Data center liquid cooling heat recovery system and control method

Abstract

The present application relates to a data center liquid cooling heat recovery system and its control method, wherein the heat recovery system includes a system cabinet, a first heat exchange mechanism for high-grade heat recovery, a dry cooler, a second heat exchange mechanism for low-grade heat recovery, and a pipeline connecting the above devices; the pipeline carries refrigerant liquid and extends from the liquid outlet of the system cabinet, connecting to the first heat exchange mechanism through a first branch pipe and connecting to the dry cooler through a second branch pipe; the pipeline extends from the liquid outlet of the first heat exchange mechanism to a third branch pipe, which branches out into a fourth branch pipe connected to the dry cooler, and the third branch pipe branches out into a fifth branch pipe connected to the second heat exchange mechanism, the liquid outlet of the dry cooler is connected to the second heat exchange mechanism; the liquid outlet of the second heat exchange mechanism is connected to the system cabinet, completing the pipeline circulation; the first branch pipe, the second branch pipe, the fourth branch pipe, and the fifth branch pipe are respectively provided with a switch. The present application realizes flexible adjustment of the working mode and efficient utilization of various grades of thermal energy.

Description

Technical Field

[0001] The present application relates to the technical field of data center heat dissipation systems, and in particular to a data center liquid cooling heat recovery system and control method. Background Art

[0002] Liquid cooling in data centers often involves installing refrigeration units for efficient cooling. However, this approach presents challenges with the construction cycle and cost of the primary-side piping. Furthermore, in low-temperature conditions such as winter, the data center's liquid cooling system can achieve excellent cooling effects simply by using ambient temperature. In these cases, cooling is often controlled manually by switching the heat exchanger on and off. However, this type of cooling control is difficult to flexibly adjust for automated heat recovery systems.

[0003] At the same time, in the treatment method of heat recovery in data centers, only high-grade heat is often recovered, while low-grade heat is often directly abandoned due to the difficulty in recycling, resulting in some waste of thermal energy. Summary of the Invention

[0004] In order to solve the above technical problems, the present application discloses a liquid cooling heat recovery system for a data center, comprising a system cabinet, a first heat exchange mechanism for high-grade heat recovery, a dry cooler for air pre-cooling, a second heat exchange mechanism for low-grade heat recovery, and a pipeline connecting the above devices; the pipeline carries a refrigerant liquid for absorbing heat and extends from the liquid outlet of the system cabinet, is connected to the first heat exchange mechanism with a first branch pipe, and is connected to the dry cooler with a second branch pipe; the pipeline extends a third branch pipe from the liquid outlet of the first heat exchange mechanism, the third branch pipe branches out a fourth branch pipe connected to the dry cooler, the third branch pipe branches out a fifth branch pipe connected to the second heat exchange mechanism, and the liquid outlet of the dry cooler is connected to the second heat exchange mechanism; the liquid outlet of the second heat exchange mechanism is connected to the system cabinet, completing the pipeline circulation; the first branch pipe, the second branch pipe, the fourth branch pipe and the fifth branch pipe are respectively provided with switches.

[0005] Through the above technical solution, it is possible to flexibly adjust the coordinated working relationship between the pipelines and achieve different refrigerant transportation paths.

[0006] Furthermore, the first heat exchange mechanism includes a first heat exchanger and domestic water. The domestic water flows out from a pipeline, and part of the water circulates in the first heat exchanger to cool the refrigerant liquid in the first heat exchanger.

[0007] The first heat exchanger includes a plate heat exchanger, and the first heat exchange mechanism receives the refrigerant liquid exported from the system cabinet and introduces the refrigerant liquid into the plate heat exchanger; the domestic water includes a water inlet and a water outlet, and the water inlet and the water outlet are both connected to the plate heat exchanger. After the refrigerant liquid is cooled by the domestic water in the plate heat exchanger, it is discharged from the plate heat exchanger to the third branch pipe.

[0008] The dry cooler includes a heat-conducting air duct for transporting heat energy. The heat-conducting air duct is connected to the heat pump unit to input low-grade heat energy into the heat pump unit. The heat pump unit converts the low-grade heat energy into high-grade heat energy and transports it to the domestic water pipeline for heating domestic water supply.

