JP6344018B2 - Temperature and humidity control system - Google Patents

Description

  The present invention relates to a temperature and humidity control system that controls the temperature and humidity of a space to be controlled such as a computer room.

  There is Patent Document 1 as a document disclosing such a technique. In the system disclosed in this document, control is performed to match the indoor temperature with a set value by using an outside air cooling means in combination with a cooling source device such as a refrigerator.

JP 2010-78245 A

  In order to reduce energy consumption in indoor temperature and humidity control, as disclosed in Patent Document 1, temperature and humidity control in which outside air cooling is introduced in addition to a cooling heat source device such as a refrigerator is desired. However, in order to perform temperature and humidity control with the introduction of outside air cooling, it is necessary to control the damper for adjusting the exhaust amount and the outside air introduction amount in addition to operating the exhaust and outside air introduction fans. However, in the technique disclosed in Patent Document 1, since the control for matching the temperature with the target value is performed, the amount of operation of the dampers is frequently updated, and the consumption for temperature and humidity control is increased. There was a problem of increasing energy. However, in a computer room or the like, it is not necessary to strictly match the temperature and humidity with the target values, and if the temperature and humidity are within a certain upper limit value and lower limit value, the purpose of air conditioning is sufficiently achieved. Therefore, excessively operating the dampers for temperature and humidity control in order to make the temperature and humidity exactly match the target values consumes energy wastefully. As one countermeasure against this problem, model predictive control has been applied so far. This control method is control that minimizes an error between the control amount and the target value and a change amount of the operation amount while keeping the operation amount and the control amount within the range of the upper and lower limit values. However, this model predictive control has a problem of enormous costs because it requires engineering man-hours for control system modeling and controller design. Furthermore, there is a problem that only a limited engineer who understands the model predictive control technology can design and operate the control system.

  The present invention has been made in view of the circumstances as described above, and an object thereof is to provide a temperature / humidity control system that uses both a heat source device such as a refrigerator and an outside air cooling and realizes energy saving. .

  The present invention relates to a temperature sensor that measures the temperature in the control target space, a humidity sensor that measures the humidity in the control target space, and an exhaust that adjusts the amount of air discharged outside the control target space. Damper, a return air damper that adjusts the return air volume that is returned to the control target space out of the air that is discharged from the control target space, an outside air introduction damper that adjusts the air volume introduced from the outside, and the return air A humidifier for adjusting the humidity of the air that has passed through the damper and the outside air introduction damper, air supply means for returning the air whose humidity has been adjusted by the humidifier to the space to be controlled, and water supplied to the humidifier The humidification valve for adjusting the amount of the exhaust gas and the temperature measured by the temperature sensor as a control amount, and based on the deviation between the control amount and the target value, the exhaust damper, the return air damper And a temperature control PID controller for calculating an operation amount to be applied to the outside air introduction damper, and a humidity measured by the humidity sensor as a control amount, and based on a deviation between the control amount and a target value, the humidification A humidity control PID controller that calculates an operation amount to be applied to the control valve, and a temperature control PID controller and a humidity control PID controller under the condition that the control amount is within the upper and lower limits of the set value. A temperature / humidity control system comprising a dead zone control means for stopping any one or more operation amount outputs among the three operation amounts calculated from the terms I, D and D is provided.

  According to this invention, since the temperature and humidity in the control target space are controlled by using both the cooling source device such as a refrigerator and the outside air cooling, the energy consumption can be reduced and the temperature and humidity can be controlled efficiently. it can. The dead zone control means is calculated from the P term, the I term, and the D term of the temperature control PID regulator and the humidity control PID regulator under the condition that the control amount is within the upper and lower limit values of the set value. Since any one or more of the three manipulated variables are stopped, the exhaust damper, the outside air introduction damper, the return air damper, or the humidifying valve is excessively operated in response to a slight deviation. Can be prevented and energy consumption can be reduced.

It is a figure which shows the structure of the temperature / humidity control system which is 1st Embodiment of this invention. It is a block diagram which shows the structural example of the speed type PID regulator which can be used for the embodiment. It is a block diagram which shows the structural example of the position type PID regulator which can be used for the embodiment. It is a block diagram which shows the structure of the control system in the same embodiment. It is a figure which shows the process of the dead zone control part of the embodiment.

