JPH06101894A - Air-conditioning system - Google Patents

Abstract

PURPOSE:To perform energy of the piping design and the piping work of a drain pipe by providing a sensible heat room cooling indoor unit for controlling the cold source temperature of the indoor unit to a dew-point temperature or higher of the indoor air to conduct 1 sensible heat room cooling. CONSTITUTION:A sensible heat room cooling indoor unit 3 is so controlled that cold source temperature to be supplied to an indoor heat exchanger 31 becomes a dew-point temperature or higher of the air of a room 1. In an indoor unit 2, a cold source temperature to be supplied to an indoor heat exchanger 21 is about 0-10 deg.C and lower than the dew-point temperature of the air in the room 1. Accordingly, in the unit 3, it absorbs only sensible heat load in the room 1 and does not generate drain, and hence eliminates a drain pipe for discharging drain out of the room. Thus, the piping work for the drain pipe can be eliminated to conduct energy saving.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning system for cooling an indoor space with a plurality of indoor units, and more particularly to labor saving during installation of the indoor units.

[0002]

2. Description of the Related Art A conventional air conditioner is disclosed in Japanese Patent Laid-Open No. 62-217029.
As described in Japanese Patent Laid-Open No. 63-254334 and Japanese Patent Laid-Open No. 63-254334, the drainage generated in the cooling operation is received by the water receiving section of the indoor unit,
The drain is pumped up by a drain pump and drained to the outside through a drain pipe.

[0003]

[Problems to be Solved by the Invention]

(1) The conventional air conditioner requires a drain pipe for draining the drain out of the room, which requires time and cost for piping design and piping work.

An object of the present invention is to provide an indoor unit without a drain pipe and to save labor in piping design and piping work.

(2) Further, in an indoor unit for sensible cooling by exchanging heat between cold water and room air, it is necessary to change the cold water temperature as the dew point temperature changes. Therefore, it has a large heat capacity and poor responsiveness. Therefore, insufficient capacity and drainage are likely to occur.

Another object of the present invention is to provide a sensible heat cooling indoor unit in which the temperature of the cold heat source can be changed quickly.

(3) Further, since the indoor units for sensible cooling and the other indoor units have different cold heat source temperatures, two systems of cold heat source devices are required, resulting in an increase in cost.

(4) Further, when the indoor unit for sensible cooling and the other indoor units are combined, the temperature of the blown air is different, so that the temperature distribution in the room is likely to occur.

Still another object of the present invention is to provide an air conditioning system that eliminates the temperature distribution in the room that occurs when an indoor unit for sensible cooling and another indoor unit are combined.

(5), (6) When the indoor unit for sensible heat cooling is in a transient state such as start-up, the temperature of the cold heat source temporarily becomes lower than the dew point temperature of the indoor air, and at that time, drainage is generated, and the drainage is indoors. There is a risk of leakage.

Still another object of the present invention is to provide an air conditioning system that suppresses the temporary generation of drainage that occurs during a transition such as the startup of an indoor unit for sensible cooling.

(7) It is another object of the present invention to provide an indoor unit for sensible cooling, in which the drain does not flow out into the room even if the drain is temporarily generated.

[0013]

[Means for Solving the Problems]

(1) In the present invention, at least one indoor unit of a plurality of indoor units installed to cool the room is
The temperature of the cold heat source supplied to the indoor heat exchanger was set to be equal to or higher than the dew point temperature of the indoor air for sensible cooling.

(2) Further, the indoor unit for sensible heat cooling is cooled by using a vapor compression refrigeration cycle using a compressor.

(3) Further, a multi-chamber type air conditioner using a vapor compression refrigeration cycle in which a plurality of indoor units are connected to one outdoor unit is adopted, and an outlet pipe of the indoor unit for sensible cooling is adopted. A diaphragm is provided.

(4) Further, the indoor unit for sensible cooling is arranged below the other indoor units.

(5) Further, the indoor unit for sensible cooling is started later than the other indoor units.

(6) The indoor unit for sensible cooling is provided with a heating means for heating the sucked air.

