exchanger assembly. The primary heat exchanger includes a first tube bank extending between a first manifold and a first intermediate manifold, a second tube bank extending between a second manifold and a second intermediate manifold, at least one bend extending between the first tube bank and the second tube bank, and connecting pipes extending between the first intermediate manifold and the second intermediate manifold. The secondary heat exchanger has a third manifold defining an inlet that is fluid-connected to the outlet of the first compression stage of the compressor assembly, and a fourth manifold defining an outlet that is fluid-connected to the inlet of the second compression stage of the compressor assembly. The heat absorption heat exchanger assembly is fluid-connected to the heat blockage heat exchanger assembly and the compressor assembly.

[0006] Also disclosed is a compact heat exchanger assembly including a heat-insulating heat exchanger assembly that includes a primary heat exchanger and a secondary heat exchanger. The primary heat exchanger has a first tube bank extending from a first manifold, a second tube bank extending from a second manifold, at least one bend configured to connect the first tube bank and the second tube bank, and a bend comprising the first tube bank and the second tube bank such that at least a portion of the first tube bank is positioned parallel to the second tube bank. The secondary heat exchanger is positioned between the second manifold and at least one bend.

[0007] Further disclosed is a compact heat exchanger assembly including a heat-insulating heat exchanger assembly. The heat-insulating heat exchanger assembly includes a primary heat exchanger and a secondary heat exchanger. The primary heat exchanger has a tube bank extending between a first manifold and a second manifold. The tube bank has at least one bend so that the primary heat exchanger has a generally curved shape. The secondary heat exchanger is located between the first manifold and the second manifold.

[0008] The following description should not be considered restrictive. Similar elements are numbered similarly in the attached drawings. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic diagram of the refrigeration system. [Figure 2] This is a schematic diagram of another refrigeration system. [Figure 3] This is a schematic diagram of a first embodiment of a heat exchanger assembly with a refrigeration system. [Figure 4] This is a schematic diagram of a second embodiment of a heat exchanger assembly with a refrigeration system. [Figure 5] This is a schematic diagram of a third embodiment of a heat exchanger assembly with a refrigeration system. [Figure 6] This is a schematic diagram of a fourth embodiment of a heat exchanger assembly with a refrigeration system. [Figure 7] This is a schematic diagram of a fifth embodiment of a heat exchanger assembly with a refrigeration system. [Modes for carrying out the invention]

[0010] A detailed description of one or more embodiments of the disclosed apparatus and method is presented herein by reference to the figures, not as an limitation but as an illustration.

[0011] Referring to Figures 1 and 2, a refrigeration system 10 with two-stage compression is schematically shown. The refrigeration system 10 uses a primary fluid and a secondary fluid. The primary fluid is a working fluid for the refrigeration system, which may be a refrigerant such as carbon dioxide (CO2), and the secondary fluid may be air, water, glycol, or other secondary fluids. The refrigeration system 10 includes a compressor assembly 20, a thermal insulation heat exchanger assembly 22 for thermal insulation, and a thermal absorption heat exchanger assembly 24 for thermal absorption.

[0012] The compressor assembly 20 is a two-stage compressor assembly comprising a first compressor stage 30 having an inlet 32 ​​and an outlet 34 for the first compression stage, and a second compressor stage 40 having an inlet 42 and an outlet 44 for the second compression stage. The first compressor stage 30 may be formed integrally with the second compressor stage 40, or the first compressor stage 30 may be provided as the first compressor and the second compressor stage 40 may be provided as a second compressor separate from the first compressor.

[0013] The inlet 32 ​​of the first compression stage is configured to receive refrigerant from the heat absorption heat exchanger assembly 24 via a port (heat absorption heat exchanger assembly outlet 112). The refrigerant is compressed by the first compressor stage 30, and the outlet 34 of the first compression stage is configured to release the compressed refrigerant to a portion of the heat blockage heat exchanger assembly 22.

[0014] The inlet of the second compression stage 42 is configured to receive refrigerant from the thermal insulation heat exchanger 22 and from the flash tank economizer 162 or heat exchanger type economizer 182, as described below. The refrigerant is compressed by the second compressor stage 40, and the outlet 44 of the second compression stage is configured to release the compressed refrigerant to another part of the thermal insulation heat exchanger assembly 22.

