WO2015173910A1

WO2015173910A1 - Air conditioning system

Info

Publication number: WO2015173910A1
Application number: PCT/JP2014/062833
Authority: WO
Inventors: 守濱田; 正樹豊島; 勇人堀江
Original assignee: 三菱電機株式会社
Priority date: 2014-05-14
Filing date: 2014-05-14
Publication date: 2015-11-19
Also published as: JPWO2015173910A1; JP6305525B2

Abstract

A ventilation device according to the present invention is provided with: a housing that has a supply air duct and an exhaust air duct; a total heat exchanger that is provided in the housing and causes the supply air and exhaust air to undergo total heat exchange; a switching means that is provided in the housing and switches between causing the exhaust air to undergo total heat exchange with the supply air and not doing so; a cooler that is connected to a refrigerant circuit and is provided further downstream in the supply air duct than the total heat exchanger; a refrigerant supply means that is connected to the refrigerant circuit and controls the supply of a refrigerant to the cooler; and a control unit that controls the switching means and refrigerant supply means on the basis of the temperature and humidity of exterior air in the supply air duct and the temperature and humidity of interior air in the exhaust air duct. The abovementioned configuration makes it possible, in an air conditioning system that performs exhaust heat recovery using a total heat exchange unit, to suppress power consumption more efficiently.

Description

Air conditioning system

The present invention relates to an air conditioning system.

The air conditioning system has, for example, a compressor, a four-way valve, an outdoor heat exchanger, an expansion unit, and an indoor heat exchanger, and an air conditioning apparatus including a refrigerant circuit configured by connecting these with a refrigerant pipe; Some have a ventilator with a cooler.

In the air conditioner, during cooling, the refrigerant compressed by the compressor becomes a high-temperature and high-pressure gas refrigerant and is sent to the outdoor heat exchanger. The refrigerant flowing into the outdoor heat exchanger is liquefied by releasing heat to the air. The liquefied refrigerant is decompressed by the expansion means to become a gas-liquid two-phase state, and is gasified by absorbing heat from ambient air in the indoor heat exchanger. On the other hand, since air is deprived of heat, the indoor space can be cooled. The gasified refrigerant returns to the compressor.

On the other hand, the ventilator is operated to replace indoor air with fresh outdoor air. During cooling, if the enthalpy of air introduced from the outside air is high, a cooling load (outside air load) occurs. Therefore, the outdoor air is temperature-controlled by the cooler of the ventilator and then introduced into the room.

At this time, the power consumption of the entire air conditioning system can be suppressed by changing the operation content of the ventilation device according to the outdoor air condition. For example, according to outdoor air conditions, a technology that switches between humidity control that supplies air into the room after adjusting the temperature with a cooler and simple ventilation that supplies air into the room without cooling with a cooler is proposed (For example, refer to Patent Document 1).

JP 2009-109088 A

However, since the technique described in Patent Document 1 is an air conditioning system that switches the outdoor air processing into two stages of simple ventilation operation and humidity control operation according to the outdoor air condition, it is highly efficient depending on the indoor air condition and the outdoor air condition. However, there is a problem that the outdoor air temperature cannot be controlled by switching the ventilation operation mode.

The present invention has been made to solve the above-described problems, and aims to suppress power consumption more efficiently in an air conditioning system that performs exhaust heat recovery by a total heat exchange unit.

An air conditioning system according to the present invention is an air conditioning system including a refrigerant circuit having an outdoor unit, an indoor unit, and a ventilation device. The ventilation device includes a housing having an air supply passage and an exhaust air passage, and a housing. Connected to the refrigerant circuit, a total heat exchanging part provided in the body for exchanging total heat between the supply air and the exhaust, a switching unit provided in the housing for switching whether or not the exhaust gas is exchanged for total heat with the supply air. A cooler provided downstream of the total heat exchanger in the supply air path, a refrigerant supply means connected to the refrigerant circuit and controlling supply of the refrigerant to the cooler, and outdoor air in the supply air path And a control unit for controlling the switching means and the refrigerant supply means based on the temperature and humidity of the air and the temperature and humidity of the indoor air in the exhaust air passage.

Since the air conditioning system according to the present invention has the above-described configuration, power consumption can be suppressed more efficiently in the air conditioning system that performs exhaust heat recovery by the total heat exchange unit.

It is the schematic of the air conditioning system 100 which concerns on Embodiment 1 of this invention. It is the schematic of the refrigerant circuit of the air conditioning system 100 which concerns on Embodiment 1 of this invention. It is an example of outline composition of ventilator 3 of air harmony system 100 concerning an embodiment of the invention. It is explanatory drawing of the three temperature / humidity ranges which the air conditioning system 100 which concerns on Embodiment 1 of this invention has. It is a block diagram of the control part 53 which the air conditioning system 100 which concerns on Embodiment 1 of this invention has. It is a figure which shows having divided in the three enthalpy ranges which the air conditioning system 100 which concerns on Embodiment 1 of this invention has. It is operation | movement explanatory drawing in each zone of the air conditioning system 100 which concerns on Embodiment 1 of this invention. It is an example of the control flowchart of the air conditioning system 100 which concerns on Embodiment 1 of this invention. It is the modification 1 of the air conditioning system 100 which concerns on Embodiment 1 of this invention. It is the modification 2 of the air conditioning system 100 which concerns on Embodiment 1 of this invention. It is operation | movement explanatory drawing in each zone of the air conditioning system 120 which concerns on Embodiment 2 of this invention. It is an example of the control flowchart of the air conditioning system 120 which concerns on Embodiment 2 of this invention.

