Data center natural cold source cross-time-scale cooperative utilization system

Abstract

The invention discloses a data center natural cold source cross-time scale collaborative utilization system which comprises a chilled water return pipeline of a machine room air conditioner, the chilled water return pipeline is divided into three paths, the first path is connected with a first cooling tower, the second path is connected with a water-cooling water chilling unit, and the third path is connected with a buried pipe; the water outlet end of the first cooling tower is divided into three paths, the first path flows back to the machine room air conditioner, the second path is connected with the water-cooling water chilling unit, and the third path is connected with the buried pipe; the water-cooling water chilling unit comprises an evaporator and a condenser, return water at the output end of the evaporator flows back to the machine room air conditioner, the output end of the condenser is divided into two paths, one path is connected to the second cooling tower, and the other path is connected with the buried pipe; the output end of the buried pipe is divided into three paths, the first path flows back to the machine room air conditioner, the second path is connected to the third cooling tower, and the third path is connected to an evaporator in the water-cooling water chilling unit. The use of the water chilling unit is reduced, and the energy consumption and the PUE value are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of utilization and control of natural cold sources in data centers, and particularly to a system for collaborative utilization of natural cold sources in data centers across time scales. Background Art

[0002] With the rapid development of information technology, the scale of data centers has been continuously expanding. As high-energy-consuming intensive facilities, the energy consumption of the cooling systems in data centers accounts for 30%-45% of the total electricity consumption. Making full use of natural cold sources in data centers is an effective way to reduce PUE (Power Usage Effectiveness), which meets the requirements of strengthening energy conservation and consumption reduction, and has a very wide range of application fields and great value.

[0003] At present, multi-natural cold source utilization technologies have been widely applied because they can reduce the energy consumption of data center cooling systems. However, many technical problems still emerge during actual operation. For example, in the patent application No. CN202411671882.4, "An Energy-saving System for Data Centers" is disclosed. In this existing patent, it is mentioned to utilize the low-temperature resources of the external natural environment and introduce external cold sources through air-cooled or water-cooled systems to achieve energy conservation. However, in the actual operation process, natural cold sources have the characteristics of large quality differences and dynamic changes. On the one hand, the natural cold sources in different regions, such as air, soil, water, etc., have different parameters such as temperature and humidity, which increases the difficulty of utilizing cold sources. On the other hand, the parameters of natural cold sources also change in different seasons and different time periods. That is to say, each natural cold source presents a dynamic change state in the entire time dimension, resulting in difficulty in stably meeting the cooling demand of data centers. Therefore, how to fully and efficiently utilize natural cold sources has become the key to restricting the green development of data centers. Summary of the Invention

[0004] The present invention provides a system for collaborative utilization of natural cold sources in data centers across time scales, aiming to solve the technical problems existing in the prior art in the above-mentioned background art.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides a system for collaborative utilization of natural cold sources in data centers across time scales, including: computer room air conditioners, cooling towers, water-cooled chillers, and double U-shaped buried pipes; wherein the cooling towers include a first cooling tower, a second cooling tower, and a third cooling tower;

[0007] The chilled water return pipe of the computer room air conditioner is divided into three paths. Among them, the first path is connected to the first cooling tower through a water pump, the second path is connected to the water-cooled chiller, and the third path is connected to the double U-shaped buried pipe through a water pump;

[0008] The water outlet end of the first cooling tower is divided into three paths. The first path returns the cooled chilled water return to the computer room air conditioner. The second path is connected to the water-cooled chiller through a water pipe. The third path is connected to the double U-shaped buried pipe through a water pipe.

[0009] The water-cooled chiller includes an evaporator and a condenser. The output end of the evaporator returns the cooled chilled water return to the computer room air conditioner. The output end of the condenser is divided into two paths. One path is connected to the second cooling tower through a water pipe, and the other path is connected to the double U-shaped buried pipe through a water pipe.

[0010] The output end of the double U-shaped buried pipe is divided into three paths. The first path returns the cooled chilled water return to the computer room air conditioner. The second path is connected to the third cooling tower through a water pipe. The third path is connected to the evaporator in the water-cooled chiller through a water pipe.

[0011] As a further technical solution, when the system is for independent cooling of the cooling tower, the chilled water return of the computer room air conditioner is transported to the first cooling tower by a water pump. The first cooling tower cools the chilled water return through the outdoor low-temperature air and then returns it to the computer room air conditioner. At the same time, when the outdoor temperature can reach the soil cold storage condition, the circulating water carrying the soil heat in the double U-shaped buried pipe is transported to the third cooling tower. The third cooling tower cools it using the outdoor low-temperature air and then transports it back to the double U-shaped buried pipe for soil cold storage.

