JP5997671B2 - Air conditioning control method and air conditioning control system - Google Patents

Description

  The present invention relates to an air conditioning control method and an air conditioning control system, and more particularly to an air conditioning control method and an air conditioning control system for controlling air conditioning in a room in which a plurality of ICT devices such as a server room, a communication machine room, and a data center are installed. .

  Conventionally, there is an air conditioning control system for controlling a cooling air conditioner for cooling an ICT device in a server room, a communication machine room or a data center where a plurality of ICT (Information and Communication Technology) devices are installed. To do. In the conventional cooling air conditioning system, the set temperature of the air conditioner is set sufficiently low, the temperature in the vicinity of the ICT device is measured, and the set temperature of the air conditioner is controlled so as to be maintained at a constant temperature.

  In the conventional cooling air conditioning system, in order to avoid a load on some ICT devices and the accumulation of exhaust heat of the ICT devices, the ICT devices are cooled more than necessary by the cooling air conditioners. However, if the set temperature of the air conditioner for cooling is lowered more than necessary, the power consumption of the air conditioner increases. Accordingly, it has been required to appropriately control the set temperature of the air conditioner while minimizing the power consumption of the air conditioner.

Asayasu Hiroshi, Nakajima Tadakatsu, Okitsu Jun, Kato Takeshi, Saito Tatsuya, Toshima Yasuhiro, “IT-linked air conditioning optimization control method for environment-friendly data center”, IEICE Transactions, B Vol.J95-B, No.3, pp.397-404, 2012 Tetsuo Ichimori, "Mathematical programming-Optimization technique", Kyoritsu Shuppan, p. 4, August 1994

  For example, the prior art described in Non-Patent Document 1 uses a simulator that models the relationship between the intake temperature / blowout temperature of an air conditioner and the intake air temperature / exhaust temperature of an ICT device, to determine the temperature condition of the intake temperature of the ICT device. In order to minimize the total power consumption of the air conditioner while satisfying, the air temperature of the air conditioner is set to save energy. The air-conditioned room refers to, for example, a server room in which a plurality of ICT devices and a rack in which a plurality of ICT devices are stored, and a communication machine room.

  In the air conditioning control method described in Non-Patent Document 1, a set temperature of the air conditioner is calculated using a simulator so as to minimize the power consumption of the air conditioner. However, in the air conditioning control method described in Non-Patent Document 1, since the power consumption of the ICT device is not considered, it is unclear whether the power consumption of the ICT device has increased.

  Normally, the power consumption of the air conditioner is reduced by raising the set temperature of the air conditioner in the cooling operation. However, when the set temperature of the air conditioner rises, the suction temperature of the ICT device rises and the internal temperature of the ICT device also rises. Since the operating rate of the cooling fan built in the ICT device increases as the internal temperature of the ICT device increases, the power consumption used by the cooling fan increases as the operating rate of the cooling fan increases. Therefore, the power consumption of the ICT device increases as the set temperature of the air conditioner for cooling operation increases. Therefore, even if the power consumption of the air conditioner can be reduced by raising the set temperature of the air conditioner, there is a problem that the power consumption of the ICT device may increase.

  The present invention has been made in view of such problems. The object of the present invention is to maintain an air-conditioning room at a safe temperature, and to achieve air-conditioning and ICT device energy saving. A control method and an air conditioning control system are provided.

  As means for solving the above problems, an ICT device, an air conditioner for controlling the temperature of the ICT device, and an air conditioner and an ICT device control device for controlling the operation / stop of the air conditioner and the ICT device are networked. In the air-conditioning / ICT device control system connected in the above, the means for obtaining the blow-out temperature of the air-conditioner, the means for obtaining power consumption of the air-conditioner, and the suction temperature of the ICT device from the blow-off temperature of the air-conditioner A means for estimating, a means for estimating the power consumption of the air conditioner from the blowing temperature of the air conditioner, a means for obtaining the power consumption of the ICT apparatus, and the power consumption of the ICT apparatus from the suction temperature of the ICT apparatus. Means for estimating, an estimated value of the suction temperature of the ICT device is equal to or lower than an upper limit temperature of the ICT device, and power consumption of the air conditioner and power consumption of the ICT device It is characterized in that it comprises means for determining the operation and stop of the air temperature and the ICT device of the air conditioner so as to minimize the total.

  In order to achieve such an object, the present invention according to claim 1 is a preset air conditioner that cools the ICT device when the suction temperature of the ICT device exceeds a certain temperature. An air conditioning control method by a system that changes the first blowing temperature to the second blowing temperature, and a first calculation formula for estimating the suction temperature of the ICT device based on the first blowing temperature is Based on the first step of calculating, the second step of calculating the second calculation formula for estimating the power consumption of the air conditioner based on the first blowing temperature, and the suction temperature of the ICT device A third step of calculating a third calculation formula for estimating the power consumption of the ICT device, and the second step so that the total value of the power consumption of the air conditioner and the power consumption of the ICT device is minimized. And the third calculation A second conditional expression in which the first conditional expression calculated based on the objective function is an objective function, and a value obtained by substituting the second blowing temperature into the first calculating expression is equal to or less than a first threshold value. According to the fourth step as the constraint condition and the mathematical function using the objective function and the constraint condition, the second blowing temperature is calculated, and the number of the ICT devices necessary for processing a predetermined load is obtained. And a fifth step of determining the ICT device to be operated.

  As described above, according to the present invention, the air conditioning room can be maintained at a safe temperature, and further, energy saving of the air conditioner and the ICT device can be realized.

It is a lineblock diagram showing an air-conditioning control system concerning one embodiment of the present invention. It is a block diagram which shows the air conditioner and ICT apparatus control apparatus concerning one Embodiment of this invention. It is a flowchart which shows the air-conditioning control method concerning one Embodiment of this invention.

  Hereinafter, embodiments of the air conditioning control method and the air conditioning control system of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a configuration of an air conditioning control system according to an embodiment of the present invention. The air conditioning room 1 includes a plurality of ICT devices 2I _j and a plurality of air conditioners 3A _i that cool the ICT devices 2I _j . The air conditioner / ICT device control device 4 that controls the operation and stop of the ICT device 2I _j and controls the blowing temperature of each air conditioner 3A _i , the plurality of ICT devices 2I _j, and the plurality of air conditioners 3A _i are: They are connected by a network 5 such as a LAN (Local Area Network).

The outlet temperature of the air conditioner 3A _i, the temperature in the vicinity of outlet of the cold air of the air conditioner 3A _i. Outlet temperature of the air conditioner 3A _i is measured by installed temperature sensor near the air outlet of the air conditioner 3A _i. Set temperature of the air conditioner 3A _i is different from the air temperature is measured temperature, which is the target value of the air temperature. What can actually be set by air conditioning is a set temperature, which is a target value of the blowing temperature, and it takes a certain amount of time for the blowing temperature to be equal to the set temperature.

ICT device 2I _j includes ICT device 2I ₁ ,... ICT device 2I _m (j = _{1 to m} , m is a positive integer). The ICT device 2I _j includes a temperature sensor unit that measures the suction temperature of the ICT device 2I _j . The ICT device 2I _j is, for example, an IT device such as a server or a communication device, and can be stored in a server rack.

The inlet temperature of the ICT device 2I _j, which is the temperature of the vicinity of an opening to be sucked into the ICT device 2I _j. Inlet temperature of the ICT device 2I _j is measured by a temperature sensor installed in the vicinity of an opening to be sucked into the ICT device 2I _j.

The air conditioner 3A _i includes air conditioners 3A ₁ ,... 3A _n (i = 1 to n, n is a positive integer). Air conditioner 3A _i, for example, consists of an indoor unit and an outdoor unit. In FIG. 1, the air conditioner is included in the air conditioning room, but the air conditioner may be provided in a room different from the air conditioning room and supply cold air to the ICT apparatus through a duct. Air conditioner 3A _i is capable of temperature setting for controlling the air temperature, measures the air temperature, the power consumption of the air conditioner 3A _i.

Air conditioner · ICT device controller 4, SNMP (Simple Network Management Protocol) outlet temperature information of each air conditioner 3A _i by using a power consumption information for each of the air conditioners 3A _i, suction of the ICT device 2I _j Information on temperature and information on power consumption of each ICT device 2I _j can be collected, and the blowout temperature of each air conditioner 3A _i can be set. The air conditioner · ICT device controller 4 in response to a predetermined load to be processed in the ICT device 2I _j, or to run any ICT device 2I _j, also determines whether to stop any ICT device 2I _j .

FIG. 2 is a block diagram of the air conditioner / ICT device control device 4 according to an embodiment of the present invention. Air conditioner · ICT device control device 4, the air conditioner information acquiring unit 41 that collects power consumption information of the air temperature information and each of the air conditioners 3A _i of each air conditioner 3A _i from each of the air conditioners 3A _i via LAN , an ICT device information acquiring unit 42 receives information of the power consumption of the suction temperature information and the ICT device 2I _j of each ICT device 2I _j from the sensor unit of the ICT device 2I _j, outlet temperature of each air conditioner 3A _i comprising information, power consumption information for each of the air conditioners 3A _i, and a storage unit 43 for storing such information for the suction temperature of the ICT device 2I _j. In addition, the air conditioner / ICT device control device 4 includes an ICT device suction temperature estimation unit 44 (first calculation unit) that calculates an estimated value of the suction temperature of each ICT device 2I _j from an expression described later, and each air conditioner 3A. _i an estimate of power consumption, the air conditioner consumed power estimation unit 45 for calculating the later-described equation (second calculation unit), an estimate of the power consumption of each ICT device 2I _j, calculated from below formula An ICT device power consumption estimation unit 46 (third calculation unit). The air conditioner / ICT device control device 4 includes an air conditioner outlet temperature / ICT device operation stop setting unit 47. The air conditioner outlet temperature / ICT device operation stop setting unit 47 satisfies a certain temperature condition regarding the ICT device, and is the sum of the total power consumption of each air conditioner 3A _i and the total power consumption of each ICT device 2I _j. There is set the condition calculation unit 471 to calculate the equation for determining the outlet temperature of the air conditioner 3A _i to be the minimum (fourth calculation unit), an outlet temperature of each air conditioner 3A _i, of each ICT device 2I _j A determination unit 472 that controls operation and stoppage.

