Cooling unit and control method thereof

Abstract

The invention discloses a cooling unit and a control method thereof.The cooling unit comprises a first cooling system, a second cooling system, an indoor fan and an outdoor fan, the first cooling system further comprises at least one of a first bypass branch and a second bypass branch, and the first bypass branch and the second bypass branch are both connected with a first circulation flow path; at least one of the condenser and the evaporator in the second cooling system forms two heat exchange flow channels which are separated from each other and exchange heat with each other, and one heat exchange flow channel of the evaporator or the condenser forms one part of a second circulation flow path. And the other heat exchange flow channel of the evaporator forms one part of the first bypass branch, or the other heat exchange flow channel of the condenser forms one part of the second bypass branch. According to the cooling unit, the wind resistance is small, the power consumption of the indoor fan or the outdoor fan can be reduced, and the energy efficiency of the whole machine can be improved.

Description

Technical Field

[0001] This invention relates to the field of cooling equipment, and in particular to a cooling unit and its control method. Background Technology

[0002] Cooling units are typically used for temperature control in industrial settings or large spaces, such as data center server rooms. In related technologies, cooling units utilize dry air energy for cooling. Outdoor and indoor air flow through a heat exchange core, where indirect heat exchange occurs, allowing the outdoor air to cool the indoor air and thus cooling the relevant heat source. However, the flow resistance within the heat exchange core is relatively high, reducing the energy efficiency of the cooling unit. Therefore, improvements are needed. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of the present invention is to provide a cooling unit that can reduce airflow resistance, reduce the power consumption of indoor or outdoor fans, and improve the energy efficiency of the cooling unit.

[0004] A cooling unit according to a first aspect of the present invention includes: a first cooling system comprising a circulating pump, a first heat exchanger, and a second heat exchanger, wherein the circulating pump, the first heat exchanger, and the second heat exchanger are sequentially connected to form a first circulating flow path, the first heat exchanger being located indoors and the second heat exchanger being located outdoors; the first cooling system further comprising at least one of a first bypass branch and a second bypass branch, both of which are connected to the first circulating flow path; and a second cooling system comprising a compressor, a condenser, a throttling device, and an evaporator, wherein the compressor, the condenser, the throttling device, and the evaporator are sequentially connected to form a second circulating flow path, wherein at least one of the condenser and the evaporator is mutually isolated and mutually... The heat exchangers consist of two heat exchange channels. When the evaporator has two heat exchange channels, one of the heat exchange channels of the evaporator forms part of the second circulation path and the other heat exchange channel of the evaporator forms part of the first bypass branch. When the condenser has two heat exchange channels, one of the heat exchange channels of the condenser forms part of the second circulation path and the other heat exchange channel of the condenser forms part of the second bypass branch. An indoor fan is located indoors and is used to drive indoor air to flow through the first heat exchanger or through the first heat exchanger and the evaporator. An outdoor fan is located outdoors and is used to drive outdoor air to flow through the second heat exchanger or through the second heat exchanger and the condenser.

[0005] According to the cooling unit of the present invention, by including a circulating pump, a first heat exchanger, and a second heat exchanger in the first circulating flow path, the coolant in the first circulating flow path exchanges heat with the outdoor air in the second heat exchanger. Compared with the related art where the outdoor air and indoor air exchange heat in the heat exchange core, the resistance of outdoor airflow can be reduced, the power consumption of the outdoor fan can be reduced, and the energy efficiency of the cooling unit can be improved. By forming two heat exchange channels that are mutually isolated and exchange heat with each other in at least one of the condenser and evaporator, the indoor air can only flow through the first heat exchanger for heat exchange and / or the outdoor air can only flow through the second heat exchanger for heat exchange, thereby reducing the resistance of airflow, reducing the power consumption of the indoor fan or the outdoor fan, and improving the energy efficiency of the cooling unit.

[0006] According to some embodiments of the present invention, the first cooling system includes the first bypass branch, the evaporator forms two heat exchange channels that are separated from each other and exchange heat with each other, the indoor fan is used to drive indoor air to flow through the first heat exchanger, and the condenser is a tube-fin heat exchanger or a microchannel heat exchanger.

[0007] According to some embodiments of the present invention, the condenser is located upstream of the second heat exchanger in the direction of outdoor airflow.

[0008] According to some embodiments of the present invention, the first cooling system includes a second bypass branch, the condenser forms two heat exchange channels that are isolated from each other and exchange heat with each other, the outdoor fan is used to drive outdoor air to flow through the second heat exchanger, and the evaporator is a tube-fin heat exchanger or a microchannel heat exchanger.

[0009] According to some embodiments of the present invention, the evaporator is located downstream of the first heat exchanger in the direction of indoor airflow.

[0010] According to some embodiments of the present invention, at least one of the condenser and the evaporator is a plate heat exchanger; and / or, the first cooling system includes a first bypass branch and a second bypass branch, and both the condenser and the evaporator form two heat exchange channels that are isolated from each other and exchange heat with each other.

[0011] According to some embodiments of the present invention, the first cooling system includes a second bypass branch, the condenser forms two heat exchange channels that are isolated from each other and exchange heat with each other, the first cooling system includes a second bypass branch, the outlet end of the first heat exchanger and the inlet end of the second heat exchanger are connected through a first connecting pipe, and the inlet end of the second bypass branch and the outlet end of the second bypass branch are both connected to the first connecting pipe.

[0012] According to some embodiments of the present invention, the first cooling system further includes a three-way valve having a valve inlet, a first valve outlet, and a second valve outlet. The first connecting pipe includes a first connecting pipe section and a second connecting pipe section. One end of the first connecting pipe section is connected to the valve inlet, and the other end of the first connecting pipe section is connected to the outlet end of the first heat exchanger and the valve inlet, or connected to the outlet end of the first heat exchanger and the outlet end of one of the heat exchange channels of the evaporator. The second connecting pipe section connects the first valve outlet to the inlet end of the second heat exchanger. The second valve outlet is connected to the inlet end of the second bypass branch, and the outlet end of the second bypass branch is connected to the second connecting pipe section.

[0013] According to some embodiments of the present invention, the first cooling system includes a first bypass branch, which is connected in parallel with the first heat exchanger.

[0014] According to some embodiments of the present invention, the outlet end of the first heat exchanger is connected to the inlet end of the second heat exchanger via a first connecting pipe, and the inlet end of the first heat exchanger is connected to the outlet end of the second heat exchanger via a second connecting pipe. The first cooling system includes a first bypass branch and a second bypass branch. The condenser and the evaporator each form two heat exchange channels that are isolated from each other and exchange heat with each other. The inlet end and the outlet end of the second bypass branch are both connected to the first connecting pipe. The inlet end of the first bypass branch is connected to the first connecting pipe, and the outlet end of the first bypass branch is connected to the second connecting pipe. The inlet end of the first bypass branch is located upstream of the inlet end of the second bypass branch.

[0015] According to some embodiments of the present invention, the first cooling system includes a first bypass branch, the evaporator forms two heat exchange channels that are isolated from each other and exchange heat with each other, and the first bypass branch is provided with a control valve for controlling the opening and closing of the first bypass branch.

[0016] According to some embodiments of the present invention, the first cooling system includes a first bypass branch, the evaporator forms two heat exchange channels that are isolated from each other and exchange heat with each other, the first cooling system includes a cooling branch located indoors and connected in parallel with the first heat exchanger, the cooling branch being used to dissipate heat from the indoor cabinet.

[0017] According to some embodiments of the present invention, the outlet end of the first heat exchanger is connected to the inlet end of the second heat exchanger via a first connecting pipe, the inlet end of the first heat exchanger is connected to the outlet end of the second heat exchanger via a second connecting pipe, the first bypass branch is arranged in parallel with the first heat exchanger, the inlet end of the first bypass branch and the outlet end of the cooling branch are both connected to the first connecting pipe, the outlet end of the cooling branch is located upstream of the inlet end of the first bypass branch, the outlet end of the first bypass branch and the inlet end of the cooling branch are connected to the second connecting pipe, and the inlet end of the cooling branch is located downstream of the outlet end of the first bypass branch.

[0018] According to some embodiments of the present invention, a spraying system is included, the spraying system being used to spray cooling water onto the second heat exchanger or to spray cooling water onto both the second heat exchanger and the condenser.

