Dry cooler, computer room air conditioning system and control method thereof

Abstract

This invention provides a dry cooler, a computer room air conditioning system, and a control method thereof. The dry cooler includes: a mounting frame with an accommodating space within it; a drive fan positioned at the top of the accommodating space; and a heat exchanger positioned within the accommodating space and at the air inlet side of the drive fan. The accommodating space has a bottom air vent at the bottom of the mounting frame and a side air vent on the side surface of the mounting frame. The heat exchanger is correspondingly positioned to the side air vents. A first damper is provided at the bottom side air vent, and a second damper is provided at the side air vent. The first damper has a bottom ventilation state and a bottom closed state, and the second damper has a side ventilation state and a side closed state. The first and second dampers can be independently controlled and switched. This invention enables the dry cooler to utilize the chimney effect for natural heat dissipation from the heat exchanger when the outdoor ambient temperature is low, eliminating the need for power to drive the fan, thus saving energy and reducing consumption.

Description

Technical Field

[0001] This invention belongs to the field of air conditioning technology, specifically relating to a dry cooler, a computer room air conditioning system, and its control method. Background Technology

[0002] The rapid development of the information industry and digital construction has driven a rapid increase in the number and scale of computer rooms and base stations. Statistics show that air conditioning in computer rooms and base stations accounts for more than 40% of their total energy consumption. When the distance between the outdoor and indoor units of a computer room air conditioner is too large, using an air-cooled condenser presents problems such as long refrigerant pipes, significant pressure loss during transport, and difficulty in refrigerant oil return. To overcome these shortcomings of existing technologies, related technologies employ dry coolers in computer room air conditioning systems to overcome the deficiencies of air-cooled condensers that utilize refrigerant. Dry coolers in these technologies typically achieve forced convection cooling of the internal heat exchanger by rotating a drive fan mounted on top of the dry cooler. This cooling method is used even when the outdoor ambient temperature is low, resulting in high energy consumption and poor energy efficiency and environmental friendliness of the air conditioning system. Summary of the Invention

[0003] Therefore, the present invention provides a dry cooler, a computer room air conditioning system and its control method, which can solve the technical problems of high energy consumption and poor energy saving and environmental protection in the existing technology of dry coolers in computer room air conditioning systems that use a single forced convection heat dissipation method.

[0004] To address the above problems, the present invention provides a dry cooler, comprising:

[0005] Mounting frame, wherein an accommodating space is formed within the mounting frame;

[0006] A drive fan is positioned at the top of the accommodating space;

[0007] The heat exchanger is placed within the accommodating space and is located on the air inlet side of the driving fan;

[0008] The accommodating space has a bottom air vent at the bottom of the mounting frame and a side air vent on the side facade of the mounting frame. The heat exchanger is arranged correspondingly to the side air vent. A first air damper is provided at the bottom air vent, and a second air damper is provided at the side air vent. The first air damper has a bottom ventilation state and a bottom closed state, and the second air damper has a side ventilation state and a side closed state. The first air damper and the second air damper can be independently controlled to switch states.

[0009] In some implementations...

[0010] The first damper includes multiple controllable rotating door panels, the rotation angle of which can be controlled to change to achieve a gradual switch from the bottom ventilation state to the bottom closed state; and / or,

[0011] The second damper includes multiple controllable rotating door panels, the rotation angle of which can be controlled to change to achieve a gradual switch from the side ventilation state to the side closed state.

[0012] In some implementations...

[0013] The heat exchanger includes a first heat exchanger and a second heat exchanger, which are arranged at intervals relative to each other. There are two side air vents, each of which is respectively arranged corresponding to the first heat exchanger and the second heat exchanger. The drive fan is located between the first heat exchanger and the second heat exchanger.

[0014] In some implementations...

[0015] The minimum horizontal distance between the top ends of the first heat exchanger and the second heat exchanger is greater than the minimum horizontal distance between the bottom ends of the first heat exchanger and the second heat exchanger, and the bottom ends of the first heat exchanger and the second heat exchanger are within the coverage area of ​​the bottom side air vent.

[0016] In some implementations...

[0017] The bottom air vent has a first symmetrical plane in the vertical direction. The first heat exchanger and the second heat exchanger are symmetrical about the first symmetrical plane. The minimum horizontal distance between the bottom ends of the first heat exchanger and the second heat exchanger is L. The distance between the two side frames of the bottom air vent that are symmetrical about the first symmetrical plane is S. S / 6≤L≤S / 4.

[0018] The present invention also provides a computer room air conditioning system, including a dry cooler, wherein the dry cooler is the dry cooler described above.

