Heat exchanger and heat recovery system

Abstract

The utility model relates to a heat exchanger and a heat recovery system.The heat exchanger comprises a first heat exchange part and a second heat exchange part, the first heat exchange part comprises a first collecting pipe, a second collecting pipe and a plurality of first heat exchange pipes, the first collecting pipe and the second collecting pipe are arranged at intervals, each first heat exchange pipe is provided with a first pipe cavity, and the first pipe cavity communicates with the first collecting pipe and the second collecting pipe; the second heat exchange part comprises a third collecting pipe, a fourth collecting pipe and a plurality of second heat exchange pipes, the third collecting pipe and the fourth collecting pipe are arranged at intervals, the second heat exchange pipes extend in the length direction of the first heat exchange pipes and are arranged in the first pipe cavities in a sleeved mode, the second heat exchange pipes are provided with second pipe cavities, and the second heat exchange pipes penetrate through the first collecting pipe and the second collecting pipe; and a second pipe cavity of the second heat exchange pipe is communicated with the third collecting pipe and the fourth collecting pipe. The heat exchanger can reduce the filling amount of the refrigerant while meeting the heat exchange performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchange, in particular to a heat exchanger for data center and a heat recovery system. BACKGROUND

[0002] With the year-by-year growth of the scale of data center, its energy consumption is also gradually increasing, and the energy consumption of data center is composed of power supply and distribution, lighting, heat dissipation and cooling, and IT equipment power consumption. Among them, the air conditioning energy consumption accounts for about 30%-50%, the cooling cost is high, and the energy saving potential is large. In the related art, the data center usually discharges heat to the air in the form of water cooling or air cooling, or uses the expanded tube finned tube heat exchanger for heat recovery, but the charge amount of the refrigerant of the finned tube heat exchanger is large when the heat exchanger recovers heat, which is not conducive to reducing the heat exchange cost when the data center recovers heat. CONTENT OF THE UTILITY MODEL

[0003] The first aspect of the present application provides a heat exchanger which can reduce the charge amount of refrigerant while meeting the heat exchange performance.

[0004] The heat exchanger provided by the first aspect of the present application comprises a first heat exchange part and a second heat exchange part, the first heat exchange part comprises a first header, a second header and a plurality of first heat exchange tubes, the first header and the second header are arranged at intervals, the first heat exchange tube has a first tube cavity, and the first tube cavity communicates the first header and the second header; the second heat exchange part comprises a third header, a fourth header and a plurality of second heat exchange tubes, the third header and the fourth header are arranged at intervals, the second heat exchange tube extends along the length direction of the first heat exchange tube and is sleeved in the first tube cavity, the second heat exchange tube has a second tube cavity, the second heat exchange tube passes through the first header and the second header, and the second tube cavity of the second heat exchange tube communicates the third header and the fourth header.

[0005] The second heat exchange tube of the heat exchanger is sleeved in the first tube cavity of the first heat exchange tube, and when the heat exchanger works, the gap between the first heat exchange tube and the second heat exchange tube can be used for circulating refrigerant, and the second heat exchange tube can be used for circulating refrigerant or heat exchange medium. Since the second heat exchange tube is sleeved in the first tube cavity, the two kinds of heat exchange medium can be fully heat exchanged, and the flow area of the first heat exchange tube is also reduced, thereby reducing the charge amount of refrigerant.

[0006] The second aspect of the present application provides a heat recovery system which can reduce the heat exchange cost when the data center recovers heat.

[0007] The heat recovery system provided in the second aspect of this application includes an air conditioning system, a heat recovery system, and a heat exchanger. The heat exchanger is the same as the one in the first aspect embodiment. The first heat exchange section is connected to the piping of the air conditioning system, and the second heat exchange section is connected to the piping of the heat recovery system.