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

<First Embodiment>
FIG. 1 is a diagram showing a configuration of a temperature and humidity control system according to a first embodiment of the present invention. This temperature / humidity control system is a system in which the space in the server room 10 is a control target space, and the temperature and humidity in the control target space are controlled within a set range. This temperature / humidity control system is provided with air channels 20, 30, 40 and 50 and water channels 60 and 80.

  The exhaust fan 22 is a device that extracts air from the server room 10 via the flow path 20 and exhausts the air to the outdoors. An exhaust damper 21 for adjusting the amount of exhaust discharged to the outside by the exhaust fan 22 is provided upstream of the exhaust fan 22 in the flow path 20.

  The flow path 40 branches from the middle of the flow path 20 and reaches an air handling unit (air supply means) 70. The air handling unit 70 is a device that adjusts the air introduced into the server room 10. The flow path 40 is a return air flow path that returns to the server room 10 through the air handling unit 70 out of the air discharged from the server room 10 to the exhaust flow path 20. A return air damper 41 for adjusting the return air volume is provided in the middle of the flow path 40.

  The flow path 30 is a flow path for supplying outside air introduced from the outside by the outside air introduction fan 32 to the air handling unit 70. An outside air introduction damper 31 for adjusting the amount of outside air introduced from the outside via an outside air introduction fan 32 is provided in the middle of the flow path 30.

  The air handling unit 70 has a humidifier 71. The humidifier 71 humidifies the air introduced into the air handling unit 70 through the flow paths 30 and 40, thereby generating humidity-adjusted air. The humidity-adjusted air is supplied through the flow path 50 and is supplied into the server room 10 from a blowout port provided in the server room 10. The humidifying valve 81 is a device for adjusting the flow rate of water introduced into the humidifier 71 in the air handling unit 70 via the flow path 80.

  The flow path 60 is a flow path that passes through the auxiliary heat source 62 and the air handling unit 70. The auxiliary heat source 62 is a device that cools water supplied through the flow path 60. The air handling unit 70 cools the air supplied to the server room 10 with the cooling water supplied via the flow path 60. The channel 60 is provided with a valve 61 for adjusting the flow rate of the cooling water supplied to the air handling unit 70.

  In the server room 10, a temperature sensor 11 and a humidity sensor 12 that measure the temperature and humidity of air introduced from the air handling unit 70 through the air outlet are installed.

Temperature control PID controller 101, the temperature _{T PV} measured by the temperature sensor 11 as a control quantity, based on the deviation _T SV _{-T PV} between the control amount and the target value _{T SV,} exhaust damper 21, instead a device for calculating a manipulated variable MV _T to be applied to the gas damper 41 and the outside air inlet damper 31. More specifically, in the present embodiment, the manipulated variable MV _T indicates the opening degree of the exhaust damper 21 and the outside air introduction damper 31, and 100% -MV _T indicates the opening degree of the return air damper 41.

Further, the humidity control PID controller 102, the humidity _{X PV} measured by the humidity sensor 12 as a control quantity, based on the deviation _X SV _{-X PV} between the control amount and the target value _{X SV,} humidifying valve 81 This is a device for calculating an operation amount MV _X for instructing the opening degree.

The dead zone control unit 110 is calculated from the P term, the I term, and the D term of the temperature control PID adjuster 101 and the humidity control PID adjuster 102 under the condition that the control amount is within the upper and lower limit values of the set value. This is a device that stops the output of any one or more of the operation amounts.
The above is the outline of the temperature and humidity control system according to the present embodiment.

FIG. 2 is a block diagram showing a speed type PID controller 101A (102A) as a first configuration example of the temperature control PID controller 101 and the humidity control PID controller 102. The velocity type PID controller 101A (102A) in accordance with the following formula (1), an exhaust damper 21, calculates a manipulated variable MV _T to be applied to the return air damper 41 and the outside air inlet damper 31 or humidifying valve, An operation amount MV _X applied to 81 is calculated.

In the above formula (1), k is an index _indicating the current step, e _k is a deviation between the control amount PV _{k at the} current step and the target value SV, and e _k−1 is the control amount PV _{k−1 at the} previous step. Deviation from the target value SV, ek _-2 is the deviation between the control amount PV _k-2 and the target value SV two steps before, ΔMV _k is the operation difference output at the current step k, and ΔMVD _k-1 is ₁ of the current step. Operation differential output in the previous step k-1, PB is proportional band [%], Ti is integration time [s], Td is differential time [s], DT is a sampling period [s], da Is the derivative.

