Patent Grant
11262092
This application is a U.S. national stage application of PCT/JP2016/067023 filed on Jun. 8, 2016, the contents of which are incorporated herein by reference.
The present invention relates to an air conditioning system including an inside air conditioner that heats indoor air and an outside air conditioner serving as a ventilator that humidifies outdoor air and supplies the humidified outdoor air into a room.
Control for reducing a sensible heat load caused by humidification is proposed in order to prevent an increase in cooling load due to the heating capability generated upon humidification in a scene that requires cooling and humidification, such as in a low temperature warehouse or a pantry (for example, see Japanese Patent Laying-Open No. 11-351730).
An air conditioning system for air conditioning of an office is known, which includes an inside air conditioner having a refrigerant circuit (refrigeration cycle) and an outside air conditioner. The refrigerant circuit of the inside air conditioner includes a compressor, a four-way valve, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger. The compressor, four-way valve, outdoor heat exchanger, expansion valve, and indoor heat exchanger are connected in order by piping. Refrigerant circulates through the refrigerant circuit, allowing the inside air conditioner to adjust the temperature of the indoor air.
The outside air conditioner exchanges indoor air with fresh outdoor air. Specifically, the outside air conditioner supplies outdoor air into a room while discharging indoor air to outside the room. At that time, the outside air conditioner heats and humidifies outdoor air as necessary.
PTL 1: Japanese Patent Laying-Open No 11-351730
A recent office has better heat insulation and better airtightness, with an increasing number of OA appliances. This may lead to a low heating load or the occurrence of cooling load also during wintertime in which heating is usually performed. In contrast, the interior of a room becomes dry and indoor air needs to be humidified in many cases during wintertime. In such cases, an air conditioning system is required that performs a heating and humidifying operation or a cooling and humidifying operation during wintertime.
Controlling for reducing a sensible heat load or reducing a humidification load as disclosed in Japanese Patent Laying-Open No. 11-351730 can be applied in the cooling and humidifying operation. In the heating and humidifying operation, however, such control cannot be applied especially when the sensible heat load is relatively low.
If the sensible heat load is low during the heating and humidifying operation, a heating amount generated in the outside air conditioner after performing the heating and humidifying operation is supplied into the room, in addition to a heating amount generated in the inside air conditioner after performing an indoor heating operation. Consequently, the heating amount exceeds the sensible heat load, and the indoor temperature reaches a target temperature before the indoor humidity reaches a target humidity.
Thus, the heating and humidifying operation is continued until the target humidity is reached on the outside air conditioner side, while the indoor heating operation using the inside air conditioner is stopped. In this state, though the room temperature has reached the target temperature, the room temperature further increases as the heating amount generated by the outside air conditioner due to the heating and humidifying operation is continuously supplied. Once the room temperature exceeds a set temperature to some extent, a cooling operation using the inside air conditioner is started to reduce the room temperature.
A heating and humidifying operation using the outside air conditioner is performed while a cooling and dehumidifying operation using the inside air conditioner is eventually performed, resulting in a state in which energy is consumed unnecessarily by conflicting operations (a state in which cooling and dehumidication is performed simultaneously with heating and humidification, hereinafter referred to as a “conflicting state”).
The present invention has been made to solve the above problem, and has an object to provide an air conditioning system capable of avoiding a conflicting state in which a heating and humidifying operation is performed using an outside air conditioner while performing a cooling and dehumidifying operation using an inside air conditioner, thus reducing unnecessary energy consumption.
The present invention relates to an air conditioning system, which includes a detection unit, a ventilator, and an indoor unit. The detection unit is configured to detect humidity of indoor air. The ventilator is configured to, when the detected humidity detected by the detection unit is lower than a threshold value, introduce air from outside a room, heat and humidify the air, and supply the heated and humidified air into the room. The indoor unit is configured to heat the indoor air by an indoor heating operation. Electric power consumed in the indoor heating operation when the detected humidity is lower than the threshold value is lower than electric power consumed in the indoor heating operation when the detected humidity is higher than the threshold value.
The present invention can avoid a “conflicting state” occurring as a result of the cooling and dehumidifying operation using the inside air conditioner and the heating and humidifying operation using the outside air conditioner when a heating load and a humidification load are present, thus reducing unnecessary energy consumption.
Embodiments of the present invention will be described below in detail with reference to the drawings. Although several embodiments will be described below, an appropriate combination of the configurations described in the respective embodiments has been intended at the time of application. The same or corresponding parts will be designated by the same reference numerals, and a description thereof will not be repeated.
<Configuration>
Outside air conditioner 4 introduces outdoor air through duct 3 and humidifies the introduced air, and then supplies the humidified air into the room. An inside air conditioner 2 adjusts the temperature of indoor air.
As shown in
Outdoor unit 1 includes a compressor 31, a four-way valve 32, an outdoor heat exchanger 33, a blower 36, and a compressor frequency control unit 300.
Inside air conditioner 2 includes an indoor heat exchanger 35, an expansion valve 34, an inside-air-conditioner heating capability sensing unit 301, an indoor temperature sensing unit 302, and a blower 37. Although
Outside air conditioner 4 includes a ventilation heat exchanger 38, an expansion valve 30, an outside-air-conditioner heating capability sensing unit 303, and a blower 40.
Compressor 31 sucks and compresses refrigerant, and discharges the refrigerant as high-temperature, high-pressure gas refrigerant. Compressor 31 has, for example, an inverter therein. Compressor frequency control unit 300 controls an operation frequency (rotation speed) of compressor 31. This controls a capacity (an amount of refrigerant discharged per unit time) of compressor 31.
Both of ventilation heat exchanger 38 and indoor heat exchanger 35 operate as condensers during heating. Ventilation heat exchanger 38 performs heat exchange between the refrigerant discharged from compressor 31 and the outdoor air introduced by blower 40 for air supply, and condenses the refrigerant. Indoor heat exchanger 35 performs heat exchange between the refrigerant discharged from compressor 31 and the indoor air flowed by blower 36 for an indoor heat exchanger, and condenses the refrigerant.
Expansion valve 30 decompresses the refrigerant from ventilation heat exchanger 38. Expansion valve 34 decompresses the refrigerant from indoor heat exchanger 35. The degrees of opening of expansion valves 30 and 34 are controlled, so that the decompression amount of the refrigerant is controlled.
Outdoor heat exchanger 33 operates as an evaporator during heating, performs heat exchange between the refrigerant from expansion valves 30 and 34 and the outdoor air, and evaporates the refrigerant.
Two air ducts are provided adjacent to each other inside outside air conditioner 4. Blower 40 for air supply and blower 41 for air exhaustion are provided in the air duct on one side (the lower side of the sheet), and total heat exchanger 42 is placed across the two air ducts between blower 40 and blower 41. Ventilation heat exchanger 38 and humidifier 43 are placed in order downstream of blower 40. In an air duct in which blower 40 and the like are not placed (an air duct on the upper side of the sheet), humidification load sensing unit 304 and outside air temperature and humidity sensing unit 305 for inside a room are placed. Humidification load sensing unit 304 and outside air temperature and humidity sensing unit 305 sense, for example, a humidification load as well as the temperature and humidity of outdoor air from outputs of the temperature and humidity sensor.
The two air ducts intersect each other at total heat exchanger 42. As indicated by the arrows in
Total heat exchanger 42 has a structure in which, for example, ventilation air ducts orthogonal to each other are placed one over the other. Indoor air RA and outdoor air OA pass through the ventilation air ducts, so that total heat exchange is performed between indoor air RA and outdoor air OA.
A flow of air passing through outside air conditioner 4 will be described. First, outdoor air OA is guided by blower 40 for air supply to total heat exchanger 42, passes through ventilation heat exchanger 38, and then passes through humidifier 43, so that supply air SA is supplied into the room. In contrast, indoor air RA passes through total heat exchanger 42 by blower 41 for air exhaustion, and is then exhausted to outside the room as exhaust air EA.
