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

Abstract

This air conditioning system contributes to SDGs, carbon neutrality, and green innovation by effectively controlling the temperature and humidity of a room within the set range with minimal energy consumption. [Solution] The temperature and humidity inside the living room 110 are measured by the temperature and humidity detector 160 and input to the temperature control device 150. The temperature control device 150 calculates a temperature set value from the room's temperature and humidity values, within a predetermined control range, such that the specific enthalpy is set to the set value, and outputs this to the air conditioner 120. As a result, the air conditioner 120 adjusts the temperature of the air inside the living room 110 based on the input temperature set value. Specific enthalpy can be thought of as the amount of heat contained in the indoor air, and the air conditioning operation is performed so that this value remains constant.

Description

Technical Field

[0001] The present invention relates to an air conditioning system, an air conditioning program, and an air conditioning method, and particularly relates to an improvement of an air conditioning method suitable for saving energy required for air conditioning.

Background Art

[0002] As the background art of an air conditioning method for the purpose of energy saving, for example, there is "Temperature and Humidity Control System and Temperature and Humidity Control Method" described in Patent Document 1 below. This sets a range (allowable range) of ±2°C and ±10%RH with respect to the reference setting of the temperature and humidity in the building interior room to be air-conditioned (for example, 24°C, 50%RH) as a setting zone S, and determines target value determination zones Z1 to Z6 around this setting zone S. Then, according to the target value determination zone where the outside air conditions are located, the indoor temperature set value and the indoor humidity set value are determined as the set points in the setting zone S where the processing heat quantity is considered to be the smallest. The temperature and humidity of the supply air to the air conditioning control target room are controlled so that the indoor temperature and the indoor humidity match the determined indoor temperature set value and indoor humidity set value.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in the background art described in Patent Document 1 mentioned above, the target value determination zone changes depending on the temperature and humidity of the outside air. Therefore, even if the temperature and humidity according to the outside air conditions are set in the setting zone where the processing heat quantity is the smallest, there is a disadvantage that ambiguity occurs in the set value, and as a result, control with the smallest processing heat quantity is not always performed.

[0005] This invention has been made in view of the above problems, and its purpose is to reduce energy consumption while maintaining comfort. [Means for solving the problem]

[0006] The present invention provides an air conditioning means for performing air conditioning in a living room so that the temperature and humidity in the living room are within a predetermined control range; a temperature control means for controlling the air conditioning means so that the specific enthalpy is a target value determined based on the target temperature and humidity in the living room; and a temperature and humidity detection means for detecting the temperature and humidity in the living room. The temperature control means determines a set temperature for the air conditioning means from the target specific enthalpy and the measured temperature and humidity in the living room detected by the temperature and humidity detection means, and the air conditioning means controls the temperature in the living room so that it reaches the set temperature.

[0007] Another invention is characterized in that, when the air conditioning means is composed of an outdoor unit and an indoor unit, the air conditioning means includes a temperature control means for controlling the outdoor unit so that the specific enthalpy of the outdoor unit becomes a target value determined based on the target value of the temperature and humidity of the room in the outdoor unit, and a temperature and humidity detection means for detecting the temperature and humidity on the supply air side of the outdoor unit, wherein the temperature control means determines a set temperature for the air conditioning means from the target value of the specific enthalpy and the measured value of the temperature and humidity detected by the temperature and humidity detection means, and the air conditioning means controls the temperature on the supply air side of the outdoor unit to the room so that the set temperature is achieved.

[0008] According to the present invention, a target value for specific enthalpy is determined from the target values ​​of temperature and humidity of the air to be controlled, and the temperature of the room or the temperature of the supply air introduced into the room is controlled to achieve this target value, thereby resulting in a constant specific enthalpy. Specific enthalpy can be considered as the amount of heat contained in the room air, and the air conditioning operation is performed in such a way as not to change it. The aforementioned and other objectives, features, and advantages of the present invention will become clear from the following detailed description and accompanying drawings. [Effects of the Invention]

[0009] According to the present invention, a target value for specific enthalpy is determined from the target values ​​for temperature and humidity of the air to be controlled, and the temperature of the room or the temperature of the supply air introduced into the room is set and controlled to achieve this target value. As a result, energy consumption can be reduced while maintaining comfort. [Brief explanation of the drawing]

[0010] [Figure 1] This figure shows the main components of the air conditioning system according to Embodiment 1 of the present invention. [Figure 2] This figure shows the control process during air conditioning in the room according to the above embodiment 1. [Figure 3] This figure shows the control process during heating of the room in the above-described embodiment 1. [Figure 4] This diagram shows the main operation of the above embodiment 1. [Figure 5] This figure shows the main components of the air conditioning system according to Embodiment 2 of the present invention. [Figure 6] This figure shows the control of the air handling unit during cooling operation in the above embodiment 2. [Figure 7] This figure shows the control of the air conditioning unit during heating in the above embodiment 2. [Figure 8] This figure shows the main part of Embodiment 3 of the present invention and its operation. [Modes for carrying out the invention]

[0011] The best mode for carrying out the present invention will be described in detail below based on examples. [Examples]

[0012] First, Embodiment 1 of the present invention will be described with reference to Figures 1 to 4. Figure 1 shows the main configuration of the air conditioning system 100 of this embodiment, and is an example of a central air conditioning system for a building, showing one of many rooms in the building. Also, the boiler and chiller that serve as heat sources are shown together as the air conditioner. In the figure, the room 110 to be air-conditioned or controlled by the air conditioning system 100 is provided with an air supply port 112 and a return air port 114, and the temperature and humidity inside the room 110 are controlled by the air supplied from the air supply port 112.

