Heat exchanger set and refrigerating system

Abstract

The invention provides a heat exchanger set and a refrigerating system with the heat exchanger set. The heat exchanger set comprises a first heat exchanger with a first heat exchanger primary side and a first heat exchanger secondary side, and a second heat exchanger with a second heat exchanger primary side and a second heat exchanger secondary side. A first heat exchanger primary side outlet is connected with a second heat exchanger primary side inlet, a second heat exchanger secondary side inlet pipeline is connected with a first heat exchanger secondary side inlet pipeline, and a second heat exchanger secondary side outlet pipeline is connected with a first heat exchanger secondary side outlet, so that the temperature of a primary side medium flowing out of the heat exchanger set is further reduced; the overall temperature of the secondary side medium flowing into the secondary side of the first heat exchanger is increased, the heat exchange requirement of the first heat exchanger is reduced, the heat exchange efficiency is further improved, meanwhile, the filling amount of the primary side medium is reduced, and the cost of the heat exchanger is reduced.

Description

[0001] This application claims priority to Chinese Patent Application 202411611845.4, all of which are set forth in Chinese Patent Application 202411611845.4. Technical Field

[0002] This application relates to the field of refrigeration / cooling equipment technology, specifically to a heat exchanger assembly and a refrigeration system using the heat exchanger assembly. Background Technology

[0003] Compared to traditional refrigerants, low-GWP refrigerants have a lower global warming potential, have a smaller impact on climate warming, and most low-GWP refrigerants do not damage the ozone layer.

[0004] Considering the environmental impact of traditional refrigerants, the use of more environmentally friendly low-GWP refrigerants is gradually becoming the preferred solution for refrigeration systems, driving the refrigeration industry towards a greener and more sustainable direction. However, compared to traditional refrigerants, low-GWP refrigerants are usually more expensive, increasing the initial investment cost of refrigeration systems.

[0005] In existing technologies, for chiller units or heat pump units using flooded (submerged) condensers, when the temperature rise of the cooling water inside the condenser reaches 10-40K, a large subcooling area is required to achieve optimal unit performance. Traditional subcoolers may contain a significant proportion of the total refrigerant charge in the condenser, necessitating the use of a large amount of low-GWP refrigerant. Furthermore, considering the heat exchange between the water and refrigerant in the condenser via copper tubes, more copper tubes are needed to increase the heat exchange area within the condenser, resulting in higher costs. Summary of the Invention

[0006] This application aims to provide a heat exchanger assembly and a refrigeration system using the heat exchanger assembly, so as to at least solve or alleviate some of the problems existing in the prior art.

[0007] This application provides a heat exchanger assembly, which includes a first heat exchanger having a primary side and a secondary side; a first heat exchanger secondary side inlet pipe connected to the first heat exchanger through an inlet on the secondary side of the first heat exchanger; a second heat exchanger having a primary side and a secondary side; a second heat exchanger primary side inlet pipe with one end connected to the outlet of the primary side of the first heat exchanger and the other end connected to the inlet of the primary side of the second heat exchanger; a second heat exchanger secondary side inlet pipe with one end connected to the inlet of the secondary side of the first heat exchanger and the other end connected to the inlet of the secondary side of the second heat exchanger; and a second heat exchanger secondary side outlet pipe with one end connected to the inlet of the secondary side of the first heat exchanger and the other end connected to the outlet of the secondary side of the second heat exchanger.

[0008] In optional technical solutions, the heat exchanger assembly also includes a water pump installed on the secondary side inlet pipe or the secondary side outlet pipe of the second heat exchanger.

[0009] In the optional technical solution, the medium in the primary side of the first heat exchanger flows in the opposite direction to the medium in the secondary side of the first heat exchanger; the medium in the primary side of the second heat exchanger flows in the opposite direction to the medium in the secondary side of the second heat exchanger.

[0010] In the optional technical solution, the medium in the primary side of the first heat exchanger and the primary side of the second heat exchanger is a refrigerant; the medium in the secondary side of the first heat exchanger and the secondary side of the second heat exchanger is water.

[0011] In the optional technical solution, the medium in the primary side of the first heat exchanger and the primary side of the second heat exchanger is a low-GWP refrigerant selected from any one of R515B, R513A or R1234ze.