Humidifier 43 may be, for example, a vaporizing humidifier capable of adjusting a flow rate of water. When indoor humidification is required, ventilation heat exchanger 38 functions as a condenser and heats the air. Also, when indoor humidification is required, humidifier 43 is supplied with water. The heated air passes through humidifier 43, so that air is humidified and supplied into the room.
In contrast, when indoor humidification is not required, expansion valve 30 is closed so as not to allow refrigerant to flow to ventilation heat exchanger 38.
When the heating capabilities of inside air conditioners 2A and 2B or the humidification capability of outside air conditioner 4 is to be adjusted, compressor frequency control unit 300 is used to adjust an operation frequency of compressor 31 or manipulate the degree of opening of expansion valve 34. Specifically, the operation frequency of compressor 31 is adjusted to adjust a condensation temperature CT of refrigerant, and the degrees of opening of expansion valves 34 and 30 are adjusted to adjust the degrees of supercooling refrigerant in indoor heat exchanger 35 and ventilation heat exchanger 38, respectively.
In the following description, a sensor group is a generic term including various temperature and humidity sensors 206 and a pressure sensor 204. An actuator group is a generic term including compressor 31, four-way valve 32, expansion valves 30 and 34, and blowers 36, 37, 40, and 41.
Main controller 201 includes a compressor frequency control unit 300, an inside-air-conditioner heating capability sensing unit 301, an indoor temperature sensing unit 302, an outside-air-conditioner heating capability sensing unit 303, a humidification load sensing unit 304, an outside air temperature and humidity sensing unit 305, and a storage unit 306.
Main controller 201 reads various amounts sensed by pressure sensor 204 and various temperature and humidity sensors 206. Main controller 201 then performs a control operation based on the various amounts that have been read, thus controlling the actuator group.
Main controller 201 includes built-in storage unit 306 that stores a predetermined constant, a setup value transmitted from remote control 202, or the like. Main controller 201 can refer to or rewrite the content thereof as required.
Compressor frequency control unit 300, inside-air-conditioner heating capability sensing unit 301, indoor temperature sensing unit 302, outside-air-conditioner heating capability sensing unit 303, humidification load sensing unit 304, and outside air temperature and humidity sensing unit 305 described above are configured with microcomputers, and storage unit 306 is configured with a semiconductor memory or the like.
Although
A user can input, via remote control 202, commands to control ON/OFF of cooling, ON/OFF of heating, and ON/OFF of ventilation, indoor set temperature, indoor set humidity, or the like through input unit 211. Main controller 201 can read setting data based on a user's operation.
Remote control 202 is provided with a display 212 for displaying a current operation mode, a set temperature, a set humidity, and a message for the user.
<Operations>
Operations of air conditioning system 103 in Embodiment 1 of the present invention will now be described.
With reference to
When the humidity condition has been met (YES in step S1), controller 200 closes expansion valve 34 at the outlet portion of inside air conditioner 2 to stop the indoor heating operation using inside air conditioner 2 (step S2). Controller 200 then starts the heating and humidifying operation using outside air conditioner 4 (step S3). In the heating and humidifying operation, expansion valve 30 is opened to cause high-temperature refrigerant to flow into ventilation heat exchanger 38 and also cause water to be supplied to humidifier 43.
With reference to
In contrast, when the humidity condition is not met (NO in step S1), the process is advanced to step S4, so that the current heating operation state is continued. As shown in
As described above, when a heating load and a humidification load are present in the room, if the humidification load of indoor air RA sensed by humidification load sensing unit 304 is greater than the reference value, the indoor heating operation using inside air conditioner 2 is stopped, and the heating and humidifying operation using outside air conditioner 4 is performed. In contrast, if the sensed humidification load of indoor air RA is lower than the reference value, the current operation is continued.
