Phase change cold storage tank with emergency function for data center

Abstract

The utility model discloses a phase change cold storage tank with an emergency function for a data center, which is characterized in that a vertical tank body is divided into an upper emergency area and a lower phase change cold storage area, a plurality of horizontal partition plates are arranged in the cold storage area, the horizontal partition plates positioned above the lowest horizontal partition plate are provided with liquid passing holes, the liquid passing holes of two adjacent horizontal partition plates are arranged in a staggered manner, and the liquid passing holes are communicated with the liquid passing holes. A plurality of baffling channels are formed in the tank body from bottom to top, a plurality of phase change cold storage plates are horizontally stacked on each horizontal partition plate, and a gap allowing a secondary refrigerant to circulate is formed between every two adjacent phase change cold storage plates. And a water inlet distributor and a water outlet distributor are arranged in the emergency area. The phase change cold storage tank can meet the continuous cold release requirement of the data center and meet the emergency cold release requirement at the same time, the emergency area is arranged on the upper portion of the cold storage tank, a certain amount of low-temperature water is stored in the emergency area in the operation process, and when the data center is suddenly powered off and needs emergency refrigeration, the emergency area is opened. And low-temperature water in the emergency area can be conveyed to a water cooling system of the data center in a short time.

Description

TECHNICAL FIELD

[0001] The utility model relates to cold storage equipment technical field, specifically related to a data center is with emergency function's phase change cold storage tank. BACKGROUND

[0002] As cloud computing infrastructure, data center presents accelerated growth trend in scale and quantity, thereby pulling data center IT investment scale rise, also driving data center computer room air conditioning market growth. The existing data computer room refrigeration is generally carried out through air conditioning system directly, uses air conditioning system to carry out refrigeration to data computer room, needs to guarantee air conditioning system normal work unceasingly, therefore, in the daytime power consumption peak, the large amount of power consumption of data computer room will increase the load of city power.

[0003] If water cold storage is used to continuously supply cooling for more than 4 hours, the volume is huge, the land area is big, and the water cold storage tank with only emergency function continuously supplies cooling for not more than 15 minutes. Using phase change material as cold storage medium has the advantage of high cold storage density, and efficient heat exchange is also needed for emergency cooling. In the phase change cold storage device, the large and concentrated water flow cannot fully contact and exchange heat with the phase change material, resulting in that the single phase change cold storage system as an emergency cooling scheme is difficult to meet the actual requirements. The phase change cold storage system can continuously supply cooling for more than 4 hours, but does not have the emergency function. SUMMARY

[0004] The utility model discloses a kind of phase change cold storage tanks with emergency function for data center, which can continuously supply cooling for more than 4 hours, and the volume of cold storage tank is small, with emergency function simultaneously.

[0005] The utility model discloses a kind of phase change cold storage tanks with emergency function for data center, which can continuously supply cooling for more than 4 hours, and the volume of cold storage tank is small, with emergency function simultaneously.

[0006] The upper part of the vertical tank body is an emergency area, and the lower part is a phase change cold storage area.

[0007] A plurality of horizontal partitions are arranged in the phase change cold storage area along the height direction, a liquid passing hole is arranged on each horizontal partition above the lowermost horizontal partition, the liquid passing holes of adjacent two horizontal partitions are staggered, and a plurality of zigzag channels are formed in the tank body from bottom to top.

[0008] A water inlet distributor and a water outlet distributor are arranged in the emergency area.

[0009] The water inlet distributor comprises a water inlet pipe and a water outlet distribution disc, the water inlet pipe is connected with the liquid passing hole at the top of the cold storage area, and the water outlet of the water outlet distribution disc is arranged towards the horizontal partition plate at the top of the cold storage area.

[0010] The water outlet distributor comprises a water outlet pipe and a water inlet distribution disc, the water outlet pipe is connected with the water outlet of the vertical tank body, and the water inlet of the water inlet distribution disc is arranged towards the top of the vertical tank body.

