Overheating component, heat exchanger, and refrigeration system

Abstract

The present disclosure provides an overheating elimination component, a heat exchanger, and a refrigeration system. The overheating elimination component includes: a partition wall that encloses an overheating elimination chamber, and an overheating elimination chamber inlet and an overheating elimination chamber outlet that are communicated with the overheating elimination chamber are provided on the partition wall; a first heat exchange tube, at least a part of the tube section of the first heat exchange tube is located in the overheating elimination chamber to cool the gaseous working medium in the overheating elimination chamber; and a gas equalizing plate that is located in the overheating elimination chamber and is arranged between the overheating elimination chamber inlet and the overheating elimination chamber outlet, at least a part of the tube section of the first heat exchange tube is located between the gas equalizing plate and the overheating elimination chamber outlet, and the gas equalizing plate has a plurality of gas equalizing holes that are divided into two groups of gas equalizing holes with different diameters.

Description

Technical Field

[0001] The present disclosure relates to the technical field of heat exchange equipment, and particularly to a superheat removal component, a heat exchanger, and a refrigeration system. Background Art

[0002] In some refrigeration systems, for example, in the refrigeration system of a commercial water-cooled chiller, the high-temperature and high-pressure refrigerant gas discharged from the compressor is in a superheated state. Therefore, the refrigerant at the inlet of the condenser of the refrigeration system is generally also in a superheated state. The superheated refrigerant gas first undergoes single-phase sensible heat exchange (superheat removal heat exchange) in the shell of the condenser, and the refrigerant gas cools from the superheated state to the saturated state. Then, the saturated refrigerant gas undergoes latent heat exchange and is transformed into saturated liquid refrigerant. The heat transfer intensity of latent heat exchange is 10-20 times that of single-phase sensible heat exchange, and the heat transfer coefficient of latent heat exchange can reach 10 kw / (m 2 *K).

[0003] Although the heat transfer amount of superheat removal heat exchange only accounts for about 6% of the total heat transfer amount of the condenser, due to the low heat transfer intensity of single-phase sensible heat exchange, more than 18% of the heat transfer area of the condenser is required for superheat removal heat exchange, which hinders the further improvement of the energy efficiency and cost optimization of the condenser, such as the horizontal condenser used in commercial water chillers. Summary of the Invention

[0004] The purpose of the present disclosure is to provide a superheat removal component, a heat exchanger, and a refrigeration system, aiming to solve the problem of low heat transfer intensity of single-phase sensible heat exchange in the heat exchanger.

[0005] The first aspect of the present disclosure provides a superheat removal component of a heat exchanger, including:

[0006] A partition wall that encloses a superheat removal chamber, and a superheat removal chamber inlet and a superheat removal chamber outlet communicating with the superheat removal chamber are provided on the partition wall;

[0007] A first heat exchange tube, at least a part of the tube section of which is located in the superheat removal chamber to cool the gaseous working medium entering the superheat removal chamber; and

[0008] An air distribution plate, which is located in the superheat removal chamber and is arranged between the superheat removal chamber inlet and the superheat removal chamber outlet, and at least a part of the tube section of the first heat exchange tube is located between the air distribution plate and the superheat removal chamber outlet. The air distribution plate has a plurality of air distribution holes divided into two groups of air distribution holes with different diameters; wherein, the pressure drop ΔP of the gaseous working medium flowing through the superheat removal component is:

[0009] ΔP = Cρv 2 ;

[0010]

[0011] ρ is the density of the gaseous working medium at the inlet of the gaseous working medium, with the unit of kg / m 3 ;

[0012] v is the flow velocity of the gaseous working medium at the inlet of the gaseous working medium, with the unit of m / s;

[0013] is the diameter of the inlet of the superheat removal chamber, with the unit of m;

[0014] and are the diameters of two groups of uniform air holes with different diameters, with the unit of m;

[0015] n 1 is the number of uniform air holes in the group of uniform air holes with a uniform air hole diameter of ;

[0016] n 2 is the number of uniform air holes in the group of uniform air holes with a uniform air hole diameter of ;

[0017] In the superheat removal component of some embodiments, the uniform air plate includes a uniform air plate body facing the inlet of the superheat removal chamber. The uniform air plate body includes a baffle area opposite to the air inlet direction and an orifice plate area connected to the baffle area. The plurality of uniform air holes are located on the orifice plate area.

[0018] In the superheat removal component of some embodiments, among the plurality of uniform air holes, the two groups of uniform air holes with different diameters are arranged along the direction from the baffle area to the orifice plate area, wherein the diameter of the uniform air holes in the group of uniform air holes close to the baffle area is smaller than the diameter of the uniform air holes in the group of uniform air holes far from the baffle area

[0019] In the superheat removal component of some embodiments, the diameter of the uniform air holes in the group of uniform air holes close to the baffle area and the diameter of the uniform air holes in the group of uniform air holes far from the baffle area satisfy

[0020] In the superheat removal component of some embodiments, the uniform air plate further includes a surrounding plate. The surrounding plate is located at the edge of the uniform air plate body and has an included angle with the uniform air plate body. The surrounding plate is connected to the partition wall.

[0021] In the superheat removal component of some embodiments, the inlet of the superheat removal chamber and the outlet of the superheat removal chamber are located on opposite sides of the partition wall. The inlet of the superheat removal chamber is located in the middle of the side where it is located, and the outlet of the superheat removal chamber is located at the end of the side where it is located.

[0022] In the superheat removal component of some embodiments, the partition wall has two superheat removal chamber outlets that are symmetric with respect to the superheat removal chamber inlet.

[0023] In the superheat removal component of some embodiments, the diameter of the superheat removal chamber inlet and the diameters of the two superheat removal chamber outlets satisfy

[0024] In the superheat removal component of some embodiments, the partition wall is a box body, including a first wall, a second wall spaced from the first wall, two third walls respectively located on both sides of the first wall and the second wall and connecting the first wall and the second wall, and two fourth walls respectively connected to the two ends of the first wall, the second wall and the third wall. The superheat removal chamber inlet is arranged on the first wall, and the superheat removal chamber outlet is arranged on the second wall.