Air conditioner information acquisition unit 41 collects power consumption information of the air temperature information and each of the air conditioners 3A _i of each air conditioner 3A _i from each of the air conditioners 3A _i via LAN, ICT device information acquisition unit 42, collecting power usage information of the suction temperature and the ICT device 2I _j of each ICT device 2I _j from each ICT device 2I _j via the LAN. The following (Expression 1) (first calculation expression) shows a relational expression representing what the suction temperature of each ICT device 2I _j will be when the blowout temperature of each air conditioner 3A _i is changed.
_{T j = f j (S 1} , S 2, ... S n) j = 1~m ( Equation 1)

n is the number of air conditioners 3A _i, m number of ICT device 2I _j, T _j is the estimated value of the suction temperature of the ICT device _{2I j, S 1, S 2} , ... S n is outlet temperature of the air conditioner 3A _i ( (First blowing temperature), f _j is a function representing the suction temperature of the ICT device 2I _j with the blowing temperature of the air conditioner 3A _i as a variable. The ICT device suction temperature estimation unit 44 calculates an estimated value T _j of the suction temperature of each ICT device 2I _j from (Equation 1). The function f _j representing the suction temperature of the ICT device 2I _j is determined by the learning data stored in the storage unit 43 in advance, and is given by a linear expression of the blowout temperature S _i of the air conditioner 3A _{i in} a simple function. Can do.

The simplest form of the function f _j is shown by the following linear expression (Expression 2).
a ₁ S ₁ + a ₂ S ₂ +… + a _n S _n (Formula 2)

a _i (i = 1 to n, n is a positive integer) is a positive coefficient of S _i , and the method of determining the coefficient a _i uses the least square method.

When the air outlet temperature of each air conditioner 3A _i is changed, the suction temperature of the ICT device 2I _j also changes with the passage of time, so that the air outlet temperature of each air conditioner 3A _{i and} the air inlet temperature of the ICT device 2I _j differ at different times. Prepare multiple sets of data. A plurality of sets of data having different times are stored in the storage unit 43 as learning data.

It indicates a vector of data of measured values of the suction temperature of the ICT device 2I _j the following (Equation 3).
T = (T _j (1), T _j (2), ..., T _j (k)) ^t (Formula 3)

The numbers in parentheses of T _j each represent time (for example, if the unit time is every 10 minutes, 1 represents 10 minutes, 2 represents 20 minutes), and t represents transposition.

Further, it shows a matrix of data of measured values of air temperature of each air conditioner 3A _i the following (Equation 4).

The numbers in parentheses of S ₁ , S ₂ ,... S _n each represent the same time as the time of T _j .
A vector A with coefficients a _i as elements,
A = (a ₁ , a ₂ , ..., a _n ) ^t (Formula 5)
Then,
A = (S ^t S) ^-1 S ^t T (Formula 6)
It becomes. (S ^t S) ⁻¹ represents an inverse matrix of S ^t S. Using equations (3) to (6), the coefficients a ₁ , a ₂ ,..., A _n of the ICT devices 2I _j are determined. Accordingly, the vector T consisting of data of the suction temperature of the ICT device 2I _j, and a matrix S including data of air temperature of each air conditioner 3A _i, coefficients a _1, a _2, ..., can be obtained a _n , Functions f _j and (Equation 1) can be determined.

ICT suction temperature of the device 2I _j includes a blowing temperature of the air conditioner 3A _i, may be expression that the variable airflow volume of cooling air for cooling the ICT device 2I _j. Airflow volume of the air conditioner 3A _i is may be controlled in proportion to the cooling capacity of the air conditioner 3A _i (processing heat). The cooling capacity refers to the amount of heat (kW) that can be removed from the room per unit time when the air conditioner is cooled. Therefore, the cooling capacity of the air conditioner 3A _i after changing the set temperature of the air conditioner 3A _i is, before the setting temperature change of the air conditioner 3A _i and blowing air volume, the suction temperature and the air-conditioner 3A _i of the air conditioner 3A _i It can be estimated from the blowing temperature set value. Therefore, from the estimated value of the cooling ability can be estimated airflow volume after setting the temperature change of the air conditioner 3A _i. When estimating the airflow volume after setting change of the air conditioner 3A _i from estimated cooling capacity of the air conditioner 3A _i, the air conditioner information obtaining unit 41 obtains the airflow volume of each of the air conditioners 3A _i, ICT device information acquisition unit 42 acquires the actual suction temperature of the ICT device 2I _j.