[0019] According to a second aspect of the present invention, a control method for a cooling unit, wherein the cooling unit is a cooling unit according to a first aspect of the present invention, the control method for the cooling unit includes: detecting an outdoor ambient temperature; controlling the cooling unit according to the current outdoor ambient temperature; wherein controlling the cooling unit according to the current outdoor ambient temperature includes: determining the relationship between the current outdoor ambient temperature and a second preset temperature and a third preset temperature, wherein the third preset temperature is greater than the second preset temperature; when the outdoor ambient temperature is less than or equal to the second preset temperature, controlling the outdoor fan, the indoor fan, and the circulation pump to operate, and controlling the compressor to shut down; when the outdoor ambient temperature is greater than the second preset temperature and less than or equal to the third preset temperature, controlling the outdoor fan, the indoor fan, the circulation pump, and the compressor to all operate, and controlling the compressor to operate at a first frequency; when the outdoor ambient temperature is greater than the third preset temperature, controlling the outdoor fan, the indoor fan, the circulation pump, and the compressor to all operate, and controlling the compressor to operate at a second frequency, wherein the second frequency is greater than the first frequency.

[0020] According to the control method of the cooling unit of the present invention, the compressor can change its operating frequency according to the outdoor ambient temperature. When the outdoor environment is hot, the compressor operates at the first frequency, so that the second circulation pipeline provides sufficient cooling while appropriately reducing the energy consumption of the cooling unit. When the outdoor environment is even hotter, the compressor frequency is increased to increase the cooling capacity of the second circulation pipeline, so that the cooling unit has sufficient cooling capacity when the outdoor environment is even hotter.

[0021] According to some embodiments of the present invention, the first frequency is a range value, and controlling the compressor to operate at the first frequency includes: adjusting the frequency of the compressor within the first frequency range according to the temperature difference between the actual air supply temperature and the set air supply temperature; and / or, the second frequency is a range value, and controlling the compressor to operate at the second frequency includes: adjusting the frequency of the compressor within the second frequency range according to the temperature difference between the actual air supply temperature and the set air supply temperature.

[0022] According to some embodiments of the present invention, the cooling unit includes a spray system for spraying cooling water onto the second heat exchanger or for spraying cooling water onto both the second heat exchanger and the condenser. The cooling unit is controlled based on the current outdoor ambient temperature. The system further includes: determining the relationship between the current outdoor ambient temperature and a first preset temperature and a second preset temperature, wherein the first preset temperature is less than the second preset temperature; when the outdoor ambient temperature is greater than the first preset temperature and less than or equal to the second preset temperature, controlling the outdoor fan, the indoor fan, the circulating pump, and the spray system to operate, and controlling the compressor to shut down; when the outdoor ambient temperature is less than or equal to the first preset temperature, controlling the outdoor fan, the indoor fan, and the circulating pump to operate, and controlling the compressor and the spray system to shut down.

[0023] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0025] Figure 1 This is a simplified diagram of a cooling unit according to some embodiments of the present invention;

[0026] Figure 2 This is a simplified diagram of a cooling unit according to other embodiments of the present invention;

[0027] Figure 3 This is a simplified diagram of a cooling unit according to some embodiments of the present invention;

[0028] Figure 4 This is a simplified diagram of a cooling unit according to some embodiments of the present invention.

[0029] Figure label:

[0030] 100. Cooling unit;

[0031] 1. First cooling system; 10. Circulating pump; 11. First heat exchanger; 12. Second heat exchanger; 13. First bypass branch; 131. Control valve; 14. Second bypass branch; 15. Three-way valve; 150. Valve inlet; 151. First valve outlet; 152. Second valve outlet; 16. Cooling branch; 161. Liquid cooling cabinet;

[0032] 2. Second cooling system; 21. Compressor; 22. Condenser; 23. Throttling component; 24. Evaporator; 3. Indoor fan; 4. Outdoor fan; 5. Spray system; 51. Water tank; 52. Spray pump; 53. Spray components. Detailed Implementation

[0033] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0034] The following is for reference. Figures 1-4 A cooling unit 100 and its control method are described according to an embodiment of the present invention.

[0035] According to a first aspect of the present invention, a cooling unit 100 includes: a first cooling system 1, a second cooling system 2, an outdoor fan 4, and an indoor fan 3.

[0036] Reference Figures 1-4 The first cooling system 1 includes a circulating pump 10, a first heat exchanger 11, and a second heat exchanger 12. The circulating pump 10, the first heat exchanger 11, and the second heat exchanger 12 are connected in sequence to form a first circulating flow path. The first heat exchanger 11 is located indoors, and the second heat exchanger 12 is located outdoors. The first cooling system 1 also includes at least one of a first bypass branch 13 and a second bypass branch 14. Both the first bypass branch 13 and the second bypass branch 14 are connected to the first circulating flow path.

[0037] The second cooling system 2 includes a compressor 21, a condenser 22, a throttling component 23, and an evaporator 24. The compressor 21, condenser 22, throttling component 23, and evaporator 24 are connected in sequence to form a second circulation path. At least one of the condenser 22 and evaporator 24 has two heat exchange channels that are isolated from each other but exchange heat with each other. When the evaporator 24 has two heat exchange channels, one heat exchange channel of the evaporator 24 constitutes part of the second circulation path, and the other heat exchange channel of the evaporator 24 constitutes part of the first bypass branch 13. When the condenser 22 has two heat exchange channels, one heat exchange channel of the condenser 22 constitutes part of the second circulation path, and the other heat exchange channel of the condenser 22 constitutes part of the second bypass branch 14.

[0038] The indoor fan 3 is located indoors and is used to drive indoor air to flow through the first heat exchanger 11 or through the first heat exchanger 11 and the evaporator 24; the outdoor fan 4 is located outdoors and is used to drive outdoor air to flow through the second heat exchanger 12 or through the second heat exchanger 12 and the condenser 22.

[0039] For example, the coolant in the first circulation path is an ethylene glycol solution, and the cooling medium in the second circulation path is a refrigerant.

[0040] For example, the first cooling system 1 includes a first bypass branch 13; for another example, the first cooling system 1 includes a second bypass branch 14; and for yet another example, the first cooling system 1 includes a first bypass branch 13 and a second bypass branch 14.

[0041] For example, the first heat exchanger 11 can be a tube-fin heat exchanger or a microchannel heat exchanger; the second heat exchanger 12 can be a tube-fin heat exchanger or a microchannel heat exchanger.

[0042] For example, refer to Figure 2 The first cooling system 1 includes a second bypass branch 14 but does not include a first bypass branch 13. The condenser 22 forms two heat exchange channels that are isolated from each other and exchange heat with each other. The condenser 22 can exchange heat between the cooling medium in the second circulation channel and the cooling medium in the second bypass branch 14.

[0043] In the first circulation path, after the cooling medium cools the indoor cooling device through the first heat exchanger 11, at least part of the cooling medium flows into the second bypass branch 14. The cooling medium in the second bypass branch 14 exchanges heat with the cooling medium in the second circulation path in the condenser 22, then leaves the condenser 22, and after leaving the second bypass branch 14, enters the second heat exchanger 12 to exchange heat with the outdoor air, and finally flows into the first heat exchanger 11.

[0044] In the second circulation path, the cooling medium flowing out from the exhaust port of the compressor 21 enters the condenser 22 and exchanges heat with the cooling medium in the second bypass branch 14. Then it enters the throttle valve, and the cooling medium after being throttled by the throttle valve enters the evaporator 24 to exchange heat with the indoor air. Finally, it leaves the evaporator 24 and returns to the compressor 21 from the return port of the compressor 21.

[0045] The evaporator 24 and the first heat exchanger 11 are arranged at intervals along the direction of the airflow driven by the indoor fan 3. The indoor fan 3 drives the indoor airflow to flow through the first heat exchanger 11 and the evaporator 24, while the outdoor fan 4 drives the outdoor airflow to flow through the second heat exchanger 12 and not through the condenser 22. This can reduce the wind resistance of the outdoor airflow, reduce the power consumption of the outdoor fan 4, and improve the energy efficiency of the cooling unit 100.