Embodiments of the present invention will be described below.
Embodiment 1 FIG.
FIG. 1 is a schematic diagram of an air conditioning system 100 according to the first embodiment. A schematic configuration of the air conditioning system will be described with reference to FIG. Since the air-conditioning system 100 according to Embodiment 1 is premised on the configuration during cooling operation including outside air cooling, the configuration and operation in the cooling operation will be described below.
The air-conditioning system 100 according to Embodiment 1 is an air-conditioning system that performs exhaust heat recovery by the total heat exchange unit, and is provided with an improvement that can suppress power consumption more efficiently.

[Description of configuration]
The air conditioning system 100 includes one or a plurality of indoor units 1 and outdoor units 2, and the indoor unit 1 and the outdoor unit 2 are connected by a refrigerant pipe 101. The air conditioning system 100 includes one or a plurality of ventilation devices 3 and an outdoor unit 4, and the ventilation device 3 and the outdoor unit 4 are connected by a refrigerant pipe 102. In the first embodiment, a case where there are a plurality of indoor units 1 and a single ventilator 3 will be described as an example.
The indoor unit 1 and the ventilator 3 are used for air conditioning of a room, a room of a building, a warehouse, or the like, which is a space to be air-conditioned. The outdoor unit 2 and the outdoor unit 4 are heat source units that are installed outside a building or on the roof of a building, for example.

The air conditioning system 100 also includes a centralized controller 50 that controls the indoor unit 1, the outdoor unit 2, the ventilation device 3, and the outdoor unit 4. The centralized controller 50 is connected to the indoor unit 1, the outdoor unit 2, the ventilation device 3, and the outdoor unit 4 via a transmission line 51. In addition, it is possible to use wireless instead of the wired line like the transmission line 51.

FIG. 2 is a schematic diagram of a refrigerant circuit of the air conditioning system 100 according to the first embodiment. The air conditioning system 100 has two refrigerant circuits in which the refrigerant circulates. The first refrigerant circuit 11 has a compressor 12, a four-way valve 13, an outdoor heat exchanger 14, an expansion device 15, and an indoor heat exchanger 16, and these are connected by a refrigerant pipe to constitute a refrigeration cycle. is there. The outdoor heat exchanger 14 is provided with an outdoor fan 17, and the indoor heat exchanger 16 is provided with an outdoor fan 18. Each indoor unit 1 is provided with an expansion device 15, an indoor heat exchanger 16, and an outdoor fan 18.

The second refrigerant circuit 21 includes a compressor 22, a four-way valve 23, an outdoor heat exchanger 24, a throttling device 25, and a cooler 26, which are connected by a refrigerant pipe to constitute a refrigeration cycle. A blower 27 is attached to the outdoor heat exchanger 24. The expansion device 25 corresponds to a refrigerant supply unit used to control the supply of the refrigerant to the cooler 26.

FIG. 3 is a schematic configuration diagram of the ventilation device 3 of the air conditioning system 100 according to the present embodiment. As shown in FIG. 3, the ventilator 3 includes a housing 3A in which an air supply passage 3A1 and an exhaust air passage 3A2 are formed, a total heat exchanger 30 provided in the housing 3A, and a space outside the air-conditioning target space. An air supply blower 28 for taking air into the supply air passage 3A1 and an exhaust blower 29 for taking air in the air-conditioning target space into the exhaust air passage 3A2. Here, in the following description, air outside the air conditioning target space is referred to as outdoor air and air supply, and air in the air conditioning target space is also referred to as indoor air and exhaust. The ventilator 3 has a cooler 26 that cools the air in the supply air passage 3A1. The total heat exchanger 30 corresponds to the total heat exchange unit.

The ventilation device 3 is used to detect the temperature and humidity of the first temperature / humidity detection means 32 used to detect the temperature and humidity of the indoor air (exhaust), and the outdoor air (supply air). The second temperature / humidity detecting means 31 is provided. The detection results of the second temperature / humidity detection means 31 and the first temperature / humidity detection means 32 are output to the control unit 53 of the ventilation device 3.

The ventilation device 3 includes a bypass air passage 34 for discharging the indoor air taken into the exhaust air passage 3A2 from the air-conditioning target space from the housing 3A so as not to flow into the total heat exchanger 30, and the bypass air passage 34 side. And switching means 33 for switching between flowing air to the total heat exchanger 30 side. The switching means 33 can be constituted by, for example, an openable / closable damper portion for switching whether or not the exhaust air passage 3A2 and the bypass air passage 34 are communicated. When exhaust gas is caused to flow into the bypass air passage 34, the damper portion is rotated so as to open the opening on the bypass air passage 34 side. On the other hand, when the exhaust gas is caused to flow into the total heat exchanger 30, the damper portion closes the opening on the bypass air passage 34 side and operates the exhaust fan 29 to forcibly exhaust the exhaust gas to the total heat exchanger 30. Pull in.

