JP2020051720A - Fan control device, control method, control program, server rack and air conditioning management system - Google Patents

Abstract

To provide a fan control device which suppresses power consumption efficiently and which is for stabilizing at a temperature at which server equipment can operate comfortably, a fan control method, a fan control program, a server rack and an air conditioning management system.SOLUTION: Temperature measurement means 110 stores the temperature in a server rack 400 detected at a predetermined interval unit in storage means 140. Prediction temperature calculation means 120 calculates a prediction temperature Tf in the future from a latest temperature Tc which has been stored the latest out of the temperatures stored in the storage means 140 and a past temperature Tp stored before the latest temperature Tc stored in the storage means 140. Fan output control means 130 increases/decreases an output to a fan 300 by a difference between the prediction temperature Tf calculated by the prediction temperature calculation means 120 and a target temperature Tb.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fan control device, a fan control method, a fan control program, a server rack, and an air conditioning management system, and more particularly to a fan control device, a server rack, and a server device. The present invention relates to a fan control device, a fan control method, a fan control program, a server rack, and an air conditioning management system for controlling the operation of a fan.

  Conventionally, a computer has been known as a representative means for performing various information processing. The information processing of the computer is performed by a CPU (Central Processing Unit) which is a central processing unit provided in the computer. Also, by increasing the processing speed of the CPU, the processing capability of the computer can be increased.

  However, heat generated by improving the performance of the CPU is a problem. Therefore, in order to cool the heat generated by the CPU, there is a CPU cooler configured by combining a heat sink for promoting heat radiation, a small fan for flowing heated air, and the like. As a result, heat generated by processing information at high speed can be cooled.

  On the other hand, there is a computer called a server that realizes continuous operation of the computer close to 24 hours 365 days. In order to improve reliability and performance, this server may build a configuration in which multiple servers cooperate to process one business, and such multiple servers may be connected to routers and other connected devices. They are put together in server racks and server rooms for operation.

  In server racks and server rooms accommodating a plurality of these servers and connecting devices such as routers, stricter air-conditioning management is required to continuously operate the accommodated devices. Therefore, in such a server rack or server room, for example, an air conditioning system for an information processing equipment room as disclosed in Patent Document 1 is employed.

For example, in an air conditioning system for an information processing equipment room as disclosed in Patent Literature 1, the storage fan of a controller measures a temperature of a blower fan when a temperature measured by a temperature sensor installed in a server rack exceeds a set temperature in advance. The increment is stored.
Similarly, the storage device of the controller stores the amount of decrease in the blowing capacity of the blower fan when the temperature measured by the temperature sensor falls below the set temperature.

  The controller compares the temperature measured by the temperature sensor with the set temperature, determines whether the temperature has exceeded the set temperature, has fallen below the set temperature, or is within the set temperature range. The controller sends an output instruction signal for increasing or decreasing the capacity or maintaining the current state to the blower fan.

JP-A-2006-48150

However, in the air conditioning system for an information processing equipment room as in Patent Document 1, there is a problem that the power consumption of the blower fan is wasted.
Specifically, in the air conditioning system for an information processing equipment room disclosed in Patent Literature 1, the temperature measured by the temperature sensor is compared with a set temperature to determine whether to increase or decrease the amount of air blown by the blower fan. It does not take into account whether the temperature has changed rapidly or slowly.

  For example, before the temperature measured by the temperature sensor reaches the temperature, there may be a case where the temperature inside the server rack suddenly exceeds the set temperature or a case where the temperature inside the server rack gradually exceeds the set temperature.

  In the former case, it is necessary to increase the cooling capacity because the temperature inside the server rack may suddenly increase in the future. However, in the latter case, since the temperature is gradually rising, it is not necessary to increase the cooling capacity more than necessary.

  Conversely, even if the temperature sensor measures a temperature higher than the same set temperature, if the former and the latter are cooled by the same blower fan volume, in the former case, the temperature inside the server rack can be efficiently cooled. Can not.

  That is, even if the temperature sensor measures a temperature higher than the same set temperature in the former and the latter, the power of the blower fan required to cool the temperature in the server rack differs. For this reason, simply controlling the blowing amount of the blowing fan by comparing the temperature measured by the temperature sensor with the set temperature causes a problem that the power of the blowing fan is consumed more than necessary and a cooling capacity becomes insufficient. There was a problem.

  The present invention has been made in view of such a point, a fan control device, a fan control method, a fan control program, for efficiently suppressing power consumption and stabilizing a server device at a temperature at which it can operate comfortably. It is intended to provide a server rack and an air conditioning management system.

  In the present invention, in order to solve the above problem, a fan control device that controls the operation of a fan provided in the rack so that the temperature in the rack in which the plurality of server devices are housed becomes the target temperature. Temperature measuring means for storing the temperature in the rack detected in units of intervals in the storage means, the latest temperature stored most recently among the temperatures stored in the storage means, and the latest temperature stored in the storage means. A predicted temperature calculating means for calculating a future predicted temperature from a past temperature stored before the temperature, and an output to the fan is increased or decreased by a difference between the predicted temperature calculated by the predicted temperature calculating means and the target temperature. And a fan output control means for controlling the fan output.

  Thereby, the temperature measurement unit stores the temperature in the rack detected at a predetermined interval unit in the storage unit, and the predicted temperature calculation unit sets the most recently stored latest temperature among the temperatures stored in the storage unit, A future predicted temperature is calculated from the past temperature stored before the latest temperature stored in the storage means, and the fan output control means calculates the fan temperature based on a difference between the predicted temperature calculated by the predicted temperature calculation means and the target temperature. Increase or decrease the output to

Further, according to the present invention, in a fan control method for controlling an operation of a fan provided in a rack so that a temperature in a rack in which a plurality of server devices are stored becomes a target temperature,
Temperature measuring means for storing the temperature in the rack detected at a predetermined interval unit in the storage means, and predictive temperature calculating means for storing the latest temperature stored most recently among the temperatures stored in the storage means; Calculating a predicted temperature in the future from the past temperature stored before the latest temperature stored in the storage means, and the fan output control means controlling the predicted temperature calculated by the predicted temperature calculation means and the target Increasing or decreasing the output to the fan according to a difference from the temperature.