[0025] In the superheat removal component of some embodiments, the middle part of the first heat exchange tube is located in the superheat removal chamber, both ends of the first heat exchange tube are located outside the partition wall, and the fourth wall is provided with a tube hole for the first heat exchange tube to pass through.

[0026] In the superheat removal component of some embodiments, the superheat removal component includes a gas baffle plate, and the gas baffle plate is located between the superheat removal chamber inlet and the gas equalizing plate.

[0027] In the superheat removal component of some embodiments, the two sets of gas equalizing holes with different diameters on the gas equalizing plate are symmetrically arranged with respect to the superheat removal chamber inlet.

[0028] In the superheat removal component of some embodiments,

[0029] wherein,

[0030] α is the product of the logarithmic mean temperature difference and the heat transfer area, and the value range of α is 10 to 100, with the unit of m 2 *K;

[0031] m is the number of the first heat exchange tubes;

[0032] D is the outer diameter of the first heat exchange tube, with the unit of m;

[0033] L is the length of the tube section of the first heat exchange tube located in the superheat removal chamber, with the unit of m;

[0034] T in is the temperature of the gaseous working medium entering the superheat removal chamber, with the unit of K;

[0035] T outis the temperature of the gaseous working medium flowing out of the superheat removal chamber, in K;

[0036] T wall is the average outer surface temperature of the tube section of the first heat exchange tube located in the superheat removal chamber, in K.

[0037] A second aspect of the present disclosure provides a heat exchanger, including:

[0038] a housing having a gaseous working medium inlet and a liquid working medium outlet;

[0039] the superheat removal assembly described in the first aspect of the present disclosure, the partition wall of the superheat removal assembly divides the internal space of the housing into the superheat removal chamber and the condensation chamber, the gaseous working medium inlet is communicated with the superheat removal chamber inlet, and the condensation chamber is communicated with the superheat removal chamber outlet and the liquid working medium outlet; and

[0040] a second heat exchange tube located in the condensation chamber and configured to condense the gaseous working medium entering the condensation chamber from the superheat removal chamber into a liquid working medium.

[0041] In the heat exchanger of some embodiments, a support plate assembly is further included, the support plate assembly includes a support plate, the partition wall is connected to the support plate, and the support plate is connected to the inner wall of the housing.

[0042] In the heat exchanger of some embodiments, the support plate assembly further includes a support rod, and the support rod connects the support plate and a tube sheet for supporting the second heat exchange tube.

[0043] In the heat exchanger of some embodiments, the housing is cylindrical, the partition wall is a box body having the superheat removal chamber and extends along the axial direction of the housing, and the first heat exchange tube and the second heat exchange tube extend along the axial direction of the housing.

[0044] In the heat exchanger of some embodiments, the box body is symmetrically arranged with respect to the plane passing through the center line of the gaseous working medium inlet and the axis of the housing, wherein,

[0045] the ratio of the distance in the radial direction of the housing of the cross section of the box body in the plane to the inner diameter of the housing is 0.1 to 0.35; and / or

[0046] the ratio of the length of the box body to the length of the housing is 0.4 to 1.

[0047] In the heat exchanger of some embodiments, there are gaps between the axial two ends of the partition wall and the axial two ends of the housing respectively, the middle part of the first heat exchange tube is located in the superheat removal chamber, and the two ends of the first heat exchange tube are located in the condensation chamber.

[0048] In the heat exchanger of some embodiments, the ratio of the number of the first heat exchange tubes to the sum of the numbers of the first heat exchange tubes and the second heat exchange tubes is 3 to 20%.

[0049] The third aspect of the present disclosure provides a refrigeration system, including a condenser, and the condenser is the heat exchanger described in the second aspect of the present disclosure.

[0050] Based on the superheat removal component, the heat exchanger and the refrigeration system provided by the present disclosure, since the gaseous working medium enters the superheat removal cavity before entering the condensation cavity and is cooled by at least a part of the tube segments of the first heat exchange tubes in the superheat removal cavity, it is beneficial to enable the gaseous working medium to fully exchange heat with the tube segments of the first heat exchange tubes in the superheat removal cavity, which is beneficial to better organize the air flow in the superheat removal cavity, thereby being beneficial to improving the heat transfer coefficient of the superheat removal heat transfer, and thus improving the overall heat transfer efficiency of the heat exchanger. By reasonably controlling the opening parameters on the air distribution plate to change the value of C, the purpose of controlling the pressure drop of the heat exchanger is achieved, and the pressure drop of the heat exchanger of this patent is controlled within a reasonable range. The pressure drop ΔP is proportional to C, and decreases with the increase of and increases with the increase of and Thus, by reasonably designing the diameter of the inlet 501A of the superheat removal cavity to be and the diameters of the air distribution holes in each group, the pressure drop ΔP of the gaseous working medium flowing through the superheat removal component 5 can be controlled within a reasonable range.

[0051] Through the following detailed description of the exemplary embodiments of the present disclosure with reference to the drawings, other features and advantages of the present disclosure will become clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The drawings described herein are used to provide a further understanding of the present disclosure, and constitute a part of this application. The schematic embodiments of the present disclosure and their descriptions are used to explain the present disclosure, and do not constitute an improper limitation to the present disclosure. In the drawings:

[0053] Figure 1 is a schematic structural diagram of the heat exchanger according to the embodiment of the present disclosure.

[0054] Figure 2 is Figure 1 a schematic structural diagram of the superheat removal component of the heat exchanger shown, in which the top plate of the partition wall is not shown.

[0055] Figure 3 is Figure 2 a front view structural diagram with a partial section of the superheat removal component shown.

[0056] Figure 4 is Figure 3 a sectional structural diagram of the superheat removal component shown.

[0057] Figure 5 isFigure 2 Schematic cross-sectional structure diagram of the partition wall of the superheat removal component in one direction as shown.

[0058] Figure 6 is Figure 5 Schematic cross-sectional structure diagram of the partition wall in the other direction as shown.

[0059] Figure 7 is Figure 2 Schematic structure diagram of the gas distribution plate of the superheat removal component of the heat exchanger in one direction as shown.

[0060] Figure 8 is Figure 7 Schematic structure diagram of the gas distribution plate in the other direction as shown.

[0061] Figure 9 is Figure 1 Schematic connection structure diagram of the superheat removal component and the support plate component of the heat exchanger as shown.