(7) Further, the indoor unit for sensible heat cooling is provided with a drain receiver, and the drain receiver is provided with a means for evaporating the drain.

[0020]

[Action]

(1) Since the temperature of the cold heat source supplied to the indoor heat exchanger of the indoor unit for sensible cooling is equal to or higher than the dew point temperature of the indoor air, the indoor unit for sensible cooling absorbs only the sensible heat of the indoor air. Since the latent heat of indoor air is not absorbed, drainage does not occur. Therefore, the drain pipe is unnecessary,
Labor saving such as piping work can be achieved. The latent heat of the indoor air is dehumidified by absorbing heat in an indoor unit other than the sensible cooling indoor unit.

(2) By using the vapor compression refrigeration cycle, the cold heat source temperature of the sensible heat cooling indoor unit can be quickly changed by the compressor rotation speed and the expansion valve opening.

(3) Further, by providing a throttle in the outlet pipe of the indoor unit for sensible cooling of the multi-room air conditioner, the evaporation temperature as the cold heat source temperature becomes higher than the evaporation temperatures of other indoor units, Sensible heat cooling becomes possible.

(4) Further, by arranging the indoor unit for sensible heat cooling at a lower position than the other indoor units, the indoor unit for sensible heat cooling having a high blown air temperature is at the lower position and the blown air temperature is higher. The indoor units other than the sensible-heat-cooling indoor unit are located at the upper position, and the indoor temperature becomes uniform.

(5) Further, by starting the operation of the sensible-heat-cooling indoor unit later than the other indoor units, the other indoor units dehumidify the room and lower the dew point temperature of the indoor air. Since the indoor unit for thermal cooling is operated, the generation of drain in the indoor unit for sensible cooling is suppressed.

(6) By providing the indoor unit for sensible heat cooling with heating means for heating the sucked air, the air sucked into the sensible heat cooled indoor unit is heated,
The sensible heat ratio during cooling is increased, and the generation of drain is suppressed.

(7) Further, even if the indoor unit for sensible cooling is provided with a drain receiver and the drain receiver is provided with a means for evaporating the drain, even if drain occurs in the indoor unit for sensible cooling, the drain is The drain is received by the drain receiver, and the drain can be vaporized by the means for vaporizing the drain, so that the drain does not flow out into the room.

[0027]

FIG. 1 shows an embodiment of the present invention. In the room 1, an indoor unit 2 of a dehumidifying air conditioner and an indoor unit 3 of sensible heat cooling that absorbs only sensible heat in the room are arranged. The indoor units 2 and 3 include the indoor heat exchangers 21 and 31.
The indoor unit 2 is provided with a drain receiver 24 below the indoor heat exchanger 21. The drain receiver 24 has a drain pipe 2
One end of the drain pipe 5 is connected, and the other end of the drain pipe 25 is open to the outside of the room. A dew point temperature sensor 9 is provided at the indoor air intake port of the indoor unit 3. A water tank 6 is provided outside the room, and water is contained therein. An evaporator 5 of the refrigerator 4 that cools the water in the water tank 6 is installed in the water tank 6. Also, the water tank 6
A temperature sensor 8 for detecting the water temperature is provided inside. One end of the water tank 6 and the indoor heat exchanger 21 of the indoor unit 2 are connected by a pipe 11 via a pump 7.
The other end of the indoor heat exchanger 21 of the indoor unit 2 and one end of the indoor heat exchanger 31 of the indoor unit 3 are connected by a pipe 11 provided with a temperature sensor 10 for detecting the water temperature in the pipe. Further, the other end of the indoor heat exchanger 31 of the indoor unit 3 and the water tank 6 are connected by a pipe 11. The detection signals of the temperature sensors 8, 9 and 10 are input to the control device 41 of the refrigerator 4, and the pump 7 receives a signal from the control device 41,
The flow rate can be changed.