  Thereby, the temperature measurement unit stores the temperature in the rack detected at a predetermined interval unit in the storage unit, and the predicted temperature calculation unit sets the most recently stored latest temperature among the temperatures stored in the storage unit, A future predicted temperature is calculated from the past temperature stored before the latest temperature stored in the storage means, and the fan output control means calculates the fan temperature based on a difference between the predicted temperature calculated by the predicted temperature calculation means and the target temperature. Increase or decrease the output to

  Further, according to the present invention, in the fan control program for controlling the operation of the fan provided in the rack so that the temperature in the rack in which the plurality of server devices are stored becomes the target temperature, the computer is controlled by a predetermined interval. Temperature measuring means for storing the temperature in the rack detected in units of storage in a storage means, the latest temperature stored most recently among the temperatures stored in the storage means, and a temperature earlier than the latest temperature stored in the storage means. Predicted temperature calculating means for calculating a future predicted temperature from the past temperature stored in the memory, and fan output control for increasing or decreasing the output to the fan based on a difference between the predicted temperature calculated by the predicted temperature calculating means and the target temperature A fan control program characterized by functioning as a means is provided.

  Thereby, the temperature measurement unit stores the temperature in the rack detected at a predetermined interval unit in the storage unit, and the predicted temperature calculation unit sets the most recently stored latest temperature among the temperatures stored in the storage unit, A future predicted temperature is calculated from the past temperature stored before the latest temperature stored in the storage means, and the fan output control means calculates the fan temperature based on a difference between the predicted temperature calculated by the predicted temperature calculation means and the target temperature. Increase or decrease the output to

  Further, in the present invention, the temperature in the rack in which the plurality of server devices are stored is detected at predetermined intervals in the server rack that sets the target temperature by controlling the operation of the fan provided in the rack. Temperature measuring means for storing the temperature in the rack in a storage means; the latest temperature stored most recently among the temperatures stored in the storage means; and the temperature stored before the latest temperature stored in the storage means. Predicted temperature calculating means for calculating a future predicted temperature from the past temperature, and a fan output control means for increasing or decreasing the output to the fan by a difference between the predicted temperature calculated by the predicted temperature calculating means and the target temperature. A server rack provided with a fan control device having the following.

  Thereby, the temperature measurement unit stores the temperature in the rack detected at a predetermined interval unit in the storage unit, and the predicted temperature calculation unit sets the most recently stored latest temperature among the temperatures stored in the storage unit, A future predicted temperature is calculated from the past temperature stored before the latest temperature stored in the storage means, and the fan output control means calculates the fan temperature based on a difference between the predicted temperature calculated by the predicted temperature calculation means and the target temperature. Increase or decrease the output to

  Further, in the present invention, in the air conditioning management system of the server management room that sets the temperature of the room in which the plurality of server devices are housed to the target temperature, the temperature of the server management room detected at predetermined intervals is stored in the storage unit. Calculating a predicted temperature in the future from a temperature measurement unit, a latest temperature stored most recently among the temperatures stored in the storage unit, and a past temperature stored before the latest temperature stored in the storage unit; And a fan output control means for increasing or decreasing the output to the fan according to a difference between the predicted temperature calculated by the predicted temperature calculation means and the target temperature. An air conditioning management system is provided.

  Thereby, the temperature measurement unit stores the temperature in the rack detected at a predetermined interval unit in the storage unit, and the predicted temperature calculation unit sets the most recently stored latest temperature among the temperatures stored in the storage unit, A future predicted temperature is calculated from the past temperature stored before the latest temperature stored in the storage means, and the fan output control means calculates the fan temperature based on a difference between the predicted temperature calculated by the predicted temperature calculation means and the target temperature. Increase or decrease the output to

  According to the fan control device, the fan control method, the fan control program, the server rack, and the air conditioning management system of the present invention, the predicted temperature calculation unit measures the temperature sensor for detecting the temperature in the rack at regular intervals. The predicted temperature calculated from the latest temperature to be measured and the past temperature measured at regular intervals by the temperature sensor is calculated, and the fan output control means determines the difference between the predicted temperature calculated by the predicted temperature calculation means and the target temperature to the fan. Since the output of the server is increased or decreased, excessive power consumption for bringing the temperature in the rack close to the target temperature can be suppressed, so that the temperature can be stabilized at a temperature at which server devices can operate comfortably with energy saving.

It is a block diagram showing the concept of the fan control device concerning a 1st embodiment. FIG. 4 is a block diagram illustrating details of a predicted temperature calculating unit. FIG. 3 is a block diagram illustrating details of a fan output control unit. FIG. 3 is a block diagram illustrating details of a storage unit. FIG. 3 is a block diagram showing the structure of the entire server rack provided with the fan control device. FIG. 3 is a diagram illustrating an example of a data structure of setting value information stored in a setting value storage unit. FIG. 4 is a diagram illustrating a data structure example of temperature information stored in a past temperature storage unit. 9 is a flowchart showing a process from the time when the fan control device measures the temperature in the server rack to the time when the fan output is performed. It is a flow chart which shows processing from prediction temperature calculation means acquiring latest temperature to calculating prediction temperature. It is a flowchart which shows a process until fan output control means obtains a predicted temperature and performs fan output. It is a graph which shows an example which computed prediction temperature from the past temperature and the latest temperature. It is a graph which shows an example which computed prediction temperature from the past temperature and the latest temperature. 9 is a graph showing an example of an area to which a predicted temperature calculated from a past temperature and a latest temperature belongs. 9 is a graph showing an example of an area to which a predicted temperature calculated from a past temperature and a latest temperature belongs.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[First Embodiment]
FIG. 1 is a block diagram illustrating the concept of the fan control device according to the first embodiment.

  The outline of the present invention is to compare the temperature measured by the temperature sensor 200 with the set temperature in order to keep the temperature inside the conventional server rack at an appropriate temperature, and to set the fan when the temperature measured by the temperature sensor 200 exceeds the set temperature. The temperature inside the server rack was brought close to the set temperature by increasing the air flow of the fan and decreasing the air flow of the fan when the temperature fell below the set temperature.

  Therefore, the control device of the present invention calculates a future predicted temperature Tf from the latest temperature Tc and the past temperature Tp measured by the temperature sensor 200 installed in the server rack 400 (not shown), and sets the future predicted temperature Tf as a target. By controlling the air volume of the fan 300 so as to approach the temperature Tb, the temperature in the server rack 400 is stabilized near a preset target temperature Tb. Thus, unnecessary power can be suppressed and power consumption of the fan 300 can be reduced.