FIG. 4 is an explanatory diagram of three temperature / humidity ranges of the air-conditioning system 100 according to the first embodiment. FIG. 4A shows three temperature / humidity ranges based on the detection result of the first temperature / humidity detection means 32 in the first time. FIG. 4B shows three temperature / humidity ranges based on the detection result of the first temperature / humidity detection means 32 at a second time after a preset time has elapsed from the first time. That is, the reason for shifting from the state of FIG. 4A to the state of FIG. 4B is that the air-conditioning target space is being cooled. With reference to FIG. 4, the structure of the three temperature-humidity ranges divided according to dry-bulb temperature and absolute humidity is demonstrated.

The ventilator 3 divides the outside air into three temperature / humidity ranges (first temperature / humidity range, second temperature / humidity range and first temperature / humidity range) as shown in FIG. 4 based on the detection results tin, xin of the first temperature / humidity detection means 32. 3 temperature range). In the figure, zone I corresponds to the first temperature / humidity range, zone II corresponds to the second temperature / humidity range, and zone III corresponds to the third temperature / humidity range.

Here, the thresholds for dividing the first temperature and humidity range from the second temperature and humidity range are t_lo and x_lo. The thresholds that separate the first temperature and humidity range from the third temperature and humidity range are t_hi and x_hi. That is, the control unit 53 of the ventilation device 3 determines the threshold value t_lo, the threshold value x_lo, the threshold value t_hi, and the threshold value x_hi based on the detection result of the first temperature / humidity detection unit 32. Since the threshold value t_lo, the threshold value x_lo, the threshold value t_hi, and the threshold value x_hi are determined based on the detection result of the first temperature / humidity detection means 32, the values change with time.

In addition, t_lo is smaller than the dry bulb temperature, which is the detection result of the first temperature / humidity detection means 32, by a first dry bulb temperature difference T1, which is a preset value, and t_hi is greater. The value is larger by the second dry bulb temperature difference T2, which is a preset value. Further, x_lo is smaller than the absolute humidity which is the detection result of the first temperature / humidity detection means 32 by a first absolute humidity difference X1 which is a preset value, and x_hi is preset. This is a value that is larger by the second absolute humidity difference X2, which is the measured value. The magnitudes of the first dry bulb temperature difference T1, the second dry bulb temperature difference T2, the first absolute humidity difference X1, and the second absolute humidity difference X2 can be appropriately set by the user.

Since the threshold value t_lo, the threshold value x_lo, the threshold value t_hi, and the threshold value x_hi are determined based on the detection result of the first temperature and humidity detection means 32, the values change with time, but the first dry bulb temperature difference T1, The dry bulb temperature difference T2, the first absolute humidity difference X1, and the second absolute humidity difference X2 are not changed.

Further, the ventilation device 3 determines which temperature / humidity range of the three temperature / humidity ranges the outside air (supply air) belongs to based on the detection result of the second temperature / humidity detection means 31. Here, the air conditioning system 100 is in a cooling operation so that the air-conditioning target space has a predetermined target temperature and a predetermined target humidity. For example, when the temperature of the air-conditioning target space decreases due to the cooling operation on the indoor unit 1 side, the detection result of the first temperature / humidity detection means 32 changes. Specifically, the position of the point A of the dry-bulb temperature and humidity of the indoor air corresponding to the detection result of the first temperature / humidity detection means 32 moves to the position of the point B shown in FIG. For this reason, the threshold value t_lo, the threshold value x_lo, the threshold value t_hi, and the threshold value x_hi change, that is, the first temperature / humidity range, the second temperature / humidity range, and the third temperature / humidity range change.

As shown in FIG. 4A, in the first time, the dry bulb temperature and humidity of the outdoor air corresponding to the detection result of the second temperature / humidity detection means 31 are the position of the point C. Since the point C belongs to the first temperature and humidity range, the ventilator 3 performs a first operation mode described later. On the other hand, as shown in FIG. 4B, in the second time after the first time, the dry bulb temperature and humidity of the indoor air corresponding to the detection result of the first temperature and humidity detection means 32 are changed. The position has moved from point A to point B. As shown in FIG. 4 (b), it can be seen that the first temperature / humidity range, the second temperature / humidity range, and the third temperature / humidity range are also moved accordingly. Also in the second time, it is assumed that the outside air condition has not changed from the first time. That is, even in the second time, the dry bulb temperature and humidity of the outdoor air corresponding to the detection result of the second temperature and humidity detection means 31 remain at the point C. Since the point C belongs to the second temperature / humidity range, the ventilator 3 performs a second operation mode described later.

More specifically, the first temperature / humidity range, the second temperature / humidity range, and the third temperature / humidity range are as follows.
(1) First temperature and humidity range (zone I)
The first temperature / humidity range is a range in which the dry bulb temperature is t_lo or less and the absolute humidity is less than x_lo in the air diagram.
(2) Second temperature and humidity range (Zone II)
The second temperature / humidity range is a range in which the dry bulb temperature is greater than t_lo and less than or equal to t_hi and the absolute humidity is greater than or equal to x_lo and less than x_hi in the air diagram.
(3) Third temperature / humidity range (zone III)
The third temperature / humidity range is a range in which the dry bulb temperature is higher than t_hi and the absolute humidity is x_hi or higher in the air diagram.