Using the air temperature of each air conditioner 3A _i acquired by the air conditioner information acquisition unit 41, the relational expression for estimating the power consumption of the air conditioner 3A _i when the air temperature of the air conditioner 3A _i is changed is as follows ( It is shown in Formula 7) (second calculation formula).
P _i = g _i (S _i ) i = 1 to n (Expression 7)

S _i is outlet temperature of the air conditioner 3A _i, P _i is the estimated value of the power consumption of the air conditioner 3A _i, g _i is a function which represents the power consumption of the air conditioner 3A _i that the outlet temperature of the air conditioner 3A _i as a variable is there. The air conditioner power consumption estimation unit 45 calculates an estimated value P _{i of the} power consumption of each air conditioner 3A _i from (Equation 7). A function representing the power consumption of the air conditioner 3A _i is also determined by learning data stored in the storage unit 43 in advance. In a simple function, it can be given by a linear expression of the blowout temperature S _i of the air conditioner 3A _i , and is given by a quadratic expression for higher accuracy.

The simplest form of the function g _i is shown by the following linear expression (Expression 8).
b ₁ S _i + b ₂ (Formula 8)

b ₁ is a negative coefficient of S _i , b ₂ is a positive constant, and the method of determining the coefficient b ₁ and the constant b ₂ uses the least square method.

Varying the outlet temperature S _i of the air conditioner 3A _i, for changing the course both power consumption P _i and time of the air conditioner 3A _i, time different, blowing temperature S _i and the air conditioner 3A _i of the air conditioner 3A _i a set of data of the power consumption P _i of preparing a plurality. A plurality of sets of data having different times are stored in the storage unit 43 as learning data.

A vector composed of the data of the actually measured power consumption of the air conditioner 3A _i is shown in the following (Equation 9).
P = (P _i (1), P _i (2), ..., P _i (k)) ^t (Equation 9)

The numbers in parentheses of P _i each represent time (for example, if the unit time is every 10 minutes, 1 represents 10 minutes, 2 represents 20 minutes), and t represents transposition.

Further, it shows a matrix of data of the actual measurement values of the air temperature of the air conditioner 3A _i the following equation (10).

Each of the numbers in the parentheses of the S _i represents the same time as the time of P _i.

A vector B whose elements are coefficient b ₁ and constant b ₂ is
B = (b ₁ , b ₂ ) ^t (Formula 11)
Then,
B = (U ^t U) ⁻¹ U ^t P (Formula 12)
It becomes. (U ^t U) ⁻¹ represents an inverse matrix of U ^t U. Using the equation (9) (Equation 12), for each air conditioner 3A _i, the coefficient b ₁ of each of the air conditioners 3A _i, determining the value of b _2. Coefficients b _1, by the constant b ₂ is determined, to determine the equation (8) is determined, by (Equation 8) determines the function g _i and (Equation 7) in each of the air conditioners 3A _i it can.

Estimation method of power consumption of the air conditioner 3A _i may estimated airflow volume after air temperature and the set temperature change of the air conditioner 3A _i as an expression whose variable. When estimating the power consumption of the air conditioner 3A _i using the estimated airflow volume after air temperature and the set temperature change of the air conditioner 3A _i, the air conditioner information obtaining unit 41 obtains the airflow volume of each of the air conditioners 3A _i To do.

Using the suction temperature of the ICT device 2I _j acquired by ICT device information acquiring unit 42, ICT device 2I _j of the equation for estimating the power consumption of the ICT device 2I _j when the suction temperature was varied in the following ( This is shown in Equation 13) (third calculation equation).
Q _j = h _j (T _j ) j = 1 to m (Formula 13)

Q _j is an estimated value of power consumption of the ICT device 2I _j , and h _j is a function representing the power consumption of the ICT device 2I _{j with} the suction temperature T _j of the ICT device 2I _j as a variable. The ICT device power consumption estimation unit 46 calculates an estimated value Q _{j of the} power consumption of each ICT device 2I _j from (Equation 13). A function representing the power consumption of the ICT device 2I _j is also determined by learning data stored in advance in the storage unit 43. In a simple function, it can be given by a linear expression of the suction temperature T _j of the ICT device 2I _j , and is given by a quadratic expression for higher accuracy.

The simplest form of the function h _j is shown by the following linear expression (Expression 14).
d ₁ T _j + d ₂ (Formula 14)

d ₁ is a positive coefficient of T _j , d ₂ is a positive constant, and the method of determining the coefficient d ₁ and the constant d ₂ uses the least square method.