FIG. 3 is a block diagram showing a position type PID adjuster 101B (102B) which is a second configuration example of the temperature control PID adjuster 101 and the humidity control PID adjuster 102. The position type PID controller 101B (102B) in accordance with the following formula (2), an exhaust damper 21, calculates a manipulated variable MV _T applied to the return air damper 41 and the outside air inlet damper 31 or humidifying valve 81, An operation amount MV _X to be added to is calculated.

  The temperature control PID adjuster 101 and the humidity control PID adjuster 102 according to the present embodiment, as shown in FIGS. 2 and 3, in addition to the configuration of the normal PID adjuster, A dead band forming unit 111 that stops the output of the P term (proportional term) and a dead band forming unit 112 that stops the output of the D term (differential term) under a predetermined condition.

Here, the dead zone forming unit 111 multiplies the deviation SV-PV _k between the control amount PV _k and the target value SV by the coefficient DB_P supplied from the dead zone control unit 110 as an input value of the P term. . Further, the dead zone forming unit 112 multiplies the deviation SV-PV _k between the control amount PV _k and the target value SV by the coefficient DB_D supplied from the dead zone control unit 110 as an input value of the D term. The coefficients DB_P and DB_D are 0 in the dead zone and 1 in the region outside the dead zone. The dead zone control unit 110 determines which region is the dead zone.

  FIG. 4 is a block diagram showing the configuration of the control system of the temperature and humidity control system according to this embodiment. In FIG. 4, the plant is the whole of the server room 10 in FIG. 1 and various facilities provided for controlling the temperature and humidity of the server room 10.

In FIG. 4, the dead zone control unit 110 has a function of accepting settings of an upper limit value T _UL and a lower limit value T _LL for temperature, and an upper limit value X _UL and a lower limit value X _LL for humidity.

Then, the dead zone controller 110 compares the upper and lower temperature limits T _UL and T _LL with the control amount PV _K , and sets the coefficients DB_P _T and DB_D _T to be supplied to the temperature control PID controller 101 based on the comparison result as 1. Decide whether you want to do or zero. The lower limit _X UL on the _humidity, or by comparing the _{X LL} and the controlled variable PV _K, and the humidity control PID controller 102 supplies coefficient DB_P _X and DB_D _X 0 or a 1 on the basis of the comparison result To decide.

  FIG. 5 is a diagram showing processing executed by the dead zone control unit 110 in the present embodiment. The dead zone control unit 110 repeatedly executes the process shown in FIG.

The processing contents to be periodically executed will be described. First, the dead zone control unit 110 calculates temperature and humidity control amounts T _PV and X _PV , operation amounts MV _T and MV _X, and information on preset upper and lower limit values. , Whether the conditions 1 to 4 are true or false is determined. here,
Condition 1: T _LL ≦ T _PV ≦ T _UL
Condition 2: MV _T = 0 or MV _T = 100
Condition 3: X _LL ≦ X _PV ≦ X _UL
Condition 4: MV _X = 0 or MV _X = 100
It is.

Then, the dead zone controller 110 determines the dead zone coefficient values DB_P _T , DB_D _T , DB_P _X , DB_D _X , and the value of the start command δ _h for the auxiliary heat source 62 that matches the true / false combination of the conditions. . Specifically, it is as follows.
(1) When the condition 1 is true and the condition 3 is true, the output of the P term and the D term is stopped in the temperature control PID adjuster 101 and the humidity control PID adjuster 102.
(2) If condition 1 is true, condition 3 is false, and condition 4 is false, if condition 1 is false, condition 2 is false, and condition 3 is true, the PID controller exceeds the upper and lower limit values. P term and D term are output.
(3) Condition 1 is true, Condition 3 is false, Condition 4 is true, Condition 1 is false, Condition 2 is true, Condition 3 is true, Condition 1 is false, Condition 3 is false, Condition When the condition 4 is false, the condition 1 is false, the condition 2 is false, and the condition 3 is false, the temperature control PID controller 101 and the humidity control PID controller 102 output the P and D terms.
(4) When condition 1 is false, condition 2 is true, condition 3 is false, and condition 4 is true, the PID and D terms are output in the temperature control PID controller 101 and the humidity control PID controller 102. And the auxiliary heat source 62 is started.