[0008] The heat exchanger used in this heat recovery system is the same as the one in the first aspect embodiment. Since the heat exchanger in the first aspect embodiment reduces the amount of refrigerant charged while meeting the heat exchange performance requirements, this heat recovery system has a lower heat exchange cost when recovering heat from data centers. Attached Figure Description

[0009] Figure 1 A schematic diagram of the structure of the heat exchanger provided in this application in a specific embodiment;

[0010] Figure 2 for Figure 1 Schematic diagram of the planar structure of the intermediate heat exchanger;

[0011] Figure 3 for Figure 1 A schematic diagram showing the connection between the first and second heat exchange tubes of the intermediate heat exchanger.

[0012] Figure 4 for Figure 1 A schematic diagram of the structure of the first heat exchange tube and the second heat exchange tube in a specific embodiment;

[0013] Figure 5 This is a schematic cross-sectional view of the second sub-tube in one specific embodiment;

[0014] Figure 6 This is a cross-sectional schematic diagram of the second sub-tube in another specific embodiment;

[0015] Figure 7 This is a schematic cross-sectional view of the second sub-tube in yet another specific embodiment;

[0016] Figure 8 for Figure 1 A schematic diagram of the structure of the fins in a specific embodiment;

[0017] Figure 9 A schematic diagram of the structure of the heat recovery system provided in this application in a specific embodiment.

[0018] The drawings show: a first heat exchange part 100, a second heat exchange part 200, a first header 1, a second header 2, a first heat exchange tube 3, a first lumen 31, a first protrusion 32, a third header 4, a fourth header 5, a second heat exchange tube 6, a second lumen 61, a second sub-tube 62, a second protrusion 63, a third protrusion 64, a fin 7, a first through hole 71, a reinforcing rib 72, a first protruding part 73, an air conditioning system 8, a first throttling device 81, an evaporator 82, a first compressor 83, a heat recovery system 9, a water pump 91, a plate heat exchanger 92, a dry cooler 93, a second compressor 94, a water tank 95, a second throttling device 96.

[0019] The drawings incorporated into the specification and forming a part of the specification, show embodiments consistent with the present application, and together with the specification serve to explain the principles of the application. DETAILED DESCRIPTION

[0020] In order to better understand the technical solutions of the present application, the embodiments of the present application are described in detail below with reference to the drawings.

[0021] It should be clear that the described embodiments are only part of the technical solutions of the present application, but not all the technical solutions. Based on the technical solutions in the present application, all other technical solutions obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0022] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0023] It should be understood that the term "and / or" used herein is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0024] It should be noted that the "up", "down", "left", "right" and other orientation words described in the embodiments of the present application are described from the angle shown in the drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it should also be understood that when referring to an element connected to another element "on" or "below", it can be directly connected to another element "on" or "below", or indirectly connected to another element "on" or "below" through an intermediate element.

[0025] As Figures 1-8As shown, the first aspect of the embodiment of the present application provides a heat exchanger, which comprises a first heat exchange part 100 and a second heat exchange part 200. The first heat exchange part 100 comprises a first header 1, a second header 2 and a plurality of first heat exchange tubes 3. The first header 1 is arranged apart from the second header 2. The first heat exchange tube 3 has a first tube cavity 31. The first tube cavity 31 is in communication with the first header 1 and the second header 2. The second heat exchange part 200 comprises a third header 4, a fourth header 5 and a plurality of second heat exchange tubes 6. The third header 4 is arranged apart from the fourth header 5. The second heat exchange tube 6 extends along the length direction of the first heat exchange tube 3 and is sleeved in the first tube cavity 31. The second heat exchange tube 6 has a second tube cavity 61. The second heat exchange tube 6 passes through the first header 1 and the second header 2. The second tube cavity 61 of the second heat exchange tube 6 is in communication with the third header 4 and the fourth header 5.

[0026] In the embodiment, the first header 1 and the second header 2 are arranged apart. The third header 4 and the fourth header 5 are also arranged apart. The distance between the third header 4 and the fourth header 5 is greater than the distance between the first header 1 and the second header 2. In this way, the second heat exchange tube 6 can be in communication with the third header 4 and the fourth header 5 after passing through the first header 1 and the second header 2. Generally, the third header 4 and the fourth header 5 are respectively located on the side of the first header 1 and the second header 2 away from the first heat exchange tube 3. However, in some use scenarios where the second heat exchange tube 6 needs to be bent, the third header 4 and the fourth header 5 can also be located on the radial side of the first header 1 and the second header 2. This is not specifically limited herein.

