JP2002006992A - Cooling system and method for underfloor air conditioning system computer, and storage medium recorder cooling control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To always keep the most suitable constant air-quantity inside a computer by controlling rotational speed of a fan, even if there is a flow change of an underfloor chill, and to indicate an air blasting state. SOLUTION: A section 51 for calculating average air-quantity, calculates an average air- quantity value from respective air-quantity values of sections 4A to 4D for detecting air- quantity. In a section 53 for setting air-quantity, a setting value is set. A section 52 for comparing, determines a difference level suing the difference between the average value and the setting value, to send an difference level signal, to update when the difference level changes during definite period of time. A section 54 for generating fan drive signal, generates a fan drive signal to control the rotational speed of the fans 2A to 2D when receiving difference information. A fan drive circuit 3 drives the fans 2A to 2D with the fan drive signal uniformly. In the case there is not the update after the definite period of time has passed, a monitoring timer 55 outputs an alarm level signal corresponding to the difference level signal received at the time. A section 6 for indicating alarm, indicates in response to the alarm level signal. The system is provided with the average air quantity calculating section 51, the air-quantity setting section 53, the comparing section 52, the fan drive signal generating section 54, the fan drive section 3, the monitoring timer 55 and the alarm indicating section 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling system, a method and a recording medium for recording a cooling control program for an underfloor air conditioning computer. The present invention relates to a cooling method and method for an underfloor air-conditioning type computer which sends a cooling medium into a computer installed above the floor, and a recording medium storing a cooling control program.

[0002]

2. Description of the Related Art Conventionally, in order to cool an underfloor air-conditioning computer, a fan provided inside the computer sucks air-conditioning cool air under the floor from an opening provided in the floor. At that time, the fan inside the computer is separated from the underfloor air-conditioning cool air, and there is usually a gap between the computer bottom surface and the floor, so that the underfloor air-conditioning cool air cannot be efficiently taken in. In addition, a computer can be installed in consideration of the amount and direction of air-conditioning cool air flowing under the floor,
Alternatively, it is necessary to change the flow of the air-conditioning cool air under the floor using a device called a fin or a damper.

As an example in which a fan is provided not on the inside of a computer but on a part of a free access floor, there is an "air-conditioning air blowing unit" disclosed in Japanese Utility Model Laid-Open Publication No. Hei 7-26646. In this publication, an air blowing unit is combined with a part of a free access floor whose lower part is used as a passage for air conditioning air, and a fan built in the air blowing unit blows air from the floor below the floor. Techniques are disclosed.

[0004]

SUMMARY OF THE INVENTION
The conventional technique disclosed in Japanese Patent No. 6646 has the following problem.

[0005] The first problem is that the fan installed on the floor rotates at a constant speed and only blows air, so that one type of unit can flexibly cope with the air volume required by each computer. Is not possible. In addition, since the air conditioner normally performs automatic air volume control, the flow rate of air-conditioning cool air flowing under the floor changes with the passage of time. As a result, a constant air volume cannot always be secured.
As a result, there is a problem that a change in temperature inside the computer occurs, stress is applied to the computer element, and this causes a failure of the computer.

[0006] The second problem is that it is impossible to determine whether or not the cool air is correctly sent to the inside of the computer because the state of air blowing cannot be confirmed from the outside.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cooling method and method for an underfloor air-conditioning computer which solves the above problems, and a recording medium which records a cooling control program.

[0008]

According to a first aspect of the present invention, there is provided a cooling system for an underfloor air-conditioning computer for cooling the inside of a computer installed on a free access floor. Means for calculating an average value of the airflow detected by a plurality of airflow detection units provided inside the computer as an average airflow value, and comparing the average airflow value with a preset airflow value to eliminate a difference therebetween. And means for uniformly controlling the rotational speeds of a plurality of fans built into the floor, and means for displaying the state of the difference in multiple stages according to the amount of difference.

A second cooling method for an underfloor air-conditioning computer according to the present invention is a method for cooling an underfloor air-conditioning computer that cools the inside of a computer installed on a free access floor, wherein the free access is provided immediately below the computer. A plurality of fans that are built into the floor floor and blow underfloor air-conditioning cool air into the computer;
A plurality of air volume detectors provided at different locations inside the computer to detect air volume values at the respective locations, and obtain respective air volume values from the plurality of air volume detectors, and calculate an average air volume value thereof. An average air volume calculating unit to calculate, an air volume setting unit that presets and holds an optimal air volume value inside the computer as a set air volume value, and an average air volume value acquired from the average air volume calculating unit and the air volume setting unit. A comparison unit that compares the acquired set airflow value and detects the difference, and a fan that receives difference information from the comparison unit and generates a fan drive signal that controls the rotation speed of the fan so as to eliminate the difference. A driving signal generating unit; and a fan driving circuit that uniformly drives the plurality of fans according to a fan driving signal received from the fan driving signal generating unit.