FIG. 5 is a block diagram of the control unit 53 included in the air conditioning system 100 according to the first embodiment. A detailed configuration of the control unit 53 will be described with reference to FIG.
The cooling load generated in the air-conditioning target space is large in the order of the first temperature / humidity range, the second temperature / humidity range, and the third temperature / humidity range. In the air conditioning system 100, the following operation mode is performed for each temperature and humidity range. That is, in the first temperature / humidity range, the ventilator 3 switches the switching means 33 so that the exhaust gas is not totally exchanged with the supply air, and the first operation mode in which the refrigerant is not supplied to the cooler 26 is performed. Execute. In the second temperature / humidity range, the ventilator 3 switches the switching means so that the exhaust does not exchange heat with the supply air, and executes the second operation mode in which the refrigerant is supplied to the cooler 26.

Based on the temperature and humidity of the outdoor air in the supply air passage 3A1 and the temperature and humidity of the outdoor air in the exhaust air passage 3A2, the control unit 53 switches the switching means 33 and switches the opening and closing of the expansion device 25 that is the refrigerant supply means. Is to control. That is, the control unit 53 switches the switching unit 33 and the refrigerant supply unit based on the detection results of the first temperature / humidity detection unit 32 and the second temperature / humidity detection unit 31. Then, the control unit 53 combines the switching of the switching unit 33 and the switching of the refrigerant supply unit based on the temperature and humidity of the outdoor air of the supply air passage 3A1 and the temperature and humidity of the indoor air of the exhaust air passage 3A2. Run the operation mode. In the first embodiment, the ventilator 3 combines the switching of the switching unit 33 and the switching of the refrigerant supply unit, so that three operation modes of the first operation mode, the second operation mode, and the third operation mode are performed. Execute.
The control unit 53 includes a calculation unit 53A, a range determination unit 53B, a storage unit 53C, a switching control unit 53D, and a diaphragm control unit 53E.

(Calculating means 53A)
Based on the detection result of the first temperature / humidity detection unit 32, the calculation unit 53A calculates the dry bulb temperature and the absolute value corresponding to each of the first temperature / humidity range, the second temperature / humidity range, and the third temperature / humidity range. The range of humidity is calculated. That is, the calculation unit 53A determines the values of the dry bulb temperature threshold value t_lo, the dry bulb temperature threshold value t_hi, the absolute humidity threshold value x_lo, and the absolute humidity threshold value x_hi based on the detection result of the first temperature and humidity detection unit 32. For the operation.

(Range determination means 53B)
Based on the detection result of the second temperature / humidity detection means 31, the range determination means 53B has the calculated dry bulb temperature and absolute humidity calculated by the calculation means 53A in the first temperature / humidity range and the second temperature / humidity. It is determined which of the range and the third temperature / humidity range corresponds to the range.

(Storage means 53C)
The storage means 53C stores various information. The storage unit 53C stores, for example, information on the first temperature / humidity range, the second temperature / humidity range, and the third temperature / humidity range calculated by the calculation unit 53A. The storage unit 53C can be configured with, for example, a hard disk, a flash memory, or the like.

(Switching control means 53D)
The switching control unit 53D switches the damper portion so that the exhaust flows through the bypass air passage 34 when the range determination unit 53B determines that the first temperature / humidity range or the second temperature / humidity range is set, and the third temperature When it is determined that the humidity is within the range, the damper portion is switched so that the exhaust gas flows through the total heat exchanger 30.

(Aperture control means 53E)
The expansion device control means 53E closes the expansion device 25, which is the refrigerant supply means, when the range determination means 53B determines that it is in the first temperature / humidity range, and in the second temperature / humidity range or the third temperature / humidity range. When it is determined that the expansion device 25 is present, the expansion device 25 as the refrigerant supply means is opened to a preset opening degree.

In the third temperature / humidity range, the ventilation device 3 switches the switching means 33 so that the exhaust air and the supply air exchange total heat, and switches the switching means 33 and supplies the refrigerant to the cooler 26. 3 operation mode is executed. As described above, in the air conditioning system 100, the operation mode performed by the ventilator 3 is set for each of the first temperature / humidity range, the second temperature / humidity range, and the third temperature / humidity range. In other words, in the air conditioning system 100, by selectively using a device that can reduce power consumption as much as possible according to the cooling load corresponding to each temperature and humidity range, the cooling capacity corresponding to the generated cooling load can be achieved. Power consumption can be suppressed while driving.

Conventional ventilators are known that do not include a total heat exchanger and adopt a control system that switches between humidity control operation and simple ventilation operation. In such a conventional ventilator, for example, in the third temperature and humidity range where a high cooling load is applied, the total heat exchanger 30 is not used, so by increasing the number of rotations of the compressor accordingly, It is necessary to ensure a sufficient cooling capacity with respect to the cooling load, which increases power consumption. However, in the air conditioning system 100 according to Embodiment 1, the total heat exchanger 30 can be used, and the increase in power consumption can be suppressed.

