Liquid cooling dehumidification unit

Abstract

The invention discloses a liquid cooling dehumidification unit and relates to the field of humidity control, the liquid cooling dehumidification unit comprises a second loop and a bypass branch, a compressor provides power for the second loop, a high-temperature refrigerant of an evaporator is conveyed to a condenser to dissipate heat and cool the outside, and the cooled refrigerant flows back to the evaporator; the bypass branch and the evaporator are arranged in parallel, and the refrigerant cooled by the condenser is divided into two paths to flow through the bypass branch and the evaporator respectively, so that the bypass heat exchanger and the evaporator form low temperature; the bypass heat exchanger and the condenser are arranged side by side, the second loop and the bypass branch share the same fan for heat dissipation, the fan guides airflow to pass through the bypass heat exchanger and the condenser respectively, high-temperature air formed after passing through the condenser is cooled by the bypass heat exchanger, and water vapor carried when the high-temperature air reaches the bypass heat exchanger is condensed into water drops. Condensation and dehumidification are achieved. And the second loop and the bypass branch share the same fan, so that structures and pipelines are reduced, and the space utilization rate is increased.

Description

Technical Field

[0001] The invention relates to the field of humidity control, and further to a liquid cooling dehumidification unit. Background Art

[0002] Renewable energy generation represented by wind and solar energy has low flexibility, and electrochemical energy storage is an ideal solution for achieving flexible power dispatch, so the scale of wind and solar energy storage has developed rapidly. The temperature of energy storage batteries is maintained at 25~45℃ during charging and discharging, and the performance is optimal. In order to meet the operating temperature of large-capacity energy storage batteries under different external ambient temperatures, it is necessary to provide corresponding liquid cooling thermal management solutions to cool and control the temperature of energy storage batteries.

[0003] In addition, the environment of wind and solar distribution storage is relatively harsh, and there is no lack of high salt fog environment, which brings challenges to electrical reliability, cost and life. The relative humidity of the air has a great influence on salt fog corrosion. Metals usually corrode very little when the relative humidity is below a certain level, and the temperature has little effect on the corrosion rate at this time; but when the relative humidity is above a certain level, the corrosion rate will increase rapidly, and as the temperature increases, the corrosion rate will accelerate.

[0004] Therefore, energy storage containers are usually equipped with chillers and dehumidifiers. In the process of implementing the invention of this application, the inventors found that there are at least the following problems in the prior art: the existing energy storage container heat dissipation system cannot achieve the dehumidification function when dissipating heat to the battery. However, an additional dehumidification system is set up separately, which makes the refrigeration and dehumidification components occupy a large space. Summary of the invention

[0005] The invention provides a liquid cooling dehumidification unit, which solves the problem that a battery heat dissipation and dehumidification component occupies a large space.

[0006] A liquid-cooled dehumidification unit comprises a second circuit and a bypass branch.

[0007] The second circuit includes the evaporator, a compressor, a condenser, and an expansion valve. The compressor is used to drive the refrigerant to transfer the heat from the evaporator to the condenser for cooling.

[0008] The bypass shunt includes a bypass heat exchanger and a bypass expansion valve. The bypass shunt is arranged in parallel with the evaporator. After the refrigerant is cooled by the condenser, it is divided into two paths after passing through the expansion valve and flows through the bypass shunt and the second channel of the evaporator respectively.

[0009] The bypass heat exchanger and the condenser are arranged along the direction of the airflow. The fan guides the airflow through the bypass heat exchanger and the condenser. At least part of the high-temperature airflow formed by the condenser passes through the bypass heat exchanger. The bypass heat exchanger cools the airflow passing through to achieve condensation and dehumidification.

[0010] Optionally, the condenser includes a plurality of tube-fin heat exchangers arranged side by side, and the bypass heat exchanger is arranged between the tube-fin heat exchangers.

[0011] Optionally, the number of the tube-fin heat exchangers located on the windward side of the bypass heat exchanger is greater than the number of the tube-fin heat exchangers located on the leeward side of the bypass heat exchanger.

[0012] Optionally, the tube-fin heat exchangers are connected in parallel with each other, and at least some of the tube-fin heat exchangers are provided with control valves, and the control valves are used to adjust the refrigerant flow corresponding to the tube-fin heat exchangers.

