WO2016071951A1

WO2016071951A1 - Air conditioning system

Info

Publication number: WO2016071951A1
Application number: PCT/JP2014/079199
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: 2014-11-04
Filing date: 2014-11-04
Publication date: 2016-05-12
Also published as: JPWO2016071951A1; JP6490095B2

Abstract

This air conditioning system (100) is provided with an indoor unit (1) and a ventilation device (3). The air conditioning system (100) is configured such that, when both the indoor unit (1) and the ventilation device (3) are used to heat an interior (200), the heating amount of the device having the lowest heating capacity among the indoor unit (1) and the ventilation device (3) is controlled so as to be constant, and the heating amount of the device having the highest heating capacity among the indoor unit (1) and the ventilation device (3) is variably controlled.

Description

Air conditioning system

The present invention relates to an air conditioning system provided with a ventilation device.

Conventionally, there has been proposed a ventilator that heats outdoor air by heating means and supplies the heated air to the room to heat the room. Such a ventilator has a configuration in which the amount of heating is controlled based on, for example, the difference between the indoor set temperature and the outdoor temperature (see, for example, Patent Document 1).

In addition, conventionally, an air conditioning system in which an indoor unit that heats indoor air is installed in the room together with the ventilation device has been proposed.

JP 2010-249378 A

In the conventional air conditioning system, when the room is heated by both the indoor unit and the ventilator, each of the indoor unit and the ventilator operates independently. For this reason, the conventional air conditioning system has a problem that efficiency is deteriorated when the room is heated by both the indoor unit and the ventilation device.

Specifically, the heating load in the room where the ventilation device is installed is roughly “indoor heating load = outside air load + other heating load−internal heat generation”. The outside air load is a heating load generated by ventilation. Other heating loads are heating loads that occur due to heat leakage from walls, windows, etc., and heat leakage due to draft air. Internal heat generation includes heat generation from a human body, equipment, lighting, solar heat, and the like.

For example, when the outside air load is 20 [kW], the other heating load is 8 [kW], and the internal heat generation is 5 [kW], the indoor heating load is 20 [kW] +8 [kW] −5 [kW]. = 23 [kw]. At this time, assuming that the heating capacity of the ventilator is 20 [kW], the conventional air conditioning system operates the indoor unit and the ventilator independently, and therefore the ventilator has an external air load of 20 [kW]. Bear. Therefore, the indoor unit performs heating of 3 [kw].

Here, in general, the heating capacity of the indoor unit and the ventilation device increases as the air volume increases. Moreover, when generating the same heating amount, the larger the air volume, the better the efficiency. This is because the temperature of the heating means for heating the air can be reduced. In general, the indoor unit has a larger air volume than the ventilator. This is because it is desired to keep the air volume of the ventilator to the minimum necessary to prevent the outdoor air from entering the room and the indoor temperature from dropping too much. Therefore, in the case of the above example, the ventilation device having a low heating capacity generates a larger heating amount than the indoor unit having a high heating capacity, and the efficiency of the air conditioning system is deteriorated.

The present invention has been made to solve the above-described problems, and provides an air-conditioning system that can improve the efficiency of the room when both the indoor unit and the ventilator are heated. For the purpose.

An air conditioning system according to the present invention includes a first refrigeration cycle circuit having a first compressor, a first outdoor heat exchanger, a first expansion device, and a first indoor heat exchanger, and the first indoor as a first heating means. An indoor unit having a heat exchanger, heating indoor air by the first heating means and returning the indoor air to the room, and second heating means, and heating the outdoor air by the second heating means to And a control device for controlling the indoor unit and the ventilation device, wherein the control device is an air conditioning load estimating means for estimating the heating load in the room, and a storage means for storing a threshold value. The heating load estimated by the air conditioning load estimation means and the threshold value, and a heating amount control means for controlling the heating amount of the indoor unit and the ventilator, the heating amount control means, When the heating load is equal to or greater than the threshold, the indoor unit and Among the ventilation devices, the heating amount of the device with the lower heating capability is controlled to be constant, and the heating amount of the device with the higher heating capability of the indoor unit and the ventilation device is variably controlled. .

The air conditioning system according to the present invention controls the heating amount of a device having a lower heating capacity among the indoor unit and the ventilator when the room is heated by both the indoor unit and the ventilator. Of the ventilation devices, the heating amount of the device having the higher heating capacity is variably controlled. For this reason, the air conditioning system which concerns on this invention can improve efficiency rather than before, when heating an indoor with both an indoor unit and a ventilator.

It is the schematic of the air conditioning system which concerns on embodiment of this invention. It is a refrigerant circuit diagram which shows the refrigerating cycle circuit of the air conditioning system which concerns on embodiment of this invention. It is the schematic which shows the ventilation apparatus of the air conditioning system which concerns on embodiment of this invention. It is explanatory drawing for demonstrating the operation mode determination method of the air conditioning system which concerns on embodiment of this invention. It is explanatory drawing for demonstrating the operation mode at the time of the low heating load in the air conditioning system which concerns on embodiment of this invention. It is explanatory drawing for demonstrating another example of the operation mode at the time of the low heating load in the air conditioning system which concerns on embodiment of this invention. It is explanatory drawing for demonstrating the operation mode at the time of the high heating load in the air conditioning system which concerns on embodiment of this invention. It is a flowchart which shows the switching control of the operation mode at the time of the heating operation in the air conditioning system which concerns on this Embodiment. It is explanatory drawing for demonstrating another example of the operation mode at the time of the high heating load in the air conditioning system which concerns on embodiment of this invention. It is the schematic which shows another example of the ventilation apparatus of the air conditioning system which concerns on embodiment of this invention. It is explanatory drawing for demonstrating an example of the heating load estimation means in the air-conditioning load estimation means of the air conditioning system which concerns on embodiment of this invention. It is explanatory drawing for demonstrating another example of the operation mode determination method of the air conditioning system which concerns on embodiment of this invention. It is the schematic which shows an example according to the air conditioning system which concerns on embodiment of this invention. It is the schematic which shows another example of the ventilation apparatus of the air conditioning system which concerns on embodiment of this invention.