[0012] In the optional technical solutions, the first heat exchanger is a flooded heat exchanger; the second heat exchanger is a plate heat exchanger.

[0013] In an optional technical solution, the heat exchanger assembly also includes a second heat exchanger primary side outlet pipe connected to the second heat exchanger through the outlet of the primary side of the second heat exchanger, wherein the medium flowing out from the second heat exchanger primary side outlet pipe is a saturated liquid.

[0014] In the optional technical solution, the water flow rate through the water pump accounts for less than 80% of the total water flow through the inlet of the secondary side of the first heat exchanger.

[0015] In the optional technical solution, the first heat exchanger has a first inlet on the secondary side of the first heat exchanger and a second inlet on the secondary side of the first heat exchanger, the inlet pipe on the secondary side of the first heat exchanger is connected to the first inlet on the secondary side of the first heat exchanger; the outlet pipe on the secondary side of the second heat exchanger is connected to the second inlet on the secondary side of the first heat exchanger.

[0016] In another aspect, this application also provides a refrigeration system, including a compressor, a condenser, a subcooler, an expansion valve, and an evaporator connected in sequence by refrigerant pipes, wherein the connection relationship between the condenser and the subcooler constitutes a heat exchanger group as described in any one of claims 1-9, wherein the condenser is a first heat exchanger and the subcooler is a second heat exchanger. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the heat exchanger assembly provided in the first embodiment of this application.

[0018] Figure 2 This is a schematic diagram of the heat exchanger assembly provided in the first embodiment of this application.

[0019] Figure 3 This is a schematic diagram of the heat exchanger assembly provided in the second embodiment of this application.

[0020] Figure 4 This is a schematic diagram of the heat exchanger assembly provided in the second embodiment of this application.

[0021] Figure 5 This is a schematic diagram of the refrigeration system provided in the third embodiment of this application.

[0022] Reference numerals: Heat exchanger assembly 101, first heat exchanger 1, second heat exchanger 2, primary side of first heat exchanger 11, secondary side of first heat exchanger 12, heat exchange tube bundle 120, inlet pipe of secondary side of first heat exchanger 121, tube sheet 13, first chamber 14, baffle 141, inlet area of ​​first chamber 142, outlet area of ​​first chamber 143, second chamber 15, primary side of second heat exchanger 21, secondary side of second heat exchanger 22, inlet pipe of primary side of second heat exchanger 211, outlet pipe of primary side of second heat exchanger 212, inlet pipe of secondary side of second heat exchanger 221, outlet pipe of secondary side of second heat exchanger 222, water pump 2212, first inlet of secondary side of first heat exchanger 1211, second inlet of secondary side of first heat exchanger 1212, refrigeration system 3, compressor 31, condenser 32, subcooler 33, expansion valve 34, evaporator 35. Detailed Implementation

[0023] It should be noted that the following will use examples to illustrate the working principle, features and advantages of the refrigeration equipment according to this application. However, it should be understood that all descriptions are given for illustrative purposes only and should not be construed as limiting the application in any way.

[0024] Furthermore, for any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature shown or implied in the various figures, this application still allows for any combination or deletion of these technical features (or their equivalents) without any technical obstacle, thereby obtaining more other embodiments of this application that may not be directly mentioned herein.

[0025] In addition, the term "primary side" as used in this application refers to the heat-exporting side, which is the side of the heat exchanger with a higher temperature, while the term "secondary side" as used in this application refers to the heat-absorbing side, which is the side of the heat exchanger with a lower temperature.

[0026] <First Implementation Method>

[0027] Figure 1 This is a schematic diagram of the structure of the heat exchanger assembly 101 provided in the first embodiment of this application. (See attached diagram.) Figure 1As shown, the heat exchanger group 101 of this embodiment includes: a first heat exchanger 1 and a second heat exchanger 2, wherein the first heat exchanger 1 has a first heat exchanger primary side 11 and a first heat exchanger secondary side 12, and the second heat exchanger 2 has a second heat exchanger primary side 21 and a second heat exchanger secondary side 22.

