A reinforced heat exchange channel structure based on M cycle and a heat exchanger

Abstract

The application firstly provides a reinforced heat exchange channel structure based on M cycle, which comprises a heat insulation shell with two open ends, a heat conduction plate parallel to the bottom wall of the heat insulation shell is arranged in the heat insulation shell, the heat conduction plate divides the heat insulation shell into two channels, the dry channel is arranged below the heat conduction plate, the wet channel is arranged above the heat conduction plate, a flow distribution area is arranged on the side of the heat insulation shell, where the outlet of the dry channel and the inlet of the wet channel are located, a water film is arranged on one side of the heat conduction plate, which is located in the wet channel, a plurality of upper grooves parallel to each other are arranged on one side of the heat conduction plate, which is located in the dry channel, a plurality of lower grooves corresponding to the upper grooves are arranged on one side of the bottom wall of the heat insulation shell, which is located in the dry channel, and the upper grooves and the lower grooves are arranged along the direction perpendicular to the length direction of the dry channel. Compared with the traditional M-cycle, the cooling is faster and the cooling amplitude is larger. The application further provides a heat exchanger.

Description

Technical Field

[0001] This invention relates to the field of evaporative refrigeration equipment technology, and more specifically, to an enhanced heat exchange channel structure and heat exchanger based on the M-cycle. Background Technology

[0002] Counter-current dew point indirect evaporative cooling technology (M-cycle) is a type of indirect evaporative refrigeration technology. Compared with direct evaporative refrigeration and traditional indirect evaporative refrigeration, it has many advantages, such as high cooling efficiency, the ability to cool to below the wet-bulb temperature and close to the dew point temperature, and no change in the air moisture content during the cooling process. Since its inception, it has spawned various heat exchange structures, which can be summarized into the following two types, as shown in the appendix. Figure 1a The traditional M-cycle and the improved M-cycle shown are attached. Figure 1b The improved M-cycle shown is theoretically closer to the dew point temperature than the traditional M-cycle, but its lower cooling capacity per unit volume results in lower integration. Therefore, based on the principle of the traditional M-cycle, the cooling effect can be improved by optimizing the airflow pattern and enhancing the heat transfer efficiency of the channel plate. Currently, the main methods to improve the cooling effect of the traditional M-cycle are changing the arrangement of the heat exchange channels and the type of material used for the heat exchange channel plates. Methods that influence the heat transfer effect of the traditional M-cycle by changing the processing method or surface structure of the heat exchange plates have not yet been effectively explored.

[0003] Therefore, the existing M-cycle heat exchange channel structure still needs improvement. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide an enhanced heat transfer channel structure and heat exchanger based on the M-cycle. By setting opposite grooves on the upper and lower sides of the dry channel, not only can the contact area with the airflow be increased, but also the convective heat transfer can be enhanced, and the negative impact of the high-speed airflow in the center of the dry channel can be weakened to achieve the purpose of enhancing heat transfer. Compared with the traditional M-cycle, the cooling is faster and the cooling range is greater.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention first proposes an enhanced heat exchange channel structure based on the M-cycle, including a heat-insulating shell with openings at both ends. Inside the heat-insulating shell, there is a heat-conducting plate parallel to the bottom wall of the heat-insulating shell. The heat-conducting plate divides the interior of the heat-insulating shell into upper and lower channels. The channel below the heat-conducting plate is a dry channel, and the channel above the heat-conducting plate is a wet channel. A flow-diverting zone is provided on one side of the heat-insulating shell where the dry channel outlet and the wet channel inlet are located. A water film is provided on the heat-conducting plate on one side of the wet channel.

[0007] The heat-conducting plate is provided with a plurality of parallel upper grooves on one side of the dry channel, and the bottom wall of the heat insulation shell is provided with lower grooves on one side of the dry channel, which are arranged opposite to the upper grooves and correspond one-to-one. The upper grooves and lower grooves are arranged along the direction perpendicular to the length of the dry channel.

[0008] Furthermore, both the upper and lower grooves are rectangular grooves.

[0009] Furthermore, a water film is provided on the top wall of the heat-insulating outer shell on one side of the dry channel.