[0012] As a further technical solution, when the system is for pre-cooling the soil by the cooling tower for cooling, the chilled water return of the computer room air conditioner is transported to the first cooling tower by a water pump. The first cooling tower pre-cools it through the outdoor low-temperature air, and then enters the double U-shaped buried pipe to cool it again and then supply it to the computer room air conditioner.

[0013] As a further technical solution, when the system is for cooling by the cooling tower with double pre-cooling of the soil and the chiller, the chilled water return of the computer room air conditioner is transported to the first cooling tower by a water pump. The first cooling tower pre-cools it through the outdoor low-temperature air, enters the double U-shaped buried pipe to pre-cool it twice, then flows through the evaporator of the water-cooled chiller, and then supplies it to the computer room air conditioner. And the cooling water of the condenser in the water-cooled chiller is cooled by heat exchange with the outdoor low-temperature air through the second cooling tower.

[0014] As a further technical solution, when the system is for cooling by the cooling tower with pre-cooling of the chiller, the chilled water return of the computer room air conditioner is transported to the first cooling tower by a water pump and pre-cooled through the outdoor low-temperature air, and then enters the evaporator of the water-cooled chiller to supplement the required cooling capacity and then supply it to the computer room air conditioner. When the outdoor ambient temperature is lower than the soil temperature, the cooling water of the condenser in the water-cooled chiller is cooled by heat exchange with the outdoor low-temperature air through the second cooling tower.

[0015] As a further technical solution, the circulating water carrying the soil heat in the double U-shaped buried pipes is transported to the third cooling tower, cooled by the low-temperature outdoor air, and then transported back to the double U-shaped buried pipes; when the outdoor ambient temperature is higher than the soil temperature, the cooling water of the condenser in the water-cooled chiller is cooled by exchanging heat with the soil through the double U-shaped buried pipes.

[0016] As a further technical solution, when the system is soil independent cooling, the chilled water return of the computer room air conditioner is transported to the double U-shaped buried pipes by a water pump, cooled by the soil, and then supplied to the computer room air conditioner.

[0017] As a further technical solution, when the system is soil precooling chiller cooling, the chilled water return of the computer room air conditioner is transported to the double U-shaped buried pipes by a water pump, precooled by the soil, then enters the evaporator of the water-cooled chiller, and after supplementing the required cooling capacity, it is supplied to the computer room air conditioner; and the cooling water of the condenser in the water-cooled chiller is cooled by exchanging heat with the low-temperature outdoor air through the second cooling tower.

[0018] As a further technical solution, when the system is chiller independent cooling, the chilled water return of the computer room air conditioner is transported to the evaporator of the water-cooled chiller to supplement the required cooling capacity and then supplied to the computer room air conditioner; when the outdoor ambient temperature is lower than the soil temperature, the cooling water of the condenser in the water-cooled chiller is cooled by exchanging heat with the outdoor air through the second cooling tower.

[0019] As a further technical solution, the circulating water carrying the soil heat in the double U-shaped buried pipes is transported to the third cooling tower, cooled by the low-temperature outdoor air, and then transported back to the double U-shaped buried pipes to store cold through the soil; when the outdoor ambient temperature is higher than the soil temperature, the cooling water of the condenser in the water-cooled chiller is cooled by exchanging heat with the soil through the double U-shaped buried pipes.

[0020] One or more technical solutions of the present invention have the following beneficial effects:

[0021] 1. The system provided by the present invention collaboratively utilizes natural cold sources of air and soil by designing computer room air conditioners, water-cooled chillers, multiple cooling towers, double U-shaped buried pipes, etc. In different seasons and time periods, according to the differences in outdoor temperature and soil temperature, 7 operating modes are switched. On the premise that the soil does not participate in cooling, when the outdoor temperature is low, the cooling tower is used to store the cold in the air in the soil, effectively integrating the collaborative potential of soil cold storage and air cooling, solving the thermal accumulation effect of the soil cold source system, and improving the utilization rate of natural cold sources. The use of chillers is reduced, and energy consumption and PUE value are lowered. The system structure of the present invention is flexible, and 7 operating modes meet different working conditions. When the load of the data center changes or the outdoor environment fluctuates, it can quickly switch to a suitable mode. When the outdoor temperature drops suddenly, it switches from independent cooling by the chiller to independent cooling by the cooling tower, ensuring the stable operation of the data center and improving the applicability and reliability of the system.