[0046] For example, refer to Figure 1 The first cooling system 1 includes a second bypass branch 14 but does not include a first bypass branch 13. The evaporator 24 forms two heat exchange channels that are isolated from each other and exchange heat with each other. The evaporator 24 can exchange heat between the cooling medium in the second circulation channel and the cooling medium in the first bypass branch 13.

[0047] In the first circulation path, after the cooling medium cools the indoor cooling device through the first heat exchanger 11, the cooling medium is divided into two paths. One path of the cooling medium flows into the first bypass branch 13, where it exchanges heat with the cooling medium in the second circulation path in the evaporator 24. After leaving the evaporator 24 and the first bypass branch 13, the cooling medium passes through the first heat exchanger 11 again to cool the indoor cooling device. The other path of the cooling medium exchanges heat with the outdoor air through the second heat exchanger 12 and finally flows into the first heat exchanger 11.

[0048] In the second circulation path, the cooling medium flowing out from the exhaust port of the compressor 21 enters the condenser 22 to exchange heat with the outdoor air, and then enters the throttle valve. After being throttled by the throttle valve, the cooling medium enters the evaporator 24 to exchange heat with the cooling medium in the first bypass branch 13, and finally leaves the evaporator 24 and returns to the compressor 21 from the return port of the compressor 21.

[0049] The condenser 22 and the second heat exchanger 12 are arranged at intervals along the direction of the airflow driven by the outdoor fan 4. The outdoor fan 4 drives the indoor airflow to flow through the second heat exchanger 12 and the condenser 22. The indoor fan 3 drives the indoor airflow to flow through the first heat exchanger 11 and does not flow through the evaporator 24. This can reduce the wind resistance of the outdoor airflow, reduce the power consumption of the indoor fan 3, and improve the energy efficiency of the cooling unit 100.

[0050] For example, refer to Figure 3 and Figure 4 The first cooling system 1 includes a first bypass branch 13 and a second bypass branch 14. The evaporator 24 forms two heat exchange channels that are isolated from each other but exchange heat with each other. The evaporator 24 can exchange heat between the cooling medium in the second circulation channel and the cooling medium in the first bypass branch 13. The condenser 22 forms two heat exchange channels that are isolated from each other but exchange heat with each other. The condenser 22 can exchange heat between the cooling medium in the second circulation channel and the cooling medium in the second bypass branch 14.

[0051] In the first circulation path, after the cooling medium cools the indoor cooling device through the first heat exchanger 11, the cooling medium is divided into two paths. One path of the cooling medium flows into the first bypass branch 13, where it exchanges heat with the cooling medium in the second circulation path in the evaporator 24, and then leaves the evaporator 24. After leaving the first bypass branch 13, it passes through the first heat exchanger 11 again to cool the indoor cooling device. At least a portion of the other path of the cooling medium flows into the second bypass branch 14, where it exchanges heat with the cooling medium in the second circulation path in the condenser 22, and then leaves the condenser 22. After leaving the second bypass branch 14, it enters the second heat exchanger 12 to exchange heat with the outdoor air, and finally flows into the first heat exchanger 11.

[0052] In the second circulation path, the cooling medium flowing out from the exhaust port of the compressor 21 enters the condenser 22 and exchanges heat with the cooling medium in the second bypass branch 14. Then it enters the throttle valve, and the cooling medium after being throttled by the throttle valve enters the evaporator 24 and exchanges heat with the cooling medium in the first bypass branch 13. Finally, it leaves the evaporator 24 and returns to the compressor 21 from the return port of the compressor 21.

[0053] The outdoor fan 4 drives the indoor airflow through the second heat exchanger 12 but not through the condenser 22, and the indoor fan 3 drives the indoor airflow through the first heat exchanger 11 but not through the evaporator 24. This reduces the wind resistance when the indoor and outdoor airflows pass through the heat exchangers, the power consumption of the indoor fan 3 and the outdoor fan 4, and improves the energy efficiency of the cooling unit 100.

[0054] By having at least one of the condenser 22 and evaporator 24 form two heat exchange channels that are isolated from each other but exchange heat with each other, that is, the condenser 22 can allow the refrigerant in the second circulation path to exchange heat with the liquid in the second bypass branch 14, or the evaporator 24 can allow the refrigerant in the second circulation path to exchange heat with the liquid in the first bypass branch 13, the indoor air can only flow through the first heat exchanger 11 for heat exchange and / or the outdoor air can only flow through the second heat exchanger 12 for heat exchange, thereby reducing the power consumption of the indoor fan 3 or the outdoor fan 4, and reducing the air supply temperature interference problem caused by the overlapping placement of the two heat exchangers, thus improving the energy efficiency of the cooling unit 100.

[0055] According to the embodiments of the present invention, the cooling unit 100 includes a first circulation path comprising a circulation pump 10, a first heat exchanger 11, and a second heat exchanger 12, allowing the coolant in the first circulation path to exchange heat with outdoor air in the second heat exchanger 12. Compared to related technologies where outdoor air and indoor air exchange heat within the heat exchange core, this reduces the resistance to outdoor airflow, lowers the power consumption of the outdoor fan 4, and improves the energy efficiency of the cooling unit 100. Furthermore, by having at least one of the condenser 22 and the evaporator 24 form two heat exchange channels that are mutually isolated and exchange heat with each other, indoor air can only flow through the first heat exchanger 11 for heat exchange and / or outdoor air can only flow through the second heat exchanger 12 for heat exchange, reducing the resistance to airflow, lowering the power consumption of the indoor fan 3 or the outdoor fan 4, and improving the energy efficiency of the cooling unit 100.

[0056] Reference Figure 3 and Figure 4 According to some embodiments of the present invention, the first cooling system 1 includes a first bypass branch 13, an evaporator 24 having two heat exchange channels that are isolated from each other but exchange heat with each other, an indoor fan 3 for driving indoor air to flow through the first heat exchanger 11, and a condenser 22 being a tube-fin heat exchanger or a microchannel heat exchanger. In this case, the condenser 22 and the second heat exchanger 12 are placed alternately, so that the outdoor fan 4 drives indoor airflow through the second heat exchanger 12 and the condenser 22. By having the evaporator 24 form two heat exchange channels that are isolated from each other but exchange heat with each other, and the indoor fan 3 driving indoor airflow through the first heat exchanger 11 but not through the evaporator 24, the power consumption of the indoor fan 3 can be reduced, and the airflow temperature interference problem caused by the overlapping placement of the two indoor heat exchangers can be reduced, thus improving the energy efficiency of the cooling unit 100.

[0057] According to some embodiments of the present invention, the condenser 22 is located upstream of the second heat exchanger 12 in the direction of outdoor airflow. By positioning the condenser 22 upstream of the second heat exchanger 12, the heat exchange efficiency of the condenser 22 can be improved.

[0058] Reference Figures 1-4According to some embodiments of the present invention, the first cooling system 1 includes a second bypass branch 14, the condenser 22 has two heat exchange channels that are isolated from each other but exchange heat with each other, the outdoor fan 4 drives outdoor air to flow through the second heat exchanger 12, and the evaporator 24 is a tube-fin heat exchanger or a microchannel heat exchanger. The evaporator 24 is placed at an interval from the first heat exchanger 11, so that the indoor fan 3 drives indoor airflow to flow through the first heat exchanger 11 and the evaporator 24. By forming two heat exchange channels that are isolated from each other but exchange heat with each other in the condenser 22, the outdoor fan 4 drives outdoor airflow to flow through the second heat exchanger 12 but not through the condenser 22. This reduces the power consumption of the outdoor fan 4 and reduces the air supply temperature interference caused by the overlapping placement of the two outdoor heat exchangers, thereby improving the energy efficiency of the cooling unit 100.

[0059] According to some embodiments of the present invention, the evaporator 24 is located downstream of the first heat exchanger 11 in the direction of indoor airflow. By positioning the evaporator 24 downstream of the first heat exchanger 11, the heat exchange efficiency of the evaporator 24 can be improved.

[0060] Reference Figures 1-4 According to some embodiments of the present invention, at least one of the condenser 22 and the evaporator 24 is a plate heat exchanger. By making at least one of the condenser 22 and the evaporator 24 a plate heat exchanger, and replacing the tube-fin heat exchanger or the microchannel heat exchanger with a plate heat exchanger, the cooling medium in the second circulation channel can exchange heat with the cooling medium in the first circulation channel. This allows the outdoor fan 4 to drive the outdoor airflow through the second heat exchanger 12 without flowing through the condenser 22, or the indoor fan 3 to drive the indoor airflow through the first heat exchanger 11 without flowing through the evaporator 24, reducing the losses of the outdoor fan 4 or the indoor fan 3, and reducing the air supply temperature interference problem caused by the overlapping placement of the two heat exchangers, thereby improving the energy efficiency of the cooling unit 100.

[0061] Reference Figure 4 According to some embodiments of the present invention, the first cooling system 1 includes a first bypass branch 13 and a second bypass branch 14, and both the condenser 22 and the evaporator 24 form two heat exchange channels that are isolated from each other but exchange heat with each other. By forming two heat exchange channels that are isolated from each other and exchange heat with each other in both the condenser 22 and the evaporator 24, the cooling medium in the second circulation channel can exchange heat with the cooling medium in the first circulation channel. This allows the outdoor fan 4 to drive outdoor airflow through the second heat exchanger 12 without flowing through the condenser 22, and the indoor fan 3 to drive indoor airflow through the first heat exchanger 11 without flowing through the evaporator 24, reducing the losses of the outdoor fan 4 and the indoor fan 3, and reducing the air supply temperature interference problem caused by the overlapping placement of the two heat exchangers, thereby improving the energy efficiency of the cooling unit 100.

[0062] Reference Figure 1 and Figure 4 According to some embodiments of the present invention, the first cooling system 1 includes a second bypass branch 14, and the condenser 22 forms two heat exchange channels that are isolated from each other but exchange heat with each other. The first cooling system 1 includes the second bypass branch 14, and the outlet end of the first heat exchanger 11 and the inlet end of the second heat exchanger 12 are connected through a first connecting pipe. The inlet end and the outlet end of the second bypass branch 14 are both connected to the first connecting pipe. By connecting the inlet end and the outlet end of the second bypass branch 14 to the first connecting pipe, the refrigerant in the first connecting pipe can enter the second bypass branch 14 and enter the condenser 22 to exchange heat with the cooling medium in the second circulation path, and then leave the second bypass branch 14 and flow back to the first connecting pipe. That is, the heat dissipated by the cooling medium in the second circulation path is transferred to the cooling medium in the first circulation path. The cooling medium in the first circulation path then dissipates this heat through the second heat exchanger 12, which can remove the waste heat of the cooling medium in the second circulation path.

[0063] Reference Figures 2-4 According to some embodiments of the present invention, the first cooling system 1 further includes a three-way valve 15, which has a valve inlet 150, a first valve outlet 151, and a second valve outlet 152. The first connecting pipe includes a first connecting pipe section and a second connecting pipe section. One end of the first connecting pipe section is connected to the valve inlet 150, and the other end of the first connecting pipe section is connected to the outlet end of the first heat exchanger 11 or to the outlet end of the first heat exchanger 11 and the outlet end of one of the heat exchange channels of the evaporator 24. The second connecting pipe section connects the first valve outlet 151 to the inlet end of the second heat exchanger 12. The second valve outlet 152 is connected to the inlet end of the second bypass branch 14, and the outlet end of the second bypass branch 14 is connected to the second connecting pipe section.

[0064] For example, the first circulation path includes a first bypass branch 13 but does not include a second bypass branch 14, the outlet end of the first heat exchanger 11 is connected to the valve inlet 150, the first valve outlet 151 is connected to the inlet end of the second heat exchanger 12, and the second valve outlet 152 is connected to the inlet end of the second bypass branch 14.

[0065] For example, the first circulation path includes a first bypass branch 13 and a second bypass branch 14. The outlet end of the first heat exchanger 11 and the outlet end of the heat exchange channel of the evaporator 24 are both connected to the valve inlet 150. The first valve outlet 151 is connected to the inlet end of the second heat exchanger 12, and the second valve outlet 152 is connected to the inlet end of the second bypass branch 14.

[0066] For example, when the outdoor ambient temperature is low, the compressor 21 can be turned off and the first valve outlet 151 opened while the second valve outlet 152 is closed. The heat exchange medium flowing out of the outlet of the first heat exchanger 11 enters the three-way valve 15 through the valve inlet 150, then leaves the three-way valve 15 through the first valve outlet 151, and enters the second heat exchanger 12 for heat exchange. The heat exchange medium in the first circulation path can provide sufficient cooling simply by exchanging heat with the outdoor ambient temperature, thus reducing the electrical energy consumed by the cooling unit 100 while ensuring sufficient cooling capacity.

[0067] For example, when the outdoor ambient temperature is high, compressor 21 can be turned on, and the first valve outlet 151 and the second valve outlet 152 can be opened. The heat exchange medium flowing out of the outlet end of the first heat exchanger 11 enters the three-way valve 15 through valve inlet 150. Part of the heat exchange medium leaves the three-way valve 15 through the second valve outlet 152 and enters the second bypass pipeline, where it exchanges heat with the second circulation path in the condenser 22. Then, it leaves the second bypass pipeline and enters the second heat exchanger 12 for heat exchange. The other part of the heat exchange medium leaves the three-way valve 15 through the first valve outlet 151 and enters the second heat exchanger 12 for heat exchange. The heat exchange medium in the first circulation path cannot provide sufficient cooling by only exchanging heat with the outdoor ambient temperature. This allows for more sufficient cooling capacity and improves the cooling capacity of the cooling unit 100.

[0068] By including a three-way valve 15 in the first cooling system 1, and connecting the three-way valve 15 to the outlet end of the first heat exchanger 11, the inlet end of the second heat exchanger 12, and the inlet end of the second bypass branch 14 respectively, the three-way valve 15 can control the opening and closing of the first circulation path and the second bypass branch 14, thereby reducing the electrical energy consumed by the compressor 21 while ensuring sufficient cooling capacity.

[0069] Reference Figure 4 According to some embodiments of the present invention, the first cooling system 1 includes a first bypass branch 13, which is connected in parallel with the first heat exchanger 11. By connecting the first bypass branch 13 in parallel with the first heat exchanger 11, a portion of the cooling medium can exchange heat in the first heat exchanger 11 and then more quickly enter the evaporator 24 through the first bypass branch 13 for cooling before entering the first heat exchanger 11, thereby improving the cooling capacity of the cooling unit 100.

[0070] Reference Figure 4According to some embodiments of the present invention, the outlet end of the first heat exchanger 11 is connected to the inlet end of the second heat exchanger 12 through a first connecting pipe, and the inlet end of the first heat exchanger 11 is connected to the outlet end of the second heat exchanger 12 through a second connecting pipe. The first cooling system 1 includes a first bypass branch 13 and a second bypass branch 14. The condenser 22 and the evaporator 24 are both formed with two heat exchange channels that are isolated from each other and exchange heat with each other.

[0071] The inlet and outlet of the second bypass branch 14 are both connected to the first connecting pipeline. The inlet of the first bypass branch 13 is connected to the first connecting pipeline, and the outlet of the first bypass branch 13 is connected to the second connecting pipeline. The inlet of the first bypass branch 13 is located upstream of the inlet of the second bypass branch 14.

[0072] By forming two heat exchange channels that are mutually isolated and exchange heat with each other in both the condenser 22 and the evaporator 24, the first cooling system 1 includes a first bypass branch 13 and a second bypass branch 14. This allows the outdoor fan 4 to drive indoor airflow through the second heat exchanger 12 without flowing through the condenser 22, and the indoor fan 3 to drive indoor airflow through the first heat exchanger 11 without flowing through the evaporator 24. This reduces the power consumption of the indoor fan 3 and the outdoor fan 4, and also reduces the air supply temperature interference caused by the overlapping placement of the two heat exchangers, thereby improving the energy efficiency of the cooling unit 100.

[0073] By connecting both the inlet and outlet of the second bypass branch 14 to the first connecting pipe, the cooling medium in the first connecting pipe can enter the second bypass branch 14, exchange heat with the cooling medium in the second circulation pipe in the condenser 22, and then return from the second bypass branch 14 to the first connecting pipe, flowing into the second heat exchanger 12 to remove the heat generated in the second circulation pipe. By connecting the inlet of the first bypass branch 13 to the first connecting pipe and the outlet of the first bypass branch 13 to the second connecting pipe, a portion of the cooling medium can exchange heat in the first heat exchanger 11 and then more quickly enter the evaporator 24 through the first bypass branch 13 for cooling before entering the first heat exchanger 11, thus improving the cooling capacity of the cooling unit 100.

