CN114528180A - Method and device for monitoring liquid cooling system of dual-phase cold plate - Google Patents

Abstract

The present invention provides a monitoring method and a monitoring device for a dual-phase cold plate liquid cooling system; wherein, the method includes: acquiring the temperature of the refrigerant at the outlet of a circulating pump of the dual-phase cold plate liquid cooling system and setting the temperature in the dual-phase cold plate liquid cooling system The power consumption of the CPU with the internal temperature sensor near the evaporator; the first CPU junction temperature of the CPU is obtained according to the refrigerant temperature at the outlet of the circulating pump and the power consumption of the CPU; the second CPU junction temperature of the CPU is obtained through the internal temperature sensor ; Determine the refrigerant leakage of the dual-phase cold plate liquid cooling system according to the difference change between the first CPU junction temperature and the second CPU junction temperature. The invention utilizes the strong coupling relationship between the cooling object and the cooling system, and designs a two-phase cold plate liquid cooling system by taking the cooling object-CPU with an internal temperature sensor as a device reflecting the state of the cooling system The monitoring method can achieve accurate monitoring of refrigerant leakage at a lower cost.

Description

A monitoring method and monitoring device for a two-phase cold plate liquid cooling system

technical field

The invention relates to the field of refrigerant leakage monitoring, in particular to a monitoring method and device for a dual-phase cold plate liquid cooling system.

Background technique

At present, there are few application cases of dual-phase cold plate liquid cooling technology in data centers, and the scale is also small. When there is refrigerant leakage in the two-phase cold plate liquid cooling system, a simple hand-held leak detector is often used to locate and detect (detecting the halogen concentration in the space) node by node, which takes a long time, the efficiency is too low, and the investment cost is high; In addition, if the positioning time is too long, it is easy to cause the leakage of refrigerant in the system to be too large to be replenished, which will lead to the phenomenon of dry burning of the system evaporator, which will seriously affect the reliability of the cooling object. In addition, using a handheld leak detector to locate the leaking node is also difficult to judge the size of the leak. The operator can only judge by experience whether the pipeline of the leaking node needs to be cut off immediately, which requires higher requirements for the operator and is likely to cause misjudgment.

Therefore, there is an urgent need for a more accurate and reliable monitoring method or device for monitoring the leakage of refrigerant in a two-phase cold plate liquid cooling system.

SUMMARY OF THE INVENTION

In order to more accurately and reliably monitor the refrigerant leakage of the two-phase cold plate liquid cooling system. In one aspect of the present invention, a monitoring method for a dual-phase cold plate liquid cooling system is proposed, the method comprising: acquiring the temperature of the refrigerant at the outlet of a circulating pump of the dual-phase cold plate liquid cooling system and setting the temperature at the outlet of the two-phase cold plate liquid cooling system. The power consumption of the CPU with the internal temperature sensor near the evaporator of the two-phase cold plate liquid cooling system; the first CPU junction temperature of the CPU is obtained according to the refrigerant temperature at the outlet of the circulating pump and the power consumption of the CPU ; Obtain the second CPU junction temperature of the CPU through the internal temperature sensor; determine the dual-phase cold plate liquid cooling system according to the difference between the first CPU junction temperature and the second CPU junction temperature of refrigerant leakage.

In one or more embodiments, the judging the refrigerant leakage of the dual-phase cold plate liquid cooling system according to the difference change between the first CPU junction temperature and the second CPU junction temperature includes: When the difference between the first CPU junction temperature and the second CPU junction temperature is greater than a first preset value and remains for a preset time, it is determined that a slight refrigerant leakage occurs in the dual-phase cold plate liquid cooling system.

In one or more embodiments, the judging the refrigerant leakage of the dual-phase cold plate liquid cooling system according to the difference change between the first CPU junction temperature and the second CPU junction temperature includes: When the first CPU junction temperature is higher than the second CPU junction temperature first, then the second CPU junction temperature increases rapidly and the difference between the second CPU junction temperature and the first CPU junction temperature is greater than the first CPU junction temperature. When two preset values are used, it is judged that serious refrigerant leakage occurs in the two-phase cold plate liquid cooling system.