[0015] The thermal insulation heat exchanger assembly 22 includes a primary heat exchanger 50, a secondary heat exchanger 52, and a thermal insulation fan 54. The primary heat exchanger 50 and the secondary heat exchanger 52 may be configured as condensers for a subcritical refrigeration system, or as gas coolers and intercoolers for a transcritical refrigeration system. The primary heat exchanger 50 and the secondary heat exchanger 52 are configured to form a closed shape, closed duct, or closed space having a "U", "V", "O", or other shape in which the thermal insulation fan 54 may be located. The primary heat exchanger 50 and the secondary heat exchanger 52 form a thermal insulation heat exchanger assembly 22 in which the two heat exchangers share a common thermal insulation fan 54.

[0016] Referring to Figure 3, the primary heat exchanger 50 includes a first tube bank 60 and a second tube bank 62. The first tube bank 60 is positioned parallel to the second tube bank 62 so that the primary heat exchanger 50 is configured as a two-row heat exchanger. In each tube bank, fins may be positioned between the tubes to enhance heat transfer. The first tube bank 60 extends between the first manifold 70 and the first intermediate manifold 72. The first tube bank 60 may define at least one finned bend between the first manifold 70 and the first intermediate manifold 72 so that the first tube bank 60 has a generally curved or U-shaped form. The first manifold 70 includes or defines a primary heat exchanger inlet 80 which is fluidly connected to the outlet 44 of the second compression stage of the second compressor stage 40 of the compressor assembly 20, as shown in Figures 1 and 2.

[0017] The second tube bank 62 extends between the second intermediate manifold 74, which is located adjacent to the first intermediate manifold 72, and the second manifold 76, which is located adjacent to the first manifold 70. The first intermediate manifold 72 is fluidly connected to the second intermediate manifold 74 by a single (or optionally multiple) connecting pipes 78. The second tube bank 62 may define at least one finned bend between the second intermediate manifold 74 and the second manifold 76 such that the second tube bank 62 generally has a curved or U-shaped shape. The second manifold 76 includes or defines a primary heat exchanger outlet 82 which is fluidly connected to the inlet 110 of the heat absorption heat exchanger assembly 24 through an expansion device and an economizer (e.g., a flash tank type economizer or a heat exchanger type economizer), as shown in Figures 1 and 2.

[0018] Continuing to refer to Figure 3, the secondary heat exchanger 52 is partially located within the primary heat exchanger 50. The secondary heat exchanger 52 includes a tube bank section 90 extending between the third manifold 92 and the fourth manifold 94. The third manifold 92 is located adjacent to the second intermediate manifold 74. The gap between the second intermediate manifold 74 and the third manifold 92 is sealed with some sealing material or sealing member 96 (e.g., foam, rubber) to avoid air bypass. The third manifold 92 includes or defines a secondary heat exchanger inlet 98 which is fluidly connected to the outlet 34 of the first compression stage of the first compressor stage 30 of the compressor assembly 20, as shown in Figures 1 and 2. The fourth manifold 94 is located adjacent to the second manifold 76. The gap between the fourth manifold 94 and the second manifold 76 is blocked by some sealing material or sealing member 96 to prevent air from circumventing. The fourth manifold 94 includes or defines a secondary heat exchanger outlet 102 from which the refrigerant coupled with the refrigerant from the flash tank economizer 162 or the heat exchanger economizer 182 enters the inlet 42 of the second compression stage of the second compressor stage 40 of the compressor assembly 20, as shown in Figures 1 and 2.

[0019] The heat cutoff fan 54 is disposed within a closed space defined by the tube bank section 90 of the secondary heat exchanger 52, as well as the first and second tube banks 60 and 62 of the primary heat exchanger 50. The heat cutoff fan 54 is configured to promote the flow of a secondary fluid through the primary heat exchanger 50 and the secondary heat exchanger 52 to cool the refrigerant flowing through the primary heat exchanger 50 and / or the secondary heat exchanger 52. The sealing members 96, 100 suppress the leakage of the secondary fluid through the gap between the primary heat exchanger 50 and the secondary heat exchanger 52.

