KR19980076725A - Control method of HVAC and HVAC - Google Patents

Abstract

The present invention relates to a control method for a combined air conditioning and air conditioner and a combined air conditioning and air conditioner, comprising: a compressor for compressing a refrigerant; A first heat exchanger part connected to the compressor, a second heat exchanger part connected in series to the first heat exchanger part, and installed between the first heat exchanger part and the second heat exchanger part to control an throttling state and a developing state An indoor heat exchanger having an auxiliary expansion valve; An outdoor heat exchanger disposed between the compressor and the second heat exchanger unit; A main expansion valve disposed between the outdoor heat exchanger and the second heat exchanger portion; A bypass pipe for connecting the compressor between the outdoor heat exchanger and the main expansion valve; A bypass valve for opening and closing the bypass pipe; A switching valve for selecting a supply of refrigerant from the compressor to any one of a first heat exchanger unit and an outdoor heat exchanger; In the dehumidification operation, the refrigerant from the compressor condenses in the first heat exchanger unit, expands in the auxiliary expansion valve, evaporates in the second heat exchanger unit, and then forms a refrigerant circulation structure for returning to the compressor. And a control unit for controlling the main expansion valve, the auxiliary expansion valve, and the bypass valve. Thereby, the control method of the air-conditioning and air-conditioning apparatus for both a heating and heating which can perform a dehumidification operation | movement and improves the dehumidification speed, preventing the overcooling of a room is provided.

Description

Control method of HVAC and HVAC

The present invention relates to a control method of a combined air conditioning and air conditioner, and a control method of a combined air conditioning and air conditioner, which prevents overcooling of the room by generating warmth during dehumidification operation and improves the dehumidification speed. It is about.

An air conditioning and air conditioner using a refrigerant consists of a compressor, a refrigeration cycle in which the refrigerant is circulated sequentially by a condenser and an evaporator, and a heat pump cycle in which the flow of the refrigerant is reversely circulated, thereby cooling or heating the room. Accordingly, the air conditioning and air conditioner for cooling and heating has an indoor unit which is installed indoors and blows cold and warm air to the room by a refrigerant, and an outdoor unit which is installed outdoors and heat exchanged.

9 is a configuration diagram of a conventional air conditioner, and FIG. 10 is a cross-sectional view of the indoor unit 101 of the conventional air conditioner. The indoor unit 101 includes a main body having an inlet 112 for sucking air from the room and a discharge port 113 for discharging cold or warm air into the room, and an indoor heat exchanger 103 installed adjacent to the inlet for heat exchange. And a blower fan 106 installed on the rear surface of the indoor heat exchanger 103 to suck air through the intake port and discharge the heat-exchanged air to the room through the indoor heat exchanger 103.

The outdoor unit 102 includes a compressor 107 for compressing a refrigerant at high temperature and high pressure, an outdoor heat exchanger 108 for exchanging refrigerant from the compressor 107 or a refrigerant from the indoor heat exchanger 103, and an outdoor heat exchanger ( The cooling fan 109 which blows the air heat-exchanged from 108 is provided. Meanwhile, a capillary tube 141 is provided between the indoor heat exchanger 103 and the outdoor heat exchanger 108 to throttle and expand the refrigerant flow, and the indoor heat exchanger 103 and the outdoor heat exchanger connected to the compressor 107 are provided. Between the 108 is provided a switching valve 140 to guide the direction of the refrigerant from the compressor 107.

In such an air conditioning and air conditioner, when a user selects a heating operation mode and performs a heating operation, the refrigerant compressed to high temperature and high pressure in the compressor 107 is aired to the indoor heat exchanger 103 by the switching valve 140. . The refrigerant heat-exchanged by the indoor heat exchanger (103) is cooled and converted into a low-temperature high-pressure liquid refrigerant, and the refrigerant passes through the capillary tube (141) to expand and phase-convert to a low-temperature low-pressure refrigerant gas. The refrigerant gas is heat-exchanged in the outdoor heat exchanger 108 to absorb heat from the surroundings, thereby raising the temperature and returning to the compressor 107 again.