[0019] In some embodiments, the computer room air conditioning system further includes:

[0020] The water-cooled circulation subsystem includes a surface cooler capable of forming a water circulation system, the dry cooler, and a water pump;

[0021] The refrigerant cycle subsystem includes a compressor, a water-cooled condenser, a throttling element, and an evaporator that can form a refrigerant cycle;

[0022] The cooling water flowing out of the dry cooler can be controlled to flow into the water-cooled condenser and / or the surface cooler.

[0023] In some implementations...

[0024] The outlet of the dry cooler, the inlet of the water-cooled condenser, and the inlet of the surface cooler are all connected at a first point. A first on / off valve is connected in series on the pipeline between the first point and the inlet of the surface cooler, and a second on / off valve is connected in series on the pipeline between the first point and the inlet of the water-cooled condenser. The outlet of the water pump is connected to the inlet of the dry cooler. The inlet of the water pump, the outlet of the water-cooled condenser, and the outlet of the surface cooler are all connected at a second point. A third on / off valve is connected in series on the pipeline between the second point and the outlet of the water-cooled condenser, and a fourth on / off valve is connected in series on the pipeline between the second point and the outlet of the surface cooler.

[0025] The present invention also provides a control method for a computer room air conditioning system as described above, comprising:

[0026] Obtain the operating mode of the computer room air conditioning system;

[0027] The on / off state of the first on / off valve, the second on / off valve, the third on / off valve and the fourth on / off valve, as well as the start and stop of the compressor and / or water pump are controlled according to the obtained operating mode.

[0028] In some implementations...

[0029] When the operating mode is water cooling mode, the first and fourth on / off valves are opened, the second and third on / off valves are closed, and the water pump is started and the compressor is stopped; or...

[0030] When the operating mode is the mixed cooling mode, the first on / off valve, the fourth on / off valve, the second on / off valve, and the third on / off valve are controlled to open, and the water pump is controlled to start operating, and the compressor is controlled to start operating at a first frequency; or,

[0031] When the operating mode is refrigerant cooling mode, the first on / off valve and the fourth on / off valve are shut off, while the second on / off valve and the third on / off valve are opened, thereby stopping the water pump and controlling the compressor to start operating at a second frequency, which is higher than the first frequency.

[0032] In some embodiments, during the operation of the computer room air conditioning system in water cooling mode or hybrid cooling mode, the control method further includes:

[0033] Obtain the outdoor ambient temperature;

[0034] The state switching of the first and second dampers and the start and stop of the drive fan are controlled according to the temperature range of the outdoor ambient temperature.

[0035] In some implementations...

[0036] When the outdoor ambient temperature is within a first temperature range, the first damper is controlled to be in a bottom-closed state, the second damper is in a side-ventilation state, and the drive fan is controlled to start operating at a first speed, so that the dry cooler is in a forced heat dissipation state; or...

[0037] When the outdoor ambient temperature is within the second temperature range, the first damper is controlled to be in bottom ventilation mode and the second damper to be in side ventilation mode, and the drive fan is controlled to start operating at a second speed, so that the dry cooler is in a mixed heat dissipation state, where the second speed is lower than the first speed; or...

[0038] When the outdoor ambient temperature is in the third temperature range, the first damper is controlled to be in the bottom ventilation state, the second damper is controlled to be in the side closed state, and the drive fan is controlled to stop running, so that the dry cooler is in the chimney effect heat dissipation state.

[0039] The lower limit of the first temperature range is higher than the upper limit of the second temperature range, and the lower limit of the second temperature range is higher than the upper limit of the third temperature range.

[0040] In some implementations...

[0041] When the dry cooler is in the forced cooling state, the higher the indoor return air temperature of the computer room air conditioning system is above the target set value, the higher the first rotation speed and the larger the ventilation area of ​​the second damper; conversely, the lower the indoor return air temperature is below the target set value, the lower the first rotation speed and the smaller the ventilation area of ​​the second damper; or...

[0042] When the dry cooler is in the mixed heat dissipation state, the higher the indoor return air temperature of the computer room air conditioning system is above the target set value, the higher the second rotation speed and the larger the ventilation area of ​​the first and second air dampers; conversely, the lower the indoor return air temperature is below the target set value, the lower the second rotation speed and the smaller the ventilation area of ​​the first and second air dampers; or...

[0043] When the dry cooler is in the chimney effect heat dissipation state, the greater the indoor return air temperature of the computer room air conditioning system is above the target set value, the larger the ventilation area of ​​the first air damper; the greater the indoor return air temperature is below the target set value, the smaller the ventilation area of ​​the first air damper.