[0013] Optionally, the ventilation area of ​​the bypass heat exchanger is smaller than the ventilation area of ​​the condenser.

[0014] Optionally, the first circuit is further included, the first circuit includes a driving pump, an evaporator and a heat absorber, the evaporator includes a first channel and a second channel, the first channel is connected to the first circuit, and the second channel is connected to the second circuit;

[0015] The driving pump is used to drive the coolant to transfer heat from the heat absorber to the first channel of the evaporator, and to perform heat exchange in the evaporator, so that heat is transferred from the first channel to the second channel.

[0016] Optionally, the driving pump outlet pipe of the first circuit is provided with a liquid outlet temperature sensor;

[0017] The compressor inlet pipeline of the second circuit is provided with a suction temperature sensor and a suction pressure sensor;

[0018] A bypass pressure sensor is provided at the bypass heat exchanger outlet pipe of the bypass branch.

[0019] Optionally, the expansion valve and the bypass expansion valve are electronic expansion valves; the detection signals of the intake temperature sensor and the intake pressure sensor are used as feedback signals to adjust the opening of the expansion valve; the detection signal of the bypass pressure sensor is used as a feedback signal to adjust the opening of the bypass expansion valve.

[0020] Optionally, an airflow guiding duct is arranged at the periphery of the bypass heat exchanger and the condenser, and the airflow guiding duct is used to guide the external airflow to flow through the bypass heat exchanger and the condenser to achieve condensation and dehumidification.

[0021] Optionally, the airflow guiding air duct is provided with a three-way reversing valve, and the three-way reversing valve is used to switch the air intake from inside the cabinet or from outside the cabinet.

[0022] The present invention provides a liquid cooling dehumidification unit, including a second circuit and a bypass branch, a compressor provides power for the second circuit, a high-temperature refrigerant of the evaporator is transported to the condenser to dissipate heat and cool down to the outside, and the cooled refrigerant flows back to the evaporator; the bypass branch is arranged in parallel with the evaporator, and the refrigerant cooled by the condenser is divided into two paths and flows through the bypass branch and the evaporator respectively, so that the bypass heat exchanger and the evaporator form a low temperature; the bypass heat exchanger and the condenser are arranged side by side, and the second circuit and the bypass branch share the same fan for heat dissipation, and the fan guides the airflow to pass through the bypass heat exchanger and the condenser respectively, and the high-temperature air formed after passing through the condenser is cooled down by the bypass heat exchanger, and the water vapor carried by the high-temperature air when it reaches the bypass heat exchanger condenses into water droplets, so as to realize condensation dehumidification. The second circuit and the bypass branch share the same fan, which reduces the structure and pipelines and improves the space utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a system schematic diagram of the liquid-cooled dehumidification unit of the present invention;

[0025] Figure 2 To highlight the system schematic diagram of the first circuit;

[0026] Figure 3 To highlight the system schematic diagram of the second circuit;

[0027] Figure 4 To highlight the system schematic diagram of the bypass branch;

[0028] Figure 5 Schematic diagram of the coordination between the condenser and the bypass heat exchanger.

[0029] The figure includes:

[0030] Driving pump 1, evaporator 2, heat absorber 3, compressor 4, condenser 5, expansion valve 6, bypass heat exchanger 7, bypass expansion valve 8, fan 9;

[0031] Liquid outlet temperature sensor 101 , intake air temperature sensor 102 , intake air pressure sensor 103 , bypass pressure sensor 104 . DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solution of the present invention, the liquid-cooled dehumidification unit of the present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] Combination Figure 1 As shown, the arrows in the figure indicate the flow direction of the medium; the present invention provides a liquid-cooled dehumidification unit, including a second circuit and a bypass branch, the second circuit and the bypass branch respectively have pipelines and related devices, the devices are connected to the pipelines, and the pipelines and the devices are used to circulate the medium.

[0034] Combination Figure 3 As shown, the second circuit includes an evaporator 2, a compressor 4, a condenser 5 and an expansion valve 6, which are connected in series on a pipeline. The compressor 4 is used to drive the refrigerant to circulate between the evaporator 2 and the condenser 5, and is used to transport the high-temperature refrigerant of the evaporator 2 to the condenser 5 to dissipate heat to the outside. The outside here is relative to the condenser 5, and the outside of the condenser 5 is the outside here. The refrigerant after heat dissipation and cooling flows back to the evaporator 2, and circulates in this way.

[0035] Combination Figure 4 As shown, the bypass shunt includes a bypass heat exchanger 7 and a bypass expansion valve 8, and the bypass heat exchanger 7 and the bypass expansion valve 8 are sequentially connected in series on the pipeline. The bypass shunt is arranged in parallel with the evaporator 2, that is, the bypass heat exchanger 7 and the bypass expansion valve 8 are both connected in parallel with the evaporator 2, and the refrigerant flowing through the bypass heat exchanger 7 and the bypass expansion valve 8 is independent of the refrigerant flowing through the evaporator 2, and is two parallel pipelines. The refrigerant cooled by the condenser 5 is divided into two paths after passing through the expansion valve 6, and flows through the bypass shunt and the evaporator 2 respectively, that is, after the refrigerant flows out of the expansion valve 6, one path flows to the bypass expansion valve 8 and the bypass heat exchanger 7, and the other path flows to the evaporator 2. The refrigerant flowing out of the bypass heat exchanger 7 and the refrigerant flowing out of the evaporator 2 merge and flow back to the condenser 5.

[0036] The bypass heat exchanger 7 and the condenser 5 are arranged side by side, and the bypass heat exchanger 7 and the condenser 5 are arranged in the direction of the airflow. The fan 9 is an independent pipeline structure, which is used to guide the airflow. The fan 9 guides the airflow to pass through the bypass heat exchanger 7 and the condenser 5 respectively. When the airflow passes through the condenser 5 first, it absorbs the heat of the refrigerant in the condenser 5, and the temperature of the air increases; the high-temperature air then passes through the bypass heat exchanger 7, and is cooled by the bypass heat exchanger 7, and condensation and dehumidification are achieved with the help of the bypass heat exchanger 7.

[0037] The expansion valve is an important component in the refrigeration system. The expansion valve allows the medium-temperature and high-pressure liquid refrigerant to become low-temperature and low-pressure wet steam through its throttling, and then the refrigerant absorbs heat to achieve the refrigeration effect. In the second circuit, when the refrigerant flows through the expansion valve 6, a cooling and pressure reduction process is realized. Part of the refrigerant flows to the evaporator 2 to absorb heat, and the other part of the refrigerant flows to the bypass expansion valve 8 for the second cooling and pressure reduction process. The temperature of the refrigerant flowing out of the bypass expansion valve 8 is further reduced, so the temperature of the refrigerant flowing into the bypass heat exchanger 7 is lower than the temperature of the refrigerant flowing to the evaporator 2; the refrigerant temperature of the bypass heat exchanger 7 is lower, so that the air passing through the bypass heat exchanger 7 reaches the dew point temperature, realizing the condensation of moisture in the air.

[0038] In the liquid-cooled dehumidification unit of the present invention, the bypass heat exchanger 7 and the condenser 5 are combined, and the two share the same fan 9 to generate airflow, which can reduce one fan, simplify the structure, and improve space utilization. The liquid-cooled dehumidification unit of the present invention not only realizes the heat dissipation of the heat absorber 3, but also reduces the humidity in the air. The liquid-cooled dehumidification unit of the present invention is used in the box of the energy storage device, which can not only dissipate heat, but also reduce humidity, realizes dual function integration, and improves space utilization.

[0039] The driving pump 1 of the present invention is a water pump, which is used to drive the flow of liquid coolant, and there is no need to use a phase-changing medium to dissipate heat in the first circuit. The compressor 4 is used to drive the flow of the refrigerant of the phase-changing medium, and the second circuit uses a phase-changing medium to dissipate heat. The compressor is a fluid machine that lifts low-pressure gas to high-pressure gas. The compressor inhales low-temperature and low-pressure refrigerant gas, compresses it through the operation of the motor to drive the piston, and then discharges high-temperature and high-pressure refrigerant gas to the exhaust pipe, providing power for the refrigeration cycle.

[0040] The condenser 5 of the present invention includes a plurality of tube-fin heat exchangers arranged side by side. The arrangement of the plurality of tube-fin heat exchangers can increase the contact area with the ambient air, so that the condenser 5 has a larger heat dissipation area. The bypass heat exchanger 7 is arranged between the tube-fin heat exchangers, that is, there are tube-fin heat exchangers on the windward side (front side) and the leeward side (rear side) of the bypass heat exchanger 7. The airflow blowing from the front side is heated by passing through a part of the tube-fin heat exchanger, and condenses into water droplets when it reaches the dew point temperature through the bypass heat exchanger 7. The dry and low-temperature air continues to flow to the rear side and reaches the tube-fin heat exchanger on the leeward side of the bypass heat exchanger 7, and the air is heated again; the air generally experiences a cooling and a heating, so as to avoid the temperature of the air discharged at the end being too low, so as to prevent other devices from undergoing a sharp temperature change and maintain the stability of the working temperature of other devices.

[0041] The fin-and-tube heat exchangers of the condenser 5 are arranged in multiple rows, and the bypass heat exchanger 7 is arranged between the rows of the fin-and-tube heat exchangers, which not only ensures a certain condensing load as the heat load of the bypass heat exchanger 7 to avoid excessive liquid return in the bypass branch, but also ensures that the outlet air temperature after passing through the bypass heat exchanger 7 (close to the dew point temperature) and then passing through the condenser 5 is increased to ensure the use of low-temperature conditions.

[0042] Furthermore, the number of the tube-fin heat exchangers on the windward side of the bypass heat exchanger 7 is greater than the number of the tube-fin heat exchangers on the leeward side of the bypass heat exchanger 7. Figure 5 As shown, the airflow flows from left to right, the left is the front side, the right is the rear side, three tube-fin heat exchangers are arranged on the front side, and one tube-fin heat exchanger is arranged on the rear side. The tube-fin heat exchanger on the front side has a larger contact area, and releases heat to the air in a concentrated manner, so that the air temperature rises higher. When the air passes through the bypass heat exchanger 7, the temperature drops sharply, and then when it passes through the fewer tube-fin heat exchangers on the rear side, the air temperature rises slightly, so that the air returns to a suitable temperature.

[0043] In an optional embodiment, each tube-fin heat exchanger is connected in parallel with each other, and at least some of the tube-fin heat exchangers are provided with control valves, that is, all or part of the tube-fin heat exchangers are provided with control valves, and the control valves are used to adjust the refrigerant flow of the corresponding tube-fin heat exchanger. The flow of each tube-fin heat exchanger can be adjusted separately, thereby adjusting the ratio of heat dissipated before and after the bypass heat exchanger 7.

[0044] Combination Figure 1 , Figure 5 As shown, the ventilation area of ​​the bypass heat exchanger 7 is smaller than that of the tube-fin heat exchanger. The ventilation area is also the projection area perpendicular to the airflow direction. The projection of the bypass heat exchanger 7 in the airflow direction completely falls within the range of the tube-fin heat exchanger. The internal volume of the bypass heat exchanger 7 is smaller than that of the condenser 5. Only a small amount of refrigerant is needed to reduce the bypass heat exchanger 7 to a lower temperature.

[0045] Based on any of the above schemes and their combinations, the evaporator 2 includes a first channel and a second channel, the first channel and the second channel are used for conducting heat, a heat conduction structure is arranged between the first channel and the second channel, the high-temperature medium flowing into the first channel conducts heat to the low-temperature medium flowing into the second channel, the temperature of the medium flowing out of the first channel decreases, and the temperature of the medium flowing out of the second channel increases. The evaporator 2 can adopt a plate-fin heat exchanger, and conducts heat between the first channel and the second channel through a plurality of fins.

[0046] Combination Figure 2As shown, the liquid cooling dehumidification unit of the present invention also includes a first circuit, which includes a driving pump 1, an evaporator 2 and a heat absorber 3. The driving pump 1, the evaporator 2 and the heat absorber 3 are connected in series on the pipeline, and the coolant in the driving pump 1, the evaporator 2 and the heat absorber 3 can circulate in the pipeline of the first circuit. The driving pump 1 provides driving force for the first circuit, so that the internal coolant generates the power to flow, the high-temperature coolant discharged from the heat absorber 3 is transferred to the evaporator 2 for heat dissipation, and the cooled coolant is returned to the heat absorber 3. The driving pump 1 is used to drive the coolant to circulate between the first channel of the evaporator 2 and the heat absorber 3, and the coolant exchanges heat between the evaporator 2 and the heat absorber 3; the coolant absorbs heat at the heat absorber 3 to increase the temperature, and the heated coolant flows to the first channel of the evaporator 2, and the coolant releases heat in the first channel of the evaporator 2 to decrease the temperature, and the cooled coolant flows to the heat absorber 3, thereby forming a continuous circulation flow.

[0047] The coolant transfers heat from the heat absorber 3 to the evaporator 2. The heat absorber 3 in the present invention contacts the heat source and transfers the heat emitted by the heat source to the coolant. When the liquid-cooled dehumidification unit of the present invention is applied to electrochemical energy storage, the heat source is a battery module, and the heat of the battery module is transferred to the evaporator 2 through the heat absorber 3.

[0048] The first circuit transfers the heat of the battery module to the first channel of the evaporator 2, and the heat enters the second circuit through the heat exchange between the first channel and the second channel; the refrigerant in the second circuit is cooled by the condenser 5, and then flows to the bypass branch and the second channel of the evaporator 2 after passing through the expansion valve 6. After passing through the bypass expansion valve 8 in the bypass branch, the temperature is further reduced, so that the bypass heat exchanger 7 reaches the dew point temperature, which can quickly cool down and condense the hot air passing through the condenser 5 to remove the moisture in the air. By repeating this process continuously, the battery module can be cooled down and the moisture content in the air can be reduced.

[0049] Combination Figure 1 As shown, the outlet pipe of the driving pump 1 of the first circuit of the present invention is provided with an outlet temperature sensor 101 for detecting the temperature of the coolant discharged from the driving pump 1. The inlet pipe of the compressor 4 of the second circuit is provided with a suction temperature sensor 102 and a suction pressure sensor 103 for detecting the temperature and pressure of the refrigerant before entering the compressor 4. The outlet pipe of the bypass heat exchanger 7 of the bypass shunt is provided with a bypass pressure sensor 104 for detecting the pressure of the refrigerant discharged from the bypass heat exchanger 7.

[0050] The expansion valve 6 and bypass expansion valve 8 of the present invention are both electronic expansion valves, which are controlled by the suction temperature and low pressure to control the suction superheat and avoid liquid return of the compressor. The detection signals of the suction temperature sensor 102 and the suction pressure sensor 103 are used as feedback signals to adjust the opening of the expansion valve 6; the detection pressure of the bypass pressure sensor 104 is used as a feedback signal to control the opening of the bypass expansion valve 8. The bypass pressure is used as a feedback signal to control the opening of the bypass expansion valve 8, realize the control of the evaporation pressure of the bypass heat exchanger 7, reduce the temperature of the air passing through the bypass heat exchanger 7 to the dew point temperature, and achieve the purpose of condensation and dehumidification. The compressor speed is controlled by the outlet water temperature, and the minimum speed is set to ensure that the compressor does not stop and maintain the dehumidification function.

[0051] In an optional embodiment, the liquid-cooled dehumidification unit of the present invention is installed in a cabinet, an airflow guiding duct is installed in the cabinet, an airflow guiding duct is arranged around the outer periphery of the bypass heat exchanger 7 and the condenser 5, the bypass heat exchanger 7 and the condenser 5 are arranged in the airflow guiding duct, and one end of the airflow guiding duct is connected to the air outside the cabinet for introducing air into the cabinet. The airflow guiding duct is used to guide the outside airflow to flow through the bypass heat exchanger 7 and the condenser 5 to achieve condensation and dehumidification. The outside here refers to the outside of the cabinet, that is, before the outside air enters the cabinet, it first passes through the bypass heat exchanger 7 and the condenser 5 for dehumidification, which can reduce the humidity of the air entering the cabinet.

[0052] The airflow guiding air duct of the present invention is provided with a three-way reversing valve, and the three-way reversing valve is used to switch the air intake from the cabinet or from the outside of the cabinet. When the three-way reversing valve is used to switch the air intake from the cabinet, the air in the cabinet circulates continuously, and continuously passes through the bypass heat exchanger 7 and the condenser 5 for dehumidification; if the air in the cabinet continues to circulate, it will cause the temperature in the cabinet to continue to rise, which is not conducive to the heat dissipation of the device, and it is necessary to switch to the air intake outside the cabinet, replace part of the air in the cabinet, and introduce fresh air from the outside. If the external ambient temperature is low, the air can be circulated in the cabinet.