[0010] The present invention also proposes a heat exchanger, comprising a heat exchanger shell with openings at both ends, a refrigeration module disposed inside the heat exchanger shell, the refrigeration module comprising a plurality of enhanced heat exchange channel structures as described above, stacked vertically, the heat exchanger having a dry channel inlet and a dry channel outlet at both ends, a wet channel outlet on the heat exchanger shell, the dry channel inlet and dry channel outlet being connected to the dry channel, the wet channel outlet being connected to the wet channel, and a fan being connected to the dry channel inlet and wet channel outlet respectively.

[0011] Furthermore, the heat exchanger housing is provided with a dry channel inlet adapter.

[0012] Furthermore, the dry channel inlet adapter is equipped with a dry channel inlet fan connector.

[0013] Furthermore, the heat exchanger housing is provided with a dry channel outlet adapter.

[0014] Furthermore, the dry channel outlet adapter is equipped with a dry channel outlet fan connector.

[0015] Furthermore, the heat exchanger housing is provided with a wet channel outlet adapter.

[0016] Furthermore, a water tank is provided inside the heat exchanger shell, and one end of the water film extends into the water tank.

[0017] The beneficial effects of this invention are as follows:

[0018] The enhanced heat transfer channel structure based on the M-cycle of this invention, by setting opposite grooves on the upper and lower sides of the dry channel, causes boundary layer separation at the location of the grooves when the airflow passes through the dry channel, achieving the technical purpose of secondary airflow between the grooves. This results in a larger convective heat transfer coefficient on the surface of the grooves, which not only increases the contact area with the airflow, but also enhances convective heat transfer and weakens the negative impact of the high-speed airflow in the center of the dry channel to achieve the purpose of enhanced heat transfer. Compared with the traditional M-cycle, it cools down faster and with a greater cooling range.

[0019] The heat exchanger of the present invention, by stacking and arranging a reinforced heat exchange channel structure in the upper and lower layers inside the heat exchanger shell, can make the heat exchange between different channels more complete and reduce the impact of the external high temperature environment on the internal heat exchange.

[0020] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0021] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration:

[0022] Figure 1a This is a schematic diagram of a traditional M-cycle heat exchange channel structure.

[0023] Figure 1b A schematic diagram of the improved M-cycle heat exchange channel structure;

[0024] Figure 2 This is a schematic diagram of the internal structure of an embodiment of the enhanced heat exchange channel structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of an embodiment of the heat exchanger of the present invention;

[0026] Figure 4 This is a schematic diagram of the internal structure of an embodiment of the heat exchanger of the present invention;

[0027] Figure 5 This is a schematic diagram of the M-loop principle.

[0028] Figure 6 This is a schematic diagram of the temperature change in the dry channel of a conventional M-cycle heat exchange channel structure.

[0029] Figure 7 This is a schematic diagram of the temperature change in the dry channel of the enhanced heat exchange channel structure of the present invention.

[0030] Figure 8 The simulated cooling rate is for a conventional M-cycle heat exchange channel structure;

[0031] Figure 9 The simulated cooling range of the enhanced heat exchange channel structure of this invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1-Insulated outer shell; 2-Heat conduction plate; 3-Dry channel; 4-Wet channel; 5-Diversion zone; 6-Water film; 7-Upper groove; 8-Lower groove; 9-Heat exchanger shell; 10-Dry channel inlet adapter; 11-Dry channel inlet fan connector; 12-Dry channel outlet adapter; 13-Dry channel outlet fan connector; 14-Wet channel outlet adapter; 15-Water tank. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0035] Example 1 - Enhanced heat transfer channel structure based on M-cycle

[0036] like Figure 2 As shown in the figure, the present invention first proposes an enhanced heat exchange channel structure based on M-cycle, including a heat-insulating shell 1 with openings at both ends. A heat-conducting plate 2 parallel to the bottom wall of the heat-insulating shell 1 is provided inside the heat-insulating shell 1. In this embodiment, the heat-conducting plate 2 is made of aluminum. The heat-conducting plate 2 divides the interior of the heat-insulating shell 1 into two channels, an upper and a lower channel. The channel below the heat-conducting plate 2 is a dry channel 3, and the channel above the heat-conducting plate 2 is a wet channel 4. A diversion zone 5 is provided on the side of the dry channel outlet and the wet channel 4 in the heat-insulating shell 1. In this embodiment, a baffle is provided on the side of the heat-insulating shell 1 at the outlet end of the dry channel 3 to facilitate the formation of the diversion zone 5. A water film 6 is provided on the side of the heat-conducting plate 2 at the wet channel 4. A water film 6 is also provided on the top wall of the heat-insulating shell 1 on the side of the dry channel 3, which can enhance the cooling effect of the device.