In such a heating operation, the air around the outdoor heat exchanger 108 is cooled by the condensed refrigerant by heat exchange with the outdoor cold air, and moisture condenses on the outer surface of the outdoor heat exchanger 108 to form frost. . Accordingly, when the temperature of the outdoor heat exchanger 108 is less than or equal to a predetermined temperature, the air conditioning and heating device performs defrosting operation. The defrosting operation is performed by the outdoor heat exchanger 108 using the refrigerant compressed by the compressor 107 as in the cooling operation. The frost formed on the outer surface of the outdoor heat exchanger 108 is removed by the introduced high temperature and high pressure refrigerant to perform defrosting. Then, the refrigerant passes through the capillary tube and passes through the indoor heat exchanger 103 to exchange heat to lower the indoor air temperature and return to the compressor 107. Therefore, during the defrosting operation, there is a problem that the heating operation is impossible and the cooling operation is performed so that the temperature of the room decreases and heat loss occurs.

On the other hand, during the cooling operation of the air conditioner, the compressor 107 is driven to compress the refrigerant at high temperature and high pressure, and the compressed refrigerant is revolved into the outdoor heat exchanger 108 by a switching valve, and condensed by the outdoor heat exchanger to the capillary tube. It will flow in. The refrigerant introduced into the capillary tube expands through the capillary tube and changes into a low-temperature low-pressure gas refrigerant. The gas refrigerant passes through the indoor heat exchanger 103 and heat-exchanges with the indoor air to increase the temperature. The air in the room is cooled by passing the room heat exchanger 103 by the fan 106. The refrigerant having passed through the indoor heat exchanger (103) is repeatedly introduced into the compressor (107) to be repeatedly compressed at high temperature and high pressure.

During the cooling operation, when the outdoor temperature and the indoor temperature are not relatively high and the humidity of the room is high, the dehumidification operation is performed. As in the cooling operation, the refrigerant compressed in the compressor 107 is switched to the outdoor heat exchanger by a switching valve. The refrigerant condensed in the outdoor heat exchanger 108 passes through the capillary tube 141 and is cooled to low temperature and low pressure to pass through the indoor heat exchanger 103. The refrigerant passes through the indoor heat exchanger (103) and exchanges heat with the humid indoor air introduced by the blower fan (106), and the moisture mixed with the indoor air cools and condenses on the surface of the indoor heat exchanger (103). The phase-converted and dehumidified air is discharged to the room. By the way, in this dehumidification operation, as shown in Fig. 8, the temperature is lowered from ta ℃ to tb ℃ and the absolute humidity is reduced from Xa to Xb, but when the absolute humidity decreases, the temperature is also lowered so that the amount of saturated steam The decrease in relative humidity decreases. That is, because the same process as the cooling operation, the room temperature is excessively cooled and the rate of decrease in relative humidity is low, the user may feel uncomfortable or cold. Accordingly, the rotation of the blower fan 106 is operated at a low speed so that less cold air is discharged during the dehumidification operation. When the blower fan 106 is operated at a low speed, the dehumidification amount decreases and the circulation of the indoor air is not smooth. There is a problem that it takes a long time. In addition, during the defrosting operation, there is a problem in that the heating operation is not performed and the heat of the room is lost.

Accordingly, it is an object of the present invention to provide a control method of an air conditioning and air conditioning unit for both heating and cooling, which can prevent heat loss in a room during dehumidification operation and improve a dehumidification speed.

1 is a schematic configuration diagram of an air conditioner according to the present invention for explaining a refrigerant flow during heating operation and defrosting operation,

2 is a schematic configuration diagram of an air conditioner for explaining a refrigerant flow in a cooling operation and a dehumidification operation;

3 is a schematic cross-sectional view of an indoor unit of an air conditioner according to the present invention;

4 is a control block diagram of an air conditioner according to the present invention;

5 is a control flow chart during the heating operation of the air conditioner according to the present invention,

6 is a control flow chart during the cooling operation;

7 is a control flow chart during dehumidification operation;

8 is an application graph of the wet air chart according to the present invention,

9 is a configuration diagram of a conventional air conditioner,

10 is a cross-sectional view of an indoor unit of a conventional air conditioner.

