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

Abstract

This can suppress a decrease in room temperature during heating operation by an air conditioning system, even in an abnormal state where the heating function is substantially stopped. [Solution] The room temperature control method is a method for controlling the room temperature in a building having a room, an air conditioning system having a heating function for raising the room temperature, and a supply system that heats outside air present outside the room and supplies the outside air into the room, wherein it is determined whether an abnormal condition occurs in which the outlet temperature of the air blown into the room from the air conditioning system is below the room temperature during heating operation by the air conditioning system, and if it is determined that the abnormal condition has occurred, the heating temperature of the outside air supplied into the room by the supply system is determined based on the temperature difference between the room temperature and the outlet temperature of the air at a time set in advance from the time the abnormal condition was determined, and the supply system is operated based on the heating temperature.

Description

[Technical Field]

[0001] The present invention relates to a room temperature control method, a room temperature control device, a program, and a room temperature control system for controlling room temperature. [Background technology]

[0002] Conventionally, an air conditioning system described in Patent Document 1 is known. The air conditioning system described in Patent Document 1 comprises an air conditioner that performs heating operation and a ventilation device that performs ventilation. The ventilation device has an exhaust fan that exhausts indoor air and an intake fan that draws in outside air.

[0003] During heating operation, air conditioners perform two types of operations: temperature control operation to adjust the room temperature, and non-temperature control operation that generates a heating load without the aim of adjusting the room temperature. Non-temperature control operation includes defrost operation (defrosting operation of the outdoor unit). During defrost operation, the air conditioner stops its heating function and effectively operates in cooling mode, causing the room temperature to drop. If ventilation is performed using a ventilation system while the room temperature is dropping, the room will be further cooled by the outside air supplied by the ventilation system, increasing the heating load on the air conditioner after defrost operation.

[0004] Here, in order to suppress the increase in heating load, it is conceivable to stop the operation of the ventilation system during non-temperature-controlled operation (defrost operation). However, if the operation of the ventilation system is uniformly stopped during non-temperature-controlled operation, there is a risk that ventilation will be insufficient. Therefore, in the air conditioning system described in Patent Document 1, the ventilation volume of the ventilation system is reduced during non-temperature-controlled operation so as not to increase the heating load of the air conditioner. Patent Document 1 states that this makes it possible to ensure ventilation opportunities in the room while suppressing an excessive increase in the heating load of the air conditioner after defrost operation. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2014-134343 [Overview of the project] [Problems that the invention aims to solve]

[0006] However, in the air conditioning system described in Patent Document 1, the heating function of the air conditioner is stopped during non-temperature-controlled operation, and the situation remains essentially the same, with cooling operation being performed, which leads to the problem of a decrease in room temperature.

[0007] 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 that can suppress a decrease in room temperature during heating operation by an air conditioning system in an abnormal state in which the heating function is substantially stopped. [Means for solving the problem]

[0008] To solve the above problems, the First Invention provides a method for controlling the room temperature in a building comprising: a room; an air conditioning system having a heating function for raising the room temperature; a ventilation heat exchanger for exchanging heat between outside air present outside the room and indoor air; and a supply device for supplying the outside air to the room while heating it with a refrigerant heat exchanger, wherein the method determines whether an abnormal condition occurs during heating operation by the air conditioning system where the outlet temperature of the air blown into the room from the air conditioning system is below the room temperature; if it is determined that the abnormal condition has occurred, the method determines a heating temperature, which is the temperature at which the air is blown into the room from the supply device, based on the temperature difference between the room temperature and the outlet temperature of the air at a predetermined time prior to the determination of the abnormal condition. At the time the aforementioned temperature difference is detected, the required amount of heat required for the air conditioning system and the required amount of air required for the supply device based on the aforementioned temperature difference are calculated. The operating modes of the supply device are pre-set to include a ventilation mode and a heating mode having a higher heating temperature compared to the heating temperature in the ventilation mode. The heating mode includes a first heating mode having a first heating temperature as the heating temperature, and a second heating mode having a second heating temperature higher than the first heating temperature, wherein the second heating mode is pre-set to have an airflow rate greater than the airflow rate pre-set for the first heating mode. When determining the heating temperature, the ventilation mode is determined if it is determined that the abnormal condition has not occurred, while the heating mode is determined if it is determined that the abnormal condition has occurred. When determining the heating temperature of the outside air, the second heating mode is selected when the temperature difference is greater than a preset temperature threshold and the required airflow is greater than a preset airflow threshold, while the first heating mode is selected when the temperature difference is less than or equal to the temperature threshold or the required airflow is less than or equal to the airflow threshold.The present invention provides a room temperature control method in which, in the heating mode, both the ventilation heat exchanger and the refrigerant heat exchanger of the supply device are activated based on the heating temperature, and in the ventilation mode, only the ventilation heat exchanger of the supply device is activated based on the heating temperature.

[0009] According to the first invention, when an air conditioning system is in an abnormal state, outside air can be supplied into the room after being heated by the supply device based on a heating temperature determined based on the temperature difference between the room temperature and the air conditioning system's outlet temperature. Therefore, according to the first invention, it is possible to suppress a decrease in room temperature using the supply device during heating operation by the air conditioning system when the heating function is substantially stopped. In particular, since the heating temperature of the outside air is determined based on the temperature difference, it is possible to suppress the room temperature from deviating from the required temperature. Specifically, when the temperature difference is large, the heating temperature of the outside air can be set high. On the other hand, when the temperature difference is small, the heating temperature of the outside air can be set low.

[0011] Also, The one According to the invention, the operating mode is switched depending on whether or not an abnormal condition is detected. Specifically, if it is determined that no abnormal condition has occurred, the heating temperature of the supply device is adjusted to a preset temperature. On the other hand, if it is determined that an abnormal condition has occurred, the heating temperature is adjusted according to the temperature difference between the room temperature and the discharge temperature. Therefore, the process of setting the heating temperature can be simplified compared to the case where the heating temperature is adjusted according to the temperature difference between the room temperature and the discharge temperature regardless of whether or not an abnormal condition has been detected.

[0013] Also, The one According to the invention, by switching between a first heating mode and a second heating mode based on the relationship between the temperature difference between the air conditioner's outlet temperature and the room temperature, and a temperature threshold, it is possible to switch between two temperature settings (heating temperature) based on the temperature threshold when an abnormal condition is determined to be occurring. Therefore, temperature control can be simplified compared to cases where the heating temperature is adjusted (for example, calculated) according to the temperature difference.

[0015] Also, The one According to the invention, if no abnormal conditions occur, the second heating mode is selected when the required airflow rate from the supply device is greater than the airflow threshold in order to obtain the required amount of heat required by the air conditioning system. This allows the airflow rate of the supply device to be set to a large airflow rate so that the amount of heat output from the supply device approaches the required amount of heat. On the other hand, if the temperature difference is below the temperature threshold or the required airflow rate is below the airflow threshold, that is, when an abnormal condition occurs but not a large amount of heat is required from the air conditioning system, the first heating mode is selected. This allows the amount of energy required to operate the supply device to be reduced.

[0016] In the room temperature control method of the First Invention, the room temperature control method determines whether the current operating mode is the ventilation mode or the heating mode, and if the current operating mode is the heating mode, it is preferable to determine whether the current room temperature is above or below the upper limit of a preset comfortable temperature range, and if the current room temperature is above or below the upper limit of the comfortable temperature range, it is preferable to set the heating temperature in the heating mode to be equal to or lower than the current heating temperature compared to the case where the current room temperature is below the upper limit of the comfortable temperature range (First two invention).

[0017] The two According to the invention, when the current room temperature is above the upper limit of a preset comfortable temperature range, an excessive rise in room temperature can be suppressed. Therefore, in an abnormal state where the heating function of the air conditioning system is substantially stopped, it is possible to achieve both a rise in room temperature and comfort.