[0013] The air conditioner 120 is equipped with an air cooling / heating device (hereinafter referred to as "cooling / heating device") 128, which functions as a heat source for supplying air to the living room 110. A fan 122 sends conditioned air to the air intake 112 of the living room 110 via an air supply duct 130. In addition, air returned from the return air intake 114 of the living room 110 is returned to the air intake 124 of the air conditioner 120 via a return air duct 132, and some of it is exhausted from the exhaust port 134. Outside air introduced from the outside air inlet 136 is also taken into the air conditioner 120 through the air intake 124. The air conditioner 120 is also equipped with a humidifier 126. The air conditioner 120 adjusts the temperature and humidity of the returned air or outside air drawn in from the air intake 124 and supplies it to the living room 110, thereby providing air conditioning to the living room 110.

[0014] In this embodiment, a temperature control device 150, a temperature and humidity detector 160 for measuring dry-bulb temperature and relative humidity, and a humidity controller (humidity regulator) 170 are provided. Of these, the temperature and humidity detector 160 is an indoor-installed type and measures the dry-bulb temperature and relative humidity in the living room 110. In the following description, "dry-bulb temperature" will be simply referred to as "temperature," and "relative humidity" will be simply referred to as "humidity."

[0015] Next, temperature control data 152 is pre-stored in the temperature control device 150, and a temperature calculation unit 154 and a temperature control unit 156 are provided. The temperature calculation unit 154 calculates set data to be controlled based on the temperature control data 152 and the detection results of the temperature and humidity detector 160, and based on this calculation result, the operation of the air conditioner 120 is controlled by the temperature control unit 156. These temperature calculations and temperature controls are realized, for example, as data and programs of a computer system.

[0016] The temperature control data 152 includes, for example, a, the specific enthalpy target value, b, the upper limit value of the indoor temperature setting, c, the lower limit value of the indoor temperature setting. is included. Specifically described, in this embodiment, it is set corresponding to each operation mode of cooling and heating, and is preset so as to be within the indoor environment standard (building environmental sanitation management standard). Specifically, a, during cooling: temperature 28°C or lower, humidity 70% or lower b, during heating: temperature 18°C or higher, humidity 40% or higher is defined, so the control range is set so as to be within this range. For example, a, during cooling: temperature 25 - 28°C, humidity 70% or lower b, during heating: temperature 18 - 22°C, humidity 40% or higher is the case. In actual operation, it is necessary to consider the latent heat in the living room 110. However, in the embodiment, for easy understanding, the sensible heat ratio is set to 1. Also, since it may not be as set due to control errors, it is also necessary to set a specific enthalpy target value with a margin to keep it within the indoor environment standard.

[0017] And in the temperature control device 150, the target indoor temperature and humidity (target value) are further determined within the above control range. For example, a, the target indoor temperature and humidity during cooling: temperature 25°C, humidity 70% b, the target indoor temperature and humidity during heating: 18°C, humidity 40% And so on. Once these target values ​​for indoor temperature and humidity are determined, the target value for specific enthalpy is determined from the psychrometric chart. In the above case, c. Target specific enthalpy value during cooling: 60.6 kJ / kg d. Target specific enthalpy value during heating: 31.1 kJ / kg This is the result. In actual operation, it is necessary to consider the latent heat within the living space 110, but in this embodiment, for the sake of clarity, the sensible heat ratio is set to 1. Also, because control errors may cause the system to not perform as intended, it is necessary to set a specific enthalpy target value with a margin of safety in order to stay within indoor environmental standards.

[0018] On the other hand, the humidity controller 170 has humidity control data 172 stored in advance, and, like the temperature control device 150, is provided with a humidity calculation unit and a humidity control unit (not shown). Based on the humidity control data 172 and the humidity detection results from the temperature and humidity detector 160, the humidity calculation unit controls the operation of the humidifier 126 via the humidity control unit. These humidity calculations and humidity controls are also implemented, for example, as data and programs in a computer system. Examples of humidity control data 172 include: a. During heating: Humidity 40% In this manner, appropriate target values ​​are set. Alternatively, the function of the humidity controller 170 may be handled by the temperature control device 150. In this case as well, control errors may cause the settings to not be accurate, so it is necessary to set a humidity value with a margin of safety in order to stay within indoor environmental standards. For example, if the humidity during humidification is set to 50% and humidification is performed frequently, the heat of vaporization of the humidified water will lower the supply air temperature. As a result, the energy required to maintain the supply air temperature at the set value will increase, which is contrary to energy saving, so in this embodiment, the humidity is set to 40%.

[0019] Figure 2 shows how the control range is set during cooling. a. The temperature control range is determined by the temperature range of 25-28°C on the horizontal axis of the psychrometric chart. b. When the target indoor temperature and humidity during cooling is 25°C and 70% humidity (see Pg), the target specific enthalpy value becomes 60.6 kJ / kg. c. The relative humidity is 70% at the intersection of the graph for the target relative enthalpy of 60.6 kJ / kg and the temperature of 25°C, and 53% at the intersection of the graph for 28°C, so the humidity control range is 70-53%. Note that absolute humidity (vertical axis of the psychrometric chart) may be used instead of relative humidity (curve of the psychrometric chart). Absolute humidity can be determined from temperature and relative humidity, and in the example in Figure 2, it is 0.00128-0.00142 kg / kg.

