JP2014041875A - Air flow optimization means in mounting ict device on cabinet - Google Patents

Abstract

The present invention provides a diffuser design method for airflow optimization by a diffuser for realizing high-efficiency cooling and high-density mounting when mounting an ICT device in which intake and exhaust directions are not aligned.
When a plurality of ICT devices are mounted in a cabinet so as to be stacked in parallel, and when the intake surface and the exhaust surface of each ICT device are opposed to the inner wall of the cabinet, the intake surface and the A diffuser for blocking / inducing airflow provided between the exterior surface of the ICT device and the inner wall of the cabinet so as to form an intake duct and an exhaust duct for separating intake and exhaust on the exhaust surface, The intake and exhaust areas of the intake duct and the exhaust duct are designed to exceed the smaller one of the intake area and the exhaust area of the ICT device.
[Selection] Figure 2

Description

  The present invention relates to airflow optimization means when mounting an ICT device in a cabinet, and more particularly to a diffuser design method for optimizing the airflow in a cabinet in order to improve the cooling efficiency of the ICT device.

  In recent years, with the spread of the Internet and ICT services, power consumption in communication machine rooms and data centers has increased significantly. In particular, the amount of heat generated is rapidly increasing due to the higher functionality and higher density of communication devices and server machines (hereinafter referred to as ICT devices).

  This type of ICT equipment has a dedicated operating room (space) that is temperature-controlled at an appropriate temperature in order to perform processing of a huge amount of data with multiple units arranged in an orderly manner. It is done to install.

  In this dedicated room, a plurality of ICT devices are mounted and supported in a form of stacking in parallel while securing a gap between the vertical direction in a cabinet (equipment storage rack) having a width and depth of one unit. The cabinets are laid out in a row. If there is a need to install multiple rows of cabinets, the layout should be such that the front of the ICT equipment faces the front. This type of ICT equipment generates heat during data processing and other operations, and the rise in temperature causes failure and malfunction.Therefore, the air inside the ICT equipment and the cabinet is expelled to the outside and exhaust air is taken in. Heat treatment is necessary, and cooling is effectively performed by using the outside air taken in as cold air (fluid).

  Furthermore, in this dedicated room, cold air is blown out between the opposing cabinet rows to form a cold air space (cold aisle), which flows into the gaps between the individual ICT equipment in the cabinet. Non-Patent Document 1 proposes that the heat is exchanged while the gas is allowed to flow out from the back side to be efficiently cooled.

  FIG. 1 shows an example of a device mounted on a cabinet in the cold aisle system in the prior art. In each ICT device mounted in the cabinet, the cold aisle 103 faces in front of the front of the ICT device, and the hot aisle 102 faces in the back of the back of the ICT device. An intake port 104 is provided on the side surface of the ICT device, and a certain gap is provided between the cabinet side panel 101 and the side surface of the ICT device.

Edited by NTT Facilities Co., Ltd. “Starts sales of“ air capping ”air-conditioning air flow control product that achieves optimal temperature environment and energy saving in data center” News Release November 19, 2008, http: //www.ntt- f.co.jp /news/heisei20/h20-1119.html

  However, even when the cold aisle method is adopted, the cold aisle / hot aisle method such as the horizontal direction and the vertical direction as shown in FIG. 1, not the front-rear direction of the ICT equipment facing the cold aisle / hot aisle. When an ICT device (NW device such as a switch) that does not match the above is mounted in the cabinet, as shown in FIG. 1, the mixture of the cold air supplied from the air conditioner and the warm air exhausted by the ICT device (A) Insufficient intake / exhaust area (the opening area between the ICT device and the cabinet (shaded area) is narrow (B)) may cause a decrease in the cooling efficiency of the ICT device and an increase in heat generation load.

  For this reason, it is necessary to unify the air intake surface of the cabinet where the ICT equipment is mounted and optimize the airflow environment by installing a diffuser for ICT equipment where the intake and exhaust directions are not aligned. was there.

  In order to solve the above problems, the present invention optimizes airflow when mounting ICT equipment in a cabinet by using a diffuser for realizing high-efficiency cooling and high-density mounting, in which the intake and exhaust directions are not aligned. It aims to provide a means.

  In order to achieve such an object, the present invention according to claim 1 is mounted in a cabinet such that a plurality of ICT devices are stacked in parallel, and the intake surface and the exhaust surface of each ICT device have the above-mentioned When facing the inner wall of the cabinet, the outer surface of the ICT device and the inner wall of the cabinet are formed to form an intake duct and an exhaust duct, respectively, for separating intake air and exhaust air on the intake surface and the exhaust surface. Provided with a diffuser for blocking / inducing airflow, and the intake and exhaust areas of the intake duct and the exhaust duct are designed to exceed the smaller one of the intake area and the exhaust area of the ICT device. Features.

