Air conditioning system, control method of air conditioning system, and program

Abstract

To improve operation efficiency while performing finer temperature adjustment in an indoor unit.SOLUTION: An air conditioning system includes: an outdoor unit equipped with a compressor; a plurality of indoor units each equipped with a heat exchanger for performing heat exchange between a heat medium supplied from the compressor and indoor air; an indoor temperature detection part for detecting an indoor temperature of the room where each of the plurality of indoor units is installed; an outdoor unit control device for controlling the operation of the outdoor unit; and an indoor unit control device provided in each of the plurality of indoor units for controlling the operation of the indoor unit according to the set temperature set from the outside. The outdoor unit control device includes a setting part for setting a target pressure saturation temperature for adjusting output of the compressor at least on the basis of an initial target pressure saturation temperature of the heat medium in the compressor set beforehand, a difference in temperatures between a set temperature set to the indoor unit control device and an indoor temperature detected by the indoor temperature detection part, and an amount of change per unit time in the difference in the temperatures.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to an air conditioning system, a control method for an air conditioning system, and a program. [Background technology]

[0002] In an air conditioning system in which multiple indoor units are connected to one outdoor unit, the rotation speed of the compressor installed in the outdoor unit is controlled to supply medium according to the air conditioning load requirement level exerted by each indoor unit (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2014 / 103028 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in a plurality of indoor units, the load demand levels from the plurality of indoor units may vary widely depending on the environment of the room in which each indoor unit is installed, the preferences of the users of the room, etc. For this reason, the compressor in the outdoor unit is operated so that medium can be supplied to the plurality of indoor units with a sufficient margin with respect to the load demand levels from the plurality of indoor units. From the perspective of the indoor unit, then, a medium with a significantly higher capacity than the load requirement level is supplied. As a result, the difference between the temperature of the medium flowing through the heat exchanger of the indoor unit and the room temperature becomes large, and in order to adjust the room temperature to the set temperature, the heat exchanger needs to be intermittently turned on and off repeatedly. This causes the room temperature to frequently rise and fall, making it difficult to stably adjust the room temperature to the set temperature. In addition, the outdoor unit needs to output with a sufficient margin in response to the load demand levels from a plurality of indoor units, and there is room for improvement in operational efficiency.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide an air conditioning system, an air conditioning system control method, and a program that can improve operating efficiency while performing more precise temperature adjustment in the indoor unit. [Means for solving the problem]

[0006] In order to solve the above problems, an air conditioning system according to the present disclosure comprises an outdoor unit having a compressor that compresses a heat medium, a plurality of indoor units connected to the outdoor unit via a medium circuit through which the heat medium circulates and equipped with a heat exchanger that performs heat exchange between the heat medium supplied from the compressor via the medium circuit and indoor air, an indoor temperature detection unit that detects the indoor temperature of a room in which each of the plurality of indoor units is installed, an outdoor unit control device that controls the operation of the outdoor unit, and an indoor unit control device that is provided in each of the plurality of indoor units and controls the operation of the indoor unit in accordance with a set temperature that is set from outside, wherein the outdoor unit control device includes at least a setting unit that sets a target pressure saturation temperature for adjusting the output of the compressor based on a preset initial target pressure saturation temperature of the heat medium in the compressor, a temperature difference between the set temperature set in the indoor unit control device and the indoor temperature detected by the indoor temperature detection unit, and an amount of change in the temperature difference per unit time.

[0007] The control method for an air conditioning system according to the present disclosure obtains the temperature difference between the indoor temperature of a room in which each of a plurality of indoor units is installed and the set temperature of the indoor unit, and the amount of change per unit time of the temperature difference between the indoor temperature and the set temperature, and sets a target pressure saturation temperature for adjusting the output of the outdoor unit compressor based on a preset initial target pressure saturation temperature of the heat medium in the compressor, the temperature difference between the set temperature and the indoor temperature, and the amount of change per unit time of the temperature difference.

[0008] The program of the present disclosure causes a computer of an air conditioning system to execute a process of acquiring the temperature difference between the indoor temperature of a room in which each of a plurality of indoor units is installed and the set temperature of the indoor unit, and the amount of change per unit time of the temperature difference between the indoor temperature and the set temperature, and setting a target pressure saturation temperature for adjusting the output of the compressor of the outdoor unit based on a preset initial target pressure saturation temperature of the heat medium in the compressor, the temperature difference between the set temperature and the indoor temperature, and the amount of change per unit time of the temperature difference. Effect of the Invention

[0009] According to the air conditioning system, control method for an air conditioning system, and program of the present disclosure, it is possible to improve the operating efficiency while performing more precise temperature adjustment in the indoor units. [Brief description of the drawings]

[0010] [Figure 1] 1 is a diagram illustrating a configuration of an air conditioning system according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is a functional block diagram of an indoor control device of the air conditioning system. [Diagram 3] FIG. 11 is a diagram showing an example of a code substitution map used to convert the numerical value of the temperature difference and the numerical value of the amount of change into codes consisting of integers in the indoor control device. [Figure 4] FIG. 2 is a functional block diagram of an outdoor control device of the air conditioning system. [Diagram 5] 13 is an example of correlation information indicating a correlation between the outdoor temperature and the reference pressure saturation temperature during cooling operation. [Figure 6] FIG. 13 is a diagram illustrating an example of map information in which a code is associated with a correction value of a target pressure saturation temperature that is associated in advance with the code. [Figure 7] FIG. 11 is a diagram showing examples of upper limit values ​​of multiple stages of pressure saturation temperatures according to energy saving levels during cooling operation. [Figure 8] 4 is a flowchart showing the steps of a control method in the indoor control device. [Figure 9]4 is a flowchart showing the steps of a control method in the outdoor control device. [Figure 10] 13 is an example of correlation information indicating a correlation between the outdoor temperature and the reference pressure saturation temperature during heating operation. [Figure 11] FIG. 11 is a diagram showing examples of upper limit values ​​of multiple stages of pressure saturation temperatures according to energy saving levels during heating operation. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment for carrying out an air conditioning system, a control method for an air conditioning system, and a program according to the present disclosure will be described with reference to the accompanying drawings. However, the present disclosure is not limited to the embodiment. (Air conditioning system configuration) As shown in FIG. 1, the air conditioning system 1 includes one outdoor unit 2 and a plurality of indoor units 3.

[0012] (Outdoor unit configuration) The outdoor unit 2 is installed outside the building. The outdoor unit 2 is connected to a plurality of indoor units 3 via connection piping 5. The outdoor unit 2 includes a compressor 21, a condenser (not shown), a fan (not shown), an expansion valve (not shown), a switching valve (not shown), an outdoor temperature sensor 25, a pressure sensor 27, and an outdoor unit control device 50.

[0013] The compressor 21, condenser, fan, expansion valve, and switching valve are provided on a medium circuit (not shown). The compressor 21 compresses the heat medium (so-called refrigerant) flowing in a heat medium pipe constituting the medium circuit. The condenser exchanges heat between the outdoor air and the heat medium flowing in the heat medium pipe. The fan sends outside air toward the condenser. The expansion valve expands the heat medium that has passed through the condenser. The switching valve switches the flow of the heat medium in the medium circuit to switch between cooling operation and heating operation.

