JP2020115058A - Air conditioner unit and air conditioning system - Google Patents

Abstract

To provide an air conditioning system in which energy efficiency of a heat exchange system including a heat exchanger is high, and that prevents temperature irregularity from occurring in air blowing down from a ceiling discharge port.SOLUTION: A heat exchange air passage 5 and a bypass air passage 6 allowing communication between a suction port 3 and a discharge port 4 are formed in parallel in a casing 2. A mixing chamber 7 into which the heat exchange air passage 5 and the bypass air passage 6 merge is provided on the side of the discharge port 4. A heat exchanger 8 and a heat exchange fan 9 are arranged in the heat exchange air passage 5. A mixing fan 10 is arranged in the mixing chamber 7. A flow rate of the heat exchange air passage 5 and a flow rate of the bypass air passage 6 can be independently controlled. An air flow rate of the heat exchange air passage 5 can be controlled so as to optimize energy efficiency of a whole heat exchange system including the heat exchanger 8 while controlling a total air flow rate.SELECTED DRAWING: Figure 1

Description

The present invention relates to an air conditioner unit used for air conditioning in a room such as a medical room or a clean room in a hospital.

For air conditioning in hospital rooms, medical rooms such as operating rooms, and clean rooms, the room air is sucked in from the suction duct provided near the floor of the room, the temperature and humidity are adjusted, and then dust is removed. In many cases, a circulating air conditioner is used in which the air is circulated from a blowout duct provided on the ceiling into the room. As air conditioning by such circulation type air conditioning, those described in Patent Documents 1-7 are known.

In Patent Document 1, an air inlet (3) is provided on the lower side wall of the operating room (1), an air outlet (4) is provided on the ceiling, and air blown from the air inlet is operated by operating a blower (6). An air circulation path (5) for blowing out from the air outlet into the operating room (1) is formed, and a heat exchanger (8) for cooling or heating air is provided in the air circulation path, bypassing the heat exchanger. A bypass passage (13) for circulating air is provided, and an air flow rate adjustment damper (14) is provided in the bypass passage (13) so that the air passing through the bypass passage (13) and the air passing through the heat exchanger (8) have a predetermined ratio. There is described an air conditioner for an operating room, which is mixed in the above and blown out into the operating room (1) (see FIG. 1, reference [0012][0015]-[0020] in the specification).

Patent Document 2 discloses a cold water coil (4) equipped with a cold water control valve to which cold water for cooling/dehumidification is supplied from a cold heat source device, and hot water to which hot water for heating/reheating is supplied from a hot heat source device. A hot water coil (6) having a control valve is provided, and the cold water coil (4) is constituted by two cold water coil units (4a) each of which can independently control the water amount by the cold water control valve. 6) installed in parallel in the previous stage, and the cold water coil (4), the hot water coil (6), the humidifier (15), and the blower (14) are installed in this order in series in the casing (11) from the upstream side to the downstream side. , A temperature/humidity sensor (20) is installed in the casing (11) in the vicinity of the suction port (12), and the air conditioner (2) is placed in a position facing the operating room (1) to return air (RA). ), the prepared air supply (SA) is blown out to the operating room (1), and the outside air (OA) is processed by the air conditioner (25) to be blown out to the operating room. See FIG. 1, specification [0021]-[0022]).

Further, in Patent Document 3-8, indoor air is sucked from a suction duct provided near the floor surface of an operating room to adjust the temperature, dust is removed, and the air is circulated from a blowout duct provided on the ceiling into the room. Which is a circulating air conditioning system, which comprises a hot water coil or a cold water coil, and an air conditioner unit having a blower inside a casing.

JP, 2014-0887384, A JP, 2014-122740, A JP, 2017-093608, A JP, 2013-148241, A JP, 2005-080590, A JP, 2005-081720, A JP, 2015-100554, A JP, 2008-057929, A

In medical rooms and clean rooms in hospitals, air whose temperature is adjusted (temperature-controlled air) is blown down from the ceiling outlet provided on the ceiling, and indoor air is recirculated or exhausted from the floor surface or near the floor surface. Thus, the temperature inside the room is adjusted to a predetermined temperature and the airflow (laminar flow) from the ceiling to the floor is maintained as much as possible to maintain the cleanliness of the room. At this time, in order to maintain the cleanliness, the optimum flow rate of the airflow blown down from the ceiling to the floor surface is determined. Therefore, the flow rate of the air conditioner in air conditioning is determined by the optimum flow rate for maintaining the cleanliness. On the other hand, the temperature of the air output from the air conditioner is determined by the temperature of the heat medium flowing through the heat exchanger (hot water coil or cold water coil) and the flow rate of air passing through the heat exchanger.

In the air conditioner described in Patent Document 1, a bypass passage (13) is provided in parallel with the heat exchanger (8) for temperature adjustment, and the downstream side of the parallel circuit of the heat exchanger (8) and the bypass passage (13). An air blower (6) is provided in the air passage, and air is circulated in a parallel circuit of the heat exchanger (8) and the bypass passage (13) by the blower (6), and an air volume adjustment damper (14) provided in the bypass passage (13) is provided. ) Is mixed with air at a predetermined ratio and blown out into the operating room (1) (see FIG. 1 of the literature). In this case, if the air flow rate adjustment damper (14) is opened widely to secure the optimum flow rate for maintaining the cleanliness, the flow passage resistance of the bypass passage (13) is greatly reduced, so that the air flowing through the bypass passage (13) is reduced. As the flow rate increases, the flow rate of air flowing through the heat exchanger (8) greatly decreases. Therefore, in order to adjust the temperature-controlled air to the required temperature, the temperature of the heat medium to be flown to the heat exchanger (hot water coil or cold water coil) is reduced by the amount of decrease in the flow rate of the air flowing through the heat exchanger (8). Since it is necessary to shake the temperature excessively high or low, there is a problem that the temperature controllability and the followability are deteriorated, the heat loss of the heat exchange system including the heat exchanger is increased, and the energy efficiency of the entire heat exchange system is also decreased. ..

In the air conditioning system of Patent Document 2-8, the bypass flow path is not provided in the air conditioner, and all the indoor air that has been circulated is allowed to pass through the heat exchanger provided in the air conditioner, with respect to the optimum flow rate for maintaining cleanliness. For the flow rate which is insufficient with the air conditioning function, indoor air (compensation air for flow rate) taken in from outside air or the upper suction port of the ceiling is mixed before the ceiling outlet and blown out into the room. However, in the actual case, the temperature difference between the temperature-controlled air that passes through the air conditioner and the flow-compensation air that is taken in from the upper suction port generally becomes large, and even if both flow together before the upper suction port, they do not mix sufficiently. There are many cases in which the temperature is not controlled (because it is difficult to mix air with greatly different temperatures), there is a problem that temperature unevenness easily occurs in the air blown down into the room from the ceiling outlet.

Therefore, an object of the present invention is to provide high energy efficiency of a heat exchange system including a heat exchanger in an indoor air conditioner such as a medical room or a clean room, and to prevent temperature unevenness in air blown down into the room from a ceiling outlet. It is to provide an air conditioner unit and an air conditioning system capable of achieving the above.

A first configuration of an air conditioner unit according to the present invention is a casing having a suction port on a side surface on one end side and a blowout port on the other end side,
A heat exchange air passage formed in the casing, which communicates the suction port and the air outlet,
A bypass air passage formed in parallel with the heat exchange air passage in the casing, which connects the suction port and the air outlet,
A mixing chamber in which the heat exchange air passage and the bypass air passage merge on the outlet side,
A heat exchanger arranged in the heat exchange ventilation passage or at the inlet thereof,
A heat exchange fan that is arranged in the heat exchange air passage and that sends air from the suction port side to the air outlet side under pressure,
And a mixing fan that is arranged in the mixing chamber and mix-feeds air to the outlet side.