[0022] 2. The present invention makes multi-condition judgments and feedback adjustments based on real-time monitoring parameters. By monitoring various parameters such as outdoor environmental temperature, cooling tower inlet and outlet flow rates and temperatures, and air-conditioning refrigeration supply and return water temperatures, the appropriate cooling mode is selected according to different conditions, and the operating parameters of the equipment are adjusted in a timely manner, such as the flow rate of the variable-frequency water pump and the frequency of the chiller compressor, etc., to achieve precise matching of the cooling capacity and the actual demand of the data center, and avoid the situation of overcooling or insufficient cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings forming a part of this specification are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0024] Figure 1 is the schematic diagram of the system for collaborative utilization of natural cold sources across time scales in the data center of the present invention;

[0025] Figure 2 is the flow chart of the system for collaborative utilization of natural cold sources across time scales in the data center of the present invention;

[0026] Wherein: 1. Computer room air conditioner; 2. First cooling tower; 3. Double U-shaped buried pipe; 4. Third cooling tower; 5. Water-cooled chiller; 6. Second cooling tower; 7. Solenoid valve; 8. Solenoid valve; 9. Water pump; 10. Solenoid valve; 11. Solenoid valve; 12. Solenoid valve; 13. Solenoid valve; 14. Water pump; 15. Solenoid valve; 16. Solenoid valve; 17. Water pump; 18. Solenoid valve; 19. Solenoid valve; 20. Solenoid valve; 21. Water pump; 22. Solenoid valve; 23. Solenoid valve; 24. Solenoid valve; 25. Water pump; 26. Solenoid valve; 27. Solenoid valve. DETAILED DESCRIPTION OF THE INVENTION

[0027] It should be noted that the following detailed description is illustrative and aims to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention pertains.

[0028] Embodiment 1

[0029] This embodiment provides a system for collaborative utilization of natural cold sources in a data center across time scales, as Figure 1 shown, including: a computer room air conditioner 1, a cooling tower, a water-cooled chiller 5, a double U-shaped ground heat exchanger 3, and several water pumps, solenoid valves, temperature sensors, and mass flow meters. Among them, the cooling tower includes a first cooling tower 2, a second cooling tower 6, and a third cooling tower 4.

[0030] As Figure 1 shown, the chilled water return pipe of the computer room air conditioner 1 is divided into three paths. The first path is connected to the first cooling tower 2 through a water pump, the second path is connected to the water-cooled chiller 5, and the third path is connected to the double U-shaped ground heat exchanger 3 through a water pump; the outlet end of the first cooling tower 2 is divided into three paths. The first path returns the cooled chilled water return to the computer room air conditioner 1, the second path is connected to the water-cooled chiller 5 through a water pipe, and the third path is connected to the double U-shaped ground heat exchanger 3 through a water pipe; the water-cooled chiller 5 includes an evaporator and a condenser. The output end of the evaporator returns the cooled chilled water return to the computer room air conditioner 1, and the output end of the condenser is divided into two paths. One path is connected to the second cooling tower 6 through a water pipe, and the other path is connected to the double U-shaped ground heat exchanger 3 through a water pipe; the output end of the double U-shaped ground heat exchanger 3 is divided into three paths. The first path returns the cooled chilled water return to the computer room air conditioner 1, the second path is connected to the third cooling tower 4 through a water pipe, and the third path is connected to the evaporator in the water-cooled chiller 5 through a water pipe.

[0031] In this embodiment, the provided system for collaborative utilization of natural cold sources in a data center across time scales has 7 operating modes according to the matching relationship between the cold source quality of outdoor low-temperature air and soil and the cooling demand of the data center, including independent cooling by the cooling tower, pre-cooling the soil by the cooling tower for cooling, double pre-cooling the chiller by the cooling tower and soil, pre-cooling the chiller by the cooling tower, independent cooling by the soil, pre-cooling the chiller by the soil, and independent cooling by the chiller.

[0032] When the system is in the independent cooling mode of the cooling tower, the chilled water return of the computer room air conditioner 1 is transported to the first cooling tower 2 through a water pump. The first cooling tower 2 cools the chilled water return with outdoor low-temperature air and then returns it to the computer room air conditioner 1 to meet the cooling demand of the data center; at the same time, when the outdoor temperature can reach the soil cold storage condition, the circulating water carrying the soil heat in the double U-shaped ground heat exchanger 3 is transported to the third cooling tower 4. The third cooling tower 4 cools it with outdoor low-temperature air and then transports it back to the double U-shaped ground heat exchanger 3 for soil cold storage.

