JP6607800B2

JP6607800B2 - Cooling system, air conditioning control device, and air conditioning control method

Info

Publication number: JP6607800B2
Application number: JP2016017365A
Authority: JP
Inventors: 潤一伊藤; 隆成水島
Original assignee: Hitachi Ltd
Current assignee: Hitachi Ltd
Priority date: 2016-02-01
Filing date: 2016-02-01
Publication date: 2019-11-20
Anticipated expiration: 2036-02-01
Also published as: JP2017138673A

Description

本発明は、冷却システム、空調制御装置および空調制御方法に関し、特にサーバルームの空調を制御する冷却システム、空調制御装置および空調制御方法に関する。 The present invention relates to a cooling system, an air conditioning control device, and an air conditioning control method, and more particularly to a cooling system, an air conditioning control device, and an air conditioning control method for controlling air conditioning in a server room.

サーバルームには、コンピュータやサーバ等の電子機器（以下、「機器」と称する。）が集約された状態で多数設置され、これらの機器が昼夜にわたって連続稼働している。サーバルームにおける機器の設置は、ラックマウント方式が主流になっている。ラックマウント方式は、機器を機能単位別に分割して収納するラック（筺体）を、キャビネットに段積みする方式であり、かかるキャビネットがサーバルームの床上に多数整列配置されている。ラックに収納されている機器は、前面から低温空気を吸い込み、機器の内部を冷却して、背面から高温空気を排気するものが一般的である。 A large number of electronic devices (hereinafter referred to as “devices”) such as computers and servers are installed in the server room, and these devices are continuously operated day and night. Rack-mounting is the mainstream for installing equipment in server rooms. The rack mount system is a system in which racks (housings) for storing devices divided into functional units are stacked in a cabinet, and a large number of such cabinets are arranged in a line on the floor of a server room. Generally, the equipment stored in the rack sucks low-temperature air from the front, cools the inside of the equipment, and exhausts high-temperature air from the back.

これらの機器は、高温状態になるとシステム停止等のトラブルを引き起こすおそれがあるため、冷却装置によって機器から排気された高温空気を冷却することで、サーバルームは一定の温度環境に管理されている。 Since these devices may cause troubles such as system stoppage when they are in a high temperature state, the server room is managed in a constant temperature environment by cooling the high-temperature air exhausted from the devices by the cooling device.

さらに、サーバルームでは、このようなラック列が、隣接する列の給気面同士および排気面同士を対向させて複数列配置される。つまり、通路（空間）を挟んで給気面同士が対向し、排気面同士が対向するように配置されている。給気面同士で挟まれた空間は、冷却装置で冷却した低温空気が供給されることからコールドアイル（Cold aisle；冷気通路）と呼ばれる。同様に、排気面同士で挟まれた空間は機器からの高温空気が供給されることからホットアイル（Hot aisle；暖気通路）と呼ばれている。 Furthermore, in the server room, such rack rows are arranged in a plurality of rows with the air supply surfaces and the exhaust surfaces of adjacent rows facing each other. That is, the air supply surfaces are opposed to each other across the passage (space), and the exhaust surfaces are opposed to each other. The space sandwiched between the air supply surfaces is called cold aisle because cold air cooled by the cooling device is supplied. Similarly, the space sandwiched between the exhaust surfaces is called hot aisle (hot aisle) because high temperature air is supplied from the equipment.

従来におけるサーバルームの空調方式では、機械室またはサーバルーム壁際に設置されたＣＲＡＣ（Computer Room Air Conditioning）と呼ばれる冷却装置で冷却された低温空気をサーバルームの二重床空間を介してコールドアイルに供給する床吹出し方式が一般的である。しかし、近年では、機器の処理速度や、機器の処理能力の急激な上昇に伴い機器の発熱量が増大し、冷却負荷が増大していることから、一般空調方式の冷却システムに局所的に機器の冷却を行う局所冷却装置を増設する場合や、局所冷却方式において局所冷却装置故障時の冗長用に床吹出し方式を用いる場合など、床吹出し方式と局所冷却方式を併用するケースが増加している。 In the conventional server room air-conditioning system, low-temperature air cooled by a cooling device called CRAC (Computer Room Air Conditioning) installed near the machine room or server room wall is converted into cold aisle through the double floor space of the server room. The floor blowing method to supply is common. However, in recent years, the heat generation amount of equipment has increased with the rapid increase in equipment processing speed and equipment processing capacity, and the cooling load has increased. There are an increasing number of cases where the floor blowing method and the local cooling method are used together, such as when adding a local cooling device that cools the air or when using the floor blowing method for redundancy in the case of a local cooling device failure in the local cooling method. .

サーバルームでは、冷却装置故障時の冗長用空調機が設置されていることと、機器は長時間に亘り段階的に設置されることから、通常は機器の発熱量に対して冷却装置の冷却能力は非常に大きくなっているが、過剰な冷却装置を停止することで室内の温度が上昇することを不安視するあまり、冷却装置の過剰運転を行っている場合が多い。特に、床吹出し方式と局所冷却方式を併用している場合には、どの冷却装置の操作を行えばよいか判定が困難であるため、過剰運転が顕著になっている。 In the server room, redundant air conditioners are installed in the event of a cooling device failure, and equipment is installed in stages over a long period of time. However, there are many cases where excessive operation of the cooling device is performed because there is anxiety that the temperature in the room rises by stopping the excessive cooling device. In particular, when the floor blowing method and the local cooling method are used in combination, it is difficult to determine which cooling device should be operated, and therefore, excessive operation becomes remarkable.

このような背景から、冷却装置の運転台数や送風量を最適に制御し、省エネを図る冷却装置の制御方法について様々な技術が開示されている。例えば、特許文献１には、データセンタ内に多数のノードを設置し、前記各ノードがネットワークを介して接続され、データセンタ内に設置された複数の空調機により前記各ノードを冷却するネットワークシステムにおいて、前記各ノードを冷却する空調機を記憶し、前記各ノードの給気面及び排気面の温度を検知し、前記各ノードの排気が他のノードに給気される割合を算出し、前記給気面の温度の検知により熱だまりの発生を検出した際に、前記データセンタ内の空気の流れを考慮して前記熱だまりにあるノードの給気面の温度低下に影響の大きい空調機の出力を大きくすることで熱だまりの除去を行うことを特徴とするデータセンタにおける空調管理方法が開示されている（請求項１参照）。 Against this background, various techniques have been disclosed for cooling device control methods that optimally control the number of cooling devices to be operated and the amount of air blown to save energy. For example, Patent Document 1 discloses a network system in which a large number of nodes are installed in a data center, the nodes are connected via a network, and the nodes are cooled by a plurality of air conditioners installed in the data center. Storing air conditioners that cool each of the nodes, detecting the temperature of the air supply surface and the exhaust surface of each node, calculating the rate at which the exhaust of each node is supplied to other nodes, When the occurrence of a heat accumulation is detected by detecting the temperature of the air supply surface, the air conditioner having a large influence on the temperature decrease of the air supply surface of the node in the heat accumulation is considered in consideration of the air flow in the data center. An air conditioning management method in a data center is disclosed in which heat accumulation is removed by increasing the output (see claim 1).

また、特許文献２には、ＩＴ機器を冷却する空調機器を制御する空調制御システムが行う空調制御方法であって、前記空調制御システムは、電源装置からＩＴ機器に供給されている電流値および電圧値を取得して、取得した電流値および電圧値からＩＴ機器によるエネルギー消費量を計測する機器エネルギー消費量計測ステップと、電力供給部から空調システムに供給されている電流値および電圧値を取得して、取得した電流値および電圧値から前記空調システムによるエネルギー消費量を計測するシステムエネルギー消費量計測ステップと、ＩＴ機器に取り付けられた温度センサにより検知されたセンサ値から、ＩＴ機器の吸気温度を計測する吸気温度計測ステップと、前記機器エネルギー消費量計測ステップにより計測されたＩＴ機器によるエネルギー消費量、および前記システムエネルギー消費量計測ステップにより計測された前記空調システムによるエネルギー消費量を足し合わせた総エネルギー消費量を、前記吸気温度計測ステップにより計測された吸気温度を変数とする所定の関数で近似することにより得られる特性式を用いて、総エネルギー消費量が最小となる時の吸気温度を算出する吸気温度算出ステップと、前記吸気温度算出ステップにより算出された吸気温度となるように、前記空調システムの制御値を設定する空調制御値設定ステップとを実行することを特徴とする空調制御方法が開示されている（請求項３参照）。 Patent Document 2 discloses an air conditioning control method performed by an air conditioning control system that controls an air conditioning device that cools an IT device. The air conditioning control system includes a current value and a voltage supplied from a power supply device to the IT device. Obtain the value, and acquire the current value and voltage value supplied to the air conditioning system from the power supply unit, and the equipment energy consumption measurement step to measure the energy consumption by the IT equipment from the obtained current value and voltage value The intake air temperature of the IT device is determined from the system energy consumption measurement step for measuring the energy consumption by the air conditioning system from the acquired current value and voltage value, and the sensor value detected by the temperature sensor attached to the IT device. To the IT equipment measured by the intake air temperature measurement step to be measured and the device energy consumption measurement step The total energy consumption obtained by adding the energy consumption by the air conditioning system measured in the system energy consumption measurement step and the intake air temperature measured in the intake air temperature measurement step as a variable An intake air temperature calculating step for calculating an intake air temperature when the total energy consumption is minimized, and an intake air temperature calculated by the intake air temperature calculating step using the characteristic equation obtained by approximating with the function of And an air conditioning control value setting step of setting a control value of the air conditioning system is disclosed (refer to claim 3).

