JPH10292941A - Air conditioning control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the consumption of cold water at a minimum through the ability to control indoor temperature and humidity as setting values in cooling operation. SOLUTION: A cooling control part 1 and a dehumidifying control part 4 compute respective control output amounts AMVC and AMVE, and a maximum selecting circuit 7 outputs the larger value of these as the output amount of travel control of a cold water valve. On the other hand, a PID variation rate computing part 9 of a re-heating control part 8A also computes a variation ΔMV based on the input of a measured indoor temperature and a setting indoor temperature. Supposing that α is a predetermined positive value, when the measured indoor humidity becomes (the setting indoor humidity) -α or lower, a switching condition determination circuit 14 switches a contact point 13c of a switch circuit 13 to an input terminal 13b. Supposing, for example, that a switching condition is α=2% and the setting indoor humidity is set at 50%, the circuit 14 switches the contact point 13c from the input terminal 13a to 13b side when the measured value becomes 48% or lower. Thereby, the control output amount AMVH from a valve opening computing part 10 is not increased, and the increase in the unnecessary output amount AMVE is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning control device used in various buildings such as an office building, a residential building, and a multipurpose intelligent building.

[0002]

2. Description of the Related Art FIG. 6 is an explanatory diagram showing a schematic configuration of an air conditioner. In this figure, air from the outside and air to be recirculated pass through an air filter 62, a cooling coil 63, and a heating coil 64 of an air conditioner 61, and are sent to a room 67 by a fan 66. The air in the room 67 is discharged to the outside by the discharge fan 68,
A part is recirculated to the air conditioner 61 side.
The temperature T and the humidity H of the room 67 are measured by the controller 69. And the controller 6
Numeral 9 controls the opening amounts of the cold water valve 70, the hot water valve 71, and the steam valve 72 based on this measurement. The steam valve 72 is used for humidification control during heating.

In FIG. 6, Ta and Xa are the temperature and humidity of the outside air, Tm and Xm are the temperature and humidity at the outlet of the air filter 62, Tc and Xc are the temperature and humidity at the outlet of the cooling coil 63, and TH and XH are the heating coils. 64 temperature and humidity, TD
, XD are the temperature and humidity at the outlet side of the air conditioner 61, TR, XR
Is the temperature and humidity of the room 67. TRD is the temperature near the outlet of the room 67, and TRA is the temperature of the recirculated air. GOA is the flow rate of air introduced from outside,
GRA is the flow rate of the recirculated air, GD is the flow rate sent into the room 67 by the fan 66, and GD = GOA + G
RA. GLK is the leakage flow rate, GRT is the flow rate sent out by the fan 68, GE is the flow rate discharged to the outside,
GRT = GE + GRA.

FIGS. 7 and 8 are characteristic diagrams showing simulation examples in a case where only room temperature control is performed without performing humidity control in the above-described air conditioner. As is clear from FIG. 8, the room temperature is finally the set value 2
Although the temperature is controlled at 5 ° C. and is constant, the indoor humidity (relative humidity) becomes constant, and as shown in FIG.
It is in a state of rising.

[0005] If the room humidity increases in this way, it is not possible to obtain sufficient comfort. Therefore, it is usual to perform dehumidification control together with cooling control. Both the cooling control and the dehumidification control are performed by adjusting the opening of the same chilled water valve, and the larger one of the calculated value of the cooling control and the calculated value of the dehumidification control is selected, and this is the actual value. Is output as the chilled water valve opening. However, when the output amount of the dehumidification control is larger than the output amount of the cooling control, the room temperature may be lower than the set temperature due to supercooling. Therefore, in such a case, the reheating control is performed by opening the hot water valve, and the control for returning the excessively cooled room temperature to the original temperature is performed.

FIG. 9 is a block diagram showing a configuration of a conventional air conditioning control device having a function of performing such reheating control. In this figure, a cooling control unit 1 has a PID change rate calculation unit 2 and a valve opening calculation unit 3. The PID change rate calculation unit 2 outputs a change amount ΔMV of the valve opening to the valve opening calculation unit 3 for each predetermined sampling cycle based on the input of the room temperature measurement value and the room temperature set value,
The valve opening calculating section 3 outputs a value obtained by adding the current change amount ΔMV to the previous valve opening amount AMVC as the current valve opening amount.

[0007] Similarly to the cooling control unit 1, the dehumidification control unit 4 has P
An ID change rate calculator 5 and a valve opening calculator 6 are provided. The PID change rate calculating unit 5 outputs a change amount ΔMV of the valve opening to the valve opening calculating unit 3 for each predetermined sampling cycle based on the input of the indoor humidity measurement value and the indoor humidity set value. The opening calculation unit 3 outputs a value obtained by adding the current change amount ΔMV to the previous valve opening amount AMVE as the current valve opening amount.

The maximum value selection circuit 7 performs so-called high select control, and uses the larger one of the valve opening amounts AMVC and AMVE calculated by the valve opening calculators 3 and 6 as the actual value of the chilled water valve. It is output as a control opening amount.

The reheating control unit 8 also has a PID change rate calculation unit 9 and a valve opening calculation unit 10 like the cooling control unit 1 and the dehumidification control unit 4. The PID change rate calculating unit 9 outputs a change amount ΔMV of the valve opening to the valve opening calculating unit 10 at every predetermined sampling cycle based on the input of the room temperature measurement value and the room temperature set value. The calculation unit 10 calculates the current change amount ΔM to the previous valve opening amount AMVH.
The value obtained by adding V is output as the current valve opening amount.

FIG. 10 is an air line diagram showing a change in the state of air when cooling control, dehumidification control, and reheating control are performed by the air conditioning control device having the configuration shown in FIG. Corresponds to the code shown in FIG.
Point C in FIG. 10 indicates the position on the outlet side of the cooling coil 63, and the state of this point C is determined by the output of the maximum value selection circuit 7 (at the time of high selection). The point D indicates the position on the exit side of the air conditioner 61 (this point is also the point H on the exit side of the heating coil in this psychrometric chart), and the reheating control unit 8.
Is determined by the control output amount.

FIGS. 11 and 12 are characteristic diagrams showing simulation examples in the case where cooling control with humidity control is performed by the air-conditioning control device having the configuration shown in FIG. FIG. 12 showing the change in the room temperature is the same as FIG. 8, but FIG. 11 showing the change in the room humidity (relative humidity) is different from the case of FIG. 9 in that the room humidity is controlled to around the set value of 50%. ing.

FIG. 13 shows the change characteristics of the cold water amount and the hot water amount, that is, the opening control output amounts of the cold water valve and the hot water valve, and the maximum value of both the cold water amount and the hot water amount is two.
[Kg / s].

[0013]

As shown in the humidity change characteristic of FIG. 11, the room humidity is controlled to be around 50%, which is the set value, but the room humidity is reduced to 50% over time. The level is slightly up and down. in this case,
The reason why the room humidity exceeds 50% near the center of FIG. 11 is that the opening amount of the chilled water valve has already been 2 [kg].
/ S], that is, the dehumidification load exceeds the installed capacity, and it can be said that it is unavoidable.

However, the fact that the room humidity is lower than 50% in the latter half of FIG. 11 can be said to have room for improvement. This is because the control output amount AMVC of the cooling control unit 1 does not decrease so much as shown in FIG. 13 even though the dehumidification load decreases in the latter half of FIG. 11 (the dehumidification control unit). Control output amount A of 4
Although MVE sharply decreases, AMVC becomes the actual chilled water valve opening control output amount for high select control. ). That is, in the latter half of FIG. 11, good feedback control is not performed, and the result is that excessive dehumidification is performed.

On the other hand, the reheating control unit 8 outputs the control output amount AMVH and outputs the hot water valve so that the temperature drop caused by the excessive dehumidification is canceled and the room temperature is maintained at the set value of 25 ° C. Is controlled. in this way,
Increasing the opening of the hot water valve with the opening of the cold water valve increased is not preferable from the viewpoint of energy saving. Furthermore, during the dehumidification control, the reheating control unit 8
Increasing the opening degree of the hot water valve by increasing the control output amount of the above means that the room humidity cannot be controlled to the set value after all. That is, in the conventional air-conditioning control device, when the dehumidification control is performed during the cooling operation, the humidity does not reach the set value or the cold water and the hot water are consumed unnecessarily, which is contrary to the demand for energy saving. There was something.

The present invention has been made in view of the above circumstances, and it is possible to control the room temperature and the room humidity during a cooling operation according to set values, and to suppress the consumption of cold and hot water to a minimum. It is an object of the present invention to provide an air-conditioning control device capable of performing such operations.

[0017]

According to a first aspect of the present invention, there is provided a cooling control unit for calculating a cooling control output amount based on input of a room temperature measurement value and a room temperature set value. A dehumidification control unit that calculates a dehumidification control output amount based on the input of the indoor humidity measurement value and the indoor humidity set value,
A reheating control unit that calculates a reheating control output amount to be performed when a supercooling control state is established by cooling control or dehumidification control based on input of a room temperature measurement value and a room temperature set value, and an opening degree of a chilled water valve. In the air-conditioning control device that uses a larger value of the respective calculated values of the cooling control unit and the dehumidification control unit as the control output amount, the reheating control unit inputs the room temperature measurement value and the room temperature set value. Is output as it is as the first control output amount, or a value obtained by removing the positive rate of change from the first control output amount is used as the second control output amount. Output,
A reheating control output amount switching circuit; and a switching condition determining circuit that determines a predetermined condition as to which of the first and second control output amounts the reheating control output amount switching circuit should output. Wherein the reheating control output amount switching circuit outputs one of the first and second control output amounts based on a determination result of the switching condition determination circuit. I do.

According to a second aspect of the present invention, in the first aspect of the present invention, the reheating control output amount switching circuit includes the second heating control circuit.
The predetermined condition when the control output amount is to be output is characterized in that α is a predetermined positive value and the measured indoor humidity is equal to or less than the set indoor humidity −α.

According to a third aspect of the present invention, in the first aspect of the present invention, the reheating control output amount switching circuit includes the second reheating control output amount switching circuit.
The predetermined condition when the control output amount is to be output is a case where the calculated value of the cooling control unit is larger than the calculated value of the dehumidification control unit.

According to a fourth aspect of the present invention, in the first aspect of the present invention, when α is a predetermined positive value and the measured indoor humidity is equal to or less than the set indoor humidity −α, Further, only the operation value of the dehumidification control unit is used as the control output of the opening degree of the chilled water valve.

According to a fifth aspect of the present invention, in the first aspect of the invention, the room temperature set value input by the reheating control unit is set to be smaller than the room temperature set value input by the cooling control unit. It is characterized by being lowered by a predetermined temperature.

According to a sixth aspect of the present invention, in the first aspect of the present invention, the cooling control unit and the heating control unit are controlled so that the air conditioning comfort index becomes a predetermined set value. It is characterized by automatically calculating each set value of a room temperature set value and a humidity set value of the dehumidification control unit.

According to a seventh aspect of the present invention, in accordance with the sixth aspect of the present invention, a set value of an air conditioning comfort index for automatically determining a room temperature set value of the reheating control unit is set to a room temperature of the cooling control unit. The air conditioning comfort index for automatically determining the set value is smaller than the set value.

According to an eighth aspect of the present invention, in the first aspect of the invention, the cooling control unit, the dehumidification control unit, and the reheating control unit control each control amount by PID calculation. The operation is performed.

According to a ninth aspect of the present invention, in the invention according to any one of the first to seventh aspects, the cooling control unit, the dehumidification control unit, and the reheating control unit control each control amount by fuzzy arithmetic. The operation is performed.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. However, the same components as those in FIG. 9 are denoted by the same reference numerals, and redundant description will be omitted. FIG. 1 is a block diagram showing the configuration of the embodiment of the present invention. FIG. 1 differs from FIG. 9 in the configuration of the reheating control unit 8A. The reheating control unit 8A includes a reheating control output amount in addition to the PID change rate calculation unit 9 and the valve opening calculation unit 10. Switching circuit 11
And a switching condition determination circuit 14. The reheating control output amount switching circuit 11 includes a minimum value selection circuit 12 and a switch circuit 13.

The minimum value selection circuit 12 receives the change amount ΔMV from the PID change rate calculator 9 and a fixed value of zero, and outputs the smaller one of these values. That is, the minimum value selection circuit 12 calculates the change amount ΔM
If V is a positive value, zero is output and the change amount ΔMV
Is negative, the negative change amount ΔMV is output to eliminate the positive change rate.

The switch circuit 13 has an input terminal 13 for directly inputting the change amount ΔMV from the PID change rate calculator 9.
a, and an input terminal 13b for inputting an output from the minimum value selection circuit 12, and these input terminals
It is connected to the valve opening calculating section 10 via c. The contact 13c is normally connected to the input terminal 13a, but can be switched to the input terminal 13b by the switching condition determination circuit 14 in a predetermined case.

The switching condition determination circuit 14 receives the measured indoor humidity value and the set indoor humidity value, and sets α as a predetermined positive value so that the measured indoor humidity value falls below the set indoor humidity value −α. In the event that the contact 13
c is switched to the input terminal 13b side.

Next, the operation of FIG. 1 will be described. The cooling control unit 1 and the dehumidification control unit 4 calculate the control output amounts AMVC and AMVE, respectively, as described with reference to FIG. 9, and the maximum value selection circuit 7 uses the larger one of these values to open the chilled water valve. Output as the degree control output amount. on the other hand,
The PID change rate calculation unit 9 of the reheating control unit 8A also receives the room temperature measurement value and the room temperature set value, and calculates the change amount ΔMV based on these values. The amount of change ΔMV is output to the valve opening calculating section 10 through the input terminal 13a and the contact 13c of the switch circuit 13. Valve opening calculator 10
Is the change amount ΔMV of the current valve opening amount AMVH
Is output as the current valve opening amount.

As described above, while the cooling operation is being performed and α is set to a predetermined positive value and the measured indoor humidity becomes equal to or less than the set indoor humidity −α, the switching condition determination circuit 14
Switches the contact 13c of the switch circuit 13 to the input terminal 13b side. For example, in the case of the present embodiment, α of the switching condition of the switching condition determination circuit 14 is set to 2%. If the indoor humidity set value is set to 50%, when the indoor humidity measured value becomes 48% or less, the switching condition determination circuit 14
Switches the contact 13c from the input terminal 13a to the input terminal 13b. As a result, the control output amount AMVH from the valve opening calculating unit 10 does not change at least in an increasing tendency, and the unnecessary control output amount AMVH
Is suppressed.

FIG. 2 is a block diagram showing the configuration of another embodiment of the present invention. FIG. 2 is different from FIG. 1 in the switching condition of the switching condition determining circuit 14. The switching condition determining circuit 14 of the reheating control unit 8B in FIG. The input is AMVC and AMVE. When the control output amount AMVC exceeds AMVE, the switching condition determination circuit 14
The third contact 13c is switched from the input terminal 13a side to the 13b side. Control output AMVC of cooling control unit 1
Exceeds the control output amount AMVE of the dehumidification control unit 4, which means that it is no longer necessary to further increase the amount of hot water. Therefore, the switching condition determination circuit 14 selects the change amount ΔMV from the minimum value selection circuit 12 from which the positive rate of change has been removed, and
To send to.

FIGS. 3, 4 and 5 show the switching condition judging circuit 14 of the air-conditioning control device having the construction of FIG. 1 when the switching condition judging circuit 14 determines that the AMVC which is the judging condition of FIG. 2 exceeds AMVE. It is a figure which shows the example which simulated the dehumidification control which added the condition of switching from input terminal 13a to 13b by OR.

In the result of humidity control shown in FIG. 3, the room humidity slightly exceeds 50% of the set value at the center, similarly to the result of the conventional dehumidification control (FIG. 11). The operation amount of such a chilled water valve has reached the maximum value of 2 kg / s (FIG. 5), and the dehumidification load exceeds the installed capacity, which is unavoidable. However, in the latter half where the dehumidification load has been reduced, the room humidity is well maintained at 50% (excess dehumidification has been performed with the humidity being lower than 50% in the latter half of the conventional method (FIG. 11). ). As a result, as can be seen from FIG. 5, the chilled water flow rate (AMVE) in the latter half of FIG.
Consumption) has been reduced (energy saving effect). In FIG. 13 of the conventional method, AMVE drops sharply in the latter half, but AMVC hardly drops (the actual operation amount of the chilled water valve is selected to be larger between AMVE and AMVC). In the latter half of FIG. 5, the consumption of the cold water flow rate is reduced as compared with FIG. 13, so that the load of the reheating is reduced so that the figure does not seem to be small. However, the consumption of the hot water flow rate (AMVH) is correspondingly accordingly. It is decreasing (energy saving effect). The room temperature set value of the room temperature control is 25 ° C., as shown in FIG.

The basic embodiment of the present invention is shown in FIG.
And the configuration shown in FIG. 2, but also includes the following forms.

(1) In the above embodiment, by providing the maximum value selection circuit 7, the control output amounts AMVC, AMVE
Is selected as the chilled water valve opening control output amount.If α is a predetermined positive value and the indoor humidity measurement value is equal to or less than the indoor humidity set value-α, dehumidification is performed. Only the control output amount AMVE of the control unit 4 may be employed as the chilled water valve opening control amount. Thereby, the controllability of the dehumidification control can be further improved.

(2) The room temperature set value of the PID change rate calculator 9 of the reheating control output amount switching circuit 11 shown in FIGS. 1 and 2 is set lower than the set value of the PID change rate calculator 2 by a predetermined temperature. You may. For example, the room temperature set value during the cooling operation in building air conditioning is about 2 in consideration of energy saving.
Usually, the temperature is set to 5 ° C., which is higher than the room temperature set value (about 22 ° C.) during the heating operation in winter. Therefore, the PI of the reheating control output amount switching circuit 11
By setting the room temperature set value of the D change rate calculation unit 9 to be lower than 25 ° C., energy saving can be achieved, and
Comfort can be satisfied.

(3) It is possible to use one that automatically calculates the room temperature set value (or humidity set value) in FIGS. 1 and 2 of the above embodiment by the following control device.

Accordingly, an air conditioning comfort index (PMV: Predicted Mean V) corresponding to each air conditioning system and its occupants is disclosed.
ote) is learned, and a set value is automatically obtained so that the index falls within a comfortable range and satisfies energy saving, so that dehumidification control with more comfort and greater energy saving effect can be realized.

(4) The air conditioning comfort index PMV in (3) above
When performing air conditioning control in consideration of
Setting of the air conditioning comfort index for automatically determining the room temperature set value of the D change rate calculation unit, and setting of the air conditioning comfort index for automatically determining the room temperature set value of the PID change rate calculation unit of the cooling control You may make it smaller than a value. Thus, as in the case of the above (2), energy can be saved and comfort can be satisfied.

(5) Cooling control unit 1, dehumidification control unit 4, and reheating control output amount switching circuit 11 in the above embodiment.
Has a configuration having PID change rate calculation units 2, 5 and 9 for performing PID calculation, but may have a configuration having a fuzzy calculation unit for performing fuzzy calculation instead of these PID change rate calculation units.

[0042]

As described above, according to the present invention, the indoor temperature and the indoor humidity can be controlled according to the set values during the cooling operation, and the consumption of the cold water and the hot water can be suppressed to a minimum. It is possible to realize an air-conditioning control device capable of performing the control.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of another embodiment of the present invention.

FIG. 3 is a characteristic diagram of a humidity change in a simulation example by the air-conditioning control device in FIG. 1;

FIG. 4 is a characteristic diagram of a temperature change in a simulation example by the air conditioning control device of FIG. 1;

FIG. 5 is a characteristic diagram of a change in a cold water amount and a hot water amount in a simulation example by the air conditioning control device in FIG. 1;

FIG. 6 is an explanatory diagram showing a schematic configuration of an air conditioner.

FIG. 7 is a characteristic diagram of a humidity change in a simulation example in the air conditioner of FIG. 6;

FIG. 8 is a characteristic diagram of a temperature change in a simulation example in the air conditioner of FIG. 6;

FIG. 9 is a block diagram showing a configuration of a conventional air conditioning control device.

FIG. 10 is an air line diagram showing a change in the state of air when control is performed by the air conditioning control device of FIG. 9;

FIG. 11 is a characteristic diagram of a humidity change in a simulation example by the air-conditioning control device in FIG. 9;

12 is a characteristic diagram of a temperature change in a simulation example by the air-conditioning control device of FIG. 9;

FIG. 13 is a characteristic diagram of a change in a cold water amount and a hot water amount in a simulation example by the air conditioning control device in FIG. 9;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Cooling control unit 1 2,5,9 PID change rate calculation unit 3,6,10 Valve opening calculation unit 4 Dehumidification control unit 7 Maximum value selection circuit 8,8A, 8B Reheating control unit 11 Reheating control output amount switching Circuit 12 Minimum value selection circuit 13 Switch circuit 13a, 13b Input terminal 13c Contact 14 Switching condition determination circuit 61 Air conditioner 62 Air filter 63 Cooling coil 64 Heating coil 66, 68 Fan 67 Indoor 70 Cold water valve 71 Hot water valve 72 Steam valve

Continuation of front page (72) Inventor Nobutaka Nishimura 1-1-1, Shibaura, Minato-ku, Tokyo Inside Toshiba Corporation Head Office

Claims (9)

[Claims] 1. A cooling control unit for calculating a cooling control output amount based on an input of a room temperature measurement value and a room temperature set value, and calculating a dehumidification control output amount based on an input of a room humidity measurement value and an indoor humidity set value. A dehumidification control unit, based on the input of the room temperature measurement value and the room temperature set value, a reheating control unit that calculates a reheating control output amount to be performed when a supercooling control state is established by cooling control or dehumidification control, In the air-conditioning controller configured to use a larger one of the calculated values of the cooling control unit and the dehumidification control unit as the opening control output amount of the chilled water valve, the reheating control unit includes the room temperature measurement value and The reheat control output amount calculated based on the input of the room temperature set value is output as it is as the first control output amount, or the value obtained by removing the positive change rate from the first control output amount is the second control output amount. Control output and A reheating control output amount switching circuit, which outputs a reheating control output amount, and a switching condition determination circuit that determines a predetermined condition as to which of the first and second control output amounts the reheating control output amount switching circuit should output. Wherein the reheating control output amount switching circuit outputs one of the first and second control output amounts based on a determination result of the switching condition determination circuit. An air conditioning control device characterized by the above-mentioned. 2. The air-conditioning control device according to claim 1, wherein the predetermined condition when the reheating control output amount switching circuit is to output the second control output amount is that α is a predetermined positive value. And an indoor humidity measured value is equal to or less than an indoor humidity set value -α. 3. The air-conditioning control device according to claim 1, wherein the predetermined condition when the reheating control output amount switching circuit is to output the second control output amount is such that the calculated value of the cooling control unit is An air-conditioning control device characterized in that the air-conditioning control value is larger than a calculation value of the dehumidification control unit. 4. The air-conditioning control apparatus according to claim 1, wherein α is a predetermined positive value, and when the measured indoor humidity is equal to or less than the set indoor humidity −α, the dehumidification control is performed. An air conditioning control device, wherein only the operation value of the section is used as the control output amount of the opening of the chilled water valve. 5. The air conditioning control device according to claim 1, wherein a room temperature set value input by the reheating control unit is lower by a predetermined temperature than a room temperature set value input by the cooling control unit. An air conditioning control device characterized by the following. 6. The air-conditioning control device according to claim 1, wherein the cooling control unit, the room temperature set value of the heating control unit, and the air-conditioning comfort index are set to a predetermined value. And automatically calculating each set value of the humidity set value of the dehumidification control unit. 7. The air-conditioning control device according to claim 6, wherein a set value of an air-conditioning comfort index for automatically determining a room temperature set value of the reheating control unit and a room temperature set value of the cooling control unit are automatically set. An air-conditioning control device characterized in that the air-conditioning comfort index is smaller than a set value of the air-conditioning comfort index for determination. 8. The air conditioning control device according to claim 1, wherein the cooling control unit, the dehumidification control unit, and the reheating control unit calculate each control amount by a PID calculation. An air-conditioning control device, characterized in that: 9. The air-conditioning control device according to claim 1, wherein the cooling control unit, the dehumidification control unit, and the reheating control unit calculate each control amount by a fuzzy calculation. An air-conditioning control device, characterized in that: