Heat dissipation system and its control method, electrical equipment

Abstract

This invention provides a heat dissipation system and its control method, as well as electrical equipment. The heat dissipation system includes a first refrigerant circulation system and a second refrigerant circulation system. The first refrigerant circulation system includes a first medium channel of a first pump component and a first heat exchanger. The second refrigerant circulation system includes a compressor, a second heat exchanger, and a second medium channel of the first heat exchanger connected in sequence, as well as a second pump component, a throttling component, and a compression branch pipeline. The compression branch pipeline is connected in parallel with the compression pipeline where the compressor is located, and a first valve is installed on the compression branch pipeline. In the second refrigerant circulation system, the refrigerant in the first circulation path flows sequentially through the second pump component, the throttling component, the second medium channel, the compression branch pipeline, and the second heat exchanger; the refrigerant in the second circulation path flows sequentially through the compressor, the second heat exchanger, the throttling component, and the second medium channel. This heat dissipation system can reduce intermediate components and improve heat exchange efficiency while using the same natural cold source.

Description

Technical Field

[0001] This invention relates to the field of heat dissipation technology, and more specifically, to a heat dissipation system and its control method, as well as electrical equipment. Background Technology

[0002] Nowadays, heat dissipation in computer rooms and other environments is becoming increasingly important, which has led to the development of various heat exchange methods. Immersion cooling has an excellent heat dissipation effect. To ensure the heat exchange effect, early multi-stage heat exchange systems combined a front-end heat exchange system, an intermediate heat exchange system, and a terminal heat exchange system. This type of multi-stage heat exchange system has a high number of heat exchange cycles, poor reliability, and high cost.

[0003] Furthermore, traditional multi-stage heat exchange systems often use water as the medium, which can utilize natural cooling sources to reduce room load to some extent. However, water systems are prone to corrosion, and in winter or when temperatures are low, antifreeze (such as ethylene glycol) needs to be added to the water system, which affects its performance. Summary of the Invention

[0004] The first objective of this invention is to provide a heat dissipation system that can reduce intermediate components and improve heat exchange efficiency while still using natural cold sources.

[0005] A second objective of this invention is to provide a control method for the above-mentioned heat dissipation system.

[0006] A third objective of the present invention is to provide an electrical device having the above-described heat dissipation system.

[0007] To achieve the aforementioned first objective, the present invention provides a heat dissipation system, comprising a first refrigerant circulation system and a second refrigerant circulation system; the first refrigerant circulation system includes a first pump component and a first medium channel of a first heat exchanger; the first refrigerant circulation system further includes a third heat exchanger, the third heat exchanger, the first medium channel, and the first pump component are sequentially connected; or the first refrigerant circulation system further includes a liquid storage chamber, the liquid storage chamber, the first medium channel, and the first pump component are sequentially connected. The second refrigerant circulation system includes a compressor, a second heat exchanger, and a second medium channel of the first heat exchanger connected in sequence; the second refrigerant circulation system further includes a second pump component, a throttling component, and a compression branch pipeline; the second pump component is connected between the second heat exchanger and the throttling component; the compression branch pipeline is connected in parallel with the compression pipeline where the compressor is located, and a first valve is provided on the compression branch pipeline; the second refrigerant circulation system has a first circulation path and a second circulation path; in the first circulation path, the refrigerant flows sequentially through the second pump component, the throttling component, the second medium channel, the compression branch pipeline, and the second heat exchanger; in the second circulation path, the refrigerant flows sequentially through the compressor, the second heat exchanger, the throttling component, and the second medium channel.