Varying the suction temperature of the ICT device 2I _j, to change the course of both the power consumption time of the ICT device 2I _j, time different, the power consumption of the suction temperature and ICT device 2I _j of ICT device 2I _j data Prepare multiple sets. A plurality of sets of data having different times are stored in the storage unit 43 as learning data.

Indicates a vector of data of the actual measurement value of the power consumption of the ICT device 2I _j the following equation (15).
Q = (Q _j (1), Q _j (2), ..., Q _j (k)) ^t (Formula 15)

The numbers in parentheses of Q _j each represent time (for example, 1 is 10 minutes and 2 is 20 minutes if the unit time is every 10 minutes), and t represents transposition.

Further, it shows a matrix of data of measured values of the suction temperature of the ICT device 2I _j the following equation (16).

The numbers in the parentheses of T _j represent the same time as the time of Q _j .

A vector D whose elements are coefficient d ₁ and constant d ₂ is
D = (d ₁ , d ₂ ) ^t (Formula 17)
Then,
D = (V ^t V) ^-1 V ^t Q (Formula 18)
It becomes. (V ^t V) ⁻¹ represents an inverse matrix of V ^t V. Using the equation (15) to (Equation 18) for each ICT device 2I _j, determining the coefficients d ₁ and the constant d ₂ of each ICT device 2I _j. By determining the coefficient d ₁ and the constant d ₂ , (Equation 14) is determined, and by (Equation 14), the function h _j and (Equation 13) of each ICT device 2I _j can be determined. .

Air conditioner blow temperature · ICT device operation stop setting unit 47, for example, outside temperature or rises, the temperature load is increased any ICT device 2I _j is or raised, the suction temperature of the ICT device 2I _j when deviating a satisfies the original temperature, and outlet temperature of the air conditioner 3A _i the sum is minimum between the total power consumption of the total and the ICT device 2I _j of the power consumption of each of the air conditioners 3A _i Ask for. As a method for determining the outlet temperature of the air conditioner 3A _i uses mathematical programming. Mathematical programming is a technique for obtaining a set of variables that minimizes or maximizes an arbitrary objective function under a constraint condition expressed by an arbitrary equality or inequality (see, for example, Non-Patent Document 2).

When using a mathematical programming as a method for determining the outlet temperature of the air conditioner 3A _i, set of variables to determine is a variable representing the operating-stop state of the air temperature and the ICT device 2I _j of each of the air conditioners 3A _i, minimizing the objective function is the sum of the total power consumption of the total and the ICT device 2I _j power consumption of each of the air conditioners 3A _i to. The objective function is shown in the following (formula 19) (first conditional formula).

r _j is a variable representing the operating and stopping state of the ICT device 2I _j, the case of ICT device 2I _j is the operating state and 1, where ICT device 2I _j is in the stopped state is 0. S ′ _i is the required air outlet temperature (second air outlet temperature) 3A _i . The conditional expression calculation unit 471 calculates (Expression 19) based on (Expression 3), (Expression 13) and the variable r _j indicating the operating / stopped state of the ICT device 2I _j . When the ICT device 2I _j is in a stopped state, the power consumption of the ICT device 2I _j is zero. In (Equation 19), the suction temperature T _j of the ICT device 2I _j is a function of the blowing temperature S _i of the air conditioner 3A _{i according} to (Equation 1). Substituting (Equation 1) into T _j in (Equation 19) yields the following (Equation 20).

From (Equation 20), it can be seen that (Equation 19) is a function of the blowing temperature S ′ _i of each air conditioner 3A _{i and} the variable r _j representing the operating / stopped state of each ICT device 2I _j .

The conditional expression calculation unit 471 calculates the following (Expression 21) (second conditional expression) using (Expression 1) as an inequality constraint condition indicating the temperature condition of the ICT device 2I _j .
f _j (S ′ ₁ , S ′ ₂ ,..., S ′ _n ) ≦ T ^# j = ^{1 to} m (Formula 21)

T ^# is the maximum temperature of a suction temperature of the ICT device 2I _j (first threshold value), the inlet temperature of the ICT device 2I _j is the probability of failure of the internal components of the upper limit temperature T ^# exceeds the ICT device 2I _j Get higher. The upper limit temperature T ^# is, for example, 27 ° C. The internal components of the ICT device 2I _j are a hard disk drive (HDD), a power supply, a memory, and the like.