[0011] As a further optimization of the phase change cold storage tank with emergency function for a data center of the utility model, the thickness of the phase change cold storage plate on the same horizontal partition plate and the gap between adjacent phase change cold storage plates are the same, the thickness of the phase change cold storage plate on different horizontal partition plates and the gap between adjacent phase change cold storage plates have the following rules: from bottom to top, the thickness of the phase change cold storage plate gradually decreases, and the product of the number of cold storage plates and the distance between adjacent cold storage plates remains unchanged or gradually decreases.

[0012] As a further optimization of the phase change cold storage tank with emergency function for a data center of the utility model, the ratio of the thickness of the phase change cold storage plate on the same horizontal partition plate to the distance between adjacent phase change cold storage plates is k, 1≤k≤7, the value of k is different on different horizontal partition plates, and the change of the value of k has the following rules: from bottom to top, k gradually increases.

[0013] As a further optimization of the phase change cold storage tank with emergency function for a data center of the utility model, the phase change material of the phase change cold storage plate on the same horizontal partition plate is the same, the phase change material filled in the phase change cold storage plate of different horizontal partition plates is different, and the change of the phase change material has the following rules: from bottom to top, the thermal conductivity of the phase change material gradually increases.

[0014] As a further optimization of the phase change cold storage tank with emergency function for a data center of the utility model, a limiting net is arranged between adjacent horizontal partition plates, the limiting net is located at the edge of the liquid passing hole, and the phase change cold storage plate is located in the space surrounded by the limiting net.

[0015] As a further optimization of the phase change cold storage tank with emergency function for a data center of the utility model, the phase change cold storage plate located at the periphery is limited by the positioning angle steel.

[0016] As a further optimization of the phase change cold storage tank with emergency function for a data center of the utility model, the cold storage area of the vertical tank body is provided with a distributor corresponding to the water inlet.

[0017] As a further optimization of the utility model discloses a phase change cold storage tank with emergency function for data center: the phase change cold storage board includes phase change cold storage board body, phase change cold storage board body has phase change cold storage material storage cavity, one end of phase change cold storage board body is provided with loading port, the upper and lower surfaces of phase change cold storage board body are all provided with multiple mutually parallel flow guide grooves, and multiple V-shaped protrusions or arc protrusions are uniformly distributed along the length direction between adjacent two flow guide grooves and between the outermost flow guide groove and the body side edge on the surface of phase change cold storage board body.

[0018] As a further optimization of the utility model discloses a phase change cold storage tank with emergency function for data center: the top of vertical tank body is provided with exhaust valve and safety valve.

[0019] As a further optimization of the utility model discloses a phase change cold storage tank with emergency function for data center: the horizontal baffle in the lowermost layer is grating plate, and the bottom of vertical tank body is provided with drain valve.

[0020] The utility model has the following beneficial effects:

[0021] One, the phase change cold storage tank of the utility model utilizes the cooling water generated by water chiller to store cold in the electricity low valley, and in the daytime (electricity peak), the phase change cold storage tank is used to cool the data room, realizes the electricity "peak load shifting", improves the use ratio of electricity in the electricity low valley section, and reduces the electricity cost.

[0022] Two, the phase change cold storage tank of the utility model can meet the emergency cooling demand of data center, is provided with emergency area in the upper portion of phase change cold storage tank, and when running, the emergency area stores a certain amount of low-temperature water, when the data center needs emergency cooling due to power failure, the water first passes through phase change cold storage area, then enters emergency area, and the low-temperature water in emergency area is transported to the water cooling system of data center in a short time, to ensure the safe operation of data center. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is whole structure schematic diagram of phase change cold storage tank;

[0024] Figure 2 It is layout schematic diagram (form one) of phase change cold storage board on horizontal baffle;

[0025] Figure 3 It is layout schematic diagram (form two) of phase change cold storage board on horizontal baffle;

[0026] Figure 4 It is whole structure schematic diagram (form one) of phase change cold storage board;

[0027] Figure 5 It is assembly state schematic diagram (form one) of phase change cold storage board;