[0008] As can be seen from the above scheme, when the outdoor cold source temperature is low and the heat exchange temperature difference is large, the second pump component operates, the compressor stops operating, the first valve opens, and the refrigerant flows along the first circulation path, using natural cold source for cooling. When the outdoor temperature is high or the heat exchange temperature difference is small, the compressor operates, the first valve closes, and the refrigerant flows along the second circulation path. By setting up a second pump component, a compression branch pipeline connected in parallel with the compressor, and a first valve on the compression branch pipeline, the system structure can be simplified, reducing intermediate components and improving heat exchange efficiency while still using natural cold source. Furthermore, by setting up a third heat exchanger and placing the heating element close to it, or by directly immersing the heating element in the liquid storage chamber, rapid cooling of the heating element can be achieved.

[0009] A preferred embodiment is that the refrigerant in the first refrigerant cycle system is a fluorinated liquid; and / or the refrigerant in the second refrigerant cycle system is a refrigerant.

[0010] Therefore, it is evident that neither system uses water as a refrigerant, which avoids the corrosion problems associated with water systems and eliminates the risk of leaks caused by corrosion.

[0011] A preferred embodiment is that a throttling pipe is provided between the throttling component and the second heat exchanger, and the second pump component is located on the throttling pipe; the second refrigerant circulation system also includes a pump branch pipe, which is connected in parallel with the throttling pipe.

[0012] Therefore, by setting up a pump branch line in parallel with the throttling line, the second pump component can be selectively opened and closed.

[0013] A further option is to install a second valve on the throttling line; and / or a third valve on the pump branch line.

[0014] Therefore, it can be seen that the installation of the second and third valves can control the opening and closing of the corresponding pipelines.

[0015] A further solution is to install a fourth valve on the pump branch line.

[0016] A further option is that the third valve is a one-way valve, which allows one-way flow from the end of the pump branch pipe connected to the second heat exchanger to the end of the pump branch pipe connected to the throttling component; the fourth valve is a solenoid valve.

[0017] Therefore, it can be seen that the one-way valve can realize the one-way flow of refrigerant in the pump branch pipeline, and prevent the pump branch pipeline and the throttling pipeline from forming a self-circulating loop when both the second and fourth valves are closed.

[0018] A preferred embodiment is that a one-way valve is also installed on the compression branch pipeline, which allows one-way flow from the end of the compression branch pipeline connected to the second medium channel to the end of the compression branch pipeline connected to the second heat exchanger.

[0019] Therefore, the one-way valve on the compression branch line can achieve unidirectional flow of refrigerant on the line, preventing the compression branch line from forming a self-circulating loop with the compressor line.

[0020] To achieve the second objective mentioned above, the present invention provides a control method for the aforementioned heat dissipation system. The control method includes: after entering a cooling mode, acquiring the outdoor ambient temperature and the inlet side temperature value of the first medium channel; if the outdoor ambient temperature is greater than a first preset temperature value, then turning on the compressor and closing the first valve; if the outdoor ambient temperature is less than or equal to the first preset temperature value, then determining whether the difference between the outdoor ambient temperature and the inlet side temperature value is less than a preset temperature difference; if yes, then turning on the compressor and closing the first valve; if no, then turning on the second pump component, turning off the compressor, and opening the first valve.

[0021] As can be seen from the above scheme, when the outdoor cold source temperature is low and the heat exchange temperature difference is large, the second pump component operates, the compressor stops operating, the first valve opens, and the refrigerant flows along the first circulation path; when the outdoor temperature is high or the heat exchange temperature difference is small, the compressor operates, the first valve closes, and the refrigerant flows along the second circulation path. By setting up a second pump component, a compression branch pipeline connected in parallel with the compressor, and installing a first valve on the compression branch pipeline, two circulation paths are formed in the refrigeration system. This simplifies the system structure, reduces intermediate components, and improves heat exchange efficiency while still being able to use a natural cold source.

[0022] A preferred embodiment is that if the outdoor ambient temperature is greater than a first preset temperature value, the compressor is turned on and the step of closing the first valve further includes turning on the second pump component.

[0023] Therefore, starting the second pump component at the same time as starting the compressor can increase the flow velocity of the refrigerant in the circulation path, thereby improving the heat exchange efficiency.