  Invention of Claim 2 is an airflow optimization means at the time of the cabinet mounting of the ICT apparatus of Claim 1, Comprising: The said diffuser provided in the intake surface and the exhaust surface of each said ICT apparatus is L-shaped. The intake duct and the exhaust duct are formed by a diffuser of each ICT device and a part of the diffuser of another ICT device adjacent to the inner wall of the cabinet.

  Invention of Claim 3 is an airflow optimization means at the time of the cabinet mounting of the ICT apparatus of Claim 1, Comprising: When there is a space between each said ICT apparatus and the said other adjacent ICT apparatus The airflow between the intake duct and the exhaust duct of each of the ICT devices is ensured and the airflow between the intake duct and the other of the adjacent ICT devices is secured. A diffuser provided on an exterior surface of each of the ICT devices constituting the space is provided so as to form a duct.

  The invention according to claim 4 is mounted in a cabinet so that a plurality of ICT devices are stacked in parallel, and the intake surface of each ICT device faces the exhaust surface of another adjacent ICT device, and the exhaust of each ICT device When the surface faces the intake surface of the other adjacent ICT device, the intake surface and the exhaust surface, provided with an intake duct and an exhaust duct for separating intake and exhaust, the intake duct and the The intake area and the exhaust area of the exhaust duct are designed to exceed the smaller one of the intake area and the exhaust area of the ICT device.

  The invention according to claim 5 is airflow optimization means when the ICT device according to any one of claims 1 to 4 is mounted in a cabinet, and is a guide provided at an inlet of the intake duct. A vane is provided.

  As described above, according to the present invention, the design of the diffuser for airflow optimization by the diffuser to realize high-efficiency cooling and high-density mounting at the time of cabinet mounting of the ICT device whose intake and exhaust directions are not aligned. It becomes possible to provide the law.

It is a figure which shows an example of a cold aisle system in a prior art. It is a figure which shows the shielding board which rectifies | straightens the intake / exhaust direction of the ICT apparatus back and forth in the 1st Embodiment of this invention, and suppresses mixing of the cool air and warm air in a cabinet, (a) is side intake / exhaust ICT It is a figure in the case of an apparatus, (b) is a figure in the case of an up-and-down intake / exhaust ICT apparatus. It is a figure which shows the aperture ratio of the mesh of the opening part of ICT apparatus. It is a figure which shows the opening area and intake / exhaust area in the 1st Embodiment of this invention, (a) is a figure which shows the case of a horizontal intake / exhaust ICT apparatus, (b) is an up-and-down intake / exhaust ICT apparatus It is a figure which shows the case of. (A) is a figure which shows having further equipped with the baffle plate and the mounting rail in the ICT apparatus provided with the diffuser in the 2nd Embodiment of this invention, (b) is the 2nd of this invention It is a figure which shows having expanded the intake area when the intake area at the time of cabinet mounting is insufficient with respect to the apparatus design specification in embodiment. It is a figure explaining the effect of the guide vane installed in an inflow mouth in a 3rd embodiment of the present invention. (A) is a figure which shows the example of guide vane attachment to the ICT apparatus lower part in the 3rd Embodiment of this invention, (b) is to the ICT apparatus side part in the 3rd Embodiment of this invention. It is a figure which shows the example of guide vane attachment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 2 shows a shielding plate that rectifies the intake / exhaust direction of the ICT device back and forth in the first embodiment of the present invention and suppresses mixing of cool air and warm air in the cabinet, and FIG. The case of an intake / exhaust ICT device is shown, and FIG. 2B shows the case of an upper / lower intake / exhaust ICT device.

  In the present invention, the shielding plate (diffuser) provided in the ICT device rectifies the intake / exhaust direction of the ICT device back and forth, and suppresses mixing of cool air and warm air in the cabinet. The space to be exhausted is shielded from being the same in the cabinet. In the case of the lateral intake / exhaust ICT device 201 shown in FIG. 2A, the intake surface is provided between the outer wall of the intake-side ICT device and the inner wall of the cabinet panel so that cold air is supplied only from the front surface 211. Shields the upper part of the side of the ICT device on the intake side and the back of the side of the ICT device in the space to be formed. In this case, the lower part of the side surface of the ICT device on the intake side is shielded by the shielding plate (intake side diffuser) of the ICT device installed in the lower stage of the cabinet, and the cold air is supplied only from the front surface 211.