[0074] By positioning the inlet of the first bypass branch 13 upstream of the inlet of the second bypass branch 14, the low-temperature cooling medium can be directly introduced into the first heat exchanger 11 after leaving the first bypass branch 13, reducing heat loss of the cooling medium during flow and improving the cooling effect of the cooling unit 100.

[0075] Reference Figure 4According to some embodiments of the present invention, the first cooling system 1 includes a first bypass branch 13, the evaporator 24 forms two heat exchange channels that are isolated from each other and exchange heat with each other, and the first bypass branch 13 is provided with a control valve 131 for controlling the opening and closing of the first bypass branch 13.

[0076] For example, when the outdoor ambient temperature is low or the cooling demand is not high, the heat exchange medium in the first circulation path can provide sufficient cooling simply by exchanging heat with the outdoor ambient temperature. In this case, the compressor 21 can be turned off and the control valve 131 can be closed. The heat exchange medium flowing out from the outlet of the first heat exchanger 11 enters the second heat exchanger 12 for heat exchange, and after leaving the second heat exchanger 12, it flows directly into the first heat exchanger 11 for heat exchange, cooling the object being cooled. In this way, the electrical energy consumed by the cooling unit 100 can be reduced while ensuring that the cooling capacity meets the demand.

[0077] For example, when the outdoor ambient temperature is high or the cooling demand is high, the heat exchange medium in the first circulation path cannot provide sufficient cooling by exchanging heat with the outdoor ambient temperature alone. At this time, the compressor 21 can be turned on and the control valve 131 can be opened. The coolant flowing out of the outlet end of the first heat exchanger 11 is divided into two paths. One path enters the first bypass branch 13, exchanges heat with the second circulation path in the evaporator 24, and then leaves the first bypass branch 13 and enters the first heat exchanger 11 to exchange heat and cool the object being cooled. The other path enters the second heat exchanger 12 to exchange heat, and after leaving the second heat exchanger 12, flows into the first heat exchanger 11 to exchange heat and cool the object being cooled.

[0078] By providing a control valve 131 on the first bypass branch 13 to control the opening and closing of the first bypass branch 13, the power consumption of the compressor 21 can be reduced while ensuring sufficient cooling capacity.

[0079] Reference Figure 4 According to some embodiments of the present invention, the first cooling system 1 includes a first bypass branch 13, the evaporator 24 forms two heat exchange channels that are isolated from each other and exchange heat with each other, the first cooling system 1 includes a cooling branch 16, the cooling branch 16 is located indoors and is arranged in parallel with the first heat exchanger 11, and the cooling branch 16 is used to dissipate heat from the cabinets indoors.

[0080] For example, the liquid-cooled cabinet 161 is equipped with a heat sink, which includes a heat dissipation channel connected in series with the cooling branch 16.

[0081] By including a cooling branch 16 in the first cooling system 1, the cooling branch 16 can dissipate heat from the indoor cabinets through liquid cooling. Liquid cooling has a better cooling effect, which can improve the cooling effect and functionality of the cooling unit 100, enabling the cooling unit 100 to meet more types of cooling needs.

[0082] Reference Figure 4 According to some embodiments of the present invention, the outlet end of the first heat exchanger 11 is connected to the inlet end of the second heat exchanger 12 through a first connecting pipe, the inlet end of the first heat exchanger 11 is connected to the outlet end of the second heat exchanger 12 through a second connecting pipe, and the first bypass branch 13 is arranged in parallel with the first heat exchanger 11.

[0083] The inlet end of the first bypass branch 13 and the outlet end of the cooling branch 16 are both connected to the first connecting pipe. The outlet end of the cooling branch 16 is located upstream of the inlet end of the first bypass branch 13. The outlet end of the first bypass branch 13 and the inlet end of the cooling branch 16 are connected to the second connecting pipe. The inlet end of the cooling branch 16 is located downstream of the outlet end of the first bypass branch 13.

[0084] By connecting the inlet end of the first bypass branch 13 and the outlet end of the cooling branch 16 to the first connecting pipe, and with the outlet end of the cooling branch 16 located upstream of the inlet end of the first bypass branch 13, the coolant flowing out of the cooling branch 16 can enter the first connecting pipe and be divided into two paths. One path enters the first bypass branch 13 and exchanges heat with the second circulation path in the evaporator 24; the other path enters the second heat exchanger 12 for heat exchange, so that the cooled medium after heat exchange is cooled down again to form a cycle.

[0085] By connecting the outlet end of the first bypass branch 13 and the inlet end of the cooling branch 16 to the second connecting pipe, with the inlet end of the cooling branch 16 located downstream of the outlet end of the first bypass branch 13, the cooling medium after heat exchange in the first bypass branch 13 and the cooling medium after heat exchange in the second connecting pipe can be combined and then divided into two paths. One path enters the first heat exchanger 11 for air cooling, and the other path enters the cooling branch 16 for liquid cooling, so as to simultaneously meet the cooling requirements of air cooling and liquid cooling.

[0086] Reference Figures 1-4 According to some embodiments of the present invention, the cooling unit 100 includes a spray system 5, which is used to spray cooling water onto the second heat exchanger 12 or to spray cooling water onto the second heat exchanger 12 and the condenser 22.

[0087] For example, the sprinkler system 5 includes a water tank 51, a sprinkler pump 52, and a sprinkler component 53.

[0088] For example, spray component 53 is used to spray cooling water onto the second heat exchanger 12.

[0089] For example, the spray component 53 is used to spray cooling water onto the second heat exchanger 12 and the condenser 22.

[0090] By including a spray system 5 in the cooling unit 100, the water sprayed by the spray system 5 falls on the second heat exchanger 12 or on the second heat exchanger 12 and the condenser 22. This water evaporates and absorbs heat, which can improve the heat exchange efficiency between the second heat exchanger 12 and the outside air.

[0091] According to a second aspect embodiment of the present invention, the cooling unit 100 is a cooling unit 100 according to a first aspect embodiment of the present invention, and the control method of the cooling unit 100 includes:

[0092] Detect outdoor ambient temperature;

[0093] Based on the current outdoor ambient temperature, control the cooling unit to 100°C.

[0094] Among them, controlling the cooling unit 100 according to the current outdoor ambient temperature includes: determining the relationship between the current outdoor ambient temperature and the second preset temperature and the third preset temperature, wherein the third preset temperature is greater than the second preset temperature;

[0095] When the outdoor ambient temperature is less than or equal to the second preset temperature, control the outdoor fan 4, indoor fan 3 and circulation pump 10 to run, and control the compressor 21 to shut down.

[0096] When the outdoor ambient temperature is greater than the second preset temperature and less than or equal to the third preset temperature, the outdoor fan 4, indoor fan 3, circulating pump 10 and compressor 21 are all controlled to run, and the compressor 21 is controlled to run at the first frequency.

[0097] When the outdoor ambient temperature is higher than the third preset temperature, the outdoor fan 4, indoor fan 3, circulating pump 10 and compressor 21 are all controlled to run, and the compressor 21 is controlled to run at the second frequency, which is higher than the first frequency.

[0098] For example, the cooling unit 100 includes a wet-bulb unit and a temperature measuring meter. The wet-bulb unit is placed in the outdoor environment, and the temperature measuring meter measures the temperature of the wet-bulb unit as the outdoor ambient temperature.

[0099] For example, both the first frequency and the second frequency are specific values, where the second frequency is greater than the first frequency.

[0100] For example, the first frequency is a range value, and the second frequency is a range value, where the minimum value in the second frequency range is greater than the maximum value in the first frequency range.

[0101] For example, when the outdoor ambient temperature is less than or equal to the second preset temperature, the outdoor fan 4, indoor fan 3, and circulating pump 10 are controlled to operate, while the compressor 21 is controlled to shut down. The coolant in the first circulating flow path is cooled in the first heat exchanger 11, and its temperature rises. It then leaves the first heat exchanger 11 and flows through the second heat exchanger 12, where it exchanges heat with the outdoor air to cool down. Finally, it flows back to the first heat exchanger 11 to form a cycle. At this time, the heat exchange medium in the first circulating flow path can provide sufficient cooling simply by exchanging heat with the outdoor ambient temperature. This reduces the electrical energy consumed by the cooling unit 100 while ensuring sufficient cooling capacity.