[0028] Figure 6 Overall structure of phase change cold storage plate (form two);

[0029] Figure 7 Structure of V-shaped protrusion and V-shaped groove of phase change cold storage plate (form two);

[0030] Figure 8 Assembled state of phase change cold storage plate (form two);

[0031] Figure 9 Overall structure of phase change cold storage plate (form three);

[0032] Figure 10 Structure of first protrusion and second protrusion of phase change cold storage plate (form three);

[0033] Figure 11 Assembled state of phase change cold storage plate (form three);

[0034] Figure 12 Overall structure of phase change cold storage plate (with avoidance groove);

[0035] Markings in the figure:

[0036] 1. Phase change cold storage plate;

[0037] 2. Flow guide groove;

[0038] 3. V-shaped protrusion;

[0039] 4. V-shaped groove;

[0040] 5. First protrusion;

[0041] 6. Second protrusion;

[0042] 7. Avoidance groove;

[0043] 8. Tank body;

[0044] 801. Emergency area;

[0045] 802. Phase change cold storage area;

[0046] 9. Horizontal partition;

[0047] 10. Water inlet distributor;

[0048] 11. Water outlet distributor;

[0049] 12. Limiting net;

[0050] 13. Positioning angle steel. DETAILED DESCRIPTION

[0051] To better understand this utility model, the following embodiments further illustrate the content of this utility model, but the content of this utility model is not limited to the following embodiments.

[0052] like Figures 1-3 As shown: A phase change cold storage tank for data centers with emergency functions includes a vertical tank body 8. The tank body 8 is a conventional vertical tank body, and the refrigerant (water) flows from bottom to top inside the tank body 8. The interior of the vertical tank body 8 is divided into an upper emergency zone 801 and a lower phase change cold storage zone 802. A water inlet is provided on the side wall of the vertical tank body 8 corresponding to the cold storage zone 802, and a water outlet is provided on the side wall corresponding to the emergency zone 801.

[0053] Multiple horizontal baffles 9 are arranged along the height direction in the lower phase change cold storage zone 802. Each horizontal baffle 9 above the lowest horizontal baffle 9 is provided with a liquid passage hole 12. The liquid passage holes of two adjacent horizontal baffles 9 are staggered. Multiple baffle channels are formed inside the tank body 8 from bottom to top. Multiple phase change cold storage plates 1 are horizontally stacked on each horizontal baffle 9. There are gaps between adjacent phase change cold storage plates 1 for the flow of refrigerant.

[0054] The top of the vertical tank 8 is equipped with an exhaust valve and a safety valve, the bottom horizontal partition 9 is a grating plate, and the bottom of the vertical tank 8 is equipped with a drain valve.

[0055] Since the phase change cold storage plates 1 are stacked on the horizontal partitions 9, to prevent the phase change cold storage plates 1 from shifting, a limiting net 12 can be set between adjacent horizontal partitions 9. The limiting net 12 is set at the edge of the liquid passage, and the phase change cold storage plates 1 are all located within the space enclosed by the limiting net 12. Of course, the phase change cold storage plates 1 can also be prevented from shifting by setting positioning angle steel 13 around the periphery of the phase change cold storage plates 1.

[0056] Emergency zone 801 is equipped with an inlet water distributor 10 and an outlet water distributor 11. The inlet water distributor 10 includes an inlet water pipe and an outlet water distribution plate. The inlet water pipe is connected to the liquid passage hole at the top of the lower phase change cold storage zone 802. The outlet water distribution plate is positioned with its outlet facing the horizontal partition 9 at the top of the lower phase change cold storage zone 802. The outlet water distributor 11 includes an outlet water pipe and an inlet water distribution plate. The outlet water pipe is connected to the outlet of the vertical tank 8. The inlet water distribution plate is positioned with its inlet facing the top of the vertical tank 8.