[0062] Figures 1 to 9 In the figure, each reference numeral represents respectively:

[0063] 1. Left water chamber;

[0064] 2. Left side tube sheet;

[0065] 3. Shell, 3A. Gaseous working medium inlet, 3B. Liquid working medium outlet, 3C. Condensation chamber;

[0066] 4. Second heat exchange tube;

[0067] 5. Superheat removal component, 501. Partition wall, 5011. First wall, 5012. Second wall, 5013. Third wall, 5014. Fourth wall, 501A. Superheat removal chamber inlet, 501B. Superheat removal chamber outlet, 501C. Superheat removal chamber; 502. Gas distribution plate, 5021. Gas distribution plate main body, 50211. Baffle area, 50212. Orifice plate area, 5022. Enclosure plate, 503. First heat exchange tube, 504. Gas baffle;

[0068] 6. Support plate component, 601. Support plate, 602. Support rod;

[0069] 7. Right side tube sheet;

[0070] 8. Right flange;

[0071] 9. Right water chamber;

[0072] 10. Right water chamber gasket;

[0073] 11. Liquid collection package;

[0074] 12. Left water chamber gasket;

[0075] 13. Left flange

[0076] 14. Drain chamber connection pipe

[0077] 15. Feed chamber connection pipe

[0078] 16. Intake pipe Detailed implementation manners

[0079] The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part rather than all of the embodiments of the present disclosure. The description of at least one exemplary embodiment is actually illustrative only and in no way limits the present disclosure, its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the scope of protection of the present disclosure.

[0080] Unless otherwise specifically stated, the relative arrangements, numerical expressions and values of the components and steps set forth in these embodiments do not limit the scope of the present disclosure. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationship. Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0081] In the description of the present disclosure, it should be understood that the use of terms such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. Without further statement, the above terms have no special meaning and thus cannot be construed as limiting the scope of protection of the present disclosure.

[0082] In the description of the present disclosure, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present disclosure and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present disclosure; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0083] As Figures 1 to 9 shown, an overheating removal component of a heat exchanger provided by an embodiment of the present disclosure includes a partition wall 501, a first heat exchange tube 503 and a gas distribution plate 502. The partition wall 501 encloses an overheating removal cavity 501C. An overheating removal cavity inlet 501A and an overheating removal cavity outlet 501B communicating with the overheating removal cavity 501C are provided on the partition wall 501. At least part of the tube section of the first heat exchange tube 503 is located in the overheating removal cavity 501C to cool the gaseous working medium entering the overheating removal cavity 501C. The gas distribution plate 502 is located in the overheating removal cavity 501C and is arranged between the overheating removal cavity inlet 501A and the overheating removal cavity outlet 501B. At least part of the tube section of the first heat exchange tube 503 is located between the gas distribution plate 502 and the overheating removal cavity outlet 501B. The gas distribution plate 502 has a plurality of gas distribution holes divided into two groups of gas distribution holes with different diameters.

[0084] Among them, the pressure drop ΔP of the gaseous working medium flowing through the overheating removal component 5 is:

[0085] ΔP = Cρv 2 ;

[0086]

[0087] ρ is the density of the gaseous working medium at the gaseous working medium inlet 3A, with the unit of kg / m 3 ;

[0088] v is the flow velocity of the gaseous working medium at the gaseous working medium inlet 3A, with the unit of m / s;

[0089] is the diameter of the overheating removal cavity inlet 501A, with the unit of m;

[0090] and are the diameters of two groups of gas distribution holes with different diameters, with the unit of m;

[0091] n 1 is the number of gas distribution holes in the group of gas distribution holes with the gas distribution hole diameter of ;

[0092] n 2is the number of uniform air holes of the uniform air hole group with a uniform air hole diameter of .

[0093] Based on the de-superheating component provided by the present disclosure, since the gaseous working medium enters the de-superheating cavity before entering the condensation cavity and is cooled by at least a part of the tube section of the first heat exchange tube in the de-superheating cavity, it is beneficial to enable the gaseous working medium to fully exchange heat with the tube section of the first heat exchange tube in the de-superheating cavity, which is beneficial to better organize the air flow in the de-superheating cavity, thereby facilitating the improvement of the heat transfer coefficient of the de-superheating heat exchange, and thus improving the overall heat transfer efficiency of the heat exchanger. By reasonably controlling the opening parameters on the air distribution plate to change the value of C, the purpose of controlling the pressure drop of the heat exchanger is achieved, so that the pressure drop of the heat exchanger of this patent is controlled within a reasonable range. The pressure drop ΔP is proportional to C, and decreases with the increase of , and increases with the increase of and . Thus, by reasonably designing the diameter of the de-superheating cavity inlet 501A to be and the diameter of each group of uniform air holes, the pressure drop ΔP of the gaseous working medium flowing through the de-superheating component 5 can be controlled within a reasonable range.

[0094] In the de-superheating component of some embodiments, the air distribution plate 502 includes an air distribution plate main body 5021 facing the de-superheating cavity inlet 501A. The air distribution plate main body 5021 includes a baffle area 50211 opposite to the air inlet direction and an orifice plate area 50212 connected to the baffle area 50211. A plurality of uniform air holes are located on the orifice plate area 50212.

[0095] In the de-superheating component of some embodiments, among the plurality of uniform air holes, two groups of uniform air holes with different diameters are arranged along the direction from the baffle area 50211 to the orifice plate area 50212. The diameter of the uniform air holes of the uniform air hole group close to the baffle area 50211 is smaller than the diameter of the uniform air holes of the uniform air hole group far from the baffle area 50211

[0096] In the de-superheating component of some embodiments, the diameter of the uniform air hole 502A of the uniform air hole group close to the baffle area 50211 and the diameter of the uniform air hole 502B of the uniform air hole group far from the baffle area 50211 satisfy

[0097] In the de-superheating component of some embodiments, the air distribution plate 502 further includes a surrounding plate 5022. The surrounding plate 5022 is located at the edge of the air distribution plate main body 5021 and has an included angle with the air distribution plate main body 5021. The surrounding plate 5022 is connected to the partition wall 501.

[0098] In the superheat removal component of some embodiments, the superheat removal chamber inlet 501A and the superheat removal chamber outlet 501B are located on opposite sides of the partition wall 501. The superheat removal chamber inlet 501A is located in the middle of the side where it is located, and the superheat removal chamber outlet 501B is located at the end of the side where it is located.

[0099] In the superheat removal component of some embodiments, the partition wall 501 has two superheat removal chamber outlets 501B that are symmetric with respect to the superheat removal chamber inlet 501A.

[0100] In the superheat removal component of some embodiments, the diameter of the superheat removal chamber inlet 501A and the diameters of the two superheat removal chamber outlets 501B satisfy

[0101] In the superheat removal component of some embodiments, the partition wall 501 is a box body, including a first wall 5011, a second wall 5012 spaced apart from the first wall 5011, two third walls 5013 respectively located on both sides of the first wall 5011 and the second wall 5012 and connecting the first wall 5011 and the second wall 5012, and two fourth walls 5014 respectively connecting the two ends of the first wall 5011, the second wall 5012 and the third wall 5013. The superheat removal chamber inlet 501A is provided on the first wall 5011, and the superheat removal chamber outlet 501B is provided on the second wall 5012.

[0102] In the superheat removal component of some embodiments, the middle part of the first heat exchange tube 503 is located in the superheat removal chamber 501C, and both ends of the first heat exchange tube 503 are located outside the partition wall 501. The fourth wall 5014 is provided with a tube hole for the first heat exchange tube 503 to pass through.

[0103] In the superheat removal component of some embodiments, the superheat removal component 5 includes a gas baffle 504, and the gas baffle 504 is located between the superheat removal chamber inlet 501A and the gas equalizing plate 502.

[0104] In the superheat removal component of some embodiments, the two groups of gas equalizing holes with different diameters on the gas equalizing plate 502 are symmetrically arranged with respect to the superheat removal chamber inlet 501A.

[0105] In the superheat removal component of some embodiments,

[0106] wherein,

[0107] α is the product of the logarithmic mean temperature difference and the heat transfer area. The value range of α is 10 to 100, and the unit is m 2 *K;

[0108] m is the number of the first heat exchange tubes 503;

[0109] D is the outer diameter of the first heat exchange tube 503, with the unit of m;

[0110] L is the length of the tube section of the first heat exchange tube 503 located in the de-superheating chamber 501C, with the unit of m;

[0111] T in is the temperature of the gaseous working medium entering the de-superheating chamber 501C, with the unit of K;

[0112] T out is the temperature of the gaseous working medium flowing out of the de-superheating chamber 501C, with the unit of K;

[0113] T wall is the average outer surface temperature of the tube section of the first heat exchange tube 503 located in the de-superheating chamber 501C, with the unit of K.

[0114] The embodiment of the present disclosure further provides a heat exchanger, including a shell 3, the de-superheating assembly 5 of the embodiment of the present disclosure, and a second heat exchange tube 4. The shell 3 has a gaseous working medium inlet 3A and a liquid working medium outlet 3B. The partition wall 501 of the de-superheating assembly 5 divides the internal space of the shell 3 into a de-superheating chamber 501C and a condensation chamber 3C. The gaseous working medium inlet 3A is communicated with the de-superheating chamber inlet 501A, and the condensation chamber 3C is communicated with the de-superheating chamber outlet 501B and the liquid working medium outlet 3B. The second heat exchange tube 4 is located in the condensation chamber 3C and is configured to condense the gaseous working medium entering the condensation chamber 3C from the de-superheating chamber 501C into a liquid working medium.

[0115] In the heat exchanger of some embodiments, it further includes a support plate assembly 6. The support plate assembly includes a support plate 601. The partition wall 501 is connected to the support plate 601, and the support plate 601 is connected to the inner wall of the shell 3.

[0116] In the heat exchanger of some embodiments, the support plate assembly 6 further includes a support rod 602. The support rod 602 connects the support plate 601 and the tube sheet 7 for supporting the second heat exchange tube 4.

[0117] In the heat exchanger of some embodiments, the shell 3 is cylindrical. The partition wall 501 is a box body with a de-superheating chamber 501C and extends along the axial direction of the shell 3. The first heat exchange tube 503 and the second heat exchange tube 4 extend along the axial direction of the shell 3.

[0118] In the heat exchanger of some embodiments, the box body is symmetrically arranged with respect to the plane passing through the center line of the gaseous working medium inlet 3A and the axis of the shell 3. Wherein, the ratio of the distance in the radial direction of the shell 3 of the cross-section of the box body in the plane to the inner diameter of the shell 3 is 0.1 - 0.35; and / or the ratio of the length of the box body to the length of the shell 3 is 0.4 - 1.

[0119] In the heat exchanger according to some embodiments, there are gaps between the axial two ends of the partition wall 501 and the axial two ends of the housing 3 respectively. The middle part of the first heat exchange tube 503 is located in the superheat removal chamber 501C, and the two ends of the first heat exchange tube 503 are located in the condensation chamber 3C.

[0120] In the heat exchanger according to some embodiments, the ratio of the number of the first heat exchange tubes 503 to the sum of the numbers of the first heat exchange tubes 503 and the second heat exchange tubes 4 is 3 to 20%.

[0121] The embodiment of the present disclosure further provides a refrigeration system, including a condenser, and the condenser is the heat exchanger according to the embodiment of the present disclosure.

[0122] The heat exchanger and the refrigeration system according to the embodiment of the present disclosure have the advantages of the superheat removal assembly according to the embodiment of the present disclosure.

[0123] The following Figures 1 to 9 illustrates the heat exchanger according to the embodiment of the present disclosure and its superheat removal assembly 5.

[0124] As Figure 1 shown, the heat exchanger according to the embodiment of the present disclosure is a horizontal condenser and is used as the condenser of the refrigeration system. In this embodiment, the gaseous working medium is the refrigerant gas, and the liquid working medium is the liquid refrigerant.

[0125] The heat exchanger includes a housing 3, a superheat removal assembly 5, and a second heat exchange tube 4.

[0126] The housing 3 has a gaseous working medium inlet 3A and a liquid working medium outlet 3B.

[0127] The superheat removal assembly 5 is located in the housing 3 and includes a partition wall 501 and a first heat exchange tube 503. The partition wall 501 divides the internal space of the housing 3 into a superheat removal chamber 501C and a condensation chamber 3C. The gaseous working medium inlet 3A is communicated with the superheat removal chamber 501C, the liquid working medium outlet 3B is communicated with the condensation chamber 3C, and a superheat removal chamber outlet 501B communicating the superheat removal chamber 501C with the condensation chamber 3C is provided on the partition wall 501. The first heat exchange tube 503 is configured to cool the gaseous working medium entering the internal space through the gaseous working medium inlet 3A. At least part of the tube section of the first heat exchange tube 503 is located in the superheat removal chamber 501C to cool the gaseous working medium in the superheat removal chamber 501C.

[0128] The second heat exchange tube 4 is located in the condensation chamber 3C and is configured to condense the gaseous working medium entering the condensation chamber 3C from the superheat removal chamber 501C into a liquid working medium.

[0129] Before the gaseous working medium enters the condensation chamber 3C, it first enters the superheat removal chamber 501C and is cooled by at least a part of the pipe section of the first heat exchange pipe 503 in the superheat removal chamber 501C, which is conducive to the full heat exchange between the gaseous working medium and the pipe section of the first heat exchange pipe 503 in the superheat removal chamber 501C, conducive to better organizing the air flow in the superheat removal chamber 501C, thereby conducive to improving the heat transfer coefficient of superheat removal heat transfer, and thus improving the overall heat transfer efficiency of the heat exchanger.

[0130] As Figure 1 shown, the horizontal condenser includes a left water chamber 1, a left side tube sheet 2, a shell 3, heat exchange pipes 4, a superheat removal assembly 5, a support plate assembly 6, a right side tube sheet 7, a right flange 8, a right water chamber 9, a right water chamber gasket 10, a liquid collection package 11, a left water chamber gasket 12, a left flange 13, a lower water chamber connecting pipe 14, an upper water chamber connecting pipe 15, and an air inlet pipe 16. The air inlet pipe 16 is connected to the gaseous working medium inlet 3A, and the liquid collection package 11 is connected to the liquid working medium outlet 3B.

[0131] The left water chamber assembly composed of the left water chamber 1, the left water chamber gasket 12, the left flange 13, the lower water chamber connecting pipe 14, and the upper water chamber connecting pipe 15 is located on the left side of the shell 3 and is sequentially connected to the left end of the shell 3 through the left side tube sheet 2, the left water chamber gasket 12, and the left flange 13, while the right water chamber 9 is sequentially connected to the right end of the shell 3 through the right side tube sheet 7, the right water chamber gasket 10, the right flange 8. The superheat removal assembly 5 is positioned on the shell 3 by the support plate assembly 6 located in the middle. The first heat exchange pipe 503 and the second heat exchange pipe 4 pass through the inside of the shell 3 and communicate with the left water chamber 1 and the right water chamber 9.

[0132] As Figures 1 to 6 、 Figure 9 shown, the superheat removal chamber 501C is surrounded by a partition wall 501. In an embodiment not shown, the superheat removal chamber 501C is jointly surrounded by the partition wall 501 and the shell 3.

[0133] As Figures 1 to 6 、 Figure 9 shown, the partition wall 501 is a box body with a superheat removal chamber 501C and has a superheat removal chamber inlet 501A. The heat exchanger includes an air inlet pipe 16, and the air inlet pipe 16 passes through the gaseous working medium inlet 3A and is connected to the superheat removal chamber inlet 501A.

[0134] As Figures 1 to 6 、 Figure 9As shown, the dividing wall 501 includes a first wall 5011, a second wall 5012 spaced apart from the first wall 5011, two third walls 5013 respectively located on both sides of the first wall 5011 and the second wall 5012 and connecting the first wall 5011 and the second wall 5012, and two fourth walls 5014 respectively connected to the two ends of the first wall 5011, the second wall 5012 and the third walls 5013. The middle part of the first heat exchange tube 503 is located in the superheat removal chamber 501C, and both ends of the first heat exchange tube 503 are located in the condensation chamber 3C. Tube holes for the first heat exchange tube 503 to pass through are provided on the fourth walls 5014. The superheat removal chamber inlet 501A is arranged on the first wall 5011, and the superheat removal chamber outlet 501B is arranged on the second wall 5012.

[0135] As Figures 1 to 6 , Figure 9 shown, the superheat removal chamber inlet 501A is located in the middle of the side of the box body opposite to the gaseous working medium inlet 3A, and the superheat removal chamber outlet 501B is located at the end of the side of the box body away from the gaseous working medium inlet 3A.

[0136] As Figures 1 to 9 shown, the dividing wall 501 has two superheat removal chamber outlets 501B symmetrical with respect to the superheat removal chamber inlet 501A.

[0137] As Figure 5 shown, the diameter of the superheat removal chamber inlet 501A and the diameters

[0138] of the two superheat removal chamber outlets 501B Figure 9 satisfy

[0139] As Figure 9 shown, the heat exchanger further includes a support plate assembly 6. The support plate assembly 6 includes a support plate 601. The dividing wall 501 is connected to the support plate 601, and the support plate 601 is connected to the inner wall of the housing 3.

[0140] The superheat removal assembly 5 and the support plate assembly 6 can be connected as a whole before being assembled with the housing 3 for overall installation and positioning.

[0141] As Figures 1 to 3 , Figure 9As shown, the housing 3 of the heat exchanger is cylindrical. The partition wall 501 is a box body having a superheat removal chamber 501C and extends along the axial direction of the housing 3. The first heat exchange tube 503 and the second heat exchange tube 4 extend along the axial direction of the housing.

[0142] The box body is symmetrically arranged with respect to the plane passing through the center line of the gaseous working medium inlet 3A and the axis of the housing 3. Among them, the ratio of the distance in the radial direction of the housing 3 of the cross-section of the box body in the plane to the inner diameter of the housing 3 is 0.1 to 0.35, for example, 0.2; and / or the ratio of the length of the box body to the length of the housing 3 is 0.4 to 1, for example, 0.6, 0.8, etc.

[0143] Reasonably setting the relative dimensions of the box body and the housing 3 is beneficial to the reasonable division of the heat exchange space between superheat removal heat exchange and condensation heat exchange, is beneficial to fully realizing the superheat removal of the gaseous working medium by the first heat exchange tube 503, and is beneficial to preventing the gaseous refrigerant from being overly cooled in the superheat removal chamber 3C to form a liquid working medium.

[0144] There are intervals between the axial two ends of the partition wall 501 and the axial two ends of the housing 3 respectively. The middle part of the first heat exchange tube 503 is located in the superheat removal chamber 501C, and the two ends of the first heat exchange tube 503 are located in the condensation chamber 3C.

[0145] The ratio of the number of the first heat exchange tubes 503 to the sum of the numbers of the first heat exchange tubes 503 and the second heat exchange tubes 4 is 3 to 20%. Reasonably setting this ratio is beneficial to fully realizing the superheat removal of the gaseous working medium by the first heat exchange tube 503 and is beneficial to preventing the gaseous refrigerant from being overly cooled in the superheat removal chamber 3C to form a liquid working medium.

[0146] After the heat exchanger is positioned and installed, the axis of the housing 3 is horizontal.

[0147] As Figures 1 to 4 , Figures 6 to 9 shown, the superheat removal assembly 5 includes an air distribution plate 502 having a plurality of air holes. The air distribution plate 502 is located in the superheat removal chamber 501C and is arranged between the gaseous working medium inlet 3A and the superheat removal chamber outlet 501B. At least part of the tube section of the first heat exchange tube 503 is located between the air distribution plate 502 and the superheat removal chamber outlet 501B. The air distribution plate 502 makes the gaseous working medium flow through the tube section of the first heat exchange tube 503 in the superheat removal chamber 501C approximately perpendicular to the axial direction of the first heat exchange tube 503 and evenly. Therefore, it is beneficial to improve the heat exchange efficiency between the gaseous working medium and the tube section of the first heat exchange tube 503 in the superheat removal chamber 501C, thereby improving the overall heat exchange efficiency of the heat exchanger.

[0148] As Figures 1 to 4 , Figures 6 to 9As shown, the gas distribution plate 502 includes a gas distribution plate main body 5021 facing the intake direction of the gaseous working medium entering the superheat chamber 501C. The gas distribution plate main body 5021 includes a baffle plate area 50211 opposite to the intake direction and an orifice plate area 50212 connected to the baffle plate area 50211. The gas distribution holes are located on the orifice plate area 50212. The setting of the baffle plate area 50211 helps prevent the gaseous working medium airflow from directly hitting the first heat exchange tube 503.

[0149] As Figures 1 to 4 , Figures 6 to 9 shown, among the multiple gas distribution holes, they are divided into multiple gas distribution hole groups along the direction from the baffle plate area 50211 to the orifice plate area 50212. The diameter of the gas distribution holes in the gas distribution hole group close to the baffle plate area 50211 is smaller than the diameter of the gas distribution holes in the gas distribution hole group far from the baffle plate area 50211.

[0150] As Figures 1 to 4 , Figures 6 to 9 shown, the orifice plate area 50212 includes two gas distribution hole groups. The diameter of the gas distribution hole 502A in the gas distribution hole group close to the baffle plate area 50211 and the diameter of the gas distribution hole 502B in the gas distribution hole group far from the baffle plate area 50211 satisfy

[0151] Reasonably setting the diameter of the gas distribution holes helps the gaseous working medium to flow uniformly through the pipe section of the first heat exchange tube 503 in the superheat chamber 501C, thereby facilitating the uniform heat exchange between the gaseous working medium and each part of the pipe section of the first heat exchange tube 503 in the superheat chamber 501C, and helping to improve the overall thermal efficiency of the heat exchanger.

[0152] As Figures 1 to 9 shown in the embodiment, the partition wall 501 is a box body including the superheat chamber 501C and has a superheat chamber inlet 501A communicating with the gaseous working medium inlet 3A. The diameter of the superheat chamber inlet 501A is

[0153] The pressure drop ΔP of the gaseous working medium flowing through the superheat component 5 is:

[0154] ΔP = Cρv 2 ;

[0155]

[0156] ρ is the density of the gaseous working medium at the gaseous working medium inlet 3A, with the unit of kg / m 3 ; v is the flow velocity of the gaseous working medium at the gaseous working medium inlet 3A, with the unit of m / s; n 1 is the number of gas distribution holes in the gas distribution hole group with the gas distribution hole diameter of , n 2 is the number of gas distribution holes in the gas distribution hole group with the gas distribution hole diameter of The number of uniform air holes in the uniform air hole group.

[0157] By reasonably controlling the opening parameters on the air distribution plate to change the value of C, the purpose of controlling the pressure drop of the heat exchanger is achieved, and the pressure drop of the heat exchanger in this patent is controlled within a reasonable range. The pressure drop ΔP is proportional to C, and decreases with the increase of and increases with the increase of and Thus, by reasonably designing the diameter of the inlet 501A of the superheat removal chamber to be and the diameters of the uniform air holes in each group, the pressure drop ΔP of the gaseous working medium flowing through the superheat removal component 5 can be controlled within a reasonable range.

[0158] As shown in Figures 1 to 4 and Figures 6 to 9 , the air distribution plate 502 further includes a surrounding plate 5022. The surrounding plate 5022 is located at the edge of the air distribution plate main body 5021 and has an included angle with the air distribution plate main body 5021. The surrounding plate 5022 is connected to the outer shell 3 or the partition wall 501.

[0159] As shown in Figures 1 to 4 and Figures 6 to 9 , the superheat removal component 5 includes a gas baffle 504. The gas baffle 504 is located on the side facing the oncoming flow of the gaseous working medium in the baffle area 50211.

[0160] The gas baffle 504 can block between the air distribution plate 502 and the oncoming flow side of the gaseous working medium to prevent the air flow from directly hitting the air distribution plate 502.

[0161] In the embodiment shown in Figures 1 to 9 ,

[0162]

[0163] where α is the product of the logarithmic mean temperature difference and the heat transfer area. The value range of α is 10 to 100, and the unit is m 2 *K; m is the number of the first heat exchange tubes 503; D is the outer diameter of the first heat exchange tubes 503, and the unit is m; L is the length of the tube section of the first heat exchange tubes 503 located in the superheat removal chamber 501C, and the unit is m; T in is the temperature of the gaseous working medium entering the superheat removal chamber 501C, and the unit is K; T out is the temperature of the gaseous working medium flowing out of the superheat removal chamber 501C, and the unit is K; T wall is the average outer surface temperature of the tube section of the first heat exchange tubes 503 located in the superheat removal chamber 501C, and the unit is K.