  The exhaust surface is shielded by the exhaust side diffuser 202 so that the exhaust heat is exhausted only to the back surface 212, the lower side of the ICT device side and the front of the ICT device side. The shield plate is designed and installed so that there is no gap between the cabinet side panel and the ICT equipment. In the case of an up-and-down intake / exhaust ICT device 204 as shown in FIG. 2B, both the intake and exhaust surfaces are covered with ducts, the intake surface is only the front surface 221 so that cold air is supplied only from the front surface 221, and the exhaust surface is exhaust heat. Only the back surface 222 is set as an opening so that the air is exhausted only to the back surface 222.

  Further, the diffuser needs to be designed so that the area of the opening when the diffuser and the cabinet are mounted exceeds the intake / exhaust area of the device design specification. When a shielding plate or the like is installed without satisfying this condition, the cooling efficiency of the ICT device is reduced due to a lack of necessary air volume, which may lead to an increase in temperature inside the ICT device.

  FIG. 3 shows the mesh opening ratio of the opening of the ICT device. The meshes 301 to 303 are an example of an opening mesh (reference URL http://www.punting-center.co.jp/gnav01.html).

The intake / exhaust area required by the ICT equipment is calculated based on the following formula based on the design specifications for the intake / exhaust area of the ICT equipment. As the intake / exhaust area, the smaller of the intake area and the exhaust area is adopted.
(Required intake / exhaust area of the ICT equipment) = (Open area of the intake or exhaust surface of the ICT equipment) x (Mesh opening ratio) (Equation 1)

  However, the opening area of the intake or exhaust surface of the ICT device represents the area where the mesh is installed on the side surface of the ICT device in the case of side intake and exhaust, and on the upper and lower surface of the ICT device in the case of the vertical intake and exhaust surface.

  In addition, about a mesh aperture ratio, when an exact numerical value is unknown, it is set to 0.3-0.5. In the case of honeycomb mesh, it is about 0.6.

  FIG. 4 shows the opening area and the intake / exhaust area in the first embodiment of the present invention, FIG. 4 (a) shows the case of a lateral intake / exhaust ICT device, and FIG. The case of ICT equipment is shown. 4 (a) and 4 (b) respectively show the intake / exhaust area (including the mesh opening ratio in the opening) in the apparatus design specifications, and the right views in FIGS. 4 (a) and 4 (b) respectively. The intake / exhaust area when the diffuser and cabinet are mounted is shown.

  The opening area and intake / exhaust area for a specific ICT device refer to the area shown in FIGS. 4 (a) and 4 (b). The intake / exhaust area required by the ICT device according to Equation 1 Design the shape of the diffuser to ensure That is, it is necessary to design the diffuser so that the intake / exhaust area when the diffuser and the cabinet are mounted exceeds the intake / exhaust area of the device design specification. Also, select a mounting method that can secure the space between ICT devices mounted in the cabinet so that the diffuser can be mounted.

(Second Embodiment)
5 (a) and 5 (b), in the second embodiment of the present invention, the ICT device provided with the diffuser is further provided with a rectifying plate and a mounting rail, and the intake air when the cabinet is mounted according to the device design specifications. The structure which expands an area is shown.

  The second embodiment shown in FIG. 5 (a) is the first embodiment of the present invention shown in FIG. 2, and there is an attachment portion for mounting on a cabinet or other ICT device at the lower part of the ICT device. In this case, an air inlet is provided on the lower surface of the front part of the ICT device, an opening is provided to secure an air flow between the bottom surface and the side surface of the ICT device, and the rectifier plate is directed to the air intake port on the diagonal line on the bottom surface of the ICT device. This is an installed mode.

  If the intake / exhaust area of the horizontal intake / exhaust direction ICT device is less than the device design specification when the diffuser and cabinet are mounted, the intake / exhaust area is expanded using the space above and below the ICT device as shown in FIG. At this time, a rectifying plate 503 is required to be installed on at least one of the upper and lower surfaces of the ICT device and separates the cool air and the warm air. An opening for securing the airflow is provided.

  Referring to FIG. 5 (b), the intake air from only the front side surface of the ICT device as shown in FIG. 2 cannot supply the required cold air to the ICT device, but the rectifying plate 503 shown in FIG. By using the intake air from the lower surface of the front of the ICT device, it is possible to supply the necessary cold air to the ICT device.