In addition, the conditional expression calculation unit 471 considers the variable r _j indicating the operating / stopped state of the ICT device 2I _j in (Expression 21), and the following (Expression 22) is used as an inequality constraint condition indicating the temperature condition of the ICT device 2I _j. ) (Third conditional expression) may be calculated.
f _j (S ′ ₁ , S ′ ₂ ,..., S ′ _n ) ≦ T ^# + W (1−r _j ) j = 1 to m (Formula 22)

W is a sufficiently large positive constant. If ICT device 2I _j is running, the variable r _j representing the operation-stopped state of the ICT device 2I _j is 1. Therefore, the right side second term is made zero right side and T ^#, the constraint that the suction temperature of the ICT device 2I _j running shall not exceed the upper limit temperature T ^# condition (Equation 22). When the ICT device 2I _j is stopped, the variable r _j indicating the operating / stopped state of the ICT device 2I _j is 0, so the second item on the right side of (Equation 22) is a constant W and the right side is (T ^# + W) (second threshold). That is, the suction temperature of the stopped ICT device 2I _j is equivalent to the fact that it may exceed the original upper limit temperature T ^# , and there is virtually no restriction on the upper limit temperature of the stopped ICT device 2I _j. become. It is because, if the ICT device 2I _j is operating, suction temperature of the ICT device 2I _j is the higher the probability of failure of the internal components of the upper limit temperature T ^# exceeds the ICT device 2I _j, ICT device 2I _j is If it is stopped, the probability of failure of the internal components of the ICT device 2I _j even suction temperature exceeds the upper limit temperature T ^# of ICT device 2I _j is because little.

The constraint condition regarding the number of operating ICT devices 2I _j is expressed by the following (Equation 23).

r ^# is the number of operating ICT devices 2I _j required to execute processing of a predetermined load. Further, a combination R of variables r _j representing a state where the total number of m ICT devices 2I _j is stopped is expressed as follows.
R = (r ₁ , r ₂ ,..., R _m ) j = _{1 to m} (Formula 24)

Condition calculation unit 471 determines the operation number r ^# of ICT device 2I _j required to handle the given load. For example the total number of ICT device 2I _j as (m = 5) stand, when three of the operation number r ^# of ICT device 2I _j required to process a predetermined load, stopping the number of ICT device 2I _j is 2 units.

Further, a variable combination R representing a state in which the operation of the five ICT devices 2I _j is stopped is expressed by the following (Equation 25).
R = (r ₁ , r ₂ , r ₃ , r ₄ , r ₅ ) (Formula 25)

A variable r _j representing a state where the operation of the ICT device 2I _j is stopped is linked to the ICT device 2I _j . For example variables r ₁ is tied to ICT device 2I _1, the variable r ₂ is linked to the ICT device 2I _2.

The determination unit 472 sets the operation stop state of the ICT device 2I _j and the blowing temperature of each air conditioner 3A _i by mathematical programming using (Equation 19) as an objective function and (Equation 22) and (Equation 23) as constraints. Decide each. As mathematical programming, mixed integer quadratic programming may be used, and commercially available packages can be used. For example, if it is determined that the ICT device 2I ₁ operates, the ICT device 2I ₂ operates, the ICT device 2I ₃ stops, the ICT device 2I ₄ operates, and the ICT device 2I ₅ stops, the variable r ₁ is 1, the variable r ₂ is 1, the variable r ₃ is 0, the variable r ₄ is 1, and the variable r ₅ is 0. Therefore, (Expression 25) is expressed by the following (Expression 26).
R = (1,1,0,1,0) (Formula 26)

The determination unit 472 executes the operation or stop of each ICT device 2I _j according to the variable r _j that represents the state where the operation of the ICT device 2I _j stops, as shown in (Equation 26). The blowout temperature of each air conditioner 3A _i calculated and set by sending to the respective air conditioners 3A _i.

Note that the determination unit 472 determines the operation stop state of each ICT device 2I _j and the blowing temperature of each air conditioner 3A _i using mathematical programming with (Expression 21) as a constraint instead of (Expression 22). May be.

In addition to (Equation 23), the constraint condition regarding the number of operating ICT devices 2I _j may be more generally a constraint condition regarding the total of resources of the ICT device 2I _j as shown in the following (Equation 27).

c _j is the CPU performance of the ICT device 2I _j , the amount of resources such as the memory amount and I / O speed, c ^# is the CPU performance and memory of the ICT device 2I _j required to execute processing of a predetermined load This is the total of resources such as volume and I / O speed.

FIG. 3 shows a flowchart of an air conditioning control method according to an embodiment of the present invention. Air conditioner information obtaining unit 41, the information of the air temperature S _i collect power consumption P _i of information and each of the air conditioners 3A _i of each of the air conditioners 3A _i, ICT device information acquisition unit 42, the ICT device 2I _j to collect the information of the suction temperature T _j. ICT device suction temperature estimation unit 44, based on the information of the air temperature S _i of each of the air conditioners 3A _i collected and learned data of the information of the inlet temperature T _j of each ICT device 2I _j, the suction of the ICT device 2I _j estimating the temperature T _j (equation 1) to determine the (S101) (first step), the air conditioner consumed power estimation unit 45, the information and the air-conditioning power consumption P _i of each of the air conditioners 3A _i collected based on the learning data of the information of the blowout temperature S _i of the machine 3A _i, determining the estimated power consumption P _i of the air conditioner 3A _i (equation 7) (S102) (second step). The determined (Expression 1) and (Expression 7) are recorded in the storage unit 43.