[0020] As described above, when using air conditioning, (1) Temperature 25~28℃ (2) Humidity 53-70% (absolute humidity 0.00128-0.00142 kg / kg) (3) Specific enthalpy 60.6 kJ / kg This is saved as temperature control data 152 or humidity control data 172.

[0021] Then, the temperature calculation unit 154 performs calculations so that the specific enthalpy reaches the target value, and based on this calculation result, the temperature control unit 156 controls the temperature of the air conditioner 120. In other words, it adjusts the temperature of the air supplied from the supply air duct 130 to the living room 110. In addition, humidity is adjusted by the natural dehumidification that occurs during the process of cooling the supply air into the room with the air conditioner.

[0022] An example of the calculation of the aforementioned temperature setpoint (Handbook of Air Conditioning and Sanitary Engineering) is shown below: When h is the specific enthalpy (kJ / kg), Td is the temperature setpoint (°C), and χ is the absolute humidity (kg / kg), from the relationship between them, h = 1.006Td + (1.86Td + 2501)χ h = 1.006Td + 1.86Tdχ + 2501χ h-2501χ = 1.006Td + 1.86Tdχ Td = (h - 2501χ) / (1.006 + 1.86χ) It is required as such.

[0023] For example, in the dotted line case during cooling operation shown in Figure 2, the absolute humidity calculated from the temperature and humidity detected by the temperature and humidity detector 160 in the living room 110 is 0.0135 kg / kg (see PA). From the intersection with the target specific enthalpy of 60.6 kJ / kg (see PB), the indoor temperature set value is 26°C (see PC). Therefore, the temperature control device 150 controls the temperature in the living room 110 to achieve this indoor temperature set value. Furthermore, if the indoor relative humidity reaches 70%, the indoor temperature set value is lowered to 25°C from the intersection with the target specific enthalpy of 60.6 kJ / kg (see Pg). By lowering the indoor temperature set value in this way, a decrease in humidity due to natural dehumidification can be expected, and comfort can be maintained.

[0024] Generally, even when the room is hot and humid, the air conditioning may turn off. Possible solutions include: (1) Lower the set temperature when using the air conditioner for cooling (automatic dehumidification). Air conditioners typically perform dehumidification in conjunction with cooling, but the mechanism is the same even when dehumidification is performed independently. Therefore, lowering the cooling temperature setting can increase the amount of dehumidification. However, in recent years, setting the room temperature to 28°C has been recommended as an energy-saving measure. For this reason, simply lowering the temperature setting is effective as a temporary measure against the heat, but continuing it for a long period of time is not sufficient as an energy-saving measure. (2) Use a reheat dehumidifying air conditioner. This method involves cooling and dehumidifying the indoor air, then warming the air that has become too cold and returning it to the room. However, this method consumes a lot of power during reheating, making it unsuitable as an energy-saving measure.

[0025] However, according to this embodiment, the set temperature is automatically changed according to the absolute humidity in the room. Therefore, without performing energy-intensive reheat dehumidification, the temperature setting is lowered only when the humidity is high, and when the humidity is low, the temperature setting is automatically changed to stay within the target relative enthalpy line, making it possible to achieve both comfort and energy savings.

[0026] Figure 3 shows how the control range is set during heating. a. The temperature range for temperature control is determined by the temperature range of 18-22°C on the horizontal axis of the psychrometric chart. b. With a target indoor temperature of 18°C ​​and a target humidity of 40% during heating (see Pg), the target specific enthalpy is 31.1 kJ / kg. c. The relative humidity is 40% at the intersection of the graph for the target relative enthalpy of 31.1 kJ / kg and the temperature of 18°C, and 20% at the intersection of the graph for 22°C, so the humidity control range is 40-20%. Note that absolute humidity (vertical axis of the psychrometric chart) may be used instead of relative humidity (curve of the psychrometric chart). Absolute humidity can be determined from temperature and relative humidity, and in the example in Figure 3, it is 0.0035-0.0056 kg / kg.

[0027] As described above, during heating, (1)Temperature 18~22℃ (2) Humidity 20-40% (absolute humidity 0.0035-0.0056 kg / kg) (3) Specific enthalpy 31.1 kJ / kg This is saved as temperature control data 152 or humidity control data 172. The temperature calculation unit 154 then performs a calculation so that the specific enthalpy becomes the target value, and based on this calculation result, the temperature control unit 156 controls the temperature of the air conditioner 120. That is, it adjusts the temperature of the air supplied from the supply air duct 130 to the living room 110. In addition, the humidity controller 170 adjusts the humidity using the humidifier 126. However, this control range does not fall within the environmental standard of humidity of 40% or more as described above. Therefore, in this embodiment, humidification is performed in the region R3A where the humidity is less than 40%, as shown in Figure 3. That is, the condition in (2) above becomes humidity of 40%. Furthermore, in actual operation, the humidifier 126 may not perform as intended due to its capacity and control errors. Therefore, in order to stay within indoor environmental standards, it is necessary to set a specific enthalpy target value with a margin of safety.

