US-12628318-B2 - Liquid cooling heat dissipation system, heat dissipation control method, and control chip

US12628318B2US 12628318 B2US12628318 B2US 12628318B2US-12628318-B2

Abstract

A liquid cooling heat dissipation system includes a control unit, a heat source box, and a heat dissipation unit. A temperature sensing unit is installed in the heat source box, and the temperature sensing unit and the control unit are connected for signal transmission. The heat dissipation unit includes an inlet and an outlet. Coolant flows into the heat dissipation unit through the inlet and flows out of the heat dissipation unit through the outlet. A flow regulating valve is disposed on a pipe at the inlet, and the flow regulating valve and the control unit are connected for signal transmission. The control unit obtains temperature information by using the temperature sensing unit, and determines lowest temperature T 1 and highest temperature T 2 based on the temperature information. The control unit is configured to control an opening degree of the flow regulating valve.

Inventors

Hui Jia
Junfeng Ding
CHENGJIAN WANG

Assignees

HUAWEI TECHNOLOGIES CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20220422
Priority Date: 20191022

Claims (19)

1 . A heat dissipation control method for a liquid cooling heat dissipation system, the heat dissipation control method comprising: obtaining temperature information of different locations in a heat source box from at least one temperature sensor, wherein the temperature information comprises a plurality of temperature values; determining a lowest temperature value of the temperature values and a highest temperature value of the temperature values; obtaining a temperature control parameter comprising a normal-temperature threshold and a high-temperature threshold; obtaining a humidity control parameter comprising a high-humidity threshold and a normal-humidity threshold; obtaining humidity information from at least one humidity sensor, wherein the humidity information comprises a plurality of humidity values; determining a highest humidity value of the humidity values; and controlling an opening degree of a flow regulating valve in the liquid cooling heat dissipation system, wherein the controlling comprises performing a control operation to maintain a current opening degree of the flow regulating valve in response to detection that the lowest temperature value is greater than the normal-temperature threshold, the highest temperature value is less than or equal to the high-temperature threshold, and the highest humidity value is less than or equal to the high-humidity threshold.
2 . The heat dissipation control method of claim 1 , wherein controlling the opening degree comprises performing the control operation to decrease the opening degree in response to detection that the lowest temperature value is less than or equal to the normal-temperature threshold.
3 . The heat dissipation control method of claim 1 , wherein the temperature control parameter further comprises a dew point temperature value, wherein controlling the opening degree comprises performing the control operation to decrease the opening degree in response to detection that the lowest temperature value is less than or equal to a first value corresponding to a sum of the dew point temperature value and N, and wherein N is a preset value.
4 . The heat dissipation control method of claim 1 , wherein the temperature control parameter further comprises a dew point temperature value, wherein controlling the opening degree comprises performing the control operation to maintain the current opening degree in response to detection that the highest temperature value is less than or equal to the high-temperature threshold and the lowest temperature value is greater than a sum of the dew point temperature value and N and wherein N is a preset value.
5 . The heat dissipation control method of claim 1 , wherein the at least one humidity sensor is in the heat source box.
6 . The heat dissipation control method of claim 1 , wherein the flow regulating valve is a proportional solenoid valve.
7 . The heat dissipation control method of claim 1 , wherein controlling the opening degree comprises performing the control operation to increase the opening degree in response to detection that the lowest temperature value is greater than the normal-temperature threshold, the highest temperature value is less than or equal to the high-temperature threshold, and the highest humidity value is less than or equal to the normal-humidity threshold.
8 . The heat dissipation control method of claim 1 , wherein the temperature control parameter further comprises a dew point temperature value, and wherein controlling the opening degree comprises: performing the control operation to maintain the current opening degree in response to detection that the lowest temperature value is greater than a sum of the dew point temperature value and N, the highest temperature value is less than or equal to the normal-temperature threshold, and the highest humidity value is less than or equal to the high-humidity threshold, wherein N is a preset value; performing the control operation to increase the opening degree in response to detection that the lowest temperature value is greater than the sum, the highest temperature value is greater than the normal-temperature threshold and less than or equal to the high-temperature threshold, and the highest humidity value is less than or equal to the normal-humidity threshold; or performing the control operation to maintain the current opening degree in response to detection that the lowest temperature value is greater than the sum, the highest temperature value is greater than the normal-temperature threshold and less than or equal to the high-temperature threshold, and the highest humidity value is greater than the normal-humidity threshold and less than or equal to the high-humidity threshold.
9 . The heat dissipation control method of claim 1 , wherein the temperature control parameter further comprises an alarm temperature threshold, and wherein the heat dissipation control method further comprises sending an alarm signal when the highest temperature value is greater than or equal to the alarm temperature threshold or the highest humidity value is greater than or equal to the high-humidity threshold.
10 . The heat dissipation control method of claim 1 , wherein controlling the opening degree comprises performing the control operation to increase the opening degree in response to detection that the highest temperature value is greater than the high-temperature threshold.
11 . The heat dissipation control method of claim 1 , wherein controlling the opening degree comprises performing the control operation to decrease the opening degree in response to detection that the lowest temperature value is greater than the normal-temperature threshold, the highest temperature value is less than or equal to the high-temperature threshold, and the highest humidity value is greater than the high-humidity threshold.
12 . The heat dissipation control method of claim 1 , wherein controlling the opening degree comprises performing the control operation to maintain the current opening degree in response to detection that the lowest temperature value is greater than the normal-temperature threshold, the highest temperature value is less than or equal to the high-temperature threshold, and the highest humidity value is greater than the normal-humidity threshold and less than or equal to the high-humidity threshold.
13 . The heat dissipation control method of claim 1 , wherein the humidity information comprises air supply humidity value.
14 . The heat dissipation control method of claim 1 , wherein the temperature control parameter further comprises a dew point temperature value, and wherein the dew point temperature value comprises a preset value.
15 . The heat dissipation control method of claim 1 , wherein the temperature control parameter further comprises a dew point temperature value, and wherein the dew point temperature value comprises a value of an external dew point collecting system.
16 . The heat dissipation control method of claim 1 , wherein the temperature control parameter further comprises a dew point temperature value, and wherein the dew point temperature value comprises an adjustable parameter value.
17 . The heat dissipation control method of claim 9 , further comprising prompting, based on the alarm signal, a user to check a temperature sensor or a humidity sensor in the liquid cooling heat dissipation system.
18 . The heat dissipation control method of claim 9 , wherein the alarm signal indicates that a temperature sensor or a humidity sensor is faulty.
19 . A chip system, comprising: a memory configured to store program instructions; and a processor coupled to the memory and configured to execute the program instructions to cause the chip system to: obtain, from at least one temperature sensor in a liquid cooling heat dissipation system, temperature information of different locations in a heat source box of the liquid cooling heat dissipation system, wherein the temperature information comprises a plurality of temperature values; determine a lowest temperature value of the temperature values and a highest temperature value of the temperature values; obtain a temperature control parameter comprising a normal-temperature threshold and a high-temperature threshold; obtain a humidity control parameter comprising a high-humidity threshold; obtain humidity information from at least one humidity sensor, wherein the humidity information comprises a plurality of humidity values; determine a highest humidity value of the humidity values; and control an opening degree of a flow regulating valve in the liquid cooling heat dissipation system, wherein to control the opening degree, the program instructions further cause the chip system to perform a control operation to maintain a current opening degree of the flow regulating valve in response to detection that the lowest temperature value is greater than the normal-temperature threshold, the highest temperature value is less than or equal to the high-temperature threshold, and the highest humidity value is less than or equal to the high-humidity threshold.