[0044] The present invention provides a dry cooler, a computer room air conditioning system, and a control method thereof, which have the following beneficial effects:

[0045] By installing a bottom-side air vent at the bottom of the mounting bracket and a first damper that can be controlled to open and close, and a second damper that can be controlled to open and close on the air inlet side of the heat exchanger, selective control of the opening and closing of the bottom-side air vent and the side air vent is achieved. This allows the dry cooler to utilize the chimney effect for natural heat dissipation of the heat exchanger when the outdoor ambient temperature is low, eliminating the need for power to drive the fan, thus saving energy and reducing consumption. When the outdoor ambient temperature is high, the dry cooler can utilize the airflow driving capability of the fan to force heat dissipation of the heat exchanger, ensuring the heat dissipation effect of the dry cooler and thus ensuring the stability of the corresponding indoor temperature. Attached Figure Description

[0046] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0047] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0048] Figure 1 This is a front view of a dry cooler according to an embodiment of the present invention;

[0049] Figure 2 for Figure 1 A bottom view;

[0050] Figure 3 for Figure 1 Top view;

[0051] Figure 4 for Figure 1 Side view of the dry cooler;

[0052] Figure 5 for Figure 4 Cross-sectional view of the dry cooler in the middle;

[0053] Figure 6 This is a schematic diagram of the structure of a dry cooler according to an embodiment of the present invention. The arrows in the diagram indicate the direction of airflow, and the dry cooler in the diagram is in a mixed heat dissipation state.

[0054] Figure 7 This is a schematic diagram of the computer room air conditioning system according to an embodiment of the present invention.

[0055] The reference numerals in the attached figures are as follows:

[0056] 1. Mounting rack; 11. Accommodation space;

[0057] 21. First heat exchanger; 22. Second heat exchanger;

[0058] 3. Drive the fan;

[0059] 41. First air damper; 42. Second air damper; 43. Door panel;

[0060] 100. Dry cooler; 101. Surface cooler; 102. Water pump;

[0061] 201. Compressor; 202. Water-cooled condenser; 203. Throttling element; 204. Evaporator;

[0062] 31. First shut-off valve; 32. Second shut-off valve; 33. Third shut-off valve; 34. Fourth shut-off valve. Detailed Implementation

[0063] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0064] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0065] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0066] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0067] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0068] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0069] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0070] See also Figure 1and Figure 7 As shown, according to an embodiment of the present invention, a dry cooler is provided, comprising:

[0071] Mounting frame 1, wherein an accommodating space 11 is formed within the mounting frame 1;

[0072] The drive fan 3 is placed on top of the accommodating space 11 so that the dry cooler can be in a forced heat dissipation state during operation. The aforementioned top can be the top of the inner side of the accommodating space 11 or the top of the outer side of the accommodating space 11, without any particular limitation.

[0073] The heat exchanger (not labeled in the figure) is placed in the accommodating space 11 and is located on the air inlet side of the driving fan 3. That is, the airflow driven by the driving fan 3 can flow through the heat exchange core of the heat exchanger to achieve the purpose of air cooling. It is understood that as a heat exchanger used in a dry cooler, the cooling medium inside is water, rather than a refrigerant.

[0074] The accommodating space 11 has a bottom side air vent (not shown in the figure) at the bottom of the mounting frame 1 and a side air vent (not shown in the figure) on the side facade of the mounting frame 1. The heat exchanger is correspondingly arranged with the side air vents. A first damper 41 is provided at the bottom side air vent, and a second damper 42 is provided at the side air vent. The first damper 41 has a bottom ventilation state and a bottom closed state, and the second damper 42 has a side ventilation state and a side closed state. The first damper 41 and the second damper 42 can be independently controlled to switch states. Specifically, when the second damper 42 is in a bottom ventilation state... When the side is closed and the first damper 41 is in the bottom ventilation state, the drive fan 3 can be stopped, thus utilizing the chimney effect to achieve natural heat dissipation of the heat exchanger and save energy consumption. This state is suitable for situations where the outdoor ambient temperature is low. When the outdoor ambient temperature is high, the drive fan 3 can be controlled to start running. Correspondingly, the second damper 42 is controlled to open (i.e., the aforementioned side ventilation state), and the first damper 41 can be controlled to close (i.e., in the aforementioned bottom closed state). This can achieve forced heat dissipation of the heat exchanger and improve efficient cooling under high ambient temperature.

[0075] In this technical solution, by setting a bottom side air vent at the bottom of the mounting frame 1 and setting a first air damper 41 that can be controlled to open and close, and setting a second air damper 42 that can be controlled to open and close on the air inlet side of the heat exchanger, selective control of the opening and closing of the bottom side air vent and the side air vent is realized. In this way, the dry cooler can use the chimney effect to naturally dissipate heat from the heat exchanger when the outdoor ambient temperature is low, without the need to supply power to drive the fan 3, thus saving energy and reducing consumption; and the dry cooler can use the airflow driving capability of the drive fan 3 to force heat dissipation from the heat exchanger when the outdoor ambient temperature is high, ensuring the heat dissipation effect of the dry cooler, and thus ensuring the stability of the corresponding indoor temperature.