Next, the operation will be described. The refrigerator 4 controls the evaporator 5 so that the water temperature T1 in the water tank 6 becomes lower than the dew point temperature T2 of the indoor air. The pump 7 sends the water to the indoor heat exchanger 21, and the indoor heat exchanger 21 exchanges heat with the water and the indoor air sent by the fan 22.
At this time, the water temperature rises above T1 and the room air is cooled. Since the water temperature T1 is lower than the dew point temperature T2 of the indoor air, drainage occurs on the surface of the indoor heat exchanger 21,
The drain drops into the drain receiver 24, and the drain pipe 2
5 is discharged to the outside of the room. Here, the indoor heat exchanger 2
The water temperature T3 that leaves 1 and is sent to the indoor heat exchanger 31 is
The flow rate of the pump 7 is controlled by the control device 41 so that the dew point temperature T2 of the room air is equal to or higher than T2. The water sent to the indoor heat exchanger 31 is heat-exchanged with the indoor air sent by the fan 32 in the indoor heat exchanger 31. At this time, the indoor air is cooled, but since the temperature T3 of the water is equal to or higher than the dew point temperature T2 of the indoor air, drainage does not occur.
Therefore, the indoor unit 3 is an indoor unit that performs sensible cooling. The temperature of the water further rises and the indoor heat exchanger 31
Exit and return to the water tank 6.

A second embodiment of the present invention is shown in FIG. In the room 1, an indoor unit 2 of a dehumidifying air conditioner and indoor units 3a and 3b of sensible heat cooling are arranged. The indoor units 2, 3a and 3b are respectively the indoor heat exchanger 2
1, 31a and 31b, indoor fans 22, 32a and 3
2b and the indoor expansion valves 23, 33a and 33b. The indoor unit 2 is provided with a drain receiver 24 below the indoor heat exchanger 21. One end of the drain pipe 25 is connected to the drain receiver 24, and the other end of the drain pipe 25 is open to the outside of the room. Indoor unit 3a
A dew point temperature sensor 9 is provided at the indoor air suction port. Temperature sensors 36a and 36b for detecting the refrigerant temperatures T3a and T3b are provided in the pipes between the indoor heat exchangers 31a and 31b of the indoor units 3a and 3b and the indoor expansion valves 33a and 33b. The indoor unit 2 includes a liquid pipe 107 and a gas pipe in the outdoor unit 100.
Connected by 108 and. In addition, the indoor unit 3
Reference numerals a and 3b denote multi-room air conditioners connected to the outdoor unit 200 by a branched liquid pipe 207 and a gas pipe 208. The outdoor units 100 and 200 are
Compressors 101 and 201, outdoor heat exchanger 102, respectively
And 202, outdoor fans 103 and 203, outdoor expansion valves 104 and 204, and four-way valves 105 and 205. The discharge of the compressors 101 and 201 is a four-way valve
5 and 205 are connected to one ends of the outdoor heat exchangers 102 and 202, the other ends of the outdoor heat exchangers 102 and 202 are connected to one ends of the outdoor expansion valves 104 and 204, and the outdoor expansion valves 104 and 204 are connected to each other. The other end is connected to one ends of the liquid pipes 107 and 207. The other end of the liquid pipe 107 is connected to one end of the indoor expansion valve 23,
The other end of is connected to one end of the indoor heat exchanger 21.
The other end of the indoor heat exchanger 21 is connected to one end of the gas pipe 108, and the other end of the gas pipe is connected to the suction of the compressor 101 via the four-way valve 105. The other end of the liquid pipe 207 is branched and connected to one ends of the indoor expansion valves 33a and 33b, respectively, and the other ends of the indoor expansion valves 33a and 33b are connected to one ends of the indoor heat exchangers 31a and 31b. The other ends of the indoor heat exchangers 31a and 31b are connected to one end of a branched gas pipe 208,
The other ends of the two are joined and connected to the suction of the compressor 201 via a four-way valve. Where the four-way valves 105 and 205
Can be switched so that the discharges of the compressors 101 and 201 are connected to the gas pipes 108 and 208, and the suction of the compressors 101 and 201 is connected to the outdoor heat exchangers 102 and 202. The outdoor unit 200 is provided with a pressure sensor 209 that detects the suction pressure.

