Air conditioning system, air conditioning program and air conditioning method

Abstract

To provide an air conditioning device capable of contributing to SDGs, carbon neutrality, and green innovation by excellently controlling the temperature and humidity inside a living room to be air-conditioned within a set range with a minimum amount of energy.SOLUTION: A temperature and a humidity in a room 110 are measured by a temperature and humidity detector 152 and are input to a temperature and humidity control device 150. The temperature and humidity control device 150 calculates, based on indoor temperature and humidity values, temperature and humidity control data so that specific enthalpy is within a predetermined control range and reaches a set value, and outputs it to an air conditioner 120. Therefore, the air conditioner 120 adjusts the temperature and humidity of air supplied to the room 110 from an air supply duct 130 based on the input control data. The specific enthalpy can be thought of as an amount of heat possessed by the air in the room, and air conditioning operation is performed so that the specific enthalpy remains constant.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an air conditioning system, and particularly to an improvement in 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 of ±2°C and ±10%RH (allowable range) with respect to the reference setting of the temperature and humidity in the building interior 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 above, the target value determination zone changes according to 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 an inconvenience that ambiguity occurs in the set value, and as a result, control with the smallest processing heat quantity is not always performed.

[0005] The present invention has been made in view of the above problems, and an object thereof is to control the temperature and humidity in a living room to be air-conditioned within a good set range with a minimum amount of energy.

Means for Solving the Problems

[0006] In performing air conditioning in a living room, the present invention is characterized by determining a target value of specific enthalpy based on the target values of temperature and humidity in the living room, and controlling an air conditioner so as to achieve this target value of specific enthalpy. Alternatively, when an indoor unit and an outdoor unit are provided, the target value of specific enthalpy is determined based on the target values of temperature and humidity on the air supply side of the outdoor unit to the living room, and the outdoor unit is controlled so as to achieve this target value of specific enthalpy. Further, when an indoor unit and an outdoor unit are provided and a total heat exchanger is provided in the outdoor unit, the target value of specific enthalpy is determined based on the target values of temperature and humidity on the air supply side of the total heat exchanger to the living room, and the outdoor unit is controlled so as to achieve this target value of specific enthalpy.

[0007] By performing control so as to achieve the target value of specific enthalpy, the specific enthalpy will result in being constant. Specific enthalpy can be considered as the amount of heat that the indoor air has, and by performing air conditioning operation so as not to change this, energy savings can be achieved. The above and other objects, features, and advantages of the present invention will become clear from the following detailed description and the attached drawings.

Effects of the Invention

[0008] According to the present invention, by performing air conditioning control so that the temperature and humidity of the air to be controlled become a predetermined specific enthalpy, energy savings of air conditioning can be achieved within the range of the amount of heat and temperature of the air that a person can tolerate, contributing to the realization of a decarbonized society.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Mode for Carrying Out the Invention

[0010] Hereinafter, the best mode for carrying out the present invention will be described in detail based on examples.

Examples

[0011] First, Example 1 of the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 shows the main configuration of the air conditioning system 100 of this embodiment. It is an example of building air conditioning using a central air conditioning system and shows one of the many rooms in a building. Also, the boiler and refrigerator serving as heat sources are collectively shown as an air conditioner. In the figure, the room 110 to be air-conditioned or controlled in the air conditioning system 100 is provided with an air supply port 112 and a return air port 114, and the temperature and humidity in the room 110 are controlled by the air supplied from the air supply port 112.

[0012] The air conditioner 120 functions as a heat source for supplying air to the living room 110, and the air for air conditioning is sent by the fan 122 to the air supply port 112 of the living room 110 through the air supply duct 130. Also, the air returned from the air return port 114 of the living room 110 is returned from the air return duct 132 to the suction port 124 of the air conditioner 120, and a part of it is exhausted from the exhaust port 134. Further, the outside air introduced from the outside air inlet 136 is taken into the air conditioner 120 from the suction port 124. By adjusting the temperature and humidity of the returned air or outside air inhaled from the suction port 124 by the air conditioner 120 and supplying it to the living room 110, air conditioning in the living room 110 is performed. Such a configuration is well-known.

[0013] By the way, in the present embodiment, a temperature and humidity control device 150 and temperature and humidity detectors 152, 154, 156 for measuring the dry-bulb temperature and relative humidity are provided. Among these, the temperature and humidity detector 152 is of an indoor installation type and measures the dry-bulb temperature and relative humidity in the living room 110. The temperature and humidity detector 154 is of a duct insertion type and measures the dry-bulb temperature and relative humidity in the air return duct 132. The temperature and humidity detector 156 measures the dry-bulb temperature and relative humidity of the outside air. In the following description, the "dry-bulb temperature" is simply expressed as "temperature", and the "relative humidity" is simply expressed as "humidity".

