CN110345791A - Phase-change accumulation energy can system and data center platform suitable for data center - Google Patents

Abstract

The invention relates to the technical field of phase change energy storage, and provides a phase change energy storage tank system suitable for data centers. The outer surface of the heat storage tank (300) is provided with a microchannel heat exchanger (400), which can transfer the waste heat of the data center to the phase change material (500) for storage; the phase change material inside the heat storage tank (300) ( 500) exchanges heat with the working medium passing through the spiral coil (200) to realize heat release, and serves as a high-quality heat source for heating and hot water; the storage and release of heat is flexible and convenient, and is not limited by time. The invention reduces the waste of waste heat in the data center, realizes heat recovery and utilization, can realize automation, and is convenient for popularization and application.

Description

Phase change energy storage tank system and data center platform suitable for data centers

technical field

The invention relates to the technical field of phase change energy storage, in particular to a phase change energy storage system for data center waste heat recovery.

Background technique

A data center is a building site that gathers a large number of computing equipment, storage equipment, network equipment and other equipment. It is an infrastructure and service platform for centralized processing, storage, transmission, exchange, and management of data information. In recent years, data centers have gradually developed towards large-scale and high-density development, and the machinery and equipment in the computer room are operating 24 hours a day, which also makes their heat generation continue to increase. At present, the full-load heat dissipation density of high-end single-chip CPU is as high as 75W/cm2, the power of a single 1U server can reach 400W, and the floor area of a standard rack is only 0.48m2, but its power is as high as 4KW. The heat is as high as 20-30KW. If these energies can be recovered and utilized, the effects of energy saving and reduction of greenhouse gas emissions will be achieved. However, how to recover and utilize the waste heat in the data center is a technical problem that needs to be solved urgently.

In the phase change energy storage system, the phase change energy storage heat exchanger is the most important component. Generally speaking, a phase change energy storage heat exchanger is mainly composed of a heat storage tank, a heat exchanger, and a phase change material. Among them, the heat storage tank is mainly used to store the phase change material and avoid heat loss, the heat exchanger is used for the heat exchange process between the heat transfer fluid and the phase change material, and the phase change material acts as a heat storage carrier role. However, for the application scenario of high heat dissipation density in the data center, it is required that the phase change energy storage heat exchanger has good heat transfer performance and can store heat in the phase change material in time, which requires various The technical means solve the problem of low heat exchange efficiency of the phase change energy storage heat exchanger. For example, in the data center heat recovery system disclosed in the patent document CN208779540U, different modes of heat recovery can be switched. Energy recovery is limited by time, and energy storage cannot be realized. The recovery valve can only be activated when the user needs it. The present invention realizes high-efficiency energy storage through comprehensive utilization of heat exchangers, and achieves the effect of saving energy.

Contents of the invention

In view of the defects in the prior art, the object of the present invention is to provide a phase change energy storage tank system and a data center platform suitable for data centers.

According to the present invention, a phase change energy storage tank system suitable for data centers is provided, including a top cover 100, a spiral coil 200, a heat storage tank body 300, a microchannel heat exchanger 400, and a phase change material 500;

The top cover 100 and the heat storage tank body 300 are installed together, and the phase change material 500 is contained in the accommodation space 800 surrounded by the heat storage tank body 300 and the top cover 100;

The spiral coil 200 is installed inside the heat storage tank 300 and submerged in the phase change material 500;

The spiral coil 200 extends to the outside of the accommodation space 800 to form a fluid inlet 201 and a fluid outlet 202;

The microchannel heat exchanger 400 is closely attached to the outside of the heat storage tank 300 .

Preferably, the fluid inlet 201 and the fluid outlet 202 pass through the tank wall of the heat storage tank 300 and protrude from the outer surface of the heat storage tank 300;

The inner wall of the spiral coil 200 has an internal thread 210;

The number of spiral coil tubes 200 is one or more;

The heat exchange working medium in the spiral coil tube (200) is liquid or gaseous.

Preferably, the heat storage tank 300 is a cylindrical tank;

The material of the heat storage tank body 300 is corrosion-resistant;

No chemical reaction occurs between the heat storage tank body 300 and the phase change material 500 .