ICT device information acquisition unit 42 collects information of the power consumption Q _j of the suction temperature T _j of information and the ICT device 2I _j of each ICT device 2I _j. ICT devices the power consumption estimation unit 46, based on the information of the inlet temperature T _j of each ICT device 2I _j collected and learned data of the information of power consumption Q _j of each ICT device 2I _j, consumption of ICT devices 2I _j The power Q _j is estimated (Equation 13) is determined (S103) (third step), and the determined (Equation 13) is recorded in the storage unit 43.

Condition calculation unit 471, if the suction temperature of the ICT device 2I _j exceeds a predetermined temperature, determines the running number r ^# of ICT devices required to process the predetermined load (S104).

The conditional expression calculation unit 471 calculates (Expression 19), (Expression 22), and (Expression 23) based on (Expression 1), (Expression 7), (Expression 13), and the operating number r ^# of the ICT device. Calculate (S105).

The determination unit 472 uses (Equation 19) as an objective function and (Equation 22) and (Equation 23) as constraints (fourth step), and calculates the total power consumption of each air conditioner 3A _i and each ICT device 2I _j. The set temperature of each air conditioner 3A _i that minimizes the total power consumption and the variable r _j representing the operation stop of each ICT device 2I _j are determined by mathematical programming (S106) (fifth step). Specific mathematical formulas for mathematical programming in step S106 are shown in the following (formula 28) to (formula 34).

st
T _j = f _j (S ′ ₁ , S ′ ₂ ,..., S ′ _n ) (Formula 29)
f ₁ (S ′ ₁ , S ′ ₂ ,..., S ′ _n ) ≦ T ^# + W (1−r ₁ ) (Equation 30)
f ₂ (S ′ ₁ , S ′ ₂ ,..., S ′ _n ) ≦ T ^# + W (1−r ₂ ) (Formula 31)
・
・
・
f _m (S ′ ₁ , S ′ ₂ ,..., S ′ _n ) ≦ T ^# + W (1−r _m ) (Formula 32)

r _j ∈ {0,1} (Formula 34)

(Equation 28) is an objective function indicating that the sum of the total power consumption of each air conditioner 3A _i and the total power consumption of each ICT device 2I _j is minimum, and corresponds to (Equation 19). (Equation 29) corresponds to (Equation 1) that represents the relational expression between the blowout temperature of the air conditioner 3A _i and the suction temperature of the ICT device 2I _j , and is used when calculating (Equation 28). (Equation 30) to (Equation 32) are inequality constraints representing the temperature condition of the ICT device 2I _j , and correspond to (Equation 22). (Equation 33) is a constraint on operation the number of ICT device 2I _j, corresponding to the equation (23). (Expression 34) represents that the variable r _j representing the operation stop of each ICT device 2I _j takes a numerical value of 0 or 1, and (Expression 28), (Expression 30) to (Expression 32), and (Expression 33). ) Is used when calculating.

From step S104 to step S106, the sum of the total power consumption Pi of each air conditioner 3A _i and the total power consumption Q _j of each ICT device 2I _j is minimized (Equation 19) as an objective function. ) to the outlet temperature S 'value obtained by substituting the _i is equal to or less than the upper limit temperature of the suction temperature of the ICT device 2I _j (constraint equation 22) of the air conditioner 3A _i. Also in step S106 from step S104, the mathematical programming method using the objective function and constraints, the air conditioner 3A _i calculate the air temperature S _'i of the number of ICT device 2I _j required to process a predetermined load Based on r ^# , the ICT device 2I _j to be operated / stopped is determined.

In step S104 to step S106, the mathematical programming method is obtained by adding an arbitrary constant to the upper limit temperature of the suction temperature of the ICT device 2I _{j so that} the suction temperature of the ICT device 2I _j determined to be stopped by the mathematical programming method. A constraint condition that is less than or equal to the second threshold value (T ^# + W) may be further used.

The determination unit 472 transmits information on the operation stop of each ICT device, stops the operation of the target ICT device, transmits and sets the set temperature of each air conditioner, and controls each air conditioner ( S107). Each air conditioner 3A _i supplies air to each ICT device 2I _j at the set blowing temperature.

When the number of operating ICT devices 2I _j necessary for processing a predetermined load changes, the process returns to step S104 again, and a variable indicating the set temperature of the new air conditioner 3A _i and the operating / stopped state of the ICT device 2I _j is obtained. calculate.