[0020] Referring to FIG. 4, the primary heat exchanger 50 may be a continuous tube bank that is folded onto itself such that the tubes define a first tube bank section 120, a second tube bank section 122, and at least one finless bend 124. At least one finless bend (124) enables the first tube bank section (120) to be arranged parallel to the second tube bank section (122) such that the primary heat exchanger (50) is configured as a two-row heat exchanger. The first tube bank section 120 extends between the first manifold 130 and the finless bend 124. The first manifold 130 includes or defines a primary heat exchanger inlet 80 that is fluidly connected to an outlet 44 of a second compression stage of the second compressor stage 40 of the compressor assembly 20 as shown in FIGS. 1 and 2. The second tube bank section 122 extends between the finless bend 124 and the second manifold 132. The second manifold 132 includes or defines a primary heat exchanger outlet 82 that is fluidly connected to an inlet 110 of the heat absorption heat exchanger assembly 24 through an expansion device and an economizer as shown in FIGS. 1 and 2.

[0021] The first tube bank section 120 and the second tube bank section 122 may include finned bends in addition to the finless bend 124 such that the combination of the first tube bank section 120 and the second tube bank section 122 generally has a curved or U-shaped configuration.

[0022] Referring to FIG. 4, the secondary heat exchanger 52 has a configuration substantially similar to the secondary heat exchanger 52 shown in FIG. 3. The secondary heat exchanger 52 includes a tube bank section 90 extending between a third manifold 92 and a fourth manifold 94.

[0023] As shown in FIG. 4, the third manifold 92 is disposed adjacent to the finless bend 124. A sealing member 96 is used to prevent air leakage through the gap between the third manifold 92 and the finless bend 124. The third manifold 92 includes or defines a secondary heat exchanger inlet 98 that is fluidly connected to the outlet 34 of the first compression stage of the first compressor stage 30 of the compressor assembly 20 as shown in FIGS. 1 and 2.

[0024] Referring to FIG. 4, the fourth manifold 94 is disposed adjacent to the second manifold 132. The gap between the fourth manifold 94 and the second manifold 132 is blocked by a sealing member 100. The fourth manifold 94 is combined with the refrigerant from the economizer and includes or defines a secondary heat exchanger outlet 102 that is fluidly connected to the inlet of the second compression stage of the second compressor stage 40 of the compressor assembly 20 as shown in FIGS. 1 and 2.

[0025] Referring to FIG. 5, the primary heat exchanger 50 may have a configuration substantially similar to that shown in FIG. 4. However, in this embodiment, the secondary heat exchanger 52 includes a continuous tube bank in which the tubes are folded onto itself to define a third tube bank section 140, a fourth tube bank section 142, and at least one finless bend 144. At least one finless bend 144 allows the third tube bank section 140 to be arranged parallel to the fourth tube bank section 142 so that the secondary heat exchanger 52 is configured as a two-row heat exchanger.

[0026] A third tube bank section 140 extends between a third manifold 146 and a finless bend 144. The third manifold 146 includes or defines a secondary heat exchanger inlet 98, which is fluid-connected to the outlet 34 of the first compression stage of the first compressor stage 30 of the compressor assembly 20, as shown in Figures 1 and 2. A fourth tube bank section 142 extends between a finless bend 144 and a fourth manifold 148. The fourth manifold 148 includes or defines a secondary heat exchanger outlet 102, which, after being coupled with a refrigerant from the economizer, is fluid-connected to the inlet 42 of the second compression stage of the second compressor stage 40 of the compressor assembly 20, as shown in Figures 1 and 2. The gap between the primary heat exchanger 50 and the secondary heat exchanger 52 is separated by sealing materials 150 and 152.

[0027] The thermal insulation fan 54 is positioned within a closed "O"-shaped space defined by the primary heat exchanger 50 and the secondary heat exchanger 52. The thermal insulation fan 54 is configured to facilitate the flow of secondary fluid through the primary heat exchanger 50 and the secondary heat exchanger 52 to cool the refrigerant. Sealing materials 150, 152 may be sealing members that prevent leakage of secondary fluid through the gap between the primary heat exchanger 50 and the secondary heat exchanger 52.