[0102] For example, when the outdoor ambient temperature is greater than the second preset temperature and less than or equal to the third preset temperature, the outdoor fan 4, indoor fan 3, circulating pump 10, and compressor 21 are all controlled to operate, and compressor 21 is controlled to operate at the first frequency. Part of the heat exchange medium flowing out from the outlet of the first heat exchanger 11 enters the second bypass pipe, where it exchanges heat with the second circulating flow path in the condenser 22, and then leaves the second bypass pipe to enter the second heat exchanger 12 for heat exchange; the other part enters the second heat exchanger 12 for heat exchange. The heat exchange medium in the first circulating flow path cannot provide sufficient cooling simply by exchanging heat with the outdoor ambient temperature. By turning on compressor 21 and making it operate at the first frequency, the cooling capacity can be made more sufficient, improving the cooling capacity of the cooling unit 100 and reducing the electrical energy consumed by the cooling unit 100.

[0103] For example, when the outdoor ambient temperature is higher than the third preset temperature, the outdoor fan 4, indoor fan 3, circulating pump 10, and compressor 21 are all controlled to operate, and compressor 21 is controlled to operate at a second frequency, which is higher than the first frequency. Part of the heat exchange medium flowing out of the outlet of the first heat exchanger 11 enters the second bypass pipe, where it exchanges heat with the second circulating flow path in the condenser 22, and then leaves the second bypass pipe to enter the second heat exchanger 12 for heat exchange; the other part enters the second heat exchanger 12 for heat exchange. The heat exchange medium in the first circulating flow path cannot provide sufficient cooling by only exchanging heat with the outdoor ambient temperature. By turning on compressor 21 and making it operate at the second frequency, the cooling capacity can be made more sufficient, thus improving the cooling capacity of the cooling unit 100.

[0104] According to the control method of the cooling unit 100 of the present invention, the compressor 21 can change its operating frequency according to the outdoor ambient temperature. When the outdoor environment is hot, the compressor 21 operates at the first frequency, so that the second circulation pipeline provides sufficient cooling while appropriately reducing the energy consumption of the cooling unit 100. When the outdoor environment is even hotter, the frequency of the compressor 21 is increased to increase the cooling capacity of the second circulation pipeline, so that the cooling unit 100 has sufficient cooling capacity when the outdoor environment is even hotter.

[0105] According to some embodiments of the present invention, the first frequency is a range value. Controlling the compressor 21 to operate at the first frequency includes: adjusting the frequency of the compressor 21 within the first frequency range based on the temperature difference between the actual supply air temperature and the set supply air temperature. By adjusting the frequency of the compressor 21 within the first frequency range based on the temperature difference between the actual supply air temperature and the set supply air temperature, the cooling unit 100 can provide sufficient cooling effect, and the energy consumed by the compressor 21 can be reduced, thereby reducing the energy consumption of the cooling unit 100.

[0106] According to some embodiments of the present invention, the second frequency is a range value. Controlling the compressor 21 to operate at the second frequency includes: adjusting the frequency of the compressor 21 within the second frequency range based on the temperature difference between the actual supply air temperature and the set supply air temperature. By adjusting the frequency of the compressor 21 within the second frequency range based on the temperature difference between the actual supply air temperature and the set supply air temperature, sufficient cooling effect can be provided by the cooling unit 100, and the energy consumed by the compressor 21 can be reduced, thereby reducing the energy consumption of the cooling unit 100.

[0107] According to some embodiments of the present invention, the first cooling system 1 further includes a three-way valve 15, which has a valve inlet 150, a first valve outlet 151, and a second valve outlet 152. The first connecting pipe includes a first connecting pipe section and a second connecting pipe section. One end of the first connecting pipe section is connected to the valve inlet 150, and the other end of the first connecting pipe section is connected to the outlet end of the first heat exchanger 11 or to the outlet end of the first heat exchanger 11 and the outlet end of one of the heat exchange channels of the evaporator 24. The second connecting pipe section connects the first valve outlet 151 to the inlet end of the second heat exchanger 12. The second valve outlet 152 is connected to the inlet end of the second bypass branch 14, and the outlet end of the second bypass branch 14 is connected to the second connecting pipe section. The cooling unit 100 is controlled according to the current outdoor ambient temperature. The system further includes:

[0108] When the outdoor ambient temperature is less than or equal to the second preset temperature, the first bypass branch 13 is disconnected.

[0109] When the outdoor ambient temperature is higher than the second preset temperature, the first bypass branch 13 is turned on.

[0110] For example, the cooling unit 100 includes a wet-bulb unit and a temperature measuring meter. The wet-bulb unit is placed in the outdoor environment, and the temperature measuring meter measures the temperature of the wet-bulb unit as the outdoor ambient temperature.

[0111] When the outdoor ambient temperature is less than or equal to the second preset temperature, the first bypass branch 13 is disconnected. At this time, the compressor 21 can be turned off, the first valve outlet 151 can be opened, and the second valve outlet 152 can be closed. The heat exchange medium flowing out of the outlet end of the first heat exchanger 11 enters the three-way valve 15 through the valve inlet 150, and then leaves the three-way valve 15 through the first valve outlet 151, entering the second heat exchanger 12 for heat exchange. The heat exchange medium in the first circulation path can provide sufficient cooling by exchanging heat with the outdoor ambient temperature. This can reduce the power consumption of the cooling unit 100 while ensuring sufficient cooling capacity.

[0112] When the outdoor ambient temperature exceeds a second preset temperature, the first bypass branch 13 is opened. At this time, the compressor 21 is turned on, and the first valve outlet 151 and the second valve outlet 152 are opened. The heat exchange medium flowing from the outlet of the first heat exchanger 11 enters the three-way valve 15 through the valve inlet 150. A portion of the heat exchange medium leaves the three-way valve 15 through the second valve outlet 152 and enters the second bypass pipeline, where it exchanges heat with the second circulation path in the condenser 22. It then leaves the second bypass pipeline and enters the second heat exchanger 12 for further heat exchange. The other portion of the heat exchange medium leaves the three-way valve 15 through the first valve outlet 151 and enters the second heat exchanger 12 for further heat exchange. The heat exchange medium in the first circulation path cannot provide sufficient cooling simply by exchanging heat with the outdoor ambient temperature; this design allows for more adequate cooling, thus improving the cooling capacity of the cooling unit 100.

[0113] According to some embodiments of the present invention, the cooling unit 100 includes a spray system 5, which is used to spray cooling water onto the second heat exchanger 12 or to spray cooling water onto both the second heat exchanger 12 and the condenser 22. The cooling unit 100 is controlled according to the current outdoor ambient temperature and further includes:

[0114] Determine the relationship between the current outdoor ambient temperature and the first preset temperature and the second preset temperature, where the first preset temperature is lower than the second preset temperature;

[0115] When the outdoor ambient temperature is greater than the first preset temperature and less than or equal to the second preset temperature, the outdoor fan 4, indoor fan 3, circulating pump 10 and sprinkler system 5 are controlled to operate, and the compressor 21 is controlled to shut down.

[0116] When the outdoor ambient temperature is less than or equal to the first preset temperature, control the outdoor fan 4, indoor fan 3 and circulating pump 10 to run, and control the compressor 21 and spray system 5 to shut down.

[0117] For example, the cooling unit 100 includes a dry bulb and a temperature measuring meter. The dry bulb is placed in the outdoor environment, and the temperature measuring meter measures the temperature of the dry bulb as the outdoor ambient temperature.

[0118] When the outdoor ambient temperature is greater than the first preset temperature and less than or equal to the second preset temperature, the heat exchange medium in the first circulation path cannot provide sufficient cooling simply by exchanging heat with the outdoor ambient temperature. By controlling the operation of the outdoor fan 4, indoor fan 3, circulation pump 10 and spray system 5, and controlling the compressor 21 to shut down, the spray system 5 sprays spray water to the vicinity of the second heat exchanger 12. The spray water evaporates and absorbs heat, which can accelerate the heat dissipation speed of the cooling medium in the second heat exchanger 12 and more fully reduce the temperature of the cooling medium leaving the second heat exchanger 12. This allows the cooling medium to provide more sufficient cooling in the first heat exchanger 11. Furthermore, compared to turning on the compressor 21, turning on the spray system 5 requires less energy, which can reduce the electrical energy consumed by the cooling unit 100 while ensuring sufficient cooling capacity.