[0009] The second heat exchange mechanism includes a liquid storage tank for storing refrigerant liquid and stabilizing its pressure, a second heat exchanger, and a cooling tower. The liquid storage tank includes two liquid inlets and one liquid outlet. The second heat exchanger includes a liquid inlet and a liquid outlet. The liquid inlet of the liquid storage tank is respectively connected to the first heat exchange mechanism and the dry cooler. The liquid outlet of the liquid storage tank is connected to the liquid inlet of the second heat exchanger, and the liquid outlet of the second heat exchanger is connected to the system cabinet. The cooling tower includes a liquid outlet and a liquid inlet, both of which are interconnected with the second heat exchanger to circulate coolant. The liquid outlet of the liquid storage tank is connected to the second heat exchanger, which is also a plate heat exchanger. Heat exchange is performed through this heat exchanger to increase the contact area and improve heat exchange efficiency. The liquid outlet of the second heat exchanger is connected to the cooling tower for heat absorption.

[0010] The third branch pipe is provided with a first temperature detection device for measuring the temperature of the refrigerant liquid, which is used to detect the temperature of the refrigerant liquid to determine the degree to which the refrigerant liquid is cooled.

[0011] A second temperature detection device is included for detecting air temperature, which is used to detect the ambient temperature to adjust the control method.

[0012] This application also discloses a control method for a data center liquid cooling heat recovery system, comprising the following steps:

[0013] Step 1: Detect and receive ambient temperature information;

[0014] Step 2: When the ambient temperature is less than or equal to 10 degrees Celsius, the refrigerant liquid that has absorbed the heat from the system cabinet is introduced into the first heat exchange mechanism for cooling, and then the temperature of the cooled refrigerant liquid is detected;

[0015] Step 3: Determine the refrigerant liquid temperature. If the temperature is greater than or equal to 45 degrees Celsius, pre-cool the refrigerant liquid with air, further cool it through the second heat exchange mechanism, and then re-introduce it into the system cabinet, returning to step 1.

[0016] Step 3: Determine the refrigerant liquid temperature. If the temperature is less than 45 degrees Celsius, introduce the refrigerant liquid into the dry cooler for air pre-cooling. After further cooling through the second heat exchange mechanism, re-introduce the refrigerant into the system cabinet and return to step 1.

[0017] Step 4: When the ambient temperature is greater than 10 degrees Celsius, the refrigerant liquid is introduced into the dry cooler for air pre-cooling, and then further cooled by the second heat exchange mechanism, and then re-introduced into the system cabinet, and return to step 1.

[0018] Beneficial effects: ① Flexible adjustment of working mode: The circulation path is flexibly adjusted according to the temperature conditions and the temperature of the refrigerant in the pipeline. When the temperature is low, only the dry cooler and the second heat exchange mechanism are used for cooling, which effectively saves equipment resources; when the temperature is high, the first heat exchange mechanism is used first for high-grade heat exchange, and then according to the temperature of the refrigerant after the exchange, it is decided whether to pass through the dry cooler for low-grade heat exchange; the path layout is very flexible and can be adjusted according to various situations; ② Efficient utilization of various grades of thermal energy: By passing the refrigerant through the first heat exchange mechanism, the dry cooler and the second heat exchange mechanism in turn, it is possible to achieve efficient absorption and utilization of various grades of thermal energy; ③ Environmental protection and energy saving: The domestic water pipeline is connected through the first heat exchange mechanism, and high-grade thermal energy is directly used for domestic water heating; heat is transferred to the heat pump unit through the dry cooler, and the low-grade thermal energy is increased to high-grade thermal energy, which is also used for domestic water heating, effectively utilizing various grades of energy to achieve energy saving and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of a heat recovery system in an embodiment of the present application;

[0020] Figure 2 Schematic diagram of pipeline connection in the embodiment of the present application;

[0021] Figure 3 This is a flow chart of the heat recovery method of this application. DETAILED DESCRIPTION

[0022] The present application will now be described in further detail with reference to the accompanying drawings.

[0023] like Figure 1 and Figure 2 As shown, the pipeline is first installed inside the system cabinet 1, and the refrigerant liquid is guided in the pipeline to cool the unit; the pipeline is first connected from the system cabinet 1 to the intermediate node between the first heat exchange mechanism 2 and the dry cooler 3, and a second temperature measuring device for measuring the air temperature is also installed on this pipe section; after passing through this pipe section, the pipeline includes a first branch pipe 5 connected to the first heat exchange mechanism 2 and a second branch pipe 6 connected to the dry cooler 3, and both of the above pipe sections are equipped with an electromagnetically controlled switch 16; a second temperature detection device is also provided near the system cabinet to detect the ambient temperature.

