JP3175100B2 - Air conditioning control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the stability, responsiveness, and follow-up of control, and to prevent energy loss by hunting, and deterioration of an equipment for operation. SOLUTION: The temperature THW of hot water from a heat source is read (Step 101). The difference between the read the temperature THW of hot water and the supply air set temperature TSP is operated (Step 102), and the correction factor α1 corresponding to the difference between the hot water temperature THW and the supply air set temperature TSP is determined from the preset correction factor table (Step 103). The PID proportional band (heating PB) for heating is corrected by the determined correction factor α1 (Step 104), the control output is obtained using the newly corrected heating PB (Step 105), and the equipment for operation such as a hot water valve 4 is controlled (Step 106).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for obtaining a control output using a predetermined proportional band from a control set temperature and an actual measured temperature (control actual measured temperature) for the control set temperature. Control devices such as control valves and dampers to match the measured temperature with the control actual temperature, that is, the amount of water flowing into the heat exchanger (coil), the amount of air taken in (external air intake, return air), supply The present invention relates to an air conditioning control method for controlling air volume and the like.

[0002]

2. Description of the Related Art The ability of an air conditioner, such as an air conditioner, to generate cool air and warm air varies depending on factors such as the temperature of water supplied from a heat source, the amount of air supply, the temperature of outside air, and the amount of outside air intake. That is, the ability to generate cool air / warm air changes mainly due to the change in the heat exchange rate of the coil.

[0003]

However, in the prior art, it is assumed that the capacity of the air conditioner is always constant without considering the change in the capacity of the air conditioner, and the temperature control is performed while the proportional band of the PID is fixed. It is carried out. That is, as the PID proportional band of the temperature control process, a proportional band for heating (heating PB), a proportional band for cooling (cooling PB), and a proportional band for outside air cooling (external cooling PB) are predetermined as fixed values, and are controlled. Heating PB, cooling PB, external cooling PB from the set temperature and the control actual measured temperature
The control output is obtained by using the control output, and the control output controls the operation devices such as the control valve and the damper so that the control set temperature and the control actual measured temperature are made to coincide with each other. For this reason, when factors such as the water supply temperature, the supply air amount, the outside air temperature, and the outside air intake amount change, the control output becomes unstable and hunting may occur. When hunting occurs, useless energy is consumed and operating devices are deteriorated.

The present invention has been made in order to solve such a problem, and an object of the present invention is to improve control stability, responsiveness, and responsiveness, and to reduce energy loss due to hunting. An object of the present invention is to provide an air-conditioning control method capable of preventing deterioration of an operation device.

[0005]

In order to achieve such an object, a first invention (an invention according to claim 1) uses a proportional band predetermined from a control set temperature and a control actual measurement temperature. In an air-conditioning control method for obtaining a control output and controlling an operating device so that a control set temperature and a control actual measured temperature are made to match with each other, a predetermined control is performed in accordance with at least a difference between a water supply temperature from a heat source and a control set temperature. A correction coefficient is determined, and the proportional band is corrected using the determined correction coefficient.

According to the present invention, a predetermined correction coefficient is determined at least according to a difference between a water supply temperature from a heat source and a control set temperature, and a proportional band (PID proportionality) predetermined by the determined correction coefficient is determined. Band, PI proportional band, etc.), a control output is obtained using the corrected new proportional band, and the control output temperature matches the control set temperature with the measured control temperature. In this manner, operating devices such as control valves and dampers are controlled. In this case, as the control set temperature, the air supply set temperature determined for the air supply from the air conditioner, the indoor set temperature determined for the room temperature supplied with the air supply, and the return air to the air conditioner are For example, a return air set temperature determined in advance can be considered.

According to a second aspect of the present invention, a control output is obtained from a control set temperature and a measured control temperature using a predetermined proportional band, and a control set temperature and a measured control temperature are determined based on the control output. In the air conditioning control method of controlling the operating device so as to match the air temperature, at least one of the outside air temperature, the difference between the control set temperature and the outside air temperature, the outside air intake air volume, the supply air volume, and the water supply temperature from the heat source. A predetermined correction coefficient is determined according to a difference from the control set temperature, and the proportional band is corrected by the determined correction coefficient.

According to the present invention, at least one of the outside air temperature, the difference between the control set temperature and the outside air temperature, the outside air intake air amount, and the supply air amount, and the difference between the water supply temperature from the heat source and the control set temperature. A predetermined correction coefficient is determined in accordance with this, and a proportional band (PID) predetermined by the determined correction coefficient is determined.
Proportional band of temperature control process such as proportional band, PI proportional band)
Is corrected, and a control output is obtained by using the corrected new proportional band, and the control output controls operation devices such as a control valve and a damper such that the control set temperature and the control actual measured temperature match. . In this case, as the control set temperature, the air supply set temperature determined for the air supply from the air conditioner, the indoor set temperature determined for the room temperature supplied with the air supply, and the return air to the air conditioner are For example, a return air set temperature determined in advance can be considered.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments. FIG. 2 is an instrumentation diagram of an air conditioning control system to which the present invention is applied.

