JP5912760B2 - Air conditioning control system and air conditioning control method - Google Patents

Description

  The present invention relates to an air conditioning control system that controls the opening degree of a valve provided in a supply passage of a heat medium to a heat exchanger of an air conditioner, and in particular, controls that suppress an excessive flow rate of the heat medium to the heat exchanger. The present invention relates to a technique for simply calculating an energy saving amount when performing.

  Conventionally, in an air conditioning control system, a fan coil unit (FCU) is provided, and cold / hot water is supplied to a coil which is a heat exchanger of the FCU. Further, a valve is provided in the cold / hot water supply passage to the coil, and an air conditioning control device is provided as a device for controlling the opening degree of the valve.

  The air conditioning control device opens the valve so that the deviation between the measured value of the indoor temperature of the air-conditioned area that receives the supply of conditioned air from the air conditioner and the set value of the indoor temperature set for this room temperature is zero. Control the degree. Thereby, the supply amount of cold / hot water to the coil of an air conditioner is controlled, and the temperature of the conditioned air from an air conditioner to an air-conditioning area is adjusted (for example, refer patent document 1).

  In the air conditioning control system described above, the setting of the room temperature of the control target space is generally left to the user or a building manager. For this reason, there is a risk that an excessive change in the indoor temperature setting that deviates from the design condition may occur as an operational error (operational fault). For example, in the case of cooling, the set value of the room temperature may be excessively lowered outside the design conditions. In this case, cold / hot water with a flow rate (overflow) greater than the design maximum flow rate passes through the heat exchanger of the air conditioner, the return water temperature returned to the heat source device cannot be maintained as designed, and the temperature difference of the return water is reduced. . As a result, COP (coefficient of performance: ratio of power consumption for generating cold / hot water to generated heat amount) is reduced, and energy consumption is increased.

  Further, as an operation fault, there is a case where the detection position of the temperature sensor that detects the room temperature is not appropriate, and a measurement value of the room temperature that correctly reflects the indoor load state cannot be obtained. Even in such a case, cold / hot water with a flow rate (overflow) higher than the air conditioning load may flow through the heat exchanger of the air conditioner, and the return water temperature returned to the heat source unit cannot be maintained as designed. There arises a problem that the temperature difference is reduced and energy consumption is increased.

  In view of this, the inventors have proposed an air conditioning control system that can suppress an excessive flow of cold / hot water to the heat exchanger of the air conditioner due to an operation fault (see Patent Document 2). The air conditioning control system calculates a first control output value that sets the deviation between the indoor temperature measurement value and the indoor temperature set value to zero, and sets the deviation between the return water temperature measured value and the return water temperature set value to zero. Calculating the second control output value to be compared, comparing the first control output value with the second control output value, and showing the smaller value as the opening / closing value of the cold / hot water valve among the two control output values Is selected as the actual control output value.

JP 2008-45855 A JP 2012-47412 A

The technique disclosed in Patent Document 2 is a technique that realizes energy saving by suppressing an excessive flow rate generated when the amount of heat to be processed in the control target space is large to an appropriate flow rate. In order to calculate the energy saving amount by this technique, it is necessary to calculate the flow rate Q of cold / hot water passing through the valve. The flow rate Q is calculated as follows.
Q = K × Cv × √ΔP (1)
K is a resistance coefficient, Cv is a capacity coefficient, and ΔP is a differential pressure across the valve.

  On the other hand, information obtained by the technique disclosed in Patent Document 2 is a control output value, and the control output value is a value indicating the valve opening. In order to convert the control output value to the flow rate Q, it is necessary to determine the front-rear differential pressure ΔP of the valve. However, in a system that does not include a measuring means for the front-rear differential pressure ΔP, the front-rear differential pressure ΔP cannot be determined Since the flow rate Q cannot be calculated, it is difficult to calculate the reduced amount of the flow rate Q, that is, the energy saving amount.

  The present invention has been made to solve the above-described problem, and an object thereof is to calculate an energy saving effect in an air conditioning control system that suppresses an excessive flow of cold / hot water to a heat exchanger of an air conditioner due to an operation fault. .

The air conditioning control system of the present invention includes an air conditioner that supplies conditioned air to a control target space, an indoor temperature sensor that measures the indoor temperature of the control target space, and a heat medium to the heat exchanger of the air conditioner. A valve provided in a supply passage, a return heat medium temperature sensor for measuring the temperature of the heat medium returned from the heat exchanger of the air conditioner, and an air conditioning control device for controlling the opening of the valve. The control device calculates a first control output value that makes a deviation between the measured indoor temperature value measured by the indoor temperature sensor and the indoor temperature set value set for the indoor temperature zero. A second value that sets a deviation between the return heat medium temperature measurement value measured by the output value calculation means and the return heat medium temperature sensor and the return heat medium temperature set value set for the return heat medium temperature to zero; Second control for calculating the control output value The force value calculation means, the first control output value and the second control output value are compared, and the one showing the smaller value as the valve opening value of the two control output values is actually controlled. A control output value selection means for selecting the output value and outputting the selected control output value to the valve; and when the control output value selection means selects the second control output value as an actual control output value. Only , energy saving amount calculating means for calculating an energy saving amount based on the first control output value and the second control output value is provided.
Moreover, in one structural example of the air-conditioning control system of this invention, when the said 1st control output value is said S1 and said 2nd control output value is said 1st control output value, the said energy saving amount calculating means will be {1- (S2 [ %] / S1 [%])} × 100 [%] to calculate the energy saving amount.

Further, the present invention provides an air conditioning control method for controlling an opening degree of a valve provided in a heat medium supply passage to a heat exchanger of an air conditioner that supplies conditioned air to the controlled space. An indoor temperature measuring step for measuring the indoor temperature of the air conditioner, a return heat medium temperature measuring step for measuring the temperature of the heat medium returned from the heat exchanger of the air conditioner with a return heat medium temperature sensor, and the indoor temperature A first control output value calculation step of calculating a first control output value in which a deviation between an indoor temperature measurement value measured by the sensor and an indoor temperature set value set for the indoor temperature is zero; A second control output value for calculating a second control output value with zero deviation between the return heat medium temperature measurement value measured by the return heat medium temperature sensor and the return heat medium temperature set value set for the return heat medium temperature is calculated. Control output value of 2 The step, the first control output value and the second control output value are compared, and the one showing the smaller value as the valve opening value of the two control output values is set as the actual control output value. The control output value selection step of selecting and outputting the selected control output value to the valve, and only when the second control output value is selected as the actual control output value in the control output value selection step. is characterized in that including the energy saving amount calculation step of calculating the energy savings amount based on said second control output to the first control output value.

  According to the present invention, by selecting one of the first control output value and the second control output value that shows a smaller value as the valve opening value as the actual control output value, It becomes possible to suppress the excessive flow rate of the heat medium to the heat exchanger. In the present invention, when the second control output value is selected as the actual control output value, the energy saving amount is calculated based on the first control output value and the second control output value. The amount of energy saving during opening degree control by the heat medium temperature can be easily calculated. As a result, in the present invention, the effect of opening degree control by the return heat medium temperature can be visualized.

It is a block diagram which shows the structure of the air-conditioning control system which concerns on embodiment of this invention. It is a block diagram which shows the structure of the air-conditioning control apparatus of the air-conditioning control system which concerns on embodiment of this invention. It is a flowchart explaining operation | movement of the air-conditioning control system which concerns on embodiment of this invention. It is a figure which shows the relationship between the 1st control output value at the time of air_conditionaing | cooling operation, a room temperature measured value, and a room temperature setting value. It is a figure which shows the relationship between the 2nd control output value at the time of air_conditionaing | cooling operation, a return heating medium temperature measurement value, and a return heating medium temperature setting value. It is a figure which shows the 2nd control output value by which the lower limit was controlled by the lower limit control part. It is a figure which shows the relationship between a fan output value and a 1st control output value.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an air conditioning control system according to an embodiment of the present invention. The air conditioning control system includes an air conditioner (FCU) 1 that controls the indoor temperature of the space 2 to be controlled, a valve 3 that controls the flow rate of the heat medium (cold water or hot water) supplied to the air conditioner 1, and the air conditioner 1. In the heat medium return pipe 4 for supplying the heat medium, the heat medium return pipe 5 through which the heat medium returned from the air conditioner 1 flows, the return heat medium temperature sensor 6 for measuring the temperature of the return heat medium, and the control target space 2 An indoor temperature sensor 7 provided and a remote control terminal 8 provided in the control target space 2 are provided.

  The air conditioner 1 includes a heat exchanger 10, a fan 11, and an air conditioning control device 12. The valve 3 is provided in a heat medium supply passage to the heat exchanger 10 of the air conditioner 1. In the present embodiment, the valve 3 is provided in the heat medium return pipe 5 through which the heat medium returned from the heat exchanger 10 flows.

  The heat exchanger 10 includes a single coil type and a double coil type. The single coil type is equipped with one cold / hot water coil, which exchanges heat between cold water and air using cold water as a heat medium during cooling, and exchanges heat between warm water and air using hot water as a heat medium during heating. is there. The double coil type is equipped with a cold water coil and a hot water coil. During cooling, cold water is used as a heat medium, and the cold water coil exchanges heat between cold water and air. During heating, the hot water is used as a heat medium and hot water is used as a hot water coil. Heat exchange with air is performed. In addition, as another example of the double coil type, a cold water coil and a cold / hot water coil are provided. During heating, the hot / cold water coil performs heat exchange with the cold / hot water coil as in the single coil type. There is one that performs heat exchange between cold water and air using both the cold water coil and the cold / hot water coil only when the cold water coil performs heat exchange between the cold water and air and the capacity of the cold water coil is insufficient. In the present embodiment, it is assumed that the heat exchanger 10 is a single coil type.

The heat medium to which the amount of heat is added by a heat source device (not shown) is pumped by a pump (not shown), is sent to the air conditioner 1 through the heat medium forward pipe 4, passes through the heat exchanger 10 and the valve 3, and is returned to the heat medium. 5 to return to the heat source machine. Thus, the heat medium circulates through the above path.
The air conditioner 1 cools or heats a mixture of air (return air) returning from the control target space 2 to the air conditioner 1 and the outside air by the heat exchanger 10, and the cooled or heated supply air is controlled by the fan 11. Send it to space 2.

  The control target space 2 is provided with an indoor temperature sensor 7 that measures the indoor temperature of the control target space 2 and a remote control terminal 8 that is operated by a resident of the control target space 2. In the heat medium return pipe 5, a return heat medium temperature sensor 6 for measuring the temperature of the return heat medium flowing through the heat medium return pipe 5 is provided in the vicinity of the outlet of the heat exchanger 10.

  The room temperature measurement value tpv measured by the room temperature sensor 7 is sent to the air conditioning control device 12 of the air conditioner 1. The remote control terminal 8 sends on / off information for instructing on / off of air conditioning, the indoor temperature set value tsp set by the resident, and the air volume information set by the resident to the air conditioning control device 12. It is done. Instead of the remote control terminal 8, on / off information, room temperature set value tsp, and air volume information may be given from the central management center 13. Further, the return heat medium temperature measurement value trpv measured by the return heat medium temperature sensor 6 is sent to the air conditioning control device 12.

  FIG. 2 shows the configuration of the air conditioning control device 12. The air conditioning control device 12 includes a first control output value calculation unit 120, a second control output value calculation unit 121, a lower limit regulation unit 122, a control output value selection unit 123, and a fan output value determination unit 124. And an energy saving amount calculation unit 125. The air conditioning control device 12 and the central management center 13 are connected via a network.

Next, the operation of the air conditioning control system of the present embodiment will be described. FIG. 3 is a flowchart for explaining the operation of the air conditioning control system.
The first control output value calculation unit 120 of the air conditioning control device 12 inputs the room temperature measurement value tpv measured by the room temperature sensor 7 and the room temperature set value tsp set by the remote control terminal 8 or the central management center 13. Then, a first control output value S1 that makes the deviation between the measured indoor temperature value tpv and the indoor temperature set value tsp zero is calculated by PID calculation (step S1 in FIG. 3).

  FIG. 4 shows the relationship among the first control output value (PID output) S1, the measured indoor temperature value tpv, and the indoor temperature set value tsp during the cooling operation. In FIG. 4, the vertical axis represents the first control output value S1, and the horizontal axis represents the indoor temperature measurement value tpv. A point indicated by a black triangle on the horizontal axis indicates a set point of the indoor temperature set value tsp.

  As shown in FIG. 4, during the cooling operation, the first control output value S1 shows a larger value as the opening value of the valve 3 as the value becomes larger. In this example, the 0% value of the first control output value S1 corresponds to the opening value 0% (fully closed) of the valve 3, and the 100% value of the first control output value S1 is the opening value of the valve 3. Corresponds to 100% (fully open).

  The second control output value calculation unit 121 of the air conditioning controller 12 receives the return heat medium temperature measurement value trpv measured by the return heat medium temperature sensor 6 and the preset return heat medium temperature set value trsp, A second control output value S2 in which the deviation between the return heat medium temperature measurement value trpv and the return heat medium temperature set value trsp is zero is calculated by PID calculation (step S2 in FIG. 3).

  FIG. 5 shows the relationship between the second control output value (PID output) S2 during the cooling operation, the return heat medium temperature measurement value trpv, and the return heat medium temperature set value trsp. In FIG. 5, the vertical axis indicates the second control output value S2, and the horizontal axis indicates the return heat medium temperature measurement value trpv. A point indicated by a black triangle on the horizontal axis indicates a set point of the return heat medium temperature set value trsp.

  As shown in FIG. 5, during the cooling operation, the second control output value S2 indicates a larger value as the opening value of the valve 3 as the value increases. In this example, the 0% value of the second control output value S2 corresponds to the opening value 0% (fully closed) of the valve 3, and the 100% value of the second control output value S2 is the opening value of the valve 3. Corresponds to 100% (fully open).

The lower limit value restricting unit 122 of the air conditioning control device 12 receives the second control output value S2 calculated by the second control output value calculating unit 121 as an input, and determines a lower limit value of the second control output value S2 in advance. The minimum value L _MIN is regulated (step S3 in FIG. 3). That is, as shown in FIG. 6, the lower limit regulating unit 122 regulates the lower limit value of the second control output value S2 sent from the second control output value calculating unit 121 with the minimum value L _MIN and The subsequent second control output value S2 ′ is prevented from falling below the minimum value _LMIN .

For this reason, the second control output value S2 ′ input to the control output value selection unit 123 of the air conditioning control device 12 does not fall below the minimum value L _MIN during the opening degree control by the return heat medium temperature described later, and the valve A minimum opening of 3 is ensured. Thereby, while the opening degree control by the return heat medium temperature is regulated by the lower limit value, the supply of the conditioned air from the air conditioner 1 to the controlled space 2 is continued, and the extreme deterioration of the indoor environment is prevented. It will be.
The lower limit value restricting unit 122 is not an essential component of the present invention, and may be sent to the control output value selecting unit 123 without restricting the lower limit value of the second control output value S2.

  Next, the control output value selection unit 123 of the air-conditioning control device 12 includes the first control output value S1 output from the first control output value calculation unit 120 and the second control output from the lower limit value regulating unit 122. The output value S2 ′ is input, and the lower one of the two control output values S1 and S2 ′ is selected as the actual control output value S with respect to the opening of the valve 3, and this control output value S is selected as the valve 3 (Step S4 in FIG. 3). That is, the actual control output value S is selected to indicate a smaller value as the opening value of the valve 3. If the first control output value S1 matches the second control output value S2 ', the first control output value S1 may be selected. Thus, the valve 3 is controlled to have an opening corresponding to the control output value S.

  In the case where the lower limit regulating unit 122 is not provided, the control output value selecting unit 123 selects the smaller one of the first control output value S1 and the second control output value S2 as the opening value of the valve 3. The actual control output value S may be selected.

  Subsequently, the fan output value determination unit 124 of the air conditioning control device 12 determines the fan output value F based on the first control output value S1 output from the first control output value calculation unit 120, and this fan output The value F is output to the fan 11 (step S5 in FIG. 4). Thus, the air volume of the fan 11 is set to a value corresponding to the fan output value F.

  FIG. 7 shows the relationship between the fan output value F and the first control output value S1. In FIG. 7, the vertical axis indicates the fan output value F, and the horizontal axis indicates the first control output value S1. When the first control output value S1 is equal to or greater than FLP, the fan output value F transitions from OFF (air volume 0) to L (small air volume), and when the first control output value S1 is equal to or greater than FMP, The fan output value F transits from L to M (medium air volume), and when the first control output value S1 becomes equal to or higher than FHP, the fan output value F transits from M to H (air volume is large). When the first control output value S1 is equal to or lower than FHY (FHY <FHP), the fan output value F transits from H to M, and the first control output value S1 is equal to or lower than FMY (FMY <FMP). In this case, the fan output value F transits from M to L, and when the first control output value S1 is equal to or less than FLY (FLY <FLP), the fan output value F transits from L to OFF.

  The above-described operation of the fan output value determination unit 124 is performed when the air volume is automatically controlled. However, during manual air volume control, the fan output value determination unit 124 executes the determination process as described with reference to FIG. Instead, the fan output value F is determined according to the air volume setting value fsp set from the remote control terminal 12 or the central management center 13. The air volume setting value fsp indicates one of OFF, L, M, and H values.

Next, when the control output value selection unit 123 selects the second control output value S2 ′ as the actual control output value S (YES in step S6 in FIG. 3), the energy saving amount calculation unit 125 of the air conditioning control device 12 An energy saving amount is calculated from the first control output value S1 and the second control output value S2 ′ (step S7). Specifically, the energy saving amount calculation unit 125 calculates the energy saving amount ΔE by Expression (2).
ΔE = {1− (S2 ′ [%] / S1 [%])} × 100 [%] (2)

For example, when the first control output value S1 is 100% and the second control output value S2 ′ is 60%, the energy saving amount ΔE is {1− (60/100)} × 100 = 40%.
In the case where the lower limit regulating unit 122 is not provided, the energy saving amount ΔE is calculated by the following equation (3).
ΔE = {1− (S2 [%] / S1 [%])} × 100 [%] (3)

The energy saving amount calculation unit 125 sends the calculated value of the energy saving amount ΔE to the central management center 13 to display the value of the energy saving amount ΔE on the display device (not shown) of the central management center 13 (step S8 in FIG. 3). The output method of the energy saving amount ΔE is not limited to this, and it goes without saying that other output methods such as audio output may be used.
The air conditioning control device 12 repeatedly executes the operations in steps S1 to S8 at regular intervals until the control ends (YES in step S9 in FIG. 3).

[When deviation between return heat medium temperature measurement value and return heat medium temperature setting value is small]
Next, a specific example of the operation of the air conditioning control system of the present embodiment will be described. Now, it is assumed that the cooling operation is being performed and the deviation between the return heat medium temperature measurement value trpv and the return heat medium temperature set value trsp is small as the current control state. In this case, the 2nd control output value calculating part 121 of the air-conditioning control apparatus 12 outputs 2nd control output value S2 near 100% value (refer FIG. 5). The second control output value S2 is given to the control output value selection unit 123 as the second control output value S2 ′ via the lower limit regulation unit 122.

  The control output value selection unit 123 of the air conditioning control device 12 includes a first control output value S1 output from the first control output value calculation unit 120 and a second control output value S2 output from the lower limit value regulating unit 122. And the first control output value S1 is selected as the actual control output value S. As a result, the first control output value S1 is sent to the valve 3 as the actual control output value S, and the opening degree control of the valve 3 (indoors) is made such that the deviation between the measured indoor temperature value tpv and the indoor temperature set value tsp is zero. Opening control by temperature) is performed. Since the energy saving effect cannot be obtained by the opening degree control based on the room temperature, the processes in steps S7 and S8 are not executed.

[When excessive room temperature setting changes that deviate from design conditions]
Next, an operation when an excessive room temperature setting change that deviates from the design condition is performed as an operation fault will be described. In other words, it is assumed that the room temperature set value tsp is excessively lowered by the resident or the building manager in the cooling operation and deviates from the design condition.

  In this case, since the deviation between the indoor temperature measurement value tpv and the indoor temperature set value tsp is large, the first control output value S1 calculated by the first control output value calculation unit 120 of the air conditioning control device 12 is large. (See FIG. 4). For this reason, the opening degree of the valve 3 is greatly widened, and the heat medium (here, cold water) passing through the heat exchanger 10 of the air conditioner 1 has an excessive flow rate. When the heat medium passing through the heat exchanger 10 has an excessive flow rate, the return heat medium temperature measurement value trpv decreases, and the deviation between the return heat medium temperature measurement value trpv and the return heat medium temperature set value trsp increases, and the air conditioning control device The second control output value S2 calculated by the 12 second control output value calculation units 121 becomes smaller (see FIG. 5).

  Then, the control output value selection unit 123 of the air conditioning control device 12 compares the first control output value S1 and the second control output value S2 ′ to obtain the second control output value S2 ′ as the actual control output value. S is selected. As a result, the second control output value S2 ′ is sent to the valve 3 as the actual control output value S, and the deviation between the return heat medium temperature measurement value trpv and the return heat medium temperature set value trsp is set to zero. Opening control of the valve 3 (opening control based on the return heat medium temperature (return temperature compensation control)) is started. That is, the opening degree control by the room temperature is interrupted, and the opening degree control by the return heat medium temperature is switched.

In the opening degree control based on the return heat medium temperature, since the opening degree of the valve 3 is reduced, the flow rate of the cold water passing through the heat exchanger 10 of the air conditioner 1 is reduced. In this manner, in this embodiment, when an excessive room temperature setting change that deviates from the design condition is performed as an operation fault, the excessive flow rate of the heat medium to the heat exchanger 10 of the air conditioner 1 is suppressed. Will come to be.
In the opening degree control based on the return heat medium temperature, the energy saving amount ΔE is calculated and displayed as described above.

[When the detection position of the temperature sensor that detects the room temperature is not appropriate]
Next, as an operation fault, it is assumed that the detection position of the indoor temperature sensor 7 is not appropriate, and a state in which the indoor temperature measurement value tpv that correctly reflects the indoor load state cannot be obtained occurs. For example, it is assumed that the detection position of the indoor temperature sensor 7 is bad and the indoor temperature measurement value tpv is obtained as a higher value than the actual value. In this case, the first control output value S1 determined by the first control output value calculation unit 120 of the air conditioning control device 12 is increased, the opening of the valve 3 is greatly widened, and the heat exchanger 10 of the air conditioner 1 is increased. The heat medium (cold water) passing through may become an excessive flow rate.

  The operation when the heat medium passing through the heat exchanger 10 becomes an excessive flow rate is as described above. Also in this case, it goes without saying that the energy saving amount ΔE is calculated and displayed. In this way, in the present embodiment, as an operation fault, the detection position of the indoor temperature sensor 7 is not appropriate, and a state in which the indoor temperature measurement value tpv that correctly reflects the indoor load state cannot be obtained occurs. Even in such a case, the excessive flow rate of the heat medium to the heat exchanger 10 of the air conditioner 1 is suppressed.

  It is difficult to directly determine the flow rate reduction amount ΔQ of the valve 3 when the control output value selection unit 123 selects the second control output value S2 ′ as the actual control output value S. However, in this embodiment, since the first control output value S1 and the second control output value S2 ′ are held as information, the opening degree control by the return heat medium temperature is performed using this information. The energy saving amount ΔE of can be easily calculated. As a result, in the present embodiment, it is possible to visualize the effect of opening degree control by the return heat medium temperature.

In the present embodiment, the lower limit value regulating unit 122 regulates the lower limit value of the second control output value S2. However, the second control output by itself to the second control output value computing unit 121. A function of restricting the lower limit value of the output value S2 may be added.
In the present embodiment, the indoor temperature sensor 7 is provided in the control target space 2 to measure the indoor temperature of the control target space 2, but the return air returned from the control target space 2 to the air conditioner 1 is measured. You may make it measure temperature as room temperature.

In the present embodiment, the valve 3 and the return heat medium temperature sensor 6 are provided separately, but the return heat medium temperature sensor 6 may be provided integrally with the valve 3. Further, the valve 3 may be provided not on the heat medium return pipe 5 but on the heat medium forward pipe 4 near the inlet of the heat exchanger 10.
Moreover, in this Embodiment, although the heat exchanger 10 of the air conditioner 1 is made into the single coil type, you may apply this invention to a double coil type heat exchanger.

  The air conditioning control device 12 described in the present embodiment can be realized by a computer including a CPU, a storage device, and an interface, and a program that controls these hardware resources. The CPU executes the processing described in the present embodiment in accordance with a program stored in the storage device.

  The present invention can be applied to an air conditioning control system that controls the opening degree of a valve provided in a heat medium supply passage to a heat exchanger of an air conditioner.

  DESCRIPTION OF SYMBOLS 1 ... Air conditioner, 2 ... Control object space, 3 ... Valve, 4 ... Heat medium return piping, 5 ... Heat medium return piping, 6 ... Return heat medium temperature sensor, 7 ... Indoor temperature sensor, 8 ... Remote control terminal, 10 ... Heat exchanger, 11 ... fan, 12 ... air conditioning controller, 13 ... central management center, 120 ... first control output value calculator, 121 ... second control output value calculator, 122 ... lower limit regulator, 123 ... control output value selection unit, 124 ... fan output value determination unit, 125 ... energy saving amount calculation unit.

Claims (4)

An air conditioner that supplies conditioned air to the controlled space;
An indoor temperature sensor for measuring the indoor temperature of the control target space;
A valve provided in the supply passage of the heat medium to the heat exchanger of the air conditioner;
A return heat medium temperature sensor for measuring the temperature of the heat medium returned from the heat exchanger of the air conditioner;
An air conditioning control device for controlling the opening of the valve,
The air conditioning control device
First control output value calculating means for calculating a first control output value that makes a deviation between the measured indoor temperature value measured by the indoor temperature sensor and the indoor temperature set value set for the indoor temperature zero. When,
A second control output value is calculated in which the deviation between the return heat medium temperature measurement value measured by the return heat medium temperature sensor and the return heat medium temperature set value set for the return heat medium temperature is zero. Second control output value calculation means;
The first control output value and the second control output value are compared, and a value indicating a smaller value as the valve opening value of the two control output values is selected as an actual control output value, Control output value selection means for outputting the selected control output value to the valve;
Only when the control output value selection means selects the second control output value as the actual control output value, the energy saving amount is calculated based on the first control output value and the second control output value. An air-conditioning control system comprising: an energy-saving amount calculating means for performing. The air conditioning control system according to claim 1, wherein
When the first control output value is S1 and the second control output value is S2, the energy saving amount calculation means is {1- (S2 [%] / S1 [%])} × 100 [%]. The air conditioning control system characterized in that the energy saving amount is calculated by the above. In an air conditioning control method for controlling the opening of a valve provided in a heat medium supply passage to a heat exchanger of an air conditioner that supplies conditioned air to a control target space,
An indoor temperature measuring step of measuring the indoor temperature of the control target space with an indoor temperature sensor;
A return heat medium temperature measuring step for measuring the temperature of the heat medium returned from the heat exchanger of the air conditioner with a return heat medium temperature sensor;
A first control output value calculation step for calculating a first control output value in which the deviation between the measured indoor temperature value measured by the indoor temperature sensor and the indoor temperature set value set for the indoor temperature is zero. When,
A second control output value is calculated in which the deviation between the return heat medium temperature measurement value measured by the return heat medium temperature sensor and the return heat medium temperature set value set for the return heat medium temperature is zero. A second control output value calculation step;
The first control output value and the second control output value are compared, and a value indicating a smaller value as the valve opening value of the two control output values is selected as an actual control output value, A control output value selection step of outputting the selected control output value to the valve;
Only when the second control output value is selected as the actual control output value in this control output value selection step, the energy saving amount is calculated based on the first control output value and the second control output value. An air conditioning control method comprising: an energy saving amount calculating step. In the air-conditioning control method according to claim 3,
In the energy saving amount calculating step, assuming that the first control output value is S1 and the second control output value is S2, {1- (S2 [%] / S1 [%])} × 100 [%] The air conditioning control method characterized in that the energy saving amount is calculated by:

Images