Embodiment.
FIG. 1 is a schematic diagram of an air conditioning system according to an embodiment of the present invention. FIG. 2 is a refrigerant circuit diagram showing a refrigeration cycle circuit of the air conditioning system. Moreover, FIG. 3 is the schematic which shows the ventilation apparatus of this air conditioning system.
Hereinafter, the configuration of the air-conditioning system 100 according to the present embodiment will be described with reference to FIGS. 1 and 2, an air conditioning system 100 including a plurality of indoor units 1 and one ventilator 3 is described. However, the number of indoor units 1 and ventilation devices 3 is merely an example, and the number of indoor units 1 may be one, or a plurality of ventilation devices 3 may be provided.

The air conditioning system 100 according to the present embodiment includes an indoor unit 1 and a ventilation device 3 installed in the same room 200. The indoor unit 1 heats the air in the room 200 with the first heating means and returns it to the room 200. The ventilator 3 heats the outdoor air with the second heating means and supplies it to the room 200. As shown in FIG. 3, the ventilation device 3 is provided with an OA temperature detection device 31 that detects the temperature of outdoor air (OA) and an RA temperature detection device 32 that detects the temperature of air (RA) in the room 200. It has been.
Here, the OA temperature detection device 31 corresponds to the outdoor temperature detection device of the present invention. The RA temperature detection device 32 corresponds to the indoor temperature detection device of the present invention. The installation positions of the OA temperature detection device 31 and the RA temperature detection device 32 are arbitrary, and may be provided outside the ventilation device 3.

Although details will be described later, the air conditioning system 100 according to the present embodiment includes a first refrigeration cycle circuit 11 and a second refrigeration cycle circuit 21. The indoor heat exchanger 16 of the first refrigeration cycle circuit 11 is used as the first heating means of the indoor unit 1, and the indoor heat exchanger 26 of the second refrigeration cycle circuit 21 is used as the second heating means of the ventilation device 3. Yes. For this reason, the air conditioning system 100 according to Embodiment 1 includes the outdoor unit 2 that houses a part of the configuration of the first refrigeration cycle circuit 11, and the outdoor unit 2 and the indoor unit 1 are connected by the refrigerant pipe 101. Connected. The air conditioning system 100 according to the present embodiment includes an outdoor unit 4 that houses a part of the configuration of the second refrigeration cycle circuit 21, and connects the outdoor unit 4 and the ventilator 3 with a refrigerant pipe 102. ing. That is, in the present embodiment, the indoor unit system is configured by the indoor unit 1 and the outdoor unit 2, and the ventilator system is configured by the ventilator 3 and the outdoor unit 4.

As shown in FIG. 2, the first refrigeration cycle circuit 11 includes a compressor 12, an outdoor heat exchanger 14, an expansion device 15, and an indoor heat exchanger 16. The first refrigeration cycle circuit 11 according to the present embodiment also includes a four-way valve 13 in order to realize both cooling and heating in the indoor unit 1.
Here, the compressor 12 corresponds to the first compressor of the present invention. The outdoor heat exchanger 14 corresponds to the first outdoor heat exchanger of the present invention. The expansion device 15 corresponds to the first expansion device of the present invention. The indoor heat exchanger 16 corresponds to the first indoor heat exchanger of the present invention.

The compressor 12 sucks refrigerant and compresses the refrigerant to a high temperature and high pressure state. The kind of the compressor 12 is not specifically limited, For example, the compressor 12 can be comprised using various types of compression mechanisms, such as a reciprocating, a rotary, a scroll, or a screw. The compressor 12 may be of a type that can be variably controlled by an inverter or the like. A four-way valve 13 is connected to the discharge port and the suction port of the compressor 12.

The four-way valve 13 switches the connection destination of the discharge port of the compressor 12 to one of the outdoor heat exchanger 14 or the indoor heat exchanger 16, and the suction port of the compressor 12 is switched to the outdoor heat exchanger 14 or the indoor heat exchanger 16. Switch to the other.

The outdoor heat exchanger 14 is an air heat exchanger that exchanges heat between the refrigerant flowing inside and the outdoor air. In the vicinity of the outdoor heat exchanger 14, an outdoor blower 17 that supplies outdoor air to be heat exchanged to the outdoor heat exchanger 14 may be provided. The outdoor heat exchanger 14 is connected to the indoor heat exchanger 16 via the expansion device 15.

The expansion device 15 is an expansion valve, for example, and expands the refrigerant by decompressing it.

The indoor heat exchanger 16 is an air heat exchanger that exchanges heat between the refrigerant flowing inside and the air in the room 200. In the vicinity of the indoor heat exchanger 16, an indoor blower 18 that supplies the air in the room 200 to be heat exchanged to the indoor heat exchanger 16 may be provided.
Here, the indoor blower 18 corresponds to the first blower of the present invention.

Each component of the first refrigeration cycle circuit 11 is housed in the indoor unit 1 and the outdoor unit 2. Specifically, the indoor unit 1 houses an expansion device 15, an indoor heat exchanger 16, and an indoor blower 18. The outdoor unit 2 houses a compressor 12, a four-way valve 13, an outdoor heat exchanger 14, and an outdoor blower 17. The installation position of the expansion device 15 is arbitrary and may be stored in the outdoor unit 2.