In FIG. 1, reference numeral 1 denotes an air conditioner, which comprises a cooling coil 3 to which cold water CW is supplied via a cold water valve 2, a heating coil 5 to which hot water HW is supplied via a hot water valve 4, and a blower 6. Have been. In the blower 6, 6a is a fan and 6b is an inverter. Further, the cold water CW reaches the cold water valve 2 from the cold heat source via the pump P1, is supplied to the cooling coil 3, and then returns to the cold heat source. The hot water HW reaches the hot water valve 4 from the heat source via the pump P2, is supplied to the heating coil 5, and returns to the heat source.

The operation of the inverter 6b, the cold water valve 2 and the hot water valve 4 in the air conditioner 1 is controlled by the controller 7, and the air supplied from the fan 6a of the air conditioner 1 is supplied indoors. . The controller 7, the supply air temperature set value from the air conditioner 1 (supply air set temperature) T _sp is given as the control set temperature, the measured value of the supply air temperature as measured temperature for the control set temperature (supply air measured Temperature) T _pv is provided via the supply air temperature sensor 8.

On the other hand, the supply air supplied from the air conditioner 1 to the room is discharged through the exhaust damper 9 after contributing to the air conditioning control in the room, and a part of the supply air is returned through the return air damper 10. Is returned to the air conditioner 1. And
The outside air is taken in at a predetermined rate via the outside air intake damper 11 with respect to the return air returned to the air conditioner 1.

The openings of the exhaust damper 9, the return air damper 10, and the outside air intake damper 11 are adjusted by a command from the controller 7. Further, the controller 7 is provided with a cold water temperature T from a cold heat source via the pump P1.
Hot water temperature _THW from the heat source via _CW and pump P2
Are provided via temperature sensors 12 and 13. Further, the front of the outdoor air intake damper 11 outside air wind velocity sensor 14 is provided, the controller 7 based on the outside air wind from the outside air wind velocity sensor 14 calculates the outdoor air Nyukazeryou V _in. The controller 7 includes an outside air temperature sensor 15.
The outside air temperature T _out is given via the control unit.

[Basic Operation of Controller 7] The controller 7 comprises a set value T _sp of the supply air temperature and an actually measured value T _{pv of the} supply air temperature.
From this, a predetermined heating PB (PID for heating)
Proportional band), cooling PB (PID proportional band for cooling), external cooling P
B obtains the control output using a (PID proportional band for outdoor air cooling), so as to match the actual measurement value T _pv of the supply air temperature and the set value T _sp of the supply air temperature by the control output, the cold water valve 2, Hot water valve 4, inverter 6b, exhaust damper 9, return air damper 1
0, the outside air intake damper 11 is controlled. That is, it controls the amount of water flowing to the cooling coil 3, the amount of water flowing to the heating coil 5, the amount of air taken in (the amount of outside air taken in, the amount of returned air), the amount of supplied air, and the like.

[PID Proportional Band Correction] Controller 7
_Are the air supply air volume V _out from the air conditioner 1, the air supply set temperature T _sp
And the deviation of the outside air temperature T _out, outdoor air Nyukazeryou V _in, the difference between the hot water temperature T _HW and supply air set temperature T _sp from the heat source, the cold water temperature T _CW and the supply air set temperature T _sp from the cold source The predetermined correction coefficients α1, α2, α3 are determined according to the difference between the heating PB and the cooling P based on the determined correction coefficients α1, α2, α3.
B, correct the externally cooled PB.

[Simple Correction Example of PID Proportional Band] The correction of the PID proportional band by the controller 7 will be described with a simple correction example in order to speed up the understanding. Controller 7
It reads the hot water temperature T _HW from heat source via the thermometer 13 (step 101 shown in FIG. 1). Then, the difference between the read calculates the difference between hot water temperature T _HW and supply air set temperature T _sp (step 102), the hot water temperature from the correction coefficient table is predetermined T _HW and supply air set temperature T _sp Is determined (step 103). Then, the heating PB is corrected by the determined correction coefficient α1 (step 104), a control output is obtained using the corrected new heating PB (step 105), and operating devices such as the hot water valve 4 are controlled (step 104). Step 106). Control device 7
Periodically repeats the correction of the heating PB.

[Practical Correction of PID Proportional Band] In the above description, as a simple correction example, the hot water temperature T
It has dealt with the case of correcting the heat PB from the difference between the _HW and the supply air set temperature T _sp. However, the PID in the controller 7
The correction of the proportional band is more complicated. Hereinafter, the actual correction of the PID proportional band by the controller 7 will be described with reference to FIG.