[0119] When the outdoor ambient temperature is less than or equal to the first preset temperature, the heat exchange medium in the first circulation path can provide sufficient cooling simply by exchanging heat with the outdoor ambient temperature. By controlling the operation of the outdoor fan 4, the indoor fan 3 and the circulation pump 10, and controlling the compressor 21 and the spray system 5 to shut down, the power consumption of the cooling unit 100 can be reduced while ensuring sufficient cooling capacity.

[0120] The following reference Figure 1 A cooling unit 100 according to some specific embodiments of the present invention is described.

[0121] Reference Figure 1 In this embodiment, the cooling unit 100 includes: a first cooling system 1, a second cooling system 2, an outdoor fan 4, and an indoor fan 3.

[0122] The first cooling system 1 includes a circulating pump 10, a first heat exchanger 11, and a second heat exchanger 12. The circulating pump 10, the first heat exchanger 11, and the second heat exchanger 12 are connected in sequence to form a first circulating flow path. The first heat exchanger 11 is located indoors, and the second heat exchanger 12 is located outdoors. The first cooling system 1 also includes a second bypass branch 14, which is connected to the first circulating flow path.

[0123] The second cooling system 2 includes a compressor 21, a condenser 22, a throttling device 23, and an evaporator 24. The compressor 21, condenser 22, throttling device 23, and evaporator 24 are connected in sequence to form a second circulation path. The condenser 22 has two heat exchange channels that are isolated from each other but exchange heat with each other. One heat exchange channel of the condenser 22 constitutes part of the second circulation path, and the other heat exchange channel of the condenser 22 constitutes part of the second bypass branch 14.

[0124] An indoor fan 3 is located indoors and drives indoor air to flow through the first heat exchanger 11 and the evaporator 24. The evaporator 24 is a tube-fin heat exchanger or a microchannel heat exchanger, and is located upstream of the first heat exchanger 11 in the direction of indoor airflow. The condenser 22 is a plate heat exchanger.

[0125] The first cooling system 1 includes a second bypass branch 14. The condenser 22 forms two heat exchange channels that are isolated from each other but exchange heat with each other. The first cooling system 1 includes a second bypass branch 14. The outlet end of the first heat exchanger 11 and the inlet end of the second heat exchanger 12 are connected through a first connecting pipe. The inlet end and the outlet end of the second bypass branch 14 are both connected to the first connecting pipe.

[0126] The first cooling system 1 also includes a three-way valve 15, which has a valve inlet 150, a first valve outlet 151, and a second valve outlet 152. The first connecting pipe includes a first connecting pipe section and a second connecting pipe section. One end of the first connecting pipe section is connected to the valve inlet 150, and the other end of the first connecting pipe section is connected to the outlet end of the first heat exchanger 11. The second connecting pipe section connects the first valve outlet 151 to the inlet end of the second heat exchanger 12. The second valve outlet 152 is connected to the inlet end of the second bypass branch 14, and the outlet end of the second bypass branch 14 is connected to the second connecting pipe section.

[0127] The cooling unit 100 includes a spray system 5, which is used to spray cooling water onto the second heat exchanger 12 or to spray cooling water onto the second heat exchanger 12 and the condenser 22.

[0128] The following reference Figure 2 A cooling unit 100 according to other specific embodiments of the present invention is described.

[0129] In this embodiment, the cooling unit 100 includes: a first cooling system 1, a second cooling system 2, an outdoor fan 4, and an indoor fan 3.

[0130] The first cooling system 1 includes a circulating pump 10, a first heat exchanger 11, and a second heat exchanger 12. The circulating pump 10, the first heat exchanger 11, and the second heat exchanger 12 are connected in sequence to form a first circulating flow path. The first heat exchanger 11 is located indoors, and the second heat exchanger 12 is located outdoors. The first cooling system 1 also includes a first bypass branch 13 and a second bypass branch 14. Both the first bypass branch 13 and the second bypass branch 14 are connected to the first circulating flow path.

[0131] The second cooling system 2 includes a compressor 21, a condenser 22, a throttling component 23, and an evaporator 24. The compressor 21, condenser 22, throttling component 23, and evaporator 24 are connected in sequence to form a second circulation path. Both the condenser 22 and the evaporator 24 have two heat exchange channels that are isolated from each other but exchange heat with each other. One heat exchange channel of the evaporator 24 constitutes part of the second circulation path, and the other heat exchange channel of the evaporator 24 constitutes part of the first bypass branch 13. One heat exchange channel of the condenser 22 constitutes part of the second circulation path, and the other heat exchange channel of the condenser 22 constitutes part of the second bypass branch 14.

[0132] The indoor fan 3 is located indoors and is used to drive indoor air to flow through the first heat exchanger 11, while the outdoor fan 4 is located outdoors and is used to drive outdoor air to flow through the second heat exchanger 12.

[0133] The evaporator 24 has two heat exchange channels that are isolated from each other but exchange heat with each other. The indoor fan 3 drives indoor air to flow through the first heat exchanger 11. The condenser 22 has two heat exchange channels that are isolated from each other but exchange heat with each other. The outdoor fan 4 drives outdoor air to flow through the second heat exchanger 12. Both the evaporator 24 and the condenser 22 are plate heat exchangers.

[0134] The condenser 22 has two heat exchange channels that are isolated from each other and exchange heat with each other. The first cooling system 1 includes a second bypass branch 14. The outlet end of the first heat exchanger 11 and the inlet end of the second heat exchanger 12 are connected through a first connecting pipe. The inlet end and the outlet end of the second bypass branch 14 are both connected to the first connecting pipe.

[0135] The first cooling system 1 also includes a three-way valve 15, which has a valve inlet 150, a first valve outlet 151, and a second valve outlet 152. The outlet end of the first heat exchanger 11 and the outlet end of the heat exchange channel of the evaporator 24 are both connected to the valve inlet 150. The first valve outlet 151 is connected to the inlet end of the second heat exchanger 12, and the second valve outlet 152 is connected to the inlet end of the second bypass branch 14. The first bypass branch 13 is arranged in parallel with the first heat exchanger 11.

[0136] The outlet end of the first heat exchanger 11 is connected to the inlet end of the second heat exchanger 12 through a first connecting pipe, and the inlet end of the first heat exchanger 11 is connected to the outlet end of the second heat exchanger 12 through a second connecting pipe. The condenser 22 and the evaporator 24 each form two heat exchange channels that are isolated from each other and exchange heat with each other. The first cooling system 1 includes a first bypass branch 13 and a second bypass branch 14.

[0137] The inlet and outlet of the second bypass branch 14 are both connected to the first connecting pipeline. The inlet of the first bypass branch 13 is connected to the first connecting pipeline, and the outlet of the first bypass branch 13 is connected to the second connecting pipeline. The inlet of the first bypass branch 13 is located upstream of the inlet of the second bypass branch 14. A control valve 131 for controlling the on / off state of the first bypass branch 13 is provided on the first bypass branch 13.

[0138] The evaporator 24 has two heat exchange channels that are isolated from each other and exchange heat with each other. The first cooling system 1 includes a cooling branch 16, which is located indoors and is connected in parallel with the first heat exchanger 11. The cooling branch 16 is used to dissipate heat from the cabinets indoors.

[0139] The inlet end of the first bypass branch 13 and the outlet end of the cooling branch 16 are both connected to the first connecting pipe. The outlet end of the cooling branch 16 is located upstream of the inlet end of the first bypass branch 13. The outlet end of the first bypass branch 13 and the inlet end of the cooling branch 16 are connected to the second connecting pipe. The inlet end of the cooling branch 16 is located downstream of the outlet end of the first bypass branch 13.

[0140] The cooling unit 100 includes a spray system 5, which is used to spray cooling water onto the second heat exchanger 12 or to spray cooling water onto the second heat exchanger 12 and the condenser 22.

[0141] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0142] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0143] In the description of this invention, "a plurality of" means two or more.