[0014] The outdoor temperature sensor 25 detects the temperature outside (outdoors) where the outdoor unit 23 is installed. The pressure sensor 27 detects the pressure of the heat medium in the compressor 21. The pressure sensor 27 includes an suction side sensor 27a that detects the pressure of the heat medium on the suction side of the compressor 21 during cooling operation, and a discharge side sensor 27b that detects the pressure of the heat medium on the discharge side of the compressor 21 during heating operation.

[0015] (Indoor unit configuration) The multiple indoor units 3 are each installed in a room of a building. Each indoor unit 3 performs cooling operation, heating operation, etc. to condition the air in the room. Each indoor unit 3 performs cooling operation, heating operation, etc. to condition the air in the room. The indoor unit 3 is equipped with a heat exchanger (evaporator) 33, an indoor temperature sensor 31, a humidity sensor 32, and an indoor unit control device 40.

[0016] The evaporators 33 of the multiple indoor units 3 are connected to one outdoor unit 2 via a connecting pipe 5. The connecting pipe 5 constitutes a part of a medium circuit (not shown).

[0017] The indoor temperature sensor 31 detects the temperature in the room where the indoor unit 3 is installed. The humidity sensor 32 detects the humidity in the room where the indoor unit 3 is installed.

[0018] The outdoor unit control device 50 of the outdoor unit 2 and the indoor unit control devices 40 of each of the plurality of indoor units 3 are electrically connected via signal lines (not shown).

[0019] (Configuration of indoor unit control device) The indoor unit control device 40 can be configured using a computer such as a microcomputer or a CPU (Central Processing Unit), and hardware such as peripheral circuits and devices of the computer. In this embodiment, the indoor unit control device 40 is configured by a control board equipped with a microcomputer. The indoor unit control device 40 controls the operation of the indoor unit 3 according to the set temperature and other settings set from the outside. As shown in FIG. 2, the indoor unit control device 40 includes an information acquisition unit 41, an external input reception unit 42, an operation control unit 43, a calculation unit 44, a code replacement unit 45, an output unit 46, and a code storage unit 47 as a functional configuration configured by a combination of hardware and software such as a program executed by the computer.

[0020] The information acquisition unit 41 acquires information on the indoor temperature detected by the indoor temperature sensor 31 and the humidity detected by the humidity sensor 32. In this embodiment, the information acquisition unit 41 acquires the indoor temperature detected by the indoor temperature sensor 31 at preset time intervals. Here, the set value of the time interval for acquiring the indoor temperature detected by the indoor temperature sensor 31 is, for example, one minute. The set value of this time interval is not limited to one minute, and may be every 10 seconds, every 30 seconds, every 5 minutes, every 10 minutes, etc. In the following description, the time interval (set value) for acquiring the indoor temperature detected by the indoor temperature sensor 31 by the information acquisition unit 41 is referred to as a "unit time". In other words, the information acquisition unit 41 repeatedly acquires the indoor temperature detected by the indoor temperature sensor 31 at preset unit times.

[0021] The external input receiving unit 42 is capable of receiving a selection of a plurality of operation modes based on a user's input from an external remote controller 38, etc. The external input receiving unit 42 receives an input of a set temperature based on a user's input from an external remote controller 38, etc.

[0022] The indoor unit 3 allows a user of the air conditioning system 1 to select a plurality of operation modes, such as heating operation, cooling operation, etc., using a remote controller 38 of the indoor unit 3 or the like. In addition, the indoor unit 3 is configured such that the user can select an energy saving level during operation from a plurality of stages as an operation mode of the indoor unit 3 on the remote controller 38 of the indoor unit 3, etc. For example, in this embodiment, the indoor unit 3 has the following energy saving levels during operation: Lv1: Eco Mode Low Lv2: Eco Mode Medium Lv3: Eco Mode High Lv4: Eco Mode Super High These four energy saving levels are set in the order of increasing energy saving level: Lv1: Eco mode Low, Lv2: Eco mode Medium, Lv3: Eco mode High, Lv4: Eco mode Super High. In other words, these four energy saving levels are set in the order of decreasing capacity required for the outdoor unit 2: Lv1: Eco mode Low, Lv2: Eco mode Medium, Lv3: Eco mode High, Lv4: Eco mode Super High.

[0023] When the external input receiving unit 42 receives that an operation mode such as heating operation or cooling operation has been selected, it notifies the operation control unit 43 of the selected operation mode. When the external input receiving unit 42 receives that any one of Lv1: Eco mode Low, Lv2: Eco mode Medium, Lv3: Eco mode High, and Lv4: Eco mode Super High has been selected as the energy saving level setting for energy saving operation, it notifies the operation control unit 43 of the type of the selected energy saving level.

[0024] The operation control unit 43 controls the operation of the indoor unit 3 based on the acquired indoor temperature and humidity. The operation control unit 43 controls the indoor unit 3 based on the set temperature, the indoor temperature detected by the indoor temperature sensor 31, and the indoor humidity detected by the humidity sensor 32 so that the indoor temperature approaches the set temperature within a predetermined humidity range. Note that the indoor unit 3 may be configured without the humidity sensor 32. In this case, the operation control unit 43 controls the indoor unit 3 based on the set temperature and the indoor temperature detected by the indoor temperature sensor 31 so that the indoor temperature approaches the set temperature.

[0025] When the calculation unit 44 detects the indoor temperature Tr for the second time or later, it calculates the temperature difference E(t) between the set temperature Ts of the indoor unit 3 received by the external input receiving unit 42 and the indoor temperature Tr detected by the indoor temperature sensor 31 using the following formula (1). E(t)=Ts-Tr …(1) Furthermore, the calculation unit 44 calculates the amount of change ΔE(t) per unit time t of the temperature difference E(t) calculated in (1) by the following formula (2). ΔE(t)=E(t)-ΔE(t-1) …(2)

[0026] Here, when the detection unit of the indoor temperature Tr is, for example, accurate to two decimal places or more, it is preferable to quantize the detected numerical value in order to reduce the processing load. For example, in the numerical value of the calculation result of the temperature difference E(t), If the value in the first decimal place is "0, 1, or 2," the value after quantization will be "0.00." If the value in the first decimal place is "3, 4", the value after quantization will be "0.25". If the value in the first decimal place is "5, 6, 7", the value after quantization will be "0.50". If the value of the first decimal place is "8, 9", the value after quantization will be "0.75". For example, if the calculation result of the temperature difference E(t) is "3.84", the value to the first decimal place is "8", so the temperature difference E(t) after quantization is set to "3.75". The quantization of the numerical values ​​in the calculation unit 44 is not limited to the method exemplified here, and other appropriate methods such as rounding off, rounding up, rounding down, etc. may be used.

[0027] The sign replacement unit 45 replaces the numerical values ​​of the temperature difference E(t) and the amount of change ΔE(t) calculated by the calculation unit 44 with signs consisting of integers that are associated in advance. To this end, the indoor unit control device 40 converts the numerical value of the temperature difference E(t) and the numerical value of the amount of change ΔE(t) into codes consisting of integers, so the sign storage unit 47 stores, for example, a sign replacement map M1 as shown in Fig. 3. 3, for example, each value of the temperature difference E(t) after quantization as described above is associated with a first code N1 consisting of integers starting from 0, such as 0, 1, 2, 3, .... Furthermore, the amount of change in the temperature difference per unit time ΔE(t) is associated with a second code N2 consisting of integers starting from 0, such as 0, 1, 2, 3, .... The sign replacement unit 45 refers to the sign replacement map M1 in the sign storage unit 47, and generates a code (N1, N2) including a first code N1 and a second code N2 corresponding to the numerical value of the temperature difference E(t) and the numerical value of the change amount ΔE(t) calculated by the calculation unit 44. For example, in the sign replacement map M1 of Fig. 3, when the calculated temperature difference E(t) is "-3.75" and the change amount ΔE(t) is "-0.50", the sign replacement unit 45 generates (5, 1) as the code (N1, N2).

[0028] The output unit 46 outputs the code (N1, N2) replaced by the code replacement unit 45 to the outdoor unit control device 50 via a signal line (not shown). As a result, the data output from the indoor unit control device 40 of each indoor unit 3 every unit time t becomes the code (N1, N2) consisting of integer numerical values. Furthermore, the output unit 46 outputs the value of the set temperature Ts set in the indoor unit 3 to the outdoor unit control device 50. The set temperature Ts set in the indoor unit 3 is generally in increments of 0.5°C or 1°C, etc., and the amount of data is small. Furthermore, when an energy saving level (Lv1 to Lv4) is set in the indoor unit 3, the output unit 46 outputs the set level (Lv1 to Lv4) to the outdoor unit control device 50.

[0029] (Configuration of outdoor unit control device) The outdoor unit control device 50 can be configured using a computer such as a microcomputer, a CPU (Central Processing Unit), and hardware such as peripheral circuits and devices of the computer. In this embodiment, the outdoor unit control device 50 is configured by a control board equipped with a microcomputer. The outdoor unit control device 50 controls the operation of the compressor 21 of the outdoor unit 2 according to the capacity required by the multiple indoor units 3. As shown in FIG. 4, the outdoor unit control device 50 includes an acquisition unit 51, a setting unit 52, a compressor control unit 53, and a storage unit 54 as a functional configuration configured by a combination of hardware and software such as a program executed by the computer.

[0030] The acquisition unit 51 acquires the code (N1, N2) replaced by the code replacement unit 45, which is output from the indoor unit control device 40 of each indoor unit 3, and the value of the set temperature Ts set in each indoor unit 3. Acquisition of the code (N1, N2) and the value of the set temperature Ts is repeatedly performed for each unit time t. Furthermore, when an energy saving level (Lv1 to Lv4) is set, the acquisition unit 51 acquires the set setting level (Lv1 to Lv4). In addition, the acquisition unit 51 acquires the outdoor temperature Ta detected by the outdoor temperature sensor 25 and the pressure of the heat medium in the compressor 21 detected by the pressure sensor 27 .

[0031] The setting unit 52 sets a target pressure saturation temperature ST for adjusting the output of the compressor 21. Immediately after the air conditioning system 1 is started up, the setting unit 52 first sets an initial target pressure saturation temperature ST0, and then sets the target pressure saturation temperature ST while successively correcting the initial target pressure saturation temperature ST0. To set the initial target pressure saturation temperature ST0, the setting unit 52 first obtains a pressure saturation temperature corresponding to the outdoor temperature detected by the outdoor temperature sensor 25 as a reference pressure saturation temperature ST1. Correlation information indicating the correlation between the outdoor temperature Ta and the reference pressure saturation temperature is stored in the storage unit 54. Fig. 5 is an example of correlation information D1 indicating the correlation between the outdoor temperature Ta and the reference pressure saturation temperature during cooling operation. The setting unit 52 refers to the correlation information D1 as shown in Fig. 5 stored in the storage unit 54, and acquires the reference pressure saturation temperature ST1 corresponding to the outdoor temperature Ta at that time. Here, the reference pressure saturation temperature ST1 corresponding to the outdoor temperature Ta is set to a temperature T1 higher than a temperature T2 described later when the outdoor temperature Ta is in a temperature range where people can be comfortable, such as 17 to 23°C. Also, when the outdoor temperature Ta is, for example, 23°C or higher and in a temperature range where people feel hot, the reference pressure saturation temperature ST1 gradually decreases from the temperature T1 as the outdoor temperature Ta increases, and is set to a temperature T2 lower than the temperature T1 when the outdoor temperature Ta is, for example, 42°C or higher.

[0032] The setting unit 52 calculates an initial target pressure saturation temperature ST0 based on the reference pressure saturation temperature ST1 thus set, for example, based on the following formula (3). Initial target pressure saturation temperature ST0 = (Standard pressure saturation temperature ST1 - Lower limit of target pressure saturation temperature Tmin) / 2 + Set temperature correction value Th1 + Eco level correction value Th2 … (3)

[0033] Here, in the above formula (3), the lower limit value Tmin of the target pressure saturation temperature may be, for example, the temperature T2 of the lowest reference pressure saturation temperature ST1 in the correlation information D1 of Fig. 5. In this embodiment, in the first term of the above formula (3), the setting unit 52 adjusts the initial target pressure saturation temperature ST0 based on the reference pressure saturation temperature ST1 and a preset lower limit value of the pressure saturation temperature. In this embodiment, the setting unit 52 adjusts the initial target pressure saturation temperature ST0 to be lower than the reference pressure saturation temperature ST1 determined according to the outdoor temperature Ta by taking the average of the reference pressure saturation temperature ST1 and the lower limit value Tmin of the target pressure saturation temperature. Here, if control is started with the reference pressure saturation temperature ST1 as the initial value when the indoor load of the indoor unit 3 is high, it takes time to reach the originally required capacity, and the start-up time is delayed. On the other hand, if control is started from the lower limit value Tmin of the target pressure saturation temperature at which the capacity is high, even if the indoor load of the indoor unit 3 is low and energy-saving operation is possible, operation will start with excessive output. Then, there is not enough time to correct the target pressure saturation temperature ST, and the heat exchanger 33 of the indoor unit 3 is likely to fall into an operation in which intermittent ON / OFF is repeated. In response to this, as described above, by taking the average of the reference pressure saturation temperature ST1 and the lower limit value Tmin of the target pressure saturation temperature, it is possible to reach the target pressure saturation temperature at which stable operation is achieved near the final set temperature more quickly. In addition, in order to adjust the initial target pressure saturation temperature ST0 to be lower than the reference pressure saturation temperature ST1, the setting unit 52 may use a method other than the average of the reference pressure saturation temperature ST1 and the lower limit value Tmin of the target pressure saturation temperature. For example, a preset constant may be subtracted from the reference pressure saturation temperature ST1.