[0028] Figure 1 The arrows in the diagram indicate the flow directions of the primary-side medium flowing through the primary side 11 of the first heat exchanger and the primary side 21 of the second heat exchanger, and the secondary-side medium flowing through the secondary side 12 of the first heat exchanger and the secondary side 22 of the second heat exchanger, respectively. Figure 1 As shown, the secondary side inlet pipe 121 of the first heat exchanger is connected to the first heat exchanger 1 through the inlet of the secondary side 12 of the first heat exchanger, allowing the secondary side medium from outside the first heat exchanger 1 to flow into the secondary side 12 of the first heat exchanger. Meanwhile, the heat exchanger assembly 101 also includes a primary side inlet pipe 211, a secondary side inlet pipe 221, and a secondary side outlet pipe 222 of the second heat exchanger. One end of the primary side inlet pipe 211 is connected to the outlet of the primary side 11 of the first heat exchanger, and the other end is connected to the inlet of the primary side 21 of the second heat exchanger, allowing the primary side medium in the primary side 11 to flow into the second heat exchanger 2 through the primary side inlet pipe 211 after heat exchange in the first heat exchanger 1. One end of the secondary side inlet pipe 221 of the second heat exchanger is connected to the secondary side inlet pipe 121 of the first heat exchanger, and the other end is connected to the inlet of the secondary side 22 of the second heat exchanger. This allows a portion of the secondary side medium flowing through the secondary side inlet pipe 121 of the first heat exchanger to be diverted into the secondary side inlet pipe 221 of the second heat exchanger and then into the secondary side 22 of the second heat exchanger. One end of the secondary side outlet pipe 222 of the second heat exchanger is connected to the inlet of the secondary side 12 of the first heat exchanger, and the other end is connected to the outlet of the secondary side 22 of the second heat exchanger. The secondary side medium flowing out of the secondary side 22 of the second heat exchanger flows through the secondary side outlet pipe 222 to the inlet of the secondary side 12 of the first heat exchanger, and then flows into the secondary side 12 of the first heat exchanger. A water pump 2212 is also installed on the secondary side inlet pipe 221 or the secondary side outlet pipe 222 of the second heat exchanger.

[0029] In the heat exchanger assembly 101 provided in the above embodiments of this application, the primary-side medium with a higher temperature enters the primary side 11 of the first heat exchanger and exchanges heat with the secondary-side medium with a lower temperature that flows into the secondary side 12 of the first heat exchanger through the inlet of the secondary side 12, thereby reducing the temperature of the primary-side medium. The primary-side medium flowing out of the primary side 11 of the first heat exchanger flows into the primary side 21 of the second heat exchanger through the primary-side inlet pipe 211 of the second heat exchanger, and exchanges heat with the secondary-side medium with a lower temperature in the secondary side 22 of the second heat exchanger, thereby further reducing the temperature of the primary-side medium flowing out of the second heat exchanger 2.

[0030] Meanwhile, a portion of the lower-temperature secondary medium from the outside enters the secondary side 12 of the first heat exchanger through the secondary side inlet pipe 121, while the other portion flows into the secondary side 22 of the second heat exchanger through the secondary side inlet pipe 221 connected to the secondary side inlet pipe 121. This secondary medium exchanges heat with the primary medium in the primary side 21, raising its temperature. The heated secondary medium is then transported to the inlet of the secondary side 12 of the first heat exchanger through the secondary side outlet pipe 222. Before entering the secondary side 12, it mixes with the secondary medium from the secondary side inlet pipe 121, resulting in a slightly higher temperature before entering the secondary side 12 compared to when it originates from the outside. This reduces the amount of heat exchanged between the primary side 11 and the secondary side 12, improving heat exchange efficiency.

[0031] The water pump 2212 provides driving force for the secondary side medium diverted from the secondary side inlet pipe 121 of the first heat exchanger, thereby increasing the pressure of the secondary side medium flowing through the secondary side inlet pipe 221 of the second heat exchanger. This reduces the pressure drop caused by the secondary side medium passing through the second heat exchanger 2, which leads to a decrease in the efficiency of the heat exchanger group 101.