[0010] In a third aspect of the present invention, in the cooling method of the second underfloor air-conditioning computer, the comparing section is further configured such that the difference is divided into a plurality of levels in advance. The difference level signal sent to the monitoring timer when the difference level changes within a predetermined time, and the comparing unit If the difference level signal has not been updated from the comparing unit even after the predetermined time has passed after receiving the difference level signal from the controller, an alarm level signal corresponding to the difference level signal received at that time is output as an alarm. A monitoring timer to be sent to a display unit; and a display unit for each of the alarm level signals. Further and a alarm display unit to be displayed on that display unit.

[0011] A fourth aspect of the present invention is a cooling method for an underfloor air-conditioning computer which cools the inside of a computer installed on a free access floor. The computer has the same number of airflow detection units as the number of the fans in the computer, and the airflow value detected by each of the airflow detection units and the airflow detection units set in advance for each of the airflow detection units are provided. Means for individually comparing the set airflow values with each other and individually controlling the rotation speeds of the respective fans so as to eliminate the respective differences, and for each of the airflow detectors according to the difference amounts, the state of the respective differences. Means for displaying in stages.

[0012] A fifth aspect of the present invention is a cooling method for an underfloor air-conditioning computer for cooling the inside of a computer installed on a free access floor, wherein the free access directly below the computer is provided. A plurality of fans that are built into the floor floor and blow underfloor air-conditioning cool air into the computer;
A plurality of air volume detection units are provided in the computer corresponding to each of the fans and the same number as the number of the fans, and detect an air volume value of the corresponding fan, and set an optimal air volume value for each of the air volume detection units. As the value, an air volume setting unit previously set and held corresponding to each of the air volume detection units, a respective air volume value obtained from each of the air volume detection units, and each of the air volume detection units obtained from the air volume setting unit A comparison unit that compares the set airflow value of each with and individually detects each difference,
A fan drive signal generation unit that receives the respective difference information from the comparison unit and generates a fan drive signal that individually controls the rotation speed of each fan corresponding to each of the air volume detection units so as to eliminate these differences; A fan drive circuit that individually drives a corresponding fan according to each fan drive signal received from the fan drive signal generation unit.

A sixth aspect of the present invention provides a cooling method for an underfloor air-conditioning computer according to the fifth aspect of the present invention, wherein the comparing section further classifies the difference into multiple levels in advance. The difference level signal sent to the monitoring timer is sent to the monitoring timer for each of the air volume detection units, and the difference level signal sent to the monitoring timer when the difference level changes within a predetermined time is determined. While updating for each of the air volume detection units, and receiving the respective difference level signals from the comparison unit, even if the predetermined time has elapsed, if there is no update of the difference level signal from the comparison unit, A monitoring timer for sending an alarm level signal corresponding to a difference level signal for each of the air flow rate detection units to the alarm display unit; A display unit for each alarm level signal further includes a alarm display unit for displaying on the display unit said corresponding with receiving an alarm level signal for each air volume detecting unit from the monitoring timer.

In a seventh aspect of the present invention, in the cooling method of the third or sixth underfloor air-conditioning computer according to the present invention, the comparing section includes a differential level having a minimum level of the differential level. In the case of, it is not sent to the monitoring timer, and the alarm display is not performed.

A first method of cooling an underfloor air-conditioning computer according to the present invention is a method of cooling an underfloor air-conditioning computer that cools the inside of a computer installed on a free access floor, the method being provided inside the computer. A plurality of air volume detection units detect the air volume, calculate the average value of the detected air volumes as an average air volume value, compare the average air volume value with a preset air volume value, and eliminate the difference. In addition, the rotational speeds of a plurality of fans built into the floor are uniformly controlled, and the state of the difference is displayed in multiple stages according to the difference amount.

A second method of cooling an underfloor air-conditioning computer according to the present invention is a method of cooling an underfloor air-conditioning computer that cools the inside of a computer installed on a free access floor. A first step of setting and holding a value as a set airflow value in advance, a second step of detecting respective airflows by a plurality of airflow detection units provided inside the computer, and the second step. A third step of calculating, as an average airflow value, an average value of the respective airflows detected in the step;
A fourth step of comparing the average airflow value with the preset airflow value set in the first step to calculate a difference between the average airflow value and the set airflow value set in advance in the first step; and uniformly controlling the rotation speeds of the plurality of fans to eliminate the difference. A fifth step of controlling, a sixth step of determining which of the difference levels the difference is divided into in advance in multiple stages, and a predetermined time after holding the difference level determined in the sixth step. During the second
A seventh step of repeating the operation of the sixth step; and, if the difference level has changed within the fixed time, updating and holding the difference level. The method includes an eighth step of repeating the operation of step 6, and a ninth step of, after the lapse of the predetermined time, displaying a display corresponding to the difference level held at that time.

A third method of cooling an underfloor air-conditioning computer according to the present invention is a method of cooling an underfloor air-conditioning computer that cools the inside of a computer installed on a free access floor. The air flow from each fan is detected by a corresponding air flow detection unit, and each detected air flow value is compared with a preset air flow value set in advance for each air flow detection unit.
The rotation speed of each fan is individually controlled so as to eliminate each difference, and the state of each difference is displayed in multiple stages for each of the air volume detection units according to the difference amount.

A fourth method of cooling an underfloor air-conditioning computer according to the present invention is a method of cooling an underfloor air-conditioning computer that cools the inside of a computer installed on a free access floor, the method being provided inside the computer. A first step of preliminarily setting and holding an optimum airflow value as a set airflow value for each of the plurality of airflow detection units, a second step of detecting each airflow by the plurality of airflow detection units, A third step of comparing each of the airflow values detected in the second step with a preset airflow value for each of the airflow detection units set in advance in the first step, and individually calculating a difference therebetween; A fourth step of individually controlling the rotational speeds of the fans so as to eliminate the differences, and a difference level in which the differences are divided into multiple levels in advance. A fifth step of determining for each of the air volume detecting unit configured to determine, after holding the fifth difference level of each of the air volume detection unit is determined in the step of, during the predetermined time,
A sixth step of repeating the operations of the second to fifth steps, and, when the difference level changes within the fixed time, updating and holding the difference level for each of the air flow rate detection units; A seventh step of repeating the operations of the second to fifth steps for a predetermined time, and after the lapse of the predetermined time, a display corresponding to the difference level held at that time is performed for each of the air volume detection units. And an eighth step.

The recording medium of the present invention is characterized by recording a cooling control program for causing a computer to execute the second or fourth method of cooling a computer under the floor according to the present invention.

[0020]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing an example of use of the first embodiment of the present invention. Referring to FIG. 1, an underfloor air-conditioning computer 1 is installed on a free access floor, and fans 2 </ b> A to 2 </ b> D capable of generating an arbitrary air volume by a change in rotation speed, and fans for driving and controlling those fans A drive circuit 3, air flow detection units 4 </ b> A to 4 </ b> D for detecting the flow of cold air taken into the drive circuit 3, and an air flow detection control unit 5 for controlling the fan drive circuit 3 so that an optimal air flow is sent to the inside of the computer 1. And an alarm display section 6 for displaying an abnormal air flow control when the air flow is abnormal.

In the above configuration, the fans 2A to 2D and the fan drive circuit 3 are built in a part of the floor, and the air volume detection units 4A to 4D and the air volume detection control unit 5
Inside, the alarm display unit 6 is mounted in a place that can be seen from the outside of the computer 1. The mounting locations of the air volume detection units 4A to 4D may not correspond to the fans 2A to 2D, respectively, and the number thereof may be different from the number of fans.

In this embodiment, the number of fans is four. The fan constituting the present invention is of a built-in floor type housed in the floor of the free access floor and has a limited space, so that it is common to use a plurality of small fans. Further, by blowing air with a plurality of fans, there is also an effect that the air can be blown all over the inside of the computer as compared with a single fan. Note that the number of fans is selected according to the required air volume, volume, area, and the like, and is not limited to four. Similarly, the number of airflow detecting units is not limited to four, but can be increased or decreased.

Next, a detailed configuration of the air volume detection control unit 5 of FIG. 1 will be described with reference to FIG. FIG. 2 is a block diagram showing the configuration of the first embodiment of the present invention, in which the air volume detection units 4A to 4D, the air volume detection control unit 5, and the fan 2A
2D, the fan drive circuit 3 and the alarm display unit 6 are shown.

The air volume detection control unit 5 includes an average air volume calculation unit 51
, A comparison unit 52, an air volume setting unit 53, a fan drive signal generation unit 54, and a monitoring timer 55.

The average air volume calculation unit 51 includes air volume detection units 4A to 4A.
The airflow value from 4D is calculated, and the average airflow value is output to the comparison unit 52.

The comparison unit 52 compares the average air volume value from the average air volume calculation unit 51 with a preset air volume value (optimal air volume value for a computer) preset in the air volume setting unit 53,
As a result of the comparison, a difference ratio (a ratio obtained by dividing a difference between the average airflow value of the detected airflow and the set airflow value by the set airflow value) is output to the fan drive signal generator 54. In addition, the monitoring timer 1 set signal T1, the monitoring timer 2 set signal T2, and the monitoring timer reset signal TR are output to the monitoring timer 55, and the alarm reset signal AR is output to the alarm display unit 6, based on the difference ratio.

The fan drive signal generator 54 includes a comparator 52
The difference ratio of the detected air volume is input from the
Drive signal FA for uniformly controlling the rotation speed of ~ 2D
Is output to the fan drive circuit 3. Fan drive signal FA
Is generated, for example, is stored in advance in the fan drive signal generation unit 54 in association with the voltage value and the rotation speed step signal for each positive and negative difference ratio of 1%, and the difference ratio is input from the comparison unit 52. This can be achieved by reading out a voltage value, a rotation speed step signal, or the like corresponding to the operation.

The monitoring timer 55 starts the timer operation in response to the monitoring timer 1 set signal T1 or the monitoring timer 2 set signal T2 from the comparing section 52. When the monitoring timer reset signal TR from the comparing unit 52 is not input even after a certain time (for example, one minute) has elapsed, if the monitoring timer 1 set signal T1 has been input, the alarm 1 set signal A1 is output. When the monitoring timer 2 set signal T2 has been input, the alarm 2 set signal A2 is output to the alarm display unit 6, respectively.

The alarm display section 6 displays the alarm 1 by the alarm 1 set signal A1 and the alarm 2 set signal A
2, the alarm 2 is displayed, and the alarm display is reset by the alarm reset signal AR.

Next, the operation of the first embodiment of the present invention will be described in detail with reference to FIGS. FIG.
4 is a flowchart illustrating an operation of the first exemplary embodiment of the present invention.

Referring to FIG. 1, when the air-conditioned cold air from the underfloor air conditioner is blown into the inside of the computer 1 by the fans 2A to 2D installed in the floor, an optimum air volume for the computer 1 is previously detected and controlled. The fan 2A is set so as to eliminate the difference between the set air volume and the average value of the air volume detected by the air volume detection units 4A to 4D.
To 2D. At this time, if the difference ratio is 10% or more, assuming that the set value of the monitoring timer 55 is one minute,
When the monitoring timer 55 has elapsed for one minute, the difference in air volume is 10
%, And the alarm display 6 displays the alarm 1
Is displayed. When the difference ratio is 5% or more and less than 10%, when the monitoring timer 55 has elapsed for one minute, it is determined that the difference in air volume is 5% or more, and the alarm 2 is displayed on the alarm display unit 6. .

Referring to FIG. 2, the air volume detection units 4A to 4D
Is calculated (added by four airflows and divided by 4), and the average airflow is output to the comparison unit 52. The comparison unit 52 compares the average airflow value from the average airflow calculation unit 51 with an airflow value optimal for the computer preset in the airflow setting unit 53, and obtains a difference ratio (average airflow of the detected airflow) as a comparison result. The ratio of the difference between the value and the set airflow value divided by the set airflow value) is calculated by the fan drive signal generator 5.
4 is output. The fan drive signal generator 54 outputs the fan drive signal FA to the fan drive circuit 3, and outputs the fan 2A to
The rotation speed of the 2D is controlled so as to eliminate the difference between the current operation state and the optimum airflow value. At this time, when the difference ratio is 10% or more, the comparing unit 52 outputs the monitoring timer 1 set signal T1 to the monitoring timer 55 to operate the timer. When the difference ratio is 5% or more and less than 10%, the comparing unit 52 first issues the monitoring timer reset signal TR to reset the monitoring timer 55, and then sends the monitoring timer 2 set signal T2 to the monitoring timer 55. Output and operate the timer. Then, when the difference ratio becomes less than 5%, the comparing section 52 issues a monitoring timer reset signal TR to reset the monitoring timer 55 and outputs an alarm reset signal AR to the alarm display section 6.

After the timer is started by the monitor timer 1 set signal T 1, if the timer is not reset by the monitor timer reset signal TR within one minute, the monitor 1 Outputs set signal. Similarly, the monitoring timer 2 set signal T
If the timer is not reset by the monitoring timer reset signal TR even after a lapse of one minute after the timer is started by 2, an alarm 2 set signal is output to the alarm display unit 6.

When the alarm display unit 6 receives the alarm 1 set signal, the alarm 1 indicates that the difference in the air volume is 10% or more. When the alarm display unit 6 receives the alarm 2 set signal, the difference in the air volume exceeds 5%. Alarm 2 indicating that
Are displayed. Further, the alarm display is reset by the alarm reset signal AR from the comparing unit 52. As a result, if neither the alarm 1 nor the alarm 2 is displayed, it can be understood that the normal operation is being performed.

Referring to FIG. 3, first, when the power is turned on, the fan drive circuit 3 starts the operation of the fans 2A to 2D. At this time, the fan drive circuit 3 is set to be a drive signal corresponding to the set airflow in the initial state.

Next, the comparing section 52 operates for a waiting time of one minute by the monitoring timer 55 (step S in FIG. 3).
1) The monitoring timer is reset and the monitoring timer 55 is initialized (step S2).

Next, an average airflow value is obtained from the airflows of the plurality of airflow detection units 4A to 4D (step S3), and the airflow comparison operation of the comparison unit 52 shows how much the average airflow value differs from the set airflow value. Are compared (step S4).

As a result of the comparison in step S4, the difference ratio is 1
If it is 0% or more, the operation of controlling the fan rotation speed to eliminate the difference and starting the monitoring timer (one monitoring timer set) is performed (step S5).

Here, the monitoring timer comparison (step S6)
Therefore, if less than one minute, the air volume comparison (step S4) is repeated.

Even if the monitoring timer comparison (step S6) has elapsed for one minute, if the difference ratio from the set airflow value is 10% or more, the operation for displaying alarm 1 (step S7) is performed. Thereafter, the monitoring timer reset operation (step S1)
5) is performed, and the process returns to the average air volume calculation operation (step S3) to continue the air volume control.

If the difference ratio is less than 10% in the air volume comparison (step S4), a monitoring timer reset operation (step S8) is performed.

Next, similarly, the air volume detection operation (step S
In step 9), the average airflow value is obtained again, and an airflow comparison operation (step S10) is performed.

In the air volume comparison (step S10), when the difference ratio becomes 5% or more, the operation of driving each fan so as to eliminate the difference and starting the monitoring timer (two sets of monitoring timers) is performed. (Step S11).

Here, the monitoring timer comparison (step S1)
According to 2), if less than one minute, the air volume is compared (step S10).
repeat.

Even if the monitoring timer comparison (Step S12) has elapsed for one minute, if the difference ratio from the set airflow value is 5% or more, the operation for displaying the alarm 2 (Step S13) is performed. Thereafter, the monitoring timer reset operation (step S1)
5), and return to the air volume detection operation (step S3);
Continue the air volume control.

If the difference ratio is less than 5% in the air volume comparison (step S10), the alarm reset operation (step S14) and the monitoring timer reset operation (step S15) are performed, and then the average air volume value calculation is performed. Returning to the operation (step S3), the air volume control is continued.

In the above description, step S7
It is explained that after the alarm 1 is displayed, the monitoring timer reset operation (step S15) is performed, the operation returns to the average airflow value calculation operation (step S3), and the airflow control is continued.
When the alarm 1 is displayed in step S7, the subsequent operation may be stopped.

Next, a second embodiment of the present invention will be described with reference to the drawings.

In the first embodiment of the present invention described above, the operation of each fan is made uniform by the difference between the average value of the air volume from each air volume detection unit and one value set in the air volume setting unit. However, in the present embodiment, each of the airflow values is obtained by calculating a difference between an individual airflow value from each airflow detection unit and a value set for each airflow detection unit in the airflow setting unit. It is characterized in that each fan corresponding to the detection unit on a one-to-one basis is individually controlled.
This allows more flexible cooling of the heat generated inside the computer.

Referring to FIG. 4, differences in operation will be described. FIG. 4 is a diagram showing a usage example of the second embodiment of the present invention.

It is tentatively set to four places where the amount of heat generated inside the computer is high, and in each of the four places, a combination in which one fan which can be individually controlled is associated with one airflow detecting unit is arranged. . Further, in the present embodiment, four air volume detection units and four fans are used.
The number is selected according to the volume, area, and the like.

When air-conditioning cool air from the underfloor air conditioner is blown into the computer 7 by the fans 8A to 8D installed in the floor, the optimum air volume is set at every four places where cooling is required inside the computer. To the air volume detection control unit 1 in advance.
The respective fans 8A to 8D are individually driven so as to eliminate the differences between the air volumes and the air volumes detected by the air volume detection units 10A to 10D.
At that time, if each difference ratio is 10% or more,
Assuming that the set value of the monitoring timer 115 is one minute, when the monitoring timer 115 elapses one minute, it is determined that the difference in the air volume at that location is 10% or more, and the alarm 1 is displayed on the alarm display unit 12 for each location. Is displayed. When the difference ratio is 5% or more and less than 10%, the monitoring timer 1
After 15 minutes, the difference in air volume at that location is 5%
It is determined that the above is the case, and the alarm display section 12 displays the alarm 2
Is displayed for each location.

Referring to FIG. 5, differences in operation will be described. FIG. 5 is a block diagram showing a configuration of the second exemplary embodiment of the present invention.

The comparison unit 112, the air volume setting unit 113, the fan drive signal generation unit 114, the monitoring timer 115, the alarm display unit 12, and the fan drive circuit 9 each have four units corresponding to each combination of the fan and the air volume detection unit. It has an independently operating circuit inside.

At four locations of the air volume detectors 10A to 10D, the respective air volumes detected therefrom and the air volume setting unit 113
The comparison unit 112 compares and calculates a difference between each of the airflows set in advance corresponding to each of the airflow detection units, and outputs the value of each difference to the fan drive signal generation unit 114.

The fan drive signal generation section 114 outputs a fan drive signal FAA to each fan drive circuit 9 for each fan, and individually rotates the fans 8A to 8D so as to eliminate the respective differences from the current operation state. Perform numerical control. At that time, when the difference ratio is 10% or more, the comparing unit 112 sets each monitoring timer 1 set signal T1A.
Is output to the monitoring timer 115 to operate the timer. Further, the comparison unit 112 determines that each difference ratio is 5%.
If the above is less than 10%, each monitoring timer reset signal TRA is first issued to reset the monitoring timer 55, and then each monitoring timer 2 set signal T2A is output to the monitoring timer 55 to operate the timer. Then, when the respective difference ratios become less than 5%, the comparing section 112 issues each monitoring timer reset signal TRA to reset the monitoring timer 55, and outputs each alarm reset signal ARA to the alarm display section 12, respectively. I do.

If the timer is not reset by the monitoring timer reset signal TRA even if one minute or more has elapsed since the timer was started by the monitoring timer 1 set signal T1A, the monitoring timer 115 An alarm 1 set signal A1A is output. Also,
After the timer is started by each monitoring timer 2 set signal T2A, if the timer is not reset by each monitoring timer reset signal TRA even if one minute or more has passed, the alarm display unit 12 displays each alarm 2 set signal A2A. Output.

Upon receiving each alarm 1 set signal A1A, the alarm display section 12 displays a difference in air volume at that location by one.
Alarm 1 indicating 0% or more, and alarm 2
When the set signal A2A is received, an alarm 2 indicating that the difference in the air volume at the location is 5% or more is displayed according to each location. The display of each alarm is reset by each alarm reset signal ARA from the comparison unit 112. This will cause alarm 1,
If neither is displayed, it means that the place is operating normally.

The difference between the control methods will be described with reference to FIG.
FIG. 6 is a flowchart showing the operation of the second embodiment of the present invention.

First, when the power is turned on, the fan drive circuit 9 starts the operation of the fans 8A to 8D. At this time, the fan drive circuit 9 is set so that a drive signal corresponding to each set airflow is provided for each fan in an initial state.

Next, the comparator 112 performs a one-minute waiting time operation by the monitoring timer 115 (step S21 in FIG. 6), and then performs a monitoring timer reset operation to perform the monitoring timer 1 operation.
15 is initialized (step S22).

From here on, the control operation of each fan is performed individually and independently, however, the overall control is as follows.

The respective air volume detection operations (step S23) detect the respective air volume values, and perform the respective air volume comparison operations (step S2).
According to 4), how much each air volume value differs from each set air volume value is compared.

As a result of the comparison in step S24, when the difference ratio is 10% or more, the operation of individually controlling the rotation speed of each fan so as to eliminate the difference and starting the monitoring timer (one set of monitoring timer) (Step S2)
5).

Here, each monitoring timer is compared (step S2).
According to 6), if less than one minute, each air volume comparison operation (step S
Repeat 24).

If the difference ratio from each set airflow value is 10% or more even after one minute has elapsed for each monitoring timer comparison (step S26), the operation is to display alarm 1 for each (step S27). Thereafter, a monitoring timer reset operation (Step S35) is performed, and the flow returns to each air flow detection operation (Step S23) to continue the air flow control.

In each air volume comparison (step S24),
When the difference ratio is less than 10%, each monitoring timer reset operation (Step S28) is performed.

Next, similarly, each air volume detection operation (step S
29) is performed, and each air volume comparison operation (step S30) is performed.

In each air volume comparison (step S30),
If the difference ratio is equal to or more than 5%, each fan is driven so as to eliminate the difference, and an operation of starting each monitoring timer (two sets of monitoring timers) is performed (step S3).
1).

Here, each monitoring timer is compared (step S3).
According to 2), if it is less than one minute, each air volume is compared (step S3
Repeat 0).

If the difference ratio with each set airflow value is 5% or more even after one minute has elapsed for each monitoring timer comparison (step S32), the operation is to display the alarm 2 for each (step S33). Thereafter, each monitoring timer reset operation (Step S35) is performed, and the process returns to each air volume detection operation (Step S23), and the air volume control is continued for each.

In each air volume comparison (step S30),
When the difference ratio is less than 5%, after each alarm reset operation (step S34) and each monitoring timer reset operation (step S35) are performed, the process returns to each air volume detection operation (step S23), and is performed. Continue the air volume control.

In the above description, step S2
It is described that after the alarm 1 is displayed in step 7, each monitoring timer reset operation (step S35) is performed, the flow returns to each air flow detection operation (step S23), and the air flow control is continued, but the alarm 1 is reset in step S27. At the time of the display, the subsequent operation may be stopped.

In the first and second embodiments of the present invention described above, the alarm 1 is displayed when the difference from the set air volume is 10% or more, and the alarm 2 is displayed when the difference is 5% or more and less than 10%. The two-stage alarm display has been described. However, the present invention is not limited to this, and another difference ratio may be applied, or a multi-stage alarm display of three or more stages may be used.

Next, a third embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 7 is a block diagram showing the configuration of the third embodiment of the present invention, which comprises a computer 13 and a recording medium 14. The configuration of the computer 13 is as follows.
FIG. 2 shows the first embodiment of the present invention, and FIG.
This is basically the same as the air volume detection control unit described in the embodiment. The recording medium 14 records a cooling control program. The recording medium 14 may be a magnetic disk, an optical recording disk, a semiconductor memory, or another recording medium. The cooling control program is read from the recording medium 14 into the computer 13 and controls the same operation as in the first and second embodiments of the present invention.

[0078]

According to the present invention, the optimum air volume of the air-conditioning cool air to be blown into the underfloor air-conditioning system computer is set in advance, and the amount of air actually blown is detected so that each fan is adjusted to match the set air volume. Because rotation speed control is performed, even if there is a change in the direction of airflow or flow rate of underfloor air-conditioning cool air, it is possible to always send the optimal amount of cool air to the inside of the computer, and the computer element due to temperature changes inside the computer. There is an effect that a failure or the like can be prevented.

Further, even if the air volume detected inside the computer is out of the set air volume, the operation is controlled so as to approach the set air volume again without stopping the operation, and the control state is displayed as a multi-step alarm display. It also has the effect that it can be easily checked from outside.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of use of a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a first exemplary embodiment of the present invention.

FIG. 3 is a flowchart showing an operation of the first exemplary embodiment of the present invention.

FIG. 4 is a diagram showing a usage example of the second embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a second exemplary embodiment of the present invention.

FIG. 6 is a flowchart showing an operation of the second exemplary embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a third exemplary embodiment of the present invention.

[Explanation of symbols]

 1,7 computer 2A-2D, 8A-8D fan 3,9 fan drive circuit 4A-4D, 10A-10D air volume detection unit 5,11 air volume detection control unit 51 average air volume calculation unit 52,112 comparison unit 53,113 air volume setting Units 54, 114 Fan drive signal generation units 55, 115 Monitoring timer 6, 12 Alarm display unit 13 Computer 14 Recording medium

Claims (12)