Explanation of symbols for main parts of the drawings

4: 1st heat exchanger part 5: 2nd heat exchanger part

7: compressor 8: outdoor heat exchanger

10: control unit 21: outdoor temperature sensor

24: Inlet pipe temperature sensor 25: Indoor pipe temperature sensor

26: outdoor piping temperature sensor 33: bypass piping

34: inlet pipe 35: indoor side pipe

36: outdoor side pipe 37: discharge pipe

40: switching valve 41: main expansion valve

42: auxiliary expansion valve 43: bypass valve

The above object, according to the present invention, in the air conditioning and air conditioning equipment, a compressor for compressing a refrigerant; A first heat exchanger part connected to the compressor, a second heat exchanger part connected in series to the first heat exchanger part, and installed between the first heat exchanger part and the second heat exchanger part to control an throttling state and a developing state An indoor heat exchanger having an auxiliary expansion valve; an outdoor heat exchanger disposed between the compressor and the second heat exchanger unit; A main expansion valve disposed between the outdoor heat exchanger and the second heat exchanger portion; A bypass pipe for connecting the compressor between the outdoor heat exchanger and the main expansion valve; A bypass valve for opening and closing the bypass pipe; A switching valve for selecting a supply of refrigerant from the compressor to any one of a first heat exchanger unit and an outdoor heat exchanger; In the dehumidification operation, the refrigerant from the compressor condenses in the first heat exchanger unit, expands in the auxiliary expansion valve, evaporates in the second heat exchanger unit, and then forms a refrigerant circulation structure for returning to the compressor. And, a control unit for controlling the main expansion valve, the auxiliary expansion valve, and the bypass valve.

The control unit may be configured to open the flow path from the compressor to the first heat exchanger and to block the flow path to the outdoor heat exchanger during the dehumidification operation, and the main expansion valve and the bypass valve may be in an expanded state. The auxiliary expansion valve is controlled in a throttle state, and during cooling operation, the refrigerant from the compressor is condensed in the outdoor heat exchanger, expands in the main expansion valve, and evaporates in the second heat exchanger unit and the first heat exchanger unit. The switching valve, the main expansion valve, the auxiliary expansion valve, and the bypass valve may be controlled to form a refrigerant circulation loop returning to the compressor.

The control unit may further include: the switching valve blocks the flow path to the first heat exchanger unit and opens the flow path to the outdoor heat exchanger during the cooling operation, the bypass valve is in a throttled state, and the auxiliary expansion valve is deployed. Can be brought to a state. In the heating operation, the refrigerant from the compressor is condensed in the first heat exchanger unit and the second heat exchanger unit, expands in the main expansion valve, evaporates in the outdoor heat exchanger, and then returns to the compressor. Preferably, the switching valve, the main expansion valve, the auxiliary expansion valve, and the bypass valve are controlled to form a loop.

In the defrosting operation, the controller controls the switching valve, the bypass valve and the main expansion valve so that refrigerant from the compressor is condensed in the outdoor heat exchanger and forms a flow path that returns to the compressor along the bypass pipe. The auxiliary expansion valve can be controlled. Preferably, the switching valve opens the flow path to the outdoor heat exchanger and blocks the flow path to the first heat exchanger portion, the bypass valve is in the expanded state, and the main expansion valve is in the throttled state. Do.

The switching valve may include a discharge pipe through which the refrigerant discharged from the compressor flows, an indoor side pipe connected to the first heat exchanger unit, an outdoor side pipe connected to the outdoor heat exchanger, and the compressor connected to the compressor. The heat exchanger unit or the inlet pipe into which the refrigerant from the outdoor heat exchanger flows is connected.