[0032] Furthermore, the water pump 2212 can facilitate the control of the secondary medium flow rate through the secondary side inlet pipe 221 of the second heat exchanger, so as to appropriately adjust the temperature of the secondary medium entering the inlet of the secondary side 12 of the first heat exchanger and the temperature of the primary medium flowing out from the outlet of the primary side 21 of the second heat exchanger.

[0033] Through the above implementation method, the primary side medium flowing out of the primary side 11 of the first heat exchanger and a portion of the secondary side medium diverted from the secondary side inlet pipe 121 of the first heat exchanger to the secondary side 22 of the second heat exchanger exchanger exchange heat in the second heat exchanger 2. This further reduces the temperature of the primary side medium flowing out of the heat exchanger group 101, while increasing the overall temperature of the secondary side medium flowing into the secondary side 12 of the first heat exchanger. This reduces the heat exchange demand of the first heat exchanger 1 itself, thus appropriately reducing the primary side medium capacity of the first heat exchanger 1 and the total primary side medium charge of the heat exchanger group 101. Depending on the configuration of the heat exchanger group 101 and the refrigeration unit using the heat exchanger group 1, for example, the total primary side medium charge can be reduced by more than 25%, reducing the required amount of primary side medium and lowering costs. At the same time, the reduction in the overall heat exchange in the first heat exchanger 1 also reduces the area of ​​the primary side copper tubes inside the first heat exchanger 1, thereby reducing the overall volume of the first heat exchanger 1 and lowering the investment cost of the first heat exchanger 1.

[0034] As a preferred embodiment of this application, such as Figure 1 As shown, the primary medium in the primary side 11 of the first heat exchanger flows in the opposite direction to the secondary medium in the secondary side 12 of the first heat exchanger; the primary medium in the primary side 21 of the second heat exchanger flows in the opposite direction to the secondary medium in the secondary side 22 of the second heat exchanger. That is, the inlet of the primary side 11 of the first heat exchanger and the outlet of the secondary side 12 of the first heat exchanger are located on the same side, the outlet of the primary side 11 of the first heat exchanger and the inlet of the secondary side 12 of the first heat exchanger are located on the same side, the inlet of the primary side 21 of the second heat exchanger and the outlet of the secondary side 22 of the second heat exchanger are located on the same side, and the outlet of the primary side 21 of the second heat exchanger and the inlet of the secondary side 22 of the second heat exchanger are located on the same side.

[0035] Through the above implementation method, the high-temperature primary medium that has just flowed into the primary side 11 of the first heat exchanger (i.e., the front part of the primary side 11 of the first heat exchanger) exchanges heat with the high-temperature secondary medium that is about to flow out of the secondary side 12 of the first heat exchanger (i.e., the rear part of the secondary side 12 of the first heat exchanger). The primary medium that has been initially cooled down in the primary side 11 of the first heat exchanger (i.e., the primary medium in the rear part of the primary side 11 of the first heat exchanger) exchanges heat with the secondary medium with a lower temperature that flows into the secondary side 12 of the first heat exchanger (i.e., the secondary medium in the front part of the secondary side 12 of the first heat exchanger). By controlling the primary medium and the secondary medium inside the first heat exchanger 1 to always maintain the maximum temperature difference at different positions of the first heat exchanger 1 (i.e., the front part of the primary side 11 of the first heat exchanger and the rear part of the first heat exchanger 11), the heat exchange efficiency of the first heat exchanger 1 is improved. Similarly, the primary side medium (i.e., the front part of the primary side 21 of the second heat exchanger) that has been initially cooled and flows into the primary side 21 of the second heat exchanger exchanges heat with the secondary side medium (i.e., the rear part of the secondary side 22 of the second heat exchanger) that has been initially heated and is about to flow out of the secondary side 22 of the second heat exchanger. The low-temperature primary side medium (i.e., the rear part of the primary side 21 of the second heat exchanger) that is about to flow out of the primary side 21 of the second heat exchanger exchanges heat with the low-temperature secondary side medium (i.e., the front part of the secondary side 22 of the second heat exchanger) that flows into the secondary side 22 of the second heat exchanger. The maximum temperature difference is always maintained at different positions of the second heat exchanger 2, thereby improving the heat exchange efficiency of the second heat exchanger 2.