[0027] The first header 1, the second header 2, the third header 4 and the fourth header 5 can be in the shape of a cylindrical or rectangular column. Generally, in order to reduce the flow resistance of the tube body to the refrigerant and the heat exchange medium, the preferred tube shape is a cylinder. After the second heat exchange tube 6 passes through the first header 1 and the second header 2, the gap between the first header 1, the second header 2 and the second heat exchange tube 6 can be welded and fixed by brazing or the like, so as to maintain the sealing of the connection.

[0028] In the heat exchanger of the embodiment, the second heat exchange tube 6 is sleeved in the first tube cavity 31 of the first heat exchange tube 3. When the heat exchanger is working, the gap between the first heat exchange tube 3 and the second heat exchange tube 6 can be used for flowing the refrigerant. The second heat exchange tube 6 can be used for flowing the refrigerant or the heat exchange medium (for example, water). Since the second heat exchange tube 6 is sleeved in the first tube cavity 31, the two heat exchange media can be fully heat exchanged while reducing the flow area of the first heat exchange tube 3, thereby reducing the charge amount of the refrigerant.

[0029] As shown in the drawings, Figures 4-5As shown in the drawings, in one specific embodiment, the first heat exchange pipe 3 comprises a plurality of first protrusions 32, the first protrusions 32 are located on the inner side of the pipe wall of the first heat exchange pipe 3, the plurality of first protrusions 32 are arranged at intervals along the circumference of the first heat exchange pipe 3, and the end portions of at least some of the first protrusions 32 abut or are fixedly connected to the outer wall of the second heat exchange pipe 6.

[0030] The first protrusions 32 can increase the contact area between the refrigerant and the pipe wall of the first heat exchange pipe 3, so that the refrigerant can more easily contact the pipe wall of the first heat exchange pipe 3, thereby improving the heat exchange effect. At the same time, the first protrusions 32 can also play a certain distribution role for the refrigerant, preventing the refrigerant from gathering too much at a certain position, thereby making the refrigerant flow more evenly in the gap between the first heat exchange pipe 3 and the second heat exchange pipe 6. In addition, when the end portions of the first protrusions 32 abut or are fixedly connected to the outer wall of the second heat exchange pipe 6, the second heat exchange pipe 6 can also be limited, preventing the second heat exchange pipe 6 from shaking when the refrigerant in the second heat exchange pipe 6 flows. It should be noted that the first heat exchange pipe 3 and the second heat exchange pipe 6 can be integrally formed or formed by brazing or other methods. In addition, the cross-sectional shape of the first protrusions 32 can be trapezoidal or conical, and the like, which is not limited in this regard.

[0031] As shown in the drawings, Figure 6 In one specific embodiment, the portion of the second heat exchange pipe 6 located in the first lumen 31 is defined as a second sub-pipe 62, the second sub-pipe 62 comprises a plurality of second protrusions 63, the second protrusions 63 are located on the outer side of the pipe wall of the second sub-pipe 62, the plurality of second protrusions 63 are arranged at intervals along the circumference of the second sub-pipe 62, and the second protrusions 63 are arranged in a staggered manner with the first protrusions 32.

[0032] In this embodiment, by arranging the second protrusions 63 on the outer side of the pipe wall of the second sub-pipe 62, the contact area between the second sub-pipe 62 and the first heat exchange pipe 3 can be increased, thereby improving the heat exchange effect between the refrigerant or heat exchange medium in the second sub-pipe 62 and the refrigerant in the first heat exchange pipe 3. It should be noted that the heat exchange medium mentioned here includes water and other conventional media that do not undergo phase change, while the refrigerant refers to heat exchange medium that can undergo phase change. After the second sub-pipe 62 is provided with the second protrusions 63, the number of first protrusions 32 can be reduced and the interval can be increased according to actual needs. In addition, the second protrusions 63 can also limit the position of the first heat exchange pipe 3 and the second heat exchange pipe 6.