[0018] For example, if the heating mode includes a first heating mode and a second heating mode, the operating mode can be switched according to the current room temperature as follows. Specifically, if the current room temperature is above the upper limit of the comfortable temperature range and the current operating mode is the second heating mode, the operating mode can be switched to the first heating mode to suppress an excessive rise in room temperature. On the other hand, if the current room temperature is above the upper limit of the comfortable temperature range and the current operating mode is the first heating mode, the operating mode can be maintained in the first heating mode.

[0019] To solve the above problem, three The invention relates to a room temperature control device for controlling a supply device in a building having a room, an air conditioning device having a heating function for raising the room temperature inside the room, and a supply device that heats outside air present outside the room by a ventilation heat exchanger that exchanges heat with indoor air and a refrigerant heat exchanger that exchanges heat with a refrigerant and supplies the outside air into the room, the control device comprising: an abnormal state determination unit that determines whether an abnormal state has occurred in which the outlet temperature of the air blown into the room from the air conditioning device is below the room temperature during heating operation by the air conditioning device; a heating temperature determination unit that, when the abnormal state determination unit determines that the abnormal state has occurred, determines a heating temperature which is the temperature at which the air is blown into the room from the supply device based on the temperature difference between the room temperature and the outlet temperature of the air at a time set in advance from the determination of the abnormal state; and an output unit that outputs a signal to the supply device for operating the supply device based on the heating temperature. A required airflow calculation unit calculates the required amount of heat required for the air conditioning system and the required airflow required for the supply device based on the temperature difference at the time the temperature difference is detected. The supply device has the following operating modes, which are pre-set: a ventilation mode and a heating mode having a higher heating temperature compared to the heating temperature in the ventilation mode. The heating mode includes a first heating mode having a first heating temperature as the heating temperature, and a second heating mode having a second heating temperature higher than the first heating temperature, wherein the second heating mode is pre-set to have an airflow rate greater than the airflow rate pre-set for the first heating mode. The heating temperature determination unit determines the ventilation mode when it is determined that the abnormal condition has not occurred, and determines the heating mode when it is determined that the abnormal condition has occurred. The heating temperature determination unit selects the second heating mode when the temperature difference is greater than a preset temperature threshold and the required airflow is greater than a preset airflow threshold, while selecting the first heating mode when the temperature difference is less than or equal to the temperature threshold or the required airflow is less than or equal to the airflow threshold.The output unit provides a room temperature control device that, in the heating mode, outputs a signal to the supply device to activate both the ventilation heat exchanger and the refrigerant heat exchanger of the supply device based on the heating temperature, and in the ventilation mode, outputs a signal to the supply device to activate only the ventilation heat exchanger of the supply device based on the heating temperature.

[0020] The three According to the invention, when an air conditioning system is in an abnormal state, outside air can be supplied into the room after being heated by a supply device based on a heating temperature determined based on the temperature difference between the room temperature and the outlet temperature of the air conditioning system. three According to the invention, in an abnormal state where the heating function of an air conditioning system is substantially stopped during heating operation, a decrease in room temperature can be suppressed using a supply device. In particular, by determining the heating temperature of the outside air based on the temperature difference, it is possible to suppress the room temperature from deviating from the required temperature. Specifically, when the temperature difference is large, the heating temperature of the outside air can be set higher. On the other hand, when the temperature difference is small, the heating temperature of the outside air can be set lower.

[0022] Also, The three According to the invention, the operating mode is switched depending on whether or not an abnormal condition is detected. Specifically, if it is determined that no abnormal condition has occurred, the heating temperature of the supply device is adjusted to a preset temperature. On the other hand, if it is determined that an abnormal condition has occurred, the heating temperature is adjusted according to the temperature difference between the room temperature and the discharge temperature. Therefore, the process of setting the heating temperature can be simplified compared to the case where the heating temperature is adjusted according to the temperature difference between the room temperature and the discharge temperature regardless of whether or not an abnormal condition has been detected.

[0024] Also, The threeAccording to the invention, by switching between a first heating mode and a second heating mode based on the relationship between the temperature difference between the air conditioner's outlet temperature and the room temperature, and a temperature threshold, it is possible to switch between two temperature settings (heating temperature) based on the temperature threshold when an abnormal condition is determined to be occurring. Therefore, temperature control can be simplified compared to cases where the heating temperature is adjusted (for example, calculated) according to the temperature difference.

[0026] Also, The three According to the invention, if no abnormal conditions occur, the second heating mode is selected when the required airflow rate from the supply device is greater than the airflow threshold in order to obtain the required amount of heat required by the air conditioning system. This allows the airflow rate of the supply device to be set to a large airflow rate so that the amount of heat output from the supply device approaches the required amount of heat. On the other hand, if the temperature difference is below the temperature threshold or the required airflow rate is below the airflow threshold, that is, when an abnormal condition occurs but not a large amount of heat is required from the air conditioning system, the first heating mode is selected. This allows the amount of energy required to operate the supply device to be reduced.

[0027] The three Room temperature control of the invention Device In this, the room temperature control device further comprises an operation mode determination unit that determines whether the current operation mode is the ventilation mode or the heating mode, and a comfort temperature determination unit that determines whether the current room temperature is above or below the upper limit of a preset comfort temperature range when the current operation mode is the heating mode, and the heating temperature determination unit preferably sets the heating temperature in the heating mode to be equal to or lower than the current heating temperature when the current room temperature is above or below the upper limit of the comfort temperature range, compared to when the current room temperature is below the upper limit of the comfort temperature range ( four invention).

[0028] The fourAccording to the invention, when the current room temperature is above the upper limit of a preset comfortable temperature range, an excessive rise in room temperature can be suppressed. Therefore, in an abnormal state where the heating function of the air conditioning system is substantially stopped, it is possible to achieve both a rise in room temperature and comfort. For example, if the heating mode includes a first heating mode and a second heating mode, the operating mode can be switched according to the current room temperature as follows. Specifically, if the current room temperature is above the upper limit of the comfortable temperature range and the current operating mode is the second heating mode, an excessive rise in room temperature can be suppressed by switching the operating mode to the first heating mode. On the other hand, if the current room temperature is above the upper limit of the comfortable temperature range and the current operating mode is the first heating mode, the operating mode can be maintained in the first heating mode.

[0029] To solve the above problem, Five The invention relates to a program implemented in a room temperature control device for controlling a supply device in a building having a room, an air conditioning device having a heating function for raising the room temperature inside the room, a supply device that heats outside air present outside the room by a ventilation heat exchanger for exchanging heat with indoor air and a refrigerant heat exchanger for exchanging heat with a refrigerant and supplies the outside air into the room, the program comprising: an abnormal state determination unit that determines whether an abnormal state has occurred in which the outlet temperature of the air blown into the room from the air conditioning device is below the room temperature during heating operation by the air conditioning device; a heating temperature determination unit that, when the abnormal state determination unit determines that the abnormal state has occurred, determines a heating temperature which is the temperature at which the air is blown into the room from the supply device based on the temperature difference between the room temperature and the outlet temperature of the air at a preset time before the determination of the abnormal state; and an output unit that outputs a signal to the supply device for operating the supply device based on the heating temperature. A required airflow calculation unit calculates the required amount of heat required for the air conditioning system and the required airflow required for the supply device based on the temperature difference at the time the temperature difference is detected. The room temperature control device is then activated, and the operating modes of the supply device are pre-set to include a ventilation mode and a heating mode having a higher heating temperature compared to the heating temperature in the ventilation mode. The heating mode includes a first heating mode having a first heating temperature as the heating temperature, and a second heating mode having a second heating temperature higher than the first heating temperature, wherein the second heating mode is pre-set to have an airflow rate greater than the airflow rate pre-set for the first heating mode.The heating temperature determination unit determines the ventilation mode when it is determined that the abnormal condition has not occurred, and determines the heating mode when it is determined that the abnormal condition has occurred. The heating temperature determination unit selects the second heating mode when the temperature difference is greater than a preset temperature threshold and the required airflow is greater than a preset airflow threshold, while selecting the first heating mode when the temperature difference is less than or equal to the temperature threshold or the required airflow is less than or equal to the airflow threshold. The output unit provides a program that, in the heating mode, outputs a signal to the supply device to activate both the ventilation heat exchanger and the refrigerant heat exchanger of the supply device based on the heating temperature, and in the ventilation mode, outputs a signal to the supply device to activate only the ventilation heat exchanger of the supply device based on the heating temperature.