[0164] With the increase of α, on the premise of constant total heat transfer, the superheat removal heat transfer coefficient of the heat exchanger is smaller. By controlling the parameter α, the number and size parameters of the heat exchange tubes (including the outer diameter and length) are maintained within the reasonable range of the existing heat exchange design, so that the heat exchanger can adapt to different working conditions.

[0165] In the horizontal condenser of the present disclosure embodiment, the superheat removal component 5 is located in the upper part of the internal space of the housing 3 of the heat exchanger. The cross-section of the partition wall 501 perpendicular to the housing 3 presents a trapezoid with a smaller upper part and a larger lower part. The superheated refrigerant gas enters the superheat removal cavity 501C in the box body (partition wall 501) of the superheat removal component 5 through the exhaust pipe 16, exchanges heat with the pipe section of the first heat exchange tube 503 therein to cool down to the saturated state, and then flows out from the second wall 5012 at the bottom of the box body along the two superheat removal cavity outlets 501B at both axial ends of the housing 3 and enters the condensation area 3C of the heat exchanger for phase change.

[0166] Compared with the horizontal condenser of the related art, the present disclosure embodiment adds a built-in superheat removal component 5 for strengthening single-phase sensible heat transfer. The superheated refrigerant gas enters the box body serving as the partition wall 501 of the superheat removal component 5 through the inlet pipe 16. The refrigerant gas collides with the gas baffle 504 on its lower side and is shunted to the orifice plate areas 50212 on both axial sides of the housing along the equalizing plate 502. The shunted refrigerant gas enters the superheat removal cavity 501C after passing through the plurality of equalizing holes 502A and 502B on the orifice plate area 50212, exchanges heat with the pipe section of the first heat exchange tube 503 located in the superheat removal cavity 501C in the superheat removal cavity 501C, and the heat of the refrigerant gas is taken away by the cooling medium in the first heat exchange tube 503, such as cooling water, to cool down. The cooled refrigerant gas is in a saturated state or close to the saturated state, and flows from the superheat removal cavity outlet 501B on the second wall 5012 of the box body to the condensation area 3C to exchange heat with the second heat exchange tube 4 and the pipe section of the first heat exchange tube 503 located in the condensation area 3C.

[0167] The partition wall 501, such as a box body, separates the superheat removal heat transfer process and the condensation heat transfer process of the condenser, providing a controllable space for separately strengthening the superheat removal heat transfer. Secondly, the gas baffle 504 located below the outlet of the inlet pipe 16 of the superheat removal component 5 reduces the vibration impact of the relatively high-speed airflow on the first heat exchange tube 503, improving the structural safety of the superheat removal component 5 and the heat exchanger. At the same time, the equalizing plate 502 and the equalizing holes opened thereon change the airflow direction from parallel to the first heat exchange tube 503 to perpendicular to the first heat exchange tube 503, which is beneficial to increasing the flow velocity across the tube bundle and reducing the included angle between the refrigerant airflow and the heat transfer direction of the first heat exchange tube 503, that is, strengthening the field synergy effect of single-phase sensible heat transfer and improving the superheat removal heat transfer intensity.

[0168] Therefore, this structural improvement can further enhance the energy efficiency of the corresponding horizontal condenser. At the same time, because it can significantly strengthen the superheat removal heat transfer process, the heat transfer area used for the superheat removal heat transfer process can be correspondingly reduced, that is, the number of heat exchange tubes can be reduced, so as to achieve the purpose of cost reduction and miniaturization of the heat exchanger.

[0169] The embodiment of the present disclosure also provides a refrigeration system, including a condenser. The condenser is the heat exchanger of the embodiment of the present disclosure. The refrigeration system of the embodiment of the present disclosure has the same advantages as the heat exchanger of the embodiment of the present disclosure.

[0170] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure and are not intended to limit them; although the present disclosure has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: it is still possible to modify the specific implementation manners of the present disclosure or perform equivalent replacements for some technical features, and they should all be covered by the scope of the technical solutions claimed by the present disclosure.

Claims

1. An overheating removal component of a heat exchanger, characterized in that, it includes: A partition wall (501), the partition wall (501) encloses an overheating removal chamber (501C), and an overheating removal chamber inlet (501A) and an overheating removal chamber outlet (501B) communicating with the overheating removal chamber (501C) are provided on the partition wall (501); A first heat exchange tube (503), at least a part of the tube section of the first heat exchange tube (503) is located in the overheating removal chamber (501C) to cool the gaseous working medium entering the overheating removal chamber (501C); and The gas distribution plate (502) is located in the superheat removal chamber (501C) and is disposed between the superheat removal chamber inlet (501A) and the superheat removal chamber outlet (501B). At least a portion of the first heat exchange tube (503) is located between the gas distribution plate (502) and the superheat removal chamber outlet (501B). The gas distribution plate (502) includes a gas distribution plate body (5021) facing the superheat removal chamber inlet (501A). The gas distribution plate body (5021) includes a baffle area (50211) opposite to the intake direction and an orifice plate area (50212) connected to the baffle area (50211). The plurality of gas distribution holes are located on the orifice plate area (50212). Among the plurality of gas distribution holes, the two groups of gas distribution holes with different diameters are arranged in the direction from the baffle area (50211) to the orifice plate area (50212), wherein the diameter of the gas distribution holes in the group of gas distribution holes close to the baffle area (50211) is smaller than the diameter of the gas distribution holes in the group of gas distribution holes far from the baffle area (50211) wherein, the pressure drop ΔP of the gaseous working medium flowing through the superheat removal component (5) is: ΔP = Cρv 2 ; ρ is the density of the gaseous working medium at the gaseous working medium inlet (3A), with the unit of kg / m 3 ; v is the flow rate of the gaseous working medium at the gaseous working medium inlet (3A), with the unit of m / s; is the diameter of the inlet (501A) of the said superheat removal chamber, with the unit of m; and are the diameters of two sets of uniform air holes with different diameters, in m; n 1 is the number of uniform pores of the uniform pore group with a uniform pore diameter of ; n 2 is the number of average air holes of the average air hole group with an average air hole diameter of .