[0028] Referring to Figure 6, the primary heat exchanger 50 is a single-row heat exchanger without fins or bends. The first tube bank section 120 (configured as a single-row tube bank) extends between the first manifold 130 and the second manifold 132. The first manifold 130 includes or defines a primary heat exchanger inlet 80 which is fluidly connected to the outlet 44 of the second compression stage of the second compressor stage 40 of the compressor assembly 20, as shown in Figures 1 and 2. The second manifold 132 includes or defines a primary heat exchanger outlet 82 which is fluidly connected to the inlet 110 of the heat absorption heat exchanger assembly 24 through an expansion device and an economizer, as shown in Figures 1 and 2. The single-row tube bank 120 may have fins or bends so that the primary heat exchanger generally has a curved or U-shaped form.

[0029] The secondary heat exchanger 52 is also a single-row heat exchanger extending between the third manifold 92 and the fourth manifold 94. The third manifold 92 includes or defines a secondary heat exchanger inlet 98 which is fluid-connected to the outlet 34 of the first compression stage of the first compressor stage 30 of the compressor assembly 20. The fourth manifold 94 includes or defines a secondary heat exchanger outlet 102 which, after being coupled with the refrigerant from the economizer, is fluid-connected to the inlet 42 of the second compression stage of the second compressor stage 40 of the compressor assembly 20, as shown in Figures 1 and 2.

[0030] The primary heat exchanger 50 and the secondary heat exchanger 52 form a closed configuration. The gap between the primary heat exchanger 50 and the secondary heat exchanger 52 is blocked by sealing members 96 and 100 to prevent flow from bypassing the primary heat exchanger 50 and the secondary heat exchanger 52.

[0031] The thermal insulation fan 54 is positioned within a closed space defined by the primary heat exchanger 50 and the secondary heat exchanger 52. The thermal insulation fan 54 is configured to facilitate the flow of secondary fluid through the primary heat exchanger 50 and the secondary heat exchanger 52 to cool the refrigerant.

[0032] Referring to Figure 7, the primary heat exchanger 50 and secondary heat exchanger 52 have a substantially similar configuration to the primary heat exchanger 50 and secondary heat exchanger 52 shown in Figure 3. The only difference is that the first intermediate manifold 72 is fluidly connected to the second intermediate manifold 74 by a single (or optionally multiple) block section 78A consisting of a block 197 having flow communication holes 199 and a mounting tab 198 having screw holes 201. The communication holes 199 function as refrigerant passages, enabling the fluid connection of the first intermediate manifold 72 to the second intermediate manifold 74. The mounting tab 198 has screw holes 201 through which the primary heat exchanger 50 can be conveniently mounted to the system architecture. The primary heat exchanger 50 and secondary heat exchanger 52 interact with the rest of the system in a similar manner to that shown in Figure 3.

[0033] To facilitate the installation of the heat exchanger assembly in the system architecture, it may be advantageous to configure the primary heat exchanger 50 and secondary heat exchanger 52 of the thermal insulation heat exchanger assembly 22 in other configurations. For example, the primary heat exchanger 50 shown in Figures 3 to 7 may be positioned upside down so that the heat exchanger inlet and outlet, as well as the finless bend, are located at the bottom. In such embodiments, the secondary heat exchanger 52 is also moved to the bottom side in a closed shape.

[0034] The primary heat exchanger 50 and secondary heat exchanger 52 of the heat-insulating heat exchanger assembly 22 and the heat-absorbing heat exchanger assembly 24 may be mini-channel flat-tube louver-fin heat exchangers, circular-tube plate-fin heat exchangers, or any other type of heat exchanger to facilitate heat exchange between the primary and secondary fluids.

[0035] Referring to Figures 1 and 2, the heat absorption heat exchanger assembly 24 includes a heat absorption heat exchanger assembly inlet 110 and a heat absorption heat exchanger assembly outlet 112.