[0076] In a preferred embodiment, the first damper 41 includes multiple controllable rotatable door panels 43, the rotation angle of which can be controlled to change to achieve a gradual switch from the bottom ventilation state to the bottom closed state; and / or, the second damper 42 includes multiple controllable rotatable door panels 43, the rotation angle of which can be controlled to change to achieve a gradual switch from the side ventilation state to the side closed state. That is, the first damper 41 and the second damper 42 can be implemented in the same way (though their sizes may differ), both using the rotation of multiple door panels 43 to switch the damper's on / off state. The overlapping or separation of the corresponding edges of the multiple door panels 43 achieves full coverage or partial unobstructed access to the ventilation opening, reducing the space required for damper state switching and thus making the overall space occupied by the dryer / cooler smaller. It is understood that for the same damper, multiple door panels 43 are simultaneously driven in parallel by a connecting rod, and the corresponding drive motor can drive the linear reciprocating motion of the connecting rod, thereby achieving synchronous opening and closing of each door panel 43. Specifically, the first damper 41 and the second damper 42 in this invention are structurally similar to a louver structure.

[0077] In a preferred embodiment, the heat exchanger includes a first heat exchanger 21 and a second heat exchanger 22, which are arranged relatively apart. There are two side air vents, each corresponding to the first heat exchanger 21 and the second heat exchanger 22 respectively. The drive fan 3 is located between the first heat exchanger 21 and the second heat exchanger 22. In a preferred embodiment, at least two drive fans 3 can also be configured, arranged in a line and located in the top area between the first heat exchanger 21 and the second heat exchanger 22. This technical solution improves the heat exchange capacity of the dry cooler by setting two relatively spaced-apart first heat exchangers 21 and second heat exchangers 22, while reducing the overall height of the dry cooler, facilitating assembly and after-sales maintenance. It is understood that the aforementioned second damper 42 also has two sets, each set located on the air inlet side of the first heat exchanger 21 and the second heat exchanger 22 respectively.

[0078] In some embodiments, the minimum horizontal distance between the top ends of the first heat exchanger 21 and the second heat exchanger 22 is greater than the minimum horizontal distance between their bottom ends. This results in the first heat exchanger 21 and the second heat exchanger 22 forming a roughly V-shaped opposing structure, which further increases the heat exchange area of ​​each heat exchanger while maintaining a fixed dry cooler height. The bottom ends of the first heat exchanger 21 and the second heat exchanger 22 are within the coverage area of ​​the bottom air vent. In this technical solution, since the bottom ends of the first heat exchanger 21 and the second heat exchanger 22 are within the coverage area of ​​the bottom air vent, that is, there is a corresponding gap between the bottom air vent and the air inlet side of the first heat exchanger 21 and the second heat exchanger 22, when the first air damper 41 is in the bottom ventilation state, the bottom airflow can pass through at least partially through the heat exchange core of the first heat exchanger 21 and the second heat exchanger 22 under the effect of the chimney effect, ensuring the natural heat dissipation effect of the chimney effect.

[0079] It should be noted that, in order to ensure the chimney effect of the dry cooler, theoretically, the vertical height of the first heat exchanger 21 and the second heat exchanger 22 in the installed and used state should not be less than 1m. It should be noted that the aforementioned height does not correspond to the length of the heat exchanger.

[0080] In a preferred embodiment, to further enhance the natural heat dissipation effect brought about by the chimney effect, the bottom air vent has a first symmetrical plane in the vertical direction. The first heat exchanger 21 and the second heat exchanger 22 are symmetrical about the first symmetrical plane. The minimum horizontal distance between the bottom ends of the first heat exchanger 21 and the second heat exchanger 22 is L, and the distance between the two side frames of the bottom air vent symmetrical about the first symmetrical plane is S, where S / 6≤L≤S / 4. This ensures that the air entering through the bottom air vent can flow more through the heat exchange cores of the first heat exchanger 21 and the second heat exchanger 22. At the same time, it also ensures that some air can enter the area between the first heat exchanger 21 and the second heat exchanger 22, so as to utilize this lower-temperature air that has not been heat-exchanged by the heat exchange cores to efficiently cool the heat exchange cores on the air outlet side of the first heat exchanger 21 and the second heat exchanger 22.

[0081] According to embodiments of the present invention, such as Figure 7As shown, a computer room air conditioning system is also provided, including a dry cooler 100, which is the dry cooler described above. Specifically, the computer room air conditioning system further includes: a water-cooled circulation subsystem, including a surface cooler 101 capable of forming water circulation, the dry cooler 100, and a water pump 102; a refrigerant circulation subsystem, including a compressor 201 capable of forming refrigerant circulation, a water-cooled condenser 202, a throttling element 203, and an evaporator 204; the cooling water flowing out of the dry cooler 100 can be controlled to flow into the water-cooled condenser 202 and / or the surface cooler 101.