[0024] A preferred approach is to determine whether the difference between the outdoor ambient temperature and the inlet temperature is less than a preset temperature difference; if so, the compressor is turned on and the first valve is closed. The steps also include turning on the second pump component.

[0025] Therefore, when the heat exchange temperature difference is small, simultaneously turning on the compressor and the second pump can increase the flow velocity of the refrigerant in the circulation path, thereby improving the heat exchange efficiency.

[0026] To achieve the third objective mentioned above, the present invention provides an electrical device including a heating element and the aforementioned heat dissipation system, wherein the heating element is disposed near a third heat exchanger or located within a liquid storage chamber.

[0027] Therefore, by setting up a third heat exchanger and placing the heating element close to the third heat exchanger, or by directly immersing the heating element in the liquid storage chamber, rapid cooling of the heating element can be achieved. Attached Figure Description

[0028] Figure 1 This is a system block diagram of the first embodiment of the heat dissipation system of the present invention.

[0029] Figure 2 This is a flowchart of the first embodiment of the heat dissipation system of the present invention.

[0030] Figure 3 This is a system block diagram of the second embodiment of the heat dissipation system of the present invention.

[0031] Figure 4 This is a system block diagram of the third embodiment of the heat dissipation system of the present invention.

[0032] Figure 5 This is a system block diagram of the fourth embodiment of the heat dissipation system of the present invention.

[0033] Figure 6 This is a flowchart of the fourth embodiment of the heat dissipation system of the present invention.

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0035] Various exemplary embodiments of the invention will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are in no way intended to limit the invention or its application or use. The invention can be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the invention thorough and complete, and to fully express the scope of the invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0036] The terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after it, without excluding the possibility of encompassing other elements. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0037] In this invention, when a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediary device, or it may be not directly connected to the other devices but have an intermediary device.

[0038] All terms used in this invention (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having the meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0039] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0040] First embodiment of heat dissipation system and its control method, and electrical equipment:

[0041] See Figure 1 The electrical equipment in this embodiment includes a heating element and a heat dissipation system 1. The heating element is disposed close to the third heat exchanger 12 of the heat dissipation system 1, thereby achieving cooling of the heating element.

[0042] The heat dissipation system 1 includes a first refrigerant circulation system 10 and a second refrigerant circulation system 20. The first refrigerant circulation system 10 includes a first pump component 11, a third heat exchanger 12, and a first medium channel of the first heat exchanger 3. The third heat exchanger 12, the first medium channel, and the first pump component 11 are connected in sequence.

[0043] The second refrigerant circulation system 20 includes a compressor 21, a second heat exchanger 22, a second pump assembly 23, a throttling component 24, and a second medium passage of a first heat exchanger 3 connected in sequence. The second refrigerant circulation system 20 also includes a compression branch pipeline 25. The first heat exchanger 3 can be a plate heat exchanger or a shell-and-tube heat exchanger, etc. Preferably, the throttling component 24 is an electronic expansion valve.

[0044] The second pump component 23 is connected between the second heat exchanger 22 and the throttling component 24. The compression branch pipeline 25 is connected in parallel with the compression pipeline 26 where the compressor 21 is located. A first valve 27 is provided on the compression branch pipeline 25. The first valve 27 is a solenoid valve.

[0045] The second refrigerant circulation system 20 has a first circulation path and a second circulation path. In the first circulation path, the refrigerant flows sequentially through the second pump component 23, the throttling component 24, the second medium channel, the compression branch pipeline 25, and the second heat exchanger 22. In the second circulation path, the refrigerant flows sequentially through the compressor 21, the second heat exchanger 22, the second pump component 23, the throttling component 24, and the second medium channel.

[0046] The refrigerant in the first refrigerant circulation system 10 is fluorinated liquid, and the refrigerant in the second refrigerant circulation system 20 is refrigerant.