[0014] Next, temperature and humidity setting data 160 is stored in advance in the temperature and humidity control device 150, and a temperature and humidity calculation unit 162 and a temperature and humidity control unit 164 are provided. The temperature and humidity calculation unit 162 calculates control data based on the temperature and humidity setting data 160 and the detection results of the temperature and humidity detectors 152, 154, 156, and based on this calculation result, the operation of the air conditioner 120 is controlled by the temperature and humidity control unit 164. These are realized, for example, as data and programs of a computer system.

[0015] The temperature and humidity setting data 160 is set corresponding to each operation mode of cooling and heating in the present embodiment, and is set to be within the indoor environment standard (building environmental health 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 Since it is defined as such, 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 It is like this.

[0016] And in the temperature and humidity control device 150, the target indoor temperature and humidity are further set within the above control range. For example, a, Target indoor temperature and humidity during cooling: temperature 25°C, humidity 70% b, Target indoor temperature and humidity during heating: 18°C, humidity 40% It is like this. When the target values of these indoor temperature and humidity are determined, the target value of specific enthalpy is determined from the psychrometric chart.

[0017] Figure 2 shows the state of range setting during cooling, a, The temperature range is determined by "temperature 25 - 28°C" on the horizontal axis of the psychrometric chart. b, From the target indoor temperature and humidity during cooling "temperature 25°C, humidity 70%", the target specific enthalpy becomes 60 kJ / kg. c, From the intersection of the graph of the target specific enthalpy 60.6 kJ / kg and the temperature 25°C, the relative humidity becomes 70%, and from the intersection of the temperature 28°C, the relative humidity becomes 53%.

[0018] As described above, during cooling, (1) Temperature 25 - 28°C (2) Humidity 53 - 70% (3) Specific enthalpy 60.6 kJ / kg It is set as the temperature and humidity setting data 160. Then, the temperature and humidity calculation unit 162 performs calculations so that the specific enthalpy becomes the target value, and based on this calculation result, the temperature and humidity control unit 164 controls the air conditioner 120. This control range is within the environmental standards described above. For example, when the temperature and humidity of the outside air or the return air duct 132 exceed the range of the set data, the air conditioner 120 cools and dehumidifies and supplies air to the living room 110.

[0019] Note that instead of the relative humidity (curve on the psychrometric chart), the absolute humidity (vertical axis of the psychrometric chart) may be used. The absolute humidity can be obtained from the temperature and relative humidity, and in the example of FIG. 2, it is 0.0128 to 0.0142 kg / kg.

[0020] FIG. 3 shows the state of setting the control range during heating, a. The control range of the temperature is determined by "temperature 18 to 22°C" on the horizontal axis of the psychrometric chart. b. From the target indoor temperature and humidity during heating "temperature 18°C, humidity 40%", the target specific enthalpy becomes 31 kJ / kg. c. From the intersection of the graph of the target specific enthalpy 31.1 kJ / kg and the temperature 18°C, the relative humidity is 40%, and from the intersection with the temperature 22°C, the relative humidity is 20%. As described above, during heating, (1) Temperature 18 to 22°C (2) Humidity 20 to 40% (3) Specific enthalpy 31.1 kJ / kg The temperature and humidity control device 150 performs calculations so that these conditions are met, and based on this calculation result, the air conditioner 120 is controlled so that the specific enthalpy becomes the target value. However, this control range does not fall within the environmental standard of humidity 40% or more described above. Therefore, in this embodiment, humidification is performed in the region R3A where the humidity is less than 40% shown in FIG. 3. That is, the condition of (2) becomes "humidity 40%".

[0021] Note that even during heating, absolute humidity (the vertical axis of the psychrometric chart) may be used instead of relative humidity (the curve of the psychrometric chart). In the example of Fig. 3, it is 0.0035 to 0.0056 kg / kg.

[0022] Next, with reference to Fig. 4 as well, the overall operation of this embodiment will be described. Fig. 4 shows the overall operation procedure of the air conditioning system 100 of this embodiment. In the example of this figure, as operation modes, a, a manual operation mode in which a user in the living room 110 sets the values of the indoor temperature and humidity, b, an automatic operation mode considering the specific enthalpy according to the present invention, exist, and either one is selected when operating the air conditioning system (step SA). When the manual operation mode is selected, the air conditioner 120 is operated so that the temperature and humidity in the living room 110 become the temperature and humidity set by the user (for example, temperature 26°C, humidity 50%) (step SB). This operation is known in a general air conditioning system.