As shown in FIG. 2, the second refrigeration cycle circuit 21 includes a compressor 22, an outdoor heat exchanger 24, an expansion device 25, and an indoor heat exchanger 26. The second refrigeration cycle circuit 21 according to the present embodiment also includes a four-way valve 23 in order to realize both cooling and heating in the ventilation device 3.
Here, the compressor 22 corresponds to the second compressor of the present invention. The outdoor heat exchanger 24 corresponds to the second outdoor heat exchanger of the present invention. The expansion device 25 corresponds to the second expansion device of the present invention. The indoor heat exchanger 26 corresponds to the second indoor heat exchanger of the present invention.

The compressor 22 sucks the refrigerant and compresses the refrigerant to bring it into a high temperature and high pressure state. The kind of the compressor 22 is not specifically limited, For example, the compressor 22 can be comprised using various types of compression mechanisms, such as a reciprocating, a rotary, a scroll, or a screw. The compressor 22 may be of a type that can be variably controlled by an inverter or the like. A four-way valve 23 is connected to the discharge port and the suction port of the compressor 22.

The four-way valve 23 switches the connection destination of the discharge port of the compressor 22 to one of the outdoor heat exchanger 24 or the indoor heat exchanger 26, and the suction port of the compressor 22 is switched to the outdoor heat exchanger 24 or the indoor heat exchanger 26. Switch to the other.

The outdoor heat exchanger 24 is an air heat exchanger that exchanges heat between the refrigerant flowing inside and the outdoor air. In the vicinity of the outdoor heat exchanger 24, an outdoor fan 27 that supplies outdoor air to be heat exchanged to the outdoor heat exchanger 24 may be provided. This outdoor heat exchanger 24 is connected to an indoor heat exchanger 26 via an expansion device 25.

The expansion device 25 is an expansion valve, for example, and expands the refrigerant by decompressing it.

The indoor heat exchanger 26 is an air heat exchanger that exchanges heat between the refrigerant flowing inside and the outdoor air. An air supply fan 28 that takes outdoor air to be heat exchanged into the ventilation device 3 and supplies it to the indoor heat exchanger 26 may be provided around the indoor heat exchanger 26.
Here, the air supply fan 28 corresponds to the second fan of the present invention.

Each component of the second refrigeration cycle circuit 21 described above is housed in the ventilation device 3 and the outdoor unit 4. In detail, the expansion device 25, the indoor heat exchanger 26, and the air supply blower 28 are accommodated in the ventilation device 3. The outdoor unit 4 houses a compressor 22, a four-way valve 23, an outdoor heat exchanger 24, and an outdoor blower 27. The installation position of the expansion device 25 is arbitrary and may be stored in the outdoor unit 4.

Further, as shown in FIG. 1, the air conditioning system 100 according to the present embodiment includes a control device 40 that controls the indoor unit 1 and the ventilation device 3. The control device 40 is, for example, a microcomputer, and includes a storage unit 41, an air conditioning load estimation unit 42, and a condensation temperature control unit 43.

The storage unit 41 stores a set temperature that is a target temperature of the room 200, a threshold value used for heating amount control of the condensation temperature control unit 43, and the like.

The air conditioning load estimation means 42 is for estimating the heating load of the room 200. Here, the heating load of the room 200 is roughly “heating load of the room 200 = outside air load + other heating load−internal heat generation”. The outside air load is a heating load generated by ventilation. Other heating loads are heating loads that occur due to heat leakage from walls, windows, etc., and heat leakage due to draft air. Internal heat generation includes heat generation from a human body, equipment, lighting, solar heat, and the like. When the heating load is negative, it is a cooling load.

The condensation temperature control means 43 compares the heating load estimated by the air conditioning load estimation means 42 with the threshold value L0 stored in the storage means 41, and controls the heating amounts of the indoor unit 1 and the ventilation device 3. Specifically, when the heating load is equal to or greater than the threshold value L0, the condensing temperature control means 43 controls the heating amount of the indoor unit 1 and the ventilation device 3 with the lower heating capacity to be constant, and the indoor unit 1 and the ventilation. Of the devices 3, the heating amount of the device having the higher heating capacity is variably controlled. Further, when the heating load is smaller than the threshold value L0, the condensation temperature control means 43 stops heating one of the indoor unit 1 and the ventilating device 3 and variably controls the other heating amount of the indoor unit 1 and the ventilating device 3. To do.
Here, the condensing temperature control means 43 corresponds to the heating amount control means of the present invention.

As described above, the air conditioning system 100 according to the present embodiment uses the indoor heat exchanger 16 of the first refrigeration cycle circuit 11 as the first heating means of the indoor unit 1, and uses the second refrigeration cycle circuit 21. The indoor heat exchanger 26 is used as the second heating means of the ventilation device 3. For this reason, the condensation temperature control means 43 which concerns on this Embodiment controls the heating amount of the indoor unit 1 by controlling the condensation temperature of the 1st freezing cycle circuit 11. FIG. Specifically, the condensing temperature control means 43 controls the first refrigeration cycle circuit 11 by controlling at least one of the rotational speed of the compressor 12, the opening degree of the expansion device 15, and the rotational speed of the indoor blower 18. To control the condensation temperature. Further, the condensing temperature control means 43 controls the heating amount of the ventilator 3 by controlling the condensing temperature of the second refrigeration cycle circuit 21. Specifically, the condensation temperature control means 43 controls the second refrigeration cycle by controlling at least one of the rotational speed of the compressor 22, the opening degree of the expansion device 25, and the rotational speed of the air supply blower 28. The condensing temperature of the circuit 21 is controlled. The condensing temperature control means 43 is configured to be able to control the driving and stopping of the compressor 12, the indoor fan 18, the compressor 22, and the air supply fan 28.