As a specific example, the device design specification in the left diagram of FIG.
D63.5 [cm] x H28.58 [cm] (opening size) x 0.35 (mesh opening ratio) ≒ 635.2 [cm ² ] (Formula 2)
On the other hand, the first intake area when the cabinet is mounted in the right diagram of FIG.
W12 [cm] (gap with cabinet panel) x H36 [cm] (including mounting rail height) = 432 [cm ² ] (Formula 3)
It becomes. And when installing a diffuser and expanding the intake area, the second intake area is
432 [cm ² ] (first intake area) + W44.32 [cm] x H7.42 [cm] (mounting rail height) ≒ 760.8 [cm ² ] (Formula 4)
It becomes. However, since the mounting rail has an opening, the actual intake area is
432 [cm ² ] (first intake area) +245 [cm ² ] (opening area) = 677 [cm ² ] (Formula 5)
It is. From the above, the air intake area 432 [cm ² ] when the cabinet is mounted in the right diagram of FIG. 5B is insufficient with respect to the device design specification 635.2 [cm ² ] in the left diagram of FIG. 5B. However, 677 [cm ² ] satisfies the condition when the diffuser is installed to increase the intake area.

  Even when the diffuser is mounted, for example, in the case of an ICT device with an air supply / exhaust surface in the vertical direction shown in FIG. 2B, when there is a gap between the side surface of the ICT device and the inner wall of the cabinet, etc. In order to prevent cold air and warm air from mixing through the gaps between ICT devices or between the ICT devices and the inner wall of the cabinet, a space for the ICT devices to suck in cool air or a space for the ICT devices to discharge warm air Except for the gap on the front or back of the cabinet, it is shielded with a blank panel.

(Third embodiment)
When the flow velocity flowing into the intake surface when the diffuser is mounted is high, flow resistance is formed by a vortex phenomenon that occurs in the vicinity of the inlet, and there is a possibility that a substantial intake area may not be secured. In such a case, a guide vane is designed and installed at the inlet when the cabinet is mounted for the purpose of improving the intake and exhaust efficiency.

  In FIG. 6, the figure explaining the effect of the guide vane installed in an inflow port in the 3rd Embodiment of this invention is shown. When the flow velocity is fast, the substantial suction area is reduced when there is no guide vane as shown in FIG. 6A, and when the guide vane is present as shown in FIG. The area is expanded and the intake and exhaust resistance is improved.

  The guide vane is a guide plate installed at an angle with respect to the inflow surface, and has an effect of substantially increasing the intake / exhaust area.

  FIGS. 7A and 7B show that guide vanes 701 and 702 are attached to the ICT apparatus in the second embodiment of the present invention shown in FIG. FIG. 7A shows an example of attaching the guide vane 701 to the lower part of the ICT device in the third embodiment of the present invention, and FIG. 7B shows the ICT device side in the third embodiment of the present invention. The example of the guide vane 702 attachment to a part is shown.

  However, the shape and installation method are required so as not to obstruct the insertion / extraction of the communication line, power line, and package of the horizontal and vertical intake / exhaust ICT equipment. Regarding the guide vane installation location, angle, and length, in principle, the opening shape is about 45 ° with respect to the inlet with a high flow velocity, and the length that protrudes in the inflow direction is about 3 to 5 cm. design.

  As described above, according to one aspect of the present invention, by installing a diffuser for an ICT device whose intake and exhaust directions are inconsistent, it is possible to suppress the circulation of exhaust heat in the cabinet of the ICT device and By suppressing the increase in pressure loss due to exhaust and optimizing the air flow environment in the cabinet, the cooling efficiency of the ICT device can be increased and the temperature inside the ICT device can be lowered. In addition, as an accompanying effect, an energy saving effect by relaxing the air conditioner setting as the temperature of the ICT equipment decreases, and an effect of consolidating floor space by increasing the number of units that can be mounted in the cabinet can be expected.

DESCRIPTION OF SYMBOLS 101 Cabinet side panel 102 Hot aisle 103 Cold aisle 104 Inlet 201,204,401,404 ICT apparatus 202,205,402,405,501 Exhaust side diffuser 203,206,403,406,502 Intake side diffuser 211,221, 411, 421 Front surface 212, 222, 412, 422 Rear surface 301, 302, 303 Mesh 503 Current plate 504 Mounting rail opening 601, 602 Flow path 603, 701, 702 Guide vane