According to this configuration, the flow rate of the air whose temperature is adjusted by the heat exchanger that flows through the heat exchange ventilation passage is adjusted by the heat exchange fan, and the air conditioner that flows through the heat exchange ventilation passage and the bypass ventilation passage. The total flow rate of air discharged from the unit is adjusted by the mixing fan. Therefore, since the air flow rate flowing through the heat exchange air passage and the air flow rate passing through the bypass air passage can be independently controlled, the total air flow rate discharged from the air conditioner unit is controlled by the mixing fan. At the same time, the heat exchange fan can control the air flow rate in the heat exchange ventilation passage so that the energy efficiency of the entire heat exchange system including the heat exchanger is optimized. Further, the temperature-controlled air in the heat exchange ventilation passage and the non-temperature-controlled air that has passed through the bypass ventilation passage are completely mixed by passing through the mixing fan. Therefore, it is possible to prevent temperature unevenness from occurring in the air discharged from the air conditioner unit.

A second configuration of the air conditioner unit according to the present invention is the air conditioner unit according to the first configuration, further including an electric auxiliary heater provided on the outlet side of the heat exchanger in the heat exchange ventilation passage or in the mixing chamber. It is characterized by having.

According to this configuration, when the heating by the heat exchanger of the heat exchange ventilation passage is insufficient for the required amount of heat, the electric auxiliary heater supplements the insufficient amount of heat to increase the air flow rate discharged from the air conditioner unit. Even in this case, the temperature of the air discharged from the air conditioner unit can be adjusted to the required temperature.

A third configuration of the air conditioner unit according to the present invention is characterized in that, in the first or second configuration, a sterilizing lamp provided in the vicinity of the heat exchanger is provided.

According to this configuration, since the heat exchanger is sterilized by the sterilizing lamp provided in the vicinity thereof, it is possible to prevent mold from being generated in the heat exchange ventilation passage around the heat exchanger.

The air conditioning system according to the present invention, a lower return port formed in the wall surface near the floor of the room,
An upper return port formed on the wall surface near the ceiling surface of the room or on the ceiling surface near the wall surface of the room,
An air supply port formed on the ceiling surface of the room,
An air conditioner unit of any one of the first to third configurations installed outside the wall of the chamber so that the suction port faces the lower return air port;
An upper return air pipe communicating the upper return air port and the suction port side of the mixing fan of the mixing chamber of the air conditioner unit,
An air supply pipe that connects the air outlet and the air supply port of the air conditioner unit is provided.

According to this configuration, the room air sucked from the lower return port passes through the parallel circuit of the heat exchange ventilation passage and the bypass ventilation passage and flows into the mixing fan. Further, the room air in the vicinity of the wall surface of the ceiling surface of the room, which is sucked in through the upper return air port, passes through the upper return air pipe and flows into the mixing fan. Then, the air is completely mixed by the mixing fan and then discharged into the room from the air supply port. In the vicinity of the wall surface of the ceiling surface of the room, it is easy for the room to form a vortex, and this vortex easily causes dust in the room to stay in the air. Therefore, in this way, by sucking the indoor air near the wall surface of the ceiling surface of the room from the upper return port to the mixing fan, it is possible to make it difficult for dust to remain in the air near the wall surface of the room ceiling surface. The air cleanliness of can be improved. Further, the air sucked from the upper return port is completely mixed by the mixing fan, and is circulated from the air supply port into the room, whereby the temperature unevenness blown down from the air supply port into the room can be eliminated.

As described above, according to the present invention, since the air flow rate flowing through the heat exchange ventilation passage and the air flow rate flowing through the bypass ventilation passage can be independently controlled, the mixing fan discharges the air from the air conditioning unit. It is possible to control the air flow rate in the heat exchange ventilation passage by the heat exchange fan so that the energy efficiency of the entire heat exchange system including the heat exchanger is optimized while controlling the overall air flow rate. Further, the temperature-controlled air in the heat exchange ventilation passage and the non-temperature-controlled air that has passed through the bypass ventilation passage are completely mixed by passing through the mixing fan. Therefore, it is possible to prevent temperature unevenness from occurring in the air discharged from the air conditioner unit.

In addition, since the sterilizing lamp is provided near the heat exchanger, the heat exchanger is sterilized by the sterilizing lamp, and thus mold is prevented from being generated in the heat exchange ventilation passage around the heat exchanger. As a result, it is possible to prevent clogging and deterioration of the function of the filter provided downstream of the heat exchanger, and to keep the indoor air cleanliness higher.