[0033] As shown in the drawings, Figure 7 In one specific embodiment, the second heat exchange pipe 6 further comprises a plurality of third protrusions 64, the third protrusions 64 are located on the inner side of the pipe wall of the second heat exchange pipe 6, the plurality of third protrusions 64 are arranged at intervals along the circumference of the second heat exchange pipe 6, and the length of the third protrusions 64 is less than the inner wall width of the second sub-pipe 62.

[0034] The function of the third protrusion 64 is similar to that of the first protrusion 32; that is, the third protrusion 64 can increase the contact area between the refrigerant or heat exchange medium and the second daughter tube 62, thereby improving the heat exchange effect between the refrigerant or heat exchange medium and the second heat exchange tube 6. Combined with the second protrusion 63 and / or the first protrusion 32, it can improve the overall heat exchange effect between the second heat exchange tube 6 and the first heat exchange tube 3. In addition, the third protrusion 64 can also play a certain role in distributing the refrigerant or heat exchange medium, reducing the accumulation of refrigerant at a certain location. It should be noted that the shape and structure of the third protrusion 64 and the second protrusion 63 can be similar to or the same as the shape and structure of the first protrusion 32; therefore, this will not be elaborated upon further.

[0035] like Figure 8 As shown, in one specific embodiment, the heat exchanger further includes multiple fins 7, which are stacked and arranged in layers. Each fin 7 has multiple first through holes 71, which are spaced apart along the length of the fin 7. A first heat exchange tube 3 is disposed within at least a portion of the first through holes 71 along the stacking direction of the fins 7. The heat exchanger uses through-tube fins, which can be fixed to the first heat exchange tube 3 by brazing after assembly. Through-tube fins have high heat exchange efficiency and strong anti-clogging ability, making them more suitable for outdoor scenarios with severe clogging compared to conventional corrugated or comb-shaped fins.

[0036] It should be noted that since the main heat exchange area between the first heat exchange tube 3 and the second heat exchange tube 6 is the area where the first heat exchange tube 3 is located, only fins need to be arranged on the first heat exchange tube 3, while the outer wall of the second heat exchange tube 6 does not need to be finned, thus reducing the overall cost. Furthermore, the first heat exchange section 100, the second heat exchange section 200, and the fins 7 can all be made of aluminum alloy. As the price of copper gradually increases, the cost of copper tube heat exchangers also increases; therefore, using aluminum alloy can effectively reduce the manufacturing cost of the heat exchanger.

[0037] like Figure 8 As shown, in one specific embodiment, the fin 7 also has a plurality of reinforcing ribs 72 and a plurality of first protrusions 73. The reinforcing ribs 72 are located on at least one side of the first through hole 71 along the width direction, and the first protrusions 73 are located between two adjacent first through holes 71. The reinforcing ribs 72 and the first protrusions 73 protrude outward from one side of the fin 7 along the thickness direction.

[0038] After the first through holes 71 are formed on the fins 7, the strength of the fins 7 is reduced, and the fins 7 may be tilted and deformed after being inserted into the first heat exchange pipes 3. Therefore, the reinforcing ribs 72 are arranged to reduce the tilting and deformation of the fins 7. Generally, the reinforcing ribs 72 are arranged on both sides of the first through holes 71 in the width direction, and the length of the reinforcing ribs 72 is greater than the opening length of the first through holes 71, so that the overall strength of the fins 7 is increased. The first protrusions 73 protrude from one side of the fins 7 in the thickness direction, and are mainly used to increase the contact area of the fins 7 with air, so as to improve the heat exchange efficiency of the fins.

[0039] As shown in Figures 4-7 In one embodiment, the first passage is defined as the first lumen 31 between the inner wall of the first heat exchange pipe 3 and the outer wall of the second heat exchange pipe 6, and the second passage is defined as the second lumen 61, and the flow area of the first passage is smaller than that of the second passage.