[0057] Water entering from the bottom of tank 8 passes through the lower phase change cold storage zone 802 and then enters the inlet pipe of water distributor 10 through the liquid passage hole of the top horizontal partition 9. Finally, it enters the emergency zone 801 of tank 8 through the outlet distribution plate. The outlet distribution plate is a disc shape that is suitable for the inner diameter of tank 8. Small water outlet holes are evenly distributed on the distribution plate. The water distributor 10 ensures that the water in the emergency zone 801 can be evenly discharged, avoiding the occurrence of "short circuit".

[0058] The thickness of the phase change cold storage plate 1 on the same horizontal partition plate 9 and the gap between adjacent phase change cold storage plates 1 are the same, and the thickness of the phase change cold storage plate 1 on different horizontal partition plates 9 and the gap between adjacent phase change cold storage plates 1 have the following rules: from bottom to top, the thickness of the phase change cold storage plate 1 gradually decreases, and the product of the number of cold storage plates 1 and the distance between adjacent cold storage plates 1 remains unchanged or gradually decreases.

[0059] The specifications of the phase change cold storage plates 1 on the same horizontal partition plate 9 are the same, and the phase change materials filled in them are also the same. It can be foreseen that, since the thickness of the phase change cold storage plate 1 gradually decreases along the direction of the flow of the cold carrier, the number of phase change cold storage plates 1 on the horizontal partition plate 9 also tends to increase along the direction of the flow of the cold carrier.

[0060] The ratio of the thickness of the phase change cold storage plate 1 to the distance between adjacent phase change cold storage plates 1 on the same horizontal partition plate 9 is k, 1≤k≤7, and the value of k is different for different cold storage assemblies. The value of k changes as follows: along the direction of the flow of the cold carrier, k gradually increases.

[0061] The phase change materials filled in the phase change cold storage plates 1 on the same horizontal partition plate 9 are the same, and the phase change materials filled in the phase change cold storage plates 1 of different cold storage assemblies are different. The thermal conductivity of the phase change material gradually increases along the direction of the flow of the cold carrier.

[0062] Water can be used as the cold carrier. Water has a high specific heat capacity and can absorb or release a large amount of heat while its temperature changes relatively little, which enables it to effectively store and transfer cold during the cold storage and release processes. Moreover, water has stable chemical properties and will not undergo chemical reactions under normal cold storage and release conditions, thus not causing corrosion and other adverse effects on the cold storage equipment and the cooled objects.

[0063] Along the direction of the flow of the cold carrier, the thickness of the phase change cold storage plate 1 gradually decreases, and the product of the number of cold storage plates 1 and the distance between adjacent cold storage plates 1 remains unchanged or gradually decreases, so that the flow rates of the cold carrier before and after are consistent or the flow rate after is higher, which ensures that the completion time of the charging and cooling is consistent, avoiding the situation that the phase change cold storage plate 1 in front completes the phase change while the phase change cold storage plate 1 behind does not, resulting in a longer charging and cooling time for the entire heat exchanger.

[0064] The phase change cold storage plate 1 comprises a phase change cold storage plate body, the phase change cold storage plate body has a phase change cold storage material storage cavity, one end of the phase change cold storage plate body is provided with a loading port, and the upper and lower surfaces of the phase change cold storage plate body are both provided with a plurality of mutually parallel flow guide grooves 2. A plurality of V-shaped protrusions 3 or arc-shaped protrusions are uniformly distributed along the length direction between adjacent two flow guide grooves 2 and between the outermost flow guide groove 2 and the side edge of the body surface.

[0065] The loading port of the phase change cold storage plate body is equipped with a loading nozzle and a cap, mainly to facilitate the filling of phase change material into the phase change cold storage plate 1. There are at least two ways to set the loading nozzle:

[0066] The loading port of the phase change cold storage plate body is located within a recess, and the loading nozzle is conveniently hidden within this recess. The overall shape of the phase change cold storage plate body is relatively regular, but this type of loading nozzle cannot completely fill the interior of the phase change cold storage plate body. Some organic phase change materials are liquid at room temperature, but they solidify into a solid state when the temperature drops below their melting point. The volume of organic phase change materials shrinks during solidification because their molecules are relatively loosely arranged in the liquid state, while they are more densely arranged in the solid state. Even if the material is filled completely, the phase change cold storage plate 1 will not deform during the phase change process.