特開２０１１−３９８９１号公報JP 2011-39891 A 特開２０１０−２７０９３７号公報JP 2010-270937 A

しかし、一般的にデータセンタでは室内の温熱環境を、各コールドアイルに１〜２点設置された温度センサの測定値で管理している場合が多く、特許文献１や特許文献２に開示された冷却システムを運用する場合には、各機器の吸込温度センサや排気温度センサ、電流値、電圧値を測定するための複数のセンサ設置が必要となり、イニシャルコストが高くなってしまう。特に、データセンタでは、冷却システムを管理する管理者と、機器を所有するユーザが異なる場合があり、その場合には、各機器が所有する温度情報等を空調の制御に使用できないことがあるため、空調制御用の新たなセンサの設置が必要となり、イニシャルコストが高くなる。 However, in general, the data center often manages the indoor thermal environment with the measured values of one or two temperature sensors installed in each cold aisle, which are disclosed in Patent Document 1 and Patent Document 2. When operating the cooling system, it is necessary to install a suction temperature sensor and an exhaust temperature sensor of each device, a plurality of sensors for measuring the current value and the voltage value, and the initial cost becomes high. In particular, in a data center, the administrator who manages the cooling system may be different from the user who owns the device, and in this case, the temperature information owned by each device may not be used for air conditioning control. Therefore, it is necessary to install a new sensor for air conditioning control, and the initial cost becomes high.

また、室全体を冷却する冷却装置に加え、特定のエリアの機器を局所的に冷却する局所冷却装置が設置されている場合には、局所冷却装置の運転状態によって冷却装置の最適な運転状態が変わることから、運転する最適な冷却装置を一意的に決定することができない。 In addition to the cooling device that cools the entire room, if a local cooling device that locally cools equipment in a specific area is installed, the optimal operating state of the cooling device depends on the operating state of the local cooling device. As a result, the optimum cooling device to be operated cannot be uniquely determined.

そこで、本発明は、少ない測定点数で省エネ化を実現する冷却システム、空調制御装置および空調制御方法を提供することを課題とする。 Then, this invention makes it a subject to provide the cooling system, the air-conditioning control apparatus, and air-conditioning control method which implement | achieve energy-saving by few measurement points.

このような課題を解決するために、本発明に係る冷却システムは、複数台設置された機器の給気面と排気面を揃えて配置した機器列を形成し、前記機器列の給気面同士が対向するコールドアイルおよび前記機器列の排気面同士が対向するホットアイルを形成し、前記コールドアイルと前記ホットアイルの空気の混合を抑制する間仕切りを設けた部屋において、前記ホットアイルの暖気を冷却して前記コールドアイルに冷風を供給する冷却装置と、前記ホットアイルと前記コールドアイルの差圧を測定する差圧センサと、前記冷却装置の起動または停止を行う制御装置と、を備え、前記制御装置は、前記差圧センサの測定値に応じて起動または停止を行う前記冷却装置を選択するとともに、前記差圧センサで測定した前記ホットアイルと前記コールドアイルの差圧の最大値が第１閾値よりも高い場合、差圧が最大値となる前記ホットアイルに対する前記冷却装置の優先順位を算出し、前記優先順位の高い前記冷却装置を起動すると判定し、前記ホットアイルと前記冷却装置の距離と、前記冷却装置の運転状態から、前記ホットアイルの暖気を前記冷却装置が吸込む風量割合を予め求めておいた予測式で演算し、前記風量割合の高い順に前記冷却装置の優先順位を決定することを特徴とする。その他の解決手段は発明を実施するための形態において後記する。 In order to solve such a problem, the cooling system according to the present invention forms a device row in which the air supply surface and the exhaust surface of a plurality of installed devices are aligned, and the air supply surfaces of the device rows are arranged together. The cold aisle and the exhaust aisle of the device row opposite to each other form a hot aisle that cools the hot aisle in a room provided with a partition that suppresses air mixing in the cold aisle and the hot aisle. A cooling device for supplying cold air to the cold aisle, a differential pressure sensor for measuring a differential pressure between the hot aisle and the cold aisle, and a control device for starting or stopping the cooling device, and device is configured to select the cooling device is used to start or stop depending on the measured value of the differential pressure sensor, wherein said hot aisle measured by the differential pressure sensor co When the maximum value of the differential pressure of the door aisle is higher than the first threshold value, the priority of the cooling device for the hot aisle having the maximum differential pressure is calculated, and it is determined that the cooling device with the higher priority is started. From the distance between the hot aisle and the cooling device and the operating state of the cooling device, the warm air of the hot aisle is calculated by a prediction formula that has been obtained in advance, and the air flow rate is high. The priorities of the cooling devices are sequentially determined . The other means for solving will be described later in the mode for carrying out the invention.

本発明によれば、少ない測定点数で省エネ化を実現する冷却システム、空調制御装置および空調制御方法を提供することができる。 According to the present invention, it is possible to provide a cooling system, an air conditioning control device, and an air conditioning control method that realize energy saving with a small number of measurement points.

第１実施形態に係る冷却システムの構成例を示す平面図である。It is a top view which shows the structural example of the cooling system which concerns on 1st Embodiment. 第１実施形態に係る冷却システムの構成例を示す立面図である。It is an elevation view which shows the structural example of the cooling system which concerns on 1st Embodiment. 第１実施形態に係る冷却システムの制御装置の処理を示すフローチャートである。It is a flowchart which shows the process of the control apparatus of the cooling system which concerns on 1st Embodiment. （ａ）は各冷却装置２０と各ホットアイルＨＡにおける風量の割合の関係を示す表であり、（ｂ）は優先順位の関係を示す表である。(A) is a table | surface which shows the relationship of the ratio of the air volume in each cooling device 20 and each hot aisle HA, (b) is a table | surface which shows the relationship of a priority. 第２実施形態に係る冷却システムの構成例を示す平面図である。It is a top view which shows the structural example of the cooling system which concerns on 2nd Embodiment. 第２実施形態に係る冷却システムの構成例を示す立面図である。It is an elevation view which shows the structural example of the cooling system which concerns on 2nd Embodiment.

以下、本発明を実施するための形態（以下「実施形態」という）について、適宜図面を参照しながら詳細に説明する。なお、各図において、共通する部分には同一の符号を付し重複した説明を省略する。 Hereinafter, modes for carrying out the present invention (hereinafter referred to as “embodiments”) will be described in detail with reference to the drawings as appropriate. In each figure, common portions are denoted by the same reference numerals, and redundant description is omitted.

≪第１実施形態≫
＜冷却システムＳ＞
第１施形態に係る冷却システムＳについて、図１および図２を用いて説明する。図１は、第１実施形態に係る冷却システムＳの構成例を示す平面図である。図２は、第１実施形態に係る冷却システムＳの構成例を示す立面図である。なお、図２に示す立面図においては、空気の流れる関係を理解しやすくするため、図１とは冷却装置２０の配置を変更して図示している。 << First Embodiment >>
<Cooling system S>
The cooling system S which concerns on 1st embodiment is demonstrated using FIG. 1 and FIG. FIG. 1 is a plan view illustrating a configuration example of the cooling system S according to the first embodiment. FIG. 2 is an elevation view illustrating a configuration example of the cooling system S according to the first embodiment. In the elevation view shown in FIG. 2, the arrangement of the cooling device 20 is changed from that in FIG. 1 in order to facilitate understanding of the relationship of air flow.

図１に示すように、室（コンピュータルーム，サーバルーム）Ｒには、コンピュータやサーバ等の電子機器（以下、「機器」と称する。）を収納したラック１０が複数設置されている。ラック１０は、機器が内蔵するファン（図示せず）により、前面を給気面とし、背面を排気面として、給気面から取り込んだ空気で機器の内部を冷却し、排気面から高温空気を排気するようになっている。 As shown in FIG. 1, in a room (computer room, server room) R, a plurality of racks 10 containing electronic devices such as computers and servers (hereinafter referred to as “devices”) are installed. The rack 10 uses a fan (not shown) built in the equipment to cool the inside of the equipment with air taken from the air supply surface with the front surface as the air supply surface and the back surface as the exhaust surface, and draws hot air from the exhaust surface. It is designed to exhaust.

ラック１０は、給気面と排気面を揃えて配置したラック列を形成しており、さらに、ラック列の給気面同士、排気面同士を向かい合わせて複数列配置されている。これにより、図１および図２に示すように、ラック列の給気面同士が対向するコールドアイルＣＡと、ラック列の排気面同士が対向するホットアイルＨＡと、が交互に形成される。 The rack 10 forms a rack row in which the air supply surface and the exhaust surface are aligned, and a plurality of rows are arranged with the air supply surfaces and the exhaust surfaces of the rack row facing each other. Thereby, as shown in FIGS. 1 and 2, cold aisle CA in which the air supply surfaces of the rack row face each other and hot aisle HA in which the exhaust surfaces of the rack row face each other are alternately formed.