FIG. 6 is a diagram showing that the air conditioning system 100 according to Embodiment 1 is divided into three enthalpy ranges. FIG. 6A shows three enthalpy ranges based on the detection result of the first temperature / humidity detection means 32 in the first time. FIG. 6B shows an enthalpy range based on the detection result of the first temperature / humidity detection means 32 at a second time when a preset time has elapsed from the first time. That is, the reason for shifting from the state of FIG. 6A to the state of FIG. 6B is that the air-conditioning target space is being cooled.
In the description of FIG. 4, the control unit 53 is configured to divide the outside air into three temperature and humidity ranges as shown in FIG. 4 based on the detection results tin and xin of the first temperature and humidity detection unit 32. It is not limited. As shown in FIG. 6, it may be configured to divide into three enthalpy ranges instead of the temperature and humidity range. The mode of enthalpy can also be described in correspondence with the content described in FIG.

The threshold value that separates the first enthalpy range and the second enthalpy range is I_lo. The threshold value that separates the second enthalpy range and the third enthalpy range is I_hi. More specifically, it is as follows.
(1) First enthalpy range (zone I)
The first enthalpy range is a range in which the enthalpy value is I_lo or less in the air diagram.
(2) Second enthalpy range (Zone II)
The second enthalpy range is a range in which the enthalpy value is greater than I_lo and less than or equal to I_hi in the air diagram.
(3) Third enthalpy range (zone III)
The third enthalpy range is a range in which the enthalpy value is larger than I_hi in the air diagram.

The control unit 53 controls switching of the switching means 33 and switching of opening / closing of the expansion device 25 serving as the refrigerant supply means based on the enthalpy of outdoor air in the supply air passage 3A1 and the enthalpy of indoor air in the exhaust air passage 3A2. Is. Then, the control unit 53 combines the switching of the switching unit 33 and the switching of the refrigerant supply unit based on the enthalpy of the outdoor air of the supply air passage 3A1 and the enthalpy of the indoor air of the exhaust air passage 3A2, and thereby a plurality of operation modes. Execute.

In FIG. 6, the calculation means 53A calculates the enthalpy ranges corresponding to the first enthalpy range, the second enthalpy range, and the third enthalpy range based on the detection result of the first temperature and humidity detection means 32. calculate. That is, the calculation unit 53A performs a calculation for determining the values of the enthalpy threshold value I_lo and the enthalpy threshold value I_hi based on the detection result of the first temperature / humidity detection unit 32.
The range determination unit 53B calculates the enthalpy of the outside air based on the detection result of the second temperature / humidity detection unit 31. Then, the range determination unit 53B determines which of the first enthalpy range, the second enthalpy range, and the third enthalpy range calculated by the calculation unit 53A corresponds to the calculated enthalpy. .

In addition, I_lo is smaller than the enthalpy value calculated from the detection result of the first temperature / humidity detection means 32 by a first enthalpy difference I1, which is a preset value, and I_hi is greater in advance. The value is larger by the second enthalpy difference I2, which is the set value. The user can appropriately set the magnitudes of the first enthalpy difference I1 and the second enthalpy difference I2.

Since the enthalpy threshold I_lo and the enthalpy threshold I_hi are determined based on the detection result of the first temperature / humidity detection means 32, the values change with time, but the first enthalpy difference I1 and the second enthalpy difference I2 The size is not changed.

As shown in FIG. 6A, the enthalpy value corresponding to the detection result of the second temperature / humidity detection means 31 is the position of the point C at the first time. Since the point C belongs to the first enthalpy range, the ventilator 3 performs the first operation mode. On the other hand, as shown in FIG. 6B, at the second time after the first time, the enthalpy value corresponding to the detection result of the first temperature / humidity detection means 32 is changed from the point A to the point B. Has moved to. As shown in FIG. 6B, it can be seen that the first enthalpy range, the second enthalpy range, and the third enthalpy range are also moved accordingly. Also in the second time, it is assumed that the outside air condition has not changed from the first time. That is, the enthalpy value corresponding to the detection result of the second temperature / humidity detection means 31 remains at the point C even in the second time. Since the point C belongs to the second enthalpy range, the ventilator 3 performs the second operation mode.

[Description of operation by zone]
FIG. 7 is an operation explanatory diagram in each zone of the air-conditioning system 100 according to Embodiment 1. In FIG. 7A is an operation explanatory diagram in the zone I, FIG. 7B is an operation explanatory diagram in the zone II, and FIG. 7C is an operation explanatory diagram in the zone III.

(Regarding the first operation mode in zone I)
In the case of the first temperature / humidity range (first enthalpy range), the switching means 33 is opened and the room air is introduced into the bypass air passage 34, and the outside air (supply air) in the total heat exchanger 30 and the room Avoid heat exchange of air (exhaust). Further, the expansion device 25 is fully closed so that the cooler 26 does not exchange heat between the outside air and the refrigerant. In the case of the first temperature and humidity range, since the enthalpy of the inside air is lower than the enthalpy of the outside air, the outside air is directly supplied into the room, and the air conditioning system can obtain the outside air cooling effect. That is, the first operation mode is an outside air condition that allows cooling even when outside air is introduced into the room.

(About the second operation mode in Zone II)
In the case of the second temperature / humidity range (second enthalpy range), the switching means 33 is opened and the room air is introduced into the bypass air passage 34 in the same manner as the first temperature / humidity range. On the other hand, in the second temperature / humidity range, the expansion device 25 is opened and the cooler 26 exchanges heat between the outside air and the refrigerant. As a result, the outside air is cooled and dehumidified in the cooler 26 and supplied to the room.
In the second temperature / humidity range, the conditions of the dry bulb temperature and the absolute humidity of the indoor air and the outdoor air are close, and even if the total heat exchange is performed by the total heat exchanger 30, the total heat exchange amount decreases. Therefore, by bypassing the total heat exchanger 30 and stopping the exhaust air blower 29 to reduce the power of the exhaust air blower 29, energy saving can be achieved.

