Room temperature control method, room temperature control device, program, and room temperature control system provided therewith

Abstract

The present invention enables effective suppression of condensation in a room under circumstances where condensation in the room is likely to occur.　This room temperature control method is for controlling the room temperature in a building comprising a room and an air conditioning device having an air cooling function for lowering the room temperature in the room, the method comprising: determining whether circumstances are likely to result in indoor condensation on the basis of an outdoor dew-point temperature of the building and a set temperature that was set for the air conditioning device in order to adjust the room temperature; determining, if the circumstances were determined to be likely to result in the indoor condensation, whether the ease of taking outside air into the room, as determined by the structure of the building, is greater than a preset intake threshold value; if the ease of taking in outside air is greater than the intake threshold value, setting an additional temperature that should be added to the set temperature and modifying the set temperature to a temperature obtained by adding the additional temperature to the set temperature as a new set temperature; and running the air conditioning device on the basis of the new set temperature.

Description

Room temperature control method, room temperature control device, program, and room temperature control system equipped therewith

[0001] The present invention relates to a method for controlling the room temperature of a building equipped with an air conditioning system, a room temperature control device, a program, and a room temperature control system equipped therewith.

[0002] Conventionally, for example, an air conditioner described in Patent Document 1 is known. The air conditioner described in Patent Document 1 comprises an indoor unit equipped with a control device and an outdoor unit. The ventilation operation control program stored in the control device calculates the dew point temperature based on the temperature and humidity of the outdoor air, and then compares the dew point temperature with the temperature of the indoor air.

[0003] In the air conditioner described in Patent Document 1, if the dew point temperature of the outdoor air is higher than the indoor air temperature plus a predetermined temperature during cooling operation, the operation of the ventilation means for taking in humid outdoor air that is prone to condensation is restricted so as not to activate. Patent Document 1 states that this prevents the problem of water vapor contained in the outdoor air condensing on the indoor piping portion of the ventilation pipe and the inside of the exhaust fan.

[0004] However, the air conditioner described in Patent Document 1 restricts the intake of outside air when the dew point temperature outdoors is a predetermined temperature higher than the indoor temperature, but it does not regulate the indoor temperature. Therefore, in the case of a poorly airtight building, outside air may be unintentionally drawn into the room, or even in the case of a highly airtight building, if the indoor temperature drops to a set temperature set by the occupants after the operation of the ventilation means is restricted, for example, condensation may occur indoors.

[0005] Japanese Patent Publication No. 2005-265401

[0006] The object of the present invention is to provide a room temperature control method, a room temperature control device, a program, and a room temperature control system equipped therewith that can effectively suppress condensation in a room under conditions where condensation is likely to occur indoors.

[0007] To solve the above problems, a room temperature control method according to one aspect of the present invention is a room temperature control method for a building having a room and an air conditioning system having a cooling function for lowering the room temperature, wherein it is determined whether conditions are likely to occur indoors based on the dew point temperature outside the building and the set temperature set in the air conditioning system to adjust the room temperature, and if it is determined that conditions are likely to occur indoors, it is determined whether the ease with which outside air can be taken into the room, which is determined by the building's structure, is greater than a preset intake threshold, and if the ease with which outside air can be taken in is greater than the intake threshold, an additional temperature to be added to the set temperature is set, the temperature obtained by adding the additional temperature to the set temperature is changed to a new set temperature, and the air conditioning system is operated based on the new set temperature.

[0008] A room temperature control device according to another aspect of the present invention is a room temperature control device for controlling an air conditioning device having a cooling function for lowering the room temperature in a building, and comprises: a determination unit that determines whether conditions are likely to occur indoors based on the dew point temperature outside the building and a set temperature set in the air conditioning device to adjust the room temperature, and if it is determined that conditions are likely to occur indoors, determines whether the ease with which outside air can be taken into the room, which is determined by the building's configuration, is greater than a preset intake threshold; a temperature setting unit that sets an additional temperature to be added to the set temperature and changes the temperature obtained by adding the additional temperature to the set temperature to change the set temperature to a new set temperature; and an output unit that outputs a command to operate the air conditioning device based on the new set temperature.

[0009] A program relating to another aspect of the present invention is a program implemented in a room temperature control device that controls an air conditioning device having a cooling function for lowering the room temperature in a building, the program comprising: a determination unit that determines whether conditions are likely to occur indoors based on the dew point temperature outside the building and a set temperature set in the air conditioning device to adjust the room temperature, and if it is determined that conditions are likely to occur indoors, determines whether the ease with which outside air can be taken into the room, determined by the building's configuration, is greater than a preset intake threshold; if the determination unit determines that the ease with which outside air can be taken into the room is greater than the intake threshold, sets an additional temperature to be added to the set temperature and changes the temperature obtained by adding the additional temperature to the set temperature to change the set temperature to a new set temperature; and an output unit that outputs a command to operate the air conditioning device based on the new set temperature, thereby causing the room temperature control device to function.

[0010] Another aspect of the present invention relates to a room temperature control system installed in a building having rooms, comprising: an air conditioning device having a cooling function for lowering the room temperature; and a room temperature control device for controlling the air conditioning device.

[0011] Another aspect of the present invention provides a room temperature control system installed in a building having rooms, comprising: an air conditioning device having a cooling function for lowering the room temperature; and a room temperature control device for controlling the air conditioning device, wherein the air conditioning device has a reheat dehumidification function.

[0012] According to the present invention, condensation can be effectively suppressed indoors in situations where there is a high probability of condensation occurring.

[0013] This is a schematic front view showing a building having a room temperature control system according to the embodiment. This is a block diagram showing the electrical configuration of the room temperature control system according to the embodiment. This is a flowchart showing the processes performed by the room temperature control device according to the embodiment. This is a flowchart showing the "set temperature adjustment process" performed by the room temperature control device according to the embodiment. This is a flowchart showing the "comfort adjustment process" performed by the room temperature control device according to the embodiment. This is a timing chart showing the changes in dew point temperature and set temperature.

[0014] Embodiments of the present invention will be described below with reference to the attached drawings. Note that the following embodiments are examples that embody the present invention and are not intended to limit the technical scope of the present invention.

[0015] An example of a room temperature control system will be described with reference to Figures 1 and 2. Figure 1 is a schematic front view showing a building having the room temperature control system according to the embodiment. Figure 2 is a block diagram showing the electrical configuration of the room temperature control system according to the embodiment. As shown in Figures 1 and 2, the room temperature control system includes an air conditioning device 1, a room temperature control device 15 that can communicate with the air conditioning device 1 via a communication network or the like, a room temperature detector 14a, an indoor relative humidity detector 14b, and a ventilation device 23.

[0016] The air conditioning unit 1 and the ventilation unit 23 are installed in a room S within a building partitioned by side walls 51 and a roof 50 on a foundation 52. A resident lives in room S. In the following description, the air present inside room S is referred to as "indoor air," and the air present outside room S is referred to as "outdoor air." Furthermore, in this embodiment, the temperature of the outdoor air TT is equal to the temperature of the indoor air AI. ＡＩ The scenario assumes a hot and humid summer condition with even higher temperatures and a high relative humidity (HH) in the outside air.