[0024] The first heat exchange mechanism 2 includes a first heat exchanger 10 and domestic water 11. The first heat exchanger 10 is a plate-type heat exchanger. The first heat exchanger 10 includes a pump body and a plate-type liquid storage device. After transferring the refrigerant liquid to the domestic water pipeline 11 for cooling, the cooled refrigerant liquid is recovered. The first heat exchange mechanism 2 discharges the cooled refrigerant liquid through the third branch pipe 7, branches out into the fourth branch pipe 8, and transfers it to the dry cooler 3. The third branch pipe 7 branches out into the fifth branch pipe 9, which transfers it to the second heat exchange mechanism 4. The fourth branch pipe 8 and the fifth branch pipe 9 are both equipped with electromagnetically controlled switches 16. The dry cooler 3 is also connected to the second heat exchange mechanism 4 via a pipeline. A heat conduction duct is provided outside the dry cooler 3, enclosing the dry cooler 3 and used to transfer heat energy. The heat conduction duct transfers the heat energy emitted by the dry cooler 3 to the heat pump unit 12. The heat pump unit 12 generates heat in conjunction with the collected low-grade heat energy, which is then transferred to the domestic water 11 for heating. The third branch pipe 7 is provided with a first temperature detection device 16 for detecting the temperature of the refrigerant liquid after being cooled by the first heat exchange mechanism 2.

[0025] Another example Figure 1 As shown, the second heat exchange mechanism 4 includes a liquid storage tank 13 for storing refrigerant liquid and stabilizing the flow and pressure, a second heat exchanger 14, namely a plate heat exchanger, and a cooling tower 15. The above-mentioned first heat exchange mechanism 2 and the dry cooler 3 are connected to the liquid storage tank 13 of the second heat exchange mechanism 4 through a pipeline. After a pipeline is passed from the liquid storage tank 13 to the second heat exchanger 14, the cooled refrigerant liquid is transmitted back to the system cabinet 1 to complete the heat exchange cycle; among them, the cooling tower 15 is interconnected with the second heat exchanger 14 through a pipeline, and uses groundwater for circulation cooling.

[0026] Specific operation examples are as follows: Example 1 (air temperature is less than or equal to 10 degrees Celsius): The refrigerant liquid first flows through the pipeline from the 1 system cabinet through the second temperature detection device for temperature detection. When the temperature is less than or equal to 10 degrees Celsius, it is judged that the air temperature is low. At this time, the switch of the pipeline leading to the 3 dry cooler is opened, and the switch leading to the 2 first heat exchange mechanism is closed. The refrigerant liquid is cooled only by the 3 dry cooler and then transported to the 4 second heat exchange mechanism for further cooling. After steady flow and constant pressure, it is transmitted to the 1 system cabinet through the liquid storage tank for circulating liquid cooling.

[0027] Example 2 (air temperature is higher than 10 degrees Celsius, and the return temperature in the first heat exchange mechanism is lower than 45 degrees Celsius): The refrigerant liquid first flows through the second temperature detection device from the system cabinet 1 through the pipeline. When the temperature is higher than 10 degrees Celsius, the switch in the pipeline leading to the dry cooler 3 is closed, and the switch leading to the first heat exchange mechanism 2 is opened. The refrigerant liquid first passes through the first heat exchange mechanism 2 for high-quality heat energy exchange and cooling. In the process of returning to the first heat exchanger 10 through the domestic water pipeline 11, it passes through the first temperature detection device 16. When the temperature is lower than 45 degrees Celsius, it is determined that the refrigerant liquid no longer needs air cooling. Therefore, the electromagnetic switch on the fourth branch pipe 8 is closed, and the electromagnetic switch on the fifth branch pipe 9 is opened, allowing the refrigerant liquid to flow from the first heat exchange mechanism 2 to the second heat exchange mechanism 4 for further cooling. After the flow and pressure are stabilized in the second heat exchange mechanism 4, it is transmitted to the system cabinet 1 for circulating liquid cooling.

[0028] Example 3 (the air temperature is higher than 10 degrees Celsius, and the return temperature in the first heat exchange mechanism is greater than or equal to 45 degrees Celsius): The refrigerant liquid first flows through the second temperature detection device from the system cabinet 1 through the pipeline. When the temperature is higher than 10 degrees Celsius, the switch in the direction of the pipeline leading to the dry cooler 3 is closed, and the switch leading to the first heat exchange mechanism 2 is opened; the refrigerant liquid first undergoes high-quality heat energy exchange through the first heat exchange mechanism 2. In the process of returning from the domestic water 11 to the first heat exchanger 10, it passes through the first temperature detection device 16. When the temperature is greater than or equal to 45 degrees Celsius, it is determined that the refrigerant liquid still needs to be air-cooled. Therefore, the electromagnetic switch on the fourth branch pipe 8 is opened, and the electromagnetic switch on the fifth branch pipe 9 is closed. The refrigerant liquid is transported to the dry cooler 3 for air-cooling, and then transported to the second heat exchange mechanism 4 for further cooling. After steady flow and pressure are maintained in the liquid storage tank, it is transmitted to the system cabinet 1 for circulating liquid cooling.