  In the present embodiment, a predicted temperature Tf in the future is calculated from the latest temperature Tc and the past temperature Tp in the server rack 400 input by the temperature sensor 200 installed in the server rack 400, and a target temperature set in advance. A case will be described in which the fan control device 100 controls the rotation speed of the fan 300 for circulating cool air in the server rack 400 so that the future predicted temperature Tf approaches Tb (40.0 ° C.).

  The temperature sensor 200 is installed at a predetermined location in the server rack 400 and senses the temperature inside the server rack 400. For example, the temperature sensor 200 uses an integrated circuit temperature sensor, a thermocouple, a thermistor, a measurement resistor, and the like. It is an electric and contact type temperature sensor.

  The fan 300 is installed at a predetermined location in the server rack 400, and circulates cool air in the server rack 400 by rotating blades provided in the fan 300, and discharges warm air generated by server heat in the server rack 400. It is a blower to make it.

Next, details of the fan control device 100 will be described.
As shown in FIG. 1, the fan control device 100 includes a temperature measurement unit 110, a predicted temperature calculation unit 120, a fan output control unit 130, and a storage unit 140. The fan control device 100 is connected to the temperature sensor 200 and the fan 300.

  The temperature measurement unit 110 is connected to the temperature sensor 200, the predicted temperature calculation unit 120, and the storage unit 140, and measures the temperature in the server rack 400 detected by the temperature sensor 200 at a predetermined measurement interval (hereinafter, referred to as a predetermined measurement interval). The fixed measurement interval unit is referred to as a measurement period (for example, a fixed measurement interval is 10 seconds, and the measurement interval of 10 seconds is represented as one measurement period).

  The temperature inside the server rack 400 measured by the temperature measuring means 110 is stored in the storage means 140 connected to the temperature measuring means 110 together with the measurement time. When the temperature measurement unit 110 completes the process of measuring the temperature inside the server rack 400 and the process of storing it in the storage unit 140, the temperature measurement unit 110 notifies the connected predicted temperature calculation unit 120 of the completion of the process.

  The predicted temperature calculation unit 120 is connected to the temperature measurement unit 110, the fan output control unit 130, and the storage unit 140, and stores the past temperature Tp in the server rack 400 stored in the storage unit 140 by the processing of the temperature measurement unit 110. This is for calculating a predicted temperature Tf in the server rack 400 from the latest temperature Tc and the latest temperature Tc.

  The predicted temperature Tf calculated by the predicted temperature calculation means 120 is notified to the connected fan output control means 130 together with the predicted time predicted to reach the future predicted temperature Tf.

  The fan output control means 130 is connected to the predicted temperature calculation means 120, the storage means 140, and the fan 300, and outputs the predicted temperature Tf calculated by the predicted temperature calculation means 120 to the target temperature stored in the storage means 140 in advance. This is for increasing or decreasing the rotation speed of the connected fan 300 so as to approach Tb.

  The storage unit 140 is connected to the temperature measurement unit 110, the predicted temperature calculation unit 120, and the fan output control unit 130, and stores the temperature in the server rack 400 measured by the temperature measurement unit 110 together with the measurement time. Further, it is a storage medium for storing information such as a target temperature Tb which is an optimum temperature for stably operating the server in the server rack 400 with energy saving.

FIG. 2 is a block diagram showing details of the predicted temperature calculating means.
As shown in FIG. 2, the predicted temperature calculation unit 120 includes a target temperature comparison unit 121, a continuity detection unit 122, and a predicted temperature calculation unit 123.

  The target temperature comparison unit 121 is connected to the continuity detection unit 122, the predicted temperature calculation unit 123, and the storage unit 140, acquires the latest temperature Tc and the target temperature Tb stored in the storage unit 140, and obtains the target temperature Tb And the latest temperature Tc.

  For example, the upper limit set value of the temperature difference that can be set arbitrarily (target temperature Tb + 0.5 ° C.) is stored in advance in the storage unit 140 as a criterion for determining whether the temperature is close to the target temperature Tb (40.0 ° C.). And the lower limit set value (target temperature Tb−0.5 ° C.), and the target temperature comparing unit 121 determines that the latest temperature Tc exceeds the lower limit set value and is lower than the upper limit set value (39.5 ° C. and 40 ° C.). .5 ° C.) or whether the latest temperature Tc is equal to or lower than the lower limit set value or equal to or higher than the upper limit set value.

  When the latest temperature Tc exceeds the lower limit set value and is lower than the upper limit set value, that is, when the latest temperature Tc is close to the target temperature Tb, the target temperature comparison unit 121 determines that the latest temperature Tc in the server rack 400 is equal to the target temperature Tb. , The target temperature comparison unit 121 notifies the predicted temperature calculation unit 123 of the latest temperature Tc.

  When the latest temperature Tc is equal to or lower than the lower limit set value or equal to or higher than the upper limit set value, that is, when the latest temperature Tc is apart from the target temperature Tb, the target temperature comparing unit 121 determines that the latest temperature Tc in the server rack 400 is the target temperature. The target temperature comparison unit 121 notifies the continuity detection unit 122 of the latest temperature Tc assuming that the distance is Tb.

  The continuity detection unit 122 is connected to the target temperature comparison unit 121, the predicted temperature calculation unit 123, and the storage unit 140, acquires the history of the past temperature Tp stored in the storage unit 140, and It is to measure how long the temperature is rising or falling continuously in the measurement period.

  The continuity detecting unit 122 notifies the temperature calculating unit 123 of the information of the continuously rising measuring period period or the continuously falling measuring period period measured by the continuity detecting unit 122.

  The predicted temperature calculation unit 123 is connected to the target temperature comparison unit 121, the continuity detection unit 122, the storage unit 140, and the fan output control unit 130, and calculates a predicted temperature Tf and a predicted temperature Tf based on the latest temperature Tc and the past temperature Tp. This is for calculating the temperature arrival time.

  Specifically, when the target temperature comparison unit 121 determines that the latest temperature Tc exceeds the lower limit set value and is lower than the upper limit set value, the target temperature comparison unit 121 compares the latest temperature Tc with the past temperature Tp [−1] one measurement period before. To calculate the predicted temperature Tf.

  The specific method of calculating the predicted temperature Tf in the above case is obtained by adding the increase / decrease value latest temperature Tc from the past temperature Tp [−1] one measurement period before to the latest temperature Tc based on the latest temperature Tc as a reference. Is calculated as the predicted temperature Tf one measurement period ahead (10 seconds ahead) from the latest temperature Tc. The specific calculation formula is calculated by the predicted temperature calculation unit 123 as predicted temperature Tf = Tc + (Tc−Tp [−1]) = 2Tc−Tp [−1].