[0033] When the system is in the cooling mode of pre-cooling the soil by the cooling tower, the return chilled water of the computer room air conditioner 1 is transported to the first cooling tower 2 by a water pump. After being pre-cooled by the low-temperature outdoor air in the first cooling tower 2, it enters the double U-shaped buried pipe 3 through a water pipe for secondary cooling and then is supplied to the computer room air conditioner 1 to meet the cooling demand of the data center.

[0034] When the system is in the cooling mode of pre-cooling the soil and the chiller by the cooling tower, the return chilled water of the computer room air conditioner 1 is transported to the first cooling tower 2 by a water pump. After being pre-cooled by the low-temperature outdoor air in the first cooling tower 2, it enters the double U-shaped buried pipe 3 for secondary pre-cooling, then flows through the evaporator of the water-cooled chiller 5, and after supplementing the required cooling capacity as needed, it is supplied to the computer room air conditioner 1 to meet the cooling demand of the data center; and the cooling water of the condenser in the water-cooled chiller 5 is cooled by heat exchange with the low-temperature outdoor air through the second cooling tower.

[0035] When the system is in the cooling mode of pre-cooling the chiller by the cooling tower, the return chilled water of the computer room air conditioner 1 is transported to the first cooling tower 2 by a water pump and pre-cooled by the low-temperature outdoor air, then enters the evaporator of the water-cooled chiller 5 to supplement the required cooling capacity and is then supplied to the computer room air conditioner to meet the cooling demand of the data center; when the outdoor ambient temperature is lower than the soil temperature, the cooling water of the condenser in the water-cooled chiller is cooled by heat exchange with the low-temperature outdoor air through the second cooling tower; at the same time, the circulating water carrying the soil heat in the double U-shaped buried pipe is transported to the third cooling tower, cooled by the low-temperature outdoor air and then transported back to the double U-shaped buried pipe to store cold using the soil; when the outdoor ambient temperature is higher than the soil temperature, the cooling water of the condenser in the water-cooled chiller is cooled by heat exchange with the soil through the double U-shaped buried pipe.

[0036] When the system is in the mode of independent soil cooling, the return chilled water of the computer room air conditioner 1 is transported to the double U-shaped buried pipe 3 by a water pump, cooled by the soil and then supplied to the computer room air conditioner 1 to meet the cooling demand of the data center.

[0037] When the system is in the cooling mode of pre-cooling the soil and the chiller, the return chilled water of the computer room air conditioner 1 is transported to the double U-shaped buried pipe 3 by a water pump, pre-cooled by the soil, then enters the evaporator of the water-cooled chiller 5, and after supplementing the required cooling capacity, it is supplied to the computer room air conditioner 1 to meet the cooling demand of the data center; and the cooling water of the condenser in the water-cooled chiller 5 is cooled by heat exchange with the low-temperature outdoor air through the second cooling tower.

[0038] When the system is in the mode of independent cooling by the chiller, the return chilled water of the computer room air conditioner 1 is transported to the evaporator of the water-cooled chiller 5 to supplement the required cooling capacity, and then supplied to the computer room air conditioner 1 to meet the cooling demand of the data center; when the outdoor ambient temperature is lower than the soil temperature, the cooling water of the condenser in the water-cooled chiller is cooled by exchanging heat with the outdoor air through the second cooling tower; at the same time, the circulating water carrying the soil heat in the double U-shaped buried pipe is transported to the third cooling tower, cooled by the outdoor low-temperature air and then transported back to the double U-shaped buried pipe for cold storage through the soil; when the outdoor ambient temperature is higher than the soil temperature, the cooling water of the condenser in the water-cooled chiller is cooled by exchanging heat with the soil through the double U-shaped buried pipe.

[0039] Embodiment 2

[0040] In the regulation method of the data center natural cold source cross-time-scale collaborative utilization system mentioned in this embodiment, it is based on the data center natural cold source cross-time-scale collaborative utilization system described in Embodiment 1, as Figure 2 shown. The specific regulation method is as follows:

[0041] Monitor the outdoor ambient temperature T a , the inlet and outlet flow rate m a of the first cooling tower 2, the outlet temperature T out of the first cooling tower 2, the return water temperature T2 of the computer room air conditioner 1 for refrigeration, the temperature T n of the double U-shaped buried pipe 3, the inlet and outlet flow rate m b of the double U-shaped buried pipe 3 during cold supply, the outlet temperature T f of the double U-shaped buried pipe 3 during cold supply, the inlet and outlet flow rate m c of the evaporator in the water-cooled chiller 5, and the outlet temperature T z of the evaporator in the water-cooled chiller 5.