[0036] In a preferred embodiment of this application, the primary medium in the primary side 11 of the first heat exchanger and the primary side 21 of the second heat exchanger is a refrigerant, and the secondary medium in the secondary side 12 of the first heat exchanger and the secondary side 22 of the second heat exchanger is water.

[0037] In a preferred embodiment of this application, the medium in the primary side 11 of the first heat exchanger and the primary side 21 of the second heat exchanger is further preferably a low-GWP refrigerant selected from any one of R515B, R513A or R1234ze.

[0038] As a preferred embodiment of this application, such as Figure 1 As shown, the heat exchanger assembly 101 also includes a second heat exchanger primary side outlet pipe 212 connected to the second heat exchanger 2 via the outlet of the second heat exchanger primary side 21. The primary side medium flowing out of the second heat exchanger primary side outlet pipe 212 is a saturated liquid.

[0039] Through the above embodiments, the heat exchanger group 101 uses a low-GWP refrigerant selected from any one of R515B, R513A or R1234ze as the primary side medium and water as the secondary side medium. Compared with heat exchangers using conventional refrigerants, the heat exchanger group 101 provided in this application is more environmentally friendly and has a smaller impact on global warming. Through the combination and corresponding connection relationship of the first heat exchanger 1 and the second heat exchanger 2, the amount of refrigerant charged in the heat exchanger group 101 is reduced while still achieving the best heat exchange performance, saving the cost of refrigerant charging and reducing the initial investment cost of the heat exchanger group 101.

[0040] In a preferred embodiment of this application, the first heat exchanger 1 is a flooded heat exchanger and the second heat exchanger 2 is a plate heat exchanger.

[0041] Through the above implementation method, a flooded heat exchanger is used as the first heat exchanger 1. The first heat exchanger 1 is designed with a subcooled area. Since the refrigerant liquid covers part of the heat exchange surface of the heat exchanger, the temperature inside the first heat exchanger 1 can be distributed more evenly, thereby maintaining a stable outlet temperature of the primary side 11 of the first heat exchanger, avoiding local overheating, and also providing a better heat exchange surface for the first heat exchanger 1, thus improving the heat exchange efficiency.

[0042] A plate heat exchanger is used as the second heat exchanger 2. The plate heat exchanger consists of multiple thin plates with small plate spacing, providing a larger heat exchange area compared to other types of heat exchangers, thus achieving more efficient heat transfer. At the same time, the plate heat exchanger has a more compact structure, requiring less space and incurring lower costs during installation. By using a plate heat exchanger to handle part of the heat exchange demand in the first heat exchanger 1, the amount of copper tubes used in the first heat exchanger 1 is also reduced.

[0043] Although a plate heat exchanger is preferably used as the second heat exchanger 2 in this embodiment, this application is not limited to this. Other heat exchangers, such as microchannel heat exchangers (MCHX), are also acceptable. As long as the primary side medium discharged from the first heat exchanger 1 and the secondary side medium entering the second heat exchanger 2 can exchange heat in the second heat exchanger 2, they should be included within the scope of protection of this application.

[0044] Furthermore, although the preferred low-GWP refrigerant in the embodiments of this application is any one of R515B, R513A or R1234ze as the primary side medium, this application is not limited to this, and the use of other low-GWP refrigerants as the refrigerant should also be included within the scope of protection of this application.

[0045] Specifically, in the preferred embodiment of this application, the water flow rate through the water pump 2212 accounts for less than 80% of the total water flow through the inlet of the secondary side 12 of the first heat exchanger.

[0046] Through the above implementation method, the flow rate of the secondary side medium flowing through the water pump 2212 is controlled to be less than 80% of the total water flow through the inlet of the secondary side 12 of the first heat exchanger. This allows a larger amount of secondary side medium to be transported by the water pump 2212 to the second heat exchanger 2 for heat exchange with the primary side medium. After heat exchange, the overall temperature of the secondary side medium entering the secondary side of the first heat exchanger increases, thereby improving the heat exchange efficiency of the heat exchanger group 101.