[0082] In this technical solution, the computer room air conditioning system has a refrigerant circulation subsystem and a water cooling circulation subsystem, and the two subsystems may form a heat exchange coupling through the water cooling condenser 202. This allows the computer room air conditioning system of the present invention to select one subsystem to operate or to operate both subsystems simultaneously according to the actual situation, thereby improving the cooling performance of the computer room air conditioning system while reducing system operating energy consumption and making it more energy-efficient and environmentally friendly.

[0083] In one specific embodiment, the outlet of the dry cooler 100, the inlet of the water-cooled condenser 202, and the inlet of the surface cooler 101 are all connected to a first point. A first on / off valve 31 is connected in series on the pipeline between the first point and the inlet of the surface cooler 101, and a second on / off valve 32 is connected in series on the pipeline between the first point and the inlet of the water-cooled condenser 202. The outlet of the water pump 102 is connected to the inlet of the dry cooler 100. The inlet of the water pump 102, the outlet of the water-cooled condenser 202, and the outlet of the surface cooler 101 are all connected at a second point. A third on-off valve 33 is connected in series on the pipeline between the second point and the outlet of the water-cooled condenser 202, and a fourth on-off valve 34 is connected in series on the pipeline between the second point and the outlet of the surface cooler 101. The aforementioned first on-off valve 31, second on-off valve 32, third on-off valve 33, and fourth on-off valve 34 are preferably solenoid valves. In this technical solution, by setting the first on-off valve 31, second on-off valve 32, third on-off valve 33, and fourth on-off valve 34 on the corresponding pipelines, the flow direction of the cooling water in the water-cooled circulation subsystem can be controlled, thereby achieving matching between the cooling water and the operating mode of the computer room air conditioning system.

[0084] According to an embodiment of the present invention, a control method for a computer room air conditioning system as described above is also provided, comprising:

[0085] Obtain the operating mode of the computer room air conditioning system;

[0086] Based on the acquired operating mode, control the opening and closing of the first on / off valve 31, the second on / off valve 32, the third on / off valve 33 and the fourth on / off valve 34, as well as the start and stop of the compressor 201 and / or the water pump 102.

[0087] Specifically, when the operating mode is water cooling mode, the first on / off valve 31 and the fourth on / off valve 34 are opened, the second on / off valve 32 and the third on / off valve 33 are closed, and the water pump 102 is started and the compressor 201 is stopped. That is, in this operating mode, the compressor 201 does not run, but the cooling capacity of the natural environment is utilized through the dry cooler 100, thereby reducing the system's operating energy consumption and achieving high energy saving and environmental protection. See [link to relevant documentation]. Figure 7 As shown, the water in the surface cooler 101 exchanges heat with the air in the computer room and then enters the outdoor dry cooler 100 for heat dissipation under the pumping action of the water pump 102. The cooled water then enters the indoor surface cooler 101 to absorb heat, thus forming a water cooling cycle.

[0088] When the operating mode is the hybrid cooling mode, the first on / off valve 31, the fourth on / off valve 34, the second on / off valve 32, and the third on / off valve 33 are opened, and the water pump 102 is started and operated, and the compressor 201 is started and operated at a first frequency. In this mode, water cooling and refrigerant are used for combined cooling of the air in the computer room. The first frequency is relatively low at this time, which can reduce the system's operating energy consumption while meeting the cooling effect requirements of the computer room. For details, see Figure 7 As shown, in the water-cooled circulation subsystem, under the pumping action of the water pump 102, part of the cooling water flowing out of the dry cooler 100 enters the surface cooler 101 to exchange heat with the air in the machine room and circulates back to the dry cooler 100, while the other part enters the water-cooled condenser 202 to cool and exchange heat with the high-temperature refrigerant flowing into the water-cooled condenser 202, thereby improving the cooling effect of the refrigerant circulation subsystem. At the same time, the compressor 201 operates, and the refrigerant forms a circulation between the compressor 201, the water-cooled condenser 202, the throttling element 203, and the evaporator 204.

[0089] When the operating mode is refrigerant cooling mode, the first on / off valve 31 and the fourth on / off valve 34 are shut off, while the second on / off valve 32 and the third on / off valve 33 are open. This stops the water pump and controls the compressor 201 to start operating at a second frequency, which is higher than the first frequency. This second frequency is a higher frequency, meaning the compressor 201 has a larger cooling capacity. This operating mode is suitable for situations where the outdoor ambient temperature is high, and the natural cooling effect is poor. The compressor 201 compresses the refrigerant to achieve efficient cooling within the machine room. For details, see [link to relevant documentation]. Figure 7As shown, the water-cooled circulation subsystem is not running at this time, the compressor 201 is running, and the refrigerant forms a circulation between the compressor 201, the water-cooled condenser 202, the throttling element 203 and the evaporator 204.