[0028] For example, in the dotted line case during heating operation shown in Figure 3, the absolute humidity calculated from the temperature and humidity detected by the temperature and humidity detector 160 in the living room 110 is 0.0043 kg / kg (see PA). From the intersection with the target specific enthalpy of 31.1 kJ / kg (see PB), the set value for the room temperature is 20°C (see PC). Therefore, the temperature control device 150 controls the temperature in the living room 110 to achieve this set value.

[0029] In addition, if the absolute humidity of the supply air exceeds 0.0051 kg / kg (see PD), the indoor relative humidity can be kept above 40% by lowering the temperature setting to 18°C ​​(see Pg), and if it falls below that, the indoor heat can be kept above a certain level (constant specific enthalpy) by raising the temperature setting, while also improving the efficiency of the humidifier 126.

[0030] Next, the overall operation of this embodiment will be explained with reference to Figure 4. Figure 4 shows the overall operation procedure of the air conditioning system 100 of this embodiment. In the example shown in the figure, the operating mode is: a. Manual operation mode in which the user inside the living room 110 sets the temperature and humidity values ​​of the room. b. Automatic driving mode considering specific enthalpy according to the present invention, There are two modes, and one of them is selected when operating the air conditioning system (step SA). When manual operation mode is selected, the air conditioner 120 is operated so that the temperature and humidity inside the room 110 are set by the user (for example, temperature 26°C, humidity 50%) (step SB). This operation is well known in general air conditioning systems.

[0031] Next, when the automatic operation mode is selected, the control range described above is set according to whether cooling or heating is to be performed (step SC) (steps SD, SE). The switching between cooling and heating is performed, for example, seasonally. Next, the temperature and humidity inside the living room 110 are measured by the temperature and humidity detector 160 (step SF), and these are input to the temperature control device 150. The temperature control device 150 then refers to the temperature control data 152, and the temperature calculation unit 154 calculates the temperature inside the living room 110 so that the temperature inside the living room 110 is within the set temperature range and the specific enthalpy is the target value (step SG). Based on this calculation result, the temperature control unit 156 controls the cooling and heating inside the living room 110 by the air conditioner 120 (step SH). By repeating these operations, the temperature inside the living room 110 is controlled or adjusted to a preset target specific enthalpy and a set temperature value. As mentioned above, humidification is performed during heating in the region R3A, where the humidity is less than 40%, as shown in Figure 3.

[0032] As described above, the temperature and humidity in the living room 110 are controlled within the control range shown in Figures 2 and 3, so that the specific enthalpy reaches the target value. In other words, the specific enthalpy in the living room 110 is maintained at a constant target value. Specific enthalpy can be considered as the amount of heat contained in the indoor air, and the air conditioning operation is performed in such a way that it does not change. Compared to conventional manual operation (step SB), this embodiment results in a deviation of temperature and humidity from the target value, but it still remains within environmental standards, and the energy-saving effect of controlling the specific enthalpy to a constant target value is obtained.

[0033] Furthermore, even if the temperature is changed within a predetermined range, such as raising the temperature setting during the cooling season and lowering it during the heating season, the amount of heat in the air remains constant as long as the specific enthalpy is constant. From this point of view, energy conservation can be achieved, and the quality of the air conditioning environment can be quantified. In air conditioning systems, especially in building air conditioning, it is known that simply lowering the indoor temperature by 1°C can result in an energy saving effect of approximately 10% (Kanto Bureau of Economy, Trade and Industry, "How to Promote Energy Saving and Useful Points for On-Site Practices," 2020), and by applying the present invention, a significant energy saving effect can be expected. According to this embodiment, the target value of specific enthalpy is determined from the target values ​​of temperature and humidity of the air to be controlled, and the temperature in the living space is set and controlled to achieve this target value. This allows for reduced energy consumption while maintaining comfort, contributing to SDGs, carbon neutrality, or green innovation. [Examples]

[0034] Next, with reference to Figures 5 to 7, Embodiment 2 of the present invention will be described. In the above embodiment, the temperature of a room to be air-conditioned was controlled, but in this embodiment, the temperature of the air that has been first treated from outside air introduced into the room is controlled. Figure 5 shows the main configuration of the air conditioning system 200 of this embodiment, and is an example of applying the present invention to an air conditioning system equipped with an outdoor air handling unit and an indoor unit, showing one of many rooms in a building. In the figure, the room to be air-conditioned 210 is provided with an air supply port 212, a fan 214, and an indoor unit 280. Various known types of indoor units 280 are applied, such as the FCU (fan coil unit) type and the PAC (packaged air conditioner) type. The temperature and humidity inside the room 210 are adjusted by the air supplied from the air supply port 212 and the air conditioning operation by the indoor unit 280, and the air is exhausted from the exhaust duct 216 and exhaust port 234 by the fan 214.

[0035] The air handling unit 220 is equipped with an air cooling / heating device (hereinafter referred to as "cooling / heating device") 228, and functions as a heat source for supplying air to the living room 210. It takes in outside air from the outside air inlet 236 and humidifies it as needed with a humidifier 226. The conditioned air is then supplied by a fan 222 from the supply air duct 230 to the air inlet 212 of the living room 210.

[0036] In this embodiment, an indoor control unit 282 is provided in the indoor unit 280 of the living room 210. The indoor control unit 282 calculates a control signal based on the indoor temperature and humidity detected by the indoor-installed temperature and humidity detector 284, and controls the operation of the indoor unit 280. The setting of the control range and operation of the indoor unit 280 by the indoor control unit 282 and the indoor-installed temperature and humidity detector 284 are the same as in Embodiment 1 described above.