[0030] The Five According to the invention, when an air conditioning system is in an abnormal state, outside air can be supplied into the room after being heated by a supply device based on a heating temperature determined based on the temperature difference between the room temperature and the outlet temperature of the air conditioning system. Five According to the invention, in an abnormal state where the heating function of an air conditioning system is substantially stopped during heating operation, a decrease in room temperature can be suppressed using a supply device. In particular, by determining the heating temperature of the outside air based on the temperature difference, it is possible to suppress the room temperature from deviating from the required temperature. Specifically, when the temperature difference is large, the heating temperature of the outside air can be set higher. On the other hand, when the temperature difference is small, the heating temperature of the outside air can be set lower.

[0031] To solve the above problem, Six The invention relates to a room temperature control system installed in a building having a room, comprising: an air conditioning device having a heating function for raising the room temperature; a supply device that heats the outside air present outside the room and supplies the outside air into the room; and a control device for the supply device. three invention or The four The present invention provides a room temperature control system comprising the room temperature control device described in the invention.

[0032] The SixAccording to the invention, as described above, in an abnormal state where heating operation by the air inspection device is in progress but the heating function is substantially stopped, it is possible to suppress the decrease in room temperature using the supply device.

[0033] The Six In the room temperature control system of the invention, the supply device comprises an introduction passage for introducing outside air into the room, an outlet passage for introducing the air inside the room to the outside of the room, a ventilation heat exchanger that heats the air in the introduction passage by performing heat exchange between the air in the outlet passage and the air in the introduction passage, and a refrigerant and the air in the introduction passage air It is preferable to have a refrigerant heat exchanger that heats the air in the introduction passage by performing heat exchange with ( seven invention).

[0034] The seven According to the invention, the heat from the exhaust air inside a room can be effectively utilized to heat the air that is introduced into the room. [Effects of the Invention]

[0035] According to the present invention, it is possible to suppress a decrease in room temperature during heating operation by an air conditioning system in an abnormal state in which the heating function is substantially stopped. [Brief explanation of the drawing]

[0036] [Figure 1] This diagram shows the configuration of a building in which the room temperature control system according to the embodiment is installed. [Figure 2] This is a block diagram showing the electrical configuration of a room temperature control system according to an embodiment. [Figure 3] This is a block diagram showing the electrical configuration of a ventilation device according to an embodiment. [Figure 4] This figure shows the operating modes of the ventilation device according to the embodiment. [Figure 5] This flowchart shows the process performed by the room temperature control device according to the embodiment. [Figure 6] This flowchart shows the process performed by the room temperature control device according to the embodiment. [Figure 7] This is a timing chart showing changes in room temperature and operating mode settings. [Modes for carrying out the invention]

[0037] 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.

[0038] An example of a room temperature control system will be described with reference to Figures 1 and 2. Figure 1 is a diagram showing the configuration of a building in which the room temperature control system according to the embodiment is constructed. 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 comprises an air conditioning device 1, a ventilation device 2, a room temperature control device 15 that can communicate with the air conditioning device 1 and the ventilation device 2 via a communication network, etc., a room temperature detector 14, and an air conditioning outlet temperature detector 18. The ventilation device 2 corresponds to an example of a "supply device" in this disclosure.

[0039] The air conditioning system 1 and the ventilation system 2 are installed in an area S within a building partitioned by side walls 51 and a roof 50 on a foundation 52. Area S includes, for example, the underfloor space S1, the first-floor space (first room) S2, the second-floor space (second room) S3, and the attic space S4. Users reside in the first-floor space S2 and the second-floor space S3. In the following description, area S will be referred to as "inside the room," the air present within area S will be referred to as "indoor air," and the air present or present outside area S will be referred to as "outside air." Indoor air can move between the underfloor space S1, the first-floor space S2, the second-floor space S3, and the attic space S4 through louvers installed within the building. In this embodiment, a winter situation is assumed where the temperature of the outside air is lower than the temperature of the indoor air. The temperature of the outside air is, for example, 0°C.

[0040] The air conditioning system 1 adjusts the temperature of the indoor air present in area S. Specifically, the air conditioning system 1 comprises an indoor air conditioning unit 10 and an outdoor air conditioning unit 20. The indoor air conditioning unit 10 is installed in the underfloor space S1. The indoor air conditioning unit 10 comprises an 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 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 indoor heat exchanger is positioned between the intake port 17a and the outlet port 17b. The air conditioning system 1 circulates the indoor air AI within area S. Specifically, indoor air AI is drawn into the housing 17 from within area S via the intake port 17a. In addition, discharge air AO is blown out from within the housing 17 toward area S via the outlet port 17b.

[0041] The air conditioning outdoor unit 20 is located outside area S. The air conditioning 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 a four-way directional control valve (not shown). The compressor, outdoor heat exchanger, outdoor fan, and four-way directional control valve are housed in the housing 27. The indoor heat exchanger, four-way directional control valve, compressor, and outdoor heat exchanger are connected by refrigerant piping 41 to form a refrigerant circuit. The refrigerant sealed in the refrigerant circuit is not particularly limited, but for example, an HFC (hydrofluorocarbon) refrigerant such as R32 or R410A may be used. The four-way directional control valve switches the flow path so that the refrigerant circulates in either the order of compressor, outdoor heat exchanger, and indoor heat exchanger, or the order of compressor, indoor heat exchanger, and outdoor heat exchanger.

[0042] The room temperature detector 14 detects the temperature T of the indoor air present within region S. AI The room temperature detector 14 measures the temperature T of the indoor air AI drawn into the intake port 17a from within region S. AI It is located near the intake port 17a to measure the temperature of the indoor air AI. The room temperature detector 14 is located near the intake port 17a, but is not particularly limited to that location. AIFrom the standpoint of accurately measuring the temperature, it is preferable that the device be spaced apart from the air outlet 17b and also spaced apart from the indoor supply fan 31 of the ventilation device 2, which will be described later.

[0043] The air conditioning outlet temperature detector 18 detects the outlet temperature T of the air AO blown out from the indoor air conditioning unit 10 toward the region S. AO The temperature is measured. Specifically, the air conditioning outlet temperature detector 18 is located near the outlet 17b.

[0044] 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. Furthermore, the room temperature control device 15 is configured to allow users within area S to input predetermined information, such as operating details, through an operation panel installed on the side wall 51, etc. Specifically, the room temperature control device 15 may be composed of an information terminal such as a PC (personal computer), tablet, or smartphone.

[0045] The air conditioning unit 1 operates based on information indicating the operating settings set by the user. These operating settings include "cooling operation" and "heating operation." Specifically, the air conditioning unit 1 operates based on the operating settings set by the user and the temperature T of the indoor air AI measured by a temperature detector (not shown). AI Based on this, the indoor air conditioning unit 10 and the outdoor air conditioning unit 20 are controlled to control the temperature T AI Adjust.

[0046] Specifically, in "cooling operation," the indoor heat exchanger acts as an evaporator and the outdoor heat exchanger acts as a condenser. Specifically, in cooling operation, the air conditioning system 1 operates by switching the position of the valve body of the four-way switching valve so that the refrigerant circulates in the order of compressor, outdoor heat exchanger, and indoor heat exchanger.

[0047] On the one hand, during the "heating operation", the indoor heat exchanger acts as a condenser, and the outdoor heat exchanger acts as an evaporator. Specifically, in the heating operation, the air conditioner 1 operates to switch the position of the valve body of the four-way switching valve so that the refrigerant circulates in the order of the compressor, the indoor heat exchanger, and the outdoor heat exchanger.

[0048] Here, during the "heating operation", a "temperature adjustment operation" for adjusting the room temperature and various "non-temperature adjustment operations" not aimed at room temperature adjustment are performed. In the "temperature adjustment operation", the indoor air AI is heated. Specifically, in the "temperature adjustment operation", the heating capacity is adjusted by changing the rotational speed of the compressor or the like. For example, based on the volume of the region S, the temperature T of the indoor air AI, and the set temperature set for the heating operation, the required heat quantity required for the air conditioner 1 is calculated, and the heating capacity is adjusted. For example, the blowing temperature T of the blown air AO blown from the air outlet 17b into the region S AI becomes 45°C. AO is 45°C.

[0049] On the other hand, the "non-temperature adjustment operation" is an operation necessary for preparing to perform the heating operation efficiently or more comfortably without aiming at room temperature adjustment. Examples of the "non-temperature adjustment operation" include the "defrosting operation". The "non-temperature adjustment operation" substantially generates a heating load.

[0050] The "defrosting operation" is an operation for defrosting the outdoor heat exchanger when it frosts during the "heating operation", and is executed during the "heating operation" using the detection result of a sensor that detects that the outdoor heat exchanger (air conditioning outdoor unit 20) has frosted. In the present embodiment, as a method of the "defrosting operation", a method of performing the refrigerant circuit as a cooling cycle is adopted. Specifically, the air conditioner 1 switches the position of the valve body of the four-way switching valve so that the refrigerant circulates in the order of the compressor, the outdoor heat exchanger, and the indoor heat exchanger. In other words, during the "defrosting operation", the air conditioner 1 stops the heating function and substantially performs a cooling operation. For example, the blowing temperature T of the blown air AO blown from the air outlet 17b into the region S AO is the blowing temperature T of the blown air AO blown during the "temperature adjustment operation"AO The temperature will be lower than (for example, 45°C) (for example, 18°C).

[0051] Next, the ventilation device 2 will be described with reference to Figures 1 to 3. Figure 3 is a block diagram showing the electrical configuration of the ventilation device 2 according to this embodiment. As shown in Figures 1 to 3, the ventilation device 2 ventilates within area S. Specifically, the ventilation device 2 comprises an indoor ventilation unit 70, an outdoor ventilation unit 60, an outside air intake fan 63, and an external exhaust fan 64.

[0052] The ventilation indoor unit 70 is installed in the attic space S4. The ventilation indoor unit 70 heats the outside air present outside area S and supplies the outside air into area S. Specifically, the ventilation indoor unit 70 includes a ventilation heat exchanger 30 that exchanges heat between indoor air and outside air, an indoor supply fan 31 that supplies outside air into area S, an indoor air intake fan 32 that takes in indoor air VO1 and VO2 from inside area S, and a refrigerant heat exchanger 34 that exchanges heat between a refrigerant and outside air.

[0053] The number of indoor supply fans 31 may vary, but in this embodiment, there is a first indoor supply fan 31a (see Figure 1) and a second indoor supply fan 31b (see Figure 1). The first indoor supply fan 31a supplies outside air to the first-floor space S2. The second indoor supply fan 31b supplies outside air to the second-floor space S3. Furthermore, the airflow of outside air is adjusted by adjusting the rotational speed of the first indoor supply fan 31a and the second indoor supply fan 31b.

[0054] Furthermore, there may be any number of indoor air intake fans 32, but in this embodiment, there is a first indoor air intake fan 32a (see Figure 1) and a second indoor air intake fan 32b (see Figure 1). The first indoor air intake fan 32a takes in indoor air VO1 from the first-floor space S2. The second indoor air intake fan 32b takes in indoor air VO2 from the second-floor space S3.

[0055] The outdoor ventilation unit 60 comprises a housing 61 and a refrigerant heat exchanger 62. The refrigerant heat exchanger 62 is housed in the housing 61. The outside air intake fan 63 and the outside exhaust fan 64 are located on the side wall 51.

[0056] The ventilation system 2 further includes an introduction passage 35 for guiding outside air into area S and an outlet passage 36 for guiding indoor air from area S to the outside of area S. The introduction passage 35 is located in the side wall 51 and the underfloor space S1 and connects the outside air intake fan 63 and the indoor supply fan 31. The outlet passage 36 is located in the side wall 51 and the underfloor space S1 and connects the indoor air intake fan 32 and the external exhaust fan 64.

[0057] The ventilation heat exchanger 30 performs heat exchange between indoor air AI in the outlet passage 36 and outside air in the inlet passage 35. Specifically, room temperature T AI If the temperature of the heated air is higher than the ambient temperature, the ambient air is heated and supplied into region S. On the other hand, if the ambient temperature is room temperature T AI If the temperature is higher than the ambient temperature, the outside air is cooled and supplied into region S. For example, the temperature of the outside air in the introduction passage 35 is 0°C, and the temperatures of the indoor air VO1 and VO2 in the outlet passage 36 are room temperature T. AI Therefore, the temperature of the outside air inside the introduction passage 35 is lower than room temperature T AI It is heated to a temperature close to [a certain temperature].

[0058] Furthermore, the ventilation device 2 according to this embodiment also has a heating function. In the ventilation device 2, the refrigerant heat exchanger 34 and the refrigerant heat exchanger 62 are connected by refrigerant piping 65, forming a refrigerant circuit. Specifically, in the "heating mode" of the operating modes described later, the refrigerant heat exchanger 34 acts as a condenser and the refrigerant heat exchanger 62 acts as an evaporator. More specifically, the refrigerant circulates in the order of refrigerant heat exchanger 34 and then refrigerant heat exchanger 62. The refrigerant sealed in the refrigerant circuit is not particularly limited, but for example, HFC refrigerants such as R32 or R410A may be used.

[0059] In detail, the refrigerant heat exchanger 34 heats the outside air in the introduction passage 35 by exchanging heat between the refrigerant in the refrigerant piping 65 and the outside air in the introduction passage 35. In other words, the outside air supplied to the area S by the ventilation device 2 is heated by the indoor air VO1 and VO2, and then heated by the refrigerant. In this embodiment, a heat exchanger is provided for the heating function, but any device capable of heating outside air is acceptable, and a heater may also be provided.

[0060] Next, with reference to Figure 4, the operating modes of the ventilation device 2 according to the embodiment will be described. Figure 4 is a diagram showing the operating modes of the ventilation device 2 according to the embodiment. As shown in Figure 4, the operating modes of the ventilation device 2 include a "ventilation mode" and a "heating mode". Furthermore, the "heating mode" includes a "heating stabilization mode" and a "heating rise-up mode". The "heating stabilization mode" corresponds to an example of the "first heating mode" in this disclosure. The "heating rise-up mode" corresponds to an example of the "second heating mode" in this disclosure.

[0061] The "ventilation mode" is set when the air conditioning system 1, described later, is not in an abnormal state (i.e., in a normal state), and the "heating mode" is set when the air conditioning system 1 is in an abnormal state. The "ventilation mode" is a mode in which the outside air supplied by the ventilation system 2 is heated only by the indoor air VO1 and VO2. In other words, in "ventilation mode", the outside air supplied by the ventilation system 2 is not heated by the refrigerant in the refrigerant heat exchanger 34 (the heating temperature by the refrigerant in the refrigerant heat exchanger 34 is set to 0°C). In addition, the "ventilation mode" has a first airflow rate (for example, 150 m³) which is the airflow rate of the outside air supplied by the ventilation system 2. 3 The / h) setting is enabled.

[0062] The "heating mode" is a mode in which the outside air supplied by the ventilation device 2 is heated by the indoor air VO1, VO2 and the refrigerant from the refrigerant heat exchanger 34. In other words, the "heating mode" has a higher heating temperature T compared to the heating temperature in the "ventilation mode". VIThe system has the following features: The "stable heating mode" is set when the amount of heat required for the ventilation device 2 is small, and the "startup heating mode" is set when the amount of heat required for the ventilation device 2 is large.