  Here, the predicted temperature calculation unit 123 adds the increase / decrease value latest temperature Tc from the past temperature Tp [−1] one measurement period before to the latest temperature Tc based on the latest temperature Tc to the latest temperature Tc, The predicted temperature Tf is calculated as the predicted temperature Tf one measurement period ahead (10 seconds ahead), but the predicted temperature calculation unit 123 increases or decreases from the past temperature Tp [−2] two measurement periods ago to the latest temperature Tc based on the latest temperature Tc. The value added to the value latest temperature Tc may be calculated as the predicted temperature Tf two measurement periods ahead (20 seconds ahead) from the latest temperature Tc.

  When the target temperature comparison unit 121 determines that the latest temperature Tc is equal to or lower than the lower limit set value or equal to or higher than the upper limit set value, the continuity detection unit 122 determines the number of measurement periods that have continuously increased or decreased. The predicted temperature Tf is calculated taking this into account.

  A specific method of calculating the predicted temperature Tf in the above case is, for example, Tp [−5], Tp [−4], Tp [−3], Tp [−2], Tp [−1], Tc. If the temperature inside the server rack 400 continuously rises, the next temperature measurement period ahead (50 seconds ahead) from the latest temperature Tc is calculated as the predicted temperature Tf.

The specific calculation formula is calculated by the predicted temperature calculation unit 123 as predicted temperature Tf = Tc + (Tc−Tp [−1]) × 5 = 6Tc−5Tp [−1].
The predicted temperature Tf and the predicted time calculated by the predicted temperature calculation unit 123 are notified to the connected fan output control means 130.

FIG. 3 is a block diagram showing details of the fan output control means.
As shown in FIG. 3, the fan output control means 130 includes a predicted temperature comparison unit 131 and a fan output control unit 132.

  The predicted temperature comparing unit 131 is connected to the fan output control unit 132 and the predicted temperature calculating unit 120, acquires the predicted temperature Tf and the predicted time from the predicted temperature calculating unit 120, and calculates the predicted temperature Tf and the target temperature Tb. This is for comparison.

  A setting value for determining the number of revolutions of the fan 300 corresponding to the predicted temperature Tf is stored in the storage unit 140 in advance. For example, a first upper limit fan set value (target temperature Tb + 0.5 ° C.), a second upper limit fan set value (target temperature Tb + 2.0 ° C.) set at a predetermined temperature difference from the target temperature Tb (40.0 ° C.), One lower limit fan set value (target temperature Tb-0.5 ° C.) and a second lower limit fan set value (target temperature Tb-2.0 ° C.) are stored.

  In this case, the temperature range above the second upper limit fan set value (42.0 ° C.) is Area A, the first upper limit fan set value (40.5 ° C.) or higher, and the second upper limit fan set value (42.0 ° C.). ) Is the area B, the temperature area exceeding the first lower limit fan set value (39.5 ° C.) and less than the first upper limit fan set value (40.5 ° C.) is area C, the second lower limit fan Area D is a temperature range exceeding the set value (38.0 ° C.) and not more than the first lower limit fan set value (39.5 ° C.), and a temperature range not more than the second lower limit fan set value (38.0 ° C.). This will be described as area E.

  The predicted temperature comparison unit 131 compares the predicted temperature Tf with the target temperature Tb, and determines in which temperature area of the area A to the area E the predicted temperature Tf is predicted. Information on the area determined and compared by the predicted temperature comparison unit 131 is notified to the connected fan output control unit 132.

  The fan output control unit 132 is connected to the predicted temperature comparing unit 131, the fan 300, and the storage unit 140, and controls the output to the connected fan 300 based on the area determined and compared by the predicted temperature comparing unit 131. belongs to.

  For example, the output value of the fan 300 associated with each of the areas A to E is stored in the storage unit 140 in advance, and the fan output control unit 132 increases or decreases the output to the fan 300 according to the output value. .

  As an example of setting of an output value corresponding to a specific area, “Fan output + 5%” in area A, “Fan output + 1%” in area B, “Fan output current maintenance” in area C, and “Fan output current maintenance” in area D The fan output is set to "1%", and the area E is set to "fan output -2%".

  Note that the output of the fan 300 will be described as 0 to 100%. For example, the fan output in the area A is set as “fan output + 5%”, and when the current output to the fan 300 is 50%, the fan output control unit 132 rotates the fan 300 at an output of 55%. I will make it.

  As described above, by changing the number of outputs of the fan 300 depending on how much the predicted temperature Tf is different from the target temperature Tb, the predicted temperature Tf can be made closer to the target temperature Tb with a small output. In addition, the temperature inside the server rack 400 does not increase or decrease due to excessive power.

  Also, by providing an area such as area C where the output to the fan 300 is not changed near the target temperature Tb as the output to the fan 300 "maintaining the current fan output", the output change to the fan 300 is suppressed, and the temperature change is reduced. It can be changed slowly. Thereby, the temperature in the server rack 400 can be stabilized near the target temperature Tb.

  When the predicted temperature Tf is much lower than the target temperature Tb, the output of the fan 300 is lowered to prevent the temperature inside the server rack 400 from being lowered more than necessary. This makes it possible to stabilize the temperature inside the server rack 400 with the minimum required power consumption.

FIG. 4 is a block diagram illustrating details of the storage unit.
As shown in FIG. 4, the storage unit 140 includes a set value storage unit 141 and a past temperature storage unit 142.

  The setting value storage unit 141 stores setting values such as a target temperature Tb, an upper limit setting value, a lower limit setting value, a first upper limit fan setting value, a second upper limit fan setting value, a first lower limit fan setting value, and a second lower limit fan setting value. Is a storage area for storing.

  The past temperature storage unit 142 is a storage area for recording the latest temperature Tc in the server rack 400 measured by the temperature measurement unit 110 along with the measurement time. As the latest temperature Tc is additionally recorded in the past temperature storage section 142, the latest temperature Tc already stored in the past temperature storage section 142 is stored as the past temperature Tp with the newly added latest temperature Tc. Will be done.