Preferably, the microchannel heat exchanger 400 is mainly composed of a plurality of microchannel flat tubes 403 connected in parallel;

Each microchannel flat tube 403 of the microchannel heat exchanger 400 is closely attached to the outside of the heat storage tank 300;

The microchannel heat exchanger 400 is filled with gas-liquid phase working medium;

The microchannel 405 in the microchannel flat tube 403 has toothed fins 404;

The circumferential outer side of the heat storage tank body 300 and the outer side of the top cover 100 are entirely covered with an insulating material 600 .

Preferably, the microchannel heat exchanger 400 includes a condensation end 401 and an evaporation end 402;

Along the heat flow direction of the microchannel heat exchanger, the evaporating end 402 is located upstream, and the condensing end 401 is located downstream; the evaporating end 402 is tightly and sealed connected with the condensing end 401 through the heat exchanger pipe 021 .

Preferably, the phase change material 500 is a solid-liquid phase change material. Preferably, the fluid 700 enters the spiral coil 200 from the fluid inlet 201;

The fluid 700 and the phase change material 500 exchange heat through the spiral coil 200;

When the phase change material 500 reaches the phase change temperature, the phase change material changes from liquid to solid to realize heat release; the phase change material (500) is a solid-liquid phase change material. Preferably, the evaporating end 402 transfers the heat of the data center to the condensing end 401;

The condensation end 401 exchanges heat with the phase change material 500 through the heat storage tank 300;

When the phase change material 500 reaches the phase change temperature, the phase change material changes from solid to liquid to realize heat storage.

A data center platform provided according to the present invention includes: a data center, and also includes the phase change energy storage tank system applicable to the data center;

The phase change energy storage tank system suitable for data centers can collect and store the waste heat of the data center, and can release the collected and stored heat as a heat source.

Preferably, the data center platform further includes a control system 900,

Under the control of the control system 900, intelligent control can be realized according to the temperature of the data center and the shape of the phase change material 500, including:

When the phase-change material 500 is solid, the control system 900 can automatically start, and transfer the waste heat of the data center to the phase-change material 500 through the microchannel heat exchanger 400 for storage;

When the phase change material 500 is in liquid phase, the control system 900 can be automatically activated to make the fluid 700 flow from the fluid inlet 201 into the spiral coil 200 , so as to release the heat stored in the phase change material 500 .

The present invention has following beneficial effect:

1. The heat storage and use of the present invention are flexible and convenient, and are not limited by time;

2. The present invention has the advantages of high heat storage, and the process of energy storage and energy release is in a stable temperature range;

3. The present invention has a high degree of automation and saves labor costs.

Description of drawings

Other characteristics, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

FIG. 1 is a schematic diagram of a three-dimensional model of a heat storage tank body 300;

FIG. 2 is a schematic diagram of the assembly of the heat storage tank body 300;

3 is a schematic diagram of the internal structure of the microchannel heat exchanger 400;

4 is a schematic cross-sectional view of the spiral coil 200;

FIG. 5 is a schematic diagram of the heat supply process of the heat storage tank body 300 to the user.

The figure shows:

Detailed ways

The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

As shown in Fig. 1, Fig. 2, Fig. 3 and Fig. 4, a phase change energy storage tank system suitable for data centers provided according to the present invention includes a top cover 100, a spiral coil 200, a heat storage tank body 300, Microchannel heat exchanger 400 , phase change material 500 , insulation material 600 , fluid 700 , accommodation space 800 , and data center 900 .

The top cover 100 and the heat storage tank body 300 are installed and tightly connected, and the phase change material 500 is contained in the storage space 800 surrounded by the heat storage tank body 300 and the top cover 100; when the phase change material 500 absorbs or releases heat, it The volume will change. At this time, the air in the upper part of the storage space 800 will be discharged or filled into the storage space 800 through the gap between the top cover 100 and the heat storage tank body 300, so that the internal and external pressure of the heat storage tank body 300 is balanced; the heat storage tank body 300 and the outer side of the top cover 100 are covered with thermal insulation material 600 as a whole.

The spiral coil 200 is installed inside the heat storage tank 300 and submerged in the phase change material 500; the inner wall of the spiral coil 200 has an internal thread 210, which increases the heat exchange area between the fluid 700 and the phase change material 500, and improves the heat exchange rate. Thermal efficiency. The number of spiral coils 200 is one or more, the more the number of spiral coils 200 of the same specification, the higher the heat exchange efficiency; the thicker the diameter of the same number of spiral coils 200, the more turns, the higher the heat exchange efficiency high. The larger the number of the spiral coil tubes 200, the less the phase change material 500 will be, and the heat storage capacity of the phase change material 500 will decrease.

The heat storage tank 300 is a cylindrical tank; the material of the heat storage tank 300 is corrosion-resistant, or the material of the heat storage tank 300 is not corrosion-resistant, but the heat storage tank 300 has been treated with anticorrosion; No chemical reaction occurs between 300 and phase change material 500 .

The phase change material 500 is a solid-liquid phase change material; the fluid 700 enters the spiral coil 200 from the fluid inlet 201, and the fluid 700 and the phase change material 500 perform heat exchange through the spiral coil 200, and the phase change material 500 reaches the phase change temperature At this time, the phase change material changes from liquid to solid, realizing the release of heat.

Specifically, the spiral coil 200 extends to the outside of the accommodation space 800 to form a fluid inlet 201 and a fluid outlet 202; the fluid inlet 201 and the fluid outlet 202 pass through the tank wall of the heat storage tank 300 and extend out of the heat storage tank. The outer surface of 300; the fluid outlet 202 transports the hot fluid to the user through the pipeline, and the hot fluid becomes cold fluid after the user uses it, and the cold fluid is sent back to the fluid inlet 201; the fluid delivery pipeline is provided with power equipment, such as Pipeline pumps, the start and stop of pipeline pumps are controlled by the control system 900, and interlocking is set; wherein, in a variation example, as shown in Figure 5, an inlet temperature sensor 002 is installed at the fluid inlet 201, and a temperature sensor 002 is installed at the fluid outlet 202 The outlet regulating valve 003, the outlet temperature sensor 001, the switching status of the outlet regulating valve 003, the inlet temperature 012 monitored by the inlet temperature sensor 002, and the outlet temperature 011 monitored by the outlet temperature sensor 001 are all displayed in the control system 900, and are controlled by the control system 900. The system 900 remotely controls the opening of the outlet regulating valve 003 (0-100%). At the same time, in the control system 900, the outlet temperature 011 and the inlet temperature 012 can be set according to user needs to perform chain control with the regulating valve 003 to realize automatic adjustment; In a variation example, three heat storage tanks 300 are connected, and the control system 900 can automatically switch according to the heat storage conditions of the heat storage tanks 300 to realize continuous supply of heat to users.

Specifically, the microchannel heat exchanger 400 is closely attached to the outside of the heat storage tank body 300. The microchannel heat exchanger 400 is mainly composed of a plurality of microchannel flat tubes 403 connected in parallel, and each microchannel flat tube 403 is tightly connected. Attached to the outside of the heat storage tank 300; the microchannel 405 in the microchannel flat tube 403 has tooth-shaped fins 404, and the microchannel technology can effectively improve the heat exchange efficiency of the heat exchanger by constructing micro-scale fluid channels. The working medium in the microchannel flat tube 403 is a gas-liquid phase change working medium; at the same time, the microchannel heat exchanger 400 includes a condensation end 401 and an evaporation end 402; the evaporation end 402 is fastened to the condensation end 401 through the heat exchanger pipe 021 Sealed connection, the heat exchanger pipe 021 connecting the evaporating end 402 and the condensing end is provided with insulation material; along the heat flow direction of the microchannel heat exchanger, the evaporating end 402 is located upstream, and the condensing end 401 is located downstream. The microchannel heat exchanger 400 uses the principle of heat pipe technology to transfer heat from the evaporating end 402 to the condensing end 401; the evaporating end 402 is integrated with the IT equipment in the data center, or other facilities that are conducive to heat transfer under the premise of ensuring electricity safety The connection method, such as the evaporation end is closely attached to the IT equipment in the data center.

After the evaporating end 402 absorbs the heat of the data center, the internal working medium changes from a liquid phase to a gas phase, and the heat carried by the working medium after gasification is transferred to the condensing end 401, and the gas phase working medium in the condensing end 401 reaches the condensation temperature and changes from a gas phase to a liquid phase At the same time, the heat is transferred to the phase change material 500 through the heat storage tank 300 for storage, and when the phase change material 500 reaches the phase change temperature, it changes from solid to liquid to realize heat storage; the working medium in the microchannel heat exchanger 400 The condensation temperature is close to the phase change temperature of the phase change material 500, for example, the condensation temperature of the working fluid in the microchannel heat exchanger 400 is 50°C, and the phase change temperature of the phase change material 500 is 49°C.

A data center platform provided according to the present invention includes: a data center, and also includes the phase-change energy storage tank system suitable for a data center, which can collect and store waste heat in a data center, and can store the collected and stored heat Released as a heat source.

Specifically, the data center platform also includes a control system 900. Under the control of the control system 900, intelligent control can be realized according to the temperature of the data center and the form of the phase change material 500, including: when the phase change material 500 is in a solid state , the control system 900 can start automatically, and transfer the waste heat of the data center to the phase change material 500 for storage through the microchannel heat exchanger 400; One or more sets of heat can be set; for example, three sets of phase change energy storage tank systems suitable for data centers can be set, and the heat exchanger regulating valve 004 can be set in the heat exchanger pipe 021 and connected to the control system 900, through the phase change The temperature of the material 500 can be used to determine which system needs to store heat, so as to open the regulating valve leading to that system, and the temperature of the phase change material and the heat exchanger regulating valve 004 can also be set as chain control to realize automatic regulation. When the phase change material 500 is in liquid phase, the control system 900 can be automatically activated to make the fluid 700 flow from the fluid inlet 201 into the spiral coil 200 , so as to release the heat stored in the phase change material 500 .

In the embodiment, the phase change material 500 is a paraffin-expanded graphite composite phase change material, the phase change temperature is 40°C, the latent heat of phase change is 181670J/Kg, the density is 806.593Kg/m3, and the thermal conductivity is 2.4W/(m*K ), the specific heat is 2183J/(kg*K). The phase change material 500 fills 85% of the volume of the entire tank.

In the embodiment, the heat storage tank 300 has a radius of 0.2m and a height of 1.8m, the diameter of the spiral coil 200 is 0.025m, the radius of rotation is 0.175m, the number of turns is 18, and the total height is 1.65m. The heat transfer fluid flows in from the fluid inlet 201 of the heat storage tank body 300 , and flows out from the fluid outlet 202 after heat exchange.

In the embodiment, the microchannel heat exchanger 400 has a height of 2mm and a width of 2.6mm. The internal toothed ribs have a width of 0.6 mm, a height of 0.5 mm, and an interval of 0.2 mm. In a variant, the interval may also be 0.3. There are three upper and lower toothed ribs, symmetrically distributed.

In the embodiment, the total heat storage capacity of the heat storage tank 300 is about 21.2MJ. During the heat storage process, the temperature at the condensation end of the microchannel heat exchanger 400 can reach 50°C, and the heat transfer efficiency can reach up to 74.11%. During the heat release process, when the air at 23°C flows into the heat storage tank 300 at a rate of 0.034m/s, the outlet temperature can reach 37.2°C.

It can be seen from the above technical solutions that the present invention is a high-efficiency phase-change energy storage tank, and the heat transfer performance of the phase-change energy storage tank system suitable for data centers has been multi-faceted according to the characteristic of high heat flux in the data center strengthen. Compared with the traditional energy storage tank, the high-efficiency phase change energy storage tank in the present invention has large storage energy, fast energy storage speed and high energy utilization rate; at the same time, according to the actual heat dissipation and energy storage requirements, it is convenient to improve the internal Structural parameters or combine multiple tanks to meet different usage requirements.

Applying phase change energy storage to data centers can effectively recover a large amount of waste heat emitted by data centers, and then use it as a high-quality heat source for heating, hot water, etc. This not only reduces the data center heat load, but also improves energy efficiency, which serves multiple purposes.

In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", The orientation or positional relationship indicated by "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, rather than indicating or implying the referred device Or elements must have a certain orientation, be constructed and operate in a certain orientation, and thus should not be construed as limiting the application.

The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make many modifications and changes according to the concept of the present invention without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the scope of protection defined by the claims. In the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims (9)

1. A phase change energy storage tank system suitable for data centers, characterized in that it includes a top cover (100), a spiral coil (200), a heat storage tank body (300), and a microchannel heat exchanger (400) , phase change material (500); The top cover (100) and the heat storage tank body (300) are matched and installed, and the phase change material (500) is contained in the accommodation space (800) surrounded by the heat storage tank body (300) and the top cover (100); The spiral coil (200) is installed inside the heat storage tank (300) and submerged in the phase change material (500); The spiral coil (200) extends to the outside of the accommodation space (800) to form a fluid inlet (201) and a fluid outlet (202); The microchannel heat exchanger (400) is closely attached to the outside of the heat storage tank (300). 2. The phase change energy storage tank system suitable for data centers according to claim 1, characterized in that, the fluid inlet (201) and the fluid outlet (202) pass through the tank wall of the heat storage tank (300) and extend the convex Out of the outer surface of the heat storage tank body (300); The inner wall of the spiral coil (200) has an internal thread (210); The number of spiral coils (200) is one or more; The heat exchange working medium in the spiral coil tube (200) is liquid or gaseous. 3. The phase change energy storage tank system suitable for data centers according to claim 1, wherein the heat storage tank (300) is a cylindrical tank; The material of the heat storage tank body (300) is corrosion-resistant; No chemical reaction occurs between the heat storage tank body (300) and the phase change material (500). 4. The phase change energy storage tank system suitable for data centers according to claim 1, characterized in that the microchannel heat exchanger (400) is mainly composed of a plurality of microchannel flat tubes (403) connected in parallel; Each microchannel flat tube (403) of the microchannel heat exchanger (400) is closely attached to the outside of the heat storage tank (300); The microchannel heat exchanger (400) is filled with gas-liquid phase working medium; The microchannel (405) in the microchannel flat tube (403) has toothed fins (404); The circumferential outer side of the heat storage tank body (300) and the outer side of the top cover (100) are entirely covered with thermal insulation material (600). 5. The phase change energy storage tank system suitable for data centers according to claim 4, characterized in that the microchannel heat exchanger (400) includes a condensation end (401) and an evaporation end (402); Along the heat flow direction of the microchannel heat exchanger, the evaporation end (402) is located upstream, and the condensation end (401) is located downstream; The evaporation end (402) is tightly and sealed connected with the condensation end (401) through the heat exchanger pipe (021). 6. The phase change energy storage tank system suitable for data centers according to claim 1, wherein the fluid (700) enters the spiral coil (200) from the fluid inlet (201); The fluid (700) and the phase change material (500) exchange heat through the spiral coil (200); When the phase change material (500) reaches the phase change temperature, the phase change material changes from a liquid state to a solid state to realize heat release; The phase change material (500) is a solid-liquid phase change material. 7. The phase change energy storage tank system suitable for data centers according to claim 5, characterized in that, the evaporation end (402) transfers the heat of the data center to the condensation end (401); The condensation end (401) exchanges heat with the phase change material (500) through the heat storage tank (300); When the phase change material (500) reaches the phase change temperature, the phase change material changes from solid to liquid to realize heat storage. 8. A data center platform, characterized by comprising: a data center, a phase change energy storage tank system suitable for a data center according to any one of claims 1 to 8; The phase change energy storage tank system suitable for data centers can collect and store the waste heat of the data center, and can release the collected and stored heat as a heat source. 9. The data center platform according to claim 8, further comprising a control system (900): Under the control of the control system (900), intelligent control can be realized according to the temperature of the data center and the form of the phase change material (500), including: When the phase change material (500) is in solid state, the control system (900) can be automatically activated to transfer waste heat from the data center to the phase change material (500) through the microchannel heat exchanger (400) for storage; When the phase change material (500) is in the liquid phase, the control system (900) can automatically start according to the needs of the user, so that the fluid (700) flows from the fluid inlet (201) into the spiral coil (200), thereby realizing the phase change material ( 500) of the heat stored in the release.