It is a figure showing the structure of the air conditioning unit which concerns on Example 1 of this invention. (A) Front view, (b) plan view, (c) AA line arrow view of the state which removed the front panel 2a of the casing 2, (d) BB line sectional view. It is a figure showing the air conditioning system which installed the air conditioner unit 1 of FIG. 1 in room 20, such as an operating room and a clean room. (A) When the upper return air port 22 is formed on the ceiling surface near the wall surface of the chamber 20, and (b) When the upper return air port 22 is formed on the wall surface near the ceiling surface of the chamber 20. It is a schematic cross section showing the structure of the air conditioner unit concerning Example 2 of this invention.

Hereinafter, modes for carrying out the present invention will be described with reference to the drawings.

1 is a diagram showing a configuration of an air conditioner unit according to a first embodiment of the present invention. 1(a) is a front view, FIG. 1(b) is a plan view, FIG. 1(c) is a view taken along the line AA of the casing 2 with the front panel 2a removed, and FIG. 1(d) is B. Each of the -B line arrow sectional views is shown. Further, the semitransparent arrow in FIG. 1C indicates the direction in which air flows for reference.

The air conditioner unit 1 according to the present embodiment includes a casing 2, a suction port 3, a blowout port 4, a heat exchange air passage 5, a bypass air passage 6, a mixing chamber 7, a heat exchanger 8, and a drain pan 8a. , A drain pipe 8b, a heat exchange fan 9, a mixing fan 10, an electric auxiliary heater 11, and an electrical equipment box 12.

The casing 2 is a vertically long and flat, substantially rectangular parallelepiped hollow case, and is a housing installed on the floor surface behind the wall of a room such as an operating room or a clean room. The front surface of the casing 2 is composed of a removable front panel 2a. The suction port 3 is a slit-shaped opening formed on the lower end side of the front side surface of the casing 2. A slit-shaped inlet grill 3a is attached to the front surface of the inlet 3, and a pre-filter 3b for collecting dust is provided in the middle of the inlet 3. When the air conditioner unit 1 is installed, it is installed so that the suction port 3 faces the room through an opening near the floor surface of the wall of the room. The air outlet 4 is an opening formed in the upper end surface of the casing 2. The heat exchange ventilation passage 5 is a ventilation passage that is formed in the casing 2 and connects the suction port 3 and the air outlet 4, and is provided in a portion from the lower end portion to the upper portion in the casing 2. The bypass ventilation passage 6 is a ventilation passage that is formed in the casing 2 in parallel with the heat exchange ventilation passage 5 and that connects the suction port 3 and the air outlet 4. The mixing chamber 7 is an air chamber where the heat exchange ventilation passage 5 and the bypass ventilation passage 6 join together on the blower outlet 4 side in the casing 2, and is provided in the upper portion of the casing 2. The heat exchanger 8 is arranged at the entrance of the heat exchange air passage 5, and circulates a heat medium or a refrigerant whose temperature has been adjusted to exchange heat with the air flowing through the heat exchange air passage 5. This is the module to do. The heat exchanger 8 may be installed inside the heat exchange air passage 5. The heat exchange fan 9 is a blower provided above the heat exchanger 8 in the heat exchange air passage 5. The heat exchange fan 9 pumps the air in the heat exchange ventilation passage 5 from the suction port 3 side to the blowout port 4 side. The mixing fan 10 is a blower arranged in the mixing chamber 7. Air flowing into the mixing chamber 7 from the heat exchange air passage 5 and the bypass air passage 6 is mixed and pressure-fed to the outlet 4 side. The electric auxiliary heater 11 is an electric heater provided in the mixing chamber 7. The electric auxiliary heater 11 may be provided on the blower outlet 7 side (downstream side) of the heat exchanger 8 in the heat exchange ventilation passage 5. The electrical equipment box 12 is a box-shaped chamber provided in the casing 2 in which a control circuit for controlling the heat exchanger 8, the heat exchange fan 9, the mixing fan 10, and the electric auxiliary heater 11 are housed. ..

