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 temperature of conditioned air that is cooled by an air conditioner and blown out from the top of a 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] During cooling, if the temperature of the conditioned air sent to a room that constitutes the air-conditioned space drops significantly below the room temperature, a cold draft is likely to occur. A cold draft during cooling refers to a cold air current that descends at a speed faster than necessary, and people who are exposed to this cold air current feel an excessive cold sensation. Therefore, it is better to avoid cold drafts, but Patent Document 1 does not disclose any technology for suppressing the occurrence of cold drafts.

[0005] An object of the present invention is to suppress the occurrence of cold drafts during cooling. [Means for solving the problem]

[0006] The air conditioning control device of the present invention is an air conditioning control device that controls the temperature of the conditioned air that is cooled by an air conditioner and blown out from the top of the space to be conditioned, and is equipped with an acquisition unit that acquires the temperature of the conditioned air as a blowing temperature and the temperature of the space to be conditioned as a space temperature, a feedback control unit that feedback controls the air conditioner based on a target temperature and the blowing temperature, and a temperature control unit that controls the target temperature based on the space temperature so that the temperature difference between the temperature of the space to be conditioned and the temperature of the conditioned air does not exceed a predetermined value.

[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 occurrence of cold drafts during cooling is suppressed. [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 block diagram showing the configuration of the air conditioning control device. [Figure 3] FIG. 3 is a flowchart of the first temperature control process. [Figure 4] FIG. 4 is a flowchart of the second 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, and the like.

[0012] The air conditioner 20 is configured to include an electric valve 21, a cooling coil 22, an electric valve 23, a heating coil 24, and a blower 25. The electric valve 21 controls the flow rate of chilled water flowing through the cooling coil 22. The electric valve 23 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 operation or heated by the heating coil 24 during heating as conditioned air to an air supply duct D1 located above the ceiling of the building. Note that the 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 t of the conditioned air by the aperture of the electric valve 21 (i.e., the flow rate of chilled water) and the aperture of the electric valve 23 (i.e., the flow rate of 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. For example, the technology described in Patent Document 1 can be used to determine the air conditioning state. Some of these operations are exemplified below. Note that since the present embodiment aims to suppress the occurrence of cold drafts during cooling, some of the operations during cooling are 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 cooling set temperature) or the difference is less than the predetermined difference, and the current requested airflow Rf is greater than the predetermined airflow, the VAV controller 40 determines that the current state is one in which the temperature t of the conditioned air (the blow-out temperature t1 described below) can be lowered and the requested airflow Rf can be lowered, and supplies the air conditioning state of “Cooling (blow-out 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 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.

[0019] The above (2) and (3) are control modes that prioritize lowering the target temperature Tt over increasing the airflow rate of the conditioned air during cooling. This type of control mode is also called a temperature-priority control mode. The control modes also include an airflow-priority control mode that prioritizes increasing the airflow rate (required airflow rate) of the conditioned air over lowering the target temperature Tt. In the airflow-priority control mode, the conditions of (2) and (3) are reversed. Specifically, when the first condition of (2) is met, "Cooling (Satisfied)" is provided to the air conditioning control device 50 instead of "Cooling (Blowout Temperature Changeable)." When the second condition of (3) is met, "Cooling (Satisfied)" is provided to the air conditioning control device 50 instead of "Cooling (Blowout Temperature Changeable)." The control modes also include a status quo mode, which does not change the target temperature Tt, as described below. Hereinafter, the initial control mode is the temperature-priority control mode, and the control mode is changed to the status quo mode or the airflow-priority control mode as needed (details will be described later).

[0020] 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.

[0021] The temperature sensor T1 detects the temperature t of the conditioned air from the air conditioner 20, in other words, the temperature t of the conditioned air blown out from the blowout section 91 and supplied to the room 90. The temperature sensor T1 supplies the detected temperature to the air conditioning control device 50. The temperature sensor T2 detects the temperature of the return air, which is the air flowing through the return air duct D2, and supplies the detected temperature to the air conditioning control device 50.

[0022] The air conditioning control device 50 is configured to control the air conditioning system 10, particularly the motorized valves 21 and 23 and the 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 t 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, 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.

[0023] 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.

[0024] The processor 51 executes the programs stored in the storage 52 to operate as an information acquisition unit 51A, a feedback control unit 51B, a temperature control unit 51C, and an air volume control unit 51D shown in FIG.

[0025] Information acquisition unit 51A acquires the temperatures from temperature sensors T1 and T2 as discharge temperature t1 and return air temperature t2, and also acquires the air conditioning state and room temperature Tr of each of rooms 90-1 to 90-N from each of VAV controllers 40-1 to 40-N. Note that the air conditioning states of rooms 90-1 to 90-N are collectively referred to as the air conditioning states of the spaces to be air conditioned.

[0026] 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.

[0027] The feedback control unit 51B feedback controls the cooling capacity (i.e., the opening degree of the electric valve 21) or the heating capacity (i.e., the opening degree of the electric valve 23) of the air conditioner 20 so that the temperature t of the conditioned air (blowout temperature t1) matches the target temperature Tt, based on the blowout temperature t1 (and / or return air temperature t2) acquired by the information acquisition unit 51A.

[0028] The temperature control unit 51C controls the temperature t of the conditioned air by controlling the target temperature Tt based on the air conditioning state of the air conditioned space acquired by the information acquisition unit 51A (i.e., the air conditioning state of each of the rooms 90-1 to 90-N). The control of the target temperature Tt is performed every time the information acquisition unit 51A acquires the air conditioning state that is periodically specified by each VAV controller 40.

[0029] If the air conditioning status acquired by the information acquisition unit 51A includes a "request to increase cooling capacity," the temperature control unit 51C lowers the target temperature Tt by 1.0°C. This lowers the temperature t of the conditioned air (i.e., the subsequent blowout temperature t1). The amount of reduction in the target temperature Tt is arbitrary.

[0030] When all of the air conditioning states acquired by the information acquisition unit 51A are "Cooling (blowout temperature changeable)," the temperature control unit 51C lowers the target temperature Tt by 0.5°C if the control mode is the temperature-priority control mode, and raises the target temperature Tt by 0.5°C if the control mode is the airflow-priority control mode. When "Cooling (blowout temperature changeable)" is in the temperature-priority control mode, the total air volume of the conditioned air is large. In this case, the temperature control unit 51C lowers the temperature t of the conditioned air to reduce the air volume of the conditioned air. When "Cooling (blowout temperature changeable)" is in the airflow-priority control mode, the total air volume of the conditioned air is small. In this case, the temperature control unit 51C raises the temperature t of the conditioned air to increase the air volume of the conditioned air. Note that the range of decrease or increase in the target temperature Tt is arbitrary, but is smaller than the range of change in the "cooling capacity increase request."

[0031] The temperature control unit 51C does not change the target temperature Tt when the air conditioning status acquired by the information acquisition unit 51A includes only two types, "Cooling (Satisfied)" and "Cooling (Air Outlet Temperature Changeable)," because such a status is one in which the user is relatively satisfied.

[0032] The temperature control unit 51C changes the target temperature Tt between a predetermined upper limit target temperature and a predetermined lower limit target temperature.

[0033] When the control mode is the status quo mode, the temperature control unit 51C does not change the target temperature Tt even in each of the above cases. However, in the case of a request to increase the cooling capacity, the target temperature Tt may be changed. The temperature control unit 51C may change the target temperature Tt when the air conditioning state includes only two types, "Cooling (Satisfied)" and "Cooling (Blowout Temperature Changeable)", and may not change the target temperature Tt when the air conditioning state includes only "Cooling (Satisfied)".

[0034] Based on the space temperature TR acquired by the information acquisition unit 51A, the temperature control unit 51C controls the temperature t of the conditioned air so that the temperature difference obtained by subtracting the temperature t of the conditioned air (blowout temperature t1) from the temperature of the space to be air-conditioned (space temperature TR) does not exceed a predetermined value Th1. The predetermined value Th1 indicates the temperature difference above which a cold draft is likely to occur. The predetermined value Th1 varies depending on the height of the ceiling of the space to be air-conditioned, the position and shape of the blowout unit 91, etc., but is, for example, 10°C. By performing the above control by the temperature control unit 51C, the difference between the space temperature TR (room temperature Tr, etc.) and the temperature t of the conditioned air is prevented from becoming too large, and the occurrence of a cold draft is suppressed. Details of this type of control will be described later.

[0035] The air volume control unit 51D calculates the total required air volume RF of the entire system from the required air volumes Rf sent from each of the VAV controllers 40-1 to 40-N, and controls the blower 25 of the air conditioner 20 (for example, the rotation speed of the fan) so as to ensure this total required air volume RF.

[0036] Next, an example of the control performed by the temperature control unit 51C to suppress the occurrence of a cold draft will be described.

[0037] The temperature control unit 51C performs a first temperature control process shown in Fig. 3. The process of Fig. 3 is performed periodically, for example, every time the space temperature TR is acquired.

[0038] Temperature control unit 51C first performs a calculation to subtract a predetermined value Th1 from the current space temperature TR acquired by information acquisition unit 51A (step S11). The value K obtained by this calculation corresponds to the conditioned air temperature t (for example, a temperature 10°C different from space temperature TR) below which a cold draft is likely to occur if the conditioned air temperature t (blowout temperature t1) is lower than the value K. In other words, a cold draft is likely to occur if the conditioned air temperature t (blowout temperature t1) is lower than the value K.

[0039] Next, the temperature control unit 51C determines whether the lower limit target temperature of the target temperature Tt is lower than the value K (step S12). If the lower limit target temperature is lower than the value K, the target temperature Tt may become lower than the value K. In other words, the temperature t of the conditioned air controlled to the target temperature Tt may become lower than the value K, increasing the possibility of a cold draft occurring.

[0040] Therefore, if the lower limit target temperature is lower than value K (step S12; Yes), temperature control unit 51C changes the lower limit target temperature to a temperature equal to or higher than value K (for example, a temperature of K+1° C.) (step S13). This prevents the target temperature Tt (and thus the blown temperature t1) from becoming lower than value K in the subsequent feedback control, thereby suppressing the occurrence of a cold draft.

[0041] If the lower limit target temperature is equal to or greater than value K (step S12; No) and the difference between the lower limit target temperature and value K is large, temperature control unit 51C lowers the lower limit target temperature to value K + a predetermined temperature (for example, 1°C) (step S14). This allows the range of change in target temperature Tt to be increased. Note that in step S14, if the difference between the lower limit target temperature and value K is not large, the lower limit target value will not change. After steps S13 and S14, the first temperature control process ends.

[0042] As a result of the above series of processes, for example, if the space temperature TR is 27°C, the lower limit target temperature is 15°C, and the predetermined value Th1 is 10°C, then value K = 27°C - 10°C = 17°C. Since value K is greater than the lower limit target temperature, temperature control unit 51C changes the lower limit target temperature to 18°C, or 17°C + 1°C. For example, if the space temperature TR is 23°C, the lower limit target temperature is 15°C, and the predetermined value Th1 is 10°C, then value K = 23°C - 10°C = 13°C. Since value K is less than the lower limit target temperature, temperature control unit 51C either leaves the lower limit target temperature as is or changes it to 14°C, or 13°C + 1°C. This type of control prevents the temperature difference calculated by space temperature TR - target temperature Tt (in other words, conditioned air temperature t or blowout temperature t1) from becoming larger than necessary, thereby suppressing the occurrence of a cold draft.

[0043] The temperature control unit 51C may execute a second temperature control process shown in Fig. 4 instead of or in addition to the first temperature control process. The process shown in Fig. 4 is a process for suppressing the occurrence of a cold draft based on the current target temperature Tt. The process shown in Fig. 4 is executed in parallel with a process for controlling the target temperature Tt based on the air conditioning state.

[0044] Temperature control unit 51C first performs a calculation to subtract a predetermined value Th1 from the current space temperature TR acquired by information acquisition unit 51A (step S21). The value K obtained by this calculation is the same as the value K obtained in the first temperature control process.

[0045] Next, temperature control unit 51C determines whether the current target temperature Tt is lower than value K (step S22). If the current target temperature Tt is lower than value K, blow-out temperature t1 becomes lower than the temperature of value K, and a cold draft becomes more likely to occur.

[0046] If the current target temperature Tt is lower than the value K (step S22; Yes), the temperature control unit 51C updates the control mode to a control mode that maintains or increases the target temperature Tt in order to suppress the occurrence of a cold draft (step S23). Such control modes include the status quo mode and the air volume priority control mode described above.

[0047] In step S23, if the current control mode is the temperature-priority control mode (initial mode) described above, temperature control unit 51C changes the control mode to status quo mode. In status quo mode, the target temperature Tt is maintained without change even if there is a subsequent change in the air conditioning state. The change to on-site maintenance mode is also notified to VAV controller 40. Upon receiving this notification, VAV controller 40 may operate so as not to change the requested airflow Rf.

[0048] In step S23 above, if the current control mode is the status quo mode, temperature control unit 51C changes the control mode to the air volume priority control mode. This change is also notified to VAV controller 40. As a result, as described above, the condition for the requested air volume Rf that sets the air conditioning state to "cooling (blowout temperature changeable)" is changed. As described above, when the air conditioning state is "cooling (blowout temperature changeable)" due to the air volume priority control mode, the target temperature Tt rises, and the air volume of the conditioned air (requested air volume Rf) increases accordingly. This maintains the cooling capacity.

[0049] If the current control mode is the air volume priority control mode, temperature control unit 51C maintains that mode.

[0050] If the current target temperature Tt is equal to or higher than the value K (step S22; No), the possibility of a cold draft occurring is low, so temperature control unit 51C updates the control mode to the temperature-priority control mode (step S24). Note that if the current control mode is the temperature-priority control mode, that mode is maintained.

[0051] After executing step S23 or S24, temperature control unit 51C waits for a predetermined time (for example, 5 to 10 minutes) to wait for the effect of the change in control mode (step S25). Thereafter, temperature control unit 51C performs the process of step S21.

[0052] As a result of the above series of processes, for example, if the space temperature TR is 27°C and the predetermined value Th1 is 10°C, the value K = 27°C - 10°C = 17°C. If the target temperature Tt is 15°C and the value K > the target temperature Tt, the temperature t of the conditioned air (discharge temperature t1) may fall below the value K = 17°C, potentially making a cold draft more likely to occur. Therefore, in this embodiment, the control mode is first changed from the temperature-priority control mode to the on-site maintenance mode. This prevents the target temperature Tt from changing even in air conditioning states such as "Cooling (discharge temperature changeable)," and the system waits for a while via step S25. If the value K > the target temperature Tt is maintained even after a predetermined time has elapsed, for example, because the space temperature TR does not decrease, the control mode is changed to the airflow-priority control mode. For example, the target temperature Tt increases due to "Cooling (discharge temperature changeable)," actively resolving the condition of "K > target temperature Tt." The above-described processes suppress the occurrence of a cold draft. When the predetermined time has elapsed and the condition K>Tt is resolved, for example, due to a drop in the space temperature TR, the control mode is returned from the status quo mode to the temperature-priority control mode, thereby realizing a return to the initial mode.

[0053] In the above series of processes, the control mode is changed from the temperature priority control mode to the air volume priority control mode via the on-site maintenance mode, but it may also be changed directly from the temperature priority control mode to the air volume priority control mode.

[0054] The configurations disclosed in this specification, taking the above embodiment as an example, are described below. Note that the present invention is not limited to the configurations described below. The symbols and parentheses added to the elements below indicate the correspondence with the elements in the above embodiment. Only a portion of the configuration of each description may be added to other descriptions.

[0055] (Appendix 1) An air conditioning control device (50) that controls the temperature (t) of conditioned air cooled by an air conditioner (20) and blown out from an upper portion of air-conditioned spaces (90-1 to 90-N), an acquisition unit (51A) that acquires the temperature t of the conditioned air as a blowout temperature (t1) and acquires the temperatures of the air-conditioned spaces (90-1 to 90-N) as space temperatures (TR); a feedback control unit (51B) that performs feedback control of the air conditioner (20) based on the target temperature (Tt) and the blowout temperature (t1); a temperature control unit (51C) that controls the target temperature (Tt) based on the space temperature (TR) so that the temperature difference between the temperatures of the air-conditioned spaces (90-1 to 90-N) and the temperature (t) of the conditioned air does not exceed a predetermined value (Th1); An air conditioning control device 50 comprising:

[0056] The method of controlling the target temperature Tt by the temperature control unit 51C is not limited to the method described in the above embodiment. For example, the temperature control unit 51C may increase the target temperature Tt when the difference between the space temperature TR and the blow-out temperature t1 exceeds a predetermined threshold.

[0057] According to the above configuration, the target temperature Tt is controlled so that the temperature difference between the temperature of the air-conditioned spaces 90-1 to 90-N and the temperature t of the conditioned air does not exceed a predetermined value, making it difficult for a temperature difference that makes a cold draft more likely to occur to occur, thereby suppressing the occurrence of a cold draft (including reducing the probability of a cold draft occurring).

[0058] (Appendix 2) The acquisition unit 51A further acquires the air conditioning state of the air conditioned space, The temperature control unit 51C is changing the target temperature Tt within a preset range based on the air conditioning state; By changing the lower limit target temperature so that the difference between the space temperature TR and the lower limit target temperature, which is the lower limit of the range, does not exceed a predetermined threshold, the target temperature Tt is controlled so that the temperature difference does not exceed the predetermined value (for example, a first temperature control process). 10. The air conditioning control device 50 according to claim 1.

[0059] The air conditioning status may be any value that indicates the state of air conditioning in that room 90, and may be, for example, an average value of the deviation between the set temperature SP and the room temperature Tr of each room 90, instead of the control status such as "Cooling (air outlet temperature changeable)." The temperature control unit 51C controls the target temperature Tt so as to reduce the average value of the deviation for each room 90. The predetermined threshold value may be the predetermined value Th1 as in the above embodiment, or may be set to a value smaller than the predetermined value Th1, with the intention of setting the lower limit target temperature higher so as to prevent the occurrence of a cold draft.

[0060] According to the configuration of Supplementary Note 2, the occurrence of cold drafts can be suppressed by simple control.

[0061] (Appendix 3) The temperature control unit 51C maintains the target temperature without lowering it or raises it when the difference between the space temperature TR and the target temperature Tt exceeds or exceeds a predetermined threshold (for example, a second temperature control process), 3. The air conditioning control device 50 according to claim 1 or 2.

[0062] As a configuration example of Supplementary Note 3, when the temperature control unit 51C lowers the target temperature Tt due to the establishment of a predetermined condition (e.g., "Cooling in progress (air outlet temperature changeable)"), if the difference between the lowered target temperature Tt and the space temperature TR exceeds a predetermined threshold, the temperature control unit 51C may maintain the target temperature Tt without lowering it or may raise it. Furthermore, when the temperature control unit 51C detects that the difference between the target temperature Tt and the space temperature TR exceeds the predetermined threshold, the temperature control unit 51C may directly maintain the target temperature Tt without lowering it (e.g., set to prohibit lowering the target temperature Tt) or may raise it, rather than changing the control mode as in the above embodiment. The predetermined threshold may be a predetermined value Th1 as in the above embodiment, or may be set to a value smaller than the predetermined value Th1 so that the target temperature Tt is set high to prevent a cold draft from occurring.

[0063] According to the configuration of Supplementary Note 3, the target temperature is controlled using an index that is relatively highly related to the occurrence of a cold draft, such as the difference between the space temperature TR and the target temperature Tt, so that the occurrence of a cold draft is suppressed with high precision.

[0064] (Appendix 4) The temperature control unit 51C increases the air volume of the conditioned air when increasing the target temperature Tt (second temperature control process), 4. The air conditioning control device 50 according to claim 3.

[0065] The temperature control section 51C may directly instruct the VAV controller 40 to increase the airflow rate, rather than increasing the airflow rate by changing the control mode as in the second temperature control process.

[0066] According to Supplementary Note 4, by increasing the airflow rate, the degree of decrease in cooling capacity can be reduced by increasing the target temperature Tt.

[0067] (Appendix 5) The temperature control unit 51C operates in one of a plurality of control modes, The plurality of control modes include a first mode (temperature priority control mode) in which lowering the target temperature is prioritized over increasing the airflow rate of the conditioned air, and a second mode (airflow rate priority control mode) in which increasing the airflow rate of the conditioned air is prioritized over lowering the target temperature, The temperature control unit 51C is When the difference between the space temperature TR and the target temperature Tt does not exceed the predetermined threshold, the system operates in the first mode (second temperature control process), When the difference between the space temperature and the target temperature exceeds the predetermined threshold, the device operates in the second mode (second temperature control process). 5. The air conditioning control device 50 according to claim 3 or 4.

[0068] According to the above configuration, the occurrence of a cold draft can be suppressed by the control mode.

[0069] (Appendix 6) The plurality of control modes further includes a third mode (status quo mode) in which the target temperature is not changed, The temperature control unit 51C is When the difference between the space temperature and the target temperature exceeds the predetermined threshold, the control mode is changed from the first mode to the third mode (second temperature control process); changing the control mode from the third mode to the second mode when the difference between the space temperature and the target temperature exceeds the predetermined threshold value after changing to the third mode (second temperature control process); changing the control mode from the third mode to the first mode when the difference between the space temperature and the target temperature does not exceed the predetermined threshold value after changing to the third mode (second temperature control process); 6. The air conditioning control device 50 according to claim 5.

[0070] According to the above configuration, a mode in which the target temperature is not changed can be inserted before the second mode, which ensures, for example, a period of time to wait for the space temperature TR to drop, thereby suppressing sudden changes in air conditioning due to differences between the first mode and the second mode.

[0071] (Appendix 7) The temperature difference is 10°C. An air conditioning control device 50 according to any one of Supplementary Notes 1 to 6.

[0072] This effectively prevents the occurrence of cold drafts.

[0073] (Appendix 8) The air-conditioned space includes a plurality of rooms 90-1 to 90-N, The space temperature TR is any one of the average room temperature, the representative room temperature, the maximum value, and the minimum value of the room temperatures of each of the plurality of rooms 90-1 to 90-N. An air conditioning control device 50 according to any one of Supplementary Notes 1 to 7.

[0074] This effectively prevents cold drafts from occurring in multiple rooms.

[0075] (Appendix 9) A program that causes a computer to function as the air conditioning control device 50 described in Supplementary Notes 1 to 8. The program is stored in a computer-readable non-transitory (non-volatile) storage medium such as a storage device.

[0076] The present invention is not limited to the above-described embodiments and modifications, nor to the above-described supplementary notes. For example, the present invention includes various modifications to the above disclosure that are understandable to those 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 configurations listed above can be combined as appropriate within a consistent range. Furthermore, any configuration can be deleted as appropriate. [Explanation of symbols]

[0077] 10...air conditioning system, 20...air conditioner, 21...motor valve, 22...cooling coil, 23...motor valve, 24...heating coil, 25...blower, 30-1 to 30-N...VAV unit, 40-1 to 40-N...VAV controller, 50...air conditioning control device, 51...processor, 51A...information acquisition unit, 51B...feedback control unit, 51C...temperature control unit, 51D...air volume control unit, 52...storage, 90-1 to 90-N...room, 91-1 to 91-N...blowing unit, 92-1 to 92-N...temperature sensor, 93-1 to 93-N...operation panel, D1...air supply duct, D2...return air duct, DP1 to DP3...damper, P...program, T1...temperature sensor, T2...temperature sensor.

Claims

1. An air conditioning control device that controls the temperature of conditioned air cooled by an air conditioner and blown out from an upper part of an air-conditioned space, an acquisition unit that acquires the temperature of the conditioned air as a blowout temperature and acquires the temperature of the air-conditioned space as a space temperature; a feedback control unit that feedback controls the air conditioner based on a target temperature and the blown-out temperature; a temperature control unit that controls the target temperature based on the space temperature so that a temperature difference between the temperature of the air-conditioned space and the temperature of the conditioned air does not exceed a predetermined value; An air conditioning control device comprising:

2. The acquisition unit further acquires an air conditioning state of the air conditioned space, The temperature control unit changing the target temperature within a preset range based on the air conditioning state; By changing the lower limit target temperature so that the difference between the space temperature and the lower limit target temperature, which is the lower limit of the range, does not exceed a predetermined threshold, the target temperature is controlled so that the temperature difference does not exceed the predetermined value. The air conditioning control device according to claim 1 .

3. the temperature control unit maintains the target temperature without lowering it or raises it when the difference between the space temperature and the target temperature exceeds or exceeds a predetermined threshold; The air conditioning control device according to claim 1 .

4. the temperature control unit increases the air volume of the conditioned air when increasing the target temperature, The air conditioning control device according to claim 3 .

5. the temperature control unit operates in one of a plurality of control modes, the plurality of control modes include a first mode in which lowering the target temperature is prioritized over increasing the airflow rate of the conditioned air, and a second mode in which increasing the airflow rate of the conditioned air is prioritized over lowering the target temperature, The temperature control unit operating in the first mode when the difference between the space temperature and the target temperature does not exceed the predetermined threshold; operating in the second mode when the difference between the space temperature and the target temperature exceeds the predetermined threshold. The air conditioning control device according to claim 3 .

6. the plurality of control modes further includes a third mode in which the target temperature is not changed; The temperature control unit changing the control mode from the first mode to the third mode when the difference between the space temperature and the target temperature exceeds the predetermined threshold; changing the control mode from the third mode to the second mode when a difference between the space temperature and the target temperature exceeds the predetermined threshold value after the change to the third mode; changing the control mode from the third mode to the first mode when the difference between the space temperature and the target temperature does not exceed the predetermined threshold value after changing to the third mode; The air conditioning control device according to claim 5 .

7. the air-conditioned space includes a plurality of rooms, The space temperature is any one of an average room temperature, a representative room temperature, a maximum value, and a minimum value of the room temperatures of each of the plurality of rooms. The air conditioning control device according to claim 1 .

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

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