[0037] On the other hand, the air handling unit 220 is equipped with a temperature control device 250 and a humidity detector 260, a temperature detector 262, and a temperature and humidity detector 264 for measuring dry-bulb temperature and relative humidity. All of these are duct-insertion type. The humidity detector 260 measures the relative humidity in the exhaust duct 216 and outputs it to the humidity controller 270. The temperature detector 262 measures the dry-bulb temperature in the supply air duct 230 for supply air temperature control and outputs it to the temperature control device 250. The temperature and humidity detector 264 measures the dry-bulb temperature and relative humidity in the air before humidification (in front of the humidifier 226) for calculating absolute humidity and outputs it to the temperature control device 250. In the above case, the humidifier 226 is controlled by the exhaust humidity, but it is also possible to control the humidifier 226 by the indoor humidity. In the case of using a steam humidifier, it is also possible to perform proportional control of the humidifier 226 by the supply air dew point temperature or the supply air absolute humidity.

[0038] The temperature control device 250 has temperature control data 252 stored in advance and is equipped with a temperature calculation unit 254 and a temperature control unit 256. The temperature calculation unit 254 calculates control data based on the temperature control data 252 and the detection results of the temperature detector 262 and the temperature and humidity detector 264, and based on this calculation result, the temperature control unit 256 outputs a temperature control signal to the air handling unit 220, thereby controlling the operation of the air handling unit 220. These can be implemented, for example, as data and programs in a computer system.

[0039] In the temperature control device 250, the supply temperature and humidity from the air handling unit 220 to the living room 210 are set, for example, as follows, and stored as temperature control data 252. a. When using air conditioning: Temperature 19-28°C, humidity 70% or less. b. During heating: Temperature 18-24℃, humidity 40% or higher And so on. Furthermore, the temperature control device 250 sets target supply temperature and humidity within the above control range. For example, a. Target temperature and humidity during cooling: Dew point temperature of 19°C to achieve a temperature of 25°C and humidity of 70%. b. Target temperature and humidity during heating: Temperature 18°C, Humidity 40% And so on. Once these target values ​​for supply temperature and humidity are determined, the specific enthalpy can be determined from the psychrometric chart.

[0040] On the other hand, the humidity controller 270 has humidity control data 272 stored in advance, and, like the temperature control device 250, is provided with a humidity calculation unit and a humidity control unit (not shown). The humidity calculation unit calculates the set value of the humidity to be controlled based on the humidity control data 272 and the humidity detection result from the humidity detector 260, and based on this calculation result, the humidity control unit controls the operation of the humidifier 226. These humidity calculations and humidity controls are also implemented, for example, as data and programs in a computer system. Examples of humidity control data 272 include: a. When using air conditioning: Humidity 70% b. During heating: Humidity 40% In this manner, appropriate target values ​​are set. Alternatively, the function of the humidity controller 270 may be handled by the temperature control device 250.

[0041] Figure 6 shows how the control range is set during cooling. a. As mentioned above, the supply air temperature from the outdoor air handling unit 220 to the living room 210 is set to 19-28°C during cooling, so the temperature control range is determined by the temperature of 19-28°C on the horizontal axis of the psychrometric chart. b. Target temperature and humidity: In this embodiment, the target value for the supply air temperature is set to a specific enthalpy of 54.1 kJ / kg, based on the dew point temperature of 19.0°C under indoor temperature and humidity conditions of 25°C and 70% (see Pg). c. At the intersection of the graph for the target specific enthalpy of 54.1 kJ / kg and the temperature of 19°C, the absolute humidity is 0.0138 kg / kg, and at the intersection for the temperature of 28°C, the absolute humidity is 0.0102 kg / kg. In this embodiment, the air handling unit 220 is controlled by the temperature control device 250 so that the specific enthalpy of the supply air supplied from the air handling unit 220 to the living room 210 is the target value. At that time, the supply air temperature is controlled so that the relative humidity of the supply air from the air handling unit 220 to the living room 210 does not exceed 70% at a room temperature of 25°C, based on the dew point temperature. In actual operation, it is necessary to consider the latent heat within the living space 210, but in this embodiment, the sensible heat ratio is set to 1 for simplicity. Also, because control errors may cause the system to not perform as intended, it is necessary to set a specific enthalpy target value with a margin of safety in order to stay within indoor environmental standards.

[0042] As described above, when using air conditioning, (1)Temperature 19~28℃ (2) Specific enthalpy 54.1 kJ / kg (3) Humidity 43-100% (Absolute humidity 0.0102-0.0138 kg / kg) (4) However, the supply air temperature will be the dew point temperature when the room temperature is 25°C and the relative humidity is 70%. This is saved as temperature control data 252 or humidity control data 272.

[0043] Then, the temperature calculation unit 254 performs calculations so that the specific enthalpy becomes the target value, and based on this calculation result, the temperature control unit 256 controls the temperature of the air handling unit 220. In other words, it adjusts the temperature of the air supplied from the air supply duct 230 to the living room 210. In addition, the humidity controller 270 adjusts the humidity using the humidifier 226.