(About the third operation mode in Zone III)
In the case of the third temperature / humidity range (third enthalpy range), the switching means 33 is closed, the indoor air and the outside air are heat-exchanged by the total heat exchanger 30, and the expansion device 25 is opened for cooling. In the vessel 26, heat exchange between the outside air after passing through the total heat exchanger 30 and the refrigerant is performed. As a result, the outside air is cooled by the total heat exchanger 30, further cooled and dehumidified by the cooler 26, and supplied to the room.
In the third temperature and humidity range, the temperature or humidity of the outdoor air or the enthalpy is sufficiently higher than the indoor air, and the amount of heat exchange in the total heat exchanger 30 is increased. In the third operation mode, when the condition of the dry bulb temperature and the absolute humidity of the outside air is in the third temperature and humidity range, it is more energy efficient to recover the exhaust heat of the indoor air. Yes.

[Control Flow of Control Unit 53]
FIG. 8 is an example of a control flowchart of the air conditioning system 100 according to the first embodiment. FIG. 8 shows a control flow of air conditioning system switching. In step S1, indoor temperature and humidity are detected, and in step S2, zoning is performed. In step S3, the outside air temperature / humidity is detected, and in steps S4 and S5, it is determined which zone the current outside air is in. After the determination, the air conditioning system is switched in steps S6 to S8.

[Effects of Air Conditioning System 100 according to Embodiment 1]
The air conditioning system 100 according to Embodiment 1 implements the first operation mode, the second operation mode, and the third operation mode according to the load. That is, the ventilator 3 uses the first operation mode in which cooling is possible even when outside air is introduced into the room, and the exhaust fan 29 is stopped because the total heat exchange amount is small, and the cooler 26 is used for cooling. The second operation mode, and the third operation mode in which exhaust heat of the indoor air is recovered using not only the cooler 26 but also the total heat exchanger 30, and the exhaust heat of the indoor air can be reduced. The operation which utilized is carried out. As described above, the air-conditioning system 100 according to Embodiment 1 can realize more detailed operation using the total heat exchanger 30, and can suppress power consumption more efficiently.

Although Embodiment 1 demonstrated the aspect in which the ventilation apparatus 3 was provided with the 1st temperature / humidity detection means 32 and the 2nd temperature / humidity detection means 31, it is not limited to it.
It is only necessary that the air conditioning system 100 can acquire information corresponding to the detection result of the first temperature / humidity detection unit 32 and information corresponding to the detection result of the second temperature / humidity detection unit 31. For example, the air conditioning system 100 obtains temperature information in the air-conditioning target space and temperature information outside the air-conditioning target space from the outside, and uses them to determine whether the temperature / humidity ranges correspond to three temperature ranges (three enthalpy ranges). It is possible to determine and perform the first operation mode, the second operation mode, and the third operation mode.

In the first embodiment, the detection results of the first temperature / humidity detection unit 32 and the second temperature / humidity detection unit 31 are output to the control unit 53 of the ventilator 3, and the control unit 53 performs various calculations and various controls. However, the present invention is not limited to this. For example, the ventilation unit 3 is not provided with the control unit 53, and instead, the detection results of the first temperature / humidity detection unit 32 and the second temperature / humidity detection unit 31 are output to the centralized controller 50. Good. That is, it is good also as an aspect which implements the various calculations and various controls which the control part 53 of the ventilation apparatus 3 demonstrated in Embodiment 1 implements by the concentration controller 50 side.

[Modification 1]
FIG. 9 shows a first modification of the air-conditioning system 100 according to the first embodiment.
Further, as shown in FIG. 9, the air conditioning system 110 includes a compressor frequency adjusting means 41 for controlling the frequencies (rotations) of the compressor 12 and the compressor 22, and an evaporation temperature detecting means for detecting the temperature of the evaporator. 42. In the air conditioning system 110, control is performed so that the detection value of the evaporation temperature detecting means 42 becomes the target evaporation temperature. Even with this air conditioning system 110, the same effects as those of the air conditioning system 100 according to Embodiment 1 can be obtained.

[Modification 2]
FIG. 10 is a second modification of the air-conditioning system 100 according to the first embodiment.
Moreover, as shown in FIG. 10, even if it applies to the air conditioning system 111 of the aspect with which the indoor unit 1 and the ventilation apparatus 3 are connected to the same outdoor unit 2a via the refrigerant | coolant piping 104, it is in this Embodiment 1. The effect similar to the air conditioning system 100 which concerns can be acquired.

[Modification 3]
In the first embodiment, the case where the refrigerant supply means is the expansion device 25 has been described as an example. However, the present invention is not limited to this. For example, the refrigerant supply means may be the compressor 22. In this case, the control part 53 should just be provided with the compressor control means instead of the expansion device control means 53E. This compressor control means stops the compressor 22 when the range determination means 53B determines that it is in the first temperature and humidity range, and determines that it is in the second temperature and humidity range or the third temperature and humidity range. In this case, the compressor 22 is operated at a preset rotation speed. Also in this modification 3, the effect similar to the air conditioning system 100 which concerns on this Embodiment 1 can be acquired.