また、図１および図２に示すように、室Ｒには、ホットアイルＨＡとコールドアイルＣＡとを仕切る間仕切り１５が設けられており、ラック１０の排気面から排気された高温空気がラック１０の給気面へと再循環することを防止する。換言すれば、ラック１０の排気面から排気された高温空気と、後述する冷却装置２０からラック１０の給気面に供給される低温空気と、が混合せず、分離するようになっている。 As shown in FIGS. 1 and 2, the chamber R is provided with a partition 15 for partitioning the hot aisle HA and the cold aisle CA, and the high-temperature air exhausted from the exhaust surface of the rack 10 is supplied to the rack 10. Prevent recirculation to the supply side. In other words, the high-temperature air exhausted from the exhaust surface of the rack 10 and the low-temperature air supplied from the cooling device 20 described later to the air supply surface of the rack 10 are not mixed and separated.

第１実施形態に係る冷却システムＳは、冷却装置２０と、差圧センサ３０と、制御装置４０と、を備えている。 The cooling system S according to the first embodiment includes a cooling device 20, a differential pressure sensor 30, and a control device 40.

冷却装置２０は、図１に示すように、室Ｒの周囲部に複数設置されている。冷却装置２０は、空調機（Computer Room Air Conditioning；ＣＲＡＣ）であり、ホットアイルＨＡからの高温空気を取り込んで冷却し、低温空気をコールドアイルＣＡに供給する。なお、冷却装置２０の運転／停止は、制御装置４０により制御される。 As shown in FIG. 1, a plurality of cooling devices 20 are installed around the chamber R. The cooling device 20 is an air conditioner (Computer Room Air Conditioning; CRAC), takes in the high-temperature air from the hot aisle HA, cools it, and supplies the low-temperature air to the cold aisle CA. The operation / stop of the cooling device 20 is controlled by the control device 40.

図２に示すように、ラック１０の排気面から排気された高温空気（暖気）は、ホットアイルＨＡに排気され、室Ｒの上部（天井裏）を通って、冷却装置２０に吸い込まれる（左下がりハッチングを付した矢印参照）。そして、冷却装置２０で冷却された低温空気（冷風）は、室Ｒの二重床空間を通って、各コールドアイルＣＡに供給され、ラック１０の給気面から吸い込まれる（白抜き矢印参照）。このように、冷却システムＳは、室Ｒに設置されたラック１０を冷却する、換言すれば、ラック１０に収納した機器（図示せず）を冷却する。 As shown in FIG. 2, the high-temperature air (warm air) exhausted from the exhaust surface of the rack 10 is exhausted to the hot aisle HA, and is sucked into the cooling device 20 through the upper part (back of the ceiling) of the chamber R (left). (See arrows with falling hatches.) And the low temperature air (cold air) cooled with the cooling device 20 is supplied to each cold aisle CA through the double floor space of the room R, and is sucked in from the air supply surface of the rack 10 (see white arrows). . In this way, the cooling system S cools the rack 10 installed in the room R, in other words, cools the equipment (not shown) housed in the rack 10.

各ホットアイルＨＡおよびコールドアイルＣＡには、差圧センサ３０が設置され、ホットアイルＨＡの圧力（静圧）とコールドアイルＣＡの圧力（静圧）との差を測定することができるようになっている。換言すれば、ラック１０の排気面（ホットアイルＨＡ）と給気面（コールドアイルＣＡ）の圧力差を測定することができるようになっている。差圧センサ３０の検出信号は、制御装置４０に出力される。 A differential pressure sensor 30 is installed in each hot aisle HA and cold aisle CA, and the difference between the pressure (static pressure) of the hot aisle HA and the pressure (static pressure) of the cold aisle CA can be measured. ing. In other words, the pressure difference between the exhaust surface (hot aisle HA) and the air supply surface (cold aisle CA) of the rack 10 can be measured. A detection signal of the differential pressure sensor 30 is output to the control device 40.

なお、図１に示す構成においては、コールドアイルＣＡは室Ｒの室内（ラック１０の側面方向の通路）で連通しているため、各コールドアイルＣＡにおける圧力はほぼ等しい。一方、ホットアイルＨＡは間仕切り１５で囲われており、各ホットアイルＨＡにおける圧力は異なることがある。このため、差圧センサ３０は各ホットアイルＨＡに対応するように設ける。 In the configuration shown in FIG. 1, since the cold aisle CA communicates with the room R (the passage in the side surface direction of the rack 10), the pressure in each cold aisle CA is substantially equal. On the other hand, the hot aisle HA is surrounded by the partition 15, and the pressure in each hot aisle HA may be different. For this reason, the differential pressure sensor 30 is provided so as to correspond to each hot aisle HA.

制御装置４０は、差圧センサ３０で検出した圧力差に基づいて、冷却装置２０の運転／停止を判定し、冷却装置２０の運転／停止を制御する。図１に示すように、制御装置４０は、差圧取得部４１と、運転状態取得部４２と、運転判定部４３と、記憶部４４と、を備えている。 The control device 40 determines the operation / stop of the cooling device 20 based on the pressure difference detected by the differential pressure sensor 30 and controls the operation / stop of the cooling device 20. As shown in FIG. 1, the control device 40 includes a differential pressure acquisition unit 41, an operation state acquisition unit 42, an operation determination unit 43, and a storage unit 44.

差圧取得部４１は、差圧センサ３０で検出したホットアイルＨＡとコールドアイルＣＡの差圧を取得する。 The differential pressure acquisition unit 41 acquires the differential pressure between the hot aisle HA and the cold aisle CA detected by the differential pressure sensor 30.

運転状態取得部４２は、現在の冷却装置２０の運転状態（どの冷却装置２０が運転しているか、停止しているか）を取得する。 The operation state acquisition unit 42 acquires the current operation state of the cooling device 20 (which cooling device 20 is operating or stopped).

運転判定部４３は、差圧取得部４１で取得した差圧情報および運転状態取得部４２で取得した現在の運転状態情報に基づいて、冷却装置２０の運転／停止を判定する。 The operation determination unit 43 determines operation / stop of the cooling device 20 based on the differential pressure information acquired by the differential pressure acquisition unit 41 and the current operation state information acquired by the operation state acquisition unit 42.

記憶部４４は、運転判定部４３が冷却装置２０の運転／停止を判定する際に用いる情報が格納されている。 The storage unit 44 stores information used when the operation determination unit 43 determines operation / stop of the cooling device 20.

そして、制御装置４０は、運転判定部４３の判定結果に基づいて、各冷却装置２０の運転／停止を制御することにより、冷却システムＳ全体を制御する。 And the control apparatus 40 controls the cooling system S whole by controlling the driving | operation / stop of each cooling device 20 based on the determination result of the driving | operation determination part 43. FIG.

＜運転判定処理＞
次に、制御装置４０の処理について、図３を用いて説明する。図３は、第１実施形態に係る冷却システムＳの制御装置４０の処理を示すフローチャートである。 <Driving judgment processing>
Next, the process of the control apparatus 40 is demonstrated using FIG. FIG. 3 is a flowchart showing processing of the control device 40 of the cooling system S according to the first embodiment.

ステップＳ１０１において、制御装置４０の差圧取得部４１は、差圧センサ３０から各ホットアイルＨＡにおけるコールドアイルＣＡとの差圧を取得する。なお、各ホットアイルＨＡ（差圧センサ３０）における差圧は「差圧ΔＰ＝（ホットアイルＨＡの圧力）−（コールドアイルＣＡの圧力）」とする。 In step S 101, the differential pressure acquisition unit 41 of the control device 40 acquires the differential pressure with respect to the cold aisle CA in each hot aisle HA from the differential pressure sensor 30. The differential pressure in each hot aisle HA (differential pressure sensor 30) is “differential pressure ΔP = (pressure of hot aisle HA) − (pressure of cold aisle CA)”.

ステップＳ１０２において、制御装置４０の運転判定部４３は、ステップＳ１０１で取得した各ホットアイルＨＡの差圧ΔＰのなかで最大のものを差圧最大値ΔＰmaxとする。なお、ホットアイルＨＡに通し番号を付け、差圧ΔＰが最大となるホットアイルＨＡの番号を（ｎ）とする。そして、運転判定部４３は、差圧最大値ΔＰmaxが予め設定された第１閾値ΔＰset1よりも大きいか否かを判定する（ΔＰmax＞ΔＰset1？）。なお、第１閾値ΔＰset1は、ホットアイルＨＡからコールドアイルＣＡへの空気の流入（逆流）を判定するための閾値であり、第１閾値ΔＰset1＝０としてもよく、その他の値を用いてもよい。差圧最大値ΔＰmaxが第１閾値ΔＰset1よりも大きい場合（Ｓ１０２・Ｙｅｓ）、制御装置４０の処理はステップＳ１０３に進む。一方、差圧最大値ΔＰmaxが第１閾値ΔＰset1よりも大きくない場合（Ｓ１０２・Ｎｏ）、制御装置４０の処理はステップＳ１０６に進む。 In step S102, the operation determination unit 43 of the control device 40 sets the maximum differential pressure ΔP of each hot aisle HA acquired in step S101 as the differential pressure maximum value ΔPmax. A serial number is assigned to the hot aisle HA, and the number of the hot aisle HA at which the differential pressure ΔP is maximum is (n). Then, the operation determination unit 43 determines whether or not the differential pressure maximum value ΔPmax is larger than a preset first threshold value ΔPset1 (ΔPmax> ΔPset1?). The first threshold value ΔPset1 is a threshold value for determining the inflow (reverse flow) of air from the hot aisle HA to the cold aisle CA, and may be set to the first threshold value ΔPset1 = 0 or other values may be used. . When the differential pressure maximum value ΔPmax is larger than the first threshold value ΔPset1 (S102 / Yes), the process of the control device 40 proceeds to step S103. On the other hand, when the differential pressure maximum value ΔPmax is not greater than the first threshold value ΔPset1 (S102, No), the process of the control device 40 proceeds to step S106.