[0044] For example, in the case shown by the dotted line in Figure 6, the calculated value (or measured absolute humidity) from the temperature and humidity detected by the temperature and humidity detector 264 in front of the humidifier is 0.011 kg / kg (see PA). From the intersection with the target specific enthalpy of 54.1 kJ / kg (see PB), the set value for the indoor temperature becomes 26°C (see PC). Therefore, the temperature control device 250 controls the temperature of the air supplied from the air supply duct 230 to the living room 210 so that the indoor temperature reaches this set value.

[0045] Figure 7 shows how the control range is set during heating. a. As mentioned above, the temperature of the air supplied from the outdoor air handling unit 220 to the living room 210 is set to 18-24°C during heating, so the temperature control range is determined by the "18-24°C" range on the horizontal axis of the psychrometric chart. b. Based on the above-mentioned standard indoor temperature and humidity: temperature 18°C, humidity 40% (see Pg), the target specific enthalpy value is 31.1 kJ / kg. c. At the intersection of the graph with a specific enthalpy target value of 31.1 kJ / kg and the temperature of 18°C, the absolute humidity is 0.0054 kg / kg, and at the intersection with the temperature of 24°C, the absolute humidity is 0.003 kg / kg (relative humidity 16%). In this embodiment, the air handling unit 220 is controlled by the temperature control device 250 so that the specific enthalpy of the supply air supplied from the air handling unit 220 to the living room 210 is the above target value.

[0046] For example, in the case shown by the dotted line in Figure 7, the absolute humidity calculated from the temperature and humidity measured by the temperature and humidity detector 264 prior to the humidifier is 0.0035 kg / kg (see PA). From the intersection with the specific enthalpy target value of 31.1 kJ / kg (see PB), the set value for the supply air temperature is 22°C (see PC). To achieve this set value, the air supplied from the supply air duct 230 to the air inlet 212 of the living room 210 is measured by the duct-inserted temperature detector 252 and the temperature is controlled. The humidity controller 270 adjusts the humidification by the humidifier 226 based on the measurement value from the duct-inserted humidity detector 260. In Figure 7, region R7A indicates the region humidified by the humidifier 226 at a temperature of 18-24°C and a humidity of 40%.

[0047] As described above, when heating, (1) Temperature 18~24℃ (2) Specific enthalpy 31.1 kJ / kg (3) Humidity 16-40% (Absolute humidity 0.003-0.0054 kg / kg) To that end, the temperature control device 250 performs calculations for control data, and based on the results of these calculations, the temperature of the air handling unit 220 is controlled so that the specific enthalpy reaches the target value.

[0048] In particular, if the absolute humidity of the supply air in the supply air duct 230 exceeds 0.0051 kg / kg, energy efficiency is improved by lowering the supply air temperature setting to 18°C. If it falls below this level, humidification efficiency is improved by maintaining the heat content of the supply air, i.e., the specific enthalpy, above a certain level, and raising the supply air temperature setting according to the absolute humidity before the humidifier.

[0049] Next, the overall operation of this embodiment will be explained. The selection of the operating mode shown in Figure 4 and the setting of target values ​​by the user in the room are the same as in Embodiment 1 described above. When the automatic operation mode is selected, the following operations are performed. That is, during cooling, a. In the outdoor air handling unit 220, the temperature of the air supplied from the supply air duct 230 to the air inlet 212 of the living room 210 is set based on the calculation results of the temperature control device 250 so that the specific enthalpy reaches the target value. In the example of Figure 6 during cooling, the specific enthalpy target value is 54.1 kJ / kg, and in the example of Figure 7 during heating, the specific enthalpy target value is 31.1 kJ / kg. b. In the indoor unit 280, air conditioning of the living room 210 is performed based on the calculation results of the indoor control unit 282 so that the indoor temperature reaches the target value. In the example in Figure 2 for cooling, the indoor temperature is set to 25°C or higher, and in the example in Figure 3 for heating, the indoor temperature is set to 18°C ​​or higher, thereby meeting the indoor environmental standards while minimizing the amount of humidification.

[0050] As described above, according to this embodiment, the specific enthalpy of the air handling unit 220 is controlled to reach the target value, and outside air is introduced without changing the amount of heat contained in the air. Except for the specific enthalpy that increases due to humidification necessary to maintain humidity during heating, the specific enthalpy of the air supplied from the air handling unit 220 into the living room 210 hardly changes, and unnecessary dehumidification and humidification are minimized, thereby reducing the consumption of excess energy. [Examples]

[0051] Next, with reference to Figure 8, Embodiment 3 of the present invention will be described. This embodiment aims to further save energy by adjusting the start-up or stop-down time of the air conditioner according to the heating and cooling load. The basic concept of optimal start-up and stop-down of the air conditioner is described in detail, for example, in the Energy Conservation Center Foundation's "FY2007 Energy Conservation Measures Promotion Project for Commercial Buildings, New Edition Energy Conservation Tuning Manual," pp. 91-95 (published March 2008).

[0052] In this embodiment, as shown in Figure (A), an optimal start / stop control unit 500 is added to the temperature control device 150 of Embodiment 1 described above. This optimal start / stop control unit 500 starts or stops the device earlier than the start / stop times according to a preset schedule, by referring to the specific enthalpy in the room. This operation is also executed as a computer program.