On the other hand, the above object, according to another field of the present invention, a heating circulation loop having a compressor, an indoor heat exchanger, a main expansion valve, and an outdoor heat exchanger, which are sequentially connected to each other, and the refrigerant from the compressor is directed to the indoor heat exchanger; In the control method of the air-conditioning and air conditioning equipment capable of switching the air circulation loop to the outdoor heat exchanger, the indoor heat exchanger is divided into a first heat exchanger unit and a second heat exchanger unit, and the first heat exchanger unit and the second heat exchanger. Providing an auxiliary expansion valve between the bases, and a refrigerant flow path for allowing refrigerant from the compressor to expand in the auxiliary expansion valve through the first heat exchanger section and then to evaporate in the second heat exchanger section in a dehumidifying operation. It can also be achieved by a control method for a combined air conditioning and heating equipment, characterized in that it comprises a step of forming.

In the cooling operation, the refrigerant from the compressor is condensed in the outdoor heat exchanger, expands in the main expansion valve, evaporates in the second heat exchanger unit and the first heat exchanger unit, and then returns to the compressor. It is possible to form a loop. In the heating operation, the refrigerant from the compressor condenses in the first heat exchanger unit and the second heat exchanger unit, expands in the main expansion valve, evaporates in the outdoor heat exchanger, and then returns to the compressor. Can be formed. On the other hand, during the defrosting operation, the refrigerant from the compressor is condensed in the outdoor heat exchanger, it is preferable to form a flow path for returning to the compressor along the bypass pipe.

An air conditioning and air conditioner using a refrigerant consists of a compressor, a refrigeration cycle in which the refrigerant is circulated sequentially by a condenser and an evaporator, and a heat pump cycle in which the flow of the refrigerant is reversely circulated, thereby cooling or heating the room. Accordingly, the air conditioning and air conditioner for cooling and heating has an indoor unit which is installed indoors and blows cold and warm air to the room by a refrigerant, and an outdoor unit which is installed outdoors and heat exchanged.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a schematic configuration diagram of an air conditioner according to the present invention illustrating a refrigerant flow during heating and defrosting operation, Figure 2 is a schematic configuration diagram of an air conditioner illustrating a refrigerant flow during cooling operation and dehumidification operation, Figure 3 Is a schematic cross-sectional view of an indoor unit of an air conditioner according to the present invention. The indoor unit (1) of the air-conditioning / air-conditioning equipment is composed of a refrigerant and an indoor air sucked into the intake port in a main body having an intake port (12) for sucking indoor air from the inside and an outlet (13) for discharging heat exchanged indoor air. It has the 1st heat exchanger part 4 and the 2nd heat exchanger part 5 which are indoor heat exchangers 3 which change the temperature of a room by heat exchange. The first heat exchanger part 4 and the second heat exchanger part 5 are formed in a V shape, and the air sucked into the intake port between the first heat exchanger part 4 and the second heat exchanger part 5 is an indoor heat exchanger ( Blowing fan (6) is installed to heat exchange through 3) and then discharge to the discharge port. In addition, an auxiliary expansion valve 42 serving as a capillary tube is installed in the pipe between the first heat exchanger part 4 and the second heat exchanger part 5, and the auxiliary expansion valve 42 and the second heat exchanger part ( 5) Indoor piping temperature sensor 25 is installed between.

On the other hand, the outdoor unit (2) has a compressor (7) for compressing the refrigerant at a high temperature and high pressure, and an outdoor heat exchanger (8) consisting of a plurality of heat transfer fins and piping through which the refrigerant flows, and on the back of the outdoor heat exchanger (8) The cooling fan 9 which blows heat-exchanged air is provided. And, the casing of the outdoor unit 2 is provided with an outdoor temperature sensor 21 for sensing the outdoor temperature (tair).

On the other hand, a main expansion valve 41 serving as a capillary tube is provided on the pipe of the outdoor heat exchanger 8 facing the second heat exchanger portion 5 of the indoor unit 1, and is compressed and discharged from the compressor 7. The discharge pipe 37 through which the refrigerant passes is provided with a switching valve 40 for switching the flow path of the refrigerant flowing from the compressor 7 to the indoor heat exchanger 3 or the outdoor heat exchanger 8.