ここで、差圧ΔＰ＞０となると、即ち、ホットアイルＨＡの圧力がコールドアイルＣＡの圧力よりも高くなると、ホットアイルＨＡの空気（高温空気）がコールドアイルＣＡへ流入しラック１０の給気面に吸い込まれることにより、吸込温度が上昇してしまうおそれがある。このため、第１閾値ΔＰset1＝０と設定することにより、ホットアイルＨＡの空気（高温空気）がコールドアイルＣＡへ流入するか否かを判定する。なお、マージンを設けて、第１閾値ΔＰset１を０未満（ΔＰset１＜０）で設定してもよい。また、ホットアイルＨＡからコールドアイルＣＡへの逆流が許容できる範囲で第１閾値ΔＰset１を０よりも大きく（ΔＰset１＞０）設定してもよい。 Here, when the differential pressure ΔP> 0, that is, when the pressure of the hot aisle HA becomes higher than the pressure of the cold aisle CA, the air (hot air) of the hot aisle HA flows into the cold aisle CA and is supplied to the rack 10. The suction temperature may rise by being sucked into the surface. Therefore, by setting the first threshold value ΔPset1 = 0, it is determined whether the air (hot air) of the hot aisle HA flows into the cold aisle CA. In addition, a margin may be provided and the first threshold value ΔPset1 may be set to be less than 0 (ΔPset1 <0). Further, the first threshold value ΔPset1 may be set to be larger than 0 (ΔPset1> 0) within a range in which the backflow from the hot aisle HA to the cold aisle CA is allowed.

ステップＳ１０３において、制御装置４０の運転状態取得部４２は、冷却装置２０の運転状態を取得する。そして、制御装置４０の運転判定部４３は、停止している冷却装置２０のそれぞれについて差圧ΔＰが最大（差圧最大値ΔＰmax）となるホットアイルＨＡ（ｎ）から各冷却装置２０が吸込む風量の寄与率を計算する。なお、寄与率の計算方法については、後述する。 In step S 103, the operation state acquisition unit 42 of the control device 40 acquires the operation state of the cooling device 20. The operation determination unit 43 of the control device 40 then takes the air volume that each cooling device 20 sucks from the hot aisle HA (n) at which the differential pressure ΔP becomes maximum (differential pressure maximum value ΔPmax) for each of the stopped cooling devices 20. Calculate the contribution rate. The contribution rate calculation method will be described later.

ステップＳ１０４において、制御装置４０の運転判定部４３は、停止している冷却装置２０のうち、ホットアイルＨＡ（ｎ）への寄与率が最も高い冷却装置２０を選定する。 In step S104, the operation determination unit 43 of the control device 40 selects the cooling device 20 having the highest contribution rate to the hot aisle HA (n) among the stopped cooling devices 20.

ステップＳ１０５において、制御装置４０は、ステップＳ１０４で選定した冷却装置２０を起動する。また、制御装置４０は、起動した冷却装置２０の番号を記憶部４４に記憶する。そして、制御装置４０の処理はステップＳ１０１に戻る。 In step S105, the control device 40 activates the cooling device 20 selected in step S104. Further, the control device 40 stores the number of the activated cooling device 20 in the storage unit 44. And the process of the control apparatus 40 returns to step S101.

ステップＳ１０６において、制御装置４０の運転判定部４３は、ステップＳ１０１で取得した各ホットアイルＨＡの差圧ΔＰのなかで最小のものを差圧最小値ΔＰminとする。なお、差圧ΔＰが最小となるホットアイルＨＡの番号を（ｍ）とする。そして、運転判定部４３は、差圧最小値ΔＰminが予め設定された第２閾値ΔＰset2よりも小さいか否かを判定する（ΔＰmin＜ΔＰset2？）。なお、第２閾値ΔＰset2は、冷却装置２０の運転が過剰であるか否かを判定するための閾値であり、第１閾値ΔＰset1よりも小さな値であり、基本的には第２閾値ΔＰset2は負の値となる（ΔＰset2＜０）。差圧最小値ΔＰminが第２閾値ΔＰset2よりも小さい場合（Ｓ１０６・Ｙｅｓ）、制御装置４０の処理はステップＳ１０７に進む。一方、差圧最小値ΔＰminが第２閾値ΔＰset2よりも小さくない場合（Ｓ１０６・Ｎｏ）、制御装置４０の処理はステップＳ１０１に戻る。 In step S106, the operation determination unit 43 of the control device 40 sets the smallest differential pressure ΔP of each hot aisle HA acquired in step S101 as the differential pressure minimum value ΔPmin. The number of the hot aisle HA that minimizes the differential pressure ΔP is (m). Then, the operation determination unit 43 determines whether or not the minimum differential pressure value ΔPmin is smaller than a preset second threshold value ΔPset2 (ΔPmin <ΔPset2?). The second threshold value ΔPset2 is a threshold value for determining whether the operation of the cooling device 20 is excessive, and is a value smaller than the first threshold value ΔPset1, and basically the second threshold value ΔPset2 is negative. (ΔPset2 <0). When the differential pressure minimum value ΔPmin is smaller than the second threshold value ΔPset2 (S106 / Yes), the process of the control device 40 proceeds to step S107. On the other hand, when the differential pressure minimum value ΔPmin is not smaller than the second threshold value ΔPset2 (No in S106), the process of the control device 40 returns to Step S101.

ステップＳ１０７において、制御装置４０の運転状態取得部４２は、冷却装置２０の運転状態を取得する。そして、制御装置４０の運転判定部４３は、運転している冷却装置２０のそれぞれについて差圧ΔＰが最小（差圧最小値ΔＰmin）となるホットアイルＨＡ（ｍ）から各冷却装置２０が吸込む風量の寄与率を算出する。なお、寄与率の計算方法については、後述する。 In step S 107, the operation state acquisition unit 42 of the control device 40 acquires the operation state of the cooling device 20. The operation determination unit 43 of the control device 40 then takes the air volume that each cooling device 20 sucks from the hot aisle HA (m) where the differential pressure ΔP is minimum (differential pressure minimum value ΔPmin) for each of the cooling devices 20 that is operating. To calculate the contribution rate. The contribution rate calculation method will be described later.

ステップＳ１０８において、制御装置４０の運転判定部４３は、運転している冷却装置２０のうち、ホットアイルＨＡ（ｍ）への寄与率が最も高い冷却装置２０を選定する。 In step S108, the operation determination unit 43 of the control device 40 selects the cooling device 20 having the highest contribution rate to the hot aisle HA (m) among the cooling devices 20 that are operating.

ステップＳ１０９において、制御装置４０の運転判定部４３は、ステップＳ１０８で選定した冷却装置２０が前回起動した冷却装置２０であるか否かを判定する。ちなみに、前回起動した冷却装置２０の番号は記憶部４４に記憶されている。選定した冷却装置２０が前回起動した冷却装置２０である場合（Ｓ１０９・Ｙｅｓ）、冷却装置２０の選定を取り消して、制御装置４０の処理はステップＳ１０１に戻る。一方、選定した冷却装置２０が前回起動した冷却装置２０でない場合（Ｓ１０９・Ｎｏ）、制御装置４０の処理はステップＳ１１０に進む。 In step S109, the operation determination unit 43 of the control device 40 determines whether or not the cooling device 20 selected in step S108 is the cooling device 20 activated last time. Incidentally, the number of the cooling device 20 activated last time is stored in the storage unit 44. When the selected cooling device 20 is the cooling device 20 activated last time (S109 / Yes), the selection of the cooling device 20 is canceled and the processing of the control device 40 returns to step S101. On the other hand, when the selected cooling device 20 is not the cooling device 20 activated last time (S109 · No), the processing of the control device 40 proceeds to step S110.

ステップＳ１１０において、制御装置４０は、ステップＳ１０８で選定した冷却装置２０を停止する。そして、制御装置４０の処理はステップＳ１０１に戻る。 In step S110, the control device 40 stops the cooling device 20 selected in step S108. And the process of the control apparatus 40 returns to step S101.

＜寄与率の計算＞
次に、ステップＳ１０３における寄与率の計算およびステップＳ１０４における冷却装置２０の選定について、図４を用いて説明する。図４（ａ）は、各冷却装置２０と各ホットアイルＨＡにおける風量の割合の関係を示す表であり、図４（ｂ）は、優先順位の関係を示す表である。 <Calculation of contribution rate>
Next, calculation of the contribution rate in step S103 and selection of the cooling device 20 in step S104 will be described with reference to FIG. FIG. 4A is a table showing the relationship between the air volume ratios in each cooling device 20 and each hot aisle HA, and FIG. 4B is a table showing the priority relationship.