[0067] Another form is: the loading port of the phase change cold storage plate body is provided with a threaded loading nozzle, and a cap is screwed onto the loading nozzle. The end of the phase change cold storage plate body opposite to the loading nozzle is provided with a clearance groove that is suitable for the shape of the loading nozzle. The clearance groove is provided so that when multiple phase change cold storage plates 1 are connected, the loading nozzles of adjacent phase change cold storage plates 1 can be placed in the clearance groove.

[0068] The phase change material filled in the cold storage plate can be a hydrated salt phase change material, which mainly achieves cold storage through its solid-liquid phase change at a specific temperature. During the cold storage process, when the ambient temperature is lower than the phase change temperature of the hydrated salt, the hydrated salt changes from a liquid to a solid state, releasing the latent heat of phase change, thus achieving cold storage. During the cold release process, when the ambient temperature is higher than the phase change temperature of the hydrated salt, the hydrated salt changes from a solid to a liquid state, absorbing heat from the surroundings, thus achieving cold release.

[0069] There are three specific forms of phase change cold storage plates:

[0070] Form 1: such as Figures 4-5 As shown, the material of the phase change heat storage plate body can usually be plastic, such as HDPE and PE. Plastic materials are widely used in the manufacture of phase change heat storage plates due to their good plasticity, durability, and cost-effectiveness. HDPE (high-density polyethylene) and PE (polyethylene) are not only safe and non-toxic, but also have good cold insulation properties and reusability.

[0071] The upper and lower surfaces of the phase change cold storage plate body are provided with multiple parallel guide grooves 2, and the cross-section of the guide grooves 2 is an inverted trapezoid. Multiple V-shaped protrusions 3 are evenly distributed along the length of the surface of the phase change cold storage plate body between two adjacent guide grooves 2 and between the outermost guide groove 2 and the side of the body body.

[0072] The protruding openings on the upper and lower surfaces of the phase change cold storage plate body face opposite directions. The upper and lower surfaces of the phase change cold storage plate body are also provided with end grooves, the cross sections of the end grooves are V-shaped. One end of the end groove is communicated to the end surface of the phase change cold storage plate body, and the other end extends into the interval of the flow guide groove 2.

[0073] Through the unique surface structure design described above, the degree of turbulence of the heat transfer medium on the surface of the phase change cold storage plate body can be improved, thereby improving the heat transfer efficiency, and the phase change cold storage plate 1 has strong external pressure bearing capacity and the sealing port does not leak.

[0074] Form two: as shown in Figures 6-8 The difference between the two forms is that a V-shaped groove 4 is arranged between two adjacent protrusions in the same column, and the direction of the V-shaped groove 4 or the arc-shaped groove is consistent with the V-shaped protrusion 3.

[0075] Form three: as shown in Figures 9-11 The difference between the two forms is that the heights of the protrusions in the same column are inconsistent.

[0076] The protrusions in the same column include first protrusions 5 with a height of h1 and second protrusions 6 with a height of h2, h1>h2, and the protrusions in the same column are arranged in a regular pattern of "first protrusion 5, second protrusion 6, second protrusion 6, first protrusion 5, second protrusion 6, second protrusion 6, first protrusion 5……".

[0077] The phase change cold storage plate utilizes its special design and the phase change materials filled therein to effectively capture the cold energy carried by the cooling water generated by the water chiller. These phase change materials have specific thermodynamic properties and can undergo phase change at low temperature, such as from liquid to solid or from one crystal state to another, during which a large amount of latent heat is absorbed, thereby realizing the storage of cold energy.

[0078] When the day comes, the peak power consumption period appears, and a large number of heat-generating electronic components such as servers and storage devices in the data center require stable low-temperature environment to ensure their normal operation. At this time, the phase change cold storage tank begins to release cold energy. Through a reasonably arranged heat exchange system, the reverse phase change process occurs in the cold storage tank, and the stored cold energy is transferred to the refrigerant, which is then evenly distributed to each area of the data center through a precisely designed pipeline network, thereby effectively reducing the temperature of the data center and meeting the cooling demand of the data center.