In one or more embodiments, the method further includes: when it is determined that serious refrigerant leakage occurs in the dual-phase cold plate liquid cooling system, controlling the dual-phase cold plate liquid cooling system to cut off the pipeline where the serious refrigerant leakage occurs .

In one or more embodiments, the method further includes: acquiring a plurality of refrigerant pipe wall temperatures near a plurality of connectors of the dual-phase cold plate liquid cooling system; and determining a refrigerant based on the plurality of refrigerant pipe wall temperatures leak location.

In a second aspect of the present invention, a monitoring system for a two-phase cold plate liquid cooling system is proposed, comprising: a plurality of temperature sensors, at least one of the plurality of sensors is disposed in the two-phase cold plate liquid cooling system A refrigerant temperature sensor configured to detect the temperature of the refrigerant at the outlet of the circulating pump; and a processing module, the processing module is at least configured to obtain the temperature of the refrigerant at the outlet of the circulating pump of the two-phase cold plate liquid cooling system and set at The power consumption of the CPU with the internal temperature sensor near the evaporator of the two-phase cold plate liquid cooling system; the first CPU of the CPU is obtained according to the refrigerant temperature at the outlet of the circulating pump and the power consumption of the CPU junction temperature; obtain the second CPU junction temperature of the CPU through the internal temperature sensor; and judge the dual-phase cold plate according to the difference change between the first CPU junction temperature and the second CPU junction temperature Leakage of refrigerant in liquid cooling system.

In one or more embodiments, the processing module is further configured to: when the difference between the first CPU junction temperature and the second CPU junction temperature is greater than a first preset value and maintained for a preset time , it is judged that a slight refrigerant leakage occurs in the two-phase cold plate liquid cooling system.

In one or more embodiments, the processing module is further configured to: when the first CPU junction temperature is greater than the second CPU junction temperature first, and then the second CPU junction temperature increases rapidly and the When the difference between the temperature of the second CPU junction and the temperature of the first CPU junction is greater than a second preset value, it is determined that a serious refrigerant leakage occurs in the two-phase cold plate liquid cooling system.

In one or more embodiments, the processing module is further configured to: when it is determined that serious refrigerant leakage occurs in the dual-phase cold plate liquid cooling system, control the dual-phase cold plate liquid cooling system to cut off the severe refrigerant leakage. the pipeline.

In one or more embodiments, the plurality of sensors further include a plurality of sensors disposed on the wall of the refrigerant pipe near the connector of the dual-phase cold plate liquid cooling system, and the processing module is further configured to: Obtaining multiple refrigerant pipe wall temperatures near multiple connectors of the dual-phase cold plate liquid cooling system; and determining refrigerant leakage locations based on the multiple refrigerant pipe wall temperatures. The beneficial effects of the present invention include: the present invention utilizes the strong coupling relationship between the cooling object and the cooling system, and designs a cooling object, a CPU with an internal temperature sensor, as a device that reflects the state of the cooling system. The monitoring method of the two-phase cold plate liquid cooling system; the method of the present invention can not only accurately judge the refrigerant leakage (slight or serious) of the two-phase cold plate liquid cooling system, but also only needs to use relatively cheap The temperature sensor makes the hardware investment cost lower and easier to popularize and implement.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other embodiments can also be obtained according to these drawings without creative efforts.

Fig. 1 is the working flow chart of the monitoring method of a kind of dual-phase cold plate liquid cooling system of the present invention;

FIG. 2 is a reference diagram for use of the monitoring system of the dual-phase cold plate liquid cooling system of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention will be further described in detail below with reference to the specific embodiments and the accompanying drawings.

It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two entities with the same name but not the same or non-identical parameters. It can be seen that "first" and "second" It is only for the convenience of expression and should not be construed as a limitation to the embodiments of the present invention, and subsequent embodiments will not describe them one by one.