ホットアイルＨＡの差圧測定値に応じて冷却装置２０の運転を行う際に、対象となるホットアイルＨＡに対して、冷却装置２０が吸込む風量の寄与率が最も高い冷却装置２０を選定するため、予めホットアイルＨＡや冷却装置２０のレイアウト、仕様を基にしたシミュレーションを行い、様々な冷却装置２０の運転状態（運転／停止）の組み合わせに対して、各ホットアイルＨＡから各冷却装置２０に吸い込まれる風量の割合（寄与率）を算出する近似式を求めておき、記憶部４４に格納しておく。そして、各冷却装置２０とホットアイルＨＡの位置関係（距離）、および、各冷却装置２０の運転状態から冷却装置２０の寄与率を算定する近似式を用いて各冷却装置２０の寄与率を算出する。 When operating the cooling device 20 according to the measured differential pressure value of the hot aisle HA, in order to select the cooling device 20 having the highest contribution ratio of the air volume sucked by the cooling device 20 to the target hot aisle HA. First, a simulation based on the layout and specifications of the hot aisle HA and the cooling device 20 is performed in advance, and from each hot aisle HA to each cooling device 20 for various combinations of operation states (operation / stop) of the cooling device 20. An approximate expression for calculating the ratio (contribution rate) of the sucked air volume is obtained and stored in the storage unit 44. Then, the contribution rate of each cooling device 20 is calculated using an approximate expression that calculates the contribution rate of the cooling device 20 from the positional relationship (distance) between each cooling device 20 and the hot aisle HA and the operating state of each cooling device 20. To do.

図４（ａ）において、現在の各冷却装置２０の運転状態から、現在停止している冷却装置（１）を起動（運転）した場合、冷却装置（１）の吸込口に吸い込まれる高温空気の風量の割合は、ホットアイル（１）からが６０％、ホットアイル（２）からが２５％、ホットアイル（３）からが１０％、…、であることを示している。同様に、現在の各冷却装置２０の運転状態から、現在停止している冷却装置（２）を起動（運転）した場合、冷却装置（２）の吸込口に吸い込まれる高温空気の風量の割合は、ホットアイル（１）からが２０％、ホットアイル（２）からが５０％、ホットアイル（３）からが２０％、…、であることを示している。また、現在の各冷却装置２０の運転状態から、現在停止している冷却装置（３）を起動（運転）した場合、冷却装置（３）の吸込口に吸い込まれる高温空気の風量の割合は、ホットアイル（１）からが１０％、ホットアイル（２）からが１５％、ホットアイル（３）からが５０％、…、であることを示している。 In FIG. 4A, when the currently stopped cooling device (1) is started (operated) from the current operating state of each cooling device 20, the high-temperature air sucked into the suction port of the cooling device (1) The ratio of the air volume is 60% from the hot aisle (1), 25% from the hot aisle (2), 10% from the hot aisle (3), and so on. Similarly, when the currently stopped cooling device (2) is started (operated) from the current operating state of each cooling device 20, the ratio of the air volume of the hot air sucked into the suction port of the cooling device (2) is , 20% from hot aisle (1), 50% from hot aisle (2), 20% from hot aisle (3), and so on. In addition, when the currently stopped cooling device (3) is started (operated) from the current operating state of each cooling device 20, the ratio of the air volume of the high-temperature air sucked into the suction port of the cooling device (3) is: 10% from the hot aisle (1), 15% from the hot aisle (2), 50% from the hot aisle (3), and so on.

図４（ａ）に示す各冷却装置２０と各ホットアイルＨＡにおける風量の割合（寄与率）の関係に基づいて、各ホットアイルＨＡについて、寄与率の高い順に番号（優先順位）を付与する。 Numbers (priorities) are assigned to each hot aisle HA in descending order of contribution based on the relationship between the cooling device 20 shown in FIG. 4A and the air volume ratio (contribution rate) in each hot aisle HA.

図４（ｂ）に示すように、ホットアイル（１）において、冷却装置（１）に「１」が付与され、冷却装置（２）に「２」が付与され、冷却装置（３）に「３」が付与される。同様に、ホットアイル（２）において、冷却装置（２）に「１」が付与され、冷却装置（１）に「２」が付与され、冷却装置（３）に「３」が付与される。また、ホットアイル（３）において、冷却装置（３）に「１」が付与され、冷却装置（２）に「２」が付与され、冷却装置（１）に「３」が付与される。 As shown in FIG. 4B, in the hot aisle (1), “1” is given to the cooling device (1), “2” is given to the cooling device (2), and “1” is given to the cooling device (3). 3 "is given. Similarly, in the hot aisle (2), “1” is given to the cooling device (2), “2” is given to the cooling device (1), and “3” is given to the cooling device (3). In the hot aisle (3), “1” is given to the cooling device (3), “2” is given to the cooling device (2), and “3” is given to the cooling device (1).

差圧ΔＰが最大（差圧最大値ΔＰmax）となるホットアイルＨＡ（ｎ）がホットアイル（１）だった場合、冷却装置（１）が選定される。また、ホットアイルＨＡ（ｎ）がホットアイル（２）だった場合、冷却装置（２）が選定される。また、ホットアイルＨＡ（ｎ）がホットアイル（３）だった場合、冷却装置（３）が選定される。 When the hot aisle HA (n) at which the differential pressure ΔP is maximum (differential pressure maximum value ΔPmax) is the hot aisle (1), the cooling device (1) is selected. Further, when the hot aisle HA (n) is the hot aisle (2), the cooling device (2) is selected. Further, when the hot aisle HA (n) is the hot aisle (3), the cooling device (3) is selected.

次に、ステップＳ１０７における寄与率の計算およびステップＳ１０８における冷却装置２０の選定について、同様に図４を用いて説明する。 Next, calculation of the contribution rate in step S107 and selection of the cooling device 20 in step S108 will be described with reference to FIG.

ホットアイルＨＡの差圧測定値に応じて冷却装置２０の停止を行う際に、対象となるホットアイルＨＡに対して、冷却装置２０が吸込む風量の寄与率が最も高い冷却装置２０を選定するため、各冷却装置２０とホットアイルＨＡの位置関係（距離）、および、各冷却装置２０の運転状態から冷却装置２０の寄与率を算定する近似式を用いて各冷却装置２０の寄与率を算出する。 When the cooling device 20 is stopped according to the measured differential pressure of the hot aisle HA, in order to select the cooling device 20 having the highest contribution ratio of the air volume sucked by the cooling device 20 to the target hot aisle HA. The contribution rate of each cooling device 20 is calculated using an approximate expression for calculating the contribution rate of the cooling device 20 from the positional relationship (distance) between each cooling device 20 and the hot aisle HA and the operating state of each cooling device 20. .

図４（ａ）において、前記のとおり現在の各冷却装置２０の運転状態から、現在運転している冷却装置（１）の吸込口に吸い込まれる高温空気の風量の割合は、ホットアイル（１）からが６０％、ホットアイル（２）からが２５％、ホットアイル（３）からが１０％、…、であることを示している。同様に、現在の各冷却装置２０の運転状態から、現在運転している冷却装置（２）の吸込口に吸い込まれる高温空気の風量の割合は、ホットアイル（１）からが２０％、ホットアイル（２）からが５０％、ホットアイル（３）からが２０％、…、であることを示している。また、現在の各冷却装置２０の運転状態から、現在運転している冷却装置（３）の吸込口に吸い込まれる高温空気の風量の割合は、ホットアイル（１）からが１０％、ホットアイル（２）からが１５％、ホットアイル（３）からが５０％、…、であることを示している。 In FIG. 4A, as described above, the ratio of the air volume of the hot air sucked into the suction port of the currently operating cooling device (1) from the current operating state of each cooling device 20 is the hot aisle (1). It is shown that from 60%, from hot aisle (2) is 25%, from hot aisle (3) is 10%, and so on. Similarly, from the current operating state of each cooling device 20, the ratio of the amount of hot air sucked into the suction port of the currently operating cooling device (2) is 20% from hot aisle (1). It is shown that 50% is from (2), 20% is from hot aisle (3), and so on. Moreover, the ratio of the air volume of the high-temperature air sucked into the suction port of the cooling device (3) currently operated from the current operating state of each cooling device 20 is 10% from the hot aisle (1), 2) from 15%, hot aisle (3) from 50%,...

ステップＳ１０３の処理と同様、ステップＳ１０7の処理でも図４（ａ）に示す各冷却装置２０と各ホットアイルＨＡにおける風量の割合（寄与率）の関係に基づいて、各ホットアイルＨＡについて、寄与率の高い順に番号（優先順位）を付与する。 Similar to the processing in step S103, the contribution rate for each hot aisle HA is also determined in step S107 based on the relationship between the ratio (contribution rate) of the air volume in each cooling device 20 and each hot aisle HA shown in FIG. Numbers (priority order) are assigned in descending order.