[0036] The heat absorption heat exchanger assembly inlet 110 is fluidly connected to the primary heat exchanger outlet 82 of the primary heat exchanger 50 through a first expansion device 160, a flash tank economizer 162, and a second expansion device 164, as shown in Figure 1. The flash tank economizer 162 may include a first compression stage inlet 170, a first compression stage outlet 172, and a second compression stage outlet 174. The first compression stage inlet 170 is configured to receive refrigerant from the primary heat exchanger outlet 82 through the first expansion device 160. The first compression stage outlet 172 of the flash tank economizer 162 is configured to supply refrigerant in vapor form to the second compression stage inlet 42 of the second compressor stage 40 of the compressor assembly 20. The outlet 174 of the second compression stage is configured to supply the refrigerant in liquid form to the second expansion unit 164, which in turn supplies the refrigerant to the heat absorption heat exchanger assembly inlet 110.

[0037] As an alternative design, the heat absorption heat exchanger assembly inlet 110 is fluidly connected to the primary heat exchanger outlet 82 of the primary heat exchanger 50 through a first heat exchanger economizer 182 and a second expansion device 184, as shown in Figure 2. The heat exchanger economizer 182 may include a first inlet 190, a second inlet 192, a first outlet 196, and a second outlet 194. The refrigerant coming from the primary heat exchanger outlet 82 of the primary heat exchanger 50 is divided into two flows. One flow enters the first inlet 190, and the other flow enters the inlet 192 through the first expansion device 180. The two flows exchange heat in the heat exchanger economizer 182. The refrigerant flow entering the first inlet 190 is cooled and then connected to the secondary heat exchanger assembly inlet 110 of the heat absorption heat exchanger assembly 24 through the two expansion devices 184. The flow of refrigerant entering the inlet 192 of the second compression stage is heated and then combined with the refrigerant coming from the secondary heat exchanger outlet 102 of the secondary heat exchanger 52 of the thermal insulation heat exchanger assembly 22, which is connected to the inlet 42 of the second compression stage of the second compressor stage 40 of the compressor assembly 20.

[0038] The outlet 112 of the heat absorption heat exchanger assembly is fluidly connected to the inlet 32 ​​of the first compression stage of the first compressor stage 30 of the compressor assembly 20.

[0039] The heat absorption fan 200 includes a heat absorption heat exchanger assembly 24. The heat absorption fan 200 is configured to draw a second fluid through the heat absorption heat exchanger assembly 24 in order to heat the refrigerant passing through the heat absorption heat exchanger assembly 24.

[0040] The heat-insulating heat exchanger assembly 22, which utilizes a secondary heat exchanger 52, is at least partially located within the primary heat exchanger 50 to form a closed shape that provides a compact, lightweight, and lower-cost heat exchanger with high heat transfer efficiency, as well as an adaptable architecture for easy integration with a variety of refrigeration systems. The compactness of the heat-insulating heat exchanger assembly 22 is achieved by configuring the primary and secondary heat exchangers in a closed shape that shares a common heat-insulating fan with different radii. This means that different heat exchanger sizes can be oriented at any angle, which is advantageous over conventional flat heat exchangers that typically occupy a much larger space.

[0041] The heat exchangers of this disclosure may use aluminum or aluminum alloys, which have superior ductility and formability compared to conventional copper heat exchangers. Furthermore, all-aluminum heat exchangers are generally lighter and less expensive than copper tube heat exchangers.

[0042] The primary heat exchanger 50 and secondary heat exchanger 52 of the thermal insulation heat exchanger assembly 22 may be configured with a cross-counterflow relative to the flow of the secondary fluid. The cross-counterflow configuration provides excellent heat transfer efficiency.

[0043] While exemplary embodiments include only single-row or double-row heat exchangers, any combination of multi-row heat exchangers or different rows or different bend configurations of the primary heat exchanger 50 and secondary heat exchanger 52 may also fall within the scope of this disclosure.

[0044] The term "approximately" is intended to include the degree of error associated with the measurement of a particular quantity based on the equipment available at the time of filing.