[0037] The heat-conducting plate 2 is provided with a plurality of parallel upper grooves 7 on one side of the dry channel 3. The bottom wall of the heat insulation shell 1 is provided with lower grooves 8 on one side of the dry channel 3, which are arranged opposite to the upper grooves 7 and correspond one-to-one. The upper grooves 7 and lower grooves 8 are arranged along the length direction perpendicular to the dry channel 3. In this embodiment, both the upper grooves 7 and lower grooves 8 are rectangular grooves.

[0038] Figure 5The diagram illustrates the principle of the M-cycle, with the following working process: Hot air (dry air) with low water vapor content in the environment is blown in by a fan from the dry channel inlet. At the splitting zone at the end of the dry channel, a portion flows counter-currently into the wet channel. The wet and dry channels are separated by a thermally conductive material, the surface of which is covered by a water film. As the dry air flows counter-currently into the wet channel, the difference in water vapor concentration causes moisture on the water film surface to diffuse (evaporate) into the dry air. The energy required for evaporation is the latent heat of water, derived from the internal energy of the water, thus lowering the temperature of the water film. To maintain energy stability within the wet channel and compensate for the latent heat loss due to evaporation, some energy is transferred through the thermally conductive material from the dry channel to the wet channel, causing the dry channel temperature to decrease. As the dry air flows counter-currently in the wet channel, promoting evaporation, its water vapor content increases, gradually becoming saturated humid air. Simultaneously, evaporation weakens, and the temperature in the wet channel becomes increasingly closer to the temperature of the dry air in the environment. After the counter-current process in the wet passage is completed, the humid air (working air) is blown out from the wet passage outlet by the fan. The evaporation process in the wet passage and the cooling process in the dry passage are carried out simultaneously, causing the airflow to decrease in temperature along the dry passage and become cold air. The cold air (product air) that does not enter the wet passage through counter-current flow flows out from the dry passage outlet.

[0039] In this embodiment, the enhanced heat exchange channel structure utilizes opposing grooves on the upper and lower sides of the dry channel during cooling. As airflow passes through the dry channel, boundary layer separation occurs at the groove locations, enabling secondary airflow between the grooves. This results in a larger convective heat transfer coefficient on the groove surface, increasing the contact area with the airflow and enhancing convective heat transfer. It also mitigates the negative impact of the high-speed airflow in the center of the dry channel, thus enhancing heat transfer. Compared to the traditional M-cycle, this results in faster and greater cooling. Figure 6-9 As shown in the simulation test conducted under the same intake conditions, same channel length, and same channel height, the heat exchange channel structure of this embodiment further reduces the product airflow by 2 degrees compared to the conventional M-cycle. Furthermore, compared to the improved M-cycle, it has higher integration, a simpler structure, and is easier to manufacture.

[0040] Example 2 - Heat Exchanger

[0041] like Figure 3 and Figure 4As shown, the present invention also proposes a heat exchanger, including a heat exchanger shell 9 with openings at both ends. A refrigeration module is housed inside the heat exchanger shell 9. The refrigeration module includes multiple reinforced heat exchange channel structures as described in Embodiment 1, stacked vertically. The heat exchanger has a dry channel inlet and a dry channel outlet at both ends, and a wet channel outlet on the heat exchanger shell 9. Both the dry channel inlet and dry channel outlet are connected to a dry channel 3, and the wet channel outlet is connected to a wet channel 4. Fans are connected to both the dry channel inlet and wet channel outlet. A dry channel inlet adapter 10 is provided on the heat exchanger shell 9, and a dry channel inlet fan connector 11 is provided on the dry channel inlet adapter 10. A dry channel outlet adapter 12 is provided on the heat exchanger shell 9, and a dry channel outlet fan connector 13 is provided on the dry channel outlet adapter 12. A wet channel outlet adapter 14 is provided on the heat exchanger shell 9. These adapters facilitate the connection of various components. A water tank 15 is provided inside the heat exchanger shell 9. One end of the water film 6 extends into the water tank 15 to facilitate continuous replenishment of water to the water film 6. In this embodiment, the water film 6 is formed by natural fibers absorbing water and adhering to the outer wall of the heat conduction plate 2 and the top wall of the heat insulation shell 1.