Here, in general, the heating capacity of the indoor unit and the ventilation device increases as the air volume increases. Moreover, when generating the same heating amount, the larger the air volume, the better the efficiency. This is because the temperature of the heating means for heating the air can be reduced. In the air conditioning system 100 according to the present embodiment, the indoor unit 1 has a larger air volume than the ventilation device 3. This is to prevent outdoor air from entering the room 200 and causing the room temperature of the room 200 to decrease too much. Therefore, the condensation temperature control means 43 according to the present embodiment controls the heating amounts of the indoor unit 1 and the ventilation device 3 on the assumption that the indoor unit 1 is a device having a higher heating capacity than the ventilation device 3. Information about which apparatus has a higher heating capacity is stored in the storage means 41.

Further, the condensing temperature control means 43 according to the present embodiment, when variably controlling the heating amounts of the indoor unit 1 and the ventilating device 3, changes the set temperature and the detected value of the RA temperature detecting device 32 (in other words, the temperature of the indoor 200). The heating amount is controlled based on the difference from the room temperature.

Subsequently, the operation of the air conditioning system 100 according to the present embodiment will be described.

When the room 200 is cooled by the indoor unit 1, the first refrigeration cycle circuit 11 operates as follows.
The refrigerant compressed by the compressor 12 becomes a high-temperature and high-pressure gas refrigerant and is sent to the outdoor heat exchanger 14. The refrigerant that has flowed into the outdoor heat exchanger 14 is liquefied by releasing heat to the outdoor air. The liquefied refrigerant is decompressed by the expansion device 15 and becomes a gas-liquid two-phase state. The refrigerant that has been decompressed by the expansion device 15 and is in a gas-liquid two-phase state flows into the indoor heat exchanger 16 and absorbs heat from the air in the room 200 (by cooling the air in the room 200). Turn into. The gasified refrigerant returns to the compressor 12. On the other hand, the air cooled by the indoor heat exchanger 16 returns to the room 200 again. Thereby, the indoor unit 1 can cool the room 200.

Further, when the room 200 is heated by the indoor unit 1, the first refrigeration cycle circuit 11 operates as follows.
The refrigerant compressed by the compressor 12 becomes a high-temperature and high-pressure gas refrigerant. The high-temperature and high-pressure gas refrigerant compressed by the compressor 12 is sent to the indoor heat exchanger 16. The refrigerant flowing into the indoor heat exchanger 16 is liquefied by releasing heat to the air in the room 200 (by heating the air in the room 200). The liquefied refrigerant is decompressed by the expansion device 15 to be in a gas-liquid two-phase state, and is gasified by absorbing heat from the outdoor air in the outdoor heat exchanger 14. The gasified refrigerant returns to the compressor 12. On the other hand, the air heated by the indoor heat exchanger 16 returns to the room 200 again. As a result, the indoor unit 200 can be heated by the indoor unit 1.

Further, when the room 200 is cooled by the ventilator 3, the second refrigeration cycle circuit 21 operates as follows.
The refrigerant compressed by the compressor 22 becomes a high-temperature and high-pressure gas refrigerant and is sent to the outdoor heat exchanger 24. The refrigerant that has flowed into the outdoor heat exchanger 24 is liquefied by releasing heat to the outdoor air. The liquefied refrigerant is decompressed by the expansion device 25 and becomes a gas-liquid two-phase state. The refrigerant that has been decompressed by the expansion device 25 and is in a gas-liquid two-phase state flows into the indoor heat exchanger 26 and absorbs heat from the outdoor air taken into the ventilation device 3 (cools the outdoor air). Gasification). The gasified refrigerant returns to the compressor 22. On the other hand, the outdoor air cooled by the indoor heat exchanger 26 is supplied to the room 200. Thereby, the room 200 can be cooled by the ventilation device 3.

Further, when the room 200 is heated by the ventilator 3, the second refrigeration cycle circuit 21 operates as follows.
The refrigerant compressed by the compressor 22 becomes a high-temperature and high-pressure gas refrigerant. The high-temperature and high-pressure gas refrigerant compressed by the compressor 22 is sent to the indoor heat exchanger 26. The refrigerant flowing into the indoor heat exchanger 26 is liquefied by releasing heat to the outdoor air taken into the ventilation device 3 (by heating the outdoor air). The liquefied refrigerant is decompressed by the expansion device 25 to be in a gas-liquid two-phase state, and is gasified by absorbing heat from outdoor air in the outdoor heat exchanger 24. The gasified refrigerant returns to the compressor 22. On the other hand, the outdoor air heated by the indoor heat exchanger 26 is supplied to the room 200. Thereby, the room 200 can be heated by the ventilation device 3.

Here, as described above, the air conditioning system 100 according to the present embodiment varies the operation mode based on the heating load of the room 200 when the room 200 is heated.

Specifically, the air conditioning load estimation means 42 of the control device 40 estimates the heating load of the room 200. The condensing temperature control means 43 of the control device 40 compares the heating load estimated by the air conditioning load estimation means 42 with the threshold L0 stored in the storage means 41.

And as shown in FIG. 4, when the heating load of the room 200 is the zone 1 smaller than the threshold value L0, the condensation temperature control means 43 controls the indoor unit 1 and the ventilator 3 in the operation mode shown in FIG. Moreover, in the zone 2 where the heating load of the room 200 is equal to or higher than the threshold value L0, the condensation temperature control means 43 controls the indoor unit 1 and the ventilation device 3 in the operation mode shown in FIG.