[0047] Preferably, the water pump 2212 used in the embodiments of this application is a low-head pump, but this application is not limited to this. The selection of different specifications of water pump 2212 based on the pressure drop generated when the secondary side medium flowing through the secondary side inlet pipe 221 of the second heat exchanger passes through the second heat exchanger 2 should be included within the protection scope of this application.

[0048] Preferably, Figure 2 This is a schematic diagram of a preferred structure of the heat exchanger assembly 101 provided in the first embodiment of this application, and... Figure 1 The difference between the heat exchanger assembly 101 shown is that, as Figure 2 As shown, the first heat exchanger 1 also has a first inlet 1211 on the secondary side of the first heat exchanger and a second inlet 1212 on the secondary side of the first heat exchanger, wherein the inlet pipe 121 on the secondary side of the first heat exchanger is connected to the first inlet 1211 on the secondary side of the first heat exchanger. The outlet pipe 222 on the secondary side of the second heat exchanger is connected to the second inlet 1212 on the secondary side of the first heat exchanger.

[0049] Through the above-described preferred embodiments, the secondary medium flowing into the secondary side 12 of the first heat exchanger via the secondary side inlet pipe 121 of the first heat exchanger and the secondary side outlet pipe 222 of the second heat exchanger can enter the secondary side 12 of the first heat exchanger through the first inlet 1211 and the second inlet 1212 of the first heat exchanger secondary side respectively. This avoids the problems of flow control, pressure loss and inconvenience of maintenance that may be caused by the secondary medium flowing into the secondary side 12 of the first heat exchanger from the same outlet.

[0050] <Second Implementation Method>

[0051] The second embodiment of this application, which uses the same names and symbols as the first embodiment of this application, is identical in content and will not be repeated here.

[0052] Figure 3 This is a schematic diagram of a preferred structure of the heat exchanger assembly 101 provided in the second embodiment of this application, as shown below. Figure 3 As shown, the first heat exchanger 1 is also provided with a heat exchange tube bundle 120. The secondary side medium enters the first heat exchanger 1 through the inlet of the secondary side 12 of the first heat exchanger and then enters the heat exchange tube bundle 120, where it exchanges heat with the primary side medium outside the heat exchange tube bundle 120.

[0053] Preferably, tube sheets 13 are provided at both ends of the first heat exchanger corresponding to the heat exchange tube bundle. The tube sheets 13 and the shell of the first heat exchanger 1 enclose a first chamber 14 and a second chamber 15. The inlet and outlet of the secondary side 12 of the first heat exchanger are connected to the first chamber 14, and a partition 141 is provided inside the first chamber 14 to separate the inlet area 142 and the outlet area 143 of the first chamber. The secondary side medium passes through the secondary side 12 of the first heat exchanger. The medium enters the first chamber inlet region 142 through the inlet, flows through the heat exchange tube bundle 120 corresponding to the first chamber inlet region 142 and exchanges heat with the primary side medium outside the heat exchange tube bundle 120, and then enters the second chamber 15. It flows through the second chamber 15 into the heat exchange tube bundle 120 corresponding to the first chamber outlet region 142 and exchanges heat with the primary side medium outside the heat exchange tube bundle 120 again. After the heat exchange is completed, it flows into the first chamber outlet region 142 and flows out of the first heat exchanger through the outlet of the secondary side 12 of the first heat exchanger.

[0054] The difference between this heat exchanger assembly 101 and the one provided in the first embodiment is that the first inlet 1211 on the secondary side of the first heat exchanger is located at one end of the first heat exchanger 1, corresponding to the outlet of the first heat exchanger secondary side 12. That is, the first inlet 1211 on the secondary side of the first heat exchanger is connected to the inlet region 142 of the first chamber, and the second inlet 1212 on the secondary side of the first heat exchanger is located at the other end of the first heat exchanger 1. That is, the second inlet 1212 on the secondary side of the first heat exchanger is connected to the second chamber 15. The inlet pipe 121 on the secondary side of the first heat exchanger is connected to the first inlet 1211 on the secondary side of the first heat exchanger, and the outlet pipe 222 on the secondary side of the second heat exchanger is connected to the second inlet 1212 on the secondary side of the first heat exchanger.