Next, the operation will be described. The high-pressure refrigerant gas compressed by the compressors 101 and 201 enters the outdoor heat exchangers 102 and 202 through the four-way valves 105 and 205,
The heat exchange is performed by the outdoor air sent by the outdoor fans 103 and 203, the refrigerant gas is condensed into the liquid refrigerant, passes through the outdoor expansion valves 104 and 204, and is connected to the liquid pipes 107 and 2.
It is sent to 07. The liquid refrigerant that has entered the liquid pipe 107 is sent to the indoor unit 2, decompressed by the indoor expansion valve 23, and enters the indoor heat exchanger 21. The refrigerant entering the indoor heat exchanger 21 is heat-exchanged with the indoor air sent by the indoor fan 22,
The refrigerant evaporates to a low pressure refrigerant gas and the room air is cooled. The temperature of the refrigerant in the indoor heat exchanger 21 is usually 0 to 1
Since it is about 0 ° C. and lower than the dew point temperature T2 of the indoor air, drainage is generated, the drainage is collected in the drain receiver 24, and is discharged to the outside by the drain pipe 25. The low-pressure refrigerant gas leaving the indoor heat exchanger 21 is connected to the gas pipe 108.
Through the four-way valve 105 to be sucked into the compressor. On the other hand, the liquid refrigerant in the liquid pipe 208 is divided into the indoor units 3a and 3 respectively.
b, the pressure is reduced by the indoor expansion valves 33a and 33b, and the indoor heat exchangers 31a and 31b enter. Indoor heat exchanger 31
The refrigerant that has entered a and 31b is the indoor fans 32a and 32b.
Heat is exchanged with the room air sent in b, the refrigerant evaporates to a low-pressure refrigerant gas, and the room air is cooled. At this time,
The dew point temperature T2 of the indoor air is detected by the dew point temperature sensor 9, and the refrigerant temperatures T3a and T3b entering the indoor heat exchangers 32a and 32b are also detected, and the respective signals are input to the control device 206 and the refrigerant is Temperature T3a
And T3b are controlled so that the compressor capacity is higher than the dew point temperature T2 of the indoor air. Therefore, no drain is generated in the indoor units 3a and 3b. Note that the suction pressure of the compressor 201 may be detected by the pressure sensor 209, and the capacity of the compressor may be controlled so that the saturation temperature of the suction pressure becomes higher than the dew point temperature T2 of the room air. In that case, the temperature sensors 36a and 36b are unnecessary,
Cost reduction. The low-pressure refrigerant gases that have exited the indoor heat exchangers 32a and 32b are merged through the gas pipes 208, enter the outdoor unit 200, and pass through the four-way valve,
It is sucked into the compressor 201.

A third embodiment of the present invention is shown in FIG. FIG. 3 is a multi-room air conditioner that connects the dehumidifying indoor unit 2 and the sensible heat cooling indoor unit 3 to the outdoor unit 200. The indoor unit 2 has the same configuration as the indoor unit 2 of FIG. The indoor unit 3 has the same configuration as the indoor units 3a and 3b in FIG. The outdoor unit 200 has the same configuration as the outdoor unit 200 shown in FIG. A temperature sensor 26 for detecting the refrigerant temperature T1 is provided between the indoor expansion valve 23 of the indoor unit 2 and the indoor heat exchanger 21, and a gas pipe side of the indoor heat exchanger 32 of the indoor unit 3 is provided. A diaphragm 37 is provided.

Next, the operation will be described. Outdoor unit 20
The liquid refrigerant sent to the indoor units 2 and 3 from 0 through the liquid pipe 207 is decompressed by the indoor expansion valves 23 and 33, enters the indoor heat exchangers 21 and 31, and the indoor fan 22
And 32, the heat is exchanged with the room air, the refrigerant evaporates into a low-pressure refrigerant gas, and the room air is cooled. Here, since the throttle 37 is provided at the refrigerant outlet of the indoor heat exchanger 31 of the indoor unit 3, the indoor heat exchanger 31
Is higher than the indoor heat exchanger 21 of the indoor unit 2. Therefore, the refrigerant temperature T3 in the indoor heat exchanger 31
Is higher than the refrigerant temperature T1 in the indoor heat exchanger 21. The respective refrigerant temperatures T1 and T3 and the dew point temperature T2 of the indoor air are detected by the temperature sensors 26 and 36 and the dew point temperature sensor 9 and input to the control device 206. The controller 206 controls the capacity of the compressor 201 to cool the room 1 so that each temperature becomes T2 <T3.