[Claims] An underfloor air-conditioning computer cooling system for cooling an inside of a computer installed on a free access floor, wherein an average value of airflow detected by a plurality of airflow detection units provided inside the computer is calculated. Means for calculating as an average airflow value, and means for comparing the average airflow value with a preset airflow value, and uniformly controlling the rotation speeds of a plurality of fans built in the floor so as to eliminate the difference. And means for displaying the state of the difference in multiple stages according to the amount of difference. 2. An underfloor air-conditioning system for cooling the inside of a computer installed on a free access floor, wherein the computer is built in the floor of the free access floor immediately below the computer, and the underfloor air-conditioning cool air is cooled. A plurality of fans for blowing air into the computer, a plurality of air volume detection units provided at different locations inside the computer and detecting air volume values at the respective locations; and An average air volume calculation unit that obtains air volume values and calculates an average air volume value; an air volume setting unit that presets and holds an optimal air volume value inside the computer as a set air volume value; A comparing unit that compares the average airflow value obtained from the above with the set airflow value obtained from the airflow setting unit and detects a difference between the airflow value and the set airflow value; A fan drive signal generation unit that receives a difference information from the comparison unit and generates a fan drive signal that controls the rotation speed of the fan so as to eliminate the difference, and a fan drive signal received from the fan drive signal generation unit. And a fan drive circuit for uniformly driving the plurality of fans. 3. The comparison unit according to claim 2, wherein the comparing unit further determines which difference level the difference is divided into in multiple levels in advance, and sends the determined difference level signal to a monitoring timer. When the difference level changes within a time period, the difference level signal sent to the monitoring timer is updated, and the difference level signal is received from the comparison unit even if the predetermined time has passed after receiving the difference level signal from the comparison unit. If the signal has not been updated, a monitoring timer that sends an alarm level signal corresponding to the differential level signal received at that time to an alarm display unit, and a display unit for each of the alarm level signals. An under-floor air-conditioning computer, further comprising: an alarm display unit for displaying an alarm level signal on a corresponding display unit when the alarm level signal is received. Cooling system. 4. An underfloor air-conditioning computer cooling system for cooling the inside of a computer installed on a free access floor, wherein the airflow is detected for each of a plurality of fans installed in the floor. The same number of the detection units as the number of the fans are provided in the computer, and the individual air volume values detected by the air volume detection units are compared with the preset air volume values set in advance for each of the air volume detection units. Means for individually controlling the rotation speed of each of the fans so as to eliminate them, and means for displaying the state of the respective differences in multiple stages for each of the air volume detection units according to the amount of difference. Underfloor air conditioning computer cooling system. 5. An underfloor air-conditioning computer cooling system for cooling the inside of a computer installed on a free access floor, wherein the underfloor air-conditioning cool air is built in the inside of the free access floor immediately below the computer. A plurality of fans for blowing air into the computer; a plurality of air volume detection units provided for each of the fans in the same number as the number of the fans in the computer, for detecting air volume values of the corresponding fans; An air volume setting unit that presets and holds an optimal air volume value for each air volume detection unit as a set air volume value in correspondence with each of the air volume detection units, and an air volume value acquired from each of the air volume detection units, and A comparison unit configured to compare a set airflow value for each of the airflow detection units obtained from the airflow setting unit and individually detect respective differences, A fan drive signal generation unit that receives respective difference information and generates a fan drive signal that individually controls the rotation speed of each fan corresponding to each of the air volume detection units so as to eliminate these differences; And a fan drive circuit for individually driving a corresponding fan according to each fan drive signal received from the unit. 6. The apparatus according to claim 5, wherein the comparing unit further determines which difference level the difference is divided into in multiple levels in advance, and outputs the determined difference level signal to each of the air volume detecting units. A difference level signal sent to the monitoring timer is sent to the monitoring timer, and when the difference level changes within a predetermined time, the difference level signal sent to the monitoring timer is updated for each of the air volume detection units, and each difference level signal from the comparison unit is received. If the difference level signal has not been updated from the comparison section even after the predetermined time has passed, the alarm level signal corresponding to the difference level signal for each of the air volume detection sections received at that time is alarmed. A monitoring timer to be sent to a display unit; and a display unit for each of the air volume detection units and for each of the alarm level signals, wherein an alarm level for each of the air volume detection units from the monitoring timer is provided. Cooling system of underfloor air conditioning system a computer, characterized by further having an alarm display unit for displaying on the display unit and the corresponding receiving signal. 7. The comparison unit according to claim 3, wherein when the difference level is the minimum difference level, the comparison unit does not send the difference level to the monitoring timer and does not display an alarm.
Or a cooling method for an underfloor air-conditioning computer according to 6. 8. A method for cooling an underfloor air-conditioning computer for cooling the inside of a computer installed on a free access floor, wherein the plurality of airflow detecting units provided inside the computer detect and detect the airflow. The calculated average value of the respective airflows is calculated as an average airflow value, the average airflow value is compared with a preset airflow value, and the rotational speeds of the plurality of fans built into the floor are eliminated so as to eliminate the difference. And uniformly displaying the difference, and displaying the state of the difference in multiple stages according to the amount of difference. 9. A method of cooling an underfloor air-conditioning computer that cools the inside of a computer installed on a free access floor, wherein an optimum airflow value inside the computer is previously set and held as a set airflow value. A first step, a second step of detecting a respective air volume by a plurality of air volume detection units provided in the computer, and an average air volume value detected in the second step. A third step of calculating as
A fourth step of comparing the average airflow value with the preset airflow value set in the first step to calculate a difference between the average airflow value and the set airflow value set in advance in the first step; and uniformly controlling the rotation speeds of the plurality of fans to eliminate the difference. A fifth step of controlling, a sixth step of determining which of the difference levels the difference is divided into in advance in multiple stages, and a predetermined time after holding the difference level determined in the sixth step. During the second
A seventh step of repeating the operation of the sixth step; and, if the difference level has changed within the fixed time, updating and holding the difference level. An underfloor air-conditioning type computer comprising: an eighth step of repeating the operation of step 6, and a ninth step of, after the elapse of the predetermined time, displaying a display corresponding to the difference level held at that time. Cooling method. 10. A method of cooling an underfloor air-conditioning computer that cools the inside of a computer installed on a free access floor, comprising: , And each detected air volume value is compared with a preset air volume value set in advance for each of the air volume detection units, and the rotation speed of each of the fans is individually adjusted so as to eliminate the respective differences. And displaying the states of the respective differences in multiple stages for each of the air volume detection units in accordance with the amount of difference. 11. A method of cooling an underfloor air-conditioning computer for cooling the inside of a computer installed on a free access floor, wherein an optimum airflow value is set for each of a plurality of airflow detection units provided inside the computer. A first step of presetting and holding as an air volume value, a second step of detecting each air volume with the plurality of air volume detection units, and a respective air volume value detected in the second step and A third step of comparing the preset air volume values for each of the air volume detection units preset in the first step, and individually calculating the differences between them; and rotating the fans so as to eliminate the respective differences. A fourth step of individually controlling the speed; and a fifth step of determining, for each of the air volume detection units, which difference level the difference is divided into in multiple levels in advance. A sixth step of repeating the operations of the second to fifth steps for a certain period of time after holding the difference level for each of the air volume detection units determined in the fifth step; A seventh step of updating and holding the difference level for each of the air volume detection units when the difference level has changed, and repeating the operations of the second to fifth steps again for the fixed time; And after the elapse of the predetermined time, performing an indication corresponding to the difference level held at that time for each of the air volume detection units. 12. A recording medium recording a cooling control program for causing a computer to execute the method according to claim 9 or 11.