[0042] The refrigerator in this embodiment features a reinforced heat exchange channel structure stacked vertically within the heat exchanger shell. This multi-stage, symmetrically stacked cooling channel structure ensures more efficient heat exchange between different channels and reduces the impact of high external temperatures on internal heat exchange. Furthermore, this invention employs a direct-flow air duct design with fans installed at the dry channel inlet and outlet to promote counter-current airflow evaporation and heat absorption. This maintains the heat exchanger's cooling effect consistent with the model while reducing its size and increasing integration.

[0043] The above-described embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention. The scope of protection of the present invention is defined by the claims.

Claims

1. A heat transfer channel structure based on an M-cycle, characterized in that: The device includes a heat-insulating shell (1) with openings at both ends. The heat-insulating shell (1) is provided with a heat-conducting plate (2) parallel to the bottom wall of the heat-insulating shell (1). The heat-conducting plate (2) divides the interior of the heat-insulating shell (1) into two channels, an upper and a lower channel. The channel below the heat-conducting plate (2) is a dry channel (3), and the channel above the heat-conducting plate (2) is a wet channel (4). The heat-insulating shell (1) is provided with a diversion area (5) on one side where the outlet of the dry channel (3) and the inlet of the wet channel (4) are located. A water film (6) is provided on one side of the heat-conducting plate (2) on the wet channel (4). The heat-conducting plate (2) is provided with a plurality of parallel upper grooves (7) on one side of the dry channel (3). The bottom wall of the heat insulation shell (1) is provided with lower grooves (8) on one side of the dry channel (3) and are arranged opposite to the upper grooves (7) and correspond one-to-one. The upper grooves (7) and lower grooves (8) are arranged along the length direction perpendicular to the dry channel (3), and the upper grooves (7) and lower grooves (8) are both rectangular grooves. The upper grooves (7) and lower grooves (8) work together to cause the air flowing through the dry channel (3) to generate boundary layer separation and secondary flow, so as to enhance convective heat transfer.

2. The enhanced heat transfer channel structure based on the M-cycle according to claim 1, characterized in that: The top wall of the heat insulation shell (1) is provided with a water film (6) on one side of the dry channel (3).

3. A heat exchanger, characterized in that: The heat exchanger includes a heat exchanger shell (9) with openings at both ends. A refrigeration module is provided inside the heat exchanger shell (9). The refrigeration module includes multiple enhanced heat exchange channels based on the M-cycle as described in claim 1 or 2, which are stacked on top of each other. The heat exchanger has a dry channel inlet and a dry channel outlet at both ends. A wet channel outlet is provided on the heat exchanger shell (9). The dry channel inlet and dry channel outlet are both connected to the dry channel (3). The wet channel outlet is connected to the wet channel (4). A fan is connected to the dry channel inlet and the wet channel outlet respectively.

4. The heat exchanger according to claim 3, characterized in that: The heat exchanger housing (9) is provided with a dry channel inlet adapter (10).

5. The heat exchanger according to claim 4, characterized in that: The dry channel inlet adapter (10) is equipped with a dry channel inlet fan connector (11).

6. The heat exchanger according to claim 3, characterized in that: The heat exchanger shell (9) is provided with a dry channel outlet adapter (12).

7. The heat exchanger according to claim 6, characterized in that: The dry channel outlet adapter (12) is equipped with a dry channel outlet fan connector (13).

8. The heat exchanger according to claim 3, characterized in that: The heat exchanger housing (9) is provided with a wet channel outlet adapter (14).

9. The heat exchanger according to claim 3, characterized in that: The heat exchanger housing (9) is provided with a water tank (15), and one end of the water film (6) extends into the water tank (15).

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