[0023] Next, when the automatic operation mode is selected, depending on whether cooling or heating is performed, the above-described control range is set according to cooling or heating (step SC) (steps SD, SE). The switching between cooling and heating is performed, for example, every season. Next, the temperature and humidity in the living room 110, the outside air, and the return air duct 132 are measured by the temperature and humidity detectors 152, 154, and 156 respectively (step SF), and these are input to the temperature and humidity control device 150. Then, the temperature and humidity control device 150 refers to the temperature and humidity setting data 160, and in the temperature and humidity calculation unit 162, calculates the temperature and humidity of the supply air such that the specific enthalpy becomes the target value within the range of the temperature and humidity set in the living room 110 (step SG). Then, based on this calculation result, the temperature and humidity control unit 164 controls the cooling, heating, humidification, and dehumidification by the air conditioner 120, and the controlled air is supplied to the living room 110 (step SH). By repeating these operations, the temperature and humidity in the living room 110 are controlled to the preset target specific enthalpy and within the control range of the temperature and humidity. Note that during heating, in the region R3A where the humidity is less than 40% shown in Fig. 3, humidification is performed as described above.

[0024] As described above, the temperature and humidity in the living room 110 are controlled within the control range shown in FIGS. 2 to 3 so that the specific enthalpy becomes the target value. That is, the specific enthalpy in the living room 110 is maintained to be constant at the target value. The specific enthalpy can be considered as the amount of heat that the indoor air has, and the air-conditioning operation will be performed so as not to change this. Compared with the conventional manual operation (step SB), although there is a deviation in temperature and humidity from the target value in this embodiment, it still falls within the environmental standards, and the energy-saving effect of controlling the specific enthalpy to be constant at the target value can be obtained.

[0025] Also, even if the temperature is changed within a predetermined range, such as raising the temperature setting during the cooling period and lowering the temperature setting during the heating period, as long as the specific enthalpy is constant, the amount of heat of the air is constant. From this point, energy saving can be achieved and the quantification of the air-conditioning environmental quality can be achieved. In an air-conditioning system, especially in building air-conditioning, it is known that just by relaxing the indoor temperature by 1°C, an energy-saving effect of about 10% can be obtained (Kanto Bureau of Economy, Trade and Industry, "How to Promote Energy Saving and Key Points Useful at the Site", 2020). By applying the present invention, a significant energy-saving effect can be expected.

Example

[0026] Next, with reference to FIGS. 5 to 7, Example 2 of the present invention will be described. FIG. 5 shows the main configuration of the air conditioning system 200 of this embodiment, which is an example in which the present invention is applied to an air conditioning system including an outdoor unit and an indoor unit, and shows one of a number of rooms in a building. In the figure, in the room 210 to be air-conditioned, an air supply port 212, a fan 214, and an indoor unit 280 are provided. As the indoor unit 280, various known systems such as an FCU (fan coil unit) system and a PAC (package air conditioner) system are applicable. The temperature and humidity in the room 210 are adjusted by the air supplied from the air supply port 212 and the air conditioning operation of the indoor unit 280, and are exhausted from the exhaust duct 216 and the exhaust port 234 by the fan 214. The outdoor unit 220 functions as a heat source for supplying air to the room 210, takes in outside air from the outside air inlet 236, and supplies the air conditioned by the fan 222 from the air supply duct 230 to the air supply port 212 of the room 210. The basic operations of these indoor units 280 and outdoor units 220 are well known.

[0027] By the way, in this embodiment, an indoor control unit 282 is provided in the indoor unit 280 of the room 210. Based on the indoor temperature and humidity detected by the indoor installation type temperature and humidity detector 284, a control signal is calculated, and the operation of the indoor unit 280 is controlled. The setting and operation of the control range of the indoor unit 280 by the indoor control unit 282 and the indoor type temperature and humidity detector 284 are the same as those in the above-described Example 1.

[0028] On the other hand, for the outdoor unit 220, a temperature and humidity control device 250 and temperature and humidity detectors 252, 254, 256 for measuring the dry bulb temperature and relative humidity are provided. Among these, the temperature and humidity detector 252 is of a duct insertion type and measures the dry bulb temperature and relative humidity in the air supply duct 230. The temperature and humidity detector 254 is of a duct insertion type and measures the dry bulb temperature and relative humidity in the exhaust duct 216. The temperature and humidity detector 256 measures the dry bulb temperature and relative humidity of the outside air.