The storage unit 43 includes a ROM (Read Only Memory) and a RAM (Random Access Memory). In the ROM, programs and various data (for example, a calculation formula for estimating the suction temperature of the ICT device 2I _j and the consumption of the air conditioner 3A _i are necessary for controlling the operation of the air conditioner / ICT device control device 4 as a whole. The calculation formula for estimating the power is recorded. The RAM is provided with a recording area for temporarily storing data and programs, and holds programs and data.

Further, the determination of the function f _j , the function g _i , and the function h _j is performed by incorporating the measurement function and the learning function necessary for the air conditioning control system of the present invention, and first performing learning for the function determination. The function determined using another system may be stored in the air conditioning control system of the present invention.

  According to the present embodiment, the air conditioning room can be maintained at a safe temperature, and further, energy saving of the air conditioner can be realized.

1 air-conditioned room _{2I 1, 2I 2, 2I j} , 2I m ICT device _{3A 1, 3A 2, 3A i} , 3A n air conditioner 4 air conditioner · ICT device controller 5 network 41 air conditioner information acquiring unit 42 ICT device information acquisition Unit 43 storage unit 44 ICT device suction temperature estimation unit 45 air conditioner power consumption estimation unit 46 ICT device power consumption estimation unit 47 air conditioner outlet temperature / ICT device operation stop setting unit 471 conditional expression calculation unit 472 determination unit

Claims (8)

When the suction temperature of the ICT device exceeds a certain temperature, the air conditioning control method by the system changes the preset first blowing temperature of the air conditioner that cools the ICT device to the second blowing temperature. And
A first step of calculating a first calculation formula for estimating a suction temperature of the ICT device based on the first blowing temperature;
A second step of calculating a second calculation formula for estimating the power consumption of the air conditioner based on the first blowing temperature;
A third step of calculating a third calculation formula for estimating the power consumption of the ICT device based on the suction temperature of the ICT device;
The first conditional expression calculated based on the second calculation formula and the third calculation formula so that the total value of the power consumption of the air conditioner and the power consumption of the ICT device is minimized. And a fourth step in which a second conditional expression that sets a value obtained by substituting the second blowing temperature into the first calculation formula to be equal to or less than a first threshold is a constraint condition;
The second blowing temperature is calculated by mathematical programming using the objective function and the constraint condition, and the ICT device to be operated is determined based on the number of the ICT devices necessary for processing a predetermined load. An air conditioning control method comprising: a fifth step. The first step of calculating is:
2. The air conditioning control method according to claim 1, wherein a first calculation formula for estimating a suction temperature of the ICT device is calculated based on a blowing temperature of the air conditioner and an amount of air blown from the air conditioner. . The second step of calculating is
The second calculation formula for estimating the power consumption of the air conditioner is calculated based on the temperature of the air conditioner and the amount of air blown from the air conditioner. Air conditioning control method.   In the mathematical programming method, the suction temperature of the ICT device whose stoppage is determined by the mathematical programming method is set to be equal to or lower than a second threshold value obtained by adding an arbitrary positive constant to the first threshold value. The air conditioning control method according to any one of claims 1 to 3, further comprising using a constraint condition as a conditional expression. When the suction temperature of the ICT device exceeds a certain temperature, the air conditioning control system changes the preset first blowing temperature of the air conditioner that cools the ICT device to the second blowing temperature,
A first calculation unit for calculating a first calculation formula for estimating a suction temperature of the ICT device based on the first blowing temperature;
A second calculating unit that calculates a second calculation formula for estimating power consumption of the air conditioner based on the first blowing temperature;
A third calculation unit for calculating a third calculation formula for estimating the power consumption of the ICT device based on the suction temperature of the ICT device;
The first conditional expression calculated based on the second calculation formula and the third calculation formula so that the total value of the power consumption of the air conditioner and the power consumption of the ICT device is minimized. And a fourth calculation unit having a second conditional expression as a constraint condition that a value obtained by substituting the second blowing temperature into the first calculation formula is equal to or less than a first threshold value;
The second blowing temperature is calculated by mathematical programming using the objective function and the constraint condition, and the ICT device to be operated is determined based on the number of the ICT devices necessary for processing a predetermined load. An air-conditioning control system comprising: The first calculation unit includes:
6. The air conditioning control system according to claim 5, wherein a first calculation formula for estimating a suction temperature of the ICT device is calculated based on a blowing temperature of the air conditioner and an air volume blown from the air conditioner. . The second calculation unit includes:
The second calculation formula for estimating the power consumption of the air conditioner is calculated based on the temperature of the air conditioner and the amount of air blown from the air conditioner. Air conditioning control system.   In the mathematical programming method, the suction temperature of the ICT device whose stoppage is determined by the mathematical programming method is set to be equal to or lower than a second threshold value obtained by adding an arbitrary positive constant to the first threshold value. The air conditioning control system according to any one of claims 5 to 7, further comprising using a constraint condition as a conditional expression.

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