Specifically, in the case of zone 1 at a low heating load, as shown in FIG. 5, when heating the room 200, the condensation temperature control means 43 stops heating the indoor unit 1, The room 200 is heated by variably controlling the heating amount. Specifically, the condensing temperature control unit 43 calculates a difference ΔT (= set temperature−detected value of the RA temperature detecting device 32) between the set temperature and the detected value of the RA temperature detecting device 32. Then, the condensation temperature control means 43 operates the second refrigeration cycle circuit 21 so that the condensation temperature of the second refrigeration cycle circuit 21 becomes CTmax when ΔT is ΔT> T1 [K]. Further, when ΔT is 0 [K] ≦ ΔT ≦ T1 [K], the condensation temperature control means 43 changes the condensation temperature of the second refrigeration cycle circuit 21 in accordance with the magnitude of ΔT, and the second refrigeration cycle. The circuit 21 is operated. Specifically, the condensation temperature control means 43 increases the condensation temperature of the second refrigeration cycle circuit 21 as ΔT increases, and operates the second refrigeration cycle circuit 21. The condensation temperature control means 43 operates the second refrigeration cycle circuit 21 so that the condensation temperature of the second refrigeration cycle circuit 21 becomes CTmin when ΔT is T2 [K] ≦ ΔT <0 [K]. . Moreover, the condensation temperature control means 43 stops the heating of the ventilator 3 when ΔT is ΔT <T2 [K]. That is, at least the compressor 22 of the second refrigeration cycle circuit 21 is stopped. When ΔT is ΔT <T2 [K], the indoor unit 200 performs the cooling operation of the room 200 because the room temperature of the room 200 is too high with respect to the set temperature.

Here, CTmax shown in FIG. 5 is the maximum condensation temperature at which the second refrigeration cycle circuit 21 can operate. This CTmax is determined by the breakdown voltage or the like. Further, CTmin shown in FIG. 5 is the lowest condensation temperature at which the second refrigeration cycle circuit 21 can operate. This CTmin is determined from the lower limit value of the temperature of the air blown out from the ventilator 3 and the minimum high / low pressure difference of the refrigerant allowed when the second refrigeration cycle circuit 21 is operated. Further, T1 is a temperature difference allowed for comfort, and is set to 1 [K], for example. T2 is a temperature difference ΔT at which heating of the ventilator 3 is stopped, and corresponds to the thermo OFF point. T2 is also a temperature difference allowed for comfort, and is set to 1 [K], for example.

With this operation, when the indoor 200 heating load is small (in the case of a low heating load), an increase in the cooling load of the indoor unit 1 due to excessive heating of the ventilation device 3 is prevented, and the power consumption of the air conditioning system 100 is reduced. The amount can be reduced.

In recent years, the insulation performance of buildings has improved. For this reason, in the case of a conventional air conditioning system, the room often has a cooling load even in winter when the enthalpy of air introduced from outside air is low. That is, in the case of the conventional air conditioning system, there is a problem that if the room is heated by the ventilator, the room is excessively heated to increase the cooling load on the indoor unit side. For example, it is assumed that the outside air load is 10 [kw] and the internal heat generation is 5 [kw]. Further, it is assumed that the other heating load is 2 [kw] due to the improvement of the heat insulation performance of the building. In this case, the indoor heating load (= outside air load + other heating load−internal heat generation) is 10 [kw] +2 [kw] −5 [kw] = 7 [kw]. At this time, in the conventional air conditioning system, since the indoor unit and the ventilator are each independently operated, the ventilator whose heating amount is controlled based on the difference between the indoor set temperature and the outdoor temperature is determined by ventilation. It bears all of the outside air load that is the heating load that occurs. For this reason, the indoor heating load (= outside air load + other heating load−internal heat generation) becomes 0 [kw] +2 [kw] −5 [kw] = − 3 [kw], and the room must be cooled with the indoor unit. I must.

On the other hand, in the air conditioning system 100 according to the present embodiment, the heating amount of the ventilation device 3 is controlled based on the difference between the set temperature of the room 200 and the room temperature of the room 200 as described above. . For this reason, the ventilator 3 can be operated so as to bear a part of the outside air load (for example, heating of 7 [kw]). For this reason, in the air conditioning system 100 according to the present embodiment, the heating load (= outside air load + other heating load−internal heat generation) of the room 200 is 3 [kw] +2 [kw] −5 [kw] = 0 [ kw], and cooling of the room 200 in the indoor unit 1 can be avoided. Therefore, the power consumption of the air conditioning system 100 can be reduced.

In the operation mode shown in FIG. 5, when ΔT is ΔT <T2 [K], heating of the ventilator 3 is stopped. In this case, the outside air having a low temperature may be directly supplied to the room 200, and the comfort of the room 200 may be reduced. In such a case, as shown in FIG. 6, even when ΔT is ΔT <T2 [K], the second refrigeration cycle circuit 21 is operated so that the condensation temperature of the second refrigeration cycle circuit 21 becomes CTmin. Also good.

On the other hand, in the case of zone 2 under a high heating load, as shown in FIG. 7, when heating the room 200, the condensation temperature control means 43 controls the heating amounts of both the indoor unit 1 and the ventilator 3.

Specifically, the ventilation device 3 having a low heating capacity is controlled to a constant heating amount as shown in FIG. That is, the condensation temperature control means 43 operates the second refrigeration cycle circuit 21 so that the condensation temperature of the second refrigeration cycle circuit 21 is constant at CTmin. In the operation for keeping the heating amount of the ventilation device 3 constant, the condensation temperature of the second refrigeration cycle circuit 21 does not necessarily have to be CTmin, and may be any condensation temperature between CTmax and CTmin.