[0029] The temperature and humidity control device 250 stores temperature and humidity setting data 260 in advance, and is provided with a temperature and humidity calculation unit 262 and a temperature and humidity control unit 264. The temperature and humidity calculation unit 262 calculates control data based on the temperature and humidity setting data 260 and the detection results of the temperature and humidity detectors 252, 254, and 256, and based on this calculation result, the operation of the external unit 220 is controlled by the temperature and humidity control unit 264. These are realized, for example, as data and programs of a computer system.

[0030] In the temperature and humidity control device 250, the supply air temperature and humidity from the external unit 220 to the living room 210 are set as follows, for example, and stored as the temperature and humidity setting data 260. a. During cooling: temperature 19 - 28°C, humidity 70% or less b. During heating: temperature 18 - 24°C, humidity 40% or more It is like this. And in the temperature and humidity control device 250, the target supply air temperature and humidity are further set within the above control range. For example, a. Cooling target temperature and humidity: temperature 25°C, humidity 70% b. Heating target temperature and humidity: temperature 18°C, humidity 40% Once these target values of the supply air temperature and humidity are determined, the specific enthalpy is determined from the psychrometric chart.

[0031] Fig. 6 shows the state of setting the control range during cooling. a. As described above, since the supply air temperature from the external unit 220 to the living room 210 is set to 19 - 28°C during cooling, the temperature control range is determined by "temperature 19 - 28°C" on the horizontal axis of the psychrometric chart. b. From the target temperature and humidity: temperature 25°C, humidity 70%, the target specific enthalpy becomes 54.1 kJ / kg. c. From the intersection of the graph with the target specific enthalpy of 54.1 kJ / kg and the temperature of 19°C, the absolute humidity is 0.014 kg / kg, and from the intersection with the temperature of 28°C, the absolute humidity is 0.0102 kg / kg. In this embodiment, the temperature and humidity control device 250 controls the external unit 220 so that the specific enthalpy of the supply air supplied from the external unit 220 to the living room 210 becomes the above target value.

[0032] In addition, in FIG. 6, a. Region R6A: Indoor temperature and humidity region with a temperature of 25 to 28°C and a humidity of 70% or less. b. Region R6B: Region frequently seen in the temperature and humidity of the outside air on sunny days in midsummer. c. Region R6C: Region where the external unit 220 dehumidifies and the supply air temperature supplied to the living room 210 is set to be equal to or lower than the dew point temperature. Each is shown (in the case of Tokyo).

[0033] As described above, during cooling, (1) Temperature 19 to 28°C (2) Specific enthalpy 54.1 kJ / kg (3) Humidity 43 to 100% (absolute humidity 0.0102 to 0.0138 kg / kg) The temperature and humidity control device 250 calculates the control data so as to achieve the above conditions, and based on the calculation result, the external unit 220 is controlled so that the specific enthalpy becomes the target value. When comparing FIG. 2 and FIG. 6 described above, the target temperature and humidity during cooling are the same at a temperature of 25°C and a humidity of 70%. However, in the case of the indoor air, when the specific enthalpy on the coordinate is the supply air temperature, for dehumidification, the dew point temperature on the absolute humidity line is the reference for determining the specific enthalpy.

[0034] FIG. 7 shows the state of setting the control range during heating. a. As described above, since the supply air temperature from the external unit 220 to the living room 210 is set to 18 to 24°C during heating, the temperature control range is determined by the "temperature 18 to 24°C" on the horizontal axis of the psychrometric chart. b. From the reference indoor temperature and humidity: temperature 18°C, humidity 40%, the specific enthalpy becomes 31.1 kJ / kg. c, From the intersection of the graph of specific enthalpy of 31.1 kJ / kg and the temperature of 18°C, the absolute humidity becomes 0.0054 kg / kg, and from the intersection of the temperature of 24°C, the absolute humidity becomes 0.003 kg / kg (relative humidity 16%). In this embodiment, the control device 250 controls the outdoor unit 220 so that the specific enthalpy of the supply air supplied from the outdoor unit 220 to the living room 210 becomes the above value.

[0035] In addition, in FIG. 7, a, Region R7A: Indoor temperature and humidity region with a temperature of 18 to 22°C and a humidity of 40% or less, b, Region R7B: Temperature and humidity region of outdoor air on rainy days in winter, c, Region R7C: Region where the supply air temperature from the outdoor unit 220 to the living room 210 can be lowered, d, Region R7D: Region where the humidity is low and humidification is required, and the humidification efficiency is improved by increasing the supply air temperature, are respectively shown.