In order to achieve the above object, the present invention is characterized in that the invention according to claim 1 is mounted on a cabinet so that a plurality of ICT devices are stacked in parallel, and is covered with a mesh of each ICT device. When the exhaust surface faces the inner wall of the cabinet, the exterior surface of the ICT device and the cabinet are formed so as to form an intake duct and an exhaust duct, respectively, for separating intake air and exhaust air on the intake surface and the exhaust surface. A diffuser for blocking / inducing an air flow provided between the intake wall and the exhaust duct, and the intake area and the exhaust area of the intake duct and the exhaust duct include an opening area of the intake surface or the exhaust surface and an opening of the mesh. It is designed to exceed the smaller one of the intake area and the exhaust area of the ICT device determined by the product of the rate .
Invention of Claim 2 is the airflow optimization means at the time of cabinet mounting of the ICT apparatus of Claim 1, Comprising: The inlet of the said intake duct is the said ICT apparatus adjacent to the said intake surface and the said ICT apparatus. And an exhaust port of the exhaust duct is formed as an L-shaped opening including the exhaust surface and the second surface of the ICT device adjacent to the exhaust surface. In addition, a rectifying plate is provided diagonally on the first and second surfaces of the ICT apparatus.

The invention described in claim 3 is airflow optimization means when the ICT device according to claim 1 or 2 is mounted in a cabinet, wherein the diffusers provided on the intake surface and the exhaust surface of each ICT device are L The intake duct and the exhaust duct are formed by a diffuser of each ICT device and a part of the diffuser of another ICT device adjacent to the inner wall of the cabinet.

Invention of Claim 4 is an airflow optimization means at the time of the cabinet mounting of the ICT apparatus of Claim 1 or 2 , Comprising: There is a space between each said ICT apparatus and the said other adjacent ICT apparatus. In some cases, the air flow between the intake duct and one of the exhaust ducts of each ICT device and the other of the intake duct and the exhaust duct of the adjacent other ICT device is A diffuser provided on an exterior surface of each ICT device constituting the space is provided so as to form a secured duct.

The invention according to claim 5 is mounted in a cabinet so that a plurality of ICT devices are stacked in parallel, and an intake surface covered with a mesh of each ICT device faces an exhaust surface of another adjacent ICT device, When the exhaust surface covered with the mesh of each ICT device faces the intake surface of the other adjacent ICT device, an intake duct provided on the intake surface and the exhaust surface for separating intake and exhaust, and An exhaust duct, and the intake area and the exhaust area of the exhaust duct are determined by the product of the intake surface or the opening area of the exhaust surface and the opening ratio of the mesh. It is designed to exceed the smaller area.

Invention of Claim 6 is an airflow optimization means at the time of the cabinet mounting of the ICT apparatus as described in any one of Claims 1 thru | or 5 , Comprising: The guide vane provided in the inflow port of the said intake duct is provided. It is characterized by providing.

Claims (5)

When a plurality of ICT devices are mounted in a cabinet so as to be stacked in parallel, and the intake surface and the exhaust surface of each ICT device face the inner wall of the cabinet,
Blocks and guides airflow provided between the exterior surface of the ICT device and the inner wall of the cabinet so as to form an intake duct and an exhaust duct for separating intake air and exhaust air on the intake surface and the exhaust surface, respectively. With a diffuser
An airflow optimization means when the ICT device is mounted in a cabinet, wherein the intake area and the exhaust area of the intake duct and the exhaust duct are designed to exceed the smaller one of the intake area and the exhaust area of the ICT apparatus.   The diffuser provided on the intake surface and the exhaust surface of each ICT device is formed in an L shape, and the intake duct and the exhaust duct are adjacent to the diffuser of each ICT device and the inner wall of the cabinet. The air flow optimization means when the ICT device is mounted in a cabinet according to claim 1, wherein the ICT device is mounted on a part of the diffuser of the device.   When there is a space between each ICT device and the other adjacent ICT device, a duct securing an air flow between the intake duct and the exhaust duct of each ICT device and the other adjacent ICT device Characterized in that it comprises a diffuser provided on the exterior surface of each ICT device that constitutes the space so as to form a duct that secures an airflow between the other of the intake duct and the exhaust duct of the ICT device. The airflow optimization means at the time of the cabinet mounting of the ICT apparatus of Claim 1. A plurality of ICT devices are mounted in a cabinet so as to be stacked in parallel, the intake surface of each ICT device faces the exhaust surface of another adjacent ICT device, and the exhaust surface of each ICT device is the other adjacent ICT device When facing the air intake surface of
Provided with an intake duct and an exhaust duct provided on the intake surface and the exhaust surface for separating intake and exhaust;
An airflow optimization means when the ICT device is mounted in a cabinet, wherein the intake area and the exhaust area of the intake duct and the exhaust duct are designed to exceed the smaller one of the intake area and the exhaust area of the ICT apparatus.   The airflow optimizing means when the ICT device is mounted on a cabinet according to any one of claims 1 to 4, further comprising a guide vane provided at an inlet of the intake duct.

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