[0040] As can be seen from the above embodiments, the gap between the first heat exchange pipe 3 and the second heat exchange pipe 6 can be used for flowing the refrigerant, and the second heat exchange pipe 6 can be used for flowing the refrigerant or the heat exchange medium such as water. When the second heat exchange pipe 6 is used for flowing the heat exchange medium such as water which does not change phase, the flow area of the second passage is greater than that of the first passage, so that the second lumen 61 of the second heat exchange pipe 6 can accommodate more heat exchange medium, thereby facilitating the heat exchange between the heat exchange medium and the refrigerant.

[0041] As shown in Figure 9 The second aspect of the present application provides a heat recovery system, which includes an air conditioning system 8, a heat recovery system 9, and a heat exchanger. The heat exchanger is the heat exchanger in the first aspect, the first heat exchange part 100 is connected with the pipeline of the air conditioning system 8, and the second heat exchange part 200 is connected with the pipeline of the heat recovery system 9.

[0042] The heat exchanger for heat recovery of the heat recovery system is the heat exchanger in the first aspect. Since the heat exchanger in the first aspect reduces the charge amount of the refrigerant while meeting the heat exchange performance, the heat recovery system has lower heat exchange cost when recovering heat from the data center.

[0043] When the heat exchanger of the first aspect embodiment is applied to the heat recovery system of the second aspect embodiment, the refrigerant flow direction in the first heat exchange section 100 is opposite to the refrigerant flow direction in the second heat exchange section 200. That is, the refrigerant flow direction in the first heat exchange section 100 is: refrigerant enters from the first manifold 1, flows into the second manifold 2 through multiple first heat exchange tubes 3, while the refrigerant flow direction in the second heat exchange section 200 is: refrigerant or water, or other heat exchange medium, enters from the fourth manifold 5 into multiple second heat exchange tubes 6, and then flows out from the third manifold 4. The refrigerant flowing in opposite directions can facilitate heat exchange.

[0044] like Figure 9 As shown, in one specific embodiment, the air conditioning system 8 includes a first throttling device 81, an evaporator 82, and a first compressor 83 connected by pipes. A first manifold 1 is connected to an interface pipe of the first compressor 83, and a second manifold 2 is connected to an interface pipe of the first throttling device 81. The heat recovery system 9 includes a water pump 91, a plate heat exchanger 92, and a dry cooler 93 connected by pipes. A third manifold 4 is connected to an interface pipe of the water pump 91, and a fourth manifold 5 is connected to an interface pipe of the dry cooler 93.

[0045] When the air conditioning system 8 is running, the first heat exchange section 100 of the heat exchanger works as the condenser of the air conditioning system 8, while the second heat exchange section 200 acts as a heat exchanger for heat recovery in the heat recovery system 9, collecting the heat source of the air conditioning system 8. The heated heat source can be used for industrial and domestic hot water or domestic heating.

[0046] like Figure 9 As shown, in one specific embodiment, the heat recovery system 9 further includes a second compressor 94, a water tank 95, and a second throttling element 96 connected by pipelines. One interface of the plate heat exchanger 92 is connected to the second compressor 94 by pipeline, and the other interface of the plate heat exchanger 92 is connected to the second throttling element 96 by pipeline.

[0047] The second heat exchange section 200 recovers waste heat from the air conditioning system 8, and then exchanges heat with the working fluid of the heat pump system flowing in the plate heat exchanger 92. After cooling, the working fluid is cooled again by the dry cooler 93 before entering the second heat exchange section 200 to cool the working fluid on the first heat exchange section 100 side. When the heat pump section is not turned on, the heat recovery system 9 can also be cooled by the dry cooler 93 to improve heat dissipation efficiency.

[0048] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A heat exchanger, characterized by, The heat exchanger comprises a first heat exchange part (100) and a second heat exchange part (200), the first heat exchange part (100) comprises a first header (1), a second header (2) and a plurality of first heat exchange tubes (3), the first header (1) and the second header (2) are arranged at intervals, the first heat exchange tube (3) has a first lumen (31), the first lumen (31) is communicated with the first header (1) and the second header (2); the second heat exchange part (200) comprises a third header (4), a fourth header (5) and a plurality of second heat exchange tubes (6), the third header (4) and the fourth header (5) are arranged at intervals, the second heat exchange tube (6) extends along the length direction of the first heat exchange tube (3) and is sleeved in the first lumen (31), the second heat exchange tube (6) has a second lumen (61), the second heat exchange tube (6) penetrates through the first header (1) and the second header (2), and the second lumen (61) of the second heat exchange tube (6) is communicated with the third header (4) and the fourth header (5).