[0042] According to the outdoor ambient temperature T a , the return water temperature T2 of the computer room air conditioner 1 for refrigeration, if T2 - T a > x (for example, x = 2 °C), where x is the lowest threshold value (determined by experiments) at which the outdoor low-temperature air can provide effective cooling capacity for the data center, then the first cooling tower 2 can cool the data center, open the corresponding solenoid valves 7, 8 and the water pump 9, and according to the outlet temperature T out of the first cooling tower 2, if < c (for example, T x = 18 °C, c = 0.02), where T x is the air-conditioning water supply temperature set to meet the refrigeration demand of the data center, and c is the error limit set to meet the refrigeration demand (determined by experiments), then the first cooling tower 2 can independently provide the required cooling capacity for the data center and enter the independent cooling mode of the cooling tower. If T x - Tout >T s (such as T s = 2 °C), where T s is the minimum error temperature between the water supply temperature and the set water supply temperature T when the cold source supplies cooling, and the cooling capacity provided by the first cooling tower 2 is more than the cooling demand of the data center. Adjust the water pump 9 at the end of the first cooling tower 2 to change the inlet and outlet flow rate m x of the first cooling tower 2 to satisfy T a -T x <T out ; if T s -T x <T out , then the cooling capacity of the first cooling tower 2 is adapted to the cooling demand of the data center. s According to the outdoor ambient temperature T

[0043] , the temperature T a of the double U-shaped buried pipe 3, if T n -T n >y (such as y = 2 °C), where y is the lowest threshold value (determined by experiments) for the soil to effectively store the cold of outdoor air, then turn on the corresponding water pump 17 and solenoid valves 15 and 16 on the cold storage side of the double U-shaped buried pipe 3, and use the third cooling tower 4 to store the cold of the air in the soil, and calculate the instantaneous cold storage efficiency where T a is the soil temperature when the soil cold storage system starts, T n,initial is the outdoor temperature when the soil cold storage system starts, T a,initial (t) is the soil temperature at a certain moment, T n (t) is the outdoor ambient temperature at a certain moment. If η(t)>ε (such as ε = 0.2), where ε is the lowest threshold value of the instantaneous cold storage efficiency of the soil, then continue to use soil cold storage. If η(t)<ε, the soil cold storage efficiency is low, and turn off the solenoid valves 15 and 16 and the water pump 17 for soil cold storage; if T a (t) is the outdoor ambient temperature at a certain moment. If η(t)>ε (such as ε = 0.2), where ε is the lowest threshold value of the instantaneous cold storage efficiency of the soil, then continue to use soil cold storage. If η(t)<ε, the soil cold storage efficiency is low, and turn off the solenoid valves 15 and 16 and the water pump 17 for soil cold storage; if T n -T a <y (such as y = 2 °C), then the soil cold storage condition cannot be achieved, and continue to monitor the magnitude of the outdoor air temperature and the soil temperature.

[0044] If (such as T x = 18 °C, c = 0.02), then the first cooling tower 2 cannot independently provide the required cooling capacity for the data center. According to the temperature T n of the double U-shaped buried pipe 3, if T out -T n> z (for example, z = 1.5 °C), where z is the lowest threshold (determined by experiments) at which the chilled water can further obtain effective cooling capacity from the soil after being precooled by the cooling tower. Then, the soil can further cool the chilled water cooled by the first cooling tower 2. Open the corresponding water pumps 14 and solenoid valves 10, 12, 13, and close the solenoid valve 8. According to the outlet temperature T of the soil cooling side after the first cooling tower 2 and the double U-shaped buried pipe 3 jointly supply cooling f If then the first cooling tower 2 and the double U-shaped buried pipe 3 can jointly provide the required cooling capacity for the data center, entering the cooling tower precooling soil cooling mode. If T x - T f > T s (for example, T s = 2 °C), the cooling capacity provided jointly by the first cooling tower 2 and the double U-shaped buried pipe 3 is more than the cooling demand of the data center. Adjust the water pump 14 on the soil cooling side to change the flow rate m b during soil cooling, so that T x - T f < T s is satisfied. If T x - T f < T s (for example, T s = 2 °C), then the cooling capacity provided jointly by the first cooling tower 2 and the double U-shaped buried pipe 3 is adapted to the cooling demand of the data center.