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This is a continuation of International Patent Application No. PCT/CN2020/093621 filed on May 30, 2020, which claims priority to Chinese Patent Application No. 201911009501.5 filed on Oct. 22, 2019. The disclosures of the aforementioned applications are hereby incorporated by reference in their entireties. TECHNICAL FIELD This application relates to the field of cooling technologies, and in particular, to a liquid cooling heat dissipation system, a heat dissipation control method, and a control chip that are used in a communication device. BACKGROUND An air/liquid heat exchanger is widely used to resolve a heat dissipation problem of a communication device. A common scenario is to dissipate heat for a server cabinet. Generally, an air/liquid heat exchanger is disposed in a cabinet or beside the cabinet. Coolant flows into the air/liquid heat exchanger, and the air/liquid heat exchanger is in a low-temperature environment. Cold air in the low-temperature environment is blown to the cabinet by a fan, to dissipate heat for a board in the cabinet. However, when the air/liquid heat exchanger is used to dissipate heat for the cabinet, how to avoid condensation in the cabinet is a problem that needs to be considered with a high priority during design of a heat dissipation system. When temperature of incoming water in the air/liquid heat exchanger is low, for example, the temperature of the incoming water is 7° C. to 12° C., exhaust air blown into the cabinet may be only 15° C., but a dew point of the cabinet in this case may be near 20° C. The dew point, also referred to as dew point temperature, is generally marked as Td, and is temperature at which air is cooled to saturation when vapor content in the air is constant and atmospheric pressure is constant, that is, temperature at which vapor in the air is liquefied to form a water droplet. Therefore, when air at 15° C. is blown to the cabinet, temperature of some areas in the cabinet is lower than the dew point, and water droplets are formed in the cabinet. Consequently, a short-circuit fault on a board may be caused. To resolve a problem of condensation in the cabinet, in a conventional technology, generally, temperature of incoming water in the air/liquid heat exchanger is directly controlled to be greater than dew point temperature of an environment in which a device for which heat is to be dissipated is located, to avoid or reduce a condensation phenomenon. For example, there are the following two solutions. One solution is to control the temperature of the incoming water in the air/liquid heat exchanger by using a cooling tower. The cooling tower controls the temperature of the incoming water in the air/liquid heat exchanger by adjusting a bypass valve and a fan speed of the cooling tower, as shown in FIG. 1. In specific implementation, a temperature sensor detects temperature of output water of the cooling tower and controls the temperature of the output water of the cooling tower to be greater than dew point temperature in an equipment cabinet. When the temperature of the output water is lower than the dew point temperature, the fan speed of the cooling tower is reduced and the bypass valve is turned up to mix the output water with hot water, to increase the temperature of the output water. A disadvantage of this solution is that a chilled water scenario cannot be supported. To be specific, when only output water in a chilled water unit in the cabinet is available (temperature of the output water in the chilled water unit is usually 7° C. to 15° C., but a dew point range in a cabinet environment is 5.5° C. to 24° C.), and the cooling tower or a dry cooler cannot be connected, a condensation phenomenon easily occurs. The other solution is shown in FIG. 2. A chiller distribution unit (CDU) is added to a heat dissipation system, and temperature of incoming water in the air/liquid heat exchanger is controlled by using the CDU, so that the temperature of the incoming water is greater than a dew point of the cabinet. The CDU includes key components such as a plate heat exchanger and a pump, and is mainly used to control temperature of output water and provide fluid circulation power. A specific temperature control method is as follows: A temperature sensor monitors temperature of output water of the CDU. When the water temperature is lower than a target value, an opening degree of a bypass valve for fluid on the other side of the plate heat exchanger in the CDU is increased, so that fewer cooling mediums enter the plate heat exchanger. When the water temperature is greater than the target value, the bypass valve is turned down. Water on the other side of the CDU may be from a chilled water unit, or may be from a cooling tower, a dry cooler, or the like. The CDU serves as an additional temperature control device. Disadvantages of this solution are as follows: Costs are increased because a single set of CDU system is introduc