Embodiment 2. FIG.
FIG. 11 is an operation explanatory diagram in each zone of the air-conditioning system 120 according to the second embodiment. FIG. 12 is an example of a control flowchart of the air conditioning system 120 according to the second embodiment.
In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and different points will be mainly described. The air conditioning system 110 according to Embodiment 2 includes a rotary total heat exchanger 30 </ b> B instead of the total heat exchanger 30. In addition, the total heat exchanger 30B is a structure corresponding to a total heat exchange part.

In Embodiment 2, the switching means 33 has a motor unit 33B that rotates the total heat exchanger 30B that is a total heat exchange unit. The switching control unit 53D of the control unit 53 stops the motor unit 33B when the range determination unit 53B determines that it is in the first temperature / humidity range or the second temperature / humidity range, and is in the third temperature / humidity range. If it is determined, the motor unit 33B is switched so as to operate the motor unit 33B.

As shown in FIG. 11, the same effect as in the first embodiment can be obtained even when the total heat exchange unit is a rotary type. In the case of the rotary type, the total heat exchanger 30B is stopped from rotation without providing the switching means 33 having the damper portion and the bypass air passage 34, so that the total heat exchange between the outside air and the room air is prevented. I can do it. The control flow at this time is as shown in FIG. 12, and the damper opening in steps S6 to S8 in FIG. 8 is changed to stop the rotation of the total heat exchanger, and the damper closing is changed to the rotation of the total heat exchanger 30B.

[Effects of Air Conditioning System 120 According to Embodiment 2]
The air conditioning system 120 according to the second embodiment has the same effects as the air conditioning system 100 according to the first embodiment.

1 indoor unit, 2 outdoor unit, 2a outdoor unit, 3 ventilator, 3A housing, 3A1 supply air passage, 3A2 exhaust air passage, 4 outdoor unit, 11 first refrigerant circuit, 12 compressor, 13 four-way valve, 14 Outdoor heat exchanger, 15 throttle device, 16 indoor heat exchanger, 17 outdoor fan, 18 outdoor fan, 21 second refrigerant circuit, 22 compressor, 23 four-way valve, 24 outdoor heat exchanger, 25 throttle device, 26 cooling , 27 blower, 28 air supply blower, 29 exhaust blower, 30 total heat exchanger, 30B total heat exchanger, 31 second temperature and humidity detection means, 32 first temperature and humidity detection means, 33 switching means, 33B motor part, 34 bypass air passage, 41 compressor frequency adjustment means, 42 evaporation temperature detection means, 50 centralized controller, 51 transmission line, 53 control part, 53 Calculation means, 53B range determination means, 53C storage means, 53D switching control means, 53E throttle device control means, 100 air conditioning system, 101 refrigerant piping, 102 refrigerant piping, 104 refrigerant piping, 110 air conditioning system, 111 air conditioning system, 120 Air conditioning system.