[0045] If (for example, T x = 18 °C), then the joint cooling of the first cooling tower 2 and the double U-shaped buried pipe 3 cannot meet the cooling demand of the data center. Enter the cooling tower soil double-precooling water chiller cooling mode. Then open the corresponding solenoid valves 18, 20 and the water pump 21, close the solenoid valve 13, and turn on the water-cooled chiller 5 to further supplement their cooling capacity. According to the outlet water temperature T z of the evaporator in the water-cooled chiller 5, if then the three can jointly provide the required cooling capacity for the data center. If T x - T z > T s (for example, T s = 2 °C), the cooling capacity provided jointly by the three is more than the cooling demand of the data center. Adjust the frequency of the water-cooled chiller compressor to make T x - T z < T s is satisfied. If T x - T z < T s , then the cooling capacity provided jointly by the three is adapted to the cooling demand of the data center; if Adjust the compressor frequency of the water-cooled chiller to adjust the outlet water temperature of the evaporator in the water-cooled chiller.

[0046] If T out -T n <z (for example, z = 1.5 °C), then the double U-shaped buried pipe 3 cannot further cool the chilled water cooled by the first cooling tower 2, and enter the cooling mode of the cooling tower pre-cooling chiller. Open the corresponding solenoid valves 20 and 22, close the solenoid valve 8, and turn on the water-cooled chiller 5 to further supplement the cooling capacity of the first cooling tower 2. According to the outlet water temperature T z , if (for example, Tx = 18 °C, c = 0.02), then the first cooling tower 2 plus the water-cooled chiller 5 can jointly provide the required cooling capacity for the data center. If T x -T z >T s (for example, T s = 2 °C), the cooling capacity provided by the two in cooperation is more than the cooling demand of the data center. Adjust the compressor frequency of the water-cooled chiller unit to make it satisfy T x -T z <T s , if T x -T z <T s (for example, T s = 2 °C), then the cooling capacity of the combined cooling of the two is adapted to the cooling demand of the data center; if Adjust the compressor frequency of the water-cooled chiller to adjust the outlet water temperature of the evaporator in the water-cooled chiller.

[0047] According to the outdoor ambient temperature T a , the temperature T n of the double U-shaped buried pipe 3, if T a -T n <m (for example, m = 2 °C), then turn on the corresponding water pumps 25 and solenoid valves 23 and 24, and use outdoor air as the cold source of the condenser in the water-cooled chiller 5. If T n -T a >y (for example, y = 2 °C), simultaneously turn on the corresponding water pumps 17 and solenoid valves 15 and 16 on the cold storage side of the double U-shaped buried pipe 3, and use the third cooling tower 4 to make the double U-shaped buried pipe 3 store the cold in the air, and calculate the instantaneous cold storage efficiency Among them, T n,initial is the soil temperature when the soil cold storage system starts, T a,initial is the outdoor temperature when the soil cold storage system starts, T n (t) is the soil temperature at a certain moment, T a(t) is the outdoor ambient temperature at a certain moment. If η(t) > ε (for example, ε = 0.2, where ε is the lowest threshold of the instantaneous soil cooling efficiency), then continue to use soil cooling. If η(t) < ε, the soil cooling efficiency is low, and close the solenoid valve and water pump for soil cooling. If T n -T a <y (for example, y = 2 °C), then the soil cooling condition cannot be achieved, and continue to monitor the magnitudes of the outdoor air temperature and the soil temperature. If T a -T h >m (for example, m = 2 °C), then turn on the corresponding water pump 14 and solenoid valves 26 and 27, and use the soil as the cold source for the condenser in the water-cooled chiller 5.

[0048] If T2 - T a <x (for example, x = 2 °C), then the first cooling tower 2 cannot meet the cooling demand of the data center. According to the return water temperature T2 of the air-conditioning refrigeration and the temperature T n of the double U-shaped buried pipe 3, if T2 - T n >s (for example, s = 1.5 °C), where s is the lowest threshold (determined by experiments) for the soil to provide effective cooling for the data center, then the soil can cool the data center. Turn on the corresponding solenoid valves 11, 12, 13 and water pump 14. According to the outlet temperature T f of the soil during cooling, if (T x is the water supply temperature set for the air conditioner to meet the refrigeration demand of the data center, and c is the error limit set to meet the refrigeration demand (determined by experiments), then the soil can independently provide the required cooling for the data center and enter the soil independent cooling mode. If T x -T f >T s (for example, T s = 2 °C), where T s is the minimum error temperature between the water supply temperature and the set water supply temperature T x when the cold source supplies cooling, and the cooling provided by the soil is more than the cooling demand of the data center. Adjust the water pump 14 on the cooling side of the double U-shaped buried pipe 3 to change the inlet and outlet flow rate m b of the shallow buried pipe so as to satisfy T x -T f <T s ; If T x -T f <T s (for example, T s = 2 °C), then the cooling provided by the soil is adapted to the cooling demand of the data center.