2. The overheating removal component according to claim 1, characterized in that, The diameter of the uniform air holes (502A) in the uniform air hole group near the baffle area (50211) and the diameter of the uniform air holes (502B) in the uniform air hole group far from the baffle area (50211) meet 3. The overheating removal component according to claim 1, characterized in that, The air distribution plate (502) further includes a surrounding plate (5022), the surrounding plate (5022) is located at the edge of the air distribution plate main body (5021) and has an included angle with the air distribution plate main body (5021), and the surrounding plate (5022) is connected to the partition wall (501).

4. The overheating removal component according to claim 1, characterized in that, The overheating removal chamber inlet (501A) and the overheating removal chamber outlet (501B) are located on opposite sides of the partition wall (501), the overheating removal chamber inlet (501A) is located in the middle of its side, and the overheating removal chamber outlet (501B) is located at the end of its side.

5. The overheating removal component according to claim 4, characterized in that, The partition wall (501) has two overheating removal chamber outlets (501B) symmetric with respect to the overheating removal chamber inlet (501A).

6. The overheating removal component according to claim 5, characterized in that, The diameter of the inlet (501A) of the overheating chamber that has been through and the diameters of the two outlets (501B) of the overheating chamber that have been through meet 7. The overheating removal component according to any one of claims 1 to 6, characterized in that, The partition wall (501) is a box body, including a first wall (5011), a second wall (5012) spaced apart from the first wall (5011), two third walls (5013) respectively located on both sides of the first wall (5011) and the second wall (5012) and connecting the first wall (5011) and the second wall (5012), and two fourth walls (5014) respectively connected to both ends of the first wall (5011), the second wall (5012) and the third wall (5013), the overheating removal chamber inlet (501A) is provided on the first wall (5011), and the overheating removal chamber outlet (501B) is provided on the second wall (5012).

8. The overheating removal component according to claim 7, characterized in that, The middle part of the first heat exchange tube (503) is located in the overheating removal chamber (501C), both ends of the first heat exchange tube (503) are located outside the partition wall (501), and tube holes for the first heat exchange tube (503) to pass through are provided on the fourth wall (5014).

9. The overheating removal component according to any one of claims 1 to 6, characterized in that, The overheat removal component (5) includes a gas baffle plate (504), and the gas baffle plate (504) is located between the overheat removal chamber inlet (501A) and the gas equalizing plate (502).

10. The overheat removal component according to any one of claims 1 to 6, characterized in that, the two kinds of gas equalizing holes groups on the gas equalizing plate (502) are symmetrically arranged with respect to the overheat removal chamber inlet (501A).

11. The overheat removal component according to any one of claims 1 to 6, characterized in that, Among them, α is the product of the logarithmic mean temperature difference and the heat transfer area, and the value range of α is 10 to 100, with the unit of m 2 *K; m is the number of the first heat exchange tubes (503); D is the outer diameter of the first heat exchange tubes (503), in m; L is the length of the pipe sections of the first heat exchange tubes (503) located in the overheat removal chamber (501C), in m; T in is the temperature of the gaseous working medium entering the said superheat chamber (501C), with the unit of K; T out is the temperature of the gaseous working medium flowing out of the superheat chamber (501C), in K; T wall is the average outer surface temperature of the pipe section of the first heat exchange pipe (503) located in the de-superheating chamber (501C), with the unit of K.

12. A heat exchanger, characterized in that, comprising: a housing (3) having a gaseous working medium inlet (3A) and a liquid working medium outlet (3B); the overheat removal component (5) according to any one of claims 1 to 11, the partition wall (501) of the overheat removal component (5) divides the internal space of the housing (3) into the overheat removal chamber (501C) and a condensation chamber (3C), the gaseous working medium inlet (3A) is communicated with the overheat removal chamber inlet (501A), and the condensation chamber (3C) is communicated with the overheat removal chamber outlet (501B) and the liquid working medium outlet (3B); and a second heat exchange tube (4) located in the condensation chamber (3C) and configured to condense the gaseous working medium entering the condensation chamber (3C) from the overheat removal chamber (501C) into a liquid working medium.

13. The heat exchanger according to claim 12, characterized in that, it further includes a support plate assembly (6), the support plate assembly includes a support plate (601), the partition wall (501) is connected to the support plate (601), and the support plate (601) is connected to the inner wall of the housing (3).

14. The heat exchanger according to claim 13, characterized in that, the support plate assembly (6) further includes a support rod (602), and the support rod (602) connects the support plate (601) and a tube sheet (7) for supporting the second heat exchange tube (4).

15. The heat exchanger according to claim 12, characterized in that, the housing (3) is cylindrical, the partition wall (501) is a box body having the overheat removal chamber (501C) and extends along the axial direction of the housing (3), and the first heat exchange tube (503) and the second heat exchange tube (4) extend along the axial direction of the housing (3).

16. The heat exchanger according to claim 15, characterized in that, the box body is symmetrically arranged with respect to the plane passing through the center line of the gaseous working medium inlet (3A) and the axis of the housing (3), wherein, the ratio of the distance in the radial direction of the housing (3) of the cross section of the box body in the plane to the inner diameter of the housing (3) is 0.1 to 0.35; and / or the ratio of the length of the box body to the length of the housing (3) is 0.4 to 1.

17. The heat exchanger according to claim 15, It is characterized in that Axial ends of the partition wall (501) and axial ends of the housing (3) have intervals respectively, a middle part of the first heat exchange tube (503) is located in the superheat removal chamber (501C), and two ends of the first heat exchange tube (503) are located in the condensation chamber (3C).

18. The heat exchanger according to any one of claims 12 to 17, It is characterized in that A ratio of the number of the first heat exchange tubes (503) to a sum of the numbers of the first heat exchange tubes (503) and the second heat exchange tubes (4) is 3 to 20%.

19. A refrigeration system includes a condenser, It is characterized in that The condenser is the heat exchanger according to any one of claims 12 to 18.

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