FIG. 1 is a working flow chart of a monitoring method for a dual-phase cold plate liquid cooling system according to the present invention. As shown in FIG. 1 , the work flow of the monitoring method of the dual-phase cold plate liquid cooling system of the present invention includes: step S1, obtaining the temperature of the refrigerant at the outlet of the circulating pump of the dual-phase cold plate liquid cooling system, and setting it on the dual-phase cold plate liquid cooling system. The power consumption of the CPU with the internal temperature sensor near the evaporator of the liquid cooling system; Step S2, obtain the first CPU junction temperature of the CPU according to the refrigerant temperature at the outlet of the circulating pump and the power consumption of the CPU; Step S3, pass the internal temperature The sensor obtains the temperature of the second CPU junction of the CPU; step S4, according to the change of the difference between the temperature of the first CPU junction and the temperature of the second CPU junction, determine the refrigerant leakage of the dual-phase cold plate liquid cooling system.

The principle of the present invention includes: on the one hand, the refrigerant in the two-phase cold plate liquid cooling system is in a two-phase flow state at all times. When the two-phase cold plate liquid cooling system works normally, the two-phase flow state is in a saturated state, and at this time, the refrigerant pipe is in a two-phase flow state. The temperature of the refrigerant at the same position and the evaporation temperature of the refrigerant have a stable corresponding relationship corresponding to the saturated two-phase flow state. When the refrigerant leakage occurs in the two-phase cold plate liquid cooling system, the saturation state of the two-phase flow state will be broken, and the stable relationship between the refrigerant temperature and the evaporation temperature of the refrigerant will be destroyed.

On the other hand, the real junction temperature of the CPU can be directly obtained by the internal temperature sensor of the CPU, where the internal temperature sensor is a temperature sensor built in the CPU; in addition, the junction temperature of the CPU can also be calculated by the following formula:

CPU junction temperature 1 = refrigerant evaporation temperature + thermal resistance from CPU to cold plate * CPU power consumption

If the evaporation temperature of the refrigerant in the above formula is replaced by the refrigerant temperature, it can be obtained:

CPU junction temperature 2 = refrigerant temperature + thermal resistance from CPU to cold plate * CPU power consumption;

It can be seen from the above that when the two-phase cold plate liquid cooling system is working normally, there is a stable correspondence between the refrigerant temperature and the evaporation temperature of the refrigerant. Therefore, the difference between the CPU junction temperature 1 and the CPU junction temperature 2 is also stable.

When the two-phase cold plate liquid cooling system leaks the refrigerant, the stable relationship between the refrigerant temperature and the evaporation temperature of the refrigerant is broken, resulting in the difference between the CPU junction temperature 1 and the CPU junction temperature 2 being correspondingly unstable. It can be judged whether there is refrigerant leakage in the two-phase cold plate liquid cooling system according to the difference between the two.

In the above embodiments of the present invention, in order to make the difference between the first CPU junction temperature and the second CPU junction temperature change more obviously, the present invention also specifically selects the refrigerant temperature at the outlet of the circulating pump. The reason is that the evaporation temperature of the refrigerant and the temperature of the refrigerant will also be affected by the internal pressure of the refrigerant pipe, and the pressure at the outlet of the circulating pump is more stable than the pressure at the evaporator. Under the dual influence of being broken and the internal pressure, the difference between the temperature of the first CPU junction and the temperature of the second CPU junction will change more significantly.

It should be noted that the above embodiment is a preferred embodiment of the present invention. In other embodiments, it is also possible to set the refrigerant temperature sensor at other locations to obtain the refrigerant temperature and use it to calculate the first CPU junction temperature. The solution should also fall within the protection scope of the present invention.

In one embodiment, judging the refrigerant leakage of the two-phase cold plate liquid cooling system according to the difference change between the junction temperature of the first CPU and the junction temperature of the second CPU includes: when the junction temperature of the first CPU and the junction temperature of the second CPU are When the temperature difference is greater than the first temperature threshold and remains for a preset time, it is determined that a slight refrigerant leakage occurs in the dual-phase cold plate liquid cooling system.