差圧ΔＰが最小（差圧最小値ΔＰmin）となるホットアイルＨＡ（ｍ）がホットアイル（１）だった場合、冷却装置（１）が選定される。また、ホットアイルＨＡ（ｍ）がホットアイル（２）だった場合、冷却装置（２）が選定される。また、ホットアイルＨＡ（ｍ）がホットアイル（３）だった場合、冷却装置（３）が選定される。 When the hot aisle HA (m) at which the differential pressure ΔP is minimum (differential pressure minimum value ΔPmin) is the hot aisle (1), the cooling device (1) is selected. Further, when the hot aisle HA (m) is the hot aisle (2), the cooling device (2) is selected. When the hot aisle HA (m) is the hot aisle (3), the cooling device (3) is selected.

図４（ａ）に示す各寄与率は、前述のステップＳ１０３の処理のときのように、各冷却装置２０とホットアイルＨＡの位置関係（距離）、および、各冷却装置２０の運転状態（運転／停止）から近似式を用いて算出する。そして、図４（ｂ）に示すように、算出した寄与率の高い順に優先順位を付与して冷却装置２０の運転／停止を行う。これにより、様々な冷却装置２０の運転状態に対して、複雑な計算を行わなくても、好適な冷却装置２０を選定することができる。 Each contribution rate shown in FIG. 4A is the positional relationship (distance) between each cooling device 20 and the hot aisle HA and the operating state (operation) of each cooling device 20 as in the process of step S103 described above. / Stop) using an approximate expression. Then, as shown in FIG. 4B, the cooling apparatus 20 is operated / stopped by assigning priorities in descending order of the calculated contribution rate. As a result, a suitable cooling device 20 can be selected without performing complicated calculations for various operating states of the cooling device 20.

また、図４（ａ）に示す各寄与率のテーブルは、各冷却装置２０とホットアイルＨＡの位置関係、および、各冷却装置２０の運転状態（運転／停止）から求めることができるので、各冷却装置２０の運転状態（運転／停止）の組み合わせごとのテーブルを記憶部４４に記憶しておいてもよい。これにより、制御装置４０で計算を行わなくとも冷却装置２０の寄与率を求め、寄与率の高い冷却装置２０を選定することができる。 Moreover, since the table of each contribution rate shown to Fig.4 (a) can be calculated | required from the positional relationship of each cooling device 20 and hot aisle HA, and the operating state (operation / stop) of each cooling device 20, each A table for each combination of operation states (operation / stop) of the cooling device 20 may be stored in the storage unit 44. Thereby, even if it does not calculate with the control apparatus 40, the contribution rate of the cooling device 20 can be calculated | required, and the cooling device 20 with a high contribution rate can be selected.

＜作用効果＞
このように、第１実施形態に係る冷却システムＳの制御装置４０は、差圧最大値ΔＰmaxが第１閾値ΔＰset1よりも大きいと判定すると、換言すれば、ホットアイルＨＡの圧力がコールドアイルＣＡの圧力＋第１閾値ΔＰset1よりも大きくなると、冷却装置２０の運転台数を増加する（Ｓ１０２・Ｙｅｓ…Ｓ１０５参照）。これにより、ホットアイルＨＡの空気（高温空気）がコールドアイルＣＡへ流入することを防止することができる。 <Effect>
As described above, when the control device 40 of the cooling system S according to the first embodiment determines that the differential pressure maximum value ΔPmax is larger than the first threshold value ΔPset1, in other words, the pressure of the hot aisle HA is that of the cold aisle CA. When it becomes larger than the pressure + first threshold value ΔPset1, the number of operating cooling devices 20 is increased (see S102, Yes, S105). Thereby, the air (hot air) of hot aisle HA can be prevented from flowing into cold aisle CA.

この際、対象とするホットアイルＨＡ（ｎ）から各冷却装置２０が吸込む風量の寄与率を計算して、その寄与率に基づいて起動する冷却装置２０を選択するので（Ｓ１０３，Ｓ１０４参照）、対象とするホットアイルＨＡ（ｎ）を効率よく冷却する冷却装置２０を選択する、換言すれば、対象とするホットアイルＨＡ（ｎ）の圧力を効率よく下げる冷却装置２０を選択することができるので、冷却装置２０の運転台数の増加数を抑制して、冷却システムＳのシステム効率を向上させることができる。 At this time, the contribution rate of the air volume sucked by each cooling device 20 is calculated from the target hot aisle HA (n), and the cooling device 20 to be activated is selected based on the contribution rate (see S103 and S104). Since the cooling device 20 that efficiently cools the target hot aisle HA (n) is selected, in other words, the cooling device 20 that efficiently reduces the pressure of the target hot aisle HA (n) can be selected. The system efficiency of the cooling system S can be improved by suppressing the increase in the number of operating cooling devices 20.

また、第１実施形態に係る冷却システムＳの制御装置４０は、差圧最小値ΔＰminが第２閾値ΔＰset2よりも小さいと判定すると、換言すれば、ホットアイルＨＡの圧力がコールドアイルＣＡの圧力＋第２閾値ΔＰset2よりも小さくなると、ホットアイルＨＡの圧力がコールドアイルＣＡの圧力よりも十分に小さく冷却装置２０が過剰に運転しているとして、冷却装置２０の運転台数を減少する（Ｓ１０６・Ｙｅｓ…Ｓ１１０参照）。これにより、過剰に運転している冷却装置２０を停止させて、冷却システムＳのシステム効率を向上させることができる。 Further, when the control device 40 of the cooling system S according to the first embodiment determines that the differential pressure minimum value ΔPmin is smaller than the second threshold value ΔPset2, in other words, the pressure of the hot aisle HA is equal to the pressure of the cold aisle CA + If the pressure is smaller than the second threshold value ΔPset2, the number of operating cooling devices 20 is decreased because the pressure of the hot aisle HA is sufficiently smaller than the pressure of the cold aisle CA and the cooling device 20 is operating excessively (Yes in S106). ... See S110). Thereby, the cooling device 20 operating excessively can be stopped, and the system efficiency of the cooling system S can be improved.

この際、対象とするホットアイルＨＡ（ｍ）から各冷却装置２０が吸込む風量の寄与率を計算して、その寄与率に基づいて停止する冷却装置２０を選択するので（Ｓ１０７，Ｓ１０８参照）、対象とするホットアイルＨＡ（ｍ）の圧力を効率よく下げる冷却装置２０を選択する、換言すれば、他のホットアイルＨＡ（ｍ以外）の冷却に与える影響の少ない冷却装置２０を選択することができるので、他のホットアイルＨＡ（ｍ以外）の冷却に与える影響を抑えつつ、過剰に運転している冷却装置２０を停止することができる。 At this time, the contribution rate of the air volume sucked by each cooling device 20 is calculated from the target hot aisle HA (m), and the cooling device 20 to be stopped is selected based on the contribution rate (see S107 and S108). The cooling device 20 that efficiently reduces the pressure of the target hot aisle HA (m) is selected, in other words, the cooling device 20 that has little influence on the cooling of the other hot aisle HA (other than m) is selected. Therefore, the cooling device 20 that is operating excessively can be stopped while suppressing the influence on cooling of other hot aisle HA (other than m).

また、停止させるように選定した冷却装置２０が前回起動させた冷却装置２０である場合には（Ｓ１０９・Ｙｅｓ参照）、この冷却装置２０を停止させると冷却能力に不足が生じるおそれがあるため、選定した冷却装置２０の選定を取り消して、冷却装置２０を停止させず運転を継続する。これにより、当該冷却装置２０の発停を繰り返すことを防止することができる。 In addition, when the cooling device 20 selected to be stopped is the cooling device 20 that was activated last time (see S109 / Yes), if the cooling device 20 is stopped, the cooling capacity may be insufficient. The selection of the selected cooling device 20 is canceled and the operation is continued without stopping the cooling device 20. Thereby, it is possible to prevent the start and stop of the cooling device 20 from being repeated.

また、第１実施形態に係る冷却システムＳは、各ホットイアイルＨＡごとに差圧センサ３０を設けることにより達成できるので、特許文献１，２に開示された冷却システムと比較して、センサの数を削減することができ、イニシャルコストを下げることができる。 Moreover, since the cooling system S according to the first embodiment can be achieved by providing the differential pressure sensor 30 for each hot air HA, compared to the cooling system disclosed in Patent Documents 1 and 2, The number can be reduced and the initial cost can be reduced.

また、図４に示すように、寄与率の高い順に優先順位を付けて冷却装置２０の運転および停止を行うので、様々な運転状態に対して、複雑な計算を行わなくても好適な冷却装置２０を選定することができる。 Moreover, as shown in FIG. 4, since the cooling apparatus 20 is operated and stopped in order of decreasing contribution rate, the cooling apparatus suitable for various operation states without performing complicated calculations. 20 can be selected.