[0079] This working mode effectively realizes the "peak load shifting" of power. During the peak period of electricity consumption, the release of cold by the phase change cold storage tank for data center refrigeration significantly reduces the amount of electricity obtained from the power grid for refrigeration in the data center, and relieves the power supply pressure of the power grid during the peak period. At the same time, during the valley period of electricity consumption, the process of the water chiller for the cold storage of the cold storage tank increases the electricity load during the valley period, improves the electricity utilization rate of the power system during the valley period, and makes the power resources more reasonably distributed and utilized in the time dimension, which is of great significance for optimizing the operation efficiency and economy of the power system.

[0080] The emergency refrigeration working condition of the data center is usually due to the occurrence of the following situations:

[0081] Chiller failure: In the water cooling system of the data center, the chiller is the core refrigeration equipment. If the chiller suddenly fails, for example, the compressor is damaged, the refrigerant leaks, etc., its refrigeration function will be immediately lost. At this time, the servers and other equipment in the data center are still running and continuously generating heat, and the environmental temperature will rise rapidly. The emergency cold release demand is to provide sufficient cold quickly to prevent the temperature of the computer room from being too high and to ensure that the equipment can still operate normally in a short time to gain time for repairing the chiller.

[0082] Water pump failure: The water pump is responsible for the circulation of the cooling liquid in the water cooling system. If the water pump fails, the cooling liquid cannot circulate normally, and the cold cannot be effectively transferred to the equipment that needs to be cooled. This will cause local overheating, and the emergency cold release system needs to make up for the missing cold at this time to prevent the equipment from being damaged due to overheating.

[0083] Emergency power interruption: When the data center encounters a power interruption, the normal water cooling system will stop working. However, the key equipment such as servers in the data center usually has an uninterruptible power supply (UPS) to maintain short-time operation. During this period, the emergency cold release system needs to provide cold, because the equipment is still generating heat. Especially for some high-performance servers that are extremely sensitive to temperature changes, even a short period of temperature rise can cause data loss or hardware damage, so the emergency cold release demand is particularly important.

[0084] The phase change cold storage tank of the utility model can meet the emergency cold release demand of the data center, and an emergency area is arranged at the upper part of the cold storage tank. During operation, the emergency area stores a certain amount of low-temperature water, and when the data center suddenly loses power and needs emergency refrigeration, the low-temperature water in the emergency area can be delivered to the water cooling system of the data center in a short time.

[0085] Meanwhile, the phase change cold storage tank is specially designed for the thickness of the phase change cold storage plate and the plate spacing, the plate thickness of the phase change cold storage plate gradually thins along the flow direction of the cold carrier, meanwhile the plate spacing is unchanged or becomes smaller, so that the total flow cross-sectional area in the flow direction of the cold carrier is unchanged or gradually becomes smaller, the flow rates of the front and rear are consistent or the flow rate of the rear is higher, so that the time of completing the cold charging can be guaranteed to be consistent, and the phase change of the front phase change cold storage plate is completed, and the phase change of the rear phase change cold storage plate is not completed, so that the cold charging time of the whole heat exchanger is longer.

[0086] The specific embodiments of the utility model are described above. It needs to be understood that the utility model is not limited to the above specific implementation manners, and various modifications or changes can be made by those skilled in the art within the scope of claims, which does not affect the essential content of the utility model.