Claims

An air conditioning system including a refrigerant circuit having an outdoor unit, an indoor unit, and a ventilation device,
The ventilator is
A housing having an air supply passage and an exhaust air passage;
A total heat exchanging portion provided in the housing for exchanging total heat between the supply air and the exhaust;
Switching means provided in the housing, for switching whether or not the exhaust gas is to be subjected to total heat exchange with the supply air;
A cooler connected to the refrigerant circuit and provided downstream of the total heat exchanger in the supply air path;
A refrigerant supply means connected to the refrigerant circuit for controlling supply of the refrigerant to the cooler;
A controller that controls the switching means and the refrigerant supply means based on the temperature and humidity of the outdoor air in the supply air path and the temperature and humidity of the indoor air in the exhaust air path;
Air conditioning system with
The controller is
A range below the first dry bulb temperature and lower than the first absolute humidity is defined as a first temperature and humidity range, which is below a second dry bulb temperature greater than the first dry bulb temperature and the first dry bulb temperature. A range that is greater than the dry bulb temperature, less than the second absolute humidity greater than the first absolute humidity, and greater than or equal to the first absolute humidity is defined as a second temperature and humidity range, and is greater than the second dry bulb temperature. When the range that is larger than the second absolute humidity is the third temperature and humidity range,
In the case of the first temperature and humidity range,
Switching the switching means so as not to exchange total heat with the supply air, and executing a first operation mode for switching the refrigerant supply means so as not to supply the refrigerant to the cooler;
In the case of the second temperature and humidity range,
Switching the switching means so as not to exchange total heat with the supply air, and executing a second operation mode for switching the refrigerant supply means to supply the refrigerant to the cooler;
In the case of the third temperature and humidity range,
2. The third operation mode is executed in which the switching unit is switched so that the exhaust gas and the supply air exchange total heat and the refrigerant supply unit is switched so as to supply the refrigerant to the cooler. Air conditioning system.
First temperature and humidity detection means for detecting the temperature and humidity of the indoor air in the exhaust air passage;
Second temperature / humidity detection means for detecting the temperature and humidity of the outdoor air in the supply air passage;
Further comprising
The controller is
Based on the detection results of the first temperature / humidity detection means and the second temperature / humidity detection means, the switching means and the refrigerant supply means are switched,
Based on the detection result of the first temperature / humidity detecting means, the dry bulb temperature and the absolute corresponding to the first temperature / humidity range, the second temperature / humidity range, and the third temperature / humidity range, respectively. A calculating means for calculating a humidity range;
The dry bulb temperature and the absolute humidity corresponding to the detection result of the second temperature / humidity detection means are the first temperature / humidity range, the second temperature / humidity range, and the third calculated by the calculation means. The air conditioning system according to claim 2, further comprising: a range determination unit that determines which of the temperature and humidity ranges falls within the range.
An air conditioning system including a refrigerant circuit having an outdoor unit, an indoor unit, and a ventilation device,
The ventilator is
A housing having an air supply passage and an exhaust air passage;
A total heat exchanging portion provided in the housing for exchanging total heat between the supply air and the exhaust;
Switching means provided in the housing, for switching whether or not the exhaust gas is to be subjected to total heat exchange with the supply air;
A cooler connected to the refrigerant circuit and provided downstream of the total heat exchanger in the supply air path;
A refrigerant supply means connected to the refrigerant circuit for controlling supply of the refrigerant to the cooler;
A control unit for controlling the switching means and the refrigerant supply means based on the enthalpy of the outdoor air in the supply air passage and the enthalpy of the indoor air in the exhaust air passage;
Air conditioning system with
The controller is
A range that is less than or equal to the first enthalpy is defined as a first enthalpy range, a second enthalpy that is greater than or equal to the first enthalpy, a range greater than the first enthalpy is defined as a second enthalpy range, and the second enthalpy range. When the range larger than the enthalpy of the third is the third enthalpy range,
In the case of the first enthalpy range,
Switching the switching means so as not to exchange total heat with the supply air, and executing a first operation mode for switching the refrigerant supply means so as not to supply the refrigerant to the cooler;
In the case of the second enthalpy range,
Switching the switching means so as not to exchange total heat with the supply air, and executing a second operation mode for switching the refrigerant supply means to supply the refrigerant to the cooler;
In the case of the third enthalpy range,
5. The third operation mode is performed in which the switching unit is switched so that the exhaust gas and the supply air exchange total heat, and the refrigerant supply unit is switched so as to supply the refrigerant to the cooler. Air conditioning system.
First temperature and humidity detection means for detecting the temperature and humidity of the indoor air in the exhaust air passage;
Second temperature / humidity detection means for detecting the temperature and humidity of the outdoor air in the supply air passage;
Further comprising
The controller is
Based on the detection results of the first temperature / humidity detection means and the second temperature / humidity detection means, the switching means and the refrigerant supply means are switched,
Calculation means for calculating an enthalpy range corresponding to each of the first enthalpy range, the second enthalpy range, and the third enthalpy range based on a detection result of the first temperature and humidity detection means;
The enthalpy calculated based on the detection result of the second temperature / humidity detection means is selected from the first enthalpy range, the second enthalpy range, and the third enthalpy range calculated by the calculation means. The air conditioning system according to claim 5, further comprising: a range determination unit that determines which range corresponds to the range.
In what the total heat exchange part is composed of a total heat exchanger,
The switching means is
A bypass air passage provided so as to bypass the total heat exchange section of the exhaust air passage;
An openable and closable damper portion that switches whether exhaust gas upstream of the total heat exchange portion of the exhaust air passage flows to the bypass air passage or to the total heat exchange portion is provided. The air conditioning system according to any one of the above.
The controller is
When the range determination means determines that the first temperature / humidity range or the second temperature / humidity range, the damper portion is switched so that the exhaust flows through the bypass air passage, and the third temperature / humidity The air conditioning system according to claim 7, further comprising a switching control unit that switches the damper unit so that the exhaust flows through the total heat exchange unit when it is determined that the range is within the range.
The total heat exchanging part is composed of a rotatable total heat exchanger,
The switching means is
The air conditioning system according to any one of claims 1 to 6, further comprising a motor unit that rotates the total heat exchange unit.
The controller is
The motor is stopped when the range determining means determines that it is the first temperature / humidity range or the second temperature / humidity range, and when it is determined that the range is the third temperature / humidity range, the motor The air conditioning system according to claim 9, which is dependent on claim 3 or 6, comprising switching control means for switching the motor unit so as to operate the unit.
The refrigerant supply means includes
A throttling device that is connected to the cooler and switches between supplying refrigerant to the cooler,
The controller is
When the range determining means determines that it is the first temperature / humidity range, the expansion device is closed, and when it is determined that the range is the second temperature / humidity range or the third temperature / humidity range, the expansion device. The air conditioning system according to any one of claims 3, 6, 8, 10, and claim 7, 9, which is dependent on claim 3, 6, comprising throttle device control means for opening the aperture.
The refrigerant supply means includes
A compressor for supplying a refrigerant to the cooler;
The controller is
The compressor is stopped when the range determining means determines that the temperature is within the first temperature / humidity range, and the compression is performed when it is determined that the temperature is within the second temperature / humidity range or the third temperature / humidity range. The air conditioning system according to any one of claims 3, 6, 8, 10, and claim 3, which depends on claim 3, 6, comprising compressor control means for operating the machine.