[0047] See Figure 2 The control method of the heat dissipation system 1 in this embodiment includes the following steps:

[0048] First, step S1 is executed. When the indoor ambient temperature exceeds the preset start-up temperature value, the cooling mode is entered. After entering the cooling mode, the outdoor ambient temperature, the inlet temperature of the first medium channel, and the temperature of the fluorinated liquid at the outlet of the third heat exchanger 12 are obtained through various temperature sensors. Preferably, the preset start-up temperature value is 24°C.

[0049] Next, step S2 is executed to determine whether the outdoor ambient temperature is greater than the first preset temperature value. If the outdoor ambient temperature is greater than the first preset temperature value, then step S3 is executed to turn on the compressor 21 and the second pump component 23, and close the first valve 27. At this time, the second circulation path is opened. Preferably, the first preset temperature value is 30±2℃.

[0050] If the outdoor ambient temperature is less than or equal to the first preset temperature value, then proceed to step S4.

[0051] Step S4 is to determine whether the difference between the outdoor ambient temperature and the inlet side temperature of the first medium channel is less than the preset temperature difference.

[0052] If so, it means that although the ambient temperature is low, the heat exchange temperature difference is small. In this case, proceed to step S3, turn on the compressor 21 and the second pump component 23, and close the first valve 27. At this time, the second circulation path is open. Simultaneously turning on the second pump component 23 and the compressor 21 together will result in a better cooling effect.

[0053] If not, it indicates that the ambient temperature is low and the heat exchange temperature difference is large. In this case, proceed to step S5: turn on the second pump component 23, turn off the compressor 21, and open the first valve 27. At this time, the first circulation path is open. Cooling can be performed by turning on only the second pump component 23.

[0054] Next, step S6 is executed. If the temperature of the fluorinated liquid at the outlet side of the third heat exchanger 12 is lower than the second preset temperature value, then step S7 is executed to exit the refrigeration mode. Preferably, the second preset temperature value is 17°C to 19°C.

[0055] As can be seen from the above, when the outdoor cold source temperature is low and the heat exchange temperature difference is large, only the second pump component works, the compressor stops working, the first valve opens, and the refrigerant flows along the first circulation path, using natural cold source for cooling. When the outdoor temperature is high or the heat exchange temperature difference is small, the compressor and the second pump component work simultaneously, the first valve closes, and the refrigerant flows along the second circulation path. By setting up the second pump component, a compression branch pipeline connected in parallel with the compressor, and setting the first valve on the compression branch pipeline, two circulation paths are formed in the refrigeration system. This simplifies the system structure, reduces intermediate components, and improves heat exchange efficiency while still using natural cold source. Furthermore, in the heat dissipation system of this invention, the refrigerant in both refrigerant circulation systems does not use water, which avoids the corrosive problems caused by water systems and eliminates the risk of leakage caused by corrosion.

[0056] Second embodiment of heat dissipation system and its control method, and electrical equipment:

[0057] As a description of the second embodiment of the heat dissipation system, control method and electrical equipment of the present invention, the following description only focuses on the differences from the first embodiment of the heat dissipation system, control method and electrical equipment described above.

[0058] See Figure 3 In this embodiment, the third heat exchanger in the first refrigerant circulation system 210 is replaced by a liquid storage chamber 212. The liquid storage chamber 212, the first medium channel 231 and the first pump component 211 are connected in sequence, and the heating element is immersed in the liquid storage chamber 212.

[0059] Third embodiment of heat dissipation system and its control method, and electrical equipment:

[0060] As a description of the third embodiment of the heat dissipation system, control method and electrical equipment of the present invention, the following description only focuses on the differences from the first embodiment of the heat dissipation system, control method and electrical equipment described above.

[0061] See Figure 4In this embodiment, a one-way valve 31 is also provided on the compression branch pipeline 35. The one-way valve 31 is open unidirectionally from the end of the compression branch pipeline 35 connected to the second medium channel 33 to the end of the compression branch pipeline 35 connected to the second heat exchanger 32. A solenoid valve 37 is provided on the compression pipeline 36.

[0062] In the control method of this embodiment, the solenoid valve 37 is opened in step S3 and closed in step S5.

[0063] Therefore, the one-way valve on the compression branch line can achieve unidirectional flow of refrigerant on the line, preventing the compression branch line from forming a self-circulating loop with the compressor line.

[0064] Fourth embodiment of heat dissipation system and its control method, electrical equipment:

[0065] As a description of the fourth embodiment of the heat dissipation system, control method and electrical equipment of the present invention, the following description only focuses on the differences from the third embodiment of the heat dissipation system, control method and electrical equipment described above.

[0066] See Figure 5 In this embodiment, a throttling pipe 41 is provided between the throttling component 44 and the second heat exchanger 42, and the second pump component 43 is located on the throttling pipe 41.

[0067] The second refrigerant circulation system 420 also includes a pump branch line 45, which is connected in parallel with the throttling line 41. A second valve 46 is installed on the throttling line 41, and a third valve 47 and a fourth valve 48 are installed on the pump branch line 45. Preferably, the second valve 46 and the fourth valve 48 are solenoid valves, and the third valve 47 is a one-way valve, allowing one-way flow from the end of the pump branch line 45 connected to the second heat exchanger 42 to the end of the pump branch line 45 connected to the throttling component 44.

[0068] Therefore, by setting up a pump branch line 45 in parallel with the throttling line 41, the second pump component 43 can be selectively opened and closed. In addition, the one-way valve 47 enables unidirectional flow of refrigerant on the pump branch line 45, preventing the pump branch line 45 from forming a self-circulating loop with the throttling line 41 when both the second valve 46 and the fourth valve 48 are closed.

[0069] See Figure 6 The control method in this embodiment includes the following steps:

[0070] First, step S41 is executed. When the indoor ambient temperature exceeds the preset start-up temperature value, the cooling mode is entered. After entering the cooling mode, the outdoor ambient temperature, the inlet side temperature value of the first medium channel, and the temperature of the fluorinated liquid at the outlet side of the third heat exchanger 412 are obtained through various temperature sensors.

[0071] Next, step S42 is executed to determine whether the outdoor ambient temperature is greater than the first preset temperature value. If the outdoor ambient temperature is greater than the first preset temperature value, then step S43 is executed to turn on the compressor 421 and the second pump component 43, close the first valve 427, and open the second valve 46.

[0072] If the outdoor ambient temperature is less than or equal to the first preset temperature value, then proceed to step S44.

[0073] Step S44 is: Determine whether the difference between the outdoor ambient temperature and the inlet side temperature of the first medium channel is less than the preset temperature difference.

[0074] If so, proceed to step S43: turn on compressor 421 and second pump component 43, close first valve 427, and open second valve 46. Simultaneously, start second pump component 43 and compressor 421 for joint cooling.

[0075] If not, proceed to step S45: turn on the second pump assembly 43, turn off the compressor 421, and open the first valve 427 and the second valve 46. Only the second pump assembly 43 is turned on for cooling.

[0076] Next, step S46 is executed. When the temperature of the fluorinated liquid at the outlet side of the third heat exchanger 412 is lower than the second preset temperature value, step S47 is executed to exit the refrigeration mode.

[0077] In other embodiments, in step S43 of the above control method, the fourth valve 48 can be opened or closed. At the same time, when the fourth valve 48 is open, the second pump component 43 and the second valve 46 may not be turned on.

[0078] In addition, cooling fans can be installed near the second and third heat exchangers to accelerate heat exchange efficiency. In the third embodiment of the heat dissipation system, the solenoid valve can be omitted from the compression pipeline, and the fourth valve can be omitted from the pump branch pipeline. Alternatively, the cooling mode can be exited when the temperature of the fluorinated liquid at the outlet side of the third heat exchanger is close to the indoor ambient temperature, thus reducing the impact of user-side temperature errors on the heat dissipation system. These modifications also achieve the objectives of the present invention.

[0079] Finally, it should be emphasized that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A control method for a heat dissipation system, wherein the heat dissipation system includes a first refrigerant circulation system and a second refrigerant circulation system; The first refrigerant circulation system includes a first pump component and a first medium passage of a first heat exchanger; The first refrigerant circulation system further includes a third heat exchanger, wherein the third heat exchanger, the first medium channel, and the first pump component are connected in sequence; or the first refrigerant circulation system further includes a liquid storage chamber, wherein the liquid storage chamber, the first medium channel, and the first pump component are connected in sequence. The second refrigerant circulation system includes a compressor, a second heat exchanger, and a second medium passage connected in sequence with the first heat exchanger; Its features are: The second refrigerant circulation system also includes a second pump assembly, a throttling assembly, and a compression branch pipeline; The second pump component is connected between the second heat exchanger and the throttling component; The compression branch pipeline is connected in parallel with the compression pipeline where the compressor is located, and a first valve is provided on the compression branch pipeline; The second refrigerant circulation system has a first circulation path and a second circulation path; In the first circulation path, the refrigerant flows sequentially through the second pump component, the throttling component, the second medium channel, the compression branch pipeline, and the second heat exchanger; In the second circulation path, the refrigerant flows sequentially through the compressor, the second heat exchanger, the throttling component, and the second medium channel; The control method includes: After entering the cooling mode, the outdoor ambient temperature and the inlet side temperature value of the first medium channel are obtained; If the outdoor ambient temperature is greater than the first preset temperature value, then the compressor is turned on and the first valve is closed; If the outdoor ambient temperature is less than or equal to the first preset temperature value, then determine whether the difference between the outdoor ambient temperature and the inlet side temperature value is less than the preset temperature difference; If so, then turn on the compressor and close the first valve; If not, then turn on the second pump component, turn off the compressor, and open the first valve.

2. The control method according to claim 1, characterized in that: The refrigerant in the first refrigerant cycle system is a fluorinated liquid; and / or The refrigerant in the second refrigerant cycle system is a refrigerant.

3. The control method according to claim 1, characterized in that: A throttling pipe is provided between the throttling component and the second heat exchanger, and the second pump component is located on the throttling pipe; The second refrigerant circulation system also includes a pump branch line, which is connected in parallel with the throttling line.

4. The control method according to claim 3, characterized in that: A second valve is provided on the throttling pipeline; and / or A third valve is installed on the pump branch pipeline.

5. The control method according to claim 4, characterized in that: A fourth valve is also installed on the pump branch pipeline.

6. The control method according to claim 5, characterized in that: The third valve is a one-way valve, which allows one-way flow from the end of the pump branch pipe connected to the second heat exchanger to the end of the pump branch pipe connected to the throttling component. The fourth valve is a solenoid valve.

7. The control method according to any one of claims 1 to 6, characterized in that: The compression branch pipeline is also equipped with a one-way valve, which allows one-way flow from the end of the compression branch pipeline connected to the second medium channel to the end of the compression branch pipeline connected to the second heat exchanger.

8. The control method according to claim 1, characterized in that: If the outdoor ambient temperature is greater than the first preset temperature value, the step of turning on the compressor and closing the first valve further includes: Turn on the second pump component.

9. The control method according to claim 1 or 8, characterized in that: The step of determining whether the difference between the outdoor ambient temperature and the inlet side temperature is less than a preset temperature difference, and if so, then turning on the compressor and closing the first valve, further includes: Turn on the second pump component.

10. Electrical equipment, characterized in that, It includes a heat-generating element and a heat dissipation system, wherein the heat dissipation system performs the control method of the heat dissipation system according to any one of claims 1 to 9; The heating element is positioned close to the third heat exchanger of the heat dissipation system, or The heating element is located inside the liquid storage chamber of the heat dissipation system.

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