Claims

1. A phase change cold storage tank with emergency function for data center, comprising a vertical tank body (8), characterized in that: the vertical tank body (8) is internally divided into an upper emergency area (801) and a lower phase change cold storage area (802), the side wall of the vertical tank body (8) is provided with a water inlet corresponding to the phase change cold storage area (802), and the side wall is provided with a water outlet corresponding to the emergency area (801); a plurality of horizontal partitions (9) are arranged in the phase change cold storage area (802) along the height direction thereof, the horizontal partitions (9) above the lowermost horizontal partition (9) are each provided with a liquid passing hole (12), the liquid passing holes of adjacent two horizontal partitions (9) are staggered, the inside of the tank body (8) forms a plurality of baffle passages from bottom to top, and a plurality of phase change cold storage plates (1) are horizontally stacked on each horizontal partition (9), and there is a gap between adjacent phase change cold storage plates (1) for the flow of cold carrier. The emergency area (801) is provided with a water inlet distributor (10) and a water outlet distributor (11); The water inlet distributor (10) comprises a water inlet pipe and a water outlet distribution disc, the water inlet pipe is connected with the liquid passing hole at the top of the phase change cold storage area (802), and the water outlet of the water outlet distribution disc is arranged towards the horizontal partition (9) at the top of the phase change cold storage area (802); The water outlet distributor (11) comprises a water outlet pipe and a water inlet distribution disc, the water outlet pipe is connected with the water outlet of the vertical tank body (8), and the water inlet of the water inlet distribution disc is arranged towards the top of the vertical tank body (8). The thickness of the phase change cold storage plates (1) on the same horizontal partition (9) and the gap between adjacent phase change cold storage plates (1) are the same, the thickness of the phase change cold storage plates (1) on different horizontal partitions (9) and the gap between adjacent phase change cold storage plates (1) have the following rules: from bottom to top, the thickness of the phase change cold storage plates (1) gradually decreases, and the product of the number of cold storage plates (1) and the distance between adjacent cold storage plates (1) remains unchanged or gradually decreases. The ratio of the thickness of the phase change cold storage plates (1) on the same horizontal partition (9) to the distance between adjacent phase change cold storage plates (1) is k, 1≤k≤7, the value of k is different on different horizontal partitions (9), and the value of k changes as follows: from bottom to top, k gradually increases.

2. The phase change cold storage tank with emergency function for data center according to claim 1, characterized in that: The phase change materials of the phase change cold storage plates (1) on the same horizontal partition (9) are the same, the phase change materials filled in the phase change cold storage plates (1) on different horizontal partitions (9) are different, and the phase change materials change as follows: from bottom to top, the thermal conductivity of the phase change materials gradually increases.

3. The phase change cold storage tank with emergency function for data center of claim 1, wherein: A limiting net (12) is arranged between adjacent horizontal partitions (9), the limiting net (12) is located at the edge of the liquid passing hole, and the phase change cold storage plates (1) are located in the space surrounded by the limiting net (12).

4. The phase change cold storage tank with emergency function for data center of claim 1, wherein: The phase change cold storage plates (1) located at the periphery are limited by positioning angle steels (13).

5. The phase change cold storage tank with emergency function for data center of claim 1, wherein: The phase change cold storage area (802) of the vertical tank body (8) is provided with a distributor corresponding to the water inlet.

6. The phase change cold storage tank with emergency function for data center of claim 1, wherein: ​ 7. The phase change cold storage tank with emergency function for data center of claim 1, wherein: ​ 8. The phase change cold storage tank with emergency function for data center of claim 1, wherein: The phase change cold storage plate (1) comprises a phase change cold storage plate body having a phase change cold storage material storage cavity, one end of the phase change cold storage plate body is provided with a loading port, and the upper and lower surfaces of the phase change cold storage plate body are provided with a plurality of mutually parallel flow guide grooves 2; a plurality of V-shaped protrusions 3 or arc-shaped protrusions are arranged on the surface of the phase change cold storage plate body between adjacent two flow guide grooves 2 and between the outermost flow guide grooves 2 and the side edges of the body along the length direction.

9. The phase change cold storage tank with emergency function for data center of claim 1, wherein: The top of the vertical tank body (8) is provided with an exhaust valve and a safety valve.

10. The phase change cold storage tank with emergency function for data center of claim 1, wherein: The horizontal partition plate (9) located at the lowermost layer is a grating plate, and the bottom of the vertical tank body (8) is provided with a drain valve.

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