In the indoor unit 1 having a high heating capacity, the heating amount is controlled variably. That is, the condensing temperature control means 43 calculates the difference ΔTi (= set temperature−detected value of the RA temperature detecting device 32) between the set temperature and the detected value of the RA temperature detecting device 32. Then, the condensation temperature control means 43 operates the first refrigeration cycle circuit 11 so that the condensation temperature of the first refrigeration cycle circuit 11 becomes CTmaxi when ΔTi is ΔTi> T1i [K]. Further, when ΔTi is 0 [K] ≦ ΔTi ≦ T1i [K], the condensing temperature control means 43 changes the condensing temperature of the first refrigeration cycle circuit 11 according to the magnitude of ΔTi, and thereby the first refrigeration cycle. The circuit 11 is operated. Specifically, the condensing temperature control means 43 increases the condensing temperature of the first refrigeration cycle circuit 11 as ΔTi increases, and operates the first refrigeration cycle circuit 11. Further, the condensation temperature control means 43 operates the first refrigeration cycle circuit 11 so that the condensation temperature of the first refrigeration cycle circuit 11 becomes CTmini when ΔTi is T2i [K] ≦ ΔTi <0 [K]. . Moreover, the condensation temperature control means 43 stops the heating of the indoor unit 1 when ΔTi is ΔTi <T2i [K]. That is, at least the compressor 12 of the first refrigeration cycle circuit 11 is stopped.

Here, CTmaxi shown in FIG. 7 is the maximum condensation temperature at which the first refrigeration cycle circuit 11 can operate. This CTmaxi is determined by the breakdown voltage or the like. Further, CTmini shown in FIG. 7 is the lowest condensation temperature at which the first refrigeration cycle circuit 11 can operate. This CTmini is determined from the lower limit value of the temperature of the air blown out from the indoor unit 1 and the minimum high / low pressure difference of the refrigerant allowed when the first refrigeration cycle circuit 11 is operated. T1i is a temperature difference allowed for comfort, and is set to 1 [K], for example. T2i is a temperature difference ΔTi for stopping the heating of the indoor unit 1, and corresponds to the thermo OFF point. T2i is also a temperature difference allowed for comfort, and is set to 1 [K], for example.

Finally, the operation mode switching control flow during heating operation in the air-conditioning system 100 according to the present embodiment will be described.

FIG. 8 is a flowchart showing operation mode switching control during heating operation in the air-conditioning system according to the present embodiment.
When the heating operation of the room 200 is started in the air conditioning system 100 (step S1), the air conditioning load estimation means 42 of the control device 40 estimates the heating load of the room 200 in step S2. In step S <b> 2, the condensation temperature control means 43 of the control device 40 compares the heating load estimated by the air conditioning load estimation means 42 with the threshold value L <b> 0 stored in the storage means 41.

When it is determined in step S2 that the heating load of the room 200 is smaller than the threshold L0, in step S3, the condensing temperature control means 43 performs the condensing temperature variable control (CT on the ventilator 3 side shown in FIG. 5 or FIG. 6. Variable control). Thereafter, the process proceeds to step S4, where the condensing temperature control means 43 determines whether or not the difference ΔT between the set temperature and the detected value of the RA temperature detecting device 32 is smaller than T2 [K].

When ΔT is ΔT <T2 [K] in step S4, the condensation temperature control means 43 performs the cooling operation of the room 200 by the indoor unit 1 in step S5, and returns to step S4. If T2 [K] ≦ ΔT in step S4, the condensation temperature control means 43 returns to step S2.

On the other hand, if it is determined in step S2 that the heating load of the room 200 is equal to or greater than the threshold value L0, in step S6, the condensing temperature control means 43 causes the condensing temperature control (CT constant control) on the ventilator 3 side as shown in FIG. ), The indoor unit 1 side performs the condensation temperature variable control (CT variable control). Then, it returns to step S2.

By performing such an operation, when the indoor 200 heating load is large (in the case of a high heating load), the efficiency of the air conditioning system 100 can be improved as compared with the conventional case.

For example, it is assumed that the outside air load is 20 [kw], the other heating load is 8 [kw], and the internal heat generation is 5 [kw]. In this case, the indoor heating load (= outside air load + other heating load−internal heat generation) is 20 [kw] +8 [kw] −5 [kw] = 23 [kw]. At this time, in the conventional air conditioning system, since the indoor unit and the ventilator are each independently operated, the ventilator whose heating amount is controlled based on the difference between the indoor set temperature and the outdoor temperature is determined by ventilation. It bears all of the outside air load that is the heating load that occurs. For this reason, the indoor heating load (= outside air load + other heating load−internal heat generation) is 0 [kw] +8 [kw] −5 [kw] = 3 [kw], and only 3 indoor units with high heating capacity are used. [Kw] will be heated. Therefore, a ventilation device with a low heating capacity generates a larger heating amount than an indoor unit with a high heating capacity, and the efficiency of the air conditioning system is deteriorated.

In contrast, in the air conditioning system 100 according to the present embodiment, as described above, the ventilation device 3 side performs constant condensation temperature control (CT constant control). For this reason, the ventilator 3 can be operated so as to bear a part of the outside air load (for example, heating of 5 [kw]). For this reason, in the air conditioning system 100 according to the present embodiment, the heating load of the room 200 (= outside air load + other heating load−internal heat generation) is 15 [kw] +8 [kw] −5 [kw] = 18 [ kw], and the indoor unit 1 having a high heating capacity heats 18 [kw]. Therefore, the efficiency of the air conditioning system 100 can be improved as compared with the prior art.

In step S6, the condensing temperature control means 43 determines the condensing temperature on the ventilator 3 side (of the second refrigeration cycle circuit 21) according to the condensing temperature on the indoor unit 1 side (condensing temperature on the first refrigeration cycle circuit 11). The condensing temperature) may be changed, and then the condensing temperature constant control (CT constant control) of the ventilation device 3 may be performed. For example, when the condensation temperature on the indoor unit 1 side is close to CTmaxi, the condensation temperature of the ventilator 3 is increased as shown in FIG. 9 (A), and the condensation on the indoor unit 1 side is shown in FIG. 9 (B). The temperature may be lowered. Thereby, you may make the air conditioning system 100 highly efficient. Further, for example, when the compressor 12 of the indoor unit 1 is repeatedly stopped and driven when the condensing temperature on the ventilator 3 side is constantly operated between CTmax and CTmin in step S6 (for example, the indoor unit 1 side) If the condensation temperature is close to CTmini), the condensation temperature on the ventilator 3 side may be lowered.