[0055] The heat exchanger assembly 101 provided in the above embodiments of this application receives a portion of a lower-temperature secondary-side medium from the outside. This medium enters the first chamber inlet region 142 through the first heat exchanger secondary-side inlet pipe 121, while the other portion flows into the second heat exchanger secondary-side inlet pipe 221, which is connected to the first heat exchanger secondary-side inlet pipe 121. This secondary medium exchanges heat with the primary-side medium in the second heat exchanger primary-side 21, raising its temperature. The heated secondary-side medium is then transported to the second inlet region 142 of the first heat exchanger secondary-side through the second heat exchanger secondary-side outlet pipe 222. At port 1212, the medium enters the second chamber 15 of the first heat exchanger through the second inlet 1212 on the secondary side of the first heat exchanger. It then mixes with the secondary medium that enters the first chamber inlet region 142 through the first inlet 1211 on the secondary side of the first heat exchanger and flows into the second chamber 15 after completing heat exchange with the primary medium outside the heat exchange tube bundle 120 in the heat exchange tube bundle 120 corresponding to the first chamber inlet region 142. The mixed secondary medium then flows into the heat exchange tube bundle 120 corresponding to the first chamber outlet region 143 and exchanges heat again with the primary medium outside the heat exchange tube bundle 120 in the heat exchange tube bundle 120.

[0056] Through the above implementation method, the second heat exchanger 2 is connected in parallel with a portion of the heat exchange tube bundle 120 in the first heat exchanger 1. The secondary side medium flowing through the second heat exchanger 2 directly flows into the second chamber 15, which reduces the flow rate of the secondary side medium in the heat exchange tube bundle 120 corresponding to the inlet region 142 of the first chamber. This reduces the heat exchange between the primary side 11 and the secondary side 12 of the first heat exchanger to a certain extent, reduces the heat exchange demand of the first heat exchanger 1 itself, and can appropriately reduce the primary side medium capacity of the first heat exchanger 1, thereby reducing the total amount of primary side medium charged in the heat exchanger group 101.

[0057] Simultaneously, the secondary-side medium flowing into the first heat exchanger 1 from the first inlet 1211 on the secondary side of the first heat exchanger generates a pressure drop as it flows through the heat exchange tube bundle 120, forming a low-pressure zone in the second chamber 15. This pressure difference causes a portion of the secondary-side medium to be diverted from the secondary-side inlet pipe 121 of the first heat exchanger. The diverted secondary-side medium flows through the secondary side 22 of the second heat exchanger and then into the second chamber 15 of the first heat exchanger 1. There, it mixes with another portion of the secondary-side medium and enters the heat exchange tube bundle 120 corresponding to the outlet region 143 of the first chamber for heat exchange. Unlike the first embodiment, in the second embodiment, the secondary-side outlet pipe 222 of the second heat exchanger is connected to the second chamber 15. The pressure difference diverts a portion of the secondary-side medium from the secondary-side inlet pipe 121 of the first heat exchanger, reducing energy loss in the heat exchanger group 101 and improving the overall heat exchange efficiency of the heat exchanger group 101.

[0058] Figure 4 This is a schematic diagram of a preferred structure of the heat exchanger assembly 101 provided in the second embodiment of this application, as shown below. Figure 4 As shown, preferably, a water pump 2212 is also provided on the secondary side inlet pipe 221 or the secondary side outlet pipe 222 of the second heat exchanger.

[0059] The water pump 2212 provides driving force for the secondary side medium diverted from the secondary side inlet pipe 121 of the first heat exchanger, reducing the pressure drop caused by the secondary side medium passing through the second heat exchanger 2, which reduces the efficiency reduction of the heat exchanger assembly 101. At the same time, the driving force of the water pump 2212 increases the flow velocity of the secondary side medium flowing through the second heat exchanger 2, thereby improving the heat exchange efficiency of the heat exchanger assembly 101.

[0060] Meanwhile, the water pump 2212 can also facilitate the control of the secondary medium flow rate through the secondary side inlet pipe 221 of the second heat exchanger, so as to appropriately adjust the secondary medium temperature entering the secondary side 12 of the first heat exchanger and the primary medium temperature flowing out of the primary side 21 outlet of the second heat exchanger.