[0017] The air conditioning unit 1 adjusts the temperature of the indoor air AI present in the room S. Preferably, the air conditioning unit 1 also adjusts the humidity of the indoor air AI present in the room S. In this embodiment, the air conditioning unit 1 adjusts the room temperature T within the room S. ＡＩ The cooling function is used to lower the humidity H inside the room. ＡＩIt has a dehumidification function to lower the humidity. Preferably, the dehumidification function includes a reheat dehumidification function, which will be described later. In the reheat dehumidification function, a second set humidity Hb is set, which is lower than the first set humidity Ha set in the cooling function.

[0018] Specifically, the air conditioning system 1 comprises an indoor unit 10 and an outdoor unit 20. The indoor unit 10 is installed on the side wall 51 inside the room S. The indoor unit 10 comprises a first indoor heat exchanger (not shown), a second indoor heat exchanger (not shown), an indoor fan (not shown), and a housing 17 having an intake port 17a and an outlet port 17b. The first indoor heat exchanger, the second indoor heat exchanger, and the indoor fan are housed in the housing 17. The intake port 17a and the outlet port 17b are in communication, and the first indoor heat exchanger and the second indoor heat exchanger are arranged between the intake port 17a and the outlet port 17b. The air conditioning system 1 circulates indoor air AI within the room S. Specifically, indoor air AI is drawn into the housing 17 from inside the room S via the intake port 17a. Furthermore, the air AO is blown out from inside the housing 17 towards the room S via the air outlet 17b.

[0019] The outdoor unit 20 is located outside the room S. The outdoor unit 20 comprises a housing 27, a compressor (not shown) for compressing the refrigerant, an outdoor heat exchanger (not shown), an outdoor fan (not shown), and an on-off valve (not shown). The compressor, outdoor heat exchanger, outdoor fan, and on-off valve are housed in the housing 27. The first indoor heat exchanger, the second indoor heat exchanger, the compressor, the outdoor heat exchanger, and the on-off valve are connected by refrigerant piping 41, forming a refrigerant circuit. The refrigerant sealed in the refrigerant circuit is not particularly limited, but for example, an HFC (hydrofluoric acid carbon) refrigerant such as R32 or R410A may be used. The on-off valve is positioned so that when "reheat dehumidification operation" is performed, the on-off valve opens, allowing refrigerant to flow to the second indoor heat exchanger, and when "reheat dehumidification operation" is not performed, the on-off valve closes, preventing refrigerant from flowing to the second indoor heat exchanger.

[0020] The room temperature detector 14a detects the temperature T of the indoor air AI present in the room S. ＡＩ The room temperature detector 14a measures the temperature T of the indoor air AI drawn into the intake port 17a from inside the room S.ＡＩ It is provided near the intake port 17a so as to measure ＡＩ . The room temperature detector 14a is provided near the intake port 17a, but is not particularly limited. From the viewpoint of accurately measuring the temperature T of the indoor air AI ＡＩ it is preferably separated from the air outlet 17b and the ventilation device 23.

[0021] The indoor relative humidity detector 14b measures the humidity H of the indoor air AI present in the room S ＡＩ It measures the humidity H of the indoor air AI sucked from the room S into the intake port 17a. The indoor relative humidity detector 14b is provided near the intake port 17a, but is not particularly limited. From the viewpoint of accurately measuring the humidity H of the indoor air AI ＡＩ it is provided near the intake port 17a so as to measure ＡＩ . The indoor relative humidity detector 14b is provided near the intake port 17a, but is not particularly limited. From the viewpoint of accurately measuring the humidity H of the indoor air AI ＡＩ it is preferably separated from the air outlet 17b and the ventilation device 23.

[0022] The ventilation device 23 includes an intake fan 21a and an exhaust fan 21b. The intake fan 21a supplies outside air into the room S by rotating. The exhaust fan 21b exhausts the indoor air AI from the room S by rotating. In the ventilation device 23, the method in which both the intake fan 21a and the exhaust fan 21b are driven is called the first type of ventilation, the method in which only the intake fan 21a is driven is called the second type of ventilation, and the method in which only the exhaust fan 21b is driven is called the third type of ventilation.

[0023] By the way, in a building having the room S, depending on the configuration of the building, the ease of taking in outside air (airtight performance) into the room S determined by the configuration of the building is determined. As the ease of taking in outside air into the room S determined by the configuration of the building, for example, the C value (equivalent gap area) can be mentioned. The C value indicates a numerical value showing "how much gap GG there is in the house". Specifically, the C value is calculated by the total area of the gaps GG formed between the inside and outside of the room S ÷ the floor area of the building. That is, the smaller the C value, the higher the airtight building.

[0024] In this embodiment, the C value of a building containing room S is determined by the building contractor or the like and stored in the storage unit 158 ​​of the room temperature control device 15, which will be described later. In addition, the storage unit 158 ​​of the room temperature control device 15 stores whether the ventilation system 23 of the building containing room S is of type 1 ventilation, type 2 ventilation, or type 3 ventilation.

[0025] Next, the configuration of the room temperature control system for acquiring the properties of the outside air present outside the room S will be described. In this embodiment, the room temperature control system further includes an outside temperature detector 16 and a relative humidity detector 19.

[0026] The outdoor temperature detector 16 measures the temperature TT of the outside air outside the room S. The relative humidity detector 19 measures the humidity HH of the outside air outside the room S. The outdoor temperature detector 16 and the relative humidity detector 19 are installed on the outdoor unit 20. The outdoor temperature detector 16 and the relative humidity detector 19 output information to the room temperature control device 15.

[0027] Next, with reference to Figure 2, the room temperature control device 15 will be described. The room temperature control device 15 is composed of a CPU (central processing unit) and storage means (RAM: Random Access Memory and / or ROM: Read Only Memory), etc. Specifically, the room temperature control device 15 may be composed of an information terminal such as a PC (personal computer), tablet, or smartphone. The room temperature control device 15 is configured so that residents in the room S can input predetermined information such as operation details through an operation panel installed on the side wall 51, etc.

[0028] The air conditioner 1 operates based on the information indicating the operation content set by the occupant. The operation content includes "cooling operation" and "reheat dehumidification operation". In the "cooling operation", the on-off valve is closed, the first indoor heat exchanger acts as an evaporator, and the outdoor heat exchanger acts as a condenser. Specifically, in the "cooling operation", the refrigerant circulates in the order of the compressor, the outdoor heat exchanger, and the first indoor heat exchanger. On the other hand, in the "reheat dehumidification operation", after the outside air is dehumidified and cooled by the first indoor heat exchanger, the dehumidified and cooled outside air is reheated by the second indoor heat exchanger and sent into the room. Specifically, in the "reheat dehumidification operation", the on-off valve is opened, the first indoor heat exchanger acts as an evaporator, the second indoor heat exchanger acts as a reheater, and the outdoor heat exchanger acts as a condenser. And in the "reheat dehumidification operation", the refrigerant circulates in the order of the compressor, the outdoor heat exchanger, and the first indoor heat exchanger, and at the same time, the refrigerant circulates in the order of the outdoor heat exchanger and the second indoor heat exchanger without passing through the compressor.