In this embodiment, when a slight refrigerant leakage occurs, the internal pressure of the evaporator will decrease. On the one hand, the evaporating temperature of the refrigerant inside the evaporator will decrease accordingly, so that the refrigerant will vaporize and absorb heat in advance, so that The junction temperature of the cooling object, the CPU with the internal temperature sensor, is reduced (that is, the junction temperature of the second CPU will be reduced); on the other hand, since the pressure at the outlet of the circulation pump is hardly affected, the pressure at the outlet of the circulation pump The refrigerant temperature will be relatively stable (that is, the temperature of the first CPU junction is almost unchanged), and in order to exclude normal fluctuations, when the difference between the temperature of the first CPU junction minus the temperature of the second CPU junction is greater than the first preset value, it means that Refrigerant leakage occurred in the two-phase cold plate liquid cooling system, and when this state can be maintained for a preset time, it means that the degree of refrigerant leakage is relatively light.

In a further embodiment, when a slight refrigerant leakage occurs, an alarm can also be sent to the corresponding monitoring center to remind relevant maintenance personnel to eliminate the leakage.

In another implementation, when the first CPU junction temperature is higher than the second CPU junction temperature first, then the second CPU junction temperature increases rapidly and the difference between the second CPU junction temperature and the first CPU junction temperature is greater than the second preset value When the two-phase cold plate liquid cooling system is judged to have serious refrigerant leakage.

In this embodiment, in the process in which the first CPU junction temperature is higher than the second CPU junction temperature, the principle is the same as that in the previous implementation. The difference is that when the refrigerant leakage is serious, the evaporator will be The refrigerant inside is insufficient, resulting in insufficient heat dissipation, which in turn causes the temperature of the second CPU junction to decrease first and then rapidly increase until it is greater than the temperature of the first CPU junction.

In a further embodiment, when a serious refrigerant leakage occurs, the dual-phase cold plate liquid cooling system can also be controlled to cut off the pipeline where the serious refrigerant leakage occurs to avoid a large loss of refrigerant and avoid more serious accidents caused by overheating of the cooling object ; At the same time, an alarm is sent to the corresponding monitoring center to remind relevant maintenance personnel to eliminate leakage.

In the above implementations, the present invention utilizes the strong coupling relationship between the cooling object and the cooling system, and uses the cooling object—CPU with an internal temperature sensor as a device reflecting the state of the cooling system to design a dual Monitoring method of phase cold plate liquid cooling system; the method of the present invention can not only more accurately judge the refrigerant leakage (slight or serious) of the two-phase cold plate liquid cooling system, but also only needs to use relatively cheap temperature due to the implementation of the method. Sensors, thus making the hardware investment cost lower and easier to popularize and implement.

In another embodiment, in order to assist in quickly locating the location of refrigerant leakage so as to facilitate leakage elimination, the monitoring method for the dual-phase cold plate liquid cooling system of the present invention further includes: acquiring the vicinity of multiple connectors of the dual-phase cold plate liquid cooling system multiple refrigerant pipe wall temperatures; determine the refrigerant leakage location based on the multiple refrigerant pipe wall temperatures.

In this embodiment, most of the refrigerant leaks occur at the connectors of the dual-phase cold plate liquid cooling system. Therefore, at each connector, once refrigerant leakage occurs, the leaked refrigerant will quickly vaporize and absorb heat, so that the The temperature of the refrigerant pipe wall near the refrigerant leakage location decreases rapidly, and the refrigerant leakage location can be quickly determined by comparing the temperatures at multiple connectors.

In a second aspect of the present invention, a monitoring system for a two-phase cold plate liquid cooling system is proposed. FIG. 2 is a reference diagram for use of the monitoring system of the dual-phase cold plate liquid cooling system of the present invention. As shown in FIG. 2 , the two-phase cold plate liquid cooling system consists of a condenser, a circulating pump, a plurality of evaporators, a plurality of connectors, and a refrigerant pipeline (not shown in detail). The monitoring system of the present invention includes: a plurality of temperature sensors 1, wherein at least one of the plurality of sensors 1 includes a refrigerant temperature sensor 3 arranged at the outlet of the circulating pump of the two-phase cold plate liquid cooling system and configured to detect the temperature of the refrigerant; and a processing Module 2, the processing module 2 is at least configured to obtain the temperature of the refrigerant at the outlet of the circulating pump of the two-phase cold plate liquid cooling system and the power of the CPU with an internal temperature sensor disposed near the evaporator of the two-phase cold plate liquid cooling system. Obtain the first CPU junction temperature of the CPU according to the refrigerant temperature at the outlet of the circulating pump and the power consumption of the CPU; obtain the second CPU junction temperature of the CPU through the internal temperature sensor; and according to the first CPU junction temperature and the second CPU junction temperature The difference between them can be used to judge the refrigerant leakage of the two-phase cold plate liquid cooling system.