FIG. 5 is a block diagram showing the overall structure of a server rack provided with a fan control device.
As shown in FIG. 5, the server rack 400 includes a plurality of server devices 410, a heat exchanger 420, a sealed exterior wall 430, a fan control device 100, a temperature sensor 200, and a fan 300.

  The server device 410 is, for example, a rack-mounted server or a storage, and is fixed in the server rack 400 at a predetermined interval and in a fixed direction. Further, the server device 410 generates a different amount of heat depending on the operation status of each device. The server device 410 may be a network device such as a router, a switching hub, or a patch panel, or a power supply device such as an uninterruptible power supply.

  The heat exchanger 420 is, for example, a water-cooled radiator, in which cold water of a constant temperature is poured into the heat exchanger 420, and the amount of heat generated by the plurality of server devices 410 in the server rack 400 is a heat exchanger. The cold water exchanged by the 420 and poured into the heat exchanger 420 becomes hot water after the heat exchange, and is discharged.

  A fan control device 100, a temperature sensor 200, and a fan 300 are installed near the heat exchanger 420. The air in the server rack 400 is circulated by the rotation of the fan 300, and the heat exchanger 420 The heat inside 400 is exchanged and discharged outside server rack 400.

  The fan 300 is provided in a part of a cold aisle indicated by a white arrow provided in front of the server device 410 installed in a certain direction, and a heat exchanger 420 provided on an intake side of the fan 300. When the fan 300 rotates, the cooled air can flow into the cold aisle provided in front of each server device 410.

  The cool air that has flowed into the cold aisle cools the heat generated by each server device 410 from the front side of each server device 410 with a fan or the like provided in each server device 410, and the hot air provided behind each server device 410. Air heated in the aisle is discharged. The warmed air discharged to the hot aisle is cooled again by the heat exchanger 420 and circulated to the cold aisle in the server rack 400 by the operation of the fan 300.

  The hermetic exterior wall 430 is provided on the outer periphery of the server rack 400, and includes a plurality of server devices 410, heat exchangers 420, hermetic exterior walls 430, a fan control device 100, a temperature sensor 200, and a hermetic housing for the fan 300. It is an exterior wall. The sealed exterior wall 430 prevents the cooled air from leaking to the outside, so that the server device 410 can be efficiently cooled in the closed space inside the enclosed exterior wall 430.

FIG. 6 is a diagram illustrating a data structure example of the setting value information stored in the setting value storage unit.
As shown in FIG. 6, the setting value storage unit 141 stores setting items and setting values in association with each other.

In the target temperature column, a temperature at which the server device 410 can operate comfortably and energy-saving in the server rack 400 is set.
In the upper limit set value column and the lower limit set value column, an upper limit value and a lower limit value which are criteria for determining whether the latest temperature Tc is a temperature close to or distant from the target temperature Tb are set. In FIG. 6, the difference between the target temperature Tb and the target temperature Tb is set, such as “target temperature Tb + 0.5 ° C.”. However, the temperature that is the upper limit or the lower limit can be directly set.

  In the fan setting value column, the condition of the fan output value for rotating the fan 300 based on the difference between the calculated expected temperature and the target temperature Tb is set. In FIG. 6, the difference between the target temperature Tb and the fan output is set such as “target temperature Tb + 0.5 ° C.” or “fan output 5%”, but the boundary temperature and the output value of the fan 300 are directly set. You can also.

FIG. 7 is a diagram illustrating an example of a data structure of temperature information stored in a past temperature storage unit.
As shown in FIG. 7, the past temperature storage unit 142 stores the measured time and the measured temperature in association with each other.

  In the measurement time column, the time at which the temperature measurement unit 110 measures the temperature in the server rack 400 via the temperature sensor 200, and in the measurement temperature column, the temperature measurement unit 110 uses the server rack 400 via the temperature sensor 200. The temperature measured inside is set.

  FIG. 8 is a flowchart illustrating a process from when the fan control device measures the temperature in the server rack to when the fan output is performed. Hereinafter, the processing illustrated in FIG. 8 will be described along with step numbers.

[Step S11]
The fan control device 100 measures the latest temperature Tc. Specifically, the temperature measurement unit 110 provided in the fan control device 100 measures the latest temperature Tc in the server rack 400 via the temperature sensor 200 and causes the storage unit 140 to store the latest temperature Tc.

[Step S12]
The fan control device 100 calculates the predicted temperature Tf. Specifically, the predicted temperature calculation means 120 provided in the fan control device 100 calculates a predicted temperature Tf in the future from the latest temperature Tc and the past temperature Tp stored in the storage means 140.

[Step S13]
The fan control device 100 performs a fan output. Specifically, the fan output control means 130 included in the fan control device 100 performs a fan output on the fan 300 such that the predicted temperature Tf approaches the target temperature Tb based on the predicted temperature Tf calculated in step S12.

FIG. 9 is a flowchart showing a process from when the predicted temperature calculating means obtains the latest temperature to when the predicted temperature Tf is calculated. Hereinafter, the processing illustrated in FIG. 9 will be described along with step numbers.
[Step S21]
The predicted temperature calculation means 120 determines whether the acquired latest temperature Tc is a temperature close to the target temperature Tb or whether the latest temperature Tc is a temperature apart from the target temperature Tb. Specifically, the target temperature comparing unit 121 compares the latest temperature Tc with a temperature close to the target temperature Tb or compares the latest temperature with the upper limit set value and the lower limit set value set in the storage unit 140 in advance. It is determined whether Tc is a temperature apart from target temperature Tb.

  When the predicted temperature calculating means 120 determines that the latest temperature Tc is close to the target temperature Tb, the process proceeds to step S22, and the predicted temperature calculating means 120 determines that the temperature at which the latest temperature Tc is apart from the target temperature Tb. If it is determined that the process is executed, the process proceeds to step S25.

[Step S22]
The predicted temperature calculation means 120 acquires the past temperature Tp [-1] one measurement period before. Specifically, the predicted temperature calculation unit 123 included in the predicted temperature calculation unit 120 acquires the past temperature Tp [−1] one measurement period before the past temperature Tp stored in the storage unit 140.

[Step S23]
The predicted temperature calculating means 120 calculates a difference between the latest temperature Tc and the past temperature Tp [-1] one measurement period before. Specifically, the predicted temperature calculation unit 123 included in the predicted temperature calculation unit 120 subtracts the past temperature Tp [−1] from the latest temperature Tc stored in the storage unit 140 to calculate a difference.

[Step S24]
The predicted temperature calculation means 120 calculates a predicted temperature Tf one measurement period ahead. Specifically, the predicted temperature calculation unit 123 included in the predicted temperature calculation unit 120 calculates the predicted temperature Tf one measurement period ahead by adding the difference calculated in step S23 to the latest temperature Tc.

[Step S25]
The predicted temperature calculation means 120 initializes a counter n. Specifically, the continuity detecting unit 122 included in the predicted temperature calculating unit 120 initializes the counter n by substituting 0 into the counter n for counting the continuous measurement periods.

[Step S26]
The predicted temperature calculation means 120 increases the counter n by one. Specifically, the continuity detection unit 122 included in the predicted temperature calculation unit 120 adds 1 to a counter n for counting continuous measurement periods and increases the count by one.

[Step S27]
The predicted temperature calculation means 120 acquires the past temperature Tp [-n] one measurement period before. Specifically, the continuity detection unit 122 included in the predicted temperature calculation unit 120 acquires the past temperature Tp [−n] before the n measurement period from the past temperature Tp stored in the storage unit 140.

[Step S28]
The predicted temperature calculation means 120 determines whether or not the counter n is 2 or more. Specifically, the continuity detecting unit 122 included in the predicted temperature calculating unit 120 determines whether or not the counter n is 2 or more to determine whether or not there is a target for comparing continuity.

  When the continuity detecting unit 122 determines that the counter n is 2 or more, the process proceeds to step S26. When the continuity detecting unit 122 determines that the counter n is not 2 or more, the process proceeds to step S29. Proceed to

[Step S29]
The predicted temperature calculation means 120 compares the temperature from Tp [−n] to the latest temperature Tc. Specifically, the continuity detection unit 122 included in the predicted temperature calculation unit 120 determines whether the latest temperature Tc stored in the storage unit 140 is the past temperature Tp [−1] or the past temperature Tp [−n] is the past temperature Tp. By subtracting [-n + 1] and calculating the difference, the temperature change in each measurement period is compared.

[Step S30]
The predicted temperature calculation means 120 determines the continuity of the temperature change. Specifically, the continuity detection unit 122 included in the predicted temperature calculation unit 120 determines whether there is a continuous temperature increase or a continuous temperature decrease based on the temperature change in each measurement period processed in step S29. Determine the gender.

  When the continuity detecting unit 122 determines that there is a continuous temperature rise or a continuous temperature drop, the process proceeds to step S26, and the continuity detecting unit 122 determines that there is a continuous temperature rise or a continuous temperature drop. If it is determined that there is no downward movement, the process proceeds to step S31.

[Step S31]
The predicted temperature calculating means 120 calculates the predicted temperature Tf ahead of the n-1 measurement period. Specifically, the predicted temperature calculation unit 123 included in the predicted temperature calculation unit 120 adds n−1 to the difference obtained in step S27 when the latest temperature Tc is n = 1, thereby obtaining n -1 Calculate the predicted temperature Tf ahead of the measurement period.

  In the flowchart illustrated in FIG. 9, the continuity detecting unit 122 determines whether or not there is continuity by comparing the previous time without an upper limit in step S29. It is also possible to set an upper limit of the continuity judgment, for example, to judge the continuity up to nine measurement periods.

  FIG. 10 is a flowchart showing a process from when the fan output control unit acquires the predicted temperature to when the fan output is performed. Hereinafter, the processing illustrated in FIG. 10 will be described along with step numbers.

[Step S41]
The fan output control means 130 determines which area the acquired predicted temperature Tf belongs to. Specifically, the predicted temperature comparison unit 131 included in the fan output control unit 130 stores the first upper fan setting value, the second upper fan setting value, the first lower fan setting value, and the second upper fan setting value stored in the storage unit 140. It is determined to which temperature area the obtained predicted temperature Tf belongs to among the temperature areas of the areas A to E partitioned by the lower limit fan set value.

  When the predicted temperature comparison unit 131 determines that the acquired predicted temperature Tf belongs to the area A, the process proceeds to step S42, and the predicted temperature comparison unit 131 determines that the acquired predicted temperature Tf belongs to the area B. In this case, the process proceeds to step S43, and when the predicted temperature comparison unit 131 determines that the acquired predicted temperature Tf belongs to the area C, the process proceeds to step S44, and the predicted temperature comparison unit 131 If it is determined that the acquired predicted temperature Tf belongs, the process proceeds to step S45. If the predicted temperature comparison unit 131 determines that the acquired predicted temperature Tf belongs to the area E, the process proceeds to step S46.

[Step S42]
The fan output control means 130 performs the fan output of the present value + 5%. Specifically, the fan output control unit 132 included in the fan output control unit 130 performs + 5% fan output from the currently output fan output.

[Step S43]
The fan output control means 130 outputs the current value + 1% of the fan output. Specifically, the fan output control unit 132 included in the fan output control unit 130 performs + 1% fan output from the currently output fan output.

[Step S44]
The fan output control means 130 outputs the fan while maintaining the current value. Specifically, the fan output control unit 132 included in the fan output control unit 130 performs the fan output while maintaining the currently output fan output.

[Step S45]
The fan output control means 130 outputs the current value of -1%. Specifically, the fan output control unit 132 included in the fan output control means 130 performs -1% fan output from the currently output fan output.

[Step S46]
The fan output control means 130 outputs the current value of −2%. Specifically, the fan output control unit 132 included in the fan output control unit 130 performs a fan output of −2% from the currently output fan output.

FIG. 11 is a graph showing an example of calculating a predicted temperature from a past temperature and a latest temperature.
As shown in FIG. 11 (A), the latest temperature Tc exceeds a lower limit set value indicating a state close to the target temperature Tb and is smaller than an upper limit set value (exceeds 39.5 ° C. and less than 40.5 ° C.). It is measured around 25 ° C, which is outside the range.

  In this case, the target temperature comparison unit 121 included in the predicted temperature calculation unit 120 determines that the latest temperature Tc is a temperature apart from the target temperature Tb, and the continuity detection unit 122 determines the continuity of temperature rise or fall. I do.

  At this time, the continuity detecting unit 122 increases the temperature continuously for five measurement periods from the latest temperature Tc to the past temperature Tp [−5], but changes the past temperature Tp [−5] to the past temperature Tp. It is determined that the temperature is decreasing toward [-6].