  Further, the threshold value α is set to the upper and lower limits of the temperature and humidity in the conditions 1 and 3. Specifically, when the control amount exceeds the upper limit value, the upper limit value is decreased by the threshold value α, and when the control amount falls below the upper limit value, the upper limit value is increased by the threshold value α. The same applies to the lower limit value. As described above, by providing the comparison operation between the control amount and the upper and lower limit values with hysteresis characteristics, it is possible to avoid the dead band coefficient value from fluctuating frequently when the control amount is in the vicinity of the upper and lower limit values.

As described above, according to the present embodiment, not only the humidifier 71 is used but also the temperature and humidity control in the server room 10 is performed by using the outside air cooling together. Energy can be reduced. In the present embodiment, the dead zone is effective for the P term and D term of the temperature control PID adjuster 101 in the region that is within the upper and lower limits of the temperature T _PV. Is given a deviation between the temperature T _PV and the target value T _SV, and the manipulated variable MV _T is calculated. Therefore, in the region where the temperature T _PV is within the upper and lower limits, excessive fluctuations in the manipulated variable MV _T are suppressed, and the frequency of driving the exhaust damper 21, the return air damper 41, and the outside air introduction damper 31 is reduced. The energy consumption of the temperature and humidity system can be reduced. Further, in the present embodiment, a region exceeding the upper limit value of the temperature T _PV is the dead band is released, P term, I term, the manipulated variable MV _T obtained by adding all the terms of the D term is calculated. The same applies to humidity control by the humidity control PID controller 102.

<Other embodiments>
Although one embodiment of the present invention has been described above, other embodiments are conceivable for the present invention. For example, in the above-described embodiment, the dead zone control unit 110 is provided outside the temperature control PID adjuster 101 and the humidity control PID adjuster 102, but the dead zone control unit 110 is equivalent to the temperature control PID adjuster 101. And the humidity control PID controller 102 may be provided inside each of them.

DESCRIPTION OF SYMBOLS 101 ... PID controller for temperature control, 102 ... PID controller for humidity control, 10 ... Server room, 20, 30, 40, 50, 60, 80 ... Flow path, 70 ... Air handling unit, 71 ... Humidifier, 21 DESCRIPTION OF SYMBOLS ... Exhaust damper, 41 ... Return air damper, 31 ... Outside air introduction damper, 81 ... Humidification valve, 11 ... Temperature sensor, 12 ... Humidity sensor, 111, 112 ... Dead zone formation part.

Claims (4)