[0036] As described above, during heating, (1) Temperature 18 to 24°C (2) Specific enthalpy 31.1 kJ / kg (3) Humidity 16 to 40% (absolute humidity 0.003 to 0.0054 kg / kg) The control data is calculated by the temperature and humidity control device 250 so that the specific enthalpy becomes the target value, and based on this calculation result, the outdoor unit 220 is controlled so that the specific enthalpy becomes the target value.

[0037] Next, to explain the overall operation of this embodiment, the selection of the operation mode shown in FIG. 4 and the setting of the target value by the user in the living room are the same as those in the above-described Embodiment 1. When the automatic operation mode is selected, the following operations are performed. That is, during cooling, a, In the outdoor unit 220, air with a constant specific enthalpy is supplied to the living room 210 based on the calculation result by the temperature and humidity control device 250. In the example of FIG. 6 during cooling, the specific enthalpy is 54.1 kJ / kg, and in the example of FIG. 7 during heating, the specific enthalpy is 31.1 kJ / kg. b. In the indoor unit 280, air conditioning of the living room 210 is performed based on the calculation result by the indoor control unit 282 so that the specific enthalpy becomes constant. In the example of FIG. 2 during cooling, the specific enthalpy is 60.6 kJ / kg, and in the example of FIG. 3 during heating, the specific enthalpy is 31.1 kJ / kg.

[0038] As described above, according to this embodiment, in both the indoor unit 280 and the outdoor unit 220, the control is performed so that the specific enthalpy becomes constant at the target value, and the air conditioning operation is performed without changing the amount of heat carried by the air. Also, looking at the whole of the outdoor unit 220 and the indoor unit 280, a. During cooling, the specific enthalpy is supply air 54.1 kJ / kg → indoor 60.6 kJ / kg b. During heating, the specific enthalpy is supply air 31.1 kJ / kg → indoor 31.1 kJ / kg As a result, in a state where dehumidification and humidification are not necessarily required, the specific enthalpy of the air hardly changes. Also from this point, the consumption of extra energy is reduced.

Embodiment

[0039] Next, referring to FIG. 8 and FIGS. 6 and 7 used in Embodiment 2, Embodiment 3 of the present invention will be described. FIG. 8 shows the main configuration of the air conditioning system 300 of this embodiment, and has a configuration in which a total heat exchanger 350 is provided in the outdoor unit 310. In the figure, in the outdoor unit 310, the lower part is the supply air side 312 and the upper part is the exhaust air side 314. On the supply air side 312, a suction side 352 of the total heat exchanger 350, a direct expansion coil (cooling and heating water coil) 324, a humidifier 326, and a supply air fan 328 are provided. On the other hand, on the exhaust air side 314 of the outdoor unit 310, an exhaust fan 338 and a discharge side 354 of the total heat exchanger 350 are provided.

[0040] The outdoor unit 310 and the living room 400 are connected such that the air supply fan 328 side is connected to the air supply port 410 by the air supply duct 412, and the exhaust fan 338 side is connected to the exhaust port 420 by the exhaust duct 422. On the other hand, between the outdoor unit 310 and the outside air, the suction side 352 of the total heat exchanger 350 is connected to the suction port 320 by the suction duct 322, and the discharge side 354 of the total heat exchanger 350 is connected to the discharge port 330 by the discharge duct 332.

[0041] That is, the outside air is sucked from the suction port 320 to the outdoor unit 310 side, heat exchange is performed by the total heat exchanger 350, temperature and humidity control is then performed by the direct expansion coil 324 and the humidifier 326, and it is supplied into the living room 400 from the air supply port 410 by the air supply fan 328. On the other hand, the air that has contributed to air conditioning in the living room 400 is exhausted from the exhaust port 420 to the outdoor unit 310 side by the exhaust fan 338, heat exchange is performed by the total heat exchanger 350, and then it is discharged to the outside air from the discharge port 330. Such a mechanism is well-known.

[0042] By the way, in this embodiment, a temperature and humidity control device 450 for performing temperature and humidity control of the outdoor unit 310 is provided, and temperature and humidity detectors 360, 362, 364, 366, 368 for measuring the dry bulb temperature and relative humidity are provided. Among these, the temperature and humidity detectors 360, 364, 366, 368 are all of the duct insertion type and measure the dry bulb temperature and relative humidity inside the duct. The temperature and humidity detector 362 is provided on the outlet side of the suction side 352 of the total heat exchanger 350 and measures the dry bulb temperature and relative humidity at the suction and discharge ports of the total heat exchanger 350.