  As a result, the predicted temperature calculation unit 123 included in the predicted temperature calculation means 120 sets the predicted temperature Tf five periods ahead of the latest temperature Tc as the predicted temperature Tf, and indicates a rising period that is continuous with the difference ΔT between the latest temperature Tc and the past temperature Tp [−1]. A predicted temperature Tf around 33 ° C. is calculated by adding the value obtained by multiplying by 5 / min to the latest temperature Tc.

As shown in FIG. 11B, the latest temperature Tc exceeds a lower limit set value indicating a state close to the target temperature Tb and is smaller than an upper limit set value (exceeds 39.5 ° C. and less than 40.5 ° C.). It is measured at around 39 ° C.
In this case, the target temperature comparison unit 121 included in the predicted temperature calculation means 120 determines that the latest temperature Tc is close to the target temperature Tb.

  Accordingly, the predicted temperature calculation unit 123 included in the predicted temperature calculation unit 120 sets the difference ΔT between the latest temperature Tc and the past temperature Tp [−1] to the latest temperature Tc, with one measurement period ahead of the latest temperature Tc as the predicted temperature Tf. Then, a predicted temperature Tf around 41 ° C. is calculated.

FIG. 12 is a graph showing an example of calculating the predicted temperature from the past temperature and the latest temperature.
As shown in FIG. 12A, the latest temperature Tc exceeds a lower limit set value indicating a state close to the target temperature Tb and is smaller than an upper limit set value (exceeds 39.5 ° C. and less than 40.5 ° C.). It is measured around 41 ° C, which is outside the range.

  In this case, the target temperature comparison unit 121 included in the predicted temperature calculation unit 120 determines that the latest temperature Tc is a temperature apart from the target temperature Tb, and the continuity detection unit 122 determines the continuity of temperature rise or fall. I do.

  At this time, the continuity detection unit 122 continuously lowers the temperature for three measurement periods from the latest temperature Tc to the past temperature Tp [−3], but from the past temperature Tp [−3] to the past temperature Tp [ -4], it is determined that the temperature has risen.

  As a result, the predicted temperature calculation unit 123 included in the predicted temperature calculation means 120 sets the predicted temperature Tf three periods ahead of the latest temperature Tc as the predicted temperature Tf, and the rising period that is continuous with the difference ΔT between the latest temperature Tc and the past temperature Tp [−1]. A predicted temperature Tf around 38 ° C. is calculated by adding the product of the third and the third to the latest temperature Tc.

As shown in FIG. 12B, the latest temperature Tc exceeds a lower limit set value indicating a state close to the target temperature Tb and is smaller than an upper limit set value (exceeds 39.5 ° C. and less than 40.5 ° C.). It is measured at around 41 ° C.
In this case, the target temperature comparison unit 121 included in the predicted temperature calculation means 120 determines that the latest temperature Tc is close to the target temperature Tb.

  Accordingly, the predicted temperature calculation unit 123 included in the predicted temperature calculation unit 120 sets the difference ΔT between the latest temperature Tc and the past temperature Tp [−1] to the latest temperature Tc, with one measurement period ahead of the latest temperature Tc as the predicted temperature Tf. Then, a predicted temperature Tf around 41 ° C. is calculated.

FIG. 13 is a graph showing an example of the area to which the predicted temperature calculated from the past temperature and the latest temperature belongs.
As shown in FIG. 13A, the predicted temperature Tf calculated by the predicted temperature calculating means 120 is predicted around 35 degrees.

  At this time, the predicted temperature comparison unit 131 included in the fan output control unit 130 determines that the predicted temperature Tf belongs to the area E, which is a temperature region where the predicted temperature Tf is equal to or lower than the second upper limit fan set value (38.0 ° C.). to decide.

  Next, the fan output control unit 132 included in the fan output control unit 130 outputs to the fan 300 with an output (current value -2%) corresponding to the area E stored in the storage unit 140 in advance.

  Thus, the fan 300 can bring the temperature inside the server rack 400 closer to the target temperature Tb with less energy than the currently output fan output value. That is, it is possible to approach the target temperature Tb, which is a temperature at which the server device 410 can operate stably with less energy.

As shown in FIG. 13B, the predicted temperature Tf calculated by the predicted temperature calculating means 120 is predicted around 41 degrees.
At this time, the predicted temperature comparison unit 131 included in the fan output control means 130 determines that the predicted temperature Tf is equal to or more than the first upper limit fan set value (40.5 ° C.) and less than the second upper limit fan set value (42.0 ° C.). It is determined that the predicted temperature Tf belongs to the area B which is the temperature area.

  Next, the fan output control unit 132 included in the fan output control unit 130 outputs to the fan 300 with an output (current value + 1%) corresponding to the area B stored in the storage unit 140 in advance.

  Thus, the fan 300 can bring the temperature in the server rack 400 closer to the target temperature Tb without excessively outputting the fan output value currently output. That is, it is possible to approach the target temperature Tb, which is a temperature at which the server device 410 can operate stably with less energy.

FIG. 14 is a graph showing an example of the area to which the predicted temperature calculated from the past temperature and the latest temperature belongs.
As shown in FIG. 14A, the predicted temperature Tf calculated by the predicted temperature calculating means 120 is predicted around 39 degrees.

  At this time, the predicted temperature comparison unit 131 included in the fan output control unit 130 determines that the predicted temperature Tf exceeds the second lower limit fan set value (38.0 ° C.) and the first lower limit fan set value (39.5 ° C.) It is determined that the predicted temperature Tf belongs to the area D which is the following temperature region.

  Next, the fan output control unit 132 included in the fan output control unit 130 outputs to the fan 300 with an output (current value -1%) corresponding to the area D stored in the storage unit 140 in advance.

  Thus, the fan 300 can bring the temperature inside the server rack 400 closer to the target temperature Tb with less energy than the currently output fan output value. That is, it is possible to approach the target temperature Tb, which is a temperature at which the server device 410 can operate stably with less energy.

As shown in FIG. 14B, the predicted temperature Tf calculated by the predicted temperature calculation means 120 is predicted at around 40 degrees.
At this time, the predicted temperature comparison unit 131 included in the fan output control means 130 determines that the predicted temperature Tf exceeds the first lower limit fan set value (39.5 ° C.) and the first upper limit fan set value (40.5 ° C.) It is determined that the predicted temperature Tf belongs to the area C which is a temperature region of less than or equal to.

  Next, the fan output control unit 132 included in the fan output control unit 130 performs an output to the fan 300 with an output corresponding to the area C stored in the storage unit 140 in advance (maintaining the current fan output).