Claims

1. A data center liquid cooling heat recovery system, characterized in that: The invention comprises a system cabinet (1), a first heat exchange mechanism (2) for high-grade heat recovery, a dry cooler (3) for air pre-cooling, a second heat exchange mechanism (4) for low-grade heat recovery, and a pipeline connecting the above devices; the pipeline carries a refrigerant liquid for absorbing heat and extends from the liquid outlet of the system cabinet (1), is connected to the first heat exchange mechanism (2) through a first branch pipe (5), and is connected to the dry cooler (3) through a second branch pipe (6); the pipeline extends from the liquid outlet of the first heat exchange mechanism (2) to a third branch pipe (7), the third branch pipe (7) branches out a fourth branch pipe (8) connected to the dry cooler (3), the third branch pipe (7) branches out a fifth branch pipe (9) connected to the second heat exchange mechanism (4), and the dry cooler (3) is connected to the second heat exchange mechanism (4). The liquid outlet of the dry cooler (3) is connected to the second heat exchange mechanism (4); the liquid outlet of the second heat exchange mechanism (4) is connected to the system cabinet (1), completing the pipeline circulation; the first branch pipe (5), the second branch pipe (6), the fourth branch pipe (8) and the fifth branch pipe (9) are respectively provided with a switch (17); the first heat exchange mechanism (2) includes a first heat exchanger (10) and domestic water (11), and the domestic water (11) circulates to cool the refrigerant liquid in the first heat exchanger (10); the dry cooler (3) includes a heat-conducting air duct for transporting heat energy, and the heat-conducting air duct is connected to the heat pump unit (12), and the heat pump unit (12) lifts and transports heat energy to the domestic water pipeline (11); The second heat exchange mechanism (4) comprises a liquid storage tank (13) for storing refrigerant liquid and stabilizing its pressure, a second heat exchanger (14) and a cooling tower (15); the liquid storage tank (13) comprises two liquid inlets and one liquid outlet; the second heat exchanger (14) comprises a liquid inlet and a liquid outlet; the liquid inlet of the liquid storage tank is respectively connected to the first heat exchange mechanism (2) and the dry cooler (3); the liquid outlet of the liquid storage tank (13) is connected to the liquid inlet of the second heat exchanger (14); the liquid outlet of the second heat exchanger (14) leads to the system cabinet (1); the cooling tower (15) comprises a liquid outlet and a liquid inlet, both of which are interconnected with the second heat exchanger (14) to circulate coolant.

2. The heat recovery system according to claim 1, characterized in that The first heat exchanger (10) includes a plate heat exchanger, and the first heat exchange mechanism (2) receives the refrigerant liquid discharged from the system cabinet (1) and introduces the refrigerant liquid into the plate heat exchanger; the domestic water (11) includes a water inlet and a water outlet, and the water inlet and the water outlet are both connected to the plate heat exchanger.

3. The heat recovery system according to claim 1, characterized in that The third branch pipe (7) is provided with a first temperature detection device (16) for measuring the temperature of the refrigerant liquid.

4. The heat recovery system according to claim 1, characterized in that A second temperature detection device is included for detecting the air temperature.

5. A control method for a data center liquid cooling heat recovery system according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: Detect and receive ambient temperature information; Step 2: When the ambient temperature is greater than or equal to 10 degrees Celsius, the refrigerant liquid that has absorbed the heat from the system cabinet is introduced into the first heat exchange mechanism for cooling, and then the temperature of the cooled refrigerant liquid is detected; Step 3: Determine the refrigerant liquid temperature. If the temperature is greater than or equal to 45 degrees Celsius, pre-cool the refrigerant liquid with air, further cool it through the second heat exchange mechanism, and then re-introduce it into the system cabinet, returning to step 1. Step 3: Determine the refrigerant liquid temperature. If the temperature is less than 45 degrees Celsius, introduce the refrigerant liquid into the second heat exchange mechanism for further cooling, then re-introduce it into the system cabinet and return to step 1. Step 4: When the ambient temperature is less than 10 degrees Celsius, the refrigerant liquid is introduced into the dry cooler for air pre-cooling, and then further cooled by the second heat exchange mechanism, and then re-introduced into the system cabinet, and return to step 1.

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