The switching valve 40 includes a discharge pipe 37 through which the refrigerant discharged from the compressor 7 flows, an indoor side pipe 35 facing the first heat exchanger unit 4, and an outdoor side facing the outdoor heat exchanger 8. The pipe 36 is connected, and the inflow pipe 34 of the compressor 7 into which the refrigerant from the first heat exchanger unit 4 or the outdoor heat exchanger 8 flows is connected. In addition, a bypass pipe 33 is provided between the inlet pipe 34 of the compressor 7 and the main expansion valve 41, and a bypass for opening and closing the bypass pipe 33 on the bypass pipe 33. The valve 43 is provided. On the other hand, an inlet pipe temperature sensor 24 is provided in the inlet pipe 34 adjacent to the compressor 7, and an outdoor pipe temperature sensor 26 is also installed in the pipe adjacent to the outdoor heat exchanger 8.

4 is a control block diagram of an air conditioner according to the present invention. The control unit 10 formed of a microcomputer is installed on the outside of the air conditioning and air conditioning equipment, and the display unit 15 having an operation key, and an outdoor and indoor pipe temperature sensor 25 attached to a pipe in the air conditioning equipment to sense a temperature; , And receives information from the outdoor temperature sensor 21 and the inlet pipe temperature sensor 24. Then, according to the input information, the main expansion valve 41 and the auxiliary expansion valve 42, the bypass valve 43, the switching valve 40 and the compressor 7, the blowing fan 6 and the cooling fan A control signal is output to each drive circuit for driving (9) to appropriately control the valves 40, 41, 42, 43, the fans 6, 9, the compressor 7, and the like.

5 is a control flow chart during the heating operation of the air conditioner according to the present invention, Figure 6 is a control flow chart during the cooling operation, Figure 7 is a control flow chart during the dehumidification operation. When the air conditioner for the air conditioner is selected by the user by operating the operation key of the display unit 15 (S100), the cooling operation, the heating operation or the dehumidification operation is performed according to the selection mode. First, when the heating operation mode is selected (Q10), the control unit 10 causes the switching valve 40 to open the indoor side pipe 35 from the compressor 7 to the first heat exchanger unit 4, and the auxiliary expansion valve. (42) is placed in a deployed state and the bypass valve 43 is closed (Q20). Then, the compressor 7, the blowing fan 6, and the cooling fan 9 are driven (Q30, Q40), and the refrigerant compressed at high temperature and high pressure from the compressor 7 is exchanged with the first heat exchanger unit 4 for the second heat exchange. Pass through the base (5). At this time, the indoor air and the high temperature and high pressure refrigerant exchange heat by the driving of the blower fan 6, the high temperature and high pressure refrigerant condenses at low temperature and high pressure, and the indoor air takes the latent heat of condensation from the refrigerant and the temperature rises. The refrigerant condensed in this way is condensed at low temperature and low pressure while passing through the main expansion valve (41) and flows into the outdoor heat exchanger (8), and returns to the compressor (7) along the outdoor side pipe (36) and the inlet pipe (34). do.

At this time, the control unit 10 is to compare the temperature value detected by the inlet pipe temperature sensor 24 and the outdoor pipe temperature sensor 26 and the outdoor temperature sensor 21 (Q50), and the first outdoor temperature (tair) and By comparing the temperature difference between the outdoor pipe (Q60) and comparing the inlet pipe temperature (t _s ) with the outdoor pipe temperature (t ₁ ) when the temperature difference between the outdoor temperature (tair) and the outdoor pipe temperature (t ₁ ) is less than 10 ° (Q70, Q80). As a result of comparison, when the inflow pipe temperature t _s is 5 ° C. higher than the outdoor pipe temperature t ₁ , the control unit 10 maintains the auxiliary expansion valve 42 in a deployed state and continues heating operation (Q75). However, when the inlet pipe temperature t _s is 5 ° C. or more higher than the outdoor pipe temperature t ₁ , the controller 10 increases the opening degree of the main expansion valve 41 to reduce cooling of the refrigerant (Q85), When the difference between the inlet pipe temperature t _s and the outdoor pipe temperature t ₁ is less than 5 ° C., the opening of the main expansion valve 41 is lowered to increase the cooling of the refrigerant (Q90). Then, the temperature detected by the outdoor pipe temperature sensor 26, the inlet pipe temperature sensor 24, and the outdoor pipe temperature sensor 26 is again compared (Q50), and heating operation is performed.

During the heating operation, when the outdoor temperature tair is 10 ° C. or more higher than the outdoor pipe temperature t ₁ , the controller 10 determines that frost has occurred in the outdoor heat exchanger 8, and switches to the defrost mode. When the defrost mode is switched, the control unit 10 opens the switching valve 40 toward the outdoor heat exchanger 8, causes the main expansion valve 41 and the auxiliary expansion valve 42 to throttle, and bypass valves. Opening (43) (Q61) and stopping the blowing fan (6) and cooling fan (9) (Q62). Accordingly, the refrigerant compressed by the high temperature and high pressure in the compressor 7 flows into the outdoor heat exchanger 8 along the outdoor side pipe 36 to melt frost formed on the surface of the outdoor heat exchanger 8, and the refrigerant Returns to the compressor 7 along the bypass pipe 33. Then, the controller 10 detects the outdoor pipe temperature t ₁ by the outdoor pipe temperature sensor 26 (Q64), and continues to defrost if the detected outdoor pipe temperature t ₁ is 10 ° C. or less, If the temperature is 10 ° C or higher, the driving of the compressor 7 is stopped, the compressor 7 is rested for 2 minutes (Q65, Q66), and then returned to the heating mode.

On the other hand, when the cooling operation mode is selected (P10), the control unit 10 opens the switching valve 40 so that the compressor 7 and the outdoor heat exchanger 8 communicate with each other, and expands the auxiliary expansion valve 42. The pass valve 43 is closed (P20). When the compressor 7, the blower fan 6, and the cooling fan 9 are driven by the controller 10 (P30 and P40), the refrigerant compressed by the high temperature and high pressure in the compressor 7 is transferred to the outdoor side pipe 36. A) is introduced into the outdoor heat exchanger (8) to condense into a liquid refrigerant of low temperature and high pressure, and pass through the main expansion valve (41) to condense into a gas refrigerant of low temperature and low pressure. The condensed gas refrigerant passes through the second heat exchanger unit 5 and the first heat exchanger unit 4 and exchanges heat with the indoor air, whereby the temperature of the indoor air decreases. Here, the refrigerant having risen in temperature returns to the compressor 7 along the indoor side pipe 35 and the inlet pipe 34.

At this time, the controller 10 is to compare the temperature value detected by the inlet pipe temperature sensor 24 and the indoor pipe temperature sensor 25 (P50, P70), the inlet pipe temperature (t _s ) is the indoor pipe temperature ( If it is 5 ° C. higher than t ₂ ), the auxiliary expansion valve 42 maintains the expanded state and continues the cooling operation (P65). However, if the inlet pipe temperature t _s is 5 ° C. or more higher than the room pipe temperature t ₂ , the controller 10 increases the opening degree of the main expansion valve 42 to reduce cooling of the refrigerant (P75), and When the difference between the piping temperature t _s and the indoor piping temperature t ₂ is 5 ° C. or less, the opening of the main expansion valve 42 is decreased to increase the cooling of the refrigerant (P80). Then, the controller 10 detects and compares the inlet pipe temperature t _s and the indoor pipe temperature t ₂ again and continues the cooling operation (P50).

When the user selects the dehumidification operation mode (S10), the control unit 10 causes the switching valve 40 to open toward the first heat exchange unit, deploys the main expansion valve 41 and throttles the auxiliary expansion valve 42. The bypass valve 43 is opened (S20), the compressor 7 and the blowing fan 6 are driven, and the cooling fan 9 is stopped (S30, S40). Accordingly, the refrigerant from the compressor 7 flows into the first heat exchanger unit 4 along the indoor side pipe 35, and the refrigerant is condensed into liquid refrigerant of low temperature and high pressure by heat exchange with indoor air. Accordingly, the indoor air, as shown in Figure 5, the temperature rises from ta ℃ to td ℃, the refrigerant is expanded through the auxiliary expansion valve 42 and flows into the second heat exchanger (5). The introduced refrigerant absorbs heat from the indoor air and evaporates, and the indoor air passes through the second heat exchanger part 5 to deprive heat, and moisture in the indoor air condenses on the outer surface of the second heat exchanger part 5, The refrigerant is returned to the compressor 7 along the bypass pipe 33. At this time, the indoor air temperature is lowered from ta ℃ to tc ℃ by the heat exchange of the second heat exchanger unit 5, the actual temperature of the indoor air is affected by the heat exchange in the first heat exchanger unit 4 ta The temperature rises from 占 폚 to tb 占 폚. Accordingly, absolute humidity decreases from Xa to Xb, relative humidity decreases from ￠ a to ￠ b, and the enthalpy of indoor air increases from ha to hb.

On the other hand, the control unit 10 receives and compares the temperature value detected from the inlet pipe temperature sensor 24 and the indoor pipe temperature sensor 25 (S50, S70), the inlet pipe temperature (t _s ) is the indoor pipe temperature ( If t ₂ ) is higher than 5 ℃ to maintain the throttling state of the auxiliary expansion valve 42 and continue the heating operation (S65). If the inlet pipe temperature t _s is 5 ° C. or higher than the room pipe temperature t ₂ , the controller 10 increases the opening degree of the auxiliary expansion valve 42 (S75), and the inlet pipe temperature t _s is increased. When the difference between the indoor piping temperature t ₂ is 5 ° C. or less, the opening degree of the auxiliary expansion valve 42 is lowered (S80). Then, the controller 10 compares the temperature value detected by the inlet pipe temperature sensor 24 and the indoor pipe temperature sensor 25 again to perform a dehumidification operation (S50).

In the air conditioner according to this configuration, the refrigerant used for the defrosting action in the outdoor heat exchanger 8 during the defrosting operation does not flow into the indoor unit, but immediately returns to the compressor 7, and since the cool air is not discharged to the room, a decrease in the indoor temperature is achieved. Is prevented. In the dehumidification operation, the heat exchange is performed in the first heat exchanger part 4 to increase the indoor air temperature, and the dehumidification action is performed through the heat exchange of the second heat exchanger part 5. It can be shortened and the relative humidity can be lowered while maintaining the indoor temperature, thereby maintaining a comfortable indoor condition.

As described above, according to the present invention, a dehumidification operation is possible while preventing overcooling of a room, and a control method of a combined air conditioning and air conditioning apparatus for improving a dehumidification speed is provided.

Claims (13)