A fourth embodiment of the present invention is shown in FIG. Figure 4
3 is a configuration in which the throttle 37 of the indoor unit 3 for sensible heat cooling in FIG. 3 is replaced with a control valve 38 whose valve opening can be adjusted, and other configurations are the same as in FIG.

Next, the operation will be described. In the indoor unit 3, the dew point temperature T2 of the indoor air and the refrigerant temperature T3 are input to the control device 39, and the control device 39 determines that the temperatures are T2 <
The valve opening of the control valve 38 is controlled so as to become T3, and the room 1 is cooled.

A fifth embodiment of the present invention is shown in FIG. The indoor unit 2 is connected to the outdoor unit 100, and the indoor unit 3 is connected to the outdoor unit 200, and each constitutes a vapor compression refrigeration cycle. Indoor unit 2
And 3 have the same construction as the indoor units 2 and 3a, 3b of FIG.
The configuration is the same. In addition, the outdoor units 100 and 2
00 is similar to the outdoor units 100 and 200 of FIG. The indoor unit 3 for sensible cooling is installed below the dehumidifying indoor unit 2.

Next, the operation will be described. In the indoor unit 3, the temperature sensor 36 detects the refrigerant temperature T3 entering the indoor heat exchanger 31, and the dew point temperature sensor 9 detects the dew point temperature T2 of the indoor air.
Input to the control device 206. The control device 206 controls the compressor 20 so that the refrigerant temperature T3 becomes equal to or higher than the dew point temperature T2.
Control the capacity of 1. Since the indoor unit 2 performs cooling with dehumidification, the temperature of the refrigerant entering the indoor heat exchanger is lower than the dew point temperature T2. Therefore, the temperature of the air blown from the indoor unit 2 in the upper position is lower than the temperature of the air blown from the indoor unit 3 in the sensible heat cooling in the lower position, and the temperature distribution in the room 1 is higher than that in the case where the arrangement of the indoor units 2 and 3 is reversed. Is improved.

FIG. 6 of the present invention shows a method of operating the indoor units 2 and 3 of the air conditioning system of FIG.
When the air conditioning operation signal is input, first, the indoor unit 2 is operated, the room is dehumidified, and the dew point temperature of the room air is lowered. After that, the indoor unit 3 is operated after a lapse of Δt time.

FIG. 7 of the present invention shows an embodiment of the sensible heat cooling indoor unit. The indoor heat exchanger 31 and the indoor fan 3 are shown in FIG.
2, the indoor fan motor 32 ', the heater 45, and the controller 44. The piping for supplying the cold heat source to the indoor heat exchanger 31 is not shown.

Next, the operation will be described. When the fan 32 is rotated by the fan motor 32 ', the indoor air passes through the heater 45 and the fan motor 32' and is sent to the indoor heat exchanger 31, where heat is exchanged with the cold heat source, and the indoor air is cooled. Is blown out indoors. Here, the control device 44 turns on the power of the heater 45 to heat the intake air for a predetermined time at the time of startup or when the cold heat source temperature is lower than the dew point temperature of the room air.

FIG. 8 of the present invention shows a second embodiment of the sensible heat cooling indoor unit, which comprises an indoor heat exchanger 31, an indoor fan 32 and an indoor fan motor 32 ', and further, an indoor heat exchanger. A drain receiver 34 is provided below the device 31, and a heat sink 40 is provided on the drain receiver 34.
Further, the heat dissipation plate 40 includes a fan motor 32 'and a heat conduction plate 41
Are joined by.