[0053] First, referring to Figure (B), let's explain from the startup process: a) Initially, the air conditioner is started ahead of schedule so that the room temperature reaches the target temperature at the start time based on a pre-set schedule, and the specific enthalpy of the room in the past is calculated. b. Next, the operating time required for the past specific enthalpy of the room obtained by the above calculation to reach an acceptable specific enthalpy at the start of use of the room is learned (step S10). c. Next, the operating time required for the advance operation is calculated from the specific enthalpy inside the room prior to the permitted advance operation time on the day, and the start time of operation is determined (step S12). d. Next, the start time of operation determined in c above is compared with the earlier start time of the schedule, and the shorter earlier start time is adopted (step S14). e. Next, when the adopted accelerated start time arrives, the accelerated start operation is initiated (step S16). f. Subsequently, the system is operated with the target specific enthalpy constant as described above.

[0054] Next, referring to Figure (C), the stopping state will be explained. a) Initially, the air conditioner is shut off ahead of schedule to stop at a predetermined time, and the specific enthalpy of the room in the past is calculated. b. Next, the operating time required for the past specific enthalpy of the room obtained by the above calculation to reach an acceptable specific enthalpy when the room is shut down is learned (step S20). c. Next, the possible early shutdown time is calculated from the specific enthalpy inside the vehicle prior to the scheduled early shutdown time on the day, and the operating shutdown time is determined (step S22). d. Next, the operating stop time determined in (3) above is compared with the earlier stop time in the schedule, and the shorter earlier stop time is adopted (step S24). e. Next, when the adopted accelerated stop time arrives, the accelerated stop operation is started (step S26).

[0055] These measures allow for limiting the time during which pre-start operation is possible in optimal start-up and stop-down. During pre-start-up and stop-down operation, depending on the usage status of the air conditioner 120, it becomes possible to prohibit humidification or, if outside air cooling is ineffective, to perform air conditioning operation using only return air without introducing outside air. Such optimal start-up and stop-down control may also be applied to the other embodiments described above.

[0056] <Other Embodiments> The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention. For example, the following are also included. (1) There are various types of building air conditioning systems, such as central air conditioning systems and individual air conditioning systems, and the present invention is applicable to all of them. It is also applicable to air conditioning systems for general households. (2) The configuration of the air conditioning system shown in the above embodiment is just one example, and various known configurations may be used. For example, in the above embodiment, the temperature control device and the humidity controller were configured separately, but they may be configured as a single unit to form a temperature and humidity control device, or they may be separated into a temperature control device and a humidity control device. (3) The values ​​for temperature, humidity, etc. shown in the above examples are just examples and will vary depending on the use of the room, the surrounding environment, and the operating method. The above examples use a relative humidity of 40% to 70%, which is the minimum requirement for the environmental conditions of the Building Sanitation Act, as a standard, but settings may be adjusted according to the situation. (4) In the above embodiments, the explanation was mainly given in terms of dry-bulb temperature and relative humidity, but it is also possible to consider absolute humidity on the vertical axis of the psychrometric chart. In particular, instead of temperature and humidity detectors 160 and 264, an absolute humidity detector may be used to detect absolute humidity. (5) In the above embodiment 2, the absolute humidity is calculated using the temperature and humidity detector 264 inside the air handling unit 220, but the value of the outside temperature and humidity detector 266 may also be used.

[0057] (6) When starting the air conditioning, the system may start operation at the upper limit of the set temperature in summer and at the lower limit in winter, and after a predetermined set time has elapsed, control may be initiated so that the specific enthalpy described above becomes the set value. For example, in the cooling example in Figure 6, the temperature control range is 19 to 28°C, but if the outside temperature at the start of operation is, for example, 31°C, a. First, for a certain period of time from the start of operation (pre-cooling and pre-heating time), the outdoor air handling unit 220 is operated until the supply air temperature to the living room 210 reaches 28°C. b. Subsequently, the operation of the air handling unit 220 is controlled so that the specific enthalpy reaches the target value. Alternatively, the time required for pre-cooling and pre-heating is shortened by starting the operation of the air handling unit 220 at the lower limit of the set temperature in summer and at the upper limit in winter. This is how it works. At this time, the upper and lower temperature limits and the pre-cooling and pre-heating time are adjusted as appropriate according to the operating results. The same applies to heating. There are individual differences in how people perceive temperature, and there are two methods for changing the temperature setting in response to requests for being too hot or too cold during air conditioning. One method is to change the temperature setting by raising or lowering the target value of specific enthalpy, thereby changing the amount of heat in the air, and the other method is to fix the temperature setting to the desired setting and perform air conditioning. (7) In the above embodiment 2, a. If the outdoor air handling unit 220 is used exclusively for heating, the measurement value of the outdoor temperature and humidity sensor 266 may be used instead of the temperature and humidity sensor 264. b. If the outdoor air handling unit 220 is for cooling only, the temperature sensor 262 and the temperature and humidity sensor 264 can be combined into one unit. [Industrial applicability]

[0058] According to the present invention, a target value for specific enthalpy is determined from the target values ​​of temperature and humidity of the air to be controlled, and the temperature of the room or the temperature of the supply air introduced into the room is set and controlled to achieve this target value. As a result, energy consumption can be reduced while maintaining comfort, making it suitable for air conditioning in buildings, factories, and ordinary homes. [Explanation of symbols]