A temperature sensor for measuring the temperature in the controlled space;
A humidity sensor for measuring the humidity in the control target space;
An exhaust damper for adjusting the amount of air discharged to the outside of the air discharged from the control target space;
A return air damper for adjusting the amount of return air to be returned to the control target space out of the air discharged from the control target space;
An outside air introduction damper for adjusting the air volume introduced from the outside;
An air supply unit that includes a humidifier that adjusts the humidity of the air that has passed through the return air damper and the outside air introduction damper, and that returns the air whose humidity has been adjusted by the humidifier to the control target space;
A humidifying valve for adjusting the amount of water supplied to the humidifier;
Using the temperature measured by the temperature sensor as a control amount, an operation amount applied to the exhaust damper, the return air damper, and the outside air introduction damper is calculated based on a deviation between the control amount and a target value. A PID controller for temperature control;
A humidity control PID controller that calculates the operation amount to be applied to the humidifying valve based on the deviation between the control amount and the target value, with the humidity measured by the humidity sensor as a control amount;
Of the three manipulated variables calculated from the P term, I term, and D term of the temperature control PID adjuster and the humidity control PID adjuster under the condition that the control amount is within the upper and lower limit values of the set value, A dead zone control means for stopping any one or more manipulated variable outputs ,
The temperature control PID adjuster and the humidity control PID adjuster are speed type or position type PID adjusters, respectively, and the dead zone control means has a control amount of temperature or humidity within an upper and lower limit value. A temperature and humidity control system characterized by stopping output of the P term and the D term . A temperature sensor for measuring the temperature in the controlled space;
A humidity sensor for measuring the humidity in the control target space;
An exhaust damper for adjusting the amount of air discharged to the outside of the air discharged from the control target space;
A return air damper for adjusting the amount of return air to be returned to the control target space out of the air discharged from the control target space;
An outside air introduction damper for adjusting the air volume introduced from the outside;
An air supply unit that includes a humidifier that adjusts the humidity of the air that has passed through the return air damper and the outside air introduction damper, and that returns the air whose humidity has been adjusted by the humidifier to the control target space;
A humidifying valve for adjusting the amount of water supplied to the humidifier;
Using the temperature measured by the temperature sensor as a control amount, an operation amount applied to the exhaust damper, the return air damper, and the outside air introduction damper is calculated based on a deviation between the control amount and a target value. A PID controller for temperature control;
A humidity control PID controller that calculates the operation amount to be applied to the humidifying valve based on the deviation between the control amount and the target value, with the humidity measured by the humidity sensor as a control amount;
Of the three manipulated variables calculated from the P term, I term, and D term of the temperature control PID adjuster and the humidity control PID adjuster under the condition that the control amount is within the upper and lower limit values of the set value, A dead zone control means for stopping any one or more manipulated variable outputs,
The dead zone control means includes
In a state where the temperature measured by the temperature sensor exceeds a preset upper / lower limit value, or the humidity measured by the humidity sensor exceeds a preset upper / lower limit value,
When the operation amount applied to the exhaust damper, the return air damper, and the outside air introduction damper is an upper limit value or a lower limit value, and the operation amount applied to the humidification valve is neither an upper limit value nor a lower limit value In addition, the dead zone of the humidity control PID controller is canceled,
When the operation amount applied to the exhaust damper, the return air damper, and the outside air introduction damper is neither the upper limit value nor the lower limit value, and the operation amount applied to the humidifying valve is the upper limit value or the lower limit value In addition, the dead temperature zone of the temperature control PID controller is canceled. A temperature sensor for measuring the temperature in the controlled space;
A humidity sensor for measuring the humidity in the control target space;
An exhaust damper for adjusting the amount of air discharged to the outside of the air discharged from the control target space;
A return air damper for adjusting the amount of return air to be returned to the control target space out of the air discharged from the control target space;
An outside air introduction damper for adjusting the air volume introduced from the outside;
An air supply unit that includes a humidifier that adjusts the humidity of the air that has passed through the return air damper and the outside air introduction damper, and that returns the air whose humidity has been adjusted by the humidifier to the control target space;
A humidifying valve for adjusting the amount of water supplied to the humidifier;
Using the temperature measured by the temperature sensor as a control amount, an operation amount applied to the exhaust damper, the return air damper, and the outside air introduction damper is calculated based on a deviation between the control amount and a target value. A PID controller for temperature control;
A humidity control PID controller that calculates the operation amount to be applied to the humidifying valve based on the deviation between the control amount and the target value, with the humidity measured by the humidity sensor as a control amount;
Of the three manipulated variables calculated from the P term, I term, and D term of the temperature control PID adjuster and the humidity control PID adjuster under the condition that the control amount is within the upper and lower limit values of the set value, A dead zone control means for stopping any one or more manipulated variable outputs,
The temperature control PID adjuster and the humidity control PID adjuster are speed type or position type PID adjusters, respectively, and the dead zone control means has a control amount of temperature or humidity within an upper and lower limit value. , Stop the output of P term and D term,
The dead zone control means includes
In a state where the temperature measured by the temperature sensor exceeds a preset upper / lower limit value, or the humidity measured by the humidity sensor exceeds a preset upper / lower limit value,
When the operation amount applied to the exhaust damper, the return air damper, and the outside air introduction damper is an upper limit value or a lower limit value, and the operation amount applied to the humidification valve is neither an upper limit value nor a lower limit value In addition, the dead zone of the humidity control PID controller is canceled,
When the operation amount applied to the exhaust damper, the return air damper, and the outside air introduction damper is neither the upper limit value nor the lower limit value, and the operation amount applied to the humidifying valve is the upper limit value or the lower limit value In addition, the dead temperature zone of the temperature control PID controller is canceled. An auxiliary heat source for controlling the temperature of the air supplied from the air supply means to the space to be controlled;
The dead zone control means is configured such that the temperature measured by the temperature sensor exceeds a preset upper / lower limit value, or the humidity measured by the humidity sensor exceeds a preset upper / lower limit value, and The auxiliary heat source is activated when a situation in which all of the operation amounts applied to the damper, the return air damper, the outside air introduction damper, and the humidifying valve are at the upper limit value or the lower limit value continues for a predetermined time or longer. The temperature and humidity control system according to any one of claims 1 to 3, wherein

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