[Correction Coefficient A Based on Supply Air Volume] The controller 7 calculates a correction coefficient A from the output to the inverter 6b (supply fan inverter output (%)) (step 3).
01). That is, the controller 7 uses the air supply fan inverter output (%) as a substitute value for the air supply air volume _Vout , and
The correction coefficient A is obtained with reference to the correction coefficient table shown in FIG. In this case, the air supply fan inverter output 25-60%
Thus, the correction coefficient A is set to 2.5 to 1.0. This is a correction factor to make the process gain of the supply air temperature larger than the adjustment time at the time of the fan rating when the air supply fan inverter output is small.

[Correction coefficients B and C based on outside air temperature] The controller 7 calculates correction coefficients B and C from the deviation between the supply air set temperature _Tsp and the outside air temperature _Tout (step 30).
2,303). That is, the controller 7 obtains the correction coefficients B and C from the deviation (T _sp −T _out ) between the supply air set temperature T _sp and the outside air temperature T _out with reference to the correction coefficient table shown in FIG. In this case, the correction coefficient B is obtained from the characteristic I shown by the solid line in the figure, and the correction coefficient C is obtained from the characteristic II shown by the one-dot chain line in the figure.

[0020] The correction coefficient B is greater the lower the outside air temperature T _out to the supply air set temperature T _sp, the deviation is 0.0
It is set to 1.0 to 3.0 at 10.0. Correction coefficient C becomes larger the higher the outside air temperature T _out against supply air set temperature T _sp, the deviation is a 0.0-10.0 1.0-3.0. This is a correction factor for the outside air temperature T _out to greatly affect the supply air temperature control process in both the minimum outside air intake control and the outside air cooling control.

[0021] [outdoor air corrected by input air volume coefficient D] controller 7, the outdoor air Nyukazeryou V _in, obtaining the correction coefficient D (step 304). That is, the controller 7
To calculate the outdoor air Nyukazeryou V _in based on the outside air wind speed from the outside air wind speed sensor 14. Then, to convert the outdoor air Nyukazeryou V _in a fan rated air volume ratio, obtaining the correction coefficient D as referring to the correction coefficient table shown in FIG. In this case, the fan rated air flow rate ratio is 0 to 100%, and the correction coefficient D is 0 to 3.
It is set to 0.

[Correction coefficient E based on hot water temperature] The controller 7 calculates the hot water temperature _THW from the hot heat source and the supply air set temperature _Tsp.
The correction coefficient E is obtained from the difference (step 305).
That is, the controller 7 determines the correction coefficient E from the difference ( _THW - _Tsp ) between the hot water temperature _THW and the supply air set temperature _Tsp with reference to the correction coefficient table shown in FIG. In this case, the value of T _HW -T _sp is at 10.0 to 20.0, the correction coefficient E is set to 0-5.

[Correction coefficient F based on cold water temperature] The controller 7 calculates the cold water temperature T _CW from the cold heat source and the supply air set temperature T _sp.
Then, a correction coefficient F is obtained from the difference (step 306).
That is, the controller 7 obtains the correction coefficient F from the difference between the chilled water temperature T _CW and the supply air set temperature T _sp (T _CW −T _sp ) with reference to the correction coefficient table shown in FIG. In this case, the value of T _CW -T _sp is at -10.0～-20.0, the correction coefficient E is set to 0-5.

[Final correction coefficient α from correction coefficients A to E]
The controller 7 sets a limit on the rate of change (step 307) and adds the correction coefficient A obtained in step 301 to the steps 310 and 3.
11, 312. Further, the correction coefficient B obtained in step 302 is sent to the addition step 311, and the correction coefficient B is multiplied by the correction coefficient D obtained in step 304 and the correction coefficient F obtained in step 306 (step 30).
8) Send to addition step 310.

Further, the controller 7 executes step 303
Is multiplied by the correction coefficient C obtained in step 304 and the correction coefficient D obtained in step 304 (step 309).
Send to In the addition step 310, the correction coefficient A through step 307 and the correction coefficient “D” through step 308
.B · F ”to obtain a correction coefficient α2. In addition step 311, correction coefficient A through step 307 is used.
And the correction coefficient B obtained through step 302 are added to obtain a correction coefficient α3. In addition step 312, correction coefficient A via step 307, correction coefficient “D · C” via step 309, and correction coefficient E via step 305
Are added to obtain a correction coefficient α1.

Then, in step 313, the cooling P
The cooling PB is determined by multiplying the initial value of B by the correction coefficient α2 (step 316). In step 314, the external cooling PB is determined by multiplying the initial value of the external cooling PB by the correction coefficient α3 (step 317). Step 3
At 15, the heating PB is determined by multiplying the initial value of the heating PB by the correction coefficient α1 (step 318).

