WO2021230525A1

WO2021230525A1 - Highly efficient heat pipe cooling system

Info

Publication number: WO2021230525A1
Application number: PCT/KR2021/005198
Authority: WO
Inventors: 정춘식
Original assignee: 정춘식
Priority date: 2020-05-11
Filing date: 2021-04-23
Publication date: 2021-11-18
Also published as: KR102179343B1

Abstract

The present invention relates to a highly efficient heat pipe cooling system comprising a first structure and a second structure which are provided on server racks so as to traverse between the two server racks, and are stacked vertically, wherein the first structure has a plurality of first heat pipes connecting a first water inlet pipe and a first water discharge pipe, a cooling water in the first water inlet pipe is transferred to the first water discharge pipe through the plurality of first heat pipes, the second structure has a plurality of second heat pipes connecting a second water inlet pipe and a second water discharge pipe, the cooling water in the first water discharge pipe is transferred to the second water inlet pipe, the cooling water in the second water inlet pipe is transferred to the second water discharge pipe through the plurality of second heat pipes, and the cooling water reciprocates between the two server racks through the first heat pipes and second heat pipes. The present invention can effectively absorb heat by means of natural convection of air heated by the heat generated from a server, without a separate power source for forced convection of air surrounding the server.

Description

Heat pipe high efficiency cooling system

The present invention relates to a heat pipe high-efficiency cooling system, and more particularly, it can effectively absorb heat by using the natural convection phenomenon of air heated by heat generated from a server without a separate power source for forced convection of air around the server. It relates to a high-efficiency cooling system using a heat pipe.

Servers, network equipment, enterprise equipment, etc. provided in a data center generate heat. Therefore, the data center that operates these equipment is also operating a large-scale facility to cool the heat.

Servers are typically located in racks within a data center. Physical configurations for racks vary. A typical rack configuration includes mounting rails on which multiple equipment units, such as server blades, are mounted and stacked vertically within the rack. One of the most widely used 19-inch racks is the standard system for mounting equipment such as 1U or 2U servers. One rack unit on this type of rack is 175 inches high and 19 inches wide. A Rack-Mounted Unit (RMU) server that can be installed in one rack unit is generally called a 1U server. In a data center, standard racks are usually densely populated with servers, storage devices, switches and/or telecommunication equipment. Fanless RMU servers are used in some data centers to increase density and reduce noise.

Data center rooms must be maintained at an acceptable temperature and humidity for reliable operation of servers, especially fanless servers. The power consumption of a densely stacked rack of servers powered by Opteron or Xeon processors can be between 7,000 and 15,000 watts. As a result, server racks can generate very concentrated heat loads. The heat dissipated by the servers in the rack is exhausted to the data center room. The heat generated collectively by densely placed racks can adversely affect the performance and reliability of the equipment within the racks as it relies on ambient air for cooling. Therefore, the design of heating, ventilation, and cooling systems is an important part of an efficient data center. And in such a cooling system, a heat pipe is used as a cooling means.

(Prior art literature)

(Patent Document 1) Republic of Korea Utility Model Publication No. 20-0479829 (2016.03.10.)

(Patent Document 2) Republic of Korea Patent Publication No. 10-1354366 (Jan. 22, 2014)

(Patent Document 3) Republic of Korea Patent Publication No. 10-2005-0017632 (2005.02.22.)

An object of the present invention is to provide a heat pipe high-efficiency cooling system that can effectively absorb heat by using the natural convection phenomenon of air heated by heat generated from a server without a separate power source for forced convection of air around the server. .

In order to achieve the above object, the high-efficiency heat pipe cooling system of the present invention is installed on the server rack so as to cross between the two server racks, and includes a first structure and a second structure that are stacked up and down, The first structure has a structure in which a plurality of first heat pipes connect a first inlet pipe and a first water outlet pipe, and the cooling water of the first inlet pipe is directed to a first outlet pipe through a plurality of first heat pipes. is transmitted, and the second structure has a structure in which a plurality of second heat pipes connect a second inlet pipe and a second water outlet pipe, and the cooling water of the first water outlet pipe is transmitted to the second inlet pipe, and the The cooling water of the second inlet pipe is transferred to the second outlet pipe through a plurality of second heat pipes, and the cooling water reciprocates between the two server racks through the first heat pipe and the second heat pipe.

Specifically, one end of the first inlet pipe is connected to the cooling water supply unit to receive cooling water, the other end of the first inlet pipe is blocked, one end of the first water outlet pipe is blocked, and the other end of the first water outlet pipe is It is connected to one end of the second inlet pipe, the other end of the second inlet pipe is blocked, and the second water outlet pipe has one end blocked and the other end open.