[0061] <Third Implementation Method>

[0062] The third embodiment of this application, which uses the same names and symbols as the embodiments described above, is the same content and will not be repeated here.

[0063] Figure 5 This is a schematic diagram of the refrigeration system provided in the third embodiment of this application, such as... Figure 3 As shown, this application also provides a refrigeration system 3, including a compressor 31, a condenser 32, a subcooler 33, an expansion valve 34 and an evaporator 35 connected in sequence by refrigerant pipes, wherein the connection relationship between the condenser 32 and the subcooler 33 constitutes the heat exchanger group 101 in any of the above embodiments, wherein the condenser 32 is the first heat exchanger 1 and the subcooler 33 is the second heat exchanger 2.

[0064] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A heat exchanger assembly, characterized in that, include: The first heat exchanger has a primary side and a secondary side. The secondary side inlet pipe of the first heat exchanger is connected to the first heat exchanger through the inlet of the secondary side of the first heat exchanger; The second heat exchanger has a primary side and a secondary side. The primary side inlet pipe of the second heat exchanger is connected at one end to the outlet of the primary side of the first heat exchanger and at the other end to the inlet of the primary side of the second heat exchanger. The secondary side inlet pipe of the second heat exchanger is connected at one end to the secondary side inlet pipe of the first heat exchanger and at the other end to the inlet of the secondary side of the second heat exchanger. The secondary side outlet pipe of the second heat exchanger is connected at one end to the inlet of the secondary side of the first heat exchanger and at the other end to the outlet of the secondary side of the second heat exchanger.

2. The heat exchanger assembly as described in claim 1, characterized in that, A water pump is installed on the secondary side inlet pipe or the secondary side outlet pipe of the second heat exchanger.

3. The heat exchanger assembly as described in claim 2, characterized in that, The medium in the primary side of the first heat exchanger flows in the opposite direction to the medium in the secondary side of the first heat exchanger; The medium in the primary side of the second heat exchanger flows in the opposite direction to the medium in the secondary side of the second heat exchanger.

4. The heat exchanger assembly as described in claim 3, characterized in that, The medium in the primary side of the first heat exchanger and the primary side of the second heat exchanger is a refrigerant; The medium in the secondary side of the first heat exchanger and the secondary side of the second heat exchanger is water.

5. The heat exchanger assembly as described in claim 4, characterized in that, The medium in the primary side of the first heat exchanger and the primary side of the second heat exchanger is a low-GWP refrigerant selected from any one of R515B, R513A or R1234ze.

6. The heat exchanger assembly as described in claim 5, characterized in that, The first heat exchanger is a flooded heat exchanger; The second heat exchanger is a plate heat exchanger.

7. The heat exchanger assembly as described in claim 6, characterized in that, It also includes, The primary side outlet pipe of the second heat exchanger is connected to the second heat exchanger through the outlet of the primary side of the second heat exchanger. The medium flowing out from the primary side outlet pipe of the second heat exchanger is a saturated liquid.

8. The heat exchanger assembly as described in claim 7, characterized in that, The water flow rate through the pump is less than 80% of the total water flow through the inlet of the secondary side of the first heat exchanger.

9. The heat exchanger assembly as claimed in claim 1, characterized in that, The first heat exchanger has a first inlet on the secondary side and a second inlet on the secondary side. The secondary side inlet pipe of the first heat exchanger is connected to the first inlet of the secondary side of the first heat exchanger; The outlet pipe of the second heat exchanger is connected to the second inlet of the second heat exchanger.

10. The heat exchanger assembly as claimed in claim 9, characterized in that, The first inlet on the secondary side of the first heat exchanger and the outlet on the secondary side of the first heat exchanger are respectively located at one end of the first heat exchanger. The second inlet on the secondary side of the first heat exchanger is located at the other end of the first heat exchanger.

11. A refrigeration system comprising a compressor, a condenser, a subcooler, an expansion valve, and an evaporator connected in sequence by refrigerant piping, characterized in that, The connection between the condenser and the subcooler constitutes a heat exchanger group as described in any one of claims 1-10, wherein the condenser is the first heat exchanger and the subcooler is the second heat exchanger.

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