In this manner, the controller 7 determines the heating PB, the cooling PB, and the external cooling PB, that is, the heating PB, the cooling PB, and the external cooling PB according to the correction coefficients α1, α2, and α3.
During heating control, operating devices such as the chilled water valve 2 are controlled by using the heating PB during heating control. During cooling control, operating devices such as the hot water valve 4 are controlled by using the cooling PB to obtain control output. Then, at the time of the external cooling control, the operation output such as the external air intake damper 11 is controlled by obtaining the control output using the external cooling PB, and the supply air set temperature _Tsp and the supply air actual measurement temperature _Tpv are made to coincide.

In this embodiment, the correction coefficients B and C are obtained from the deviation between the set air supply temperature T _sp and the outside air temperature T _out.
It was to seek, may be obtained only from the outside air temperature T _out without taking the difference between the supply air temperature setting T _sp. That is, at the time of cooling control and external cooling control, FIG.
The correction coefficient B may be obtained by referring to the correction coefficient table as shown in FIG. 9A, and the correction coefficient C may be obtained by referring to the correction coefficient table as shown in FIG.

In this embodiment, the set air supply temperature T _sp is set as the control set temperature. However, the indoor set temperature set for the room to which the air supply from the air conditioner 1 is supplied is set to the control set temperature. The return air set temperature set for the return air to the air conditioner 1 may be set as the control set temperature.

In this embodiment, the heating PB, the cooling PB, and the external cooling PB are set as the PID proportional bands of the temperature control process.
Although the example in which B is provided has been described, the same applies to the case where a PID proportional band that controls the temperature control process collectively is provided, that is, the PID proportional band is not provided for each process such as heating, cooling, and external cooling. It is possible to apply. Further, the proportional band of the temperature control process is not limited to the PID proportional band, but may be a PI proportional band or the like.

[0031]

As apparent from the above description, according to the present invention, in the first invention, hunting due to at least a change in the temperature of water supplied from the heat source does not occur.
It is possible to improve control stability, responsiveness, and followability, and it is possible to prevent energy loss and deterioration of operating devices due to hunting. According to the second aspect, hunting due to a combination of a change in at least one of the outside air temperature, the outside air intake air amount, and the supply air amount and a change in the water supply temperature from the heat source does not occur. And responsiveness can be improved, and energy loss due to hunting and deterioration of operating devices can be prevented.

[Brief description of the drawings]

FIG. 1 is a diagram showing a PI in an air conditioning control system shown in FIG.
9 is a flowchart for explaining a simple correction example of a D proportional band.

FIG. 2 is an instrumentation diagram of an air conditioning control system to which the present invention is applied.

FIG. 3 is a flowchart for explaining actual correction of a PID proportional band in the air conditioning control system.

FIG. 4 is a diagram illustrating a correction coefficient table when a correction coefficient A is obtained.

FIG. 5 is a diagram exemplifying a correction coefficient table for obtaining correction coefficients B and C;

FIG. 6 is a diagram illustrating a correction coefficient table when a correction coefficient D is obtained.

FIG. 7 is a diagram illustrating a correction coefficient table when a correction coefficient E is obtained.

FIG. 8 is a diagram illustrating a correction coefficient table when a correction coefficient F is obtained.

FIG. 9 is a diagram exemplifying a correction coefficient table in a case where the correction coefficients B and C are obtained from only the outside air temperature without taking a deviation from the supply air set temperature.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Air conditioner, 2 ... Cold water valve, 3 ... Cooling coil, 4 ... Hot water valve, 5 ... Heating coil, 6 ... Blower, 6a ... Fan, 6b
... Inverter, 7 ... Controller, 8 ... Supply temperature sensor, 9 ... Exhaust damper, 10 ... Return air damper, 11 ... Outside air intake damper, 12,13 ... Temperature sensor, 14 ... Outside air wind speed sensor, 15 ... Outside air temperature sensor .

Claims (2)

(57) [Claims] A control output is obtained using a predetermined proportional band from a control set temperature and an actually measured temperature for the control set temperature, and the control output is made to match the control set temperature with the actually measured temperature using the control output. In the air conditioning control method for controlling the operation device, a predetermined correction coefficient is determined at least according to a difference between a water supply temperature from a heat source and the control set temperature, and the proportional band is corrected by the determined correction coefficient. An air-conditioning control method comprising: 2. A control output is determined using a predetermined proportional band from a control set temperature and an actual measured temperature for the control set temperature, and the control output is made to match the control set temperature with the measured temperature using the control output. An air conditioning control method for controlling an operating device, comprising: at least one of an outside air temperature, a difference between the control set temperature and the outside air temperature, an outside air intake air volume, and a supply air volume, and a water supply temperature from a heat source and the control set temperature. A predetermined correction coefficient is determined in accordance with the difference between the two, and the proportional band is corrected using the determined correction coefficient.