[0043] Temperature and humidity setting data 460 is stored in advance in the temperature and humidity control device 450, and a temperature and humidity calculation unit 462 and a temperature and humidity control unit 464 are provided. The temperature and humidity calculation unit 462 calculates control data based on the temperature and humidity setting data 460 and the detection results of the temperature and humidity detectors 360 to 368, and based on this calculation result, the operation of the outdoor unit 310 is controlled by the temperature and humidity control unit 464.

[0044] In this embodiment, in the temperature and humidity detector 364 for the air supply port 410, for example, a. Target temperature and humidity during cooling: temperature 19 - 28°C, humidity 70% or less b. Target temperature and humidity during heating: temperature 18 - 24°C, humidity 40% or more It is set in this way, and based on these target values, as shown in FIGS. 6 and 7 described above, the specific enthalpy is determined from the psychrometric chart.

[0045] For example, during cooling in FIG. 6, (1) Temperature 19 - 28°C (2) Specific enthalpy 54.1 kJ / kg (3) Humidity 43 - 70% (absolute humidity 0.0102 - 0.0138 kg / kg) The temperature and humidity control device 450 performs calculations so as to achieve these values. Based on the calculation results, the external unit 310 is controlled so that the specific enthalpy becomes the set value. Region R6A in FIG. 6 is the region for dehumidification.

[0046] On the other hand, during heating in FIG. 7, (1) Temperature 18 - 24°C (2) Specific enthalpy 31.1 kJ / kg (3) Humidity 14.8 - 40% (absolute humidity 0.0027 - 0.0051 kg / kg) The temperature and humidity control device 450 performs calculations so as to achieve these values. Based on the calculation results, the external unit 310 is controlled so that the specific enthalpy becomes the target value. Region R7A in the same figure is the temperature and humidity region at the inlet of the direct expansion coil 324.

[0047] In the above description, the target temperature and humidity are set at the outlet of the suction side 352 of the total heat exchanger 350 to the inlet side of the direct expansion coil 324, and the target specific enthalpy is determined from the psychrometric chart based on these target values. However, for example, the target values of the temperature and humidity of the air supply to the living room 400 may be set, and the specific enthalpy may be determined based on these target values.

[0048] As described above, in this embodiment, the total heat exchanger 350 is provided, and the temperature and humidity are detected either on the inlet side of the direct expansion coil 324 or on the air supply side in the living room 400. Based on the detection result, the air supply to the living room is controlled so as to reach the set value of the specific enthalpy. Since the specific enthalpy adjusted by heating and cooling is constant, the same effect as that of the above embodiment can also be obtained by this embodiment.

Embodiment

[0049] Next, with reference to FIG. 9, Embodiment 4 of the present invention will be described. This embodiment further improves energy savings by adjusting the start-up time or stop time of the air conditioner according to the heating and cooling load conditions. Regarding the basic concept of the optimal start and stop of the air conditioner, for example, it is described in detail in the "Energy Conservation Measures Promotion Project for Commercial Buildings in FY2007, New Edition Energy Tuning Manual" of the Energy Conservation Center, Japan, pages 91 to 95 (published in March 2008).

[0050] In this embodiment, as shown in FIG. (A) of the same figure, an optimal start / stop control unit 500 is additionally provided in the temperature and humidity control device 150 of Embodiment 1 described above. This optimal start / stop control unit 500 advances the start or stop time according to a preset schedule with reference to the specific enthalpy in the living room. This operation is also executed as a computer program.

[0051] First, starting from the start-up, with reference to FIG. (B) of the same figure, a. First, the air conditioner is pre-operated so that the room temperature reaches the target temperature at the start-up time based on a preset schedule, and the past specific enthalpy in the room is obtained by calculation. b. Next, the operation time until the past specific enthalpy in the room obtained by the above calculation reaches the allowable specific enthalpy at the start of use of the living room is learned (step S10). c. Next, the operation time required for advancing is calculated from the specific enthalpy in the room before the advance operation permission time on the current day, and the operation start time is determined (step S12). d, Next, compare the operation start time determined in c above with the early start time of the schedule, and adopt the shorter early start time (step S14). e, Next, when the adopted early start time is reached, start the early start operation (step S16). f, After that, perform the operation with a constant specific enthalpy as the above-mentioned target.