[0059] 100: Air conditioning system 110: Living room 112:Air supply port 114:Return air port 120:Air conditioner 122: Fan 124: Inlet 126: Humidifier 128: Cooling device / heating device 130: Air intake duct 132: Return air duct 134: Exhaust vent 136: Outside air intake 150: Temperature control device 152: Temperature control data 154: Temperature calculation section 156: Temperature Control Unit 160: Temperature and humidity detector 170: Humidity controller 172: Humidity control data 200: Air conditioning system 210: Living room 212:Air supply port 214: Fan 216: Exhaust duct 220: Outside control machine 222: Fan 226: Humidifier 228: Cooling device / heating device 230: Air intake duct 234: Exhaust vent 236: Outside air intake 250: Temperature control device 252: Temperature control data 254: Temperature calculation section 256: Temperature Control Unit 260: Humidity detector 262: Temperature detector 264: Temperature and humidity detector 266: Outdoor temperature and humidity detector 270: Humidity controller 272: Humidity control data 280: Indoor unit 282: Indoor Control Unit 284: Temperature and humidity detector 500: Optimal Start / Stop Control Unit

Claims

1. An air conditioning system that provides air conditioning for living spaces, Air conditioning means that controls the temperature and humidity inside the room so that they fall within a predetermined control range. A temperature control means controls the air conditioning means so that the specific enthalpy is set to a target value determined based on the target temperature and humidity in the room. Temperature and humidity detection means for detecting the temperature and humidity of the room, It is equipped with, The temperature control means determines the set temperature for the air conditioning means from the target value of the specific enthalpy and the measured value of the temperature and humidity in the room detected by the temperature and humidity detection means. The air conditioning system is characterized in that the air conditioning means controls the temperature of the room so that it reaches the set temperature.

2. An air conditioning system that provides air conditioning for living spaces, An air conditioning system comprising an outdoor unit and an indoor unit, which performs air conditioning so that the temperature and humidity of the air supplied from the outdoor unit to the living room are within a predetermined control range. Temperature control means for controlling the air conditioner so that the specific enthalpy of the air conditioner becomes a target value determined based on the target temperature and humidity of the room in the air conditioner, A temperature and humidity detection means for detecting the temperature and humidity on the air supply side of the external air conditioning unit, It is equipped with, The temperature control means determines the set temperature by the air conditioning means from the target value of the specific enthalpy and the measured temperature and humidity detected by the temperature and humidity detection means. The air conditioning system is characterized in that the air conditioning means controls the temperature of the air supply side of the air handling unit to the living room so that the set temperature is achieved.

3. An absolute humidity detection means is provided to detect absolute humidity instead of temperature and humidity detected by the temperature and humidity detection means. The air conditioning system according to claim 1 or 2, characterized in that the temperature control means determines the set temperature by the air conditioning means from the target value of the specific enthalpy and the measured value of absolute humidity detected by the absolute humidity detection means.

4. The air conditioning system according to claim 1 or 2, characterized in that the control range of the air conditioning means is set to different ranges for cooling and heating, and a target value is set in the temperature control means within these ranges.

5. The control range by the aforementioned air conditioning means is When using air conditioning, the temperature should be 28°C or lower, and the relative humidity 70% or lower. During heating, the temperature should be 18°C ​​or higher, and the relative humidity 40% or higher. The air conditioning system according to claim 4, characterized in that it is set to be within a certain range.

6. The temperature control means is provided with an optimal start / stop control unit. The optimal start / stop control unit is The operating time required to reach an acceptable specific enthalpy at the start of use of the living space will be compared to past cases, and a shorter time will be adopted to start the operation of the air conditioner. When stopping operation in a living space, the stopping time required to reach an acceptable specific enthalpy will be compared to past cases, and the air conditioner will be stopped at a shorter time. The air conditioning system according to claim 1 or 2, characterized in that it is the air conditioning system according to claim 1 or 2.

7. A temperature control program executed by the temperature control means described in claim 1, The steps include determining the set temperature for the air conditioning means from the target value of the specific enthalpy and the measured value of the room temperature detected by the temperature and humidity detection means, The steps include controlling the air conditioner so that the temperature in the room reaches the set temperature, A temperature control program characterized by having the following features.

8. A temperature control program executed by the temperature control means described in claim 2, The steps include determining the set temperature by the air conditioning means from the target value of the specific enthalpy and the measured value of the temperature and humidity on the supply air side to the room of the air conditioner detected by the temperature and humidity detection means, The steps include controlling the air handling unit so that the temperature of the air supplied to the room from the air handling unit reaches the set temperature, A temperature control program characterized by having the following features.

9. The temperature control program according to claim 7 or 8, characterized in that the set temperature of the air conditioning means is determined from the absolute humidity measured by the absolute humidity detection means, instead of the temperature and humidity detected by the temperature and humidity detection means.

10. An air conditioning method characterized by performing air conditioning in a living room using the air conditioning system described in claim 1, wherein the setting ranges for temperature and humidity in the living room are set to different ranges for cooling and heating, and the air conditioning in the living room is performed by setting target values ​​for temperature and humidity in the living room so that they fall within these ranges.

11. An air conditioning method characterized by performing air conditioning in a living room using the air conditioning system described in claim 2, wherein the temperature and humidity setting ranges of the outdoor air handling unit are set to different ranges for cooling and heating, and the target values ​​of the temperature and humidity of the outdoor air handling unit are set to fall within these ranges, thereby performing air conditioning in the living room.

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