[0090] In a preferred embodiment, during the operation of the computer room air conditioning system in water cooling mode or hybrid cooling mode, the control method further includes:

[0091] Obtain the outdoor ambient temperature;

[0092] The first damper 41 and the second damper 42, as well as the drive fan 3, are switched according to the temperature range of the outdoor ambient temperature. This allows for the reasonable switching and utilization of the operating state of the dry cooler 100 based on the outdoor ambient temperature, ensuring cooling effect while maintaining low system energy consumption.

[0093] Specifically, when the outdoor ambient temperature is in a first temperature range, the first damper 41 is controlled to be in a bottom-closed state, the second damper 42 is in a side-ventilation state, and the drive fan 3 is controlled to start operating at a first speed, so that the dry cooler is in a forced heat dissipation state; or, when the outdoor ambient temperature is in a second temperature range, the first damper 41 is controlled to be in a bottom-ventilation state, the second damper 42 is in a side-ventilation state, and the drive fan 3 is controlled to start operating at a second speed, so that the dry cooler is in a mixed heat dissipation state, the second speed being lower than the first speed; or, when the outdoor ambient temperature is in a third temperature range, the first damper 41 is controlled to be in a bottom-ventilation state, the second damper 42 is in a side-closed state, and the drive fan 3 is controlled to stop operating, so that the dry cooler is in a chimney effect heat dissipation state; the lower limit of the first temperature range is higher than the upper limit of the second temperature range, and the lower limit of the second temperature range is higher than the upper limit of the third temperature range. The aforementioned first temperature range is, for example, above 25°C, the aforementioned second temperature range is, for example, from 5°C to 25°C, and the aforementioned third temperature range is, for example, below 5°C.

[0094] In some implementations...

[0095] When the dry cooler is in the forced cooling state, the higher the indoor return air temperature of the computer room air conditioning system is above the target set value, the higher the first rotation speed and the larger the ventilation area of ​​the second damper 42; conversely, the lower the indoor return air temperature is below the target set value, the lower the first rotation speed and the smaller the ventilation area of ​​the second damper 42; or...

[0096] When the dry cooler is in the mixed heat dissipation state, the higher the indoor return air temperature of the computer room air conditioning system is above the target set value, the higher the second rotation speed and the larger the ventilation area of ​​the first damper 41 and the second damper 42; conversely, the lower the indoor return air temperature is below the target set value, the lower the second rotation speed and the smaller the ventilation area of ​​the first damper 41 and the second damper 42; or...

[0097] When the dry cooler is in the chimney effect heat dissipation state, the higher the indoor return air temperature of the computer room air conditioning system is than the target set value, the larger the ventilation area of ​​the first damper 41 is; the lower the indoor return air temperature is than the target set value, the smaller the ventilation area of ​​the first damper 41 is.

[0098] The three operating states of the dry cooler of the present invention are further described below:

[0099] 1) Forced cooling state

[0100] When using the dry cooler, in hot weather (e.g., above 25°C), the drive fan 3 needs to be turned on for forced cooling based on the feedback of the return air temperature in the computer room. At this time, as the fan speed increases, the opening angle of the louvers (i.e., the two side air vents mentioned above) of the front and back air vents (i.e., the two second air doors 42 mentioned above) also increases, thereby reducing the air intake resistance of the front and back air vents. At the same time, the bottom air inlet (i.e., the bottom side air vent mentioned above) is closed to achieve forced cooling.

[0101] 2) Hybrid heat dissipation state (forced heat dissipation + chimney effect heat dissipation)

[0102] When using the dry cooler, when the outdoor temperature is low (e.g., 5~25℃), based on the feedback of the return air temperature in the machine room, as the speed of the drive fan 3 decreases until the drive fan 3 stops rotating, the louvers of the front and back air vents gradually reduce their angles while the bottom air inlet opens, achieving chimney effect heat exchange and forced heat dissipation.

[0103] 3) Chimney effect heat dissipation state (chimney effect heat dissipation)

[0104] When using the dry cooler, if the outdoor temperature is very low (e.g., below 5°C), the fan 3 will be shut off based on the feedback of the return air temperature in the machine room. The louvers of the front and back air vents will be closed, the bottom air inlet will be opened to allow air in, and the top of the dry cooler will be vented to achieve heat exchange through the chimney effect.

[0105] The chimney effect refers to the principle that hot air rises and cold air is drawn in from the bottom, creating enhanced air convection to achieve natural ventilation. The temperature difference between the air inside and outside the dry cooler creates a difference in air density, resulting in a pressure difference that drives the airflow between the inside and outside. The warmer air, being less dense, rises and is discharged from the upper vent (i.e., the top exhaust vent, corresponding to the outlet of the driving fan 3). This creates a negative pressure zone where the less dense air was originally, thus drawing in fresher, cooler, and denser outdoor air from the bottom of the dry cooler, resulting in a continuous flow of air between the inside and outside of the equipment.