[0052] Next, referring to FIG. (C), the stop time will be described. a, First, the air conditioner is pre-emptively stopped so as to stop at the stop time based on a preset schedule, and the past specific enthalpy in the room is obtained by calculation. b, Next, learn the operation time until the past specific enthalpy in the room obtained by the above calculation reaches the allowable specific enthalpy at the end of the operation in the living room (step S20). c, Next, calculate the possible stop time from the specific enthalpy in the room before the scheduled pre-emptive stop time on the current day, and determine the operation stop time (step S22). d, Next, compare the operation stop time determined in (3) above with the pre-emptive stop time of the schedule, and adopt the shorter pre-emptive stop time (step S24). e, Next, when the adopted pre-emptive stop time is reached, start the pre-emptive stop operation (step S26).

[0053] Thus, it is possible to limit the possible time of the pre-emptive operation in the optimal start / stop. During the pre-emptive operation of the optimal start / stop, depending on the usage status of the air conditioner 120, it is possible to prohibit humidification or perform air conditioning operation by full recirculation without introducing outside air when the outside air cooling is invalid. Such control of the optimal start / stop may be similarly applied to the other embodiments described above.

[0054] <Other Embodiments> Note that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention. For example, the following are also included. (1) As for building air conditioning, there are various methods such as central air conditioning systems and individual air conditioning systems, and the present invention is applicable to any of them. It is also applicable to air conditioning devices for general households. (2) The configuration of the air conditioning system shown in the above embodiments is an example, and various known configurations may be used. (3) The numerical values such as temperature and humidity shown in the above embodiments are also examples, and may be set according to the situation in actual operation. (4) In the above embodiments, the dry-bulb temperature and relative humidity were described, but it is also possible to consider the absolute humidity on the vertical axis of the psychrometric chart.

[0055] (5) At the start of air conditioning, in summer, the operation may be started at the upper limit value of the set temperature, and in winter, at the lower limit value. After a predetermined set time has elapsed, control may be started so that the specific enthalpy described above becomes the set value. For example, in the case of cooling in FIG. 6, the temperature control range is 19 to 28 °C. If the outside air temperature at the start of operation is, for example, 31 °C, a. First, for a certain period of time (interval time) from the start of operation, the operation of the outdoor unit 310 is performed until the supply air temperature to the living room 400 reaches 28 °C. b. Thereafter, the operation of the outdoor unit 310 is controlled so that the specific enthalpy becomes the target value. This is the case. At this time, the upper and lower limit set values of the temperature and the interval time are appropriately adjusted according to the operation results. The same applies to the case of heating. There are individual differences in the perception of temperature, and there are two methods for changing the temperature setting in response to requests such as feeling hot or cold during air conditioning. One method is to change the temperature setting by changing the target value of the specific enthalpy to change the amount of heat in the air, and the other method is to fix the temperature setting value to the desired value by setting the upper and lower limit set values of the temperature to the same value and perform air conditioning.

Industrial Applicability

[0056] According to the present invention, the specific enthalpy is obtained from the target values of the temperature and humidity of the air to be controlled, and the air conditioning control in the living room is performed so that this becomes the set value. Therefore, the temperature and humidity in the living room can be favorably controlled within the set range with a minimum amount of energy, achieving energy savings, and it is suitable for air conditioning in buildings, factories, and ordinary households.

Description of the Signs

[0057] 100: Air conditioning system 110: Living room 112: Air supply port 114: Return air port 120: Air conditioner 122: Fan 124: Suction port 130: Air supply duct 132: Return air duct 134: Exhaust port 136: Outdoor air inlet 150: Temperature and humidity control device 152, 154, 156: Temperature and humidity detectors 160: Temperature and humidity setting data 162: Temperature and humidity calculation unit 164: Temperature and humidity control unit 200: Air conditioning system 210: Living room 212: Air supply port 214: Fan 216: Exhaust duct 220: Outdoor unit 222: Fan 230: Air supply duct 234: Exhaust port 236: Outdoor air inlet 250: Temperature and humidity control device 252, 254, 256: Temperature and humidity detectors 260: Temperature and humidity setting data 262: Temperature and humidity calculation unit 264: Temperature and humidity control unit 280: Indoor unit 282: Indoor control unit 284: Indoor-installed temperature and humidity detector 300: Air conditioning system 310: External adjustment machine 312: Air supply side 314: Exhaust side 320: Suction port 322: Suction duct 324: Direct expansion coil 326: Humidifier 328: Air supply fan 330: Discharge port 332: Discharge duct 338: Exhaust fan 350: Total heat exchanger 352: Suction side 354: Discharge side 360, 362, 364, 366, 368: Temperature and humidity detector 400: Living room 410: Air supply opening 412: Air supply duct 420: Exhaust opening 422: Exhaust duct 450: Temperature and humidity control device 460: Temperature and humidity setting data 462: Temperature and humidity calculation unit 464: Temperature and humidity control unit 500: Optimal start / stop control unit

Claims

1. An air conditioning system for air conditioning a living room, air conditioning means for performing air conditioning so that the temperature and humidity in the living room fall within a predetermined set range, humidity and temperature control means for controlling the air conditioner so that the target value of specific enthalpy determined based on the target values of temperature and humidity in the living room is achieved, An air conditioning system characterized by comprising the above.