[0029] Specifically, when performing the "cooling operation", the air conditioner 1 controls the indoor unit 10 and the outdoor unit 20 based on the cooling set temperature TS set by the occupant and the temperature T of the indoor air AI measured by the room temperature detector 14 ＡＩ to adjust the temperature T ＡＩ . More specifically, in the "cooling operation", the blowing temperature T blown out from the air outlet 17b into the room S is adjusted by changing the rotation speed of the compressor or the like ＡＯ . Also, since the indoor air AI is cooled to the blowing temperature T in the first indoor heat exchanger ＡＯ , the water vapor contained in the indoor air AI condenses and dew forms on the outer surface of the first indoor heat exchanger. Therefore, water vapor is removed from the indoor air AI, and the humidity H of the indoor air AI ＡＩ decreases to the first set humidity Ha.

[0030] On the other hand, when performing the "reheat dehumidification operation", the air conditioner 1 controls the indoor unit 10 and the outdoor unit 20 based on the cooling set temperature TS set by the occupant and the temperature T of the indoor air AI measured by the room temperature detector 14 ＡＩ to control the temperature T ＡＩ and the humidity H ＡＩAdjust the above. More specifically, in the "reheat dehumidification operation", first, the cooling capacity is adjusted so that the indoor air AI is cooled to a predetermined temperature TH lower than the cooling set temperature TS. As a result, the water vapor contained in the indoor air AI condenses and dew forms on the outer surface of the first indoor heat exchanger. The humidity H of the indoor air AI ＡＩ decreases to a second set humidity Hb lower than the first set humidity Ha. Then, the air cooled to the predetermined temperature TH lower than the cooling set temperature TS is reheated to a blow-out temperature T higher than the predetermined temperature TH by the second indoor heat exchanger ＡＯ up to.

[0031] By the way, as described above, outside air is taken into the room S through the execution of ventilation or the gap GG. During the "cooling operation", when the outside air taken into the room S touches the indoor air AI at the cooling set temperature TS, if the temperature of the outside air is cooled to below the dew point temperature TP, the water vapor contained in the outside air condenses and dew forms. In the present embodiment, in order to suppress the dew formation of the water vapor derived from the outside air, the cooling capacity of the air conditioner 1 is adjusted by the room temperature control device 15 not at the cooling set temperature TS set by the occupant but according to the dew point temperature TP of the outside air.

[0032] Specifically, the room temperature control device 15 includes a calculation unit 152, a determination unit 151, a temperature setting unit 153, a humidity setting unit 154, a timer 156, an output unit 157, and a storage unit 158.

[0033] The storage unit 158 is composed of an arbitrary recording medium such as an HDD (hard disk drive), an SSD (solid state drive), or a semiconductor memory. The storage unit 158 pre-records a program and basic information. The program is installed in the room temperature control device 15 that controls the air conditioner 1. The program may be stored in a computer-readable recording medium such as a CD-ROM and provided to the occupant. Also, the program may be stored in a server on the Internet. In this case, the user may operate the room temperature control device 15 to install the program from the server into the storage unit 158.

[0034] The memory unit 158 ​​pre-stores, as basic information indicating airtightness, the C value of a building having room S and an intake threshold CT for determining whether the building having room S is a "highly airtight building" or a "lowly airtight building". The intake threshold CT is set to, for example, "2.0". In other words, if the C value is greater than "2.0", it is considered a "lowly airtight building", and if the C value is "2.0" or less, it is considered a "highly airtight building". In this embodiment, the C value is greater than "2.0", so the building according to this embodiment is a "lowly airtight building".

[0035] Furthermore, the memory unit 158 ​​stores, as basic information indicating airtightness, whether the ventilation system 23 of the building having the room S is a first-class ventilation system, a second-class ventilation system, or a third-class ventilation system. In this embodiment, the ventilation system 23 is a system in which only the exhaust fan 22 is driven, and is a "third-class ventilation system".

[0036] The calculation unit 152 calculates the dew point temperature TP of the outside air based on the outside air temperature TT measured by the outside air temperature detector 16 and the outside air humidity HH measured by the relative humidity detector 19.

[0037] The determination unit 151 determines whether conditions are likely to cause indoor condensation based on the dew point temperature TP calculated by the calculation unit 152 and the cooling set temperature TS. Specifically, the determination unit 151 determines that conditions are likely to cause indoor condensation if the dew point temperature TP of the outside air is equal to or greater than the cooling set temperature TS. In other words, the determination unit 151 determines that when outside air with a dew point temperature TP equal to or greater than the cooling set temperature TS comes into contact with indoor air AI at the cooling set temperature TS, the temperature of the outside air is cooled to the dew point temperature TP, causing the water vapor contained in the outside air to condense and form condensation. On the other hand, the determination unit 151 determines that conditions are unlikely to cause indoor condensation if the dew point temperature TP is less than the cooling set temperature TS. In other words, the determination unit 151 determines that when outside air with a dew point temperature TP below the cooling set temperature TS comes into contact with indoor air AI at the cooling set temperature TS, the water vapor contained in the outside air will not condense even if the temperature of the outside air is cooled to the cooling set temperature TS.

[0038] Furthermore, if the determination unit 151 determines that conditions are likely to cause indoor condensation, it determines whether the ease with which outside air can be taken into the room is greater than the intake threshold CT. Specifically, the determination unit 151 determines whether the C value is greater than the intake threshold CT. If the C value is greater than the intake threshold CT, the determination unit 151 determines that outside air is taken into the room S. On the other hand, if the C value is less than or equal to the intake threshold CT, the determination unit 151 determines that almost no outside air is taken into the room S.

[0039] The temperature setting unit 153, when the determination unit 151 determines that the C value is greater than the intake threshold CT, sets an additional temperature Tα to be added to the cooling set temperature TS, and changes the setting temperature to a new set temperature TS' which is the cooling set temperature TS with the additional temperature Tα added. In other words, when the temperature of the outside air taken into the room S reaches the cooling set temperature TS, the water vapor contained in the outside air condenses and condenses, so the temperature setting unit 153 changes the set temperature from the cooling set temperature TS to a new set temperature TS'. Specifically, the new set temperature TS' is set to be the dew point temperature TP. As a result, even if a relatively large amount of outside air is taken into the room S for ventilation, the temperature inside the room S T ＡＩ Since the temperature does not fall below the dew point temperature TP, condensation of water vapor from the outside air can be suppressed.

[0040] On the other hand, if the determination unit 151 determines that the C value is below the intake threshold CT, the temperature setting unit 153 sets the new set temperature TS' to be below the dew point temperature TP. In other words, although it is determined that conditions are likely to cause indoor condensation, since almost no outside air is taken into the room S, the temperature setting unit 153 changes the set temperature from the cooling set temperature TS to the new set temperature TS'. Specifically, the new set temperature TS' is set to be TP - 1°C. As a result, since the amount of outside air taken into the room S for ventilation is small, it is possible to suppress the condensation of water vapor originating from the outside air.

[0041] Furthermore, the temperature setting unit 153 may determine whether the ventilation system 23 of the building containing the room S is "Type 1 ventilation" when the determination unit 151 determines that the C value is below the intake threshold CT. Specifically, if the ventilation system 23 of the building containing the room S is not "Type 1 ventilation", the new set temperature TS' is set to the dew point temperature TP. As a result, even if outside air is taken into the room S, the temperature of the outside air will not fall below the dew point temperature TP, thus suppressing the condensation of water vapor contained in the outside air. On the other hand, if the ventilation system 23 of the building containing the room S is "Type 1 ventilation", the new set temperature TS' is set to the dew point temperature TP - 1°C. As a result, since the amount of outside air taken into the room S for ventilation is small, it is possible to suppress the condensation of water vapor originating from the outside air.

[0042] The output unit 157 outputs a command to operate the air conditioner 1 based on the set temperature TS' changed by the temperature setting unit 153. Specifically, the room temperature T ＡＩ The output unit 157 outputs a signal such that the value becomes one of the following: "cooling setting temperature TS", "dew point temperature TP", or "dew point temperature TP - 1°C".

[0043] As explained above, according to this embodiment, when it is determined that conditions are likely to cause indoor condensation and that outside air can be easily taken into the room S, the set temperature of the air conditioner 1 can be changed to a new set temperature TS' which is higher than the cooling set temperature TS by an additional temperature Tα. As a result, even when the dew point temperature TP of the outside air is relatively high, the room temperature Tα can be raised to the new set temperature TS'. ＡＩ By lowering the temperature, indoor condensation can be effectively suppressed.

[0044] In detail, if the ease of taking in outside air is greater than the intake threshold CT, raising the new set temperature TS' to the dew point temperature TP can reliably prevent indoor condensation. Also, if the amount of outside air taken into the room for ventilation is small and the possibility of indoor condensation is relatively low, keeping the new set temperature TS' below the dew point temperature TP can achieve both condensation suppression and comfort from cooling.

[0045] Referring again to Figure 2, the configuration of the room temperature control system for improving occupant comfort will be described in detail. The room temperature control system further includes a notification unit 18. The room temperature control device 15 further includes a humidity setting unit 154.

[0046] The memory unit 158 ​​further records the upper and lower limits of the comfortable temperature range as basic information indicating the comfortable temperature. The upper limit Tx of the comfortable temperature range is the room temperature T when an occupant located in the room S is located in the room S. ＡＩ This indicates a threshold for determining whether a certain temperature is uncomfortable. The upper limit Tx of the comfortable temperature range is not particularly limited, but is, for example, 28°C.

[0047] The determination unit 151 determines, when the cooling setting temperature TS of the air conditioning unit 1 is changed to a new setting temperature TS', whether the new setting temperature TS' exceeds the upper limit Tx of the comfortable temperature range, which is set in advance as the temperature range that residents find comfortable.

[0048] If the temperature setting unit 153 determines that the new set temperature TS' exceeds the upper limit Tx of the comfortable temperature range, it lowers the new set temperature TS' to a temperature TS'' that corresponds to the upper limit Tx of the comfortable temperature range.

[0049] The humidity setting unit 154 determines that the new set temperature TS' exceeds the upper limit Tx of the comfortable temperature range, and then sets the humidity H of the room S. ＡＩ To adjust this, the first set humidity Ha set in the air conditioning unit 1 is lowered. In other words, the room temperature T ＡＩ By lowering the humidity level and removing water vapor from the indoor air AI to a new second set humidity level Hb using the air conditioning device 1, it is possible to suppress the occurrence of indoor condensation while maintaining comfort.

[0050] The output unit 157 outputs a command to operate the air conditioner 1 based on the set temperature TS'' and second set humidity Hb changed by the temperature setting unit 153 and humidity setting unit 154. Specifically, when the new set temperature TS'' is lowered to a temperature TS'' corresponding to the upper limit Tx of the comfortable temperature range, the output unit 157 outputs a command to the air conditioner 1 to perform "reheat dehumidification operation".

[0051] Furthermore, the notification unit 18 notifies the occupant that there is a possibility of indoor condensation occurring if the newly set temperature TS' is lowered to a temperature TS'' corresponding to the upper limit Tx of the comfortable temperature range. The notification unit 18 is, for example, a speaker that conveys predetermined information audibly, or a display device that conveys predetermined information visually. Room temperature T ＡＩ Since this will result in lowering the temperature below the new set temperature TS', even if the air conditioning system 1 removes water vapor from the indoor air AI to the new second set humidity Hb, indoor condensation may still occur as a result of prioritizing the comfort of the residents. By informing the residents of this in advance, it is possible to encourage them to decide whether to prioritize comfort or the prevention of indoor condensation. In other words, it is possible to give the residents an opportunity to change the set temperature TS''.

[0052] Next, I will explain the reference temperature TB. The reference temperature TB indicates the temperature that residents normally set as the cooling setting temperature TS when they perform "cooling operation". The reference temperature TB is stored in the memory unit 158.

[0053] If the determination unit 151 determines that conditions are not likely to cause indoor condensation, and the reference temperature TB is lower than the cooling set temperature TS and higher than the dew point temperature TP, the new set temperature TS' may be set to become the reference temperature TB. In other words, room temperature T ＡＩ Even when the reference temperature TB is reached, the temperature of the outside air taken into the room S for ventilation does not fall below the dew point temperature TP. As a result, condensation of water vapor from the outside air can be suppressed. On the other hand, the determination unit 151 maintains the new set temperature TS' if the reference temperature TB is either above the cooling set temperature TS or below the dew point temperature TP.

[0054] The output unit 157 outputs a command to operate the air conditioner 1 based on the set temperature TS' changed by the temperature setting unit 153. Specifically, the room temperature T ＡＩ The output unit 157 outputs a signal such that the value becomes one of the following: "cooling setting temperature TS", "dew point temperature TP", "dew point temperature TP - 1°C", or "reference temperature TB".

[0055] Next, with reference to Figure 3, the room temperature control method executed by the room temperature control device 15 according to this embodiment will be described in detail. Figure 3 is a flowchart of the process executed by the room temperature control device 15. As shown in Figure 3, the room temperature control method comprises steps S101 to S106.

[0056] As described above, the storage unit 158 ​​pre-stores the C value of the building containing the room S and the intake threshold CT as basic information indicating airtightness performance. The storage unit 158 ​​also pre-stores whether the ventilation system 23 of the building containing the room S is of type 1 ventilation, type 2 ventilation, or type 3 ventilation, as basic information indicating airtightness performance. Furthermore, the storage unit 158 ​​pre-records the upper limit Tx of the comfortable temperature range as basic information indicating the comfortable temperature. In addition, the storage unit 158 ​​pre-records the reference temperature TB included in the basic information. In step S101, the room temperature control device 15 acquires (reads) the above basic information from the storage unit 158.

[0057] In step S102, the timer 156 starts measuring the elapsed time.

[0058] In step S103, the outside air temperature TT is measured by the outside air temperature detector 16, and the relative humidity HH of the outside air is measured by the relative humidity detector 19.

[0059] In step S104, the calculation unit 152 calculates the dew point temperature TP of the outside air based on the outside air temperature TT measured by the outside air temperature detector 16 and the outside air humidity HH measured by the relative humidity detector 19.

[0060] In step S105, the room temperature control device 15 obtains predetermined information (cooling set temperature TS), such as the operating details entered by the resident, from the air conditioning unit 1.

[0061] In step S106, having completed steps S101 to S105, the room temperature control device 15 obtains the dew point temperature TP and the cooling set temperature TS, and then executes the "set temperature adjustment process" shown in Figure 4.

[0062] Next, with reference to Figure 4, the "set temperature adjustment process" performed by the room temperature control device 15 according to this embodiment will be described in detail. Figure 4 is a flowchart of the "set temperature adjustment process" performed by the room temperature control device 15. As shown in Figure 4, the "set temperature adjustment process" comprises steps S201 to S212.

[0063] In step S201, the determination unit 151 determines whether the dew point temperature TP is equal to or greater than the cooling set temperature TS. If it is determined that the dew point temperature TP is equal to or greater than the cooling set temperature TS, the process proceeds to step S202.

[0064] In step S202, the determination unit 151 determines whether the C value is less than or equal to the intake threshold "2.0". If it is determined that the C value is not less than or equal to the intake threshold "2.0", the process proceeds to step S203. In step S203, the temperature setting unit 153 sets the new set temperature TS' to be the dew point temperature TP. As a result, even if a large amount of outside air is taken into the room S for ventilation, the temperature of the outside air will not fall below the dew point temperature TP, thus suppressing the condensation of water vapor from the outside air.

[0065] On the other hand, if it is determined in step S202 that the C value is less than or equal to the intake threshold "2.0", the process proceeds to step S204. In step S204, the temperature setting unit 153 determines whether the ventilation system 23 of the building having the room S is of the "Type 1 ventilation" type.

[0066] If it is determined that the ventilation system 23 of the building containing room S is not "Type 1 ventilation," the process proceeds to step S203 described above. On the other hand, if it is determined that the ventilation system 23 of the building containing room S is "Type 1 ventilation," the process proceeds to step S205. In step S205, the temperature setting unit 153 sets the new set temperature TS' to the dew point temperature TP - 1°C. As described above, if it is determined in step 202 that the C value is less than or equal to the intake threshold "2.0," and in step S203 it is determined that it is "Type 1 ventilation," the amount of outside air taken into room S for ventilation is small. Therefore, there is less water vapor from the outside air inside room S, and condensation of this water vapor can be suppressed.

[0067] After step S203 or step S205 is completed, the room temperature control device 15 determines a new set temperature TS', and then in step S206, it performs the "comfort adjustment process" shown in Figure 5.

[0068] On the other hand, if in step S201 it is determined that the dew point temperature TP is not equal to or greater than the cooling set temperature TS, that is, that the conditions are not such that indoor condensation is likely to occur, the process proceeds to step S207. In step S207, the determination unit 151 determines whether or not the reference temperature TB is equal to or greater than the cooling set temperature TS. If it is determined that the reference temperature TB is not equal to or greater than the cooling set temperature TS, the process proceeds to step S208. In step S208, the cooling set temperature TS is maintained.

[0069] On the other hand, if it is determined that the reference temperature TB is equal to or greater than the cooling set temperature TS, the process proceeds to step S209. In step S209, the determination unit 151 determines whether or not the reference temperature TB is equal to or less than the dew point temperature TP. If it is determined that the reference temperature TB is equal to or less than the dew point temperature TP, the process proceeds to step S208 described above.

[0070] On the other hand, if it is determined that the reference temperature TB is greater than the dew point temperature TP, the process proceeds to step S210. In step S210, a new set temperature TS' is set to the reference temperature TB. As a result, the room temperature T ＡＩEven when the room temperature reaches the reference temperature TB, the temperature of the outside air brought into the room S for ventilation does not fall below the dew point temperature TP. Therefore, condensation of water vapor from the outside air can be suppressed.

[0071] After step S208 or step S210 is completed, in step S211, the timer 156 determines whether a predetermined time (for example, 1 hour) has elapsed since the start of the elapsed time measurement (step S102). If the room temperature control device 15 determines that the predetermined time has not elapsed since the start of the elapsed time measurement, the process returns to step S207.

[0072] On the other hand, if the timer 156 determines in step S211 that a predetermined time has elapsed since the start of elapsed time measurement, the process proceeds to step S212. In step S212, the elapsed time is reset, and the process returns to step S101.

[0073] Next, referring to Figure 5, we will explain in detail the "comfort adjustment process" for improving the comfort of residents. Figure 5 is a flowchart of the "comfort adjustment process" performed by the air conditioning system. As shown in Figure 5, the "comfort adjustment process" comprises steps S301 to S309.

[0074] In step S301, the determination unit 151 determines whether the new set temperature TS' exceeds the upper limit Tx of the comfort temperature range. If the determination unit 151 determines that the new set temperature TS' exceeds the upper limit Tx of the comfort temperature range, the process proceeds to step S302.

[0075] In step S302, the new set temperature TS' is set to the upper limit Tx of the comfortable temperature range. In other words, if raising the new set temperature TS' to prevent indoor condensation would impair the comfort of the residents, the temperature is lowered from the new set temperature TS' to prioritize the comfort of the residents. After step S302, the process proceeds to step S303.

[0076] In step S303, the humidity setting unit 154 lowers the set humidity Ha set in the air conditioner 1. Specifically, the air conditioner 1 performs "reheat dehumidification operation". After the "reheat dehumidification operation" is performed, the process proceeds to step S304.

[0077] In step S304, the notification unit 18 notifies the resident that there is a possibility of indoor condensation occurring, and the process proceeds to step S305.

[0078] In step S305, the timer 156 determines whether a predetermined time has elapsed since the start of the elapsed time measurement (step S102). If the room temperature control device 15 determines that the predetermined time has not elapsed since the start of the elapsed time measurement, the process returns to step S302.

[0079] On the other hand, if the timer 156 determines in step S305 that a predetermined time has elapsed since the start of elapsed time measurement, the process proceeds to step S306. In step S306, the elapsed time is reset, and the process returns to step S101.

[0080] On the other hand, if the determination unit 151 determines that the upper limit Tx of the comfortable temperature range is equal to or greater than the new set temperature TS', the process proceeds to step S307. In step S307, since the new set temperature TS' is within the comfortable temperature range, the new set temperature TS' is maintained.

[0081] In step S308, the timer 156 determines whether a predetermined time has elapsed since the start of the elapsed time measurement (step S102). If the room temperature control device 15 determines that the predetermined time has not elapsed since the start of the elapsed time measurement, the process returns to step S307.

[0082] On the other hand, if the timer 156 determines in step S308 that a predetermined time has elapsed since the start of elapsed time measurement, the process proceeds to step S309. In step S309, the elapsed time is reset, and the process returns to step S101.

[0083] Next, referring to Figure 6, an example of the operation of the air conditioning system 1 in "cooling mode" will be explained. Figure 6 shows a timing chart illustrating the changes in the dew point temperature TP and the set temperature TS. In Figure 6, the vertical axis represents temperature, and the horizontal axis represents time. The dotted line shows the change in the dew point temperature TP of the outside air. The solid line shows the change in the set temperature TS. The upper limit Tx of the comfortable temperature range is 28°C.

[0084] The dew point temperature TP changes with time t. Specifically, the dew point temperature TP is 22°C at time t0, 26°C at time t1, and 26.5°C at time t2.

[0085] Furthermore, in the building according to this embodiment, the C value is greater than "2.0", and the building according to this embodiment is a "low-airtight building". Also, the ventilation system 23 according to this embodiment is a system in which only the exhaust fan 22 is driven, and is a "Type 3 ventilation" system. The memory unit 158 ​​has in advance stored the above-mentioned reference temperature TB as a basic temperature for adjusting the cooling set temperature TS if, after changing the cooling set temperature TS to a new set temperature TS' by adding an additional temperature Tα to the cooling set temperature TS, the dew point temperature TP becomes lower than the new set temperature TS'. The reference temperature TB is, for example, 25°C. Furthermore, at time t0, it is input that the occupant will perform "cooling operation" with the cooling set temperature TS set to 25°C.

[0086] At time t0, the cooling set temperature TS is 25°C and the dew point temperature TP is 23°C. Therefore, the determination unit 151 determines that the cooling set temperature TS is equal to or greater than the dew point temperature TP, and thus the cooling set temperature TS is maintained.

[0087] At time t1, the cooling set temperature TS is 25°C and the dew point temperature TP is 26°C. Therefore, the determination unit 151 determines that the cooling set temperature TS is less than the dew point temperature TP, and the temperature setting unit 153 sets the new set temperature TS' to be the dew point temperature TP. As a result, the new set temperature TS' becomes 26°C. Thus, even if a large amount of outside air is brought into the room S for ventilation, the temperature of the outside air does not fall below the dew point temperature TP, and condensation of water vapor from the outside air can be suppressed.

[0088] At time t2, the cooling set temperature TS is 26°C and the dew point temperature TP is 26.5°C. Therefore, the determination unit 151 determines that the cooling set temperature TS is less than the dew point temperature TP, and the temperature setting unit 153 sets the new set temperature TS' to be the dew point temperature TP. As a result, the new set temperature TS' becomes 26.5°C. Thus, even if a large amount of outside air is taken into the room S for ventilation, the temperature of the outside air does not fall below the dew point temperature TP, and condensation of water vapor from the outside air can be suppressed.

[0089] At time t3, the cooling set temperature TS is 26.5°C and the dew point temperature TP is 28°C. Therefore, the determination unit 151 determines that the cooling set temperature TS is less than the dew point temperature TP, and the temperature setting unit 153 sets the new set temperature TS' to be the dew point temperature TP. As a result, the new set temperature TS' becomes 28°C. Thus, even if a large amount of outside air is taken into the room S for ventilation, the temperature of the outside air does not fall below the dew point temperature TP, and condensation of water vapor from the outside air can be suppressed.

[0090] At time t4, the cooling set temperature TS is 28°C and the dew point temperature TP is 29°C. Therefore, the determination unit 151 determines that the cooling set temperature TS is less than the dew point temperature TP, and the temperature setting unit 153 sets the new set temperature TS' to be equal to the dew point temperature TP. As a result, the new set temperature TS' becomes 29°C. Subsequently, the determination unit 151 determines that the new set temperature TS' exceeds the upper limit Tx of the comfortable temperature range, and the temperature setting unit 153 sets the new set temperature TS'' to be equal to the upper limit Tx. As a result, the new set temperature TS'' becomes 28°C.

[0091] Since the temperature setting unit 153 has set the new set temperature TS'' to the upper limit Tx, the humidity setting unit 154 lowers the set humidity Ha set in the air conditioner 1. Specifically, the air conditioner 1 performs "reheat dehumidification operation". In other words, room temperature T ＡＩ By lowering the humidity level and removing water vapor from the indoor air AI to a new second set humidity level Hb using the air conditioning device 1, it is possible to suppress the occurrence of indoor condensation while maintaining comfort.

[0092] Furthermore, after changing the cooling setting temperature TS to a new setting temperature TS' by adding an additional temperature Tα, if, as in time ta and tb, the new setting temperature TS' (cooling setting temperature TS) exceeds the dew point temperature TP, and the dew point temperature TP becomes equal to or greater than the reference temperature TB (basic temperature), the temperature setting unit 153 sets the new setting temperature TS' to the reference temperature TB (basic temperature). As a result, the new setting temperature TS' becomes 25°C.

[0093] As explained above, according to this embodiment, when it is determined that conditions are likely to cause indoor condensation and that outside air can be easily taken into the room S, the set temperature of the air conditioner 1 can be changed to a new set temperature TS' which is higher than the cooling set temperature TS by an additional temperature Tα. As a result, even when the dew point temperature TP of the outside air is relatively high, the room temperature Tα can be raised to the new set temperature TS'. ＡＩ By lowering the temperature, indoor condensation can be effectively suppressed.

[0094] Furthermore, the present invention is not limited to the embodiments described above, and for example, the following embodiments may also be adopted.

[0095] In the above embodiment, the calculation unit 152 calculated the dew point temperature TP of the outside air based on the outside air temperature TT measured by the outside air temperature detector 16 and the outside air humidity HH measured by the relative humidity detector 19. However, the communication unit may wirelessly connect to a network N such as the Internet via a public circuit through a base station antenna, which is a fixed piece of equipment, and obtain the dew point temperature TP of the outside air from a server.

[0096] The specific embodiments described above mainly include inventions having the following configurations.

[0097] A room temperature control method according to one aspect of the present invention is a method for controlling the room temperature in a building having a room and an air conditioning system having a cooling function for lowering the room temperature, wherein it is determined whether conditions are likely to occur indoors based on the dew point temperature outside the building and the set temperature set in the air conditioning system to adjust the room temperature, and if it is determined that conditions are likely to occur indoors, it is determined whether the ease with which outside air can be taken into the room, which is determined by the building's structure, is greater than a preset intake threshold, and if the ease with which outside air can be taken in is greater than the intake threshold, an additional temperature to be added to the set temperature is set, the temperature obtained by adding the additional temperature to the set temperature is changed to a new set temperature, and the system is operated based on the new set temperature.

[0098] According to the above air conditioning method, if it is determined that conditions are likely to cause indoor condensation and that outside air can be easily drawn into the room, the set temperature of the air conditioning system can be changed to a new set temperature that is higher than the original set temperature by an additional amount. As a result, even when the dew point temperature of the outside air is relatively high, indoor condensation can be effectively suppressed by lowering the room temperature to the new set temperature.

[0099] In the above-mentioned room temperature control method, it is preferable that when the dew point temperature outside is equal to or higher than the set temperature, it is determined that conditions are likely to occur indoors, and when the ease with which outside air can be taken into the room is greater than the intake threshold, the new set temperature is set to the dew point temperature.

[0100] According to the above air conditioning method, if the ease of taking in outside air is greater than the intake threshold, indoor condensation can be reliably prevented by raising the new set temperature to the dew point temperature.

[0101] In the above-mentioned room temperature control method, it is preferable that when the dew point temperature outside is equal to or higher than the set temperature, it is determined that conditions are likely to occur indoors, and when the ease of taking in outside air into the room is less than or equal to the intake threshold, the new set temperature is set to be less than the dew point temperature.

[0102] According to the above air conditioning method, when the ease of taking in outside air is below the intake threshold, that is, when the possibility of indoor condensation is relatively low, it is possible to achieve both condensation suppression and comfort through cooling by keeping the new set temperature below the dew point temperature.

[0103] In the above-mentioned room temperature control method, when the set temperature of the air conditioner is changed to the new set temperature, it is preferable to determine whether the new set temperature exceeds the upper limit of the comfortable temperature range, which is set in advance as a temperature range that residents find comfortable. If it is determined that the new set temperature exceeds the upper limit of the comfortable temperature range, it is preferable to lower the new set temperature to a temperature corresponding to the upper limit of the comfortable temperature range, and to lower the set humidity set in the air conditioner in order to adjust the humidity of the room, and to operate the air conditioner based on the changed set temperature and set humidity.

[0104] According to the aforementioned air conditioning method, if raising the set temperature to prevent indoor condensation would impair the comfort of the residents, the set temperature can be lowered to prioritize the comfort of the residents, while simultaneously lowering the set humidity to suppress the occurrence of indoor condensation. In other words, by lowering the room temperature and removing water vapor from the indoor air to a new set humidity level using the air conditioning system, it is possible to suppress the occurrence of indoor condensation while maintaining comfort.

[0105] In the above-mentioned room temperature control method, it is preferable to inform the occupants that there is a possibility of indoor condensation occurring when the new set temperature is lowered to a temperature corresponding to the upper limit of the comfortable temperature range.

[0106] According to the aforementioned air conditioning method, in the case of the fourth invention, indoor condensation may occur as a result of prioritizing the comfort of the occupants. However, by informing the occupants in advance of this, it is possible to encourage them to decide whether to prioritize comfort or the prevention of indoor condensation. In other words, it is possible to give the occupants an opportunity to change the set temperature.

[0107] A room temperature control device according to another aspect of the present invention is a room temperature control device for controlling an air conditioning device having a cooling function for lowering the room temperature in a building, and comprises: a determination unit that determines whether conditions are likely to occur indoors based on the dew point temperature outside the building and a set temperature set in the air conditioning device to adjust the room temperature, and if it is determined that conditions are likely to occur indoors, determines whether the ease with which outside air can be taken into the room, which is determined by the building's configuration, is greater than a preset intake threshold; a temperature setting unit that sets an additional temperature to be added to the set temperature and changes the temperature obtained by adding the additional temperature to the set temperature to change the set temperature to a new set temperature; and an output unit that outputs a command to operate the air conditioning device based on the new set temperature.

[0108] According to the aforementioned room temperature control device, if it is determined that conditions are likely to cause indoor condensation and that outside air can be easily drawn into the room, the set temperature of the air conditioner can be changed to a new set temperature that is higher than the original set temperature by an additional amount. As a result, even when the dew point temperature of the outside air is relatively high, indoor condensation can be effectively suppressed by lowering the room temperature to the new set temperature.

[0109] In the room temperature control device, the determination unit preferably determines that indoor condensation is likely to occur when the outdoor dew point temperature is equal to or higher than the set temperature, and the temperature setting unit preferably sets the new set temperature to the dew point temperature when the ease of taking in outside air into the room is greater than the intake threshold.

[0110] According to the aforementioned room temperature control device, if the ease of taking in outside air is greater than the intake threshold, indoor condensation can be reliably prevented by raising the new set temperature to the dew point temperature.

[0111] In the room temperature control device, the determination unit determines that indoor condensation is likely to occur when the dew point temperature outside is equal to or greater than the set temperature, and the temperature setting unit preferably sets the new set temperature to less than the dew point temperature when the ease of taking in outside air into the room is less than or equal to the intake threshold.

[0112] According to the aforementioned room temperature control device, when the ease of taking in outside air is below the intake threshold, that is, when the possibility of indoor condensation is relatively low, it is possible to achieve both condensation suppression and comfort through cooling by keeping the new set temperature below the dew point temperature.

[0113] Preferably, in the room temperature control device, the determination unit determines whether the new set temperature exceeds the upper limit of a comfortable temperature range, which is set in advance as a temperature range that residents find comfortable, when the set temperature of the air conditioner is changed to the new set temperature, and the temperature setting unit lowers the new set temperature to a temperature corresponding to the upper limit of the comfortable temperature range if it is determined that the new set temperature exceeds the upper limit of the comfortable temperature range, and the room temperature control device further includes a humidity setting unit that lowers the set humidity set in the air conditioner to adjust the humidity of the room when it is determined that the new set temperature exceeds the upper limit of the comfortable temperature range, and the output unit outputs a command to operate the air conditioner based on the set temperature and set humidity changed by the temperature setting unit and the humidity setting unit.

[0114] According to the aforementioned room temperature control device, if raising the set temperature to prevent indoor condensation would impair the comfort of the residents, the set temperature can be lowered to prioritize the comfort of the residents, while simultaneously lowering the set humidity to suppress the occurrence of indoor condensation. In other words, by lowering the room temperature and removing water vapor from the indoor air to a new set humidity level using the air conditioning system, it is possible to suppress the occurrence of indoor condensation while maintaining comfort.

[0115] Preferably, the room temperature control device further includes a notification unit that notifies the occupant that there is a possibility of indoor condensation occurring when the newly set temperature is lowered to a temperature corresponding to the upper limit of the comfortable temperature range.

[0116] With the aforementioned room temperature control device, while prioritizing occupant comfort may result in indoor condensation, informing the occupants in advance allows them to decide whether to prioritize comfort or the prevention of indoor condensation. In other words, it gives the occupants an opportunity to change the set temperature.

[0117] A program relating to another aspect of the present invention is a program implemented in a room temperature control device that controls an air conditioning device having a cooling function for lowering the room temperature in a building, the program comprising: a determination unit that determines whether conditions are likely to occur indoors based on the dew point temperature outside the building and a set temperature set in the air conditioning device to adjust the room temperature, and if it is determined that conditions are likely to occur indoors, determines whether the ease with which outside air can be taken into the room, determined by the building's configuration, is greater than a preset intake threshold; if the determination unit determines that the ease with which outside air can be taken into the room is greater than the intake threshold, sets an additional temperature to be added to the set temperature and changes the temperature obtained by adding the additional temperature to the set temperature to change the set temperature to a new set temperature; and an output unit that outputs a command to operate the air conditioning device based on the new set temperature, thereby causing the room temperature control device to function.

[0118] According to the program, if it is determined that conditions are likely to cause indoor condensation and that outside air can be easily drawn into the room, the set temperature of the air conditioner can be changed to a new set temperature that is higher than the original set temperature by an additional amount. As a result, even when the dew point temperature of the outside air is relatively high, indoor condensation can be effectively suppressed by lowering the room temperature to the new set temperature.

[0119] Another aspect of the present invention relates to a room temperature control system installed in a building having rooms, comprising: an air conditioning device having a cooling function for lowering the room temperature; and a room temperature control device for controlling the air conditioning device.

[0120] According to the aforementioned room temperature control system, condensation in the room can be effectively suppressed in situations where condensation is likely to occur.

[0121] Another aspect of the present invention provides a room temperature control system installed in a building having rooms, comprising: an air conditioning device having a cooling function for lowering the room temperature; and a room temperature control device for controlling the air conditioning device, wherein the air conditioning device has a reheat dehumidification function.

[0122] According to the aforementioned room temperature control system, since it has a reheat dehumidification function, it can lower both temperature and humidity.

Claims

1. A method for controlling room temperature in a building having a room and an air conditioning system having a cooling function for lowering the room temperature, comprising: determining whether conditions are likely to cause indoor condensation based on the dew point temperature outside the building and a set temperature set in the air conditioning system to adjust the room temperature; determining whether the ease with which outside air can be taken into the room, determined by the building's structure, is greater than a preset intake threshold if the ease with which outside air can be taken in is greater than the intake threshold, setting an additional temperature to be added to the set temperature, changing the temperature obtained by adding the additional temperature to the set temperature to the set temperature, and operating the air conditioning system based on the new set temperature.

2. The room temperature control method according to claim 1, wherein it is determined that conditions are likely to occur indoors when the outdoor dew point temperature is equal to or higher than the set temperature, and the new set temperature is set to the dew point temperature when the ease of taking in outside air into the room is greater than the intake threshold.

3. The room temperature control method according to claim 1 or 2, wherein it is determined that conditions are likely to occur indoors when the outdoor dew point temperature is above the set temperature, and the new set temperature is set to below the dew point temperature when the ease of taking in outside air into the room is below the intake threshold.

4. When the set temperature of the air conditioner is changed to the new set temperature, it is determined whether the new set temperature exceeds the upper limit of a comfortable temperature range that is set in advance as a temperature range that residents find comfortable; if it is determined that the new set temperature exceeds the upper limit of the comfortable temperature range, the new set temperature is lowered to a temperature corresponding to the upper limit of the comfortable temperature range, and the set humidity set in the air conditioner is lowered in order to adjust the humidity of the room, and the air conditioner is operated based on the changed set temperature and set humidity, the method for controlling room temperature according to any one of claims 1 to 3.

5. The room temperature control method according to claim 4, wherein the occupant is notified that there is a possibility of indoor condensation occurring when the new set temperature is lowered to a temperature corresponding to the upper limit of the comfortable temperature range.

6. A room temperature control device for controlling an air conditioning system having a cooling function for lowering the room temperature in a building, comprising: a determination unit that determines whether conditions are likely to cause indoor condensation based on the dew point temperature outside the building and a set temperature set in the air conditioning system to adjust the room temperature, and if it is determined that conditions are likely to cause indoor condensation, determines whether the ease with which outside air can be taken into the room, determined by the building's structure, is greater than a preset intake threshold; a temperature setting unit that, if the determination unit determines that the ease with which outside air can be taken into the room is greater than the intake threshold, sets an additional temperature to be added to the set temperature and changes the set temperature to the set temperature plus the additional temperature; and an output unit that outputs a command to operate the air conditioning system based on the new set temperature.

7. The room temperature control device according to claim 6, wherein the determination unit determines that conditions are likely to cause indoor condensation when the outdoor dew point temperature is equal to or greater than the set temperature, and the temperature setting unit sets the new set temperature to the dew point temperature when the ease of taking in outside air into the room is greater than the intake threshold.

8. The room temperature control device according to claim 6 or 7, wherein the determination unit determines that conditions are likely to cause indoor condensation when the outdoor dew point temperature is equal to or greater than the set temperature, and the temperature setting unit sets the new set temperature to less than the dew point temperature when the ease of taking in outside air into the room is less than or equal to the intake threshold.

9. The room temperature control device according to any one of claims 6 to 8, wherein the determination unit determines whether, when the set temperature of the air conditioner is changed to the new set temperature, the new set temperature exceeds the upper limit of a comfortable temperature range that is set in advance as a temperature range that residents find comfortable; the temperature setting unit lowers the new set temperature to a temperature corresponding to the upper limit of the comfortable temperature range if it is determined that the new set temperature exceeds the upper limit of the comfortable temperature range; the room temperature control device further comprises a humidity setting unit that lowers the set humidity set on the air conditioner to adjust the humidity of the room if it is determined that the new set temperature exceeds the upper limit of the comfortable temperature range; and the output unit outputs a command to operate the air conditioner based on the set temperature and set humidity changed by the temperature setting unit and the humidity setting unit.

10. The room temperature control device according to claim 9, further comprising a notification unit that notifies the occupant that there is a possibility of indoor condensation occurring when the newly set temperature is lowered to a temperature corresponding to the upper limit of the comfortable temperature range.

11. A program to be implemented in a room temperature control device that controls an air conditioning device having a cooling function for lowering the room temperature in a building, the program comprising: a determination unit that determines whether conditions are likely to occur indoors based on the dew point temperature outside the building and a set temperature set in the air conditioning device to adjust the room temperature, and if it is determined that conditions are likely to occur indoors, determines whether the ease with which outside air can be taken into the room, determined by the building's configuration, is greater than a preset intake threshold; if the determination unit determines that the ease with which outside air can be taken into the room is greater than the intake threshold, sets an additional temperature to be added to the set temperature and changes the temperature obtained by adding the additional temperature to the set temperature to change the set temperature to a new set temperature; and an output unit that outputs a command to operate the air conditioning device based on the new set temperature, thereby causing the room temperature control device to function.

12. A room temperature control system installed in a building having rooms, comprising: an air conditioning device having a cooling function for lowering the room temperature; and a room temperature control device according to any one of claims 6 to 10 for controlling the air conditioning device.

13. A room temperature control system installed in a building having rooms, comprising: an air conditioning device having a cooling function for lowering the room temperature; and a room temperature control device according to claim 9 for controlling the air conditioning device, wherein the air conditioning device has a reheat dehumidification function.

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