[0049] If (for example, T x= 18 °C, c = 0.02), the soil cannot independently provide the required cooling capacity for the data center, and it enters the cooling mode of the soil precooling chiller. Open the corresponding solenoid valves 18, 20 and the water pump 21, close the solenoid valve 13, and start the water-cooled chiller 5 to further supplement the cooling capacity of the soil. According to the outlet temperature T of the evaporator in the water-cooled chiller 5 z If then the double U-shaped buried pipe 3 and the water-cooled chiller 5 can cooperate to provide the required cooling capacity for the data center. If T x -T z > T s (for example, T s = 2 °C), the cooling capacity provided by their cooperation is more than the cooling demand of the data center. Adjust the compressor frequency of the water-cooled chiller 5 to make it satisfy T x -T z < T s If T x -T z < T s , then the cooling capacity provided by their cooperative cooling is adapted to the cooling demand of the data center; if Adjust the compressor frequency of the chiller to adjust the outlet water temperature of the evaporator in the water-cooled chiller.

[0050] If T2 - T n < s (for example, s = 1.5 °C), the soil cannot provide effective cooling for the data center, and it enters the independent cooling mode of the chiller. Open the corresponding water pump 21 and solenoid valves 19, 20, and use the water-cooled chiller to independently provide the cooling capacity required by the data center. According to the outdoor ambient temperature T a , the temperature T of the double U-shaped buried pipe 3 n If T a -T n < m (for example, m = 2 °C), then open the corresponding water pump 25 and solenoid valves 23, 24, and use outdoor air as the cold source at the condenser end of the water-cooled chiller 5. If T n -T a > y (for example, y = 2 °C), simultaneously open the corresponding water pump 17 and solenoid valves 15, 16 on the soil cold storage side, and use the third cooling tower 4 to make the soil store the cold in the air, and calculate the instantaneous cold storage efficiency Among them, T n,initial is the soil temperature when the soil cold storage system starts, T a,initial is the outdoor temperature when the soil cold storage system starts, T n (t) is the soil temperature at a certain moment, T a(t) is the outdoor environmental temperature at a certain moment. If η(t) > ε (for example, ε = 0.2), where ε is the lowest threshold of the instantaneous soil cool storage efficiency, then continue to use soil cool storage. If η(t) < ε, the soil cool storage efficiency is low, and close the solenoid valve and water pump of the soil cool storage; if T n -T a <y. If T n -T a <y (for example, y = 2°C), then the soil cool storage condition cannot be achieved, and continue to monitor the magnitudes of the outdoor air temperature and the soil temperature; if T a -T n >m (for example, m = 2°C), then turn on the corresponding water pump 14 and solenoid valves 26, 27, and use the soil as the cold source of the condenser in the water-cooled chiller 5.

[0051] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A system for collaborative utilization of natural cold sources in a data center across time scales, characterized in that, Including: Computer room air conditioner, cooling tower, water-cooled chiller and double U-shaped ground heat exchanger; wherein the cooling tower includes a first cooling tower, a second cooling tower and a third cooling tower; The chilled water return pipe of the computer room air conditioner is divided into three paths, where the first path is connected to the first cooling tower through a water pump, the second path is connected to the water-cooled chiller, and the third path is connected to the double U-shaped ground heat exchanger through a water pump; The water outlet end of the first cooling tower is divided into three paths, where the first path returns the cooled chilled water return to the computer room air conditioner, the second path is connected to the water-cooled chiller through a water pipe, and the third path is connected to the double U-shaped ground heat exchanger through a water pipe; The water-cooled chiller includes an evaporator and a condenser. The output end of the evaporator returns the cooled chilled water return to the computer room air conditioner. The output end of the condenser is divided into two paths, where one path is connected to the second cooling tower through a water pipe, and the other path is connected to the double U-shaped ground heat exchanger through a water pipe; The output end of the double U-shaped ground heat exchanger is divided into three paths, where the first path returns the cooled chilled water return to the computer room air conditioner, the second path is connected to the third cooling tower through a water pipe, and the third path is connected to the evaporator in the water-cooled chiller through a water pipe.