When the indoor heating operation using inside air conditioner 2 is stopped and the heating and humidifying operation using outside air conditioner 4 is performed, if the humidification load sensed by humidification load sensing unit 304 decreases to the value smaller than or equal to the reference value (if the humidification load is sufficiently low), the indoor heating operation using inside air conditioner 2 is started. At this time, outside air conditioner 4 closes expansion valve 34 to interrupt refrigerant flowing into ventilation heat exchanger 38 and guides the outdoor air flowing into the humidifier to humidifier 43 without heating. Since the air guided to humidifier 43 has not been heated, it contains a smaller amount of moisture to be humidified by humidifier 43 than in the heating and humidifying operation. This leads to decreased heating amount and decreased humidification amount that are to be supplied into the room by outside air conditioner 4.
The magnitude of a humidification load is determined based on a difference between a humidity RH and target humidity RH_tgt or a difference between an absolute humidity X and a target absolute humidity X_tgt. Absolute humidity X can be calculated from humidity RH and temperature T, which have been measured.
At this time, the indoor temperature and indoor humidity rise because of the heating capability and humidification capability of outside air conditioner 4. At time t2, when the humidification load is smaller than the reference value, the indoor heating operation is started on the inside air conditioner 2 side, and the humidifying operation is performed on the outside air conditioner 4 side.
Since inside air conditioner 2 and outside air conditioner 4 are controlled such that air conditioning system 103 processes a humidification load and then processes a heating load as described above, the occurrence of a “conflicting state” can be avoided when a heating load and a humidification load are present in the room. Subsequently, the indoor heating operation is restarted after the humidification load has been processed, and the humidifying operation is performed on the outside air conditioner 4 side, allowing both of the indoor heating load and the indoor humidification load to be processed finally. The completion of the process for humidification load is determined by humidity reaching the target humidity. The completion of the process for the heating load is determined by the room temperature reaching the target temperature.
In step S14, whether the heat condition has been met is determined. For example, when a difference between an indoor temperature T obtained by indoor temperature sensing unit 302 and target value T_tgt of indoor temperature is greater than a reference value (when the heating load exceeds the reference value), it can be determined that the heating condition is met.
When the heating condition is met in step S14 (YES in S14), the process is advanced to step S15 to start the indoor heating operation on the inside air conditioner 2 side, and is then advanced to step S17. When the heating condition is not met in step S14 (NO in S14), the process of step S15 is not performed, and the process is advanced to step S17.
When determination is NO in step S11, the heating operation is continued in step S16, and then, the process is advanced to step S17.
In step S17, the process is returned back to the main routine.
Even when the indoor heating load is high and the room temperature drops due to the lack of heating capability only by the heating and humidification of outside air conditioner 4, control as shown in
On that occasion, as shown in t20 to t21 of
The above control can avoid the “conflicting state” while satisfying the target temperature humidity at a set time. This improves the controllability of a startup operation on a day, thus providing a system more convenient for a user.
As shown in
Heating capability Q_IU is sensed by inside-air-conditioner heating capability sensing unit 301 of inside air conditioner 2 before the heating and humidifying operation using outside air conditioner 4 is started. Inside-air-conditioner heating capability sensing unit 301 determines a flow rate Gr (kg/s) of the refrigerant and an enthalpy change Δh (kj/kg) of the refrigerant from a rotation speed of a compressor, a degree of opening of expansion valve 34 of inside air conditioner 2, and a pipe temperature of indoor heat exchanger 35, and calculates a heating capability Q_IU by Equation (1) below. The calculated heating capability Q_IU is stored once in storage unit 306 (such as an internal memory).
Q_IU=Gr*Δh (1)
In step S23, a current heating capability Q_FU of outside air conditioner 4 and a heating capability Q_FU1 during the heating and humidifying operation are subsequently calculated from the temperature effectiveness characteristics of ventilation heat exchanger 38 and the humidification amount characteristics of humidifier 43. Heating capability Q_FU is sensed by outside-air-conditioner heating capability sensing unit 303 of outside air conditioner 4. Outside-air-conditioner heating capability sensing unit 303 calculates heating capability Q_FU in the following process.
A temperature T_LO of air that has passed through total heat exchanger 42 is determined by Equation (2) below using a relationship between an air volume and temperature effectiveness of total heat exchanger 42 that is held in advance.