As described above, when the air conditioning system 100 according to the present embodiment heats the room 200 with both the indoor unit 1 and the ventilator 3, the heating amount of the ventilator 3 with a low heating capacity is controlled to be constant, and the heating capacity is The heating amount of the high indoor unit 1 is variably controlled. For this reason, the air conditioning system 100 which concerns on this Embodiment can improve efficiency rather than before, when heating the room | chamber interior 200 by both the indoor unit 1 and the ventilation apparatus 3. FIG.

In addition, when the ventilator 3 is provided in a room such as a hall where people are crowded, a large amount of ventilation is required, and thus the ventilator 3 may have a larger air volume than the indoor unit 1. That is, the heating capacity of the ventilator 3 may be higher than the heating capacity of the indoor unit 1. In such a case, when the room 200 is heated by both the indoor unit 1 and the ventilation device 3, that is, in the above-described step S6, the heating amount of the indoor unit 1 having a low heating capacity is controlled to be constant. What is necessary is just to control the heating amount of the high ventilation apparatus 3 variably. By doing in this way, the efficiency of the air conditioning system 100 can be improved compared with the past.

Further, the ventilation device 3 according to the present embodiment is not limited to the configuration shown in FIG. 3, and may be configured as shown in FIG. 10, for example.

FIG. 10 is a schematic diagram illustrating another example of the ventilation device of the air-conditioning system according to the embodiment of the present invention.
The ventilation device 3 shown in FIG. 10 includes an exhaust fan 29 and a total heat exchanger 30. That is, the ventilator 3 shown in FIG. 10 drives the exhaust fan 29 to take the air in the room 200 as the return air RA into the ventilator 3, passes the total heat exchanger 30, and then discharges the air EA. It is configured to discharge to the outside. The ventilator 3 shown in FIG. 10 has a configuration in which the outdoor air taken into the ventilator 3 flows into the total heat exchanger 30, exchanges heat with the return air RA, and then flows into the indoor heat exchanger 26. ing. By using the ventilation device 3 shown in FIG. 10, the heat stored in the air in the room 200 can be effectively used.

In addition, the air conditioning load estimation unit 42 according to the present embodiment does not particularly limit the method of estimating the heating load of the room 200, but for example, the detection value of the RA temperature detection device 32 and the detection of the OA temperature detection device 31 The heating load may be estimated based on the difference between the two values (the detected value of the RA temperature detecting device 32−the detected value of the OA temperature detecting device 31), that is, the difference between the indoor temperature and the outdoor temperature. In this case, as shown in FIG. 11, the heating load increases as the value of the room temperature-outdoor temperature increases. When the room temperature-outdoor temperature value is smaller than the threshold value L0, the zone 1 is set. When the room temperature-outdoor temperature value is equal to or higher than the threshold value L0, the zone 2 is set.

In the present embodiment, the operation mode of the air conditioning system 100 is determined using one threshold value L0. However, the operation mode of the air conditioning system 100 may be determined using a plurality of threshold values. Specifically, a plurality of threshold values may be stored in the storage unit 41, and the air conditioning load estimation unit 42 may determine the operation mode using different threshold values depending on the time zone. For example, two threshold values L0 and L1 may be stored in the storage unit 41 in consideration of solar heat as shown in FIG. And since there is a heating load reduction effect due to solar radiation during the day, the air conditioning load estimation means 42 may determine the operation mode using L1 having a value larger than L0 by the amount of solar heat. By doing in this way, it becomes possible to consider the load fluctuation part with and without solar radiation.

In the present embodiment, the configuration in which the heating amount of the indoor unit 1 and the ventilating device 3 is controlled by controlling the condensation temperature has been described. It is not limited.

FIG. 13 is a schematic diagram illustrating an example of each air conditioning system according to the embodiment of the present invention. In the air conditioning system 100 shown in FIG. 13, the indoor unit 1 includes a blowing temperature detection device 33 that detects the temperature of air blown from the indoor unit 1. In addition, the ventilator 3 includes a blowing temperature detection device 34 that detects the temperature of air blown from the ventilating device 3. The air conditioning system 100 shown in FIG. 13 controls the temperature of the air blown out from the indoor unit 1 and the ventilation device 3 by the heating amount control means 44 (corresponding to the condensation temperature control means 43) of the control device 40. By doing so, the heating amount of the indoor unit 1 and the ventilation device 3 is controlled. By increasing the temperature of the air blown from the indoor unit 1, the condensation temperature of the first refrigeration cycle circuit 11 is increased, and by reducing the temperature of the air blown from the indoor unit 1, the first refrigeration cycle circuit is increased. 11 condensation temperature is lowered. Further, by increasing the temperature of the air blown from the ventilator 3, the condensation temperature of the second refrigeration cycle circuit 21 is increased, and by lowering the temperature of the air blown from the ventilator 3, the second refrigeration is performed. The condensation temperature of the cycle circuit 21 is lowered. For this reason, the heating amount of the indoor unit 1 and the ventilator 3 can be controlled by controlling the temperature of the air blown out from the indoor unit 1 and the ventilator 3.
Here, the blowing temperature detecting device 33 corresponds to the first temperature detecting device of the present invention, and the blowing temperature detecting device 34 corresponds to the second temperature detecting device of the present invention.

Further, the second heating means provided in the ventilation device 3 may be other than the indoor heat exchanger 26 of the second refrigeration cycle circuit 21.