2. The cross-time-scale collaborative utilization system of natural cold sources for a data center according to claim 1, characterized in that When the system is for independent cooling of the cooling tower, the chilled water return of the computer room air conditioner is transported to the first cooling tower through a water pump. The first cooling tower cools the chilled water return through the outdoor low-temperature air and then returns it to the computer room air conditioner; at the same time, when the outdoor temperature can reach the soil cold storage condition, the circulating water carrying the soil heat in the double U-shaped ground heat exchanger is transported to the third cooling tower. The third cooling tower cools it using the outdoor low-temperature air and then transports it back to the double U-shaped ground heat exchanger for soil cold storage.

3. The natural cold source cross-time-scale collaborative utilization system for a data center according to claim 1, wherein When the system is for pre-cooling the soil by the cooling tower for cooling, the chilled water return of the computer room air conditioner is transported to the first cooling tower through a water pump. The first cooling tower pre-cools it through the outdoor low-temperature air and then enters the double U-shaped ground heat exchanger to cool it again and then supply it to the computer room air conditioner.

4. The cross-time-scale collaborative utilization system of natural cold sources for a data center according to claim 1, wherein When the system is for cooling by the cooling tower with double pre-cooling of the soil and the chiller, the chilled water return of the computer room air conditioner is transported to the first cooling tower through a water pump. The first cooling tower pre-cools it through the outdoor low-temperature air, enters the double U-shaped ground heat exchanger to pre-cool it twice, then flows through the evaporator of the water-cooled chiller, and then supplies it to the computer room air conditioner; and the cooling water of the condenser in the water-cooled chiller is cooled by heat exchange with the outdoor low-temperature air through the second cooling tower.

5. The cross-time-scale collaborative utilization system of natural cold source for data center according to claim 1, wherein When the system is for cooling by the cooling tower with pre-cooling of the chiller, the chilled water return of the computer room air conditioner is transported to the first cooling tower through a water pump, and is pre-cooled through the outdoor low-temperature air, then enters the evaporator of the water-cooled chiller to supplement the required cooling capacity, and then supplies it to the computer room air conditioner; when the outdoor ambient temperature is lower than the soil temperature, the cooling water of the condenser in the water-cooled chiller is cooled by heat exchange with the outdoor low-temperature air through the second cooling tower.

6. The cross-time-scale collaborative utilization system of natural cold sources for a data center according to claim 5, characterized in that The circulating water carrying the soil heat in the double U-shaped buried pipe is transported to the third cooling tower, cooled by the outdoor low-temperature air, and then transported back to the double U-shaped buried pipe; when the outdoor ambient temperature is higher than the soil temperature, the cooling water of the condenser in the water-cooled chiller is cooled by exchanging heat with the soil through the double U-shaped buried pipe.

7. The cross-time-scale collaborative utilization system of natural cold source for data center according to claim 1, wherein When the system is for soil independent cooling, the chilled water return of the computer room air conditioner is transported to the double U-shaped buried pipe by a water pump, cooled by the soil, and then supplied to the computer room air conditioner.

8. The cross-time-scale collaborative utilization system of natural cold sources for a data center according to claim 1, wherein When the system is for soil precooling chiller cooling, the chilled water return of the computer room air conditioner is transported to the double U-shaped buried pipe by a water pump, precooled by the soil, then enters the evaporator of the water-cooled chiller, supplements the required cooling capacity, and then is supplied to the computer room air conditioner; and the cooling water of the condenser in the water-cooled chiller is cooled by exchanging heat with the outdoor low-temperature air through the second cooling tower.

9. The natural cold source cross-time-scale collaborative utilization system for a data center according to claim 1, wherein When the system is for chiller independent cooling, the chilled water return of the computer room air conditioner is transported to the evaporator of the water-cooled chiller to supplement the required cooling capacity and then supplied to the computer room air conditioner; when the outdoor ambient temperature is lower than the soil temperature, the cooling water of the condenser in the water-cooled chiller is cooled by exchanging heat with the outdoor air through the second cooling tower.

10. The cross-time-scale collaborative utilization system of natural cold sources for a data center according to claim 9, wherein The circulating water carrying the soil heat in the double U-shaped buried pipe is transported to the third cooling tower, cooled by the outdoor low-temperature air, and then transported back to the double U-shaped buried pipe to store cold through the soil; when the outdoor ambient temperature is higher than the soil temperature, the cooling water of the condenser in the water-cooled chiller is cooled by exchanging heat with the soil through the double U-shaped buried pipe.

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