[0045] The technical terms used herein are for the sole purpose of describing specific embodiments and are not intended to limit the disclosure. As used herein, the singular forms “a,” “an,” and “the” are intended to include the plural form unless the context otherwise explicitly indicates. It will be further understood that the terms “comprise” and / or “comprising,” when used herein, specify the presence of a described feature, integer, step, operation, element, and / or component, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0046] While this disclosure describes one or more exemplary embodiments, it will be understood by those skilled in the art that a variety of modifications can be made without departing from the scope of this disclosure, and that equivalents can be substituted for their elements. Furthermore, many modifications can be made to adapt the teachings of this disclosure to specific circumstances or materials without departing from the essential scope of this disclosure. Thus, this disclosure is not limited to any particular embodiment disclosed as the best mode intended for carrying out this disclosure, but is intended to include all embodiments that fall within the claims.

Claims

1. A compact heat exchanger assembly for a refrigeration system, equipped with a heat-insulating heat exchanger assembly, The aforementioned heat-insulating heat exchanger assembly is A primary heat exchanger, The first tube bank extends from the first manifold, The second tube bank extends from the second manifold, At least one bend configured to fluidly connect the first tube bank to the second tube bank, Bends provided in the first tube bank and the second tube bank are arranged such that at least a portion of the first tube bank is positioned parallel to the second tube bank. The primary heat exchanger comprises, A secondary heat exchanger is positioned between the second manifold and the at least one bend, Equipped with, The primary heat exchanger and the secondary heat exchanger are configured in a closed shape. The sealing member connects the secondary heat exchanger to the second manifold and the at least one bend, thereby blocking the gap between the primary heat exchanger and the secondary heat exchanger. A compact heat exchanger assembly for a refrigeration system, wherein the primary heat exchanger has a U-shape, and the secondary heat exchanger extends across the width of the U-shape to define the closed shape.

2. A compact heat exchanger assembly for a refrigeration system according to claim 1, wherein at least one of the bends is a finless bend.

3. The compact heat exchanger assembly for a refrigeration system according to claim 1, wherein the bend is a finned bend.

4. A compact heat exchanger assembly for a refrigeration system according to claim 1, further comprising fins interposed between adjacent tubes of the first tube bank and the second tube bank.

5. The aforementioned secondary heat exchanger, Tube bank section extending between the third and fourth manifolds A compact heat exchanger assembly for a refrigeration system according to claim 1, comprising:

6. The compact heat exchanger assembly for a refrigeration system according to claim 1, wherein the secondary heat exchanger of the heat-insulating heat exchanger assembly is configured as a single-row heat exchanger.

7. A compact heat exchanger assembly for a refrigeration system, equipped with a heat-insulating heat exchanger assembly, The aforementioned heat-insulating heat exchanger assembly comprises a primary heat exchanger and a secondary heat exchanger. The primary heat exchanger is, The first tube bank extends from the first manifold, The second tube bank extends from the second manifold, At least one bend configured to fluidly connect the first tube bank to the second tube bank, Equipped with, The first tube bank and the second tube bank are provided with bends such that the primary heat exchanger generally has a curved shape. The aforementioned secondary heat exchanger is It is positioned between the at least one bend and the second manifold, The primary heat exchanger and the secondary heat exchanger are configured in a closed shape. The sealing member connects the secondary heat exchanger to the second manifold and the at least one bend, thereby blocking the gap between the primary heat exchanger and the secondary heat exchanger. A compact heat exchanger assembly for a refrigeration system, wherein the primary heat exchanger has a U-shape, and the secondary heat exchanger extends across the width of the U-shape to define the closed shape.

8. The compact heat exchanger assembly for a refrigeration system according to claim 7, wherein the bend is a finned bend.

9. The aforementioned secondary heat exchanger, Tube bank section extending between the third and fourth manifolds A compact heat exchanger assembly for a refrigeration system according to claim 7, including the above.

10. A compact heat exchanger assembly for a refrigeration system according to claim 9, wherein the first manifold is positioned adjacent to the third manifold, and the second manifold is positioned adjacent to the fourth manifold.

11. The compact heat exchanger assembly for a refrigeration system according to claim 9, wherein the secondary heat exchanger of the heat-insulating heat exchanger assembly is configured as a single-row heat exchanger.

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