T_LO=T_OA−η_1*(T_OA−T_RA) (2)
where T_RA represents an indoor air temperature, T_OA represents an outside air temperature, and η_1 represents temperature effectiveness of total heat exchanger 42.
Subsequently, current heating capability Q_FU of outside air conditioner 4 is calculated by Equation (3) below using an air volume W[m3/s] of outside air conditioner 4, an air specific heat Cp [kJ/K*kg], and air density ρ (kg/m3). The calculated heating capability Q_FU is stored once in storage unit 306 (such as an internal memory).
Q_FU=W*Cp*p*(T_LO−T_RA) (3)
In this case, a heating capability Q supplied into the room is a sum of the heating capabilities of inside air conditioner 2 and outside air conditioner 4. That is to say, Q=Q_IU+Q_FU. This heating capability Q is stored once in storage unit 306 (such as an internal memory) as a heating load.
Suppose that the heating capability at the start of the heating and humidifying operation using outside air conditioner 4 is Q_FU1, a value obtained by subtracting Q_FU1 from Q described above is a heating load that cannot be processed by the heating capability of outside air conditioner 4. Suppose that the heating capability of inside air conditioner 2 is Q_IU1, the heating capability of inside air conditioner 2 is calculated by Equation (4), and inside air conditioner 2 is adjusted so as to achieve this heating capability.
Q_IU1=Q−Q_FU1 (4)
That is to say, a total heating capability Q is calculated from heating capability Q_FU of outside air conditioner 4 and heating capability Q_IU of inside air conditioner 2 before start of the heating and humidifying operation using outside air conditioner 4, and heating capability Q_FU1 of outside air conditioner 4 after start of the heating and humidifying operation is subtracted from this heating capability Q. Consequently, heating capability Q_IU1 of inside air conditioner 2 after start of the heating and humidifying operation using outside air conditioner 4 is determined, and inside air conditioner 2 is controlled so as to achieve heating capability Q_IU1, enabling more accurate processing of both of a heating load and a humidification load.
Steps S24, S25, S26, S27 and S28 are described by the corresponding text in the flowchart of
In an example of the method of adjusting heating capability Q_IU1 of inside air conditioner 2, a frequency of compressor 31 is manipulated. That is to say, a condensation temperature CT of the refrigerant rises by increasing the frequency of a compressor, leading to an increase in heating capability.
In an example of the method of determining heating capability Q_FU1 of outside air conditioner 4 used in Equation (4) above, temperature effectiveness characteristics of ventilation heat exchanger 38 and humidification amount characteristics of humidifier 43, described below, are used herein.
Controller 200 can calculate a temperature T_HEX_O of the air that has passed through ventilation heat exchanger 38, using a relationship between an air volume and temperature effectiveness of ventilation heat exchanger 38 which is held in advance in controller 200 (
In the use of
T_HEX_O=T_HEX_I−ηI*(T_HEX_I−CT) (5)
where T_HEX_I represents the temperature of air flowing into ventilation heat exchanger 38, and CT represents the condensation temperature of the refrigerant. T_HEX_I is determined by, for example, the temperature effectiveness of outside air temperature and humidity sensing unit 305 and the temperature effectiveness of total heat exchanger 42. CT is, for example, a refrigerant temperature measured by a temperature sensor placed in ventilation heat exchanger 38 and has a value substantially equal to the condensation temperature of the refrigerant.
Controller 200 holds a relationship between air temperature T_HEX_O after air has passed through ventilation heat exchanger 38 and humidification amount ΔX for each air volume (
Herein, humidification amount X1 is a difference between a target humidity and a current humidity. The current humidity can be sensed by, for example, a humidity sensor included in outside air conditioner 4.
Finally, as shown in
Herein, the solid line in
The estimated state of air SA includes temperature and humidity. The temperature of state SA is substituted for an air temperature SA_DB through the following process.