FIG. 14 is a schematic diagram illustrating still another example of the ventilation device of the air-conditioning system according to the embodiment of the present invention.
The ventilation device 3 shown in FIG. 14 includes an indoor heat exchanger 35 as the second heating means. The indoor heat exchanger 35 heats outdoor air taken into the ventilator 3 by heat generated by burning gas or the like. When the ventilator 3 shown in FIG. 14 is used, the heating amount of the ventilator 3 can be controlled by controlling the temperature of the air blown from the ventilator 3 as described in FIG. The reason why the indoor heat exchanger 26 of the second refrigeration cycle circuit 21 is provided in the ventilation device 3 shown in FIG. 14 is to cool the room 200 with the ventilation device 3. When the room 200 is not cooled by the ventilator 3, there is no need to provide the indoor heat exchanger 26 in the ventilator 3 (that is, the air conditioning system 100 needs to be provided with the second refrigeration cycle circuit 21).

1 indoor unit, 2 outdoor unit (indoor unit system), 3 ventilator, 4 outdoor unit (ventilator system), 11 first refrigeration cycle circuit, 12 compressor, 13 four-way valve, 14 outdoor heat exchanger, 15 expansion device , 16 Indoor heat exchanger, 17 Outdoor fan, 18 Indoor fan, 21 Second refrigeration cycle circuit, 22 Compressor, 23 Four-way valve, 24 Outdoor heat exchanger, 25 Expansion device, 26 Indoor heat exchanger, 27 Outdoor fan, 28 Blower for air supply, 29 Blower for exhaust, 30 Total heat exchanger, 31 OA temperature detector, 32 RA temperature detector, 33 Air outlet temperature detector, 34 Air outlet temperature detector, 35 Indoor heat exchanger, 40 Controller , 41 storage means, 42 air conditioning load estimation means, 43 condensing temperature control means, 44 heating amount control means, 100 air conditioning system, 10 Refrigerant pipe, 102 refrigerant pipe, 200 room.

Claims

A first refrigeration cycle circuit having a first compressor, a first outdoor heat exchanger, a first expansion device, and a first indoor heat exchanger;
An indoor unit having the first indoor heat exchanger as first heating means, and heating indoor air by the first heating means and returning the indoor air to the room;
A ventilator having second heating means, for heating outdoor air by the second heating means and supplying the air into the room;
A control device for controlling the indoor unit and the ventilation device;
With
The controller is
Air-conditioning load estimating means for estimating the indoor heating load;
Storage means for storing a threshold;
A heating amount control means for comparing the heating load estimated by the air conditioning load estimating means with the threshold value and controlling the heating amount of the indoor unit and the ventilation device;
Have
The heating amount control means includes:
When the heating load is equal to or greater than the threshold value, the heating amount of the indoor unit and the ventilator having a lower heating capacity is controlled to be constant, and the heating capacity of the indoor unit and the ventilator is high. An air conditioning system that is configured to variably control the heating amount of the other apparatus.
The heating amount control means includes
The configuration according to claim 1, wherein when the heating load is smaller than the threshold value, heating of one of the indoor unit and the ventilator is stopped, and the other heating amount of the indoor unit and the ventilator is variably controlled. The air conditioning system described.
The air conditioning system according to claim 1 or 2, wherein the heating amount control means is configured to control a heating amount of the indoor unit by controlling a condensation temperature of the first refrigeration cycle circuit.
The indoor unit includes a first temperature detection device that detects a temperature of air blown from the indoor unit,
The air conditioning system according to claim 1 or 2, wherein the heating amount control means is configured to control a heating amount of the indoor unit by controlling a temperature of air blown from the indoor unit.
A second refrigeration cycle circuit having a second compressor, a second outdoor heat exchanger, a second expansion device, and a second indoor heat exchanger;
The air conditioning system according to any one of claims 1 to 4, wherein the second indoor heat exchanger is used as the second heating means.
The ventilation device includes a second temperature detection device that detects a temperature of air blown from the ventilation device,
The heating amount control means is configured to control a heating amount of the ventilation device by controlling a temperature of air blown from the ventilation device. Air conditioning system.
The air conditioning system according to claim 5, wherein the heating amount control means is configured to control a heating amount of the ventilator by controlling a condensation temperature of the second refrigeration cycle circuit.
The indoor unit includes a first blower,
The ventilation device includes a second blower,
The indoor unit and the ventilator are
Of the first blower and the second blower, the side having the larger blower is the device having the higher heating capacity,
The air conditioning system according to any one of claims 1 to 7, wherein a side of the first blower and the second blower that has a blower having a smaller air volume is a device having a lower heating capacity. .
The air conditioning system according to any one of claims 1 to 8,
The air conditioning system includes an indoor temperature detection device that detects the temperature of the room,
The storage means is configured to store a set temperature in the room,
The heating amount control means includes
An air conditioning system configured to control the heating amount based on a difference between the set temperature and a detection value of the indoor temperature detection device when the heating amount of the indoor unit and the ventilation device is variably controlled.
The heating amount control means is configured to operate the apparatus at a minimum heating amount that can be operated when the heating amount of the apparatus having the lower heating capacity is controlled to be constant. The air conditioning system according to any one of the above.
The air conditioning system according to any one of claims 1 to 10,
The air conditioning system includes an indoor temperature detection device that detects the indoor temperature, and an outdoor temperature detection device that detects the temperature of outdoor air,
The air conditioning system is configured to estimate the heating load based on a difference between a detection value of the indoor temperature detection device and a detection value of the outdoor temperature detection device.
The storage means is configured to store a plurality of the threshold values,
The air conditioning system according to any one of claims 1 to 11, wherein the heating amount control means uses a different threshold value depending on a time zone.