In addition, the first heat pipe and the second heat pipe disposed vertically are installed at positions that are crossed from each other.

And the first heat pipe and the second heat pipe each has a spiral shape for inducing the flow of heating air rising between the two server racks, the spiral shape is formed, the spiral shape formed in the first heat pipe and the second 2 The winding directions of the spiral valleys formed in the heat pipe are opposite to each other.

and the first heat pipe includes a fluid pipe accommodating the working fluid, and a cooling water pipe installed inside the fluid pipe and through which the coolant passes,

The fluid pipe has a shape in which a convex part is wrapped in a spiral shape, a concave groove is formed inside the fluid pipe corresponding to the position of the convex part, and the working fluid is divided and accommodated in the concave groove along the longitudinal direction of the fluid pipe. .

The heat pipe high-efficiency cooling system of the present invention can maximize the cooling effect by effectively absorbing heat by using the natural convection phenomenon of the air heated by the heat generated from the server without a separate power source for forced convection of the rigging around the server.

In addition, according to the present invention, since the cooling water passes through the heat pipe without changing the direction of flow in the heat pipe, the load on the cooling water is reduced, thereby increasing the circulation speed of the cooling water and improving the cooling efficiency.

In addition, according to the present invention, a concave groove is formed inside the fluid pipe so that the working fluid is divided and accommodated along the longitudinal direction of the fluid pipe, so that even if the heat pipe is inclined to one side and the working fluid flows in the inclined direction, it is operated under the concave groove As the fluid remains, heat can be absorbed by the working fluid throughout the longitudinal direction of the heat pipe, and a small amount of the working fluid remaining in each concave groove absorbs heat from the heating air and rapidly changes phase, thereby further improving heat transfer to the cooling water. can be done quickly.

In addition, by forming a spiral valley guiding the flow of heating air on the outside of the fluid pipe of the present invention, it is possible to increase the flow of heating air in contact with the fluid pipe surface and increase the contact time, thereby increasing the heat transfer effect.

In addition, in the present invention, the first heat pipe and the second heat pipe are positioned to cross each other, and the winding directions of the spiral valley formed in the first heat pipe and the spiral valley formed in the second heat pipe are opposite to each other, By delaying the time for the heating air to rise while passing through the first heat pipe and the second heat pipe, the contact time between the heating air and the first heat pipe and the second heat pipe may be increased.

1 is a view schematically showing a heat pipe high-efficiency cooling system installed on an upper portion of a server rack according to an embodiment of the present invention.

2 is a perspective view of a first structure and a second structure of a heat pipe high-efficiency cooling system according to an embodiment of the present invention;

Figure 3 is a view for showing the inside by cutting the fluid pipe according to the embodiment of the present invention.

4 is a diagram schematically illustrating an arrangement structure of a first heat pipe, a second heat pipe, and a third heat pipe according to an embodiment of the present invention;

5 is a perspective view illustrating a first heat pipe and a second heat pipe according to an embodiment of the present invention;

Hereinafter, a heat pipe high-efficiency cooling system of the present invention will be described in detail with reference to the accompanying drawings.

The heat pipe high-efficiency cooling system of the present invention is installed for the purpose of cooling the server room, and is installed above the server rack (R) so as to cross between the two server racks (R).

As shown in FIG. 1 , the heat pipe cooling system according to an embodiment of the present invention basically includes a first structure 100 , a second structure 200 , and a third structure 300 that are sequentially stacked up and down. However, in the heat pipe cooling system of the present invention, the number of structures may be increased by omitting the third structure 300 or adding a fourth structure (not shown) according to the size of the server room and required cooling performance.

In the following description, the first structure 100 , the second structure 200 , and the third structure 300 will be described in detail.

As shown in FIG. 2 , the first structure 100 has a structure in which a plurality of first heat pipes 130 connect the first inlet pipe 110 and the first water outlet pipe 120 . The first inlet pipe 110 and the first water outlet pipe 120 are disposed side by side with each other, and the plurality of first heat pipes 130 are disposed between the first inlet pipe 110 and the first water outlet pipe 120 . The inlet pipe 110 and the first outlet pipe 120 are connected.

One end of the first water inlet pipe 110 is connected to a cooling water supply unit (not shown) to receive cooling water. And the other end of the first inlet pipe 110 is blocked. Accordingly, the cooling water supplied to the first inlet pipe 110 is transferred to the first outlet pipe 120 through the first heat pipe 130 . In addition, one end of the first water outlet pipe 120 is blocked and the other end is connected to the second structure 200 , so that the cooling water is delivered to the second structure 200 . Specifically, the first water outlet pipe 120 is connected to the second water inlet pipe 210 of the second structure 200 to deliver the cooling water.

The first heat pipe 130 connecting the first inlet pipe 110 and the first water outlet pipe 120 includes a fluid pipe 10 and a cooling water pipe 20 as shown in FIG. 3 . A working fluid is accommodated in the fluid pipe 10 , and a cooling water pipe 20 through which the cooling water passes is installed in the sealed fluid pipe 10 . The fluid pipe 10 is formed in a shape in which the convex portion 11 is wrapped in a spiral shape. And a concave groove 12 is formed inside the fluid pipe 10 corresponding to the position of the convex portion 11 . The working fluid is divided and accommodated in the concave groove 12 formed in the lower portion of the fluid pipe 10 along the longitudinal direction of the fluid pipe 10 . And between the convex portions 11, a spiral-shaped spiral bone 13 is formed. In addition, a spiral shape of the spiral bone 21 is also formed on the outside of the cooling water pipe 20 . The cooling water pipe 20 is installed side by side with the fluid pipe 10 inside the fluid pipe 10 and passes through the fluid pipe 10 .

The first heat pipe 130 is formed in a shape in which the outer side of the fluid pipe 10 is surrounded by the convex portion 11 in a spiral shape, so that the contact area in contact with the heating air increases, and as the heating air rises, the fluid pipe ( When passing through the surface of 10), the flow of heated air is induced in a spiral form by the spiral bone 13, thereby increasing the contact time between the heated air flowing along the surface of the fluid pipe 10 and the fluid pipe 10. .

And even if the first heat pipe 130 is inclined at a predetermined angle to either side, the entire working fluid is not completely tilted to the inclined either side of the fluid pipe 10 , and the concave groove 12 formed inside the fluid pipe 10 is lower. By remaining divided along the longitudinal direction of the fluid pipe 10, the working fluid in the entire fluid pipe 10 can absorb heat from the heated air. In addition, since the amount of the working fluid divided and accommodated in the concave groove 12 formed in the lower portion of the fluid pipe 10 is small, the amount of the working fluid is absorbed and the phase change occurs more rapidly to achieve heat transfer with the cooling water pipe 20 . can

According to the above-described effect, the first heat pipe 130 of the present invention can be cooled by effectively absorbing heat generated from the server by increasing the heat transfer amount and heat transfer efficiency with the heated air.

On the other hand, the working fluid accommodated in the fluid pipe 10 is acetone (acetone) 41 to 46 parts by weight, alcohol (alcohol) 20 to 30 parts by weight, sulfuric ether (surfuricether) 5 to 10 parts by weight, 1,2-propylene It may include 5 to 10 parts by weight of glycol (1,2-propylene glycol; HOCH2CH3CHOH). In addition, the working fluid is methylbenzotriazole (5-methtlbenzole; C7H7N3) 000035 to 000045 kg and sodium tripolyphosphate (Na5P3O10) 000028 for 100 kg of a mixed solution of acetone, alcohol, sulfuric ether, and 1,2-propylene glycol. It can contain ~000032 kg.

1,2-Propylene glycol is mixed with distilled water in a fixed ratio as described above, and has an excellent effect as a carrier for heat transfer and heat exchange. In addition, 1,2-propylene glycol has a freezing point of -60°C and is mixed with distilled water to prevent the working fluid from freezing under normal operating conditions or a temperature below it (about -40°C). The working fluid can maintain a constant and stable internal pressure of the fluid pipe 10 without a phase change occurring at about -40 to 130°C. And methylbenzotriazole prevents corrosion of the fluid pipe 10 as a corrosion inhibitor. And sodium tripolyphosphate prevents the formation of foreign substances on the inner peripheral surface of the fluid pipe (10). When a foreign material is formed on the inner circumferential surface of the fluid pipe 10, there is a problem in that the heat absorbing effect is lowered.

As the working fluid accommodated in the fluid pipe 10 , other commonly known working fluids may be used in addition to the illustrated working fluid.

As shown in FIG. 2 , the second structure 200 has a structure in which a plurality of second heat pipes 230 connect the second inlet pipe 210 and the second water outlet pipe 220 . The second inlet pipe 210 and the second water outlet pipe 220 are arranged side by side, and a plurality of second heat pipes 230 are disposed between the second inlet pipe 210 and the second water outlet pipe 220 . The inlet pipe 210 and the second outlet pipe 220 are connected.

The second water inlet pipe 210 has one end connected to the other end of the first water outlet pipe 120 , and the cooling water is transmitted from the first water outlet pipe 120 . And the other end of the second inlet pipe 210 is blocked. Accordingly, the coolant delivered to the second inlet pipe 210 is delivered to the second outlet pipe 220 through the second heat pipe 230 . In addition, one end of the second water outlet pipe 220 is blocked and the other end is opened, so that the cooling water is discharged to the other end of the second water outlet pipe 220 .

The second heat pipe 230 has the same structure as the first heat pipe 130 , but as shown in FIG. 4 , the second heat pipe 230 is located lower than the first heat pipe 130 , The first heat pipe 130 and the second heat pipe 230 are disposed to cross each other. And as shown in FIG. 5 , the winding direction of the spiral valley 13 formed in the second heat pipe 230 is opposite to the winding direction of the spiral valley 13 formed in the first heat pipe 130 .

The third structure 300 has the same shape and structure as the first structure 100 and is located under the second structure 200 . As shown in FIG. 2 , the third water inlet pipe 310 of the third structure 300 is connected to the second outlet pipe 220 of the second structure 200 , and the cooling water flows through the third water inlet pipe 310 . is transmitted And the cooling water is transmitted to the third water outlet pipe 320 through the plurality of third heat pipes 330, and the third water outlet pipe 320 is connected to the cooling water supply unit and the cooling water that has absorbed heat from the heated air is supplied to the cooling water supply unit ( not shown) is returned.

If a fourth structure (not shown) is added, the fourth structure has the same shape and structure as the second structure 200 .

In the heat pipe cooling system as described above, the coolant reciprocates between the two server racks R through the first heat pipe 130 , the second heat pipe 230 , and the third heat pipe 330 . At this time, the cooling water flows in a constant direction through the plurality of cooling water pipes 20 without changing the direction of the flow in the cooling water pipe 20, so the load on the flow of the cooling water is small and the flow rate and supply of the cooling water can be made very quickly. .

That is, the heat pipe high-efficiency cooling system of the present invention can maximize the heat transfer effect by increasing the supply and circulation of cooling water while increasing the contact area and contact time with the heated air.

The heat pipe high-efficiency cooling system according to the present invention is not limited to the above-described embodiment and may be implemented with various modifications within the scope of the technical spirit of the present invention.

Claims

In the heat pipe high-efficiency cooling system installed on the top of the server rack to cross between two server racks,

Including a first structure and a second structure consisting of a structure that is stacked up and down,

The first structure is made of a structure in which a plurality of first heat pipes connect a first inlet pipe and a first water outlet pipe, and the cooling water of the first inlet pipe is a plurality of first heat pipes in which the working fluid is accommodated. It is delivered to the first water outlet pipe through

The second structure is made of a structure in which a plurality of second heat pipes connect a second water inlet pipe and a second water outlet pipe, and the cooling water of the first water outlet pipe is transferred to the second water inlet pipe, and the second water inlet pipe The cooling water of the pipe is delivered to the second outlet pipe through the plurality of second heat pipes in which the working fluid is accommodated,

The coolant reciprocates between the two server racks through the first heat pipe and the second heat pipe,

The first heat pipe and the second heat pipe are each formed with a spiral valley for inducing the flow of heated air rising between the two server racks,

The first heat pipe,

A fluid pipe in which the working fluid is accommodated in the sealed interior;

It is installed inside the fluid pipe to pass through the fluid pipe and consists of a cooling water pipe through which the cooling water passes,

The fluid pipe is made of a shape in which the convex parts are wrapped in a spiral shape, and the spiral valley is formed between the convex parts,

A concave groove is formed inside the fluid pipe corresponding to the position of the convex part, and the working fluid is divided and accommodated in the concave groove along the longitudinal direction of the fluid pipe,

The working fluid absorbs heat from the heating air and transfers it to the cooling water.
The method according to claim 1,

One end of the first inlet pipe is connected to the cooling water supply unit to receive cooling water, the other end of the first inlet pipe is blocked, one end of the first water outlet pipe is blocked, and the other end of the first water outlet pipe is the first 2 A heat pipe high-efficiency cooling system, characterized in that connected to one end of the inlet pipe, the other end of the second inlet pipe is blocked, and the second outlet pipe has one end blocked and the other end open.
3. The method according to claim 2,

The heat pipe high-efficiency cooling system, characterized in that the first heat pipe and the second heat pipe disposed vertically are installed at positions that are staggered from each other.
The method according to claim 1,

The heat pipe high-efficiency cooling system, characterized in that the winding directions of the spiral valley formed in the first heat pipe and the spiral valley formed in the second heat pipe are opposite directions.