≪第２実施形態≫
＜冷却システムＳＡ＞
第２施形態に係る冷却システムＳＡについて、図５および図６を用いて説明する。図５は、第２実施形態に係る冷却システムＳＡの構成例を示す平面図である。図６は、第２実施形態に係る冷却システムＳＡの構成例を示す立面図である。ここで、第２実施形態に係る冷却システムＳＡ（図５，６参照）は、第１実施形態に係る冷却システムＳ（図１，２参照）と比較して、局所冷却装置２５を備える点で異なっている。その他の構成は、第１実施形態に係る冷却システムＳと同様であり重複する説明を省略する。 << Second Embodiment >>
<Cooling system SA>
The cooling system SA according to the second embodiment will be described with reference to FIGS. FIG. 5 is a plan view illustrating a configuration example of the cooling system SA according to the second embodiment. FIG. 6 is an elevation view illustrating a configuration example of the cooling system SA according to the second embodiment. Here, the cooling system SA (see FIGS. 5 and 6) according to the second embodiment is provided with a local cooling device 25 as compared with the cooling system S (see FIGS. 1 and 2) according to the first embodiment. Is different. Other configurations are the same as those of the cooling system S according to the first embodiment, and redundant description is omitted.

第２実施形態に係る冷却システムＳＡは、冷却装置２０と、局所冷却装置２５と、差圧センサ３０と、制御装置４０Ａと、を備えている。 The cooling system SA according to the second embodiment includes a cooling device 20, a local cooling device 25, a differential pressure sensor 30, and a control device 40A.

前述のように、冷却装置２０は、室Ｒの上部（天井裏）を介して複数のホットアイルＨＡから高温空気を吸い込んで、室Ｒの二重床空間を介して複数のコールドアイルＣＡに低温空気を供給する。これに対し、局所冷却装置２５は、ラック１０に設置された機器の近傍に設置され、機器の発熱を局所的に冷却する。即ち、局所冷却装置２５は、冷却対象のラック１０の排気面と接したホットアイルＨＡから高温空気を取り込んで冷却し、低温空気を冷却対象のラック１０の給気面と接したコールドアイルＣＡに供給する。 As described above, the cooling device 20 sucks high-temperature air from the plurality of hot aisles HA through the upper portion (back of the ceiling) of the room R and cools the plurality of cold aisles CA through the double floor space of the room R. Supply air. On the other hand, the local cooling device 25 is installed in the vicinity of the equipment installed in the rack 10 and locally cools the heat generated by the equipment. That is, the local cooling device 25 takes high temperature air from the hot aisle HA in contact with the exhaust surface of the rack 10 to be cooled and cools the low temperature air to the cold aisle CA in contact with the air supply surface of the rack 10 to be cooled. Supply.

なお、図５および図６において、局所冷却装置２５は一部のラック列に配置されているものとして図示しているが、これに限られるものではなく、全てのラック列に局所冷却装置２５を配置してもよい。 5 and 6, the local cooling device 25 is illustrated as being arranged in a part of the rack rows. However, the present invention is not limited to this, and the local cooling devices 25 are provided in all the rack rows. You may arrange.

制御装置４０Ａは、差圧センサ３０で検出した圧力差に基づいて、冷却装置２０の運転／停止を判定し、冷却装置２０の運転／停止を制御する。図５に示すように、制御装置４０は、差圧取得部４１と、運転状態取得部４２Ａと、運転判定部４３Ａと、記憶部４４と、を備えている。 The control device 40A determines the operation / stop of the cooling device 20 based on the pressure difference detected by the differential pressure sensor 30, and controls the operation / stop of the cooling device 20. As illustrated in FIG. 5, the control device 40 includes a differential pressure acquisition unit 41, an operation state acquisition unit 42 A, an operation determination unit 43 A, and a storage unit 44.

運転状態取得部４２Ａは、現在の冷却装置２０の運転状態（どの冷却装置２０が運転しているか、停止しているか）と、現在の局所冷却装置２５どの局所冷却装置２５が運転しているか、停止しているか）の運転状態を取得する。 42 A of driving | running state acquisition parts are the driving | running state of the present cooling device 20 (which cooling device 20 is drive | operating, has stopped), the current local cooling device 25 which local cooling device 25 is operating, The operation status is acquired.

運転判定部４３Ａは、差圧取得部４１で取得した差圧情報および運転状態取得部４２Ａで取得した現在の運転状態情報に基づいて、冷却装置２０の運転／停止を判定する。 The operation determination unit 43A determines operation / stop of the cooling device 20 based on the differential pressure information acquired by the differential pressure acquisition unit 41 and the current operation state information acquired by the operation state acquisition unit 42A.

そして、制御装置４０Ａは、運転判定部４３Ａの判定結果に基づいて、各冷却装置２０の運転／停止を制御することにより、冷却システムＳ全体を制御する。 Then, the control device 40A controls the entire cooling system S by controlling the operation / stop of each cooling device 20 based on the determination result of the operation determination unit 43A.

制御装置４０Ａの処理は、第１実施形態に係る冷却システムＳの制御装置４０の処理（図３参照）と同様である。但し、ステップＳ１０３およびステップＳ１０７で寄与率計算する際、運転している局所冷却装置２５を考慮する点で異なっている。即ち、各冷却装置２０とホットアイルＨＡの位置関係（距離）、各局所冷却装置２５とホットアイルＨＡの位置関係（距離）、各冷却装置２０の運転状態、および、各局所冷却装置２５の運転状態から冷却装置２０の寄与率を算定する近似式を用いて各冷却装置２０の寄与率を算出する。 The process of the control device 40A is the same as the process (see FIG. 3) of the control device 40 of the cooling system S according to the first embodiment. However, it differs in that the operating local cooling device 25 is taken into consideration when calculating the contribution rate in step S103 and step S107. That is, the positional relationship (distance) between each cooling device 20 and hot aisle HA, the positional relationship (distance) between each local cooling device 25 and hot aisle HA, the operating state of each cooling device 20, and the operation of each local cooling device 25 The contribution rate of each cooling device 20 is calculated using an approximate expression for calculating the contribution rate of the cooling device 20 from the state.

＜作用効果＞
このように、第２実施形態に係る冷却システムＳＡによれば、局所冷却装置２５を備える構成においても第１実施形態に係る冷却システムＳと同様にシステム効率のよい冷却装置２０の台数制御が可能となる。 <Effect>
Thus, according to the cooling system SA according to the second embodiment, even in the configuration including the local cooling device 25, the number of cooling devices 20 with high system efficiency can be controlled in the same manner as the cooling system S according to the first embodiment. It becomes.

また、制御装置４０は、局所冷却装置２５の運転／停止を行わず、冷却装置２０の運転／停止を行うようになっている。これにより、消費電力の大きい冷却装置２０を台数制御することにより、システム効率が向上する。 Further, the control device 40 does not operate / stop the local cooling device 25 but operates / stops the cooling device 20. Thereby, system efficiency improves by controlling the number of the cooling devices 20 with large power consumption.

≪変形例≫
なお、本実施形態に係る冷却システムＳ，ＳＡは、上記実施形態の構成に限定されるものではなく、発明の趣旨を逸脱しない範囲内で種々の変更が可能である。 ≪Modification≫
The cooling systems S and SA according to the present embodiment are not limited to the configuration of the above embodiment, and various modifications can be made without departing from the spirit of the invention.

本実施形態（第１，２実施形態）に係る冷却システムＳ，ＳＡが備える冷却装置２０の台数や配置位置は、図１，図５に示す台数や配置位置に限定されるものではない。また、冷却装置２０は室内Ｒに設置されているものとして説明したが、これに限られるものではなく、ホットアイルＨＡから高温空気を取り込む風路と、コールドアイルＣＡに低温空気を供給する風路と、を設け、冷却装置２０を室Ｒの外（機械室）に設置してもよい。 The number and arrangement positions of the cooling devices 20 included in the cooling systems S and SA according to the present embodiment (first and second embodiments) are not limited to the number and arrangement positions shown in FIGS. Further, the cooling device 20 has been described as being installed in the room R. However, the cooling device 20 is not limited to this, and an air path that takes in high-temperature air from the hot aisle HA and an air path that supplies low-temperature air to the cold aisle CA. And the cooling device 20 may be installed outside the room R (machine room).

制御装置４０は、冷却装置２０の運転の判定および制御を行うものとして説明したが、これに限定されるものではない。４１〜４３および判定結果を表示する表示装置（図示せず）を備える運転判定装置として、表示された判定結果に基づいて、運転者が冷却装置２０の運転／停止を操作する構成であってもよい。 The control device 40 has been described as performing the determination and control of the operation of the cooling device 20, but is not limited thereto. Even if it is the structure which a driver | operator operates / stops the cooling device 20 based on the displayed determination result as a driving | running determination apparatus provided with the display apparatus (not shown) which displays 41-43 and a determination result Good.

Ｓ，ＳＡ冷却システム
１０ラック（機器）
１５間仕切り
２０冷却装置
２５局所冷却装置
３０差圧センサ
４０，４０Ａ制御装置
４１差圧取得部
４２，４２Ａ運転状態取得部
４３，４３Ａ運転判定部
４４記憶部
ＨＡホットアイル
ＣＡコールドアイル
Ｒ室（部屋） S, SA Cooling system 10 rack (equipment)
15 partition 20 cooling device 25 local cooling device 30 differential pressure sensor 40, 40A control device 41 differential pressure acquisition unit 42, 42A operation state acquisition unit 43, 43A operation determination unit 44 storage unit HA hot aisle CA cold aisle R room (room)

Claims

A hot aisle that forms a device row in which the air supply surfaces and exhaust surfaces of devices installed in a plurality of units are aligned, and in which the air supply surfaces of the device rows face each other and the exhaust surfaces of the device rows face each other In a room provided with a partition that suppresses mixing of air in the cold aisle and the hot aisle,
A cooling device that cools the hot air of the hot aisle and supplies cold air to the cold aisle;
A differential pressure sensor for measuring a differential pressure between the hot aisle and the cold aisle;
A control device for starting or stopping the cooling device,
The controller is
The cooling device that is activated or stopped according to the measured value of the differential pressure sensor is selected , and the maximum value of the differential pressure between the hot aisle and the cold aisle measured by the differential pressure sensor is higher than a first threshold value. A priority of the cooling device with respect to the hot aisle where the differential pressure is a maximum value, and determining to start the cooling device with a high priority,
From the distance between the hot aisle and the cooling device and the operating state of the cooling device, the warm air of the hot aisle is calculated by a prediction formula that pre-determines the air volume ratio that the cooling device sucks, and the air volume ratio is in descending order. A cooling system, wherein a priority order of the cooling devices is determined .