In the air conditioning and heating equipment, A compressor for compressing the refrigerant, A first heat exchanger part connected to the compressor, a second heat exchanger part connected in series to the first heat exchanger part, and installed between the first heat exchanger part and the second heat exchanger part to control an throttling state and a developing state An indoor heat exchanger having an auxiliary expansion valve; An outdoor heat exchanger disposed between the compressor and the second heat exchanger unit; A main expansion valve disposed between the outdoor heat exchanger and the second heat exchanger; A bypass pipe connecting the compressor with the outdoor heat exchanger and the main expansion valve; A bypass valve for opening and closing the bypass pipe, A switching valve for selecting a supply of refrigerant from the compressor to either the first heat exchanger unit or the outdoor heat exchanger; In the dehumidification operation, the refrigerant from the compressor condenses in the first heat exchanger unit, expands in the auxiliary expansion valve, evaporates in the second heat exchanger unit, and then forms a refrigerant circulation structure for returning to the compressor. And a control unit for controlling the main expansion valve, the auxiliary expansion valve, and the bypass valve. The method of claim 1, The control unit may be configured to open the flow path from the compressor to the first heat exchanger and to block the flow path to the outdoor heat exchanger during the dehumidification operation, wherein the main expansion valve and the bypass valve are in a developed state. An air conditioning and heating equipment for controlling an auxiliary expansion valve to be in a throttled state. The method of claim 1, The control unit, the refrigerant from the compressor is condensed in the outdoor heat exchanger in the cooling operation, expands in the main expansion valve to evaporate in the second heat exchanger unit and the first heat exchanger unit, the refrigerant circulation loop to return to the compressor And a control unit for controlling the switching valve, the main expansion valve, the auxiliary expansion valve, and the bypass valve to form a valve. The method of claim 3, wherein The control unit may be configured to block the flow path to the first heat exchanger and to open the flow path to the outdoor heat exchanger during the cooling operation, the bypass valve to the throttled state, and the auxiliary expansion valve to the expanded state. Air conditioning equipment for both heating and cooling, characterized in that. The method of claim 1, The control unit, the refrigerant from the compressor is condensed in the first heat exchanger unit and the second heat exchanger unit during the heating operation, expands in the main expansion valve, evaporates in the outdoor heat exchanger, and then returns to the compressor And an air conditioning apparatus for controlling the switching valve, the main expansion valve, the auxiliary expansion valve, and the bypass valve so as to form a circulation loop. The method of claim 5, The control unit is configured to open the flow path to the first heat exchanger and to block the flow path to the outdoor heat exchanger during the heating operation, the auxiliary expansion valve to the developed state, and the bypass valve to the throttle state. Air conditioning equipment for both heating and cooling, characterized in that. The method of claim 1, The control unit may include the switching valve, the bypass valve, the main expansion valve, to form a flow path in which the refrigerant from the compressor is condensed in the outdoor heat exchanger and returns to the compressor along the bypass pipe during the defrosting operation. An air conditioning and heating device, characterized in that for controlling the auxiliary expansion valve. The method of claim 7, wherein The control unit may be configured to open the flow path to the outdoor heat exchanger and to block the flow path to the first heat exchanger unit during defrosting operation, the bypass valve to the expanded state, and the main expansion valve to the throttle state. Air conditioning equipment for both heating and cooling, characterized in that. The method according to any one of claims 1 to 8, The switching valve may include a discharge pipe through which the refrigerant discharged from the compressor flows, an indoor side pipe connected to the first heat exchanger unit, an outdoor side pipe connected to the outdoor heat exchanger, and the first heat exchanger connected to the compressor. Air conditioning equipment for both heating and heating, characterized in that the inlet pipe is connected to the base or the refrigerant from the outdoor heat exchanger. A compressor, an indoor heat exchanger, a main expansion valve, and an outdoor heat exchanger, which are sequentially connected to each other, are capable of forward and reverse switching of a cooling circulation loop directed from the compressor to the indoor heat exchanger and a cooling circulation loop directed to the outdoor heat exchanger. In the control method of the air conditioning equipment Dividing an indoor heat exchanger into a first heat exchanger portion and a second heat exchanger portion, and providing an auxiliary expansion valve between the first heat exchanger portion and the second heat exchanger portion; And a refrigerant flow path for expanding the refrigerant from the compressor in the auxiliary expansion valve through the first heat exchanger unit and then evaporating the second heat exchanger unit during the dehumidification operation. Control method of equipment. The method of claim 10, During the cooling operation, the refrigerant from the compressor condenses in the outdoor heat exchanger, expands in the main expansion valve, evaporates in the second heat exchanger portion and the first heat exchanger portion, and then forms a refrigerant circulation loop that returns to the compressor. Control method of a combined air conditioning and heating device, characterized in that. The method of claim 10, During the heating operation, the refrigerant from the compressor is condensed in the first heat exchanger unit and the second heat exchanger unit, expands in the main expansion valve, evaporates in the outdoor heat exchanger, and forms a refrigerant circulation loop that returns to the compressor. Control method of a combined air conditioning and heating device, characterized in that. The method of claim 10, And a flow path for condensation of refrigerant from the compressor in the outdoor heat exchanger and return to the compressor along the bypass pipe during the defrosting operation.