[0034] In the above formula (3), the set temperature correction value Th1 corrects the initial target pressure saturation temperature ST0 based on the set temperature of each of the multiple indoor units 3 acquired by the acquisition unit 51 of the multiple indoor units 3. The setting unit 52 adjusts the initial target pressure saturation temperature ST0 based on the set temperature with the highest degree of capacity requirement among the set temperatures of each of the multiple indoor units 3 acquired by the acquisition unit 51. In other words, the indoor unit 3 with the largest difference between the outdoor temperature Ta and the set temperature Ts of the multiple indoor units 3 has the highest required capacity for the outdoor unit 2. The setting unit 52 identifies the set temperature Ts with the largest difference from the outdoor temperature Ta among the set temperatures Ts of the multiple indoor units 3.

[0035] The setting unit 52 determines the set temperature correction value Th1, for example, by the following equation (4), and applies it to the above equation (3). Set temperature correction value Th1 = specified set temperature Ts - constant K ... (4) Here, the constant K can be set, for example, to K = 24. For example, if the lowest set temperature Ts among the multiple indoor units 3 is Ts = 20°C, then based on the above formula (4), the set temperature correction value Th1 = 20 - 24 = -4°C.

[0036] In the above formula (3), the eco level correction Th2 is expressed as the energy saving level during operation in each of the multiple indoor units 3, as follows: Lv1: Eco Mode Low Lv2: Eco Mode Medium Lv3: Eco Mode High Lv4: Eco Mode Super High When any one of the above is set, a correction is made according to the set energy saving level.

[0037] Here, the setting unit 52 adjusts the initial target pressure saturation temperature ST0 based on the energy-saving level which places the greatest degree of capacity demand on the outdoor unit 2, among the energy-saving level settings (Lv1 to Lv4) for each of the multiple indoor units 3 acquired by the acquisition unit 51. Specifically, the energy-saving levels are in the order of Lv1 to Lv4, in which the capacity demand on the outdoor unit 2 decreases. For this reason, the setting unit 52 identifies the lowest energy-saving level among the energy-saving levels set in the multiple indoor units 3.

[0038] The setting unit 52 obtains a correction value of the eco level correction Th2 according to the identified lowest energy saving level. For this reason, the energy saving level and the correction value of the eco level correction Th2 are stored in the storage unit 54 in association with each other. for example, Lv1: Eco mode Low, Eco level correction Th2 = 15°C Lv2: In the case of Eco Mode Medium, Eco Level Correction Th2 = 10℃ Lv3: Eco mode High, Eco level correction Th2=5℃ Lv4: Eco mode Super High, Eco level correction Th2=0℃ It is set as follows.

[0039] In this way, the setting unit 52 calculates the initial target pressure saturation temperature ST0 based on the above formula (3), and then, every time unit time t elapses, sets a new target pressure saturation temperature based on the temperature difference E(t) between the set temperature Ts and the indoor temperature Tr and the amount of change in the temperature difference per unit time ΔE(t), which are output from the indoor unit control device 40. To do this, the setting unit 52 corrects the previously set target pressure saturation temperature with a correction value ΔST using the following formula (5). Target pressure saturation temperature ST(t)= Previously set target pressure saturation temperature ST(t-1) + gain value Kp × correction value ΔST … (5) Here, when the target pressure saturation temperature ST(t) is set immediately after setting the initial target pressure saturation temperature ST0, the previously set target pressure saturation temperature ST(t-1) is the initial target pressure saturation temperature ST0.

[0040] The gain value Kp in the above formula (5) is set appropriately within the range of, for example, 0.5 to 2.0. The correction value ΔST is set based on the temperature difference E(t) and the amount of change in the temperature difference per unit time ΔE(t), which are output every unit time t. In this embodiment, in the indoor unit control device 40, the temperature difference E(t) and the code (N1, N2) corresponding to the amount of change ΔE(t) are output from the indoor unit control device 40 of each indoor unit 3. The setting unit 52 acquires the correction value ΔST based on the acquired code (N1, N2). For this reason, the memory unit 54 stores map information M2, as shown in FIG. 6, in which the code (N1, N2) received by the acquisition unit 51 is associated with a correction value ΔST of the target pressure saturation temperature that is pre-associated with the code (N1, N2). The setting unit 52 refers to the map information M2 in the storage unit 54, and acquires the correction value ΔST corresponding to the acquired code (N1, N2). For example, when (5, 1) is acquired as the code (N1, N2), the setting unit 52 acquires the correction value ΔST=−3.80. The setting unit 52 applies the acquired correction value ΔST to the above formula (5) to set a new target pressure saturation temperature ST(t). The setting unit 52 sets the target pressure saturation temperature ST(t) using the above formula (5) every time a unit time t elapses.

[0041] Here, the setting unit 52 checks whether the target pressure saturation temperature ST(t) set by the above formula (5) is within a range of a lower limit value Tmin or more and an upper limit value Tmax or less of a preset target pressure saturation temperature. When the target pressure saturation temperature ST(t) is less than the lower limit value Tmin, the setting unit 52 sets the target pressure saturation temperature ST(t) to the lower limit value Tmin. When the target pressure saturation temperature ST(t) exceeds the upper limit value Tmax, the setting unit 52 sets the target pressure saturation temperature ST(t) to the upper limit value Tmax. Here, the upper limit value Tmax may be a constant value set in advance, or, for example, as shown in FIG. 7, multiple upper limit values ​​Tmax1 to Tmax4 may be set according to the energy saving levels Lv1 to Lv4.

[0042] The setting unit 52 outputs the target pressure saturation temperature ST(t) thus set for each unit time t to the compressor control unit 53. The compressor control unit 53 operates the compressor 21 at a rotation speed according to the output target pressure saturation temperature.

[0043] (Procedure for controlling air conditioning systems) As shown in FIG. 8, the indoor unit control device 40 of each indoor unit 3 acquires information on the indoor temperature detected by the indoor temperature sensor 31 and the humidity detected by the humidity sensor 32 (step S11).

[0044] When the calculation unit 44 detects the indoor temperature Tr for the second time or later, it calculates the temperature difference E(t) between the set temperature Ts of the indoor unit 3 and the indoor temperature Tr detected by the indoor temperature sensor 31, and the amount of change ΔE(t) of the temperature difference E(t) per unit time t using the above equations (1) and (2) (step S12).

[0045] Next, the sign replacement unit 45 replaces the numerical values ​​of the temperature difference E(t) and the amount of change ΔE(t) calculated by the calculation unit 44 with signs consisting of integers that are pre-associated with each other based on the sign replacement map M1 as shown in FIG. 3 (step S13). The output unit 46 outputs the code (N1, N2) replaced by the code replacement unit 45 to the outdoor unit control device 50 (step S14).