2. The humidity and temperature control means stores the target values of temperature and humidity in the living room and the target value of specific enthalpy determined based thereon as humidity and temperature setting data, and humidity and temperature detection means for detecting the temperature and humidity in the living room, arithmetic means for calculating control data for the air conditioner based on the humidity and temperature setting data and the detection results by the humidity and temperature detection means, humidity and temperature control means for controlling the air conditioner based on the control data, The air conditioning system according to claim 1, characterized by comprising the above.

3. An air conditioning system for air conditioning a living room, air conditioning means for performing air conditioning so that the temperature and humidity in the living room fall within a predetermined set range, The air conditioning means is composed of an indoor unit and an outdoor unit, humidity and temperature control means for controlling the outdoor unit so that the target value of specific enthalpy determined based on the target values of temperature and humidity on the air supply side of the outdoor unit to the living room is achieved, An air conditioning system characterized by comprising the above.

4. The humidity and temperature control means stores the target values of temperature and humidity on the air supply side of the outdoor unit to the living room and the target value of specific enthalpy determined based thereon as humidity and temperature setting data, and humidity and temperature detection means for detecting the temperature and humidity on the air supply side of the outdoor unit to the living room, An arithmetic means for calculating control data for the outdoor unit based on the temperature and humidity setting data and the detection result by the temperature and humidity detection means; A temperature and humidity control means for controlling the outdoor unit based on the control data; The air conditioning system according to claim 3, characterized by comprising the above.

5. An air conditioning system for air conditioning in a living room, Air conditioning means for performing air conditioning so that the temperature and humidity in the living room fall within a predetermined set range, The air conditioning means is composed of an indoor unit and an outdoor unit, The outdoor unit is provided with a total heat exchanger, Temperature and humidity control means for controlling the outdoor unit so that the target value of the specific enthalpy is determined based on the target values of the temperature and humidity on the air supply side of the total heat exchanger with respect to the living room, The air conditioning system characterized by comprising the above.

6. The temperature and humidity control means, Stores the target values of the temperature and humidity on the air supply side of the total heat exchanger with respect to the living room and the target value of the specific enthalpy determined based thereon as temperature and humidity setting data, and Temperature and humidity detection means for detecting the temperature and humidity on the air supply side of the total heat exchanger with respect to the living room, An arithmetic means for calculating control data for the outdoor unit based on the temperature and humidity setting data and the detection result by the temperature and humidity detection means; A temperature and humidity control means for controlling the outdoor unit based on the control data; The air conditioning system according to claim 5, characterized by comprising the above.

7. The temperature and humidity control means is provided with an optimal start / stop control unit, The optimal start / stop control unit, Compares the operation time until the allowable specific enthalpy is reached at the start of use of the living room with the past cases, and starts the operation of the air conditioner by adopting a shorter time, Compare the stop time until the specific enthalpy reaches an acceptable level when the operation of the living room stops with the past cases, and adopt a shorter time to stop the operation of the air conditioner. The air conditioning system according to any one of claims 1 to 6, characterized in that.

8. The air conditioning system according to any one of claims 1 to 6, characterized in that the control range by the air conditioning means is set within the range of the building environmental sanitation management standards.

9. A temperature and humidity control program executed by the temperature and humidity control means according to claim 2, comprising: A step of calculating control data for the air conditioner based on the temperature and humidity setting data and the detection result by the temperature and humidity detection means; A temperature and humidity control step of controlling the air conditioner based on the control data; A temperature and humidity control program characterized by comprising the above.

10. A temperature and humidity control program executed by the temperature and humidity control means according to claim 4 or 6, comprising: A step of calculating control data for the outdoor unit based on the temperature and humidity setting data and the detection result by the temperature and humidity detection means; A temperature and humidity control step of controlling the outdoor unit based on the control data; A temperature and humidity control program characterized by comprising the above.

11. An air conditioning method characterized by performing air conditioning in a living room by the air conditioning system according to any one of claims 1 to 6.

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