[0144] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0145] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0146] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0147] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A cooling unit, characterized in that, include: The first cooling system includes a circulating pump, a first heat exchanger, and a second heat exchanger. The circulating pump, the first heat exchanger, and the second heat exchanger are connected in sequence to form a first circulating flow path. The first heat exchanger is located indoors, and the second heat exchanger is located outdoors. The first cooling system also includes at least one of a first bypass branch and a second bypass branch. Both the first bypass branch and the second bypass branch are connected to the first circulating flow path. The second cooling system includes a compressor, a condenser, a throttling device, and an evaporator. The compressor, the condenser, the throttling device, and the evaporator are connected in sequence to form a second circulation path. At least one of the condenser and the evaporator has two heat exchange channels that are isolated from each other but exchange heat with each other. When the evaporator has two heat exchange channels, one heat exchange channel of the evaporator constitutes part of the second circulation path and the other heat exchange channel of the evaporator constitutes part of the first bypass branch. When the condenser has two heat exchange channels, one heat exchange channel of the condenser constitutes part of the second circulation path and the other heat exchange channel of the condenser constitutes part of the second bypass branch. An indoor fan is located indoors and is used to drive indoor air to flow through the first heat exchanger or through the first heat exchanger and the evaporator; An outdoor fan is located outdoors and is used to drive outdoor air to flow through the second heat exchanger or through the second heat exchanger and the condenser.

2. The cooling unit according to claim 1, characterized in that, The first cooling system includes the first bypass branch, the evaporator forms two heat exchange channels that are isolated from each other and exchange heat with each other, the indoor fan is used to drive indoor air to flow through the first heat exchanger, and the condenser is a tube-fin heat exchanger or a microchannel heat exchanger.

3. The cooling unit according to claim 2, characterized in that, In the direction of outdoor airflow, the condenser is located upstream of the second heat exchanger.

4. The cooling unit according to claim 1, characterized in that, The first cooling system includes the second bypass branch, the condenser forms two heat exchange channels that are isolated from each other and exchange heat with each other, the outdoor fan is used to drive outdoor air to flow through the second heat exchanger, and the evaporator is a tube-fin heat exchanger or a microchannel heat exchanger.

5. The cooling unit according to claim 4, characterized in that, In the direction of airflow within the room, the evaporator is located downstream of the first heat exchanger.

6. The cooling unit according to claim 1, characterized in that, At least one of the condenser and the evaporator is a plate heat exchanger; and / or, the first cooling system includes a first bypass branch and a second bypass branch, and both the condenser and the evaporator form two heat exchange channels that are isolated from each other and exchange heat with each other.

7. The cooling unit according to claim 1, characterized in that, The first cooling system includes a second bypass branch, and the condenser forms two heat exchange channels that are isolated from each other and exchange heat with each other. The first cooling system includes a second bypass branch, and the outlet end of the first heat exchanger and the inlet end of the second heat exchanger are connected through a first connecting pipe. The inlet end of the second bypass branch and the outlet end of the second bypass branch are both connected to the first connecting pipe.

8. The cooling unit according to claim 7, characterized in that, The first cooling system further includes a three-way valve having a valve inlet, a first valve outlet, and a second valve outlet. The first connecting pipe includes a first connecting pipe section and a second connecting pipe section. One end of the first connecting pipe section is connected to the valve inlet, and the other end of the first connecting pipe section is connected to the outlet end of the first heat exchanger or to the outlet end of the first heat exchanger and the outlet end of one of the heat exchange channels of the evaporator. The second connecting pipe section connects the first valve outlet to the inlet end of the second heat exchanger. The second valve outlet is connected to the inlet end of the second bypass branch, and the outlet end of the second bypass branch is connected to the second connecting pipe section.

9. The cooling unit according to claim 1, characterized in that, The first cooling system includes the first bypass branch, which is connected in parallel with the first heat exchanger.

10. The cooling unit according to claim 9, characterized in that, The outlet end of the first heat exchanger is connected to the inlet end of the second heat exchanger through a first connecting pipe, and the inlet end of the first heat exchanger is connected to the outlet end of the second heat exchanger through a second connecting pipe. The first cooling system includes a first bypass branch and a second bypass branch. The condenser and the evaporator each form two heat exchange channels that are isolated from each other and exchange heat with each other. The inlet and outlet of the second bypass branch are both connected to the first connecting pipeline. The inlet of the first bypass branch is connected to the first connecting pipeline, and the outlet of the first bypass branch is connected to the second connecting pipeline. The inlet of the first bypass branch is located upstream of the inlet of the second bypass branch.

11. The cooling unit according to claim 1, characterized in that, The first cooling system includes the first bypass branch, the evaporator forms two heat exchange channels that are isolated from each other but exchange heat with each other, and the first bypass branch is provided with a control valve for controlling the opening and closing of the first bypass branch.

12. The cooling unit according to claim 1, characterized in that, The first cooling system includes the first bypass branch, the evaporator forms two heat exchange channels that are isolated from each other and exchange heat with each other, the first cooling system includes a cooling branch, the cooling branch is located indoors and is arranged in parallel with the first heat exchanger, and the cooling branch is used to dissipate heat from the cabinets indoors.

13. The cooling unit according to claim 12, characterized in that, The outlet end of the first heat exchanger is connected to the inlet end of the second heat exchanger via a first connecting pipe, and the inlet end of the first heat exchanger is connected to the outlet end of the second heat exchanger via a second connecting pipe. The first bypass branch is arranged in parallel with the first heat exchanger. The inlet end of the first bypass branch and the outlet end of the cooling branch are both connected to the first connecting pipe. The outlet end of the cooling branch is located upstream of the inlet end of the first bypass branch. The outlet end of the first bypass branch and the inlet end of the cooling branch are connected to the second connecting pipe. The inlet end of the cooling branch is located downstream of the outlet end of the first bypass branch.

14. The cooling unit according to any one of claims 1-13, characterized in that, Includes a spray system for spraying cooling water onto the second heat exchanger or for spraying cooling water onto both the second heat exchanger and the condenser.

15. A control method for a cooling unit, characterized in that, The cooling unit is a cooling unit according to any one of claims 1-13, and the control method of the cooling unit includes: Detect outdoor ambient temperature; The cooling unit is controlled according to the current outdoor ambient temperature; Controlling the cooling unit based on the current outdoor ambient temperature includes: Determine the relationship between the current outdoor ambient temperature and the second preset temperature and the third preset temperature, wherein the third preset temperature is greater than the second preset temperature; When the outdoor ambient temperature is less than or equal to the second preset temperature, the outdoor fan, indoor fan, and circulation pump are controlled to operate, and the compressor is controlled to shut down. When the outdoor ambient temperature is greater than the second preset temperature and less than or equal to the third preset temperature, the outdoor fan, the indoor fan, the circulating pump, and the compressor are all controlled to run, and the compressor is controlled to run at a first frequency. When the outdoor ambient temperature is greater than the third preset temperature, the outdoor fan, the indoor fan, the circulating pump, and the compressor are all controlled to run, and the compressor is controlled to run at a second frequency, which is greater than the first frequency.

16. The control method for the cooling unit according to claim 15, characterized in that, The first frequency is a range value. Controlling the compressor to operate at the first frequency includes: adjusting the frequency of the compressor within the first frequency range according to the temperature difference between the actual air supply temperature and the set air supply temperature. And / or, the second frequency is a range value, controlling the compressor to operate at the second frequency includes: adjusting the frequency of the compressor within the second frequency range according to the temperature difference between the actual air supply temperature and the set air supply temperature.

17. The control method for the cooling unit according to claim 15, characterized in that, The cooling unit includes a spray system for spraying cooling water onto the second heat exchanger or for spraying cooling water onto both the second heat exchanger and the condenser. The cooling unit is controlled according to the current outdoor ambient temperature and further includes: Determine the relationship between the current outdoor ambient temperature and the first preset temperature and the second preset temperature, wherein the first preset temperature is less than the second preset temperature; When the outdoor ambient temperature is greater than the first preset temperature and less than or equal to the second preset temperature, the outdoor fan, the indoor fan, the circulating pump, and the sprinkler system are controlled to operate, and the compressor is controlled to shut down. When the outdoor ambient temperature is less than or equal to the first preset temperature, the outdoor fan, the indoor fan, and the circulating pump are controlled to operate, while the compressor and the sprinkler system are controlled to shut down.

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