[0063] Specifically, the "stable heating mode" is set to the heating temperature T VI It has a first heating temperature (e.g., 30°C). Also, the "stable heating mode" has the same first airflow rate as the "ventilation mode" (e.g., 150 m³). 3 The setting is / h). On the other hand, the "heating start-up mode" is set to a heating temperature T VI It has a second heating temperature (e.g., 45°C) that is higher than the first heating temperature. Also, the "heating start-up mode" has a first airflow (e.g., 150m³). 3 A second airflow (e.g., 200m) greater than the second airflow ( / h) 3 The / h) setting is enabled.

[0064] Referring again to Figure 2, the configuration of the room temperature control device 15 will be explained. As shown in Figure 2, the room temperature control device 15 selects the operating mode of the ventilation device 2 based on the operating information of the air conditioner 1 output from the air conditioner 1. Specifically, the room temperature control device 15 includes an abnormal state determination unit 151, a heating temperature determination unit 152, a timer 156, an output unit 157, and a storage unit 158.

[0065] The storage unit 158 ​​is composed of any recording medium such as an HDD (hard disk drive), SSD (solid state drive), or semiconductor memory. The storage unit 158 ​​pre-records a program and table information indicating the operating mode as shown in Figure 4. The program is implemented in the room temperature control device 15 that controls the ventilation device 2. The program may be provided to the user by being stored on a computer-readable recording medium such as a CD-ROM. Alternatively, the program may be stored on 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.

[0066] The abnormal condition determination unit 151 determines whether or not an abnormal condition has occurred. An abnormal condition is the discharge temperature T of the air AO blown out from the air conditioner 1 during "heating operation" by the air conditioner 1. AO At room temperature T AI The following is the state. In other words, the abnormal state is that while "heating operation" is being performed, the air outlet temperature T of AO is not being maintained. AO At room temperature T AI The following conditions are observed: During "heating operation," "defrost operation" is performed under predetermined conditions, for example, the outlet temperature T of the discharged air AO blown into area S from outlet 17b. AO The discharge temperature T of the discharged air AO that was being blown out during "temperature control operation" is shown. AO The temperature will be lower than (for example, 18°C) (for example, 45°C). As a result, the outlet temperature T of the discharged air AO blown into region S from outlet 17b will be lower. AO However, room temperature T AI The following may occur. Therefore, the abnormal state determination unit 151 determines the temperature T measured by the air conditioner outlet temperature detector 18 during "heating operation". AO However, the room temperature T measured by the room temperature detector 14 AI It determines whether the following conditions are met, that is, whether or not an abnormal state exists.

[0067] The heating temperature determination unit 152, when the abnormal condition determination unit 151 determines that an abnormal condition has occurred, determines the room temperature T at a preset time (for example, 1 minute) prior to the determination of the abnormal condition. AI The outlet temperature T of the air AO blown out from the air conditioner 1 AO Temperature difference ΔT A Based on this, the ventilation device 2 determines the heating temperature of the outside air supplied into the room. Specifically, the abnormal state determination unit 151 determines the "ventilation mode" when it is determined that no abnormal state has occurred, and the "heating mode" when it is determined that an abnormal state has occurred. More specifically, the heating temperature determination unit 152 determines the temperature difference ΔT A When the temperature difference ΔT is greater than a preset temperature threshold, and the required airflow for the ventilation device 2 is greater than a preset airflow threshold, the "second heating mode" is selected, while the temperature difference ΔT ASelect "First Heating Mode" when the temperature is below the threshold or the required airflow is below the airflow threshold.

[0068] As described above, the heating temperature specification unit 152 determines the outlet temperature T of the air AO blown out from the air conditioner 1. AO At room temperature T AI In a normal state where the value exceeds a certain threshold, the ventilation device 2 does not heat the outside air supplied by the refrigerant in the refrigerant heat exchanger 34.

[0069] On the other hand, the heating temperature determination unit 152 determines that an abnormal condition has occurred by the abnormal condition determination unit 151, and then identifies the "heating mode".

[0070] Next, the necessary airflow calculation unit 153, which is required for the heating temperature determination unit 152 to determine whether to specify the "heating start-up mode" or the "heating stable mode" among the "heating modes," will be described. The storage unit 158 ​​stores threshold information for determining whether to specify the "heating start-up mode" or the "heating stable mode." The threshold information includes a temperature threshold and an airflow threshold. The temperature threshold is the discharge temperature T requested by the air conditioner 1 before an abnormal condition is determined (a preset time before). AO This is used to determine whether the temperature difference ΔT is high or low, for example. A The value is set to 10°C. The airflow threshold is used to determine whether the airflow required by the ventilation device 2 is large, for example, 150m 3 It is set to / h.

[0071] The required airflow calculation unit 153 obtains the airflow of the air conditioner 1 at a preset time (for example, 1 minute) prior to the time when an abnormal condition is determined, and calculates this airflow and the temperature difference ΔT. A Based on this, the required heat quantity for the air conditioning system 1 is calculated using the following formula (1).

[0072] Required heat for air conditioning system = 0.35 × Airflow rate of air conditioning system × Temperature difference ΔT A ...(1) Furthermore, the required airflow calculation unit 153 calculates the required heat quantity required for the air conditioning device 1, and the temperature difference ΔT. A Based on this, the required airflow for ventilation device 2 is calculated using the following formula (2).

[0073] Required airflow for ventilation system = Required heat for air conditioning system ÷ 0.35 ÷ Temperature difference ΔT A ...(2) The heating temperature specification unit 152 determines the temperature difference ΔT A The "heating start-up mode" is selected when the temperature is greater than the temperature threshold and the required airflow is greater than the preset airflow threshold. In other words, in this case, a relatively large heating temperature and airflow are required, so the heating temperature T VI A second heating temperature (e.g., 45°C) is specified, and a second airflow rate (e.g., 200 m³) is specified. 3 / h) is identified.

[0074] On the other hand, the heating temperature specification unit 152 determines the temperature difference ΔT A The "Stable Heating Mode" is selected when the temperature is below the threshold or the required airflow is below the airflow threshold. In other words, in this case, a very high heating temperature and airflow are not required, so the heating temperature T VI A first heating temperature (e.g., 30°C) is specified, and a first airflow rate (e.g., 150 m³) is specified. 3 / h) is identified.

[0075] The output unit 157 is set to a heating temperature T VI Based on this, a signal is output to the ventilation device 2 to activate it. Specifically, the output unit 157 outputs a signal to the ventilation device 2 so that the operating mode selected by the heating temperature specification unit 152 is set. More specifically, the output unit 157 outputs a signal to the ventilation device 2 so that the operating mode is one of the following: "ventilation mode", "heating start-up mode", or "heating stable mode".

[0076] As described above, according to the embodiment, room temperature T AI and the outlet temperature of the air AO T AO Temperature difference ΔT ABy switching between "heating start-up mode" and "heating stable mode" based on the relationship between the temperature threshold and the temperature difference, it is possible to switch between two temperature settings, "heating start-up mode" and "heating stable mode," based on the temperature threshold when an abnormal condition is determined to be occurring. Therefore, the temperature difference ΔT A Heating temperature T VI Compared to calculating the temperature, this method simplifies temperature control.

[0077] Furthermore, according to the embodiment, if no abnormal conditions occur, the required airflow rate required by the ventilation device 2 to obtain the required amount of heat required by the air conditioning device 1 is greater than the airflow rate threshold, in which case the "heating start-up mode" is selected. This allows the airflow rate of the ventilation device 2 to be set to a large second airflow rate so that the amount of heat output from the ventilation device 2 approaches the required amount of heat. On the other hand, the temperature difference ΔT A When the temperature is below the threshold or the required airflow is below the airflow threshold, that is, when an abnormal condition occurs but not a large amount of heat is required for the air conditioning system 1, the "heating stable mode" is selected. This reduces the amount of energy (power consumption) required to drive the ventilation system 2.

[0078] Referring to Figure 5, the room temperature control method for determining which of the following operating modes—"ventilation mode," "heating start-up mode," and "heating stable mode"—to be executed during "heating operation" by the air conditioning unit 1 will be described in detail. Figure 5 is a flowchart showing the processes performed by the room temperature control system. As shown in Figure 5, the room temperature control method comprises steps S101 to S113.

[0079] In step S101, the air outlet temperature T of the air AO blown from the indoor air conditioning unit 10 toward area S is detected by the air conditioning outlet temperature detector 18. AO The temperature T of the air AI drawn in from region S to the intake port 17a is detected by the room temperature detector 14. AI (That is, room temperature) is detected and input to the room temperature control device 15.

[0080] In step S102, the discharge temperature T is set by timer 156. AO It is determined whether or not one minute has passed since the detection. Outlet temperature T AO If it is determined that less than one minute has passed since the detection of (NO in step S102), the process executed by the room temperature control device 15 returns to step S102. Meanwhile, the discharge temperature T AO If it is determined that one minute has elapsed since the detection of the issue, the process proceeds to step S103.

[0081] In step S103, the air conditioner outlet temperature detector 18 detects the outlet temperature T AO The temperature T of the air AI drawn in from region S to the intake port 17a is detected by the room temperature detector 14. AI (In other words, room temperature) is detected.

[0082] In step S104, the abnormal condition determination unit 151 determines the discharge temperature T detected in step S103. AO and room temperature T AI Based on the discharge temperature T AO At room temperature T AI The system determines whether or not one of the following abnormal conditions has occurred. If the abnormal condition determination unit 151 determines that no abnormal condition has occurred, the process proceeds to step S105. In step S105, the heating temperature determination unit 152 determines "ventilation mode" as the operating mode, and the ventilation device 2 executes "ventilation mode".

[0083] On the other hand, if the abnormal condition determination unit 151 determines in step S104 that an abnormal condition has occurred, the process proceeds to step S106. In step S106, the airflow rate is obtained from the air conditioner 1, and the room temperature T at a preset time before the abnormal condition determination (the time of execution of step S101) is determined by the heating temperature determination unit 152. AI The outlet temperature T of the air AO blown out from the air conditioner 1 AO Temperature difference ΔT A (The temperature difference ΔT at step S101 follows below) AFurthermore, in step S106, the required airflow calculation unit 153 calculates the temperature difference ΔT based on the above formula (1). A The required amount of heat that was needed for the air conditioning system 1 at the time it was detected (when step S101 was executed) is calculated.

[0084] In step S107, the required airflow calculation unit 153 uses equation (2) above to calculate the required heat quantity for the air conditioner 1 calculated in step S106, and the temperature difference ΔT at the time of step S101. A Based on this, the required airflow for ventilation device 2 is calculated.

[0085] In step S108, the heating temperature specification unit 152 determines the temperature difference ΔT at the time of step S101. A It is determined whether the temperature is greater than the temperature threshold (10°C in this example). The heating temperature determination unit 152 determines the temperature difference ΔT at step S101. A If it is determined that the temperature is below the temperature threshold (NO in step S108), the process proceeds to step S109. In step S109, the heating temperature determination unit 152 determines the "heating stable mode," and the "heating stable mode" is executed by the ventilation device 2.

[0086] On the other hand, the heating temperature specification unit 152 determines the temperature difference ΔT at step S101. A If it is determined that the required airflow is greater than the temperature threshold (YES in step S108), the process proceeds to step S110. In step S110, the heating temperature determination unit 152 determines that the required airflow is greater than the airflow threshold (150 m in this example). 3 It is determined whether the value is greater than / h. If the heating temperature determination unit 152 determines that the required airflow is less than or equal to the airflow threshold (NO in step S109), the process proceeds to step S109.

[0087] On the other hand, if the heating temperature determination unit 152 determines that the required airflow is greater than the airflow threshold, the process proceeds to step S111. In step S111, the heating temperature determination unit 152 determines the "heating start-up mode," and the "heating start-up mode" is executed by the ventilation device 2.

[0088] After step S105, step S109, or step S111 is completed, in step S112, the timer 156 determines whether or not one hour has elapsed since the start of the operation mode (step S105, S109, or S111). If the room temperature control device 15 determines that one hour has not elapsed since the start of the operation mode, the process proceeds to step S113. In step S113, the heating temperature determination unit 152 determines the current operation mode, the ventilation device 2 executes the current operation mode, and step S112 is executed. On the other hand, if the timer 156 determines in step S112 that one hour has elapsed since the start of the operation mode, the process returns to the start.

[0089] Referring again to Figure 2, the configuration of the room temperature control device 15 for suppressing excessive room temperature rise due to the ventilation device 2 will be described in detail. As shown in Figure 2, the room temperature control device 15 further comprises an operating mode determination unit 154 and a comfortable temperature determination unit 155. The storage unit 158 ​​further records the upper limit Tx of the comfortable temperature range. The upper limit Tx of the comfortable temperature range indicates a threshold for determining whether a person located in the room will find the room temperature uncomfortable. The upper limit Tx of the comfortable temperature range is not particularly limited, but for example it is 24°C.

[0090] The operation mode determination unit 154 determines whether the current operation mode set for the ventilation device 2 is "ventilation mode" or "heating mode".

[0091] The comfort temperature determination unit 155 determines the current room temperature T when the current operating mode is "heating mode". AI It determines whether the temperature is above or below the upper limit Tx of the pre-set comfort temperature range.

[0092] The heating temperature determination unit 152 determines the current room temperature T AI If the temperature is above the upper limit Tx of the comfortable temperature range, the current room temperature T AI Compared to when the heating temperature Tx is below the upper limit Tx of the comfortable temperature range, the heating temperature Tx in "heating mode" VISet the current heating temperature to the same level as or lower than the current heating temperature. Specifically, the current room temperature T AI If the temperature is above the upper limit Tx of the comfortable temperature range, and the current operating mode is "heating start-up mode", the operating mode will be switched to "heating stable mode" to raise the room temperature Tx. AI This suppresses an excessive rise in temperature. Meanwhile, the current room temperature T AI If the temperature is above the upper limit Tx of the comfortable temperature range, and the current operating mode is "heating stable mode", the operating mode will be maintained in "heating stable mode".

[0093] As explained above, according to the embodiment, the current room temperature T AI If the temperature is above the upper limit Tx of the comfortable temperature range, excessive room temperature T AI The rise in temperature can be suppressed. Therefore, in an abnormal state in which the heating function of the air conditioning unit 1 is substantially stopped, the room temperature T AI This allows for a balance between increased comfort and improved performance.

[0094] Next, referring to Figure 6, a method for controlling the room temperature to suppress excessive room temperature rise caused by the ventilation device 2 will be described in detail. Figure 6 is a flowchart showing the processes performed by the air conditioning system. As shown in Figure 6, the room temperature control method of the air conditioning system comprises steps S201 to S208. The processes shown in Figure 6 may be performed continuously, or they may be performed only during the period in which an abnormal condition is detected in step S104 shown in Figure 5.

[0095] In step S201, the operation mode determination unit 154 acquires the current operation mode.

[0096] In step S202, the operation mode determination unit 154 determines whether the current operation mode is the "ventilation mode" or the "heating mode". If the operation mode determination unit 154 determines that the current operation mode is the "ventilation mode", the process proceeds to step S203. In step S203, the heating temperature specifying unit 152 specifies the current operation mode, and the current operation mode, that is, the "ventilation mode" in the above case, is executed by the ventilation device 2.

[0097] On the other hand, if the operation mode determination unit 154 determines that the current operation mode is the "heating mode", the process proceeds to step S204. In step S204, the room temperature detector 14 detects the temperature T AI of the indoor air AI.

[0098] In step S205, the comfortable temperature determination unit 155 determines whether the current room temperature T AI is equal to or higher than the upper limit Tx of the comfortable temperature range. If the comfortable temperature determination unit 155 determines that the current room temperature is not equal to or higher than the upper limit Tx of the comfortable temperature range, the process proceeds to step S203 and the current operation mode is executed.

[0099] On the other hand, if the comfortable temperature determination unit 155 determines that the current room temperature T AI is equal to or higher than the upper limit Tx of the comfortable temperature range, the process proceeds to step S206. In step S206, the heating temperature specifying unit 152 specifies the "heating stable mode" as the operation mode, and the "heating stable mode" is executed by the ventilation device 2.

[0100] After step S203 or step S206 ends, in step S207, the timer 156 determines whether 10 minutes have elapsed since the start of the execution of the operation mode (step S203 or S206). If it is determined by the timer 156 that 10 minutes have not elapsed since the start of the execution of the operation mode, the process proceeds to step S208. In step S208, the heating temperature specifying unit 152 specifies the current operation mode, and the ventilation device 2 executes the current operation mode. On the other hand, if it is determined by the timer 156 that 10 minutes have elapsed since the start, the process returns to the start. Since the set time (10 minutes) in step S207 of FIG. 6 is shorter than the set time (1 hour) in step S112 of FIG. 5, during the execution period of the operation mode specified by the process of FIG. 5, it is possible to finely suppress excessive heating based on comfort. These set times are not limited to the exemplified times.

[0101] Subsequently, referring to FIG. 7, an example of the effect of executing the "operation mode setting process" during the "heating operation" by the air conditioner 1 will be described. FIG. 7 shows a timing chart showing the state of the room temperature change and the setting change of the operation mode. In FIG. 7, the vertical axis represents temperature and the horizontal axis represents time. The two-dot chain line represents the room temperature T AI is shown. The one-dot chain line represents the blowing temperature T AO is shown. The solid line represents the heating temperature T VI is shown.

[0102] At time t0, the air conditioner 1 starts the "temperature adjustment operation". In the refrigerant heat exchanger 34, the indoor air AI sucked from the suction port 17a is heated by the refrigerant in the refrigerant pipe 41. As a result, the blowing temperature T AO of the air AO blown from the air conditioner indoor unit 10 into the region S is 45°C. Thereby, between time t0 and time t1, the room temperature T AI changes from a temperature of less than 10°C to about 21°C.

[0103] Furthermore, at time t0, the operating mode setting of the ventilation device 2 is set to "ventilation mode". The ventilation heat exchanger 30 heats the outside air in the introduction passage 35 by exchanging heat between the indoor air in the outlet passage 36 and the outside air in the introduction passage 35. The heating temperature T of the air blown from the ventilation device 2 toward area S VI is, room temperature T AI It is close to that temperature.

[0104] At time t1, due to frost formation on the outdoor unit 20, the operation of the air conditioning system 1 switches from "temperature control operation" to "defrost operation". In the refrigerant heat exchanger 34, the indoor air AI drawn in from the intake port 17a is cooled by the refrigerant in the refrigerant piping 41. As a result, the outlet temperature T of the air AO blown out from the indoor unit 10 toward area S AO is, room temperature T AI The temperature has dropped to a lower level (below 20°C in the example shown in the diagram).

[0105] As a result, at time t1, the outlet temperature T AO At room temperature T AI The temperature becomes lower than the specified value, and the abnormal condition determination unit 151 determines that an abnormal condition has occurred, and the operating mode setting of the ventilation device 2 is set to "heating start-up mode". The refrigerant heat exchanger 34 heats the air in the introduction passage 35 by performing heat exchange between the refrigerant in the refrigerant piping 65 and the air in the introduction passage 35. The heated temperature T of the air blown out from the ventilation device 2 toward area S VI The temperature rises (approximately 45°C in Figure 7). As a result, the room temperature T AI The decrease in temperature is suppressed. Note that the discharge temperature T is the temperature at a predetermined time (1 minute) before time t1. AO and room temperature T AI Temperature difference ΔT A Since the temperature is greater than the temperature threshold (for example, 10°C) and the required airflow for the air conditioning unit 1 is large, the "heating start-up mode" is set at time t1.

[0106] At time t2, the operation of the air conditioning system 1 switches from "defrost operation" to "temperature control operation" as frost on the outdoor unit 20 is eliminated. In the refrigerant heat exchanger 34, the indoor air AI drawn in from the intake port 17a is heated by the refrigerant in the refrigerant piping 41. As a result, the outlet temperature T of the air AO blown out from the indoor unit 10 into area S AO The temperature rises (approximately 45°C in Figure 7). As a result, the room temperature T AI It will rise.

[0107] On the other hand, at time t2, the discharge temperature T AO At room temperature T AI As the temperature rises, the abnormal condition determination unit 151 determines that no abnormal condition has occurred, and the operating mode of the ventilation device 2 is set to "ventilation mode". The ventilation heat exchanger 30 heats the outside air in the introduction passage 35 by exchanging heat between the indoor air in the outlet passage 36 and the outside air in the introduction passage 35. The heating temperature T of the air blown out from the ventilation device 2 toward area S VI It will decline.

[0108] At time t3, due to frost formation on the outdoor unit 20 of the air conditioner, the operation of the air conditioning system 1 switches from "temperature control operation" to "defrost operation". Note that the discharge temperature T was set a predetermined time (1 minute) before time t3. AO and room temperature T AI Temperature difference ΔT A Since the temperature is greater than the temperature threshold (e.g., 10°C) and the required airflow for the air conditioning unit 1 is large, the operating mode of the ventilation unit 2 is set to "heating start-up mode". The heating temperature T of the air blown from the ventilation unit 2 into area S VI As the temperature rises (approximately 45°C in Figure 7), the room temperature T AI The temperature rises (it rises to 24°C in Figure 7).

[0109] As a result, at time t4, the current room temperature T AIIt is determined that the temperature is above the upper limit Tx of the comfortable temperature range. As a result, the operating mode of the ventilation device 2 is changed from "heating rise mode" to "heating stable mode". The heating temperature T of the air blown from the ventilation device 2 into area S VI This results in a lower temperature (approximately 30°C in Figure 7) compared to the "heating start-up mode," which in turn lowers the room temperature T AI This is being maintained.

[0110] At time t5, as frost on the outdoor unit 20 of the air conditioner is removed, the operation of the air conditioner 1 switches from "defrost operation" to "temperature control operation". As a result, the outlet temperature T of the air AO blown from the indoor unit 10 into area S is reduced. AO The temperature rises (approximately 45°C in Figure 7).

[0111] On the other hand, at time t5, the discharge temperature T AO At room temperature T AI The temperature becomes higher. As a result, it is determined that no abnormal condition has occurred, and the operating mode of the ventilation device 2 is set to "ventilation mode". In the ventilation device 2, heating of the refrigerant heat exchanger 34 by the refrigerant is stopped, and as a result, the heating temperature T of the air blown out from the ventilation device 2 into area S is lowered. VI It decreases.

[0112] As explained above, according to the embodiment, when the air conditioning system 1 is in an abnormal state, the room temperature T AI and the outlet temperature of the air AO T AO Temperature difference ΔT A The heating temperature T determined based on VI Based on this, outside air can be supplied into region S while the outside air is heated by the ventilation device 2. Therefore, according to this embodiment, during "defrost operation", the room temperature T can be heated by the ventilation device 2. AI This can suppress the decrease in [the relevant factor].

[0113] Furthermore, the present invention is not limited to the embodiments described above, and for example, the following embodiments may also be adopted.

[0114] (1) In the above embodiment, an air purifier may be provided in front of the air conditioning unit 1. The air purifier collects airborne particles such as dust contained in the air.

[0115] (2) In the above embodiment, region S included the underfloor space S1, the first-floor space S2, the second-floor space S3, and the attic space S4, but region S is not limited to these. For example, region S may further include the third-floor space and the fourth-floor space. Also, region S does not have to include the underfloor space S1 or the attic space S4. [Explanation of symbols]

[0116] 1. Air conditioning system 2. Ventilation system (supply system) 15 Room temperature control device 30 Ventilation heat exchanger 35 Introduction passage 36 Lead-out passage 151 Abnormal State Determination Unit 152 Heating temperature identification section 153 Required air volume calculation section 154 Operation Mode Determination Unit 155 Comfortable temperature determination section 157 Output section S area (buildings)

Claims

1. A method for controlling room temperature in a building comprising: a room; an air conditioning system having a heating function for raising the room temperature; a supply device that heats outside air present outside the room by a ventilation heat exchanger that exchanges heat with indoor air, and a refrigerant heat exchanger that exchanges heat with a refrigerant, and supplies the outside air into the room, During heating operation by the air conditioning system, it is determined whether an abnormal condition occurs in which the temperature of the air blown from the air conditioning system into the room falls below the room temperature. If it is determined that the aforementioned abnormal condition has occurred, the heating temperature, which is the temperature at which the air is blown into the room from the supply device, is determined based on the temperature difference between the room temperature and the blown air temperature at a predetermined time prior to the determination of the abnormal condition. At the time the aforementioned temperature difference is detected, the required amount of heat required for the air conditioning system and the required amount of air required for the supply device based on the aforementioned temperature difference are calculated. The operating modes of the supply device are pre-set to include a ventilation mode and a heating mode having a higher heating temperature compared to the heating temperature in the ventilation mode. The heating mode includes a first heating mode having a first heating temperature as the heating temperature, and a second heating mode having a second heating temperature higher than the first heating temperature. The second heating mode is pre-set to have an airflow rate greater than the airflow rate pre-set for the first heating mode. When determining the heating temperature, the ventilation mode is determined if it is determined that the abnormal condition has not occurred, while the heating mode is determined if it is determined that the abnormal condition has occurred. When determining the heating temperature of the outside air, the second heating mode is selected when the temperature difference is greater than a preset temperature threshold and the required airflow is greater than a preset airflow threshold, while the first heating mode is selected when the temperature difference is less than or equal to the temperature threshold or the required airflow is less than or equal to the airflow threshold. In the heating mode, both the ventilation heat exchanger and the refrigerant heat exchanger of the supply device are operated based on the heating temperature. A room temperature control method in which, in the ventilation mode, only the ventilation heat exchanger of the supply device is operated based on the heating temperature.

2. The above-mentioned room temperature control method, Determine whether the current operating mode is the ventilation mode or the heating mode. When the current operating mode is the heating mode, it is determined whether the current room temperature is above the upper limit of the preset comfortable temperature range. The room temperature control method according to claim 1, wherein, when the current room temperature is above the upper limit of the comfortable temperature range, the heating temperature in the heating mode is set to be equal to or lower than the current heating temperature compared to when the current room temperature is below the upper limit of the comfortable temperature range.

3. A room temperature control device for controlling the supply device in a building having a room, an air conditioning system having a heating function for raising the room temperature, and a supply device that heats the outside air present outside the room by a ventilation heat exchanger that exchanges heat with the indoor air and a refrigerant heat exchanger that exchanges heat with a refrigerant, and supplies the outside air into the room, wherein the supply device is heated by the supply device. An abnormal condition determination unit that determines whether an abnormal condition occurs in which the temperature of the air blown from the air conditioner into the room is below the room temperature during heating operation by the air conditioner, When the abnormal condition determination unit determines that the abnormal condition has occurred, the heating temperature determination unit determines the heating temperature, which is the temperature at which the air is blown into the room from the supply device, based on the temperature difference between the room temperature and the blown air temperature at a predetermined time prior to the determination of the abnormal condition. An output unit that outputs a signal to the supply device for operating the supply device based on the heating temperature, A required airflow calculation unit calculates the required amount of heat required for the air conditioning system and the required airflow required for the supply device based on the temperature difference at the time the temperature difference is detected. It has, The operating modes of the supply device are pre-set to include a ventilation mode and a heating mode having a higher heating temperature compared to the heating temperature in the ventilation mode. The heating mode includes a first heating mode having a first heating temperature as the heating temperature, and a second heating mode having a second heating temperature higher than the first heating temperature. The second heating mode is pre-set to have an airflow rate greater than the airflow rate pre-set for the first heating mode. The heating temperature determination unit determines the ventilation mode when it is determined that the abnormal condition has not occurred, and determines the heating mode when it is determined that the abnormal condition has occurred. The heating temperature determination unit selects the second heating mode when the temperature difference is greater than a preset temperature threshold and the required airflow is greater than a preset airflow threshold, while selecting the first heating mode when the temperature difference is less than or equal to the temperature threshold or the required airflow is less than or equal to the airflow threshold. The output unit is a room temperature control device that, in the heating mode, outputs a signal to the supply device to activate both the ventilation heat exchanger and the refrigerant heat exchanger of the supply device based on the heating temperature, and in the ventilation mode, outputs a signal to the supply device to activate only the ventilation heat exchanger of the supply device based on the heating temperature.

4. The aforementioned room temperature control device is An operating mode determination unit that determines whether the current operating mode is the ventilation mode or the heating mode, The system further includes a comfort temperature determination unit that determines whether the current room temperature is above or below the upper limit of a preset comfort temperature range when the current operating mode is the heating mode. The room temperature control device according to claim 3, wherein the heating temperature specification unit sets the heating temperature in the heating mode to be equal to or lower than the current heating temperature when the current room temperature is above the upper limit of the comfortable temperature range, compared to when the current room temperature is below the upper limit of the comfortable temperature range.

5. A program implemented in a room temperature control device that controls the supply device in a building having a room, an air conditioning system having a heating function for raising the room temperature, and a supply device that heats the outside air present outside the room by a ventilation heat exchanger that exchanges heat with the indoor air and a refrigerant heat exchanger that exchanges heat with a refrigerant and supplies the outside air into the room, the program being implemented in the room temperature control device, An abnormal condition determination unit that determines whether an abnormal condition occurs in which the temperature of the air blown from the air conditioner into the room is below the room temperature during heating operation by the air conditioner, When the abnormal condition determination unit determines that the abnormal condition has occurred, the heating temperature determination unit determines the heating temperature, which is the temperature at which the air is blown into the room from the supply device, based on the temperature difference between the room temperature and the blown air temperature at a predetermined time prior to the determination of the abnormal condition. An output unit that outputs a signal to the supply device for operating the supply device based on the heating temperature, A required airflow calculation unit calculates the required amount of heat required for the air conditioning system and the required airflow required for the supply device based on the temperature difference at the time the temperature difference is detected. Then the room temperature control device is made to function, The operating modes of the supply device are pre-set to include a ventilation mode and a heating mode having a higher heating temperature compared to the heating temperature in the ventilation mode. The heating mode includes a first heating mode having a first heating temperature as the heating temperature, and a second heating mode having a second heating temperature higher than the first heating temperature. The second heating mode is pre-set to have an airflow rate greater than the airflow rate pre-set for the first heating mode. The heating temperature determination unit determines the ventilation mode when it is determined that the abnormal condition has not occurred, and determines the heating mode when it is determined that the abnormal condition has occurred. The heating temperature determination unit selects the second heating mode when the temperature difference is greater than a preset temperature threshold and the required airflow is greater than a preset airflow threshold, while selecting the first heating mode when the temperature difference is less than or equal to the temperature threshold or the required airflow is less than or equal to the airflow threshold. The output unit is a program that, in the heating mode, outputs a signal to the supply device to activate both the ventilation heat exchanger and the refrigerant heat exchanger of the supply device based on the heating temperature, and in the ventilation mode, outputs a signal to the supply device to activate only the ventilation heat exchanger of the supply device based on the heating temperature.

6. A room temperature control system installed in a building having rooms, An air conditioning system having a heating function for raising the room temperature, A supply device that heats the outside air present outside the room and supplies the outside air into the room, A room temperature control system comprising a room temperature control device according to claim 3 or 4 for controlling the supply device.

7. The aforementioned room temperature control system, The room temperature control system according to claim 6, wherein the supply device comprises an introduction passage for introducing outside air into the room, an outlet passage for introducing air from the room to the outside, a ventilation heat exchanger that heats the air in the introduction passage by performing heat exchange between the air in the outlet passage and the air in the introduction passage, and a refrigerant heat exchanger that heats the air in the introduction passage by performing heat exchange between the refrigerant and the air in the introduction passage.

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