[0046] On the other hand, as shown in FIG. 9, in the outdoor unit control device 50, immediately after the air conditioning system 1 is started up, first, an initial target pressure saturation temperature ST0 is set (step S21). To achieve this, the setting unit 52 acquires the outdoor temperature Ta detected by the outdoor temperature sensor 25, and by referring to correlation information D1 as shown in FIG. 5, acquires the reference pressure saturation temperature ST1 corresponding to the outdoor temperature Ta at that time. Then, the setting unit 52 calculates the initial target pressure saturation temperature ST0 based on the reference pressure saturation temperature ST1 and on the above formula (3). To do this, the setting unit 52 acquires the set temperature correction value Th1 using the above formula (4) based on the set temperatures of the multiple indoor units 3 acquired by the acquisition unit 51 of the multiple indoor units 3. Furthermore, the setting unit 52 acquires a correction value according to the energy saving level set for each of the multiple indoor units 3.

[0047] After setting the initial target pressure saturation temperature ST0, the setting unit 52 acquires information based on the temperature difference E(t) between the set temperature Ts and the indoor temperature Tr and the amount of change in the temperature difference per unit time ΔE(t), which are output from the indoor unit control device 40 every unit time t (step S22). In this embodiment, in step S22, the temperature difference E(t) and codes (N1, N2) corresponding to the amount of change ΔE(t) are acquired from the indoor unit control device 40 of each indoor unit 3.

[0048] Then, the setting unit 52 sets the target pressure saturation temperature by the above formula (5) (step S23). Here, the correction value ΔST for correcting the previously set target pressure saturation temperature ST(t-1) is obtained by referring to map information M2 as shown in Fig. 6 based on the code (N1, N2) obtained in step S22. The setting unit 52 applies the acquired correction value ΔST to the above equation (5) to set a new target pressure saturation temperature ST(t).

[0049] Next, the setting unit 52 outputs the set target pressure saturation temperature ST(t) to the compressor control unit 53, and the compressor control unit 53 operates the compressor 21 at a rotation speed according to the output target pressure saturation temperature (step S24).

[0050] (Action and effect) According to the air conditioning system 1, the control method for the air conditioning system 1, and the program configured as above, The target pressure saturation temperature is set based on the initial target pressure saturation temperature of the heat medium in the compressor 21, the temperature difference between the set temperature set in the indoor unit control device 40 and the indoor temperature detected by the indoor temperature sensor 31, and the amount of change in the temperature difference per unit time. As a result, the set target pressure saturation temperature can be the initial target pressure saturation temperature adjusted according to the temperature difference between the set temperature and the indoor temperature in the multiple indoor units 3, that is, the required capacity of each indoor unit 3. Furthermore, by setting the target pressure saturation temperature taking into account the amount of change per unit time of the temperature difference between the set temperature and the indoor temperature, the target pressure saturation temperature can be adjusted sequentially according to the required capacity of each indoor unit 3. As a result, for example, when the difference between the set temperature and the indoor temperature is small and the required capacity of the indoor unit 3 is small, the target pressure saturation temperature can be set according to that, and excessive increase in the output of the compressor 21 of the outdoor unit 2 can be avoided. Also, for example, when there is a large difference between the set temperature and the indoor temperature, by setting a target pressure saturation temperature accordingly, it is possible to increase the output of the compressor 21 of the outdoor unit 2 according to the capacity required by the multiple indoor units 3. In this way, by adjusting the output of the compressor 21 of the outdoor unit 2 according to the capacity required by the indoor units 3, it is possible to reduce the need for the heat exchange in the heat exchanger 33 on the indoor unit 3 side to be repeatedly turned on and off intermittently. Therefore, it is possible to improve the operating efficiency of the air conditioning system 1 while performing more finely tuned temperature adjustment in the indoor units 3.

[0051] In addition, by setting the target pressure saturation temperature for each unit of time based on the amount of change per unit of time in the temperature difference between the set temperature and the room temperature, the target pressure saturation temperature can be adjusted in closer to real time according to the required capacity of each indoor unit 3.

[0052] Furthermore, by setting the initial target pressure saturation temperature based on the reference pressure saturation temperature corresponding to the outdoor temperature, the output of the compressor 21 of the outdoor unit 2 can be made to correspond to the outdoor temperature from the initial stage. This makes it possible to reduce the deviation of the output of the compressor 21 of the outdoor unit 2 from the capacity required by the indoor unit 3. This reduces the need for the heat exchanger 33 on the indoor unit 3 side to be intermittently turned on and off repeatedly. As a result, the operating efficiency of the air conditioning system 1 can be improved while the temperature in the indoor unit 3 is adjusted more precisely.

[0053] Furthermore, by adjusting the initial target pressure saturation temperature based on the acquired reference pressure saturation temperature and at least one of the preset upper limit and lower limit, it is possible to reduce the deviation of the output of the compressor 21 of the outdoor unit 2 from the required capacity from the indoor unit 3 from the initial stage.

[0054] By adjusting the initial target pressure saturation temperature based on the set temperature in each of the multiple indoor units 3, it is possible to grasp the required capacity of each indoor unit 3 from the set temperature in the indoor units 3. Therefore, the initial target pressure saturation temperature can be adjusted according to the required capacity of each indoor unit 3.

[0055] Moreover, by adjusting the initial target pressure saturation temperature based on the set temperature among the respective set temperatures in the multiple indoor units 3 that has the greatest degree of capacity demand, the output of the outdoor unit 2 can be adjusted neither excessively nor insufficiently.

[0056] In addition, by adjusting the initial target pressure saturation temperature based on the level of energy-saving operation, it is possible to reduce, from the initial stage, the deviation of the output of the compressor 21 of the outdoor unit 2 from the capacity required by the indoor unit 3 according to the level of energy-saving operation.

[0057] Incidentally, when multiple indoor units 3 are provided for the outdoor unit 2, if the indoor unit control devices 40 of the multiple indoor units 3 transmit the set temperature, the indoor temperature, the temperature difference between the set temperature and the indoor temperature, and the change amount of the temperature difference per unit time to the outdoor unit control device 50 as is, the amount of transmitted data becomes huge. For example, the more indoor units 3 connected to the outdoor unit 2, the greater the amount of transmitted data. For example, when the indoor temperature is repeatedly detected every unit time, the more frequently the detection is performed and the shorter the unit time, the greater the amount of transmitted data. For example, the more decimal places of the set temperature and the indoor temperature are increased to improve accuracy, the greater the amount of transmitted data. In this way, when the amount of transmitted data from the indoor unit control device 40 to the outdoor unit control device 50 increases, the processing load on the outdoor unit control device 50 increases, and problems such as processing taking time occur. In response to this, the amount of data transmitted can be reduced by replacing the temperature difference and the numerical value of the amount of change calculated by the calculation unit 44 with a code consisting of an integer associated in advance and outputting it to the outdoor unit control device 50. As a result, the processing load on the indoor unit control device 40 is reduced, and the time required for processing can be reduced.

[0058] Furthermore, since the correction value of the target pressure saturation temperature associated with the code received by the acquisition unit 51 can be acquired based on map information in which the code received by the acquisition unit 51 is associated with a correction value of the target pressure saturation temperature that is previously associated with the code, a new target pressure saturation temperature can be set efficiently. Moreover, by rewriting the map information on the outdoor unit control device 50 side, the correction value of the target pressure saturation temperature corresponding to the code received by the acquisition unit 51 can also be easily changed.

[0059] In the above embodiment, the case where the cooling operation is performed has been described, but similar control can also be performed when the heating operation is performed. In this case, to obtain the reference pressure saturation temperature, for example, correlation information D2 indicating the correlation between the outdoor temperature Ta and the reference pressure saturation temperature during heating operation is used, as shown in Fig. 10. In this case, for example, when the outdoor temperature is 12°C or higher, the reference pressure saturation temperature is set to T11. As the outdoor temperature drops below 12°C, the reference pressure saturation temperature is gradually increased, and when the outdoor temperature is below -10°C, the reference pressure saturation temperature is set to a temperature T12 higher than T11. In addition, as for the upper limit value when setting the target pressure saturation temperature ST by the setting unit 52, for example, as shown in FIG. 11, if the outdoor temperature Ta is -15°C or higher, the upper limit value may be set to an upper limit value Tmax11, and if the outdoor temperature Ta becomes less than -15°C, the upper limit value may be gradually decreased, and if the outdoor temperature is equal to or lower than Ta-25°C, the upper limit value may be set to an upper limit value Tmax12 which is smaller than the upper limit value Tmax11.

[0060] (Other embodiments) Although the embodiments of the present disclosure have been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like that do not depart from the gist of the present disclosure are also included. In the above embodiment, the temperature difference E(t) between the set temperature and the indoor temperature and the amount of change in the temperature difference ΔE(t) are calculated by the indoor unit control device 40, but these calculations may also be performed by the outdoor unit control device 50.

[0061] In addition, a program for realizing all or part of the functions of the indoor unit control device 40 and the outdoor unit control device 50 may be recorded in a computer-readable recording medium, and the program recorded in the recording medium may be read into a computer system and executed to perform processing by each functional unit. The term "computer system" as used herein includes hardware such as an OS and peripheral devices. In addition, if a WWW system is used, the term "computer system" also includes a homepage providing environment (or display environment). In addition, the term "computer-readable recording medium" refers to a portable medium such as a CD, DVD, or USB, and a storage device such as a hard disk built into a computer system. In addition, when the program is distributed to the indoor unit control device 40 and the outdoor unit control device 50 via a communication line, the indoor unit control device 40 and the outdoor unit control device 50 that have received the program may expand the program in the storage 64 and execute the above processing. In addition, the above program may be for realizing part of the above-mentioned functions, and may further be capable of realizing the above-mentioned functions in combination with a program already recorded in the computer system.

[0062] <Additional Notes> The air conditioning system 1, the control method for the air conditioning system 1, and the program described in the embodiment can be understood, for example, as follows.

[0063] (1) An air conditioning system 1 according to a first aspect includes an outdoor unit 2 having a compressor 21 that compresses a heat medium, a plurality of indoor units 3 that are connected to the outdoor unit 2 via a medium circuit through which the heat medium circulates and have a heat exchanger 33 that exchanges heat between the heat medium supplied from the compressor 21 via the medium circuit and the indoor air, an indoor temperature sensor 31 that detects the indoor temperature of the room in which each of the plurality of indoor units 3 is installed, an outdoor unit control device 50 that controls the operation of the outdoor unit 2, and an indoor unit control device 40 that is provided in each of the plurality of indoor units 3 and controls the operation of the indoor units 3 in accordance with a set temperature that is set from the outside, and the outdoor unit control device 50 includes at least a setting unit 52 that sets a target pressure saturation temperature for adjusting the output of the compressor 21 based on a preset initial target pressure saturation temperature of the heat medium in the compressor 21, a temperature difference between the set temperature set in the indoor unit control device 40 and the indoor temperature detected by the indoor temperature sensor 31, and an amount of change in the temperature difference per unit time.

[0064] This air conditioning system 1 sets the target pressure saturation temperature based on the initial target pressure saturation temperature of the heat medium in the compressor 21, the temperature difference between the set temperature set in the indoor unit control device 40 and the indoor temperature detected by the indoor temperature sensor 31, and the amount of change in the temperature difference per unit time. As a result, the set target pressure saturation temperature can be the initial target pressure saturation temperature adjusted according to the temperature difference between the set temperature and the indoor temperature in the multiple indoor units 3, that is, the required capacity of each indoor unit 3. Furthermore, by setting the target pressure saturation temperature taking into account the amount of change per unit time of the temperature difference between the set temperature and the indoor temperature, the target pressure saturation temperature can be adjusted sequentially according to the required capacity of each indoor unit 3. As a result, for example, when the difference between the set temperature and the indoor temperature is small and the required capacity of the indoor unit 3 is small, the target pressure saturation temperature can be set according to that, and excessive increase in the output of the compressor 21 of the outdoor unit 2 can be avoided. Also, for example, when there is a large difference between the set temperature and the indoor temperature, by setting a target pressure saturation temperature accordingly, it is possible to increase the output of the compressor 21 of the outdoor unit 2 according to the capacity required by the multiple indoor units 3. In this way, by adjusting the output of the compressor 21 of the outdoor unit 2 according to the capacity required by the indoor units 3, it is possible to reduce the need for the heat exchange in the heat exchanger 33 on the indoor unit 3 side to be repeatedly turned on and off intermittently. Therefore, it is possible to improve the operating efficiency of the air conditioning system 1 while performing more finely tuned temperature adjustment in the indoor units 3.

[0065] (2) An air conditioning system 1 according to a second aspect is the air conditioning system 1 of (1), wherein the setting unit 52 sets the target pressure saturation temperature each time a unit time elapses based on the amount of change per unit time in the temperature difference between the set temperature set in the indoor unit control device 40 and the indoor temperature detected by the indoor temperature sensor 31.

[0066] This allows the target pressure saturation temperature to be set each unit time based on the amount of change per unit time in the temperature difference between the set temperature and the room temperature, thereby making it possible to adjust the target pressure saturation temperature in accordance with the required capacity of each indoor unit 3 in a state closer to real time.

[0067] (3) An air conditioning system 1 according to a third aspect is the air conditioning system 1 of (1) or (2), further comprising an outdoor temperature sensor 25 for detecting the outdoor temperature where the outdoor unit 2 is installed, and the setting unit 52 acquires a pressure saturation temperature corresponding to the outdoor temperature detected by the outdoor temperature sensor 25 as a reference pressure saturation temperature based on predetermined correlation information indicating a correlation between the outdoor temperature and a reference pressure saturation temperature, and sets the initial target pressure saturation temperature based on the acquired reference pressure saturation temperature.

[0068] Thus, by setting the initial target pressure saturation temperature based on the reference pressure saturation temperature corresponding to the outdoor temperature, the output of the compressor 21 of the outdoor unit 2 can be made to correspond to the outdoor temperature from the initial stage. This makes it possible to reduce the deviation of the output of the compressor 21 of the outdoor unit 2 from the capacity required by the indoor unit 3 side. This reduces the need for the heat exchange in the heat exchanger 33 on the indoor unit 3 side to be repeatedly turned on and off intermittently. As a result, the operating efficiency of the air conditioning system 1 can be improved while the temperature in the indoor unit 3 is adjusted more finely.

[0069] (4) The air conditioning system 1 according to a fourth aspect is the air conditioning system 1 of (3), wherein the setting unit 52 adjusts the initial target pressure saturation temperature based on the acquired reference pressure saturation temperature and at least one of an upper limit value and a lower limit value of a pressure saturation temperature that is set in advance.

[0070] As a result, by adjusting the initial target pressure saturation temperature based on the acquired reference pressure saturation temperature and at least one of the preset upper and lower limits, it is possible to reduce the deviation of the output of the compressor 21 of the outdoor unit 2 from the required capacity from the indoor unit 3 from the initial stage.

[0071] (5) The air conditioning system 1 according to a fifth aspect is the air conditioning system 1 of (3) or (4), further comprising an acquisition unit 51 that acquires the set temperature in the indoor unit 3, and the setting unit 52 adjusts the initial target pressure saturation temperature based on the set temperature in each of the multiple indoor units 3 acquired by the acquisition unit 51.

[0072] As a result, the required capacity of each indoor unit 3 can be grasped from the set temperature of the indoor units 3, and the initial target pressure saturation temperature can be adjusted according to the required capacity of each indoor unit 3.

[0073] (6) The air conditioning system 1 according to a sixth aspect is any one of the air conditioning systems 1 of (3) to (5), wherein the setting unit 52 adjusts the initial target pressure saturation temperature based on the set temperature having the greatest degree of capacity requirement among the set temperatures for each of the multiple indoor units 3 acquired by the acquisition unit 51.

[0074] Thereby, by adjusting the initial target pressure saturation temperature based on the set temperature among the respective set temperatures in the plurality of indoor units 3 that has the greatest degree of capacity requirement, the output of the outdoor unit 2 can be adjusted neither excessively nor insufficiently.

[0075] (7) An air conditioning system 1 according to a seventh aspect is any one of the air conditioning systems 1 of (3) to (6), wherein the indoor unit control device 40 controls the operation of the indoor unit 3 in accordance with an energy-saving operation level set from the outside, and the setting unit 52 adjusts the initial target pressure saturation temperature based on the energy-saving operation level set in the indoor unit control device 40.

[0076] As a result, by adjusting the initial target pressure saturation temperature based on the level of energy-saving operation, it is possible to reduce, from the initial stage, the deviation of the output of the compressor 21 of the outdoor unit 2 from the capacity required by the indoor unit 3 according to the level of energy-saving operation.

[0077] (8) An air conditioning system 1 according to an eighth aspect is an air conditioning system 1 according to any one of (1) to (7), wherein the indoor unit control device 40 includes at least a calculation unit 44 that calculates the temperature difference between the set temperature set in the indoor unit control device 40 and the indoor temperature detected by the indoor temperature sensor 31, and the amount of change in the temperature difference per unit time, a code replacement unit 45 that replaces the numerical values ​​of the temperature difference and the amount of change calculated by the calculation unit 44 with codes consisting of integers that are pre-associated, and an output unit 46 that outputs the codes replaced by the code replacement unit 45 to the outdoor unit control device 50, wherein the outdoor unit control device 50 includes an acquisition unit 51 that acquires the codes output from the output unit 46, and the setting unit 52 sets a target pressure saturation temperature based on the codes received by the acquisition unit 51.

[0078] This makes it possible to reduce the amount of data transmitted by replacing the temperature difference and the numerical value of the amount of change calculated by the calculation unit 44 with a code consisting of an integer associated in advance and outputting it to the outdoor unit control device 50. As a result, the processing load on the indoor unit control device 40 is reduced, and the time required for processing can be reduced.

[0079] (9) An air conditioning system 1 according to a ninth aspect is the air conditioning system 1 of (8), wherein the outdoor unit control device 50 further includes a memory unit 54 that stores map information in which the code received by the acquisition unit 51 is associated with a correction value of the target pressure saturation temperature that has been previously associated with the code, and the setting unit 52 acquires the correction value of the target pressure saturation temperature associated with the code received by the acquisition unit 51 based on the map information, and sets a new target pressure saturation temperature by correcting the target pressure saturation temperature previously set with the correction value of the target pressure saturation temperature.

[0080] As a result, it is possible to acquire the correction value of the target pressure saturation temperature associated with the code received by the acquisition unit 51 based on map information in which the code received by the acquisition unit 51 is associated with a correction value of the target pressure saturation temperature that is previously associated with the code, and therefore it is possible to efficiently set a new target pressure saturation temperature. Also, by rewriting the map information on the outdoor unit control device 50 side, it is also possible to easily change the correction value of the target pressure saturation temperature that corresponds to the code received by the acquisition unit 51.

[0081] (10) A control method for an air conditioning system 1 according to a tenth aspect acquires the temperature difference between the indoor temperature of a room in which each of a plurality of indoor units 3 is installed and the set temperature of the indoor unit 3, and the amount of change per unit time of the temperature difference between the indoor temperature and the set temperature, and sets a target pressure saturation temperature for adjusting the output of the compressor 21 of the outdoor unit 2 based on a preset initial target pressure saturation temperature of the heat medium in the compressor 21, the temperature difference between the set temperature and the indoor temperature, and the amount of change per unit time of the temperature difference.

[0082] In this control method for the air conditioning system 1, the target pressure saturation temperature is set based on a preset initial target pressure saturation temperature of the heat medium in the compressor 21, the temperature difference between the set temperature and the room temperature of the indoor unit 3, and the amount of change in the temperature difference per unit time. As a result, the set target pressure saturation temperature can be the initial target pressure saturation temperature adjusted according to the temperature difference between the set temperature and the room temperature in the multiple indoor units 3, that is, the required capacity of each indoor unit 3. Furthermore, by setting the target pressure saturation temperature taking into account the amount of change per unit time of the temperature difference between the set temperature and the room temperature, the target pressure saturation temperature can be adjusted sequentially according to the required capacity of each indoor unit 3. As a result, the output of the compressor 21 of the outdoor unit 2 can be adjusted according to the required capacity from the indoor unit 3 side, and the need to perform heat exchange in the heat exchanger 33 on the indoor unit 3 side while repeatedly turning it on and off intermittently can be reduced. Therefore, the operating efficiency of the air conditioning system 1 can be improved while performing temperature adjustment in the indoor unit 3 more finely.

[0083] (11) A program according to an eleventh aspect causes a computer of an air conditioning system 1 to execute a process of acquiring the temperature difference between the indoor temperature of a room in which each of a plurality of indoor units 3 is installed and the set temperature of the indoor unit 3, and the amount of change per unit time of the temperature difference between the indoor temperature and the set temperature, and setting a target pressure saturation temperature for adjusting the output of the compressor 21 of the outdoor unit 2, based on a preset initial target pressure saturation temperature of the heat medium in the compressor 21, the temperature difference between the set temperature and the indoor temperature, and the amount of change per unit time of the temperature difference.

[0084] This program sets the target pressure saturation temperature based on the initial target pressure saturation temperature of the heat medium in the compressor 21, the temperature difference between the set temperature and the room temperature of the indoor unit 3, and the amount of change in the temperature difference per unit time. As a result, the set target pressure saturation temperature can be the initial target pressure saturation temperature adjusted according to the temperature difference between the set temperature and the room temperature in the multiple indoor units 3, that is, the required capacity of each indoor unit 3. Furthermore, by setting the target pressure saturation temperature taking into account the amount of change per unit time of the temperature difference between the set temperature and the room temperature, the target pressure saturation temperature can be adjusted sequentially according to the required capacity of each indoor unit 3. As a result, the output of the compressor 21 of the outdoor unit 2 can be adjusted according to the required capacity from the indoor unit 3 side, and the need to perform heat exchange in the heat exchanger 33 on the indoor unit 3 side while repeatedly turning it on and off intermittently can be reduced. Therefore, the operating efficiency of the air conditioning system 1 can be improved while performing temperature adjustment in the indoor unit 3 more finely. [Explanation of symbols]

[0085] 1. Air conditioning system 2…Outdoor unit 3…Indoor unit 5…Connecting piping 21...Compressor 23...Outdoor unit 25...Outdoor temperature sensor 27...Pressure sensor 27a…Suction side sensor 27b…Discharge side sensor 31…Indoor temperature sensor 32...Humidity sensor 33...Heat exchanger 33…Evaporator 38…Remote controller 40...Indoor unit control device 41…Information acquisition department 42...External input reception section 43...Operation control unit 44...Arithmetic section 45...Sign replacement part 46...Output section 47...Code storage unit 50...Outdoor unit control device 51…Acquisition part 52…Settings section 53...Compressor control section 54...Storage section 64…Storage D1…Correlation information D2…Correlation information M1…sign permutation map M2…Map information

Claims

1. an outdoor unit having a compressor for compressing a heat medium; a plurality of indoor units each including a heat exchanger connected to the outdoor unit via a medium circuit through which a heat medium flows and performing heat exchange between the heat medium supplied from the compressor via the medium circuit and indoor air; an indoor temperature detection unit that detects the indoor temperature of a room in which each of the indoor units is installed; An outdoor unit control device that controls the operation of the outdoor unit; an indoor unit control device provided in each of the indoor units and controlling the operation of the indoor units in response to a set temperature that is set from outside; The outdoor unit control device includes at least a preset initial target pressure saturation temperature of the heat medium in the compressor; A temperature difference between the set temperature set in the indoor unit control device and the indoor temperature detected by the indoor temperature detection unit; and the amount of change in the temperature difference per unit time, a setting unit that sets a target pressure saturation temperature for adjusting the output of the compressor based on the target pressure saturation temperature; (c) an air conditioning system;

2. The setting unit is Based on the amount of change per unit time of the temperature difference between the set temperature set in the indoor unit control device and the indoor temperature detected by the indoor temperature detection unit, setting the target pressure saturation temperature every time the unit time elapses; The air conditioning system of claim 1 .

3. An outdoor temperature detection unit that detects the outdoor temperature where the outdoor unit is installed, The setting unit is acquiring, as a reference pressure saturation temperature, a pressure saturation temperature corresponding to the outdoor temperature detected by the outdoor temperature detection unit based on correlation information indicating a correlation between a preset outdoor temperature and a reference pressure saturation temperature; setting the initial target pressure saturation temperature based on the acquired reference pressure saturation temperature; 3. An air conditioning system according to claim 1 or 2.

4. The setting unit is adjusting the initial target pressure saturation temperature based on the acquired reference pressure saturation temperature and at least one of a preset upper limit value and a preset lower limit value of the pressure saturation temperature; 4. The air conditioning system according to claim 3.

5. An acquisition unit that acquires a set temperature of the indoor unit is further provided, The setting unit is Based on the set temperatures of the indoor units acquired by the acquisition unit, Adjusting the initial target pressure saturation temperature; 4. The air conditioning system according to claim 3.

6. The setting unit is Based on the set temperature of the indoor units having the greatest degree of capacity requirement among the set temperatures of the indoor units acquired by the acquisition unit, Adjusting the initial target pressure saturation temperature; 6. The air conditioning system according to claim 5.

7. The indoor unit control device controls the operation of the indoor unit according to an energy saving operation level set externally, The setting unit adjusts the initial target pressure saturation temperature based on the level of the energy saving operation set in the indoor unit control device.

4. The air conditioning system according to claim 3.

8. The indoor unit control device is A calculation unit that calculates at least a temperature difference between the set temperature set in the indoor unit control device and the indoor temperature detected by the indoor temperature detection unit, and an amount of change in the temperature difference per unit time; a code replacement unit that replaces the temperature difference and the change amount calculated by the calculation unit with codes consisting of integers that are associated with each other in advance; an output unit that outputs the code replaced by the code replacement unit to the outdoor unit control device, The outdoor unit control device is an acquisition unit that acquires the code output from the output unit, The setting unit sets a target pressure saturation temperature based on the code received by the acquisition unit.

3. An air conditioning system according to claim 1 or 2.

9. The outdoor unit control device is A storage unit that stores map information in which the code received by the acquisition unit is associated with a correction value of the target pressure saturation temperature that is associated in advance with the code, The setting unit is Acquire a correction value of the target pressure saturation temperature associated with the code received by the acquisition unit based on the map information; The previously set target pressure saturation temperature is corrected with the correction value of the target pressure saturation temperature to set a new target pressure saturation temperature. The air conditioning system according to claim 8.

10. A temperature difference between an indoor temperature of a room in which each of a plurality of indoor units is installed and a set temperature of the indoor unit, and an amount of change per unit time of the temperature difference between the indoor temperature and the set temperature are obtained; setting a target pressure saturation temperature for adjusting the output of the compressor of the outdoor unit based on a preset initial target pressure saturation temperature of the heat medium in the compressor, a temperature difference between the preset temperature and the indoor temperature, and an amount of change in the temperature difference per unit time; A method for controlling an air conditioning system.

11. A temperature difference between an indoor temperature of a room in which each of a plurality of indoor units is installed and a set temperature of the indoor unit, and an amount of change per unit time of the temperature difference between the indoor temperature and the set temperature are obtained; setting a target pressure saturation temperature for adjusting the output of the compressor of the outdoor unit based on a preset initial target pressure saturation temperature of the heat medium in the compressor, a temperature difference between the preset temperature and the indoor temperature, and an amount of change in the temperature difference per unit time; The processing is executed by a computer of the air conditioning system. program.

Images