In one embodiment, the processing module 2 is further configured to: when the difference between the junction temperature of the first CPU and the junction temperature of the second CPU is greater than a first preset value and maintained for a preset time, determine that the two-phase cold plate is liquid-cooled There is a slight refrigerant leak in the system.

In one embodiment, the processing module 2 is further configured to: when the first CPU junction temperature is higher than the second CPU junction temperature first, and then the second CPU junction temperature increases rapidly and the second CPU junction temperature is the same as the first CPU junction temperature When the difference is greater than the second preset value, it is determined that a serious refrigerant leakage has occurred in the two-phase cold plate liquid cooling system.

In one embodiment, the processing module 2 is further configured to: when it is judged that the dual-phase cold plate liquid cooling system has serious refrigerant leakage, control the dual-phase cold plate liquid cooling system to cut off the pipeline where the serious refrigerant leakage occurs.

In one embodiment, the plurality of sensors 1 further include a plurality of sensors disposed on the wall of the refrigerant pipe near the connector of the dual-phase cold plate liquid cooling system, and the processing module 2 is further configured to: acquire the dual-phase cold plate liquid cooling Multiple refrigerant pipe wall temperatures near multiple connectors of the system; determine the refrigerant leakage location based on the multiple refrigerant pipe wall temperatures.

In the above implementations, the present invention utilizes the strong coupling relationship between the cooling object and the cooling system, and uses the cooling object—CPU with an internal temperature sensor as a device reflecting the state of the cooling system to design a dual Monitoring device for phase cold plate liquid cooling system; the device of the present invention can not only accurately judge the refrigerant leakage (slight or serious) of the two-phase cold plate liquid cooling system, but also because the device only needs to use a relatively cheap temperature sensor, As a result, the cost of hardware investment is also lower, and it is more convenient to popularize and implement.

The above are exemplary embodiments of the present disclosure, but it should be noted that various changes and modifications may be made without departing from the scope of the disclosure of the embodiments of the present invention as defined in the claims. The functions, steps and/or actions of the method claims in accordance with the disclosed embodiments described herein need not be performed in any particular order. Furthermore, although elements disclosed in the embodiments of the present invention may be described or claimed in the singular, unless explicitly limited to the singular, the plural may also be construed.

It should be understood that, as used herein, the singular form "a" is intended to include the plural form as well, unless the context clearly supports an exception. It will also be understood that "and/or" as used herein is meant to include any and all possible combinations of one or more of the associated listed items.

The above-mentioned embodiments of the present invention disclose the serial numbers of the embodiments only for description, and do not represent the advantages and disadvantages of the embodiments.

Those of ordinary skill in the art should understand that the discussion of any of the above embodiments is only exemplary, and is not intended to imply that the scope (including the claims) disclosed by the embodiments of the present invention is limited to these examples; under the idea of the embodiments of the present invention , the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the above embodiments of the present invention, which are not provided in detail for the sake of brevity. Therefore, any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present invention should be included within the protection scope of the embodiments of the present invention.

Claims (10)

1. A monitoring method for a dual-phase cold plate liquid cooling system, wherein the method comprises: Acquiring the temperature of the refrigerant at the outlet of the circulating pump of the two-phase cold plate liquid cooling system and the power consumption of a CPU with an internal temperature sensor disposed near the evaporator of the two-phase cold plate liquid cooling system; Obtain the first CPU junction temperature of the CPU according to the temperature of the refrigerant at the outlet of the circulating pump and the power consumption of the CPU; Obtain the temperature of the second CPU node of the CPU through the internal temperature sensor; According to the change of the difference between the temperature of the first CPU junction and the temperature of the second CPU junction, the refrigerant leakage of the two-phase cold plate liquid cooling system is judged. 2 . The monitoring method for a dual-phase cold plate liquid cooling system according to claim 1 , wherein the judgment is based on a change in the difference between the first CPU junction temperature and the second CPU junction temperature. 3 . The refrigerant leakage of the two-phase cold plate liquid cooling system, including: When the difference between the first CPU junction temperature and the second CPU junction temperature is greater than a first preset value and remains for a preset time, it is determined that a slight refrigerant leakage occurs in the dual-phase cold plate liquid cooling system. 3 . The monitoring method of a dual-phase cold plate liquid cooling system according to claim 1 , wherein the judgment is based on a change in the difference between the first CPU junction temperature and the second CPU junction temperature. 4 . The refrigerant leakage of the two-phase cold plate liquid cooling system, including: When the first CPU junction temperature is higher than the second CPU junction temperature first, then the second CPU junction temperature increases rapidly and the difference between the second CPU junction temperature and the first CPU junction temperature is greater than the first CPU junction temperature. When two preset values are used, it is judged that serious refrigerant leakage occurs in the two-phase cold plate liquid cooling system. 4. The monitoring method for a dual-phase cold plate liquid cooling system according to claim 3, wherein the method further comprises: When it is judged that serious refrigerant leakage occurs in the dual-phase cold plate liquid cooling system, the dual-phase cold plate liquid cooling system is controlled to cut off the pipeline where the serious refrigerant leakage occurs. 5. The monitoring method for a dual-phase cold plate liquid cooling system according to claim 1, wherein the method further comprises: acquiring the temperature of multiple refrigerant pipe walls near multiple connectors of the two-phase cold plate liquid cooling system; The refrigerant leakage position is determined based on the plurality of refrigerant pipe wall temperatures. 6. A monitoring system for a dual-phase cold plate liquid cooling system, characterized in that, comprising: a plurality of temperature sensors, at least one of the plurality of sensors includes a refrigerant temperature sensor disposed at the outlet of the circulation pump of the two-phase cold plate liquid cooling system and configured to detect the temperature of the refrigerant; and A processing module, the processing module is at least configured to obtain the temperature of the refrigerant at the outlet of the circulating pump of the two-phase cold plate liquid cooling system and the temperature of the refrigerant with the internal temperature disposed near the evaporator of the two-phase cold plate liquid cooling system The power consumption of the CPU of the sensor; obtain the first CPU junction temperature of the CPU according to the refrigerant temperature at the outlet of the circulating pump and the power consumption of the CPU; obtain the second CPU section of the CPU through the internal temperature sensor and judge the refrigerant leakage of the dual-phase cold plate liquid cooling system according to the change in the difference between the first CPU junction temperature and the second CPU junction temperature. 7. The monitoring system for a liquid cooling system according to claim 6, wherein the processing module is further configured to: When the difference between the first CPU junction temperature and the second CPU junction temperature is greater than a first preset value and remains for a preset time, it is determined that a slight refrigerant leakage occurs in the dual-phase cold plate liquid cooling system. 8. The monitoring system for a liquid cooling system according to claim 6, wherein the processing module is further configured to: When the first CPU junction temperature is higher than the second CPU junction temperature first, then the second CPU junction temperature increases rapidly and the difference between the second CPU junction temperature and the first CPU junction temperature is greater than the first CPU junction temperature. When two preset values are used, it is judged that serious refrigerant leakage occurs in the two-phase cold plate liquid cooling system. 9. The monitoring system for a liquid cooling system according to claim 8, wherein the processing module is further configured to: When it is judged that serious refrigerant leakage occurs in the dual-phase cold plate liquid cooling system, the dual-phase cold plate liquid cooling system is controlled to cut off the pipeline where the serious refrigerant leakage occurs. 10 . The monitoring system for a liquid cooling system according to claim 6 , wherein the plurality of sensors further comprises a plurality of sensors disposed on the wall of the refrigerant pipe near the connector of the two-phase cold plate liquid cooling system. 11 . sensor, the processing module is further configured to: acquiring the temperature of multiple refrigerant pipe walls near multiple connectors of the two-phase cold plate liquid cooling system; The refrigerant leakage position is determined based on the plurality of refrigerant pipe wall temperatures.

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