[0106] It should be noted that the aforementioned return air temperature in the computer room mainly refers to the indoor side. For example, when a dry cooler is used to cool the data center, if the indoor temperature requirement is around 24℃, this is a reasonable value. When the outdoor temperature is high, and the detected indoor temperature is much higher than 24℃, it means that the heat dissipation is insufficient. The fans (i.e., the aforementioned drive fan 3) need to be gradually turned on to increase the airflow and force heat dissipation until the return air temperature meets the requirements. The corresponding air vents should also be adjusted accordingly. When the outdoor temperature is low, and the detected indoor temperature is slightly lower, the fan speed can be reduced, and the second damper 42 should be adjusted accordingly, gradually engaging the chimney cooling system, i.e., the first damper 41 should be opened. When the outdoor temperature is very low, far below 24℃, it indicates that too much heat has been dissipated, and the fans can be turned off. Directly using the chimney effect for heat dissipation can meet the requirements, so the first damper 41 should also be adjusted accordingly to gradually utilize the chimney effect. The entire process is dynamic.

[0107] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A dry cooler characterized by, include: Mounting frame (1), wherein an accommodating space (11) is formed within the mounting frame (1); Drive the fan (3) and place it on top of the accommodating space (11); The heat exchanger is placed within the accommodating space (11) and is located on the air inlet side of the driving fan (3); The accommodating space (11) has a bottom air vent at the bottom of the mounting bracket (1) and a side air vent on the side facade of the mounting bracket (1). The heat exchanger is arranged correspondingly to the side air vents. A first damper (41) is provided at the bottom air vent, and a second damper (42) is provided at the side air vent. The first damper (41) has a bottom ventilation state and a bottom closed state, and the second damper (42) has a side ventilation state and a side closed state. The first damper (41) and the second damper (42) can be independently controlled to switch states. When the outdoor ambient temperature is in a first temperature range, the first damper (41) is in a bottom closed state, and the second damper (42) is in a side closed state. The damper (42) is in a side ventilation state to make the dry cooler in a forced heat dissipation state; when the outdoor ambient temperature is in the second temperature range, the first damper (41) is in a bottom ventilation state and the second damper (42) is in a side ventilation state to make the dry cooler in a mixed heat dissipation state; when the outdoor ambient temperature is in the third temperature range, the first damper (41) is in a bottom ventilation state and the second damper (42) is in a side closed state to make the dry cooler in a chimney effect heat dissipation state, the lower limit of the first temperature range is higher than the upper limit of the second temperature range, and the lower limit of the second temperature range is higher than the upper limit of the third temperature range.

2. The dry cooler according to claim 1, characterized in that, The first damper (41) includes multiple controllable rotating door panels (43), the rotation angle of which can be controlled to change to achieve a gradual switch from the bottom ventilation state to the bottom closed state; and / or, The second damper (42) includes multiple controllable rotating door panels (43), the rotation angle of which can be controlled to change to achieve a gradual switch from the side ventilation state to the side closed state.

3. The dry cooler according to claim 1 or 2, characterized in that, The heat exchanger includes a first heat exchanger (21) and a second heat exchanger (22), which are arranged at intervals relative to each other. There are two side air vents, each of which is arranged corresponding to the first heat exchanger (21) and the second heat exchanger (22). The drive fan (3) is located between the first heat exchanger (21) and the second heat exchanger (22).

4. The dry cooler according to claim 3, characterized in that, The minimum horizontal distance between the top ends of the first heat exchanger (21) and the second heat exchanger (22) is greater than the minimum horizontal distance between the bottom ends of the first heat exchanger (21) and the second heat exchanger (22), and the bottom ends of the first heat exchanger (21) and the second heat exchanger (22) are within the coverage area of ​​the bottom side air vent.

5. The dry cooler according to claim 4, characterized in that, The bottom air vent has a first symmetrical plane in the vertical direction. The first heat exchanger (21) and the second heat exchanger (22) are symmetrical about the first symmetrical plane. The minimum horizontal distance between the bottom ends of the first heat exchanger (21) and the second heat exchanger (22) is L. The distance between the two side frames of the bottom air vent that are symmetrical about the first symmetrical plane is S. S / 6≤L≤S / 4.

6. A computer room air conditioning system, comprising a dry cooler (100), characterized in that, The dry cooler (100) is the dry cooler according to any one of claims 1 to 5.

7. The machine room air conditioning system of claim 6, wherein, Also includes: The water-cooled circulation subsystem includes a surface cooler (101) capable of forming a water circulation, a dry cooler (100), and a water pump (102). The refrigerant cycle subsystem includes a compressor (201), a water-cooled condenser (202), a throttling element (203), and an evaporator (204) capable of forming a refrigerant cycle. The cooling water flowing out of the dry cooler (100) can be controlled to flow into the water-cooled condenser (202) and / or the surface cooler (101).

8. The computer room air conditioning system according to claim 7, characterized in that, The outlet of the dry cooler (100) is connected to the inlet of the water-cooled condenser (202) and the inlet of the surface cooler (101) at a first point. A first on / off valve (31) is connected in series on the pipeline between the first point and the inlet of the surface cooler (101), and a second on / off valve (32) is connected in series on the pipeline between the first point and the inlet of the water-cooled condenser (202). The outlet of the water pump (102) is connected to the inlet of the dry cooler (100). The inlet of the water pump (102) is connected to the outlet of the water-cooled condenser (202) and the outlet of the surface cooler (101) at a second point. A third on / off valve (33) is connected in series on the pipeline between the second point and the outlet of the water-cooled condenser (202), and a fourth on / off valve (34) is connected in series on the pipeline between the second point and the outlet of the surface cooler (101).

9. The control method of the machine room air conditioning system as claimed in claim 8, wherein include: Obtain the operating mode of the computer room air conditioning system; The on / off state of the first on / off valve (31), the second on / off valve (32), the third on / off valve (33) and the fourth on / off valve (34), as well as the start and stop of the compressor (201) and / or the water pump (102) are controlled according to the obtained operating mode.

10. The control method according to claim 9, characterized in that, When the operating mode is water cooling mode, the first on / off valve (31) and the fourth on / off valve (34) are opened, the second on / off valve (32) and the third on / off valve (33) are closed, and the water pump (102) is started and the compressor (201) is stopped; or, When the operating mode is a mixed cooling mode, the first on / off valve (31), the fourth on / off valve (34), the second on / off valve (32), and the third on / off valve (33) are opened, and the water pump (102) is started and operated, and the compressor (201) is started and operated at a first frequency; or, When the operating mode is refrigerant cooling mode, the first on / off valve (31) and the fourth on / off valve (34) are cut off, and the second on / off valve (32) and the third on / off valve (33) are opened, the water pump is stopped, and the compressor (201) is started to operate at a second frequency, which is higher than the first frequency.

11. The control method according to claim 10, characterized in that, During the operation of the computer room air conditioning system in water cooling mode or hybrid cooling mode, the control method further includes: Obtain the outdoor ambient temperature; The state switching of the first damper (41) and the second damper (42) and the start and stop of the drive fan (3) are controlled according to the temperature range of the outdoor ambient temperature.

12. The control method according to claim 11, characterized in that, When the outdoor ambient temperature is within the first temperature range, the first damper (41) is controlled to be in a bottom closed state, the second damper (42) is controlled to be in a side ventilation state, and the drive fan (3) is controlled to start running at a first speed so that the dry cooler is in a forced heat dissipation state; or, When the outdoor ambient temperature is in the second temperature range, the first damper (41) is controlled to be in bottom ventilation mode and the second damper (42) is controlled to be in side ventilation mode, and the drive fan (3) is controlled to start running at the second speed, so that the dry cooler is in a mixed heat dissipation state, where the second speed is lower than the first speed; or, When the outdoor ambient temperature is in the third temperature range, the first damper (41) is controlled to be in the bottom ventilation state, the second damper (42) is controlled to be in the side closed state, and the drive fan (3) is controlled to stop running so that the dry cooler is in the chimney effect heat dissipation state. The lower limit of the first temperature range is higher than the upper limit of the second temperature range, and the lower limit of the second temperature range is higher than the upper limit of the third temperature range.

13. The control method according to claim 12, characterized in that, When the dry cooler is in the forced cooling state, the higher the indoor return air temperature of the computer room air conditioning system is above the target set value, the higher the first rotation speed and the larger the ventilation area of ​​the second damper (42); the lower the indoor return air temperature is below the target set value, the lower the first rotation speed and the smaller the ventilation area of ​​the second damper (42); or, When the dry cooler is in the mixed heat dissipation state, the higher the indoor return air temperature of the computer room air conditioning system is above the target set value, the higher the second rotation speed and the larger the ventilation area of ​​the first damper (41) and the second damper (42); the lower the indoor return air temperature is below the target set value, the lower the second rotation speed and the smaller the ventilation area of ​​the first damper (41) and the second damper (42); or, When the dry cooler is in the chimney effect heat dissipation state, the more the indoor return air temperature of the computer room air conditioning system is higher than the target set value, the larger the ventilation area of ​​the first damper (41) will be; the more the indoor return air temperature is lower than the target set value, the smaller the ventilation area of ​​the first damper (41) will be.

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