2. The heat exchanger of claim 1, wherein The first heat exchange tube (3) comprises a plurality of first protrusions (32), the first protrusions (32) are located on the inner side of the tube wall of the first heat exchange tube (3), a plurality of the first protrusions (32) are arranged at intervals along the circumference of the first heat exchange tube (3), and the end of at least part of the first protrusions (32) is abutted or fixedly connected with the outer wall of the second heat exchange tube (6).

3. The heat exchanger of claim 2, wherein The part of the second heat exchange tube (6) located in the first lumen (31) is defined as a second sub-tube (62), the second sub-tube (62) comprises a plurality of second protrusions (63), the second protrusions (63) are located on the outer side of the tube wall of the second sub-tube (62), a plurality of the second protrusions (63) are arranged at intervals along the circumference of the second sub-tube (62), and the second protrusions (63) are arranged in a staggered manner with the first protrusions (32).

4. The heat exchanger of claim 3, wherein The second heat exchange tube (6) further comprises a plurality of third protrusions (64), the third protrusions (64) are located on the inner side of the tube wall of the second heat exchange tube (6), a plurality of the third protrusions (64) are arranged at intervals along the circumference of the second heat exchange tube (6), and the length of the third protrusions (64) is smaller than the width of the inner wall of the second sub-tube (62).

5. The heat exchanger according to any one of claims 1-4, characterized in that The heat exchanger further comprises a plurality of fins (7), a plurality of the fins (7) are arranged in a stacked manner, the fin (7) has a plurality of first through holes (71), a plurality of the first through holes (71) are arranged at intervals along the length direction of the fin (7), and the first heat exchange tube (3) is arranged in at least part of the first through holes (71) along the stacking direction of the fin (7).

6. The heat exchanger of claim 5, wherein The fin (7) further has a plurality of reinforcing ribs (72) and a plurality of first protrusions (73), the reinforcing rib (72) is located on at least one side of the first through hole (71) along the width direction, the first protrusion (73) is located between adjacent two first through holes (71), and the reinforcing rib (72) and the first protrusion (73) protrude outward from one side of the fin (7) along the thickness direction.

7. The heat exchanger of claim 5, wherein The first passage is defined as the first lumen (31) between the inner wall of the first heat exchange pipe (3) and the outer wall of the second heat exchange pipe (6), and the second passage is defined as the second lumen (61), and the flow cross-sectional area of the first passage is smaller than that of the second passage.

8. A heat recovery system characterized by, The air conditioning system (8), the heat recovery system (9) and the heat exchanger are included, the heat exchanger is the heat exchanger according to any one of claims 1-7, the first heat exchange part (100) is connected with the pipeline of the air conditioning system (8), and the second heat exchange part (200) is connected with the pipeline of the heat recovery system (9).

9. The heat recovery system of claim 8, wherein, The air conditioning system (8) includes a first throttling device (81), an evaporator (82) and a first compressor (83) connected by pipelines, one interface of the first header (1) is connected with the first compressor (83) by a pipeline, and one interface of the second header (2) is connected with the first throttling device (81) by a pipeline; the heat recovery system (9) includes a water pump (91), a plate heat exchanger (92) and a dry cooler (93) connected by pipelines, one interface of the third header (4) is connected with the water pump (91) by a pipeline, and one interface of the fourth header (5) is connected with the dry cooler (93) by a pipeline.

10. The heat recovery system of claim 9, wherein, The heat recovery system (9) further includes a second compressor (94), a water tank (95) and a second throttling device (96) connected by pipelines, one interface of the plate heat exchanger (92) is connected with the second compressor (94) by a pipeline, and the other interface of the plate heat exchanger (92) is connected with the second throttling device (96) by a pipeline.

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