A heating amount Q_FU1 to be supplied into the room by outside air conditioner 4 can be calculated by Expression (6) below using an indoor dry-bulb temperature RA_DB [° C.], a temperature SA_DB [° C.] of air to be supplied into the room by outside air conditioner 4, an air volume W [m3/s] of outside air conditioner 4, an air specific heat Cp [kJ/K*kg], and an air density ρ [kg/m3].
Q_FU1[kW]=W*Cp*ρ*(SA_DB−RA_DB) (6)
A heating amount when outside air conditioner 4 performs the humidifying operation is also determined in a procedure similar to the procedure used when the heating and humidifying operation is performed. However, since the heating amount in ventilation heat exchanger 38 is zero, a calculation is made supposing T_HEX_O=T_HEX_I.
In order for inside air conditioner 2 and outside air conditioner 4 to avoid the “conflicting state,” controller 200 displays, for example, “during waste-avoided operation” on display 212 of remote control 202 to the user when the operation state is shifted as described above, thus allowing the user to understand that the indoor heating operation is stopped and heating capability is decreased in inside air conditioner 2.
<Configuration>
Air conditioning system 400 is similar to that of Embodiment 1 in configuration in that it includes outside air conditioner 4, which introduces and humidifies outdoor air, and supplies the humidified air into the room, and inside air conditioners 2A and 2B, which adjust the temperature of indoor air.
Although one outdoor unit is provided in Embodiment 1, air conditioning system 400 includes two outdoor units 401 and 402. Inside air conditioners 2A and 2B are connected to outdoor unit 401 by a refrigerant pipe 403. Outside air conditioner 4 is singly connected to outdoor unit 402 by refrigerant pipe 404.
Since the configurations of outdoor units 401 and 402 are identical to the configuration of outdoor unit 1 shown in
In Embodiment 2, outdoor units 401 and 402 are respectively included in inside air conditioner 2 and outside air conditioner 4. This allows the two outdoor units 401 and 402 to independently set a compressor frequency and a condensation temperature CT, so that the heating capabilities of inside air conditioner 2 and outside air conditioner 4 and the humidification capability of outside air conditioner 4 can be adjusted more easily than in Embodiment 1.
<Operations>
The operations in Embodiment 2 are similar to those in Embodiment 1 except for adjustment of heating capability and humidification capability. In other words, the operations in Embodiment 2 are similar to those in Embodiment 1 in that the “conflicting state” is avoided by processing a humidification load and then processing a heating load.
In Embodiment 1, a condensation temperature CT of the refrigerant is identical in inside air conditioner 2 and outside air conditioner 4. In Embodiment 2, however, condensation temperature CT can be set on each of the inside air conditioner 2 side and the outside air conditioner 4 side. For example, condensation temperature CT on the outside air conditioner 4 side is raised when the humidification capability of outside air conditioner 4 is increased. When the heating capability of inside air conditioner 2 is desired to be decreased in this case, control of decreasing condensation temperature CT on the inside air conditioner 2 side is performed.
The operations described with reference to
Embodiments 1 and 2 have been described above. Lastly, Embodiments 1 and 2 will be summarized again with reference to the drawings.
The air conditioning system includes a detection unit (temperature and humidity sensor 206, humidification load sensing unit 304), a ventilator (outside air conditioner 4), and an indoor unit (inside air conditioner 2). The detection unit is configured to detect the humidity of indoor air. As shown in
As described above, the indoor heating operation using inside air conditioner 2 is stopped depending on the magnitude of humidification load, and the heating and humidifying operation is performed using outside air conditioner 4 alone, thus proactively using the heating capability of outside air conditioner 4.
In other words, since indoor air is not heated more than necessary by inside air conditioner 2, the “conflicting state” in which the cooling and dehumidifying operation and the heating and humidifying operation are performed simultaneously can be prevented when the heating load is low and a humidification load is present.