Next, the operation will be described. In the transient state at the time of starting the operation of the sensible-heat cooling indoor unit 3, the indoor heat exchanger 3
The temperature of the cold heat source in 1 becomes lower than the dew point temperature in the room, drain is temporarily generated, and the drain drops into the drain receiver 34. The drain receiver has a radiator plate 40 heated by the heat of the fan motor 32 ', and the drain is heated by the radiator plate 40 and evaporated.

FIG. 9 of the present invention shows a third embodiment of the sensible heat cooling indoor unit, which comprises an indoor heat exchanger 31, an indoor fan 32 and an indoor fan motor 32 '.
Further, a drain receiver 34 is provided below the indoor heat exchanger 31, a heater 42 and a liquid level sensor 43 for detecting the liquid level of the drain receiver 34 are provided in the drain receiver 34, and the signal of the liquid level sensor 43 is Input to the control device 44, the control device turns on / off the power supply to the heater 42 and the fan motor 32 '.

Next, the operation will be described. In the transient state at the time of starting the operation of the sensible-heat cooling indoor unit 3, the indoor heat exchanger 3
The temperature of the cold heat source in 1 becomes lower than the dew point temperature in the room, drain is temporarily generated, and the drain drops into the drain receiver 34. When the drain collects in the drain receiver 34, the liquid level sensor 4
3 detects this, and the signal is input to the control device 44. At this time, the controller 44 turns on the heater 42 to heat the drain of the drain receiver 34. by this,
The drain evaporates. When the drain evaporates and the liquid level of the drain receiver 34 drops, the liquid level sensor 43 detects it, and the signal is sent to the control device 44, and the control device 44 turns off the power of the heater. Since more drainage is generated than the drainage that evaporates, when the liquid level of the drain receiver 34 further rises, the liquid level sensor 43 before it overflows from the drain receiver.
Also detects that and sends a signal to the controller 44,
The control device 44 stops the supply of the cold heat source and turns off the fan motor 3
2'is stopped, the operation of the indoor unit 3 is forcibly stopped, and an abnormality is displayed or a sound is issued. According to the present invention, even if the heater 42 fails and the drain cannot be evaporated, the drain receiver 34 does not overflow.

FIG. 9 of the present invention shows a third embodiment of the sensible heat cooling indoor unit, which comprises an indoor heat exchanger 31, an indoor fan 32 and an indoor fan motor 32 '.
Further, the drain receiver 34 is provided below the indoor heat exchanger 31, and the drain receiver 34 is provided with a heater 42 and a liquid level sensor 43 for detecting the liquid level of the drain receiver 34. A heater 45 is provided on the air intake side.
Is provided. Further, the signal of the liquid level sensor 43 is input to the control device 44, and the control device turns on / off the power supply to the heaters 42 and 45 and the fan motor 32 '.

Next, the operation will be described. In the transient state at the time of starting the operation of the sensible-heat cooling indoor unit 3, the indoor heat exchanger 3
The temperature of the cold heat source in 1 becomes lower than the dew point temperature in the room, drain is temporarily generated, and the drain drops into the drain receiver 34. When the drain collects in the drain receiver 34, the liquid level sensor 4
3 detects this, and the signal is input to the control device 44. At this time, the controller 44 turns on the heaters 42 and 45 to heat the suction air and the drain of the drain receiver 34. This causes the drain to evaporate. When the drain evaporates and the liquid level of the drain receiver 34 drops, the liquid level sensor 43 detects it, and the signal is sent to the control device 44, and the control device 44 turns off the power sources of the heaters 42 and 45. When the liquid level of the drain receiver 34 further rises because more drain is generated than the evaporated drain,
Before the liquid overflows from the drain receiver, the liquid level sensor 43 also detects it, and the signal is sent to the control device 44, which stops the supply of the cold heat source, stops the fan motor 32 ', and stops the indoor unit 3 The operation of is forcibly stopped and an error is displayed or a sound is issued.