  As a result, the fan 300 does not output excessively from the currently output fan output value, and also reduces the temperature inside the server rack 400 by reducing the fan output from the currently output fan output value. Can be prevented. That is, it is possible to approach the target temperature Tb, which is a temperature at which the server device 410 can operate stably with less energy.

  In the present embodiment, the operation of the server device 410 in the server rack 400 by the heat exchanger 420, the fan 300, the temperature sensor 200, and the fan control device 100 installed in the space sealed by the sealed exterior wall 430. The fan 300, the temperature sensor 200, and the fan control device 100 are installed in the vicinity of each server device 410 in the server rack 400 composed of an unsealed perforated exterior wall or the like. Then, the plurality of fans 300, the temperature sensor 200, and the fan control device 100 may suppress the temperature rise by each server device 410.

  Further, in the present embodiment, by installing fan 300, temperature sensor 200, and fan control device 100 in server rack 400, the temperature in server rack 400 is stabilized at a temperature at which server device 410 can operate comfortably. As described above, for example, the fan 300, the temperature sensor 200, and the fan control device 100 are installed in a closed space such as a server device management room where a plurality of server racks 400 each including the server device 410 are installed, and the server device management is performed. The temperature rise by each server device 410 installed in a closed space such as a room may be suppressed.

REFERENCE SIGNS LIST 100 fan control device 110 temperature measurement unit 120 predicted temperature calculation unit 121 target temperature comparison unit 122 continuity detection unit 123 predicted temperature calculation unit 130 fan output control unit 131 predicted temperature comparison unit 132 fan output control unit 140 storage unit 141 set value storage Unit 142 Past temperature storage unit 200 Temperature sensor 300 Fan 400 Server rack 410 Server device 420 Heat exchanger 430 Sealed exterior wall Tb Target temperature Tc Latest temperature Tf Predicted temperature Tp Past temperature n Counter ΔT Difference

Claims (11)

A fan control device that controls operation of a fan provided in the rack so that a temperature in a rack in which a plurality of server devices is stored becomes a target temperature,
Temperature measuring means for storing in the storage means the temperature in the rack detected at a predetermined interval unit,
Predicted temperature calculating means for calculating a predicted temperature in the future from the latest temperature stored most recently among the temperatures stored in the storage means and the past temperature stored before the latest temperature stored in the storage means When,
Fan output control means for increasing or decreasing the output to the fan by a difference between the predicted temperature calculated by the predicted temperature calculation means and the target temperature,
A fan control device comprising: The predicted temperature calculation means,
A temperature difference from the latest temperature to a past temperature that is traced back by an arbitrary interval unit from the latest temperature to the latest temperature, and a temperature added to the latest temperature as the predicted temperature after the arbitrary interval unit,
The fan control device according to claim 1, wherein: The arbitrary interval unit is:
One interval unit,
The fan control device according to claim 2, wherein: The predicted temperature calculation means,
Target temperature comparing means for determining whether or not the latest temperature belongs to an adjacent temperature region provided with a constant temperature difference from the target temperature,
A plurality of past temperatures that have been successively traced back to the past sequentially from the latest temperature, and a continuous count detecting unit that detects a continuous count of an interval unit that has continuously increased or decreased,
With
If the target temperature comparing means determines that the latest temperature belongs to the preceding proximity temperature range, the predicted temperature calculating means calculates the predicted temperature one interval unit ahead,
If the target temperature comparing means determines that the latest temperature does not belong to the proximity temperature region, the predicted temperature calculating means is the number of consecutive times detected by the continuous number detecting means from the time of obtaining the latest temperature. Calculating the predicted temperature of
3. The fan control device according to claim 2, wherein: The continuity measurement means
A limit value is set for the number of times of measuring the continuous interval unit, and
The fan control device according to claim 4, wherein: On the intake side of the fan,
A heat exchange device for cooling the air in the rack,
The fan control device according to claim 1, further comprising: The rack is
It has a closed structure that does not allow outside air to enter,
The fan control device according to claim 1, wherein: A fan control method for controlling an operation of a fan provided in the rack so that a temperature in a rack containing a plurality of server devices becomes a target temperature,
Temperature measuring means for storing in the storage means the temperature in the rack detected at a predetermined interval unit,
The predicted temperature calculation means calculates a predicted future temperature from the latest temperature stored most recently among the temperatures stored in the storage means and the past temperature stored before the latest temperature stored in the storage means. Calculating,
Fan output control means for increasing or decreasing the output to the fan by a difference between the predicted temperature calculated by the predicted temperature calculation means and the target temperature,
A fan control method comprising: In a fan control program for controlling the operation of a fan provided in the rack so that the temperature in the rack in which the plurality of server devices are stored becomes the target temperature,
Computer
Temperature measurement means for storing in the storage means the temperature in the rack detected at a predetermined interval unit,
Predicted temperature calculating means for calculating a predicted temperature in the future from the latest temperature stored most recently among the temperatures stored in the storage means and the past temperature stored before the latest temperature stored in the storage means ,
Fan output control means for increasing or decreasing the output to the fan by a difference between the predicted temperature calculated by the predicted temperature calculation means and the target temperature,
A fan control program characterized by functioning as a fan. In a server rack in which a temperature in a rack containing a plurality of server devices is set to a target temperature by controlling an operation of a fan provided in the rack,
Temperature measuring means for storing in the storage means the temperature in the rack detected at a predetermined interval unit,
Predicted temperature calculating means for calculating a predicted temperature in the future from the latest temperature stored most recently among the temperatures stored in the storage means and the past temperature stored before the latest temperature stored in the storage means When,
Fan output control means for increasing or decreasing the output to the fan by a difference between the predicted temperature calculated by the predicted temperature calculation means and the target temperature,
A fan control device having
A server rack comprising: In an air conditioning management system that sets the temperature of the room where multiple server devices are stored to the target temperature,
Temperature measuring means for storing the temperature of the server management room detected at predetermined intervals in a storage means,
Predicted temperature calculating means for calculating a predicted temperature in the future from the latest temperature stored most recently among the temperatures stored in the storage means and the past temperature stored before the latest temperature stored in the storage means When,
Fan output control means for increasing or decreasing the output to the fan by a difference between the predicted temperature calculated by the predicted temperature calculation means and the target temperature,
A fan control device having
An air-conditioning management system comprising: