Liquid-cooled dehumidifying unit

Abstract

The application discloses a liquid cooling dehumidification unit, and relates to the field of humidity control, which comprises a second loop and a bypass branch. The compressor provides power for the second loop. High-temperature refrigerant of the evaporator is delivered to the condenser to radiate heat to the outside world, and the cooled refrigerant flows back to the evaporator. The bypass branch is arranged in parallel with the evaporator. 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 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. The high-temperature air formed after passing through the condenser is cooled by the bypass heat exchanger. The water vapor carried by the high-temperature air condenses into water droplets when the high-temperature air reaches the bypass heat exchanger, so that condensation dehumidification is realized. The second loop and the bypass branch share the same fan, so that the structure and the pipeline are reduced, and the space utilization is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of humidity control, and further relates to a liquid-cooled dehumidification unit. BACKGROUND

[0002] Wind energy and solar energy, as representatives of renewable energy, have low flexibility, and electrochemical energy storage is an ideal solution for flexible power scheduling, so the scale of wind, light and storage is rapidly developing. The performance of the energy storage battery is optimal when the temperature is maintained at 25-45 DEG C during charging and discharging. In order to meet the operating temperature of large-capacity energy storage batteries in different external environment temperatures, a corresponding liquid cooling thermal management solution is needed to cool and control the temperature of the energy storage battery.

[0003] In addition, the environment of wind, light and storage is relatively harsh, and there are high salt mist environments, which challenge the electrical reliability, cost and life. The relative humidity of air has a great influence on salt mist corrosion. The metal corrosion is very low when the relative humidity is below a certain value, and the temperature has little effect on the corrosion rate at this time. However, when the relative humidity is higher than a certain value, the corrosion rate will increase rapidly, and the corrosion rate will increase with the increase of temperature.

[0004] Therefore, the energy storage container usually configures a water chiller and a dehumidification unit. In the process of realizing the present application, the inventors found that at least the following problems exist in the prior art: the existing energy storage container heat dissipation system cannot realize dehumidification when dissipating heat for the battery. However, the additional separate dehumidification system occupies a large space for the refrigeration and dehumidification components. SUMMARY

[0005] The present application provides a liquid-cooled dehumidification unit, which solves the problem of large space occupied by the battery heat dissipation and dehumidification components.

[0006] A liquid-cooled dehumidification unit, comprising a second circuit and a bypass branch,

[0007] The second circuit comprises the evaporator, the compressor, the condenser and the expansion valve, and the compressor is used to drive the refrigerant to transfer heat from the evaporator to the condenser to reduce the temperature;

[0008] The bypass branch comprises a bypass heat exchanger and a bypass expansion valve, and the bypass branch is arranged in parallel with the evaporator. The refrigerant cooled by the condenser is divided into two paths after passing through the expansion valve, and flows through the bypass branch and the second passage of the evaporator, respectively;

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

[0010] Optionally, the condenser comprises 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 arranged on the windward side of the bypass heat exchanger is greater than the number of the tube-fin heat exchangers arranged on the leeward side of the bypass heat exchanger.

[0012] Optionally, the tube-fin heat exchangers are connected in parallel to each other, and at least part of the tube-fin heat exchangers are provided with control valves for adjusting the flow of refrigerant 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, a first circuit is further included, the first circuit comprising a driving pump, an evaporator and a heat absorber, the evaporator comprising a first channel and a second channel, the first channel being connected to the first circuit, and the second channel being connected to the second circuit.

[0015] The driving pump is used to drive the cooling liquid to transfer heat from the heat absorber to the first channel of the evaporator, and to exchange heat among the evaporator, and heat is transferred from the first channel to the second channel.

[0016] Optionally, an outlet pipe of the driving pump of the first circuit is provided with an outlet temperature sensor.

[0017] An inlet pipe of the compressor of the second circuit is provided with a suction temperature sensor and a suction pressure sensor.

[0018] An outlet pipe of the bypass heat exchanger of the bypass branch is provided with a bypass pressure sensor.

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

[0020] Optionally, air flow guide ducts are arranged on the periphery of the bypass heat exchanger and the condenser, and the air flow guide ducts are used to guide external air flow to flow through the bypass heat exchanger and the condenser to achieve condensation and dehumidification.

[0021] Optionally, the air flow guide ducts are provided with three-way reversing valves, and the three-way reversing valves are used to switch the air flow from inside the cabinet or from outside the cabinet.

[0022] The application provides a liquid cooling dehumidification unit, which comprises a second circuit and a bypass branch, a compressor provides power for the second circuit, high-temperature refrigerant of an evaporator is delivered to a condenser to radiate heat to the outside world, and the refrigerant after being cooled is returned to the evaporator; the bypass branch is arranged in parallel with the evaporator, 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 low temperature; the bypass heat exchanger and the condenser are arranged side by side, the second circuit 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, and the high-temperature air formed after passing through the condenser is cooled by the bypass heat exchanger, the water vapor carried by the high-temperature air condenses into water droplets when the high-temperature air reaches the bypass heat exchanger, and condensation dehumidification is realized. The second circuit and the bypass branch share the same fan, the structure and the pipeline are reduced, and the space utilization rate is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0024] Figure 1 It is a system principle diagram of the liquid cooling dehumidification unit of the present application;

[0025] Figure 2 It is a system principle diagram of the first circuit;

[0026] Figure 3 It is a system principle diagram of the second circuit;

[0027] Figure 4 It is a system principle diagram of the bypass branch;

[0028] Figure 5 It is a schematic diagram of the cooperation of the condenser and the bypass heat exchanger.

[0029] The drawings include:

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

[0031] The liquid outlet temperature sensor 101, the suction temperature sensor 102, the suction pressure sensor 103, and the bypass pressure sensor 104. DETAILED DESCRIPTION

[0032] In order to make those skilled in the art better understand the technical solutions of the present application, the liquid cooling dehumidification unit of the present application will be described in detail below in combination with the drawings and specific embodiments.

[0033] In combination Figure 1 As shown in the figure, the arrows in the figure represent the flow direction of the medium; the application provides a liquid-cooled dehumidification unit, which comprises a second circuit and a bypass branch, the second circuit and the bypass branch respectively have a pipeline and related devices connected on the pipeline, and the pipeline and the devices are used for flowing the medium.

[0034] In combination Figure 3 As shown in the figure, the second circuit comprises an evaporator 2, a compressor 4, a condenser 5 and an expansion valve 6, the evaporator 2, the compressor 4, the condenser 5 and the expansion valve 6 are connected in series on the pipeline, the compressor 4 is used to drive the circulation of the refrigerant 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, where the outside is relative to the condenser 5, that is, the outside here. The refrigerant after heat dissipation and cooling flows back to the evaporator 2, and circulates in this way.

[0035] In combination Figure 4 As shown in the figure, the bypass branch comprises a bypass heat exchanger 7 and a bypass expansion valve 8, the bypass heat exchanger 7 and the bypass expansion valve 8 are connected in series on the pipeline. The bypass branch is arranged in parallel with the evaporator 2, that is, the bypass heat exchanger 7 and the bypass expansion valve 8 form a parallel relationship with the evaporator 2, 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 a parallel pipeline. The refrigerant cooled by the condenser 5 is divided into two paths after passing through the expansion valve 6, and flows through the bypass branch 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 are combined 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 along the direction of the airflow. The fan 9 is a structure of independent pipeline, 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, and the airflow absorbs the heat of the refrigerant in the condenser 5 when passing through the condenser 5 first, and the temperature of the air is increased; the high-temperature air formed then passes through the bypass heat exchanger 7 and is cooled and cooled by the bypass heat exchanger 7, and the condensation and dehumidification are realized by the bypass heat exchanger 7.

[0037] The expansion valve is an important component in the refrigeration system, and the expansion valve makes the liquid refrigerant at medium temperature and high pressure throttled into wet steam at low temperature and low pressure, 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 first temperature and pressure reduction process is realized, a part of the refrigerant flows to the evaporator 2 to absorb heat, and another part of the refrigerant flows to the bypass expansion valve 8 to perform a second temperature and pressure reduction process, and the temperature of the refrigerant flowing out of the bypass expansion valve 8 is further reduced, so that the temperature of the refrigerant flowing into the bypass heat exchanger 7 is lower than that 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, and the condensation of the moisture in the air is realized.

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

[0039] The driving pump 1 of the present application is a water pump for driving the flow of liquid coolant, and the first circuit does not need to use phase change medium for heat dissipation. The compressor 4 is used to drive the flow of phase change medium refrigerant, and the second circuit uses phase change medium for heat dissipation. The compressor is a kind of fluid machinery for lifting low pressure gas to high pressure gas, which sucks in low temperature and low pressure refrigerant gas, compresses it by the motor operation, and then discharges high temperature and high pressure refrigerant gas to the exhaust pipe to provide power for the refrigeration cycle.

[0040] The condenser 5 of the present application includes a plurality of parallelly distributed tube-fin heat exchangers, and the plurality of tube-fin heat exchangers are arranged to increase the contact area with the environment 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, the windward side (front side) and the leeward side (rear side) of the bypass heat exchanger 7 are provided with tube-fin heat exchangers. The airflow blown from the front side is warmed by part of the tube-fin heat exchangers, and reaches the dew point temperature to condense into water droplets after passing through the bypass heat exchanger 7, and the dry and low temperature air continues to flow to the rear side to reach the tube-fin heat exchanger of the leeward side of the bypass heat exchanger 7, and the air is warmed again; the air overall experiences a temperature reduction and a temperature rise, so as to avoid that the finally discharged air temperature is too low to prevent other devices from experiencing sharp temperature change and maintain the stable working temperature of other devices.

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

[0042] Further, the number of tube-fin heat exchangers on the windward side of the bypass heat exchanger 7 is greater than the number of tube-fin heat exchangers on the leeward side of the bypass heat exchanger 7, which, in combination with Figure 5 As shown, the air flows from left to right, with the left being the front side and the right being the back side. Three tube-fin heat exchangers are arranged on the front side, and one tube-fin heat exchanger is arranged on the back side. The tube-fin heat exchangers on the front side have a larger contact area, concentrating heat release to the air, causing the air temperature to rise higher. When the air passes through the bypass heat exchanger 7, the temperature drops sharply, and then when the air passes through the fewer tube-fin heat exchangers on the back side, the air temperature rises at a smaller amplitude, allowing the air to recover to an appropriate temperature.

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

[0044] In combination with Figure 1 , Figure 5 As shown, the ventilation area of the bypass heat exchanger 7 is smaller than the ventilation area of the tube-fin heat exchanger, and the ventilation area is the projection area perpendicular to the air flow direction. The projection of the bypass heat exchanger 7 in the air flow direction falls entirely within the range of the tube-fin heat exchanger. The internal volume of the bypass heat exchanger 7 is smaller than the internal volume of the condenser 5, and only a small amount of refrigerant is needed to lower the temperature of the bypass heat exchanger 7 to a lower temperature.

[0045] On the basis of any of the above schemes and their mutual combinations, the evaporator 2 includes a first channel and a second channel, and a heat conduction structure is arranged between the first channel and the second channel for conducting heat. 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 use a plate-fin heat exchanger, and the heat is conducted between the first channel and the second channel through multiple fins.

[0046] In combination with Figure 2As shown, the liquid cooling dehumidification unit of the present application further comprises a first circuit, the first circuit comprising a driving pump 1, an evaporator 2 and a heat absorber 3, the three devices being connected in series on the pipeline, and the cooling liquid among the three devices can flow in the pipeline of the first circuit. The driving pump 1 provides driving force for the first circuit, so that the internal cooling liquid can flow. The high-temperature cooling liquid discharged from the heat absorber 3 is transferred to the evaporator 2 for heat dissipation, and the cooled cooling liquid is returned to the heat absorber 3. The driving pump 1 is used to drive the cooling liquid to flow between the first passage of the evaporator 2 and the heat absorber 3, and the cooling liquid exchanges heat in the evaporator 2 and the heat absorber 3; the cooling liquid absorbs heat at the heat absorber 3 and is heated, and the heated cooling liquid flows to the first passage of the evaporator 2, and the cooling liquid releases heat in the first passage of the evaporator 2 and is cooled, and the cooled cooling liquid flows to the heat absorber 3, so as to form continuous circulation flow.

[0047] The cooling liquid transfers heat from the heat absorber 3 to the evaporator 2. In the present application, the heat absorber 3 contacts the heat source and transmits the heat emitted by the heat source to the cooling liquid. When the liquid cooling dehumidification unit of the present application is applied to electrochemical energy storage, the heat source is a battery module, and the heat of the battery module is conducted to the evaporator 2 through the heat absorber 3.

[0048] The first circuit transfers the heat of the battery module to the first passage of the evaporator 2, and the heat exchange through the first passage and the second passage makes the heat enter the second circuit; the refrigerant of the second circuit is cooled after passing through the condenser 5, and then flows to the bypass branch and the second passage of the evaporator 2 after passing through the expansion valve 6, and is further cooled after passing through the bypass expansion valve 8 of the bypass branch, so that the bypass heat exchanger 7 reaches the dew point temperature, and the hot air passing through the condenser 5 can be rapidly cooled and condensed to remove the moisture in the air. Through the continuous repetition of this process, the battery module can be cooled and the moisture content in the air can be reduced.

[0049] In combination Figure 1 As shown, the outlet pipeline of the driving pump 1 of the first circuit is provided with a liquid outlet temperature sensor 101 for detecting the temperature of the cooling liquid discharged from the driving pump 1. The inlet pipeline 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 pipeline of the bypass heat exchanger 7 of the bypass branch 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 the bypass expansion valve 8 of the present application are both electronic expansion valves, which are controlled by the suction temperature and the low pressure, control the suction superheat degree, and avoid compressor liquid return. The detection signals of the suction temperature sensor 102 and the suction pressure sensor 103 are used as feedback signals to adjust the opening degree of the expansion valve 6; the detection pressure of the bypass pressure sensor 104 is used as a feedback signal to control the opening degree of the bypass expansion valve 8. The bypass pressure is used as a feedback signal to control the opening degree of the bypass expansion valve 8, so as to control the evaporation pressure of the bypass heat exchanger 7, reduce the air temperature after passing through the bypass heat exchanger 7 to the dew point temperature, and achieve the purpose of condensation 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 alternative embodiment, the liquid cooling dehumidification unit of the present application is installed in a cabinet, and an air flow guide duct is installed in the cabinet, the bypass heat exchanger 7 and the condenser 5 are surrounded by the air flow guide duct, and the bypass heat exchanger 7 and the condenser 5 are installed in the air flow guide duct. One end of the air flow guide duct is connected to the air outside the cabinet for introducing air into the cabinet. The air flow guide duct is used to guide the external air flow to pass through the bypass heat exchanger 7 and the condenser 5 to achieve condensation dehumidification. Here, the external environment refers to outside the cabinet, that is, before the air outside the cabinet enters the cabinet, it first passes through the bypass heat exchanger 7 and the condenser 5 for dehumidification process, which can reduce the humidity of the air entering the cabinet.

[0052] The air flow guide duct of the present application is provided with a three-way reversing valve for switching the air inlet from the cabinet or from the outside. When the three-way reversing valve is used to switch the air inlet from the cabinet, the air in the cabinet is continuously circulated and dehumidified by passing through the bypass heat exchanger 7 and the condenser 5. If the air in the cabinet is continuously circulated, the temperature in the cabinet will continuously rise, which is not conducive to the heat dissipation of the device, and therefore the air inlet from the outside needs to be switched to replace part of the air in the cabinet with fresh air from the outside. If the ambient temperature is low, the air in the cabinet can be circulated.

[0053] The liquid cooling dehumidification unit of the present application is a heat dissipation cooling and dehumidification integrated machine, which improves the space utilization. The waste heat is recovered to improve the dehumidification temperature and reduce the discomfort of the waste heat exhaust area. The present application can shorten the compressor downtime and improve the water temperature response.

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

Claims

1. A liquid-cooled dehumidification unit, comprising: The second circuit and a bypass branch circuit are included, The second circuit includes an evaporator (2), a compressor (4), a condenser (5), and an expansion valve (6), the compressor (4) is used to drive refrigerant to transfer heat from the evaporator (2) to the condenser (5) to be cooled; The bypass branch circuit includes a bypass heat exchanger (7) and a bypass expansion valve (8), the bypass branch circuit is arranged in parallel with the evaporator (2), and the refrigerant cooled by the condenser (5) is divided into two paths after passing through the expansion valve (6) to flow through the bypass branch circuit and the second passage of the evaporator (2) respectively; The bypass heat exchanger (7) and the condenser (5) are arranged along the direction of the airflow, and a 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 it to realize condensation and dehumidification. The condenser (5) includes a plurality of finned tube heat exchangers arranged side by side, and the bypass heat exchanger (7) is arranged between the finned tube heat exchangers.

2. The liquid-cooled dehumidification unit of claim 1, wherein, The number of finned tube heat exchangers on the windward side of the bypass heat exchanger (7) is greater than the number of finned tube heat exchangers on the leeward side of the bypass heat exchanger (7).

3. The liquid-cooled dehumidification unit of claim 1, wherein, The finned tube heat exchangers are connected in parallel with each other, at least part of the finned tube heat exchangers are provided with control valves, and the control valves are used to adjust the refrigerant flow of the corresponding finned tube heat exchangers.

4. The liquid-cooled dehumidification unit of claim 1, wherein, The ventilation area of the bypass heat exchanger (7) is smaller than the ventilation area of the condenser (5).

5. The liquid-cooled dehumidification unit according to any one of claims 1 to 4, wherein, A first circuit is further included, the first circuit includes a driving pump (1), an evaporator (2), and a heat absorber (3), the evaporator (2) includes a first passage and a second passage, the first passage is connected to the first circuit, and the second passage is connected to the second circuit; The driving pump (1) is used to drive the cooling liquid to transfer heat from the heat absorber (3) to the first passage of the evaporator (2) and exchange heat in the evaporator (2), and the heat is transferred from the first passage to the second passage.

6. The liquid-cooled dehumidification unit of claim 5, wherein, An outlet pipeline of the driving pump (1) of the first circuit is provided with a liquid outlet temperature sensor (101); An inlet pipeline of the compressor (4) of the second circuit is provided with a suction temperature sensor (102) and a suction pressure sensor (103); An outlet pipeline of the bypass heat exchanger (7) of the bypass branch circuit is provided with a bypass pressure sensor (104).

7. The liquid-cooled dehumidification unit of claim 6, wherein, The expansion valve (6) and the bypass expansion valve (8) are electronic expansion valves, the detection signals of the suction temperature sensor (102) and the suction pressure sensor (103) are used as feedback signals to adjust the opening degree of the expansion valve (6), and the detection signal of the bypass pressure sensor (104) is used as a feedback signal to adjust the opening degree of the bypass expansion valve (8).

8. The liquid-cooled dehumidification unit of claim 4, wherein, Airflow guide air ducts are arranged on the periphery of the bypass heat exchanger (7) and the condenser (5), and are used to guide external airflow to pass through the bypass heat exchanger (7) and the condenser (5) to realize condensation and dehumidification.

9. The liquid-cooled dehumidification unit of claim 8, wherein, The air flow guide duct is provided with a three-way reversing valve for switching between air intake from inside the cabinet or air intake from outside the cabinet.

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