According to this embodiment, the drain is the drain receiver 3
When the water is accumulated in the nozzle 4, the heater 45 is also inserted to heat the sucked air, so that the sensible heat ratio of the air to be heat-exchanged is increased, the generation of drain is reduced, and the drain can be evaporated earlier than the embodiment of FIG. . Further, even if the heater 42 fails and the drain cannot be evaporated, the indoor unit 3 is stopped, so that the drain receiver 34 does not overflow.

[0047]

【The invention's effect】

(1) According to the present invention, since the indoor unit for sensible heat cooling does not generate drain, a drain pipe for discharging the drain to the outside of the room is not required, and labor for piping work can be saved.

(2) Further, by operating the sensible heat cooling indoor unit in the vapor compression refrigeration cycle, the temperature of the cold heat source can be changed quickly, and the lack of capacity and the occurrence of drain can be suppressed.

(3) Since the multi-room air conditioner is provided with the indoor unit for sensible heat cooling and the other indoor units, the number of outdoor units is reduced and the cost is reduced.

(4) By disposing the indoor unit for sensible cooling in a position lower than the other indoor units, the temperature distribution in the room can be eliminated.

(5) Furthermore, by starting the operation of the sensible heat cooling indoor unit later than the other indoor units, it is possible to suppress the occurrence of a temporary drain at the time of startup in the sensible heat cooling indoor unit.

(6) By providing the indoor unit for sensible heat cooling with the heating means for heating the sucked air, the sensible heat ratio at the time of cooling can be increased and the generation of drain can be suppressed.

(7) Further, by providing a drain receiver in the indoor unit for sensible heat cooling and providing a means for evaporating the drain in the drain receiver, even if the drain is generated, the drain is caused to flow out of the room to cause a water leak accident. Does not cause

[Brief description of drawings]

FIG. 1 is a system diagram of an air conditioning system showing an embodiment of the present invention.

FIG. 2 is a system diagram of an air conditioning system showing a second embodiment of the present invention.

FIG. 3 is a system diagram of an air conditioning system showing a third embodiment of the present invention.

FIG. 4 is a system diagram of an air conditioning system showing a fourth embodiment of the present invention.

FIG. 5 is a system diagram of an air conditioning system showing a fifth embodiment of the present invention.

FIG. 6 is a time chart showing the operation sequence of the air conditioning system of the present invention.

FIG. 7 is an explanatory view showing an embodiment of the sensible heat cooling indoor unit of the present invention.

FIG. 8 is an explanatory view showing a second embodiment of the sensible heat cooling indoor unit of the present invention.

FIG. 9 is an explanatory view showing a third embodiment of the sensible heat cooling indoor unit of the present invention.

FIG. 10 is an explanatory view showing a fourth embodiment of the sensible heat cooling indoor unit of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Indoor, 2 ... Indoor unit, 3 ... Sensible heat cooling indoor unit, 21, 31 ... Indoor heat exchanger, 22, 32 ... Indoor fan, 23, 33 ... Indoor expansion valve, 24 ... Drain receiver, 25
... Drain pipe, 26, 36 ... Temperature sensor, 37 ... Throttle, 200 ... Outdoor unit, 201 ... Compressor, 202 ...
Outdoor heat exchanger, 203 ... Outdoor fan, 204 ... Outdoor expansion valve, 205 ... Four-way valve, 206 ... Control device, 207 ... Liquid piping, 208 ... Gas piping.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kuhei Ishibane 502 Jinritsucho, Tsuchiura-shi, Ibaraki Machinery Research Institute, Hiritsu Manufacturing Co., Ltd. Inside the factory (72) Inventor Osamu Seki 390 Muramatsu, Shimizu City, Shizuoka Prefecture Inside the Shimizu Factory, Hitachi, Ltd.

Claims (1)

[Claims] 1. An air conditioning system in which a plurality of indoor units are arranged, and an indoor fan and an indoor heat exchanger provided in the indoor unit exchange heat between a cold heat source and indoor air to cool the room. An air conditioning system comprising at least one sensible-heat cooling indoor unit for controlling sensible-heat cooling by controlling a cold heat source temperature of an indoor unit to a dew point temperature of indoor air or higher.