As shown in
As shown in
Since an outdoor unit is included in each of inside air conditioner 2 and outside air conditioner 4 in the above configuration, the heating capability of inside air conditioner 2 and the humidification capability of outside air conditioner 4 can be controlled more widely. If a humidification load is present when the heating load is low, the indoor heating operation using inside air conditioner 2 is stopped, and the heating and humidifying operation is performed using outside air conditioner 4 alone. The indoor heating operation does not need to be completely stopped but may be operated more weakly than usual. If a humidification load is present in any case, operation electric power during the indoor heating operation is reduced more than when no humidification load is present. Thus, the heating capability of outside air conditioner 4 is used proactively, and indoor air is not heated by inside air conditioner 2 more than necessary. When the heating load is low and a humidification load is present, thus, the “conflicting state” in which the cooling and dehumidifying operation and the heating and humidifying operation are performed simultaneously can be prevented.
More preferably, when the humidity condition (detected humidity<threshold value) is met once as indicated at time t2 in
In the above configuration, inside air conditioner 2 stops operating, and the heating and humidifying operation is performed using outside air conditioner 4. Then, after the indoor humidification load has been processed, inside air conditioner 2 starts the indoor heating operation, and outside air conditioner 4 performs the humidifying operation. In this manner, a heating load and a humidification load can be processed while avoiding the “conflicting state.”
Preferably, as indicated at time t12 of
As described above, by setting a lower limit of room temperature for inside air conditioner 2, inside air conditioner 2 starts the indoor heating operation when the room temperature is equal to or lower than the lower limit while inside air conditioner 2 stops operating. This prevents a decrease in room temperature. A heating load and a humidification load can thus be processed more promptly, maintaining comfort.
The air conditioning system preferably further includes controller 200 that controls the indoor unit (inside air conditioner 2) and the ventilator (outside air conditioner 4). As shown in
As described above, the heating load and the humidification load can be processed by a predetermined time while avoiding the “conflicting state” by presetting the target temperature and humidity of indoor air at the predetermined time. The controllability upon startup in a day accordingly improves, so that a system more convenient for a user can be provided.
As shown in
As described above, the heating capability of inside air conditioner 2 capable of processing a heating load can be determined accurately by calculating a heating load and calculating the heating capability of outside air conditioner 4 during the heating and humidifying operation from the heating capabilities of inside air conditioner 2 and outside air conditioner 4. Thus, the heating load and the humidification load can be processed simultaneously while avoiding the “conflicting state,” providing a space comfortable for a user.
The air conditioning system preferably further includes display 212 that displays the operating states of the indoor unit (inside air conditioner 2) and the ventilator (outside air conditioner 4).
Displaying that inside air conditioner 2 and outside air conditioner 4 are in the operation state for avoiding the “conflicting state” as described above allows the user to understand that inside air conditioner 2 will stop the indoor heating operation or decrease the heating capability thereof, thus providing a system that a user can use without anxiety.
<Example Change in System Configuration>
For example, total heat exchanger 42 may not be provided in
It should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. It is therefore intended that the scope of the present invention is defined by claims, not only by the embodiments described above, and encompasses all modifications and variations equivalent in meaning and scope to the claims.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2016/067023 | 6/8/2016 | WO | 00 |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2017/212562 | 12/14/2017 | WO | A |
| Number | Name | Date | Kind |
|---|---|---|---|
| 8129662 | Cameron | Mar 2012 | B2 |
| 9810441 | Dean-Hendricks | Nov 2017 | B2 |
| 10775059 | Lee | Sep 2020 | B2 |
| 20150362200 | Hamada | Dec 2015 | A1 |
| 20170097165 | Yasuda | Apr 2017 | A1 |
| Number | Date | Country |
|---|---|---|
| H11-351730 | Dec 1999 | JP |
| 2002-195740 | Jul 2002 | JP |
| 2009-109151 | May 2009 | JP |
| WO 2014136199 | Sep 2014 | WO |
| Entry |
|---|
| International Search Report of the International Searching Authority dated Aug. 30, 2016 for the corresponding International application No. PCT/JP2016/067023 (and English translation). |
| Number | Date | Country | |
|---|---|---|---|
| 20190086113 A1 | Mar 2019 | US |