[0053] The liquid cooling dehumidifier unit of the present invention is a heat dissipation cooling and dehumidification integrated machine, which improves space utilization. It recovers waste heat, increases the dehumidification temperature, and reduces people's discomfort with the waste heat exhaust area. The present invention will shorten the compressor downtime and improve the water temperature responsiveness.

[0054] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A liquid-cooled dehumidification unit, characterized in that: Including the second circuit and bypass branch, The second circuit comprises the evaporator (2), a compressor (4), a condenser (5), and an expansion valve (6); the compressor (4) is used to drive the refrigerant to transfer heat from the evaporator (2) to the condenser (5) for cooling; The bypass branch comprises a bypass heat exchanger (7) and a bypass expansion valve (8), the bypass branch is arranged in parallel with the evaporator (2), and the refrigerant after being cooled by the condenser (5) passes through the expansion valve (6) and is divided into two paths, respectively flowing through the bypass branch and the second channel of the evaporator (2); The bypass heat exchanger (7) and the condenser (5) are arranged in an array along the direction of the airflow. The fan (9) guides the airflow to pass through the bypass heat exchanger (7) and the condenser (5). At least part of the high-temperature airflow formed by passing through the condenser (5) passes through the bypass heat exchanger (7). The bypass heat exchanger (7) cools the airflow passing through the bypass heat exchanger, thereby achieving condensation and dehumidification.

2. The liquid-cooled dehumidification unit according to claim 1, characterized in that: The condenser (5) comprises a plurality of tube-fin heat exchangers arranged side by side, and the bypass heat exchanger (7) is arranged between the tube-fin heat exchangers.

3. The liquid-cooled dehumidification unit according to claim 2, characterized in that: The number of the tube-fin heat exchangers located on the windward side of the bypass heat exchanger (7) is greater than the number of the tube-fin heat exchangers located on the leeward side of the bypass heat exchanger (7).

4. The liquid cooling dehumidification unit according to claim 2, characterized in that: The tube-fin heat exchangers are connected in parallel with each other, and at least some of the tube-fin heat exchangers are provided with control valves, and the control valves are used to adjust the refrigerant flow corresponding to the tube-fin heat exchangers.

5. The liquid-cooled dehumidification unit according to claim 2, characterized in that: The ventilation area of ​​the bypass heat exchanger (7) is smaller than the ventilation area of ​​the condenser (5).

6. The liquid-cooled dehumidification unit according to any one of claims 1 to 5, characterized in that: It also includes a first circuit, the first circuit includes a driving pump (1), an evaporator (2) and a heat absorber (3), the evaporator (2) includes a first channel and a second channel, the first channel is connected to the first circuit, and the second channel is connected to the second circuit; The driving pump (1) is used to drive the coolant to transfer heat from the heat absorber (3) to the first channel of the evaporator (2), and to perform heat exchange in the evaporator (2), so that heat is transferred from the first channel to the second channel.

7. The liquid cooling dehumidification unit according to claim 6, characterized in that: The outlet pipe of the driving pump (1) of the first circuit is provided with a liquid outlet temperature sensor (101); An inlet pipe of the compressor (4) of the second circuit is provided with an intake air temperature sensor (102) and an intake air pressure sensor (103); A bypass pressure sensor (104) is provided at the outlet pipe of the bypass heat exchanger (7) of the bypass branch.

8. The liquid cooling dehumidification unit according to claim 7, characterized in that: The expansion valve (6) and the bypass expansion valve (8) are electronic expansion valves; detection signals of the intake temperature sensor (102) and the intake pressure sensor (103) are used as feedback signals to adjust the opening of the expansion valve (6); and detection signals of the bypass pressure sensor (104) are used as feedback signals to adjust the opening of the bypass expansion valve (8).

9. The liquid cooling dehumidification unit according to claim 5, characterized in that: An airflow guiding duct is arranged on the periphery of the bypass heat exchanger (7) and the condenser (5), and the airflow guiding duct is used to guide the external airflow to flow through the bypass heat exchanger (7) and the condenser (5) to achieve condensation and dehumidification.

10. The liquid cooling dehumidification unit according to claim 9, characterized in that: The airflow guiding air duct is provided with a three-way reversing valve, and the three-way reversing valve is used to switch the air intake from inside the cabinet or from outside the cabinet.

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