Air conditioning control device and program

Abstract

To suppress the occurrence of cold draft during cooling.SOLUTION: An air conditioning control device 50 includes an acquiring part t1 for acquiring a temperature t of conditioned air as a blowout temperature 51A, and acquiring a temperature of an air conditioning object space as a space temperature TR. The air-conditioning control device 50 includes a feedback control part t1 for feedback-controlling the air conditioner based on the target temperature Tt and the blowout temperature 51B, and a temperature control part Th1 for controlling the target temperature Tt so that a temperature difference between the temperature of the air-conditioned space and the temperature t of the air-conditioned air does not exceed a predetermined value 51C based on the space temperature.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an air conditioning control device and a program. [Background technology]

[0002] Patent Document 1 discloses an air conditioning control device that controls the cooling capacity of an air conditioner based on the type of air volume of conditioned air and the air conditioning state (total control status) of the space to be air-conditioned. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 8-28940 Summary of the Invention [Problem to be solved by the invention]

[0004] The air conditioning control device described in Patent Document 1 has room for improvement from the viewpoint of energy conservation.

[0005] An object of the present invention is to improve the energy saving effect. [Means for solving the problem]

[0006] The air conditioning control device of the present invention comprises an acquisition unit that acquires the temperature of the conditioned air that an air conditioner blows to a space to be air-conditioned, the air conditioning state of the space to be air-conditioned, and the operating mode of the air conditioner; a feedback control unit that feedback controls the air conditioner based on the target temperature and the temperature of the conditioned air; and a temperature control unit that controls the target temperature in accordance with the operating mode when the air conditioning state is a first state in which the air volume of the conditioned air can be reduced by lowering the target temperature, the operating modes including a cooling mode and an outdoor air cooling mode, and the temperature control unit lowers the target temperature when the air conditioning state is in the first state and the operating mode is the cooling mode, and maintains or raises the target temperature when the air conditioning state is in the first state and the operating mode is the outdoor air cooling mode.

[0007] The program according to the present invention causes a computer to function as the air conditioning control device. [Effects of the Invention]

[0008] According to the present invention, the energy saving effect is enhanced. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a configuration diagram of an air conditioning system equipped with an air conditioning control device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a diagram showing the configuration of the air conditioning control device. [Figure 3] FIG. 3 is a flowchart of the target temperature control process. DETAILED DESCRIPTION OF THE INVENTION

[0010] An air conditioning control device according to an embodiment of the present invention will be described below with reference to the drawings.

[0011] 1, an air conditioning control device 50 according to an embodiment of the present invention is configured as part of an air conditioning system 10. In addition to the air conditioning control device 50, the air conditioning system 10 also includes an air conditioner 20, VAV (Variable Air Volume) units 30-1 to 30-N, and VAV controllers 40-1 to 40-N. The air conditioning system 10 also includes dampers DP1 to DP3, temperature sensors T1 and T2, a humidity sensor H1, and the like.

[0012] The air conditioner 20 includes a chilled water valve 21, a cooling coil 22, a hot water valve 23, a heating coil 24, and a blower 25. The chilled water valve 21, for example, is an electrically operated valve and controls the flow rate of chilled water flowing through the cooling coil 22. The hot water valve 23, for example, is an electrically operated valve and controls the flow rate of hot water flowing through the heating coil 24. The blower 25 blows the air cooled by the cooling coil 22 during cooling or heated by the heating coil 24 during heating as conditioned air into an air supply duct D1 located above the ceiling of the building. Note that air before being cooled by the cooling coil 22 or heated by the heating coil 24, i.e., before being treated as conditioned air, is also referred to as pre-conditioning air. The air conditioner 20 adjusts the temperature of the conditioned air by adjusting the opening degree of the chilled water valve 21 (i.e., the flow rate of chilled water) and the opening degree of the hot water valve 23 (i.e., the flow rate of hot water). The air conditioner 20 may have any configuration as long as it has the functions of cooling and heating the air before conditioning and of blowing the conditioned air. The air conditioning system 10 also has heat source equipment (not shown) that produces chilled water and hot water.

[0013] VAV units 30-1 to 30-N and VAV controllers 40-1 to 40-N are provided corresponding to rooms 90-1 to 90-N, which constitute the spaces to be air-conditioned in the building. Each of rooms 90-1 to 90-N is provided with blowout units 91-1 to 91-N, temperature sensors 92-1 to 92-N, and operation panels 93-1 to 93-N. In this embodiment, N is an integer of 2 or greater, but may also be 1. Elements with the same N and a corresponding reference number correspond to each other. For example, VAV unit 30-1 and VAV controller 40-1 are provided corresponding to room 90-1, and room 90-1 is provided with blowout unit 91-1, temperature sensor 92-1, and operation panel 93-1.

[0014] In the following description, the VAV units 30-1 to 30-N, VAV controllers 40-1 to 40-N, rooms 90-1 to 90-N, blow-out sections 91-1 to 91-N, temperature sensors 92-1 to 92-N, and operation panels 93-1 to 93-N will also be collectively referred to as VAV unit 30, VAV controller 40, room 90, blow-out section 91, temperature sensor 92, and operation panel 93, respectively.

[0015] One end of the VAV unit 30 is connected to an air supply duct D1, and the other end is connected to an air outlet 91 arranged in an upper portion of the room, such as the ceiling, of the room 90 corresponding to the VAV unit 30. The VAV unit 30 supplies conditioned air supplied from the air conditioner 20 via the air supply duct D1 to the air outlet 91. The air outlet 91 blows the supplied conditioned air into the room 90. The VAV unit 30 includes a damper and the like to adjust the volume of the conditioned air blown out from the air outlet 91 into the room 90. The VAV unit 30 is controlled by a VAV controller 40. Because the air outlet 91 is provided in the upper portion of the room, the air conditioning system 10 is a top-blow type air conditioning system that blows out conditioned air from the upper portion of the room. The upper portion of the room includes not only the ceiling but also the upper portion of the wall (for example, a portion at a height of 2 m or more from the floor).

[0016] The VAV controller 40 is configured to include a computer, etc. The VAV controller 40 acquires the temperature of the room 90 detected by a temperature sensor 92 of the room 90 corresponding to the VAV controller 40 as the room temperature Tr. Note that multiple temperature sensors 92 may be provided per room 90, and in such a case, the VAV controller 40 may acquire the average, representative, minimum, or maximum value of the temperatures detected by each temperature sensor 92 as the room temperature Tr. The VAV controller 40 also receives as input the set temperature SP of the room 90 input by the user of the room 90 via the operation panel 93. The VAV controller 40 also has a function of communicating with the air conditioning control device 50.

[0017] VAV controller 40 calculates a required airflow rate Rf of the conditioned air to be supplied to room 90 based on the deviation between room temperature Tr from temperature sensor 92 and set temperature SP from operation panel 93. VAV controller 40 supplies the calculated required airflow rate Rf to air conditioning control device 50. Furthermore, VAV controller 40 controls VAV unit 30 (damper opening) to ensure the calculated required airflow rate Rf. This control is, for example, feedback control in which the current airflow detected by an air speed sensor (not shown) provided in VAV unit 30 is used as a feedback value. In this feedback control, in addition to the detected value of the air speed sensor, the detected value of a damper opening sensor provided in VAV unit 30 may also be used.

[0018] The VAV controller 40 further determines the air conditioning state (also called control status) of the room 90 from the current required airflow Rf, the room temperature Tr from the temperature sensor 92, and the set temperature SP from the operation panel 93, and supplies the determined air conditioning state to the air conditioning control device 50. The determination and supply of the air conditioning state are performed periodically at a predetermined cycle.

[0019] For example, the technology described in Patent Document 1 can be used to identify the air conditioning state by the VAV controller 40. Some of such operations will be exemplified below. (1) If the current room temperature Tr is higher than the set temperature SP (e.g., the cooling set temperature) by a predetermined difference or more and the current requested airflow Rf is at its maximum, the VAV controller 40 determines that the current state is one in which the cooling capacity should be increased and supplies the air conditioning control device 50 with an air conditioning state of “requesting increased cooling capacity.” (2) When the first condition is met that the current room temperature Tr is the same as the set temperature SP (e.g., the air conditioning set temperature) or the difference between the two is less than the predetermined difference, and the current required air volume Rf is greater than the predetermined air volume, the VAV controller 40 determines that the current state is a state in which the required air volume Rf can be lowered by lowering the temperature t of the conditioned air (the blower temperature t1 described below), and supplies the air conditioning state of “Cooling (blower temperature changeable)” to the air conditioning control device 50. (3) When the second condition is met, that is, when the current room temperature Tr is the same as the set temperature SP (e.g., the cooling set temperature) or the difference between the two is less than the predetermined difference, and when the current requested airflow Rf is lower than the predetermined airflow, the VAV controller 40 determines that the current state is a state that the user is satisfied with, and supplies the air conditioning state of “Cooling (Satisfied)” to the air conditioning control device 50.

[0020] In addition to the above, the air conditioning status includes "intermediate season," "heating (satisfactory)," "heating (air temperature changeable)," and "request for increased heating capacity." Since known technology can be applied to these, a description thereof will be omitted.

[0021] The conditioned air supplied to the room 90 contributes to the air conditioning of the room 90. The conditioned air in the room 90 flows through a return air duct D2 from an exhaust port (not shown). In this way, the air exhausted from each of the rooms 90-1 to 90-N flows into the return air duct D2. A portion of the air flowing through the return air duct D2 is discharged to the outside of the building via an exhaust adjustment damper DP1, and the remaining portion is returned to the air conditioner 20 as return air via a return air adjustment damper DP2. Furthermore, with respect to the return air returned to the air conditioner 20, outside air from outside the building is taken in at a predetermined ratio via an outside air adjustment damper DP3, and a mixture of the return air and outside air is supplied to the air conditioner 20 as pre-conditioning air. The opening degrees of the dampers DP1 to DP3 are controlled by the air conditioning control device 50.

[0022] The temperature sensor T1 detects the temperature of the conditioned air from the air conditioner 20, in other words, the temperature of the conditioned air blown out from the blowout section 91 and supplied to the room 90. The temperature sensor T2 detects the temperature of the outside air supplied to the air conditioner 20 via the damper DP3. The temperature sensors T1 and T2 each supply the detected values ​​to the air conditioning control device 50. The humidity sensor H1 detects the humidity of the return air, which is the air flowing through the return air duct D2, and supplies the detected humidity to the air conditioning control device 50.

[0023] The air conditioning control device 50 is configured to control the air conditioning system 10, particularly the chilled water valve 21, hot water valve 23, and blower 25 of the air conditioner 20, based on various information such as information from the VAV controller 40 and the temperatures detected by the temperature sensors T1 and T2, and to control the temperature and air volume of the conditioned air from the air conditioner 20. Note that in the air conditioning system 10, there are multiple combinations of temperature and air volume that can produce the same cooling effect. In other words, when there is a temperature and air volume that can produce a certain cooling effect, approximately the same cooling effect can be obtained by lowering the temperature and increasing the air volume accordingly, or by raising the temperature and decreasing the air volume accordingly.

[0024] The air conditioning control device 50 is configured with a computer, etc. The air conditioning control device 50 includes a processor 51 such as a CPU, non-volatile storage 52 that stores programs P and data executed or used by the processor 51, and RAM 53 that functions as the main memory of the processor 51.

[0025] The processor 51 executes the programs stored in the storage 52 to operate as an information acquisition unit 51A, a feedback control unit 51B, an operation mode identification unit 51C, and a temperature control unit 51D shown in FIG.

[0026] The information acquisition unit 51A acquires the temperatures from the temperature sensors T1 and T2 as the blower temperature t1 and the outside air temperature t2, and also acquires the air conditioning state and room temperature Tr of each of the rooms 90-1 to 90-N from each of the VAV controllers 40-1 to 40-N. The information acquisition unit 51A acquires the humidity from the humidity sensor H1 as the return air humidity h1.

[0027] Based on the acquired room temperatures Tr, the information acquisition unit 51A acquires the temperature of all of the rooms 90-1 to 90-N, i.e., the temperature of the spaces to be air-conditioned, as the space temperature TR. The space temperature TR may be the average value, representative value, minimum value, or maximum value of each room temperature Tr. The representative value may be the room temperature Tr of a room 90 selected randomly or in any order. The space temperature TR may be acquired periodically, and the room 90 serving as the representative value may be changed each time the space temperature TR is acquired.

[0028] The information acquisition unit 51A acquires a total control status, which is the air conditioning status of the entire air conditioned space, based on the air conditioning status of each of the rooms 90-1 to 90-N acquired as described above. The conditions of the total control status are shown below as examples. [Table 1]

[0029] In the above table, "Cooling (Full)" and "Warming (Full)" indicate "Cooling (Satisfied)" and "Heating (Satisfied)", respectively. "Cooling (Supply)" and "Warming (Supply)" indicate "Cooling (Air Supply Temperature Changeable)" and "Heating (Air Supply Temperature Changeable)", respectively. Furthermore, "◯" in the table indicates that the air conditioning state must be included in each air conditioning state of rooms 90-1 to 90-N when determining the corresponding total control status, "×" in the table indicates that the air conditioning state must not be included in each air conditioning state when determining the corresponding total control status, and "~" indicates that the air conditioning state may or may not be included in each air conditioning state when determining the corresponding total control status.

[0030] For example, if the air conditioning status does not include "Heating (satisfactory)" / "Heating (air supply temperature changeable)" or "Heating capacity increase request," but does include at least one "Cooling capacity increase request," the information acquisition unit 51A acquires "Cooling capacity increase request" as the total control status (Case No. 1). "Cooling capacity increase request" is the total control status when the desired cooling effect cannot be obtained unless the target temperature Tt is lowered, in other words, by increasing the airflow rate of the conditioned air.

[0031] When each air conditioning state includes only "Cooling (air flow temperature changeable)" (when there is no "Cooling (Satisfied)"), the information acquisition unit 51A acquires "Cooling (air flow temperature changeable)" as the total control status (Case No. 3), and when each air conditioning state includes only "Cooling (air flow temperature changeable)" and "Cooling (Satisfied)" or all "Cooling (Satisfied)", the information acquisition unit 51A acquires "Cooling (Satisfied)" as the total control status (Case No. 3). "Cooling (air flow temperature changeable)" is a total control status that can reduce the air volume of conditioned air by lowering the target temperature Tt. Note that when each air conditioning state includes only "Cooling (air flow temperature changeable)" and "Cooling (Satisfied)", that is, when at least one "Cooling (air flow temperature changeable)" is included and the rest are "Cooling (Satisfied)", the status may be set to "Cooling (air flow temperature changeable)".

[0032] The feedback control unit 51B calculates the temperature t1 of the airflow acquired by the information acquisition unit 51A, The air conditioner 20 is controlled based on the outside air temperature t2 and the return air humidity h1. In particular, the feedback control unit 51B feedback controls the air conditioner 20 so that the blower temperature t1 of the conditioned air follows the target temperature Tt. The target temperature Tt changes depending on the air conditioning state of the air conditioned space acquired by the information acquisition unit 51A (i.e., the total control status).

[0033] (A) When the blower temperature t1 exceeds the target temperature Tt, the feedback control unit 51B increases or decreases the cooling control output so that the blower temperature t1 coincides with the target temperature Tt. The feedback control unit 51B opens or closes the chilled water valve 21 at an opening degree that corresponds to the magnitude of the cooling control output. As a result, chilled water flows through the cooling coil 22, and conditioned air cooled by the cooling coil 22 is supplied from the air conditioner 20.

[0034] (B) When the supply air temperature t1 exceeds the target temperature Tt and the outdoor air temperature t2 is lower than the supply air temperature t1 or the target temperature Tt, that is, when cooling can be achieved by taking in outdoor air, the feedback control unit 51B increases or decreases the outdoor air cooling control output so that the supply air temperature t1 matches the target temperature Tt. The feedback control unit 51B opens the dampers DP1 and DP3 at an opening degree corresponding to the outdoor air cooling control output and closes the damper DP2. If the supply air temperature t1 does not match the target temperature Tt even after the damper DP3 has been opened to a predetermined opening degree, the feedback control unit 51B increases or decreases the cooling control output so that the supply air temperature t1 matches the target temperature Tt, and opens or closes the chilled water valve 21 at an opening degree corresponding to the magnitude of the cooling control output.

[0035] (C) When the blowing air temperature t1 falls below the target temperature Tt, the feedback control unit 51B increases or decreases the heating control output so that the blowing air temperature t1 coincides with the target temperature Tt. The feedback control unit 51B opens or closes the hot water valve 23 at an opening degree according to the magnitude of the heating control output. As a result, hot water flows through the heating coil 24, and conditioned air heated by the heating coil 24 is supplied from the air conditioner 20.

[0036] (D) When the return air humidity h1 exceeds a preset humidity setting, the feedback control unit 51B increases (or decreases) the dehumidification control output so that the return air humidity falls below (or matches) the set humidity. At this time, the feedback control unit 51B compares the dehumidification control output with the cooling control output, and opens and closes the chilled water valve 21 at an opening degree corresponding to the larger output. If the dehumidification control output is greater than the cooling control output, the chilled water valve 21 opens and closes in dehumidification control. When the supply air temperature t1 falls below the target temperature Tt, the feedback control unit 51B also opens and closes the hot water valve 23 for dehumidification reheat operation. In the dehumidification reheat state, the chilled water valves 21 and 23 open simultaneously, and chilled water and hot water flow simultaneously, resulting in a significant increase in the energy consumption of the air conditioner.

[0037] The operation mode determination unit 51C monitors the cooling control output, heating control output, outdoor air cooling control output, dehumidification control output, blower temperature t1, space temperature TR, and a total control status (described later), and determines the operation mode of the air conditioner 20. Examples of the operation modes of the air conditioner 20 and the conditions for determining those operation modes are shown in the table below. [Table 2]

[0038] The operation mode identification unit 51C identifies the operation mode when each control output is (A) to (D) as the cooling mode, outdoor air cooling mode, heating mode, or dehumidification mode, respectively. The cooling mode is also called the non-outdoor air cooling mode because it is a cooling mode that does not use the cooling effect of outdoor air as much as the outdoor air cooling mode. The operation mode identification unit 51C identifies the operation mode as the stopped mode when the total control status (described later) is "stopped." When the difference between the space temperature TR and the blower temperature t1 reaches a predetermined threshold (approximately 10°C), the operation mode identification unit 51C identifies the operation mode as the low-temperature blower mode regardless of other conditions, because this mode is prone to cold drafts (cold air flow that descends at a speed faster than necessary) when the difference between the two becomes greater.

[0039] The temperature control unit 51D controls the target temperature Tt based on the air conditioning state (total control status) of the air-conditioned space acquired by the information acquisition unit 51A. Control of the target temperature Tt can also be said to control the temperature t of the conditioned air. If the total control status is "cooling capacity increase request," the temperature control unit 51D lowers the target temperature Tt by a predetermined temperature (e.g., 1.0°C). If the total control status is "heating capacity increase request," the temperature control unit 51D raises the target temperature Tt by a predetermined temperature (e.g., 1.0°C). If the total control status is "heating (air supply temperature changeable)," the temperature control unit 51D raises the target temperature Tt by a temperature lower than the predetermined temperature (e.g., 0.5°C). If the total control status is "cooling (air supply temperature changeable)," the temperature control unit 51D controls the target temperature Tt according to the operation mode of the air conditioner 20 (details will be described later). If the total control status is other than this, the temperature control unit 51D maintains the target temperature Tt. In this way, the target temperature Tt is controlled in accordance with the total control status, whereby the blown air temperature t1 is appropriately controlled.

[0040] The temperature control unit 51D, together with the operation mode specifying unit 51C, executes the target temperature control process shown in FIG.

[0041] The temperature control unit 51D identifies the current total control status acquired by the information acquisition unit 51A (step S101). Also, the operation mode identification unit 51C identifies the current operation mode based on various information such as the current cooling control output (step S101).

[0042] Thereafter, if the total control status is not "cooling (air blowing temperature changeable)" (step S102; No), temperature control unit 51D controls target temperature Tt as described above according to the current total control status (step S111).

[0043] If the total control status is "Cooling (blowout temperature changeable)" (Step S102; Yes) and the current operating mode is "Cooling mode" (non-outdoor air cooling mode) (Step S103; Yes), the temperature control unit 51D lowers the target temperature Tt (Step S104). Because the power of the blower 25 of the air conditioner 20 is proportional to the cube of the volume of conditioned air blown by the blower 25, an increase in the volume of conditioned air blown significantly increases the power of the blower 25. Therefore, for a given cooling capacity, although it depends on the coefficient of performance of the heat source system, including the chiller and pump that cool and deliver the chilled water flowing through the cooling coil 22, operating the heat source system generally reduces the overall energy consumption of the air conditioning system 10 rather than increasing the power of the blower 25. Therefore, by having the temperature control unit 51D lower the target temperature Tt by, for example, a predetermined temperature (e.g., 0.5°C), energy savings can be achieved. The reduction amount of the target temperature Tt (the above-mentioned predetermined temperature) is smaller than the reduction amount of the target temperature Tt when there is a "request to increase cooling capacity".

[0044] If the current operating mode is not the "cooling mode" (step S103; No) but the "outdoor air cooling mode" (step S105; Yes), the temperature control unit 51D maintains or increases the target temperature Tt (step S106). If the target temperature Tt is low during "outdoor air cooling," the outdoor air alone cannot provide cooling, making it more likely that the chilled water valve 21 will need to be opened to allow chilled water to flow through the cooling coil 22. This increases chilled water consumption, ultimately increasing the overall energy consumption of the air conditioning system 10. Therefore, here, the target temperature Tt is maintained or increased to reduce chilled water consumption and conserve energy. Note that whether to maintain or increase the target temperature Tt may be set arbitrarily. The target temperature Tt may be always maintained or always increased in the low-temperature air blowing mode. The temperature control unit 51D may increase the target temperature Tt when the difference between the outdoor air temperature t2 and the target temperature Tt is equal to or greater than a predetermined threshold, and may maintain the target temperature Tt when the difference is less than the threshold. The increase in the target temperature Tt may be a constant value, or may vary depending on the difference between the outside air temperature t2 and the target temperature Tt.

[0045] If the current operation mode is not the "outdoor air cooling mode" (step S105; No) but the "dehumidification mode" (step S107; Yes), the temperature control unit 51D lowers the target temperature Tt (step S108). As described above, if the target temperature Tt becomes higher than the current blower air temperature t1, the air conditioner 20 enters the dehumidification reheat state, and the chilled water valves 21 and 23 open simultaneously, allowing chilled water and hot water to flow simultaneously, significantly increasing the energy consumption of the entire air conditioning system 10. Therefore, in the dehumidification mode, the target temperature Tt is lowered so that the target temperature Tt becomes higher than the current blower air temperature t1 and the air conditioner 20 does not enter the dehumidification reheat state, or so that even if the air conditioner 20 enters the dehumidification reheat state, energy consumption during reheating is reduced. Note that this reduction amount may be a constant value (for example, the same reduction amount as in the cooling mode) or may vary depending on the difference between the target temperature Tt and the blower air temperature t1.

[0046] If the current operation mode is not the "dehumidification mode" (step S107; No) but the "low-temperature airflow mode" (step S109; Yes), the temperature control unit 51D maintains or increases the target temperature Tt (step S110). In the low-temperature airflow mode, if the difference between the space temperature TR and the airflow temperature t1 becomes even larger, the cold draft described above may occur, potentially causing discomfort to users in the air-conditioned space. For this reason, in order to transition the air conditioning mode to another mode, the temperature control unit 51D maintains or increases the target temperature Tt. Note that whether to maintain or increase the target temperature Tt may be set arbitrarily. The target temperature Tt may be always maintained or always increased in the low-temperature airflow mode. If the airflow temperature t1 is higher than the target temperature Tt, the temperature control unit 51D may increase the target temperature Tt by a constant temperature or by the difference between the airflow temperature t1 and the target temperature Tt. When the blowing air temperature t1 is lower than the target temperature Tt, the temperature control unit 51D may maintain the target temperature Tt. Note that the predetermined threshold value used as the criterion for determining the low-temperature blowing mode may be set as a threshold value at which the possibility of a cold draft occurring increases when the difference between the blowing air temperature t1 and the space temperature TR reaches that threshold value. In such a case, the temperature control unit 51D may increase the target temperature Tt rather than maintain it.

[0047] After steps S104, S106, S108, S110, and S111, temperature control unit 51D waits for the control effect of target temperature Tt (step S112) and then executes step S101 again. The wait for the effect may be, for example, 5 to 10 minutes.

[0048] As described above, in this embodiment, the information acquisition unit 51A of the air conditioning control device 50 acquires the temperature (supply air temperature t1) of the conditioned air that the air conditioner 20 supplies to the air-conditioned space, the air conditioning state (total control status) of the air-conditioned space, and the operation mode of the air conditioner 20. Furthermore, the feedback control unit 51B feedback-controls the air conditioner 20 based on the target temperature Tt and the temperature of the conditioned air (supply air temperature t1). Furthermore, when the air conditioning state (total control status) is in the first state ("Cooling (supply air temperature changeable)"), in which the air volume of the conditioned air can be reduced by lowering the target temperature Tt, the temperature control unit 51D controls the target temperature Tt according to the operation mode of the air conditioner 20 at that time. The operation modes include a cooling mode (non-outdoor air cooling mode) and an outdoor air cooling mode. The temperature control unit 51D lowers the target temperature Tt when the air conditioning state is the first state and the operation mode is the cooling mode (non-outdoor air cooling mode). On the other hand, the temperature control unit 51D maintains or raises the target temperature Tt when the air conditioning state is the first state and the operation mode is the outdoor air cooling mode. With this configuration, as described above, it is possible to reduce the increase in the amount of conditioned air sent out, thereby achieving energy conservation throughout the air conditioning system 10, including the air conditioner 20.

[0049] As described above, the operation modes preferably include a dehumidification mode. Furthermore, the temperature control unit 51D preferably lowers the target temperature Tt when the air conditioning state is the first state and the operation mode is the dehumidification mode. This makes it less likely that the dehumidification reheat state described above will occur, thereby realizing energy savings.

[0050] Furthermore, as described above, the air conditioner 20 may be configured to blow conditioned air into the target space from the top of the target space. Furthermore, the operating modes may include a low-temperature air-blowing mode in which the difference between the temperature of the conditioned air (blowing air temperature t1) and the space temperature TR of the target space reaches a predetermined threshold. The temperature control unit 51D may maintain or raise the target temperature Tt when the air conditioning state is in the first state and the operating mode is the low-temperature air-blowing mode. This makes it less likely that the cold draft described above will occur.

[0051] Furthermore, as described above, the air conditioning state may include a first state and a second state ("request for increased cooling capacity") in which the desired cooling effect cannot be achieved unless the target temperature is lowered. When the air conditioning state is in the second state, the temperature control unit 51D lowers the target temperature Tt regardless of the operating mode. This allows the air conditioning state to be specified in detail, enabling appropriate cooling.

[0052] The present invention is not limited to the above-described embodiments and modifications, nor to the above supplementary notes. For example, the present invention includes various modifications to the above disclosure that would be understandable to a person skilled in the art within the scope of the technical concept of the present invention. For example, the present invention is applicable to various control devices that control air conditioners or air conditioning systems other than VAV systems. The above-described configurations can be combined as appropriate within a consistent range. Furthermore, any configuration can be deleted as appropriate. The air conditioning control device 50 includes a processing unit consisting of at least one or a combination of one or more of one or more processors 51, one or more ASICs (Application Specific Integrated Circuits), and one or more FPGAs (Field-Programmable Gate Arrays), and each of the above units 51A to 51D may be composed of the processing unit. The program may be stored in a computer-readable non-transitory storage medium.

[0053] (Addendum) The configurations disclosed in this specification, which are examples of the above-described embodiments and modifications, are described below. Note that the present invention is not limited to the following configurations. (Appendix 1) an acquisition unit that acquires the temperature of conditioned air sent by an air conditioner to a space to be air-conditioned, the air conditioning state of the space to be air-conditioned, and the operation mode of the air conditioner; a feedback control unit that feedback controls the air conditioner based on a target temperature and the temperature of the conditioned air; a temperature control unit that controls the target temperature in accordance with the operation mode when the air conditioning state is a first state in which the air volume of the conditioned air can be reduced by lowering the target temperature, The operation modes include a cooling mode and an outdoor air cooling mode, The temperature control unit When the air conditioning state is the first state and the operation mode is the cooling mode, the target temperature is lowered; maintaining or increasing the target temperature when the air conditioning state is in the first state and the operation mode is the outside air cooling mode; Air conditioning control device. (Appendix 2) The operation modes further include a dehumidification mode, the temperature control unit lowers the target temperature when the air conditioning state is the first state and the operation mode is the dehumidification mode. 10. The air conditioning control device of claim 1. (Appendix 3) the air conditioner is configured to blow the conditioned air into the air-conditioned space from an upper portion of the air-conditioned space, The operation modes include a low-temperature air blowing mode in which a difference between the temperature of the conditioned air and the space temperature of the air-conditioned space reaches a predetermined threshold value; the temperature control unit maintains or increases the target temperature when the air conditioning state is the first state and the operation mode is the low-temperature air blowing mode, 3. The air conditioning control device according to claim 1 or 2. (Appendix 4) the air conditioning state includes the first state and a second state in which a desired cooling effect cannot be obtained unless the target temperature is lowered, the temperature control unit lowers the target temperature when the air conditioning state is in the second state regardless of the operation mode. 4. The air conditioning control device according to any one of Supplementary notes 1 to 3. (Appendix 5) A program that causes a computer to function as the air conditioning control device according to any one of appendices 1 to 4. [Explanation of symbols]

[0054] 10...air conditioning system, 20...air conditioner, 21...chilled water valve, 22...cooling coil, 23...hot water valve, 24...heating coil, 25...blower, 30, 30-1 to 30-N...VAV unit, 40, 40-1 to 40-N...VAV controller, 50...air conditioning control device, 51...processor, 51A...information acquisition unit, 51B...feedback control unit, 51C...operation mode identification unit, 51D...temperature control unit, 52...storage, 90, 90-1 to 90-N...room, 91, 91-1 to 91-N...blowing unit, 92, 92-1 to 92-N...temperature sensor, 93, 93-1 to 93-N...operation panel, D1 to D2...return air duct, DP1 to DP3...damper, P...program, T1...temperature sensor, T2...temperature sensor, H1...humidity sensor.

Claims

1. an acquisition unit that acquires the temperature of conditioned air sent by an air conditioner to a space to be air-conditioned, the air conditioning state of the space to be air-conditioned, and the operation mode of the air conditioner; a feedback control unit that feedback controls the air conditioner based on a target temperature and the temperature of the conditioned air; a temperature control unit that controls the target temperature in accordance with the operation mode when the air conditioning state is a first state in which the air volume of the conditioned air can be reduced by reducing the target temperature, The operation modes include a cooling mode and an outdoor air cooling mode, The temperature control unit When the air conditioning state is the first state and the operation mode is the cooling mode, the target temperature is lowered; maintaining or increasing the target temperature when the air conditioning state is in the first state and the operation mode is the outside air cooling mode; Air conditioning control device.

2. The operation modes further include a dehumidification mode, the temperature control unit lowers the target temperature when the air conditioning state is the first state and the operation mode is the dehumidification mode. The air conditioning control device according to claim 1 .

3. the air conditioner is configured to blow the conditioned air into the air-conditioned space from an upper portion of the air-conditioned space, The operation modes include a low-temperature air blowing mode in which a difference between the temperature of the conditioned air and the space temperature of the air-conditioned space reaches a predetermined threshold value; the temperature control unit maintains or increases the target temperature when the air conditioning state is the first state and the operation mode is the low-temperature air blowing mode. The air conditioning control device according to claim 1 .

4. the air conditioning state includes the first state and a second state in which a desired cooling effect cannot be obtained unless the target temperature is lowered, the temperature control unit lowers the target temperature when the air conditioning state is in the second state regardless of the operation mode. The air conditioning control device according to claim 1 .

5. A program that causes a computer to function as the air conditioning control device according to claim 1.

Images