The controller is
The maximum differential pressure between the hot aisle and the cold aisle measured by the differential pressure sensor is lower than the first threshold, and the minimum differential pressure between the hot aisle and the cold aisle measured by the differential pressure sensor. If the value is lower than the second threshold,
Cooling system according to claim 1, the differential pressure is calculated priority of the cooling device with respect to the hot aisle to the minimum value, and judging to stop the higher priority the cooling device.

The cooling system according to claim 1, further comprising a local cooling device that is installed in the vicinity of the device and locally cools heat generated by the device.

The controller is
The maximum differential pressure between the hot aisle and the cold aisle measured by the differential pressure sensor is lower than the first threshold, and the minimum differential pressure between the hot aisle and the cold aisle measured by the differential pressure sensor. If the value is lower than the second threshold,
The cooling system according to claim 3 , wherein a priority order of the cooling device with respect to the hot aisle having a minimum differential pressure is calculated and it is determined to stop the cooling device with the higher priority order.

The controller is
Wherein a distance of the hot aisle and the cooling device, the length of the front Symbol hot aisle and the localized cooling devices, the operating state of the cooling device, the operating state of the local cooling unit, from the warm air of the hot aisle cooling system according to claim 3 or 4 cooling device suck air amount ratio is calculated in advance by the prediction equation which has been determined, and determines the priority of the cooling device in order of the air volume ratio.

The controller is
When the cooling device determined to stop is the cooling device started in the previous operation,
Cooling system according to claim 2 or 4, characterized in that determines not to stop the cooling device.

  A hot aisle that forms a device row in which the air supply surfaces and exhaust surfaces of devices installed in a plurality of units are aligned, and in which the air supply surfaces of the device rows face each other and the exhaust surfaces of the device rows face each other In a room provided with a partition that suppresses mixing of air in the cold aisle and the hot aisle,
  A cooling device that cools the hot air of the hot aisle and supplies cold air to the cold aisle;
  A differential pressure sensor for measuring a differential pressure between the hot aisle and the cold aisle;
  A local cooling device that is installed in the vicinity of the device and locally cools the heat generated by the device;
  A control device for starting or stopping the cooling device,
  The controller is
  The cooling device that is activated or stopped according to the measured value of the differential pressure sensor is selected, and the maximum value of the differential pressure between the hot aisle and the cold aisle measured by the differential pressure sensor is higher than a first threshold value. A priority of the cooling device with respect to the hot aisle where the differential pressure is a maximum value, and determining to start the cooling device with a high priority,
  The hot air of the hot aisle is cooled from the distance between the hot aisle and the cooling device, the distance between the hot aisle and the local cooling device, the operating state of the cooling device, and the operating state of the local cooling device. The ratio of the air volume sucked by the device is calculated using a previously calculated prediction formula, and the priority order of the cooling devices is determined in descending order of the air volume ratio.
A cooling system characterized by that.

A hot aisle that forms a device row in which the air supply surfaces and exhaust surfaces of devices installed in a plurality of units are aligned, and in which the air supply surfaces of the device rows face each other and the exhaust surfaces of the device rows face each other An air conditioning control device that controls a cooling device that cools warm air of the hot aisle and supplies cold air to the cold aisle in a room provided with a partition that suppresses mixing of air in the cold aisle and the hot aisle Because
The cooling device that is activated or stopped according to the measured value of the differential pressure sensor that measures the differential pressure between the hot aisle and the cold aisle is selected, and the hot aisle and the cold aisle measured by the differential pressure sensor are selected . If the maximum value of the differential pressure is higher than the first threshold, calculate the priority of the cooling device for the hot aisle where the differential pressure is the maximum value, determine to start the cooling device with a high priority,
From the distance between the hot aisle and the cooling device and the operating state of the cooling device, the warm air of the hot aisle is calculated by a prediction formula that pre-determines the air volume ratio that the cooling device sucks, and the air volume ratio is in descending order. An air-conditioning control device, wherein priority order of the cooling devices is determined .

A hot aisle that forms a device row in which the air supply surfaces and exhaust surfaces of devices installed in a plurality of units are aligned, and in which the air supply surfaces of the device rows face each other and the exhaust surfaces of the device rows face each other An air conditioning control device that controls a cooling device that cools warm air of the hot aisle and supplies cold air to the cold aisle in a room provided with a partition that suppresses mixing of air in the cold aisle and the hot aisle Because
The cooling device that is activated or stopped according to the measured value of the differential pressure sensor that measures the differential pressure between the hot aisle and the cold aisle is selected, and the hot aisle and the cold aisle measured by the differential pressure sensor are selected. If the maximum value of the differential pressure is higher than the first threshold, calculate the priority of the cooling device for the hot aisle where the differential pressure is the maximum value, determine to start the cooling device with a high priority,
The distance between the hot aisle and the cooling device, the distance between the local cooling device that is installed in the vicinity of the device and locally cools the heat generated by the device and the hot aisle, the operating state of the cooling device, and the local Based on the operating state of the cooling device, the warm air of the hot aisle is calculated by a prediction formula in which the air volume ratio that the cooling device sucks is obtained in advance, and the priority order of the cooling device is determined in descending order of the air volume ratio < An air conditioning control device characterized by the above.

A hot aisle that forms a device row in which the air supply surfaces and exhaust surfaces of devices installed in a plurality of units are aligned, and in which the air supply surfaces of the device rows face each other and the exhaust surfaces of the device rows face each other And a cooling device that cools the hot air of the hot aisle and supplies cold air to the cold aisle in a room provided with a partition that suppresses mixing of air in the cold aisle and the hot aisle, and the hot aisle A cooling system air conditioning control method comprising: a differential pressure sensor for measuring a differential pressure of the cold aisle; and a control device for starting or stopping the cooling device,
When the maximum value of the differential pressure between the hot aisle and the cold aisle measured by the differential pressure sensor is higher than a first threshold,
Calculating the priority of the cooling device with respect to the hot aisle having a maximum differential pressure, and determining that the cooling device with the higher priority is activated;
The maximum differential pressure between the hot aisle and the cold aisle measured by the differential pressure sensor is lower than the first threshold, and the minimum differential pressure between the hot aisle and the cold aisle measured by the differential pressure sensor. If the value is lower than the second threshold,
Calculating the priority of the cooling device with respect to the hot aisle where the differential pressure is a minimum value, and determining that the cooling device with the higher priority is to be stopped ;
From the distance between the hot aisle and the cooling device and the operating state of the cooling device, the warm air of the hot aisle is calculated by a prediction formula that pre-determines the air volume ratio that the cooling device sucks, and the air volume ratio is in descending order. An air-conditioning control method, wherein priority order of the cooling devices is determined .

  A hot aisle that forms a device row in which the air supply surfaces and exhaust surfaces of devices installed in a plurality of units are aligned, and in which the air supply surfaces of the device rows face each other and the exhaust surfaces of the device rows face each other And a cooling device that cools the hot air of the hot aisle and supplies cold air to the cold aisle in a room provided with a partition that suppresses mixing of air in the cold aisle and the hot aisle, and the hot aisle A differential pressure sensor that measures the differential pressure of the cold aisle, a local cooling device that is installed in the vicinity of the device to locally cool the heat generated by the device, and a control device that starts or stops the cooling device; A cooling system air conditioning control method comprising:
  When the maximum value of the differential pressure between the hot aisle and the cold aisle measured by the differential pressure sensor is higher than a first threshold,
  Calculating the priority of the cooling device with respect to the hot aisle having a maximum differential pressure, and determining that the cooling device with the higher priority is activated;
  The maximum differential pressure between the hot aisle and the cold aisle measured by the differential pressure sensor is lower than the first threshold, and the minimum differential pressure between the hot aisle and the cold aisle measured by the differential pressure sensor. If the value is lower than the second threshold,
  Calculating the priority of the cooling device with respect to the hot aisle where the differential pressure is a minimum value, and determining that the cooling device with the higher priority is to be stopped;
  The hot air of the hot aisle is cooled from the distance between the hot aisle and the cooling device, the distance between the hot aisle and the local cooling device, the operating state of the cooling device, and the operating state of the local cooling device. The ratio of the air volume sucked by the device is calculated using a previously calculated prediction formula, and the priority order of the cooling devices is determined in descending order of the air volume ratio.
The air-conditioning control method characterized by the above-mentioned.