FIG. 2 is a diagram showing an air conditioning system in which the air conditioner unit 1 of FIG. 1 is installed in a room 20 such as an operating room or a clean room. 2A shows the case where the upper return air port 22 is formed on the wall surface near the wall of the chamber 20, and FIG. 2B shows the case where the upper return air port 22 is formed on the wall surface near the ceiling of the chamber 20. Each one is represented. In FIG. 2, components corresponding to those in FIG. 1 are designated by the same reference numerals. In FIG. 2, only one air conditioner unit 1 is shown as a representative, but in reality, a plurality of air conditioner units 1 are installed in one room 20, and the mixing chamber 27a and the HEPA filter are installed. It can be configured to be connected to the ceiling blowing unit 27 composed of 27B. 2, the air conditioning system includes an air conditioner unit 1, a lower return air port 21, an upper return air port 22, an air supply port 23, an upper return air pipe 24, an outside air introduction pipe 25, an air supply pipe 26, a mixing chamber 27a, and a HEPA. The filter 27B is provided. Although only one air conditioner unit 1 is shown as a representative in FIG. 2, a plurality of air conditioner units 1 are actually installed in each place of the room 20, and the air conditioner units 1 extending from each air conditioner unit 1 are actually provided. The trachea 26 is connected to the mixing chamber 27a.

The lower return air port 21 is an opening for introducing the return air RA formed in the wall surface near the floor surface of the room. The air conditioner unit 1 is the air conditioner unit of FIG. 1, and is installed outside the wall of the chamber 20 so that the lower return air port 21 faces the suction port 3. The upper return air port 22 is an opening for introducing the return air RA formed on the wall surface near the ceiling surface of the room or on the ceiling surface near the wall surface. The air supply port 23 is an opening for discharging the air supply SA formed on the ceiling surface of the room into the room 20. The upper return air pipe 24 is a flow path that connects the upper return air port 22 and the suction port side of the mixing fan 10 of the mixing chamber 7 of the air conditioner unit 1. The outside air introduction pipe 25 is a flow path whose downstream side communicates with the suction port side of the mixing fan 10 of the mixing chamber 7, and outside air OA is introduced from the upstream side. The air supply pipe 26 is a flow path that connects the air outlet 4 of the air conditioner unit 1 and the air supply port 23. The mixing chamber 27a is a chamber for mixing the temperature-controlled air that is pressure-fed from the plurality of air conditioner units 1 before being blown into the chamber 20 from the air supply port 23. The HEPA filter 27B (High Efficiency Particle Air fliter) is a dust removing filter provided between the mixing chamber 27a and the air supply port 23.

The operation of the air conditioner unit 1 and the air conditioning system of this embodiment configured as described above will be described below. When the air conditioner unit 1 is used, the heat exchange fan 9 and the mixing fan 10 are activated. At this time, the output flow rate of the mixing fan 10 is set to an optimum flow rate of the airflow blown down from the ceiling to the floor surface. When a plurality of air conditioner units 1 are installed in one room, the total air flow rate supplied from each air conditioner unit 1 to the air supply port 23 is equal to the air flow blown down from the ceiling to the floor surface. The output flow rate of the mixing fan 10 of each air conditioner unit 1 is set so that the optimal flow rate is obtained. Further, the output flow rate of the heat exchange fan 9 is set to an optimum flow rate such that the energy efficiency of the heat exchange system including the heat exchanger 8 is as high as possible with respect to the set temperature. At this time, the output flow rate of the heat exchange fan 9 is always set to be smaller than the output flow rate of the mixing fan 10. This is because when the output flow rate of the heat exchange fan 9 is larger, the air flows backward from the bypass ventilation passage 6 and the upper return pipe 24.

The room air sucked from the lower return port 21 to the suction port 3 of the air conditioner unit 1 is divided into the heat exchange ventilation passage 5 and the bypass ventilation passage 6, and is rejoined at the suction side of the mixing fan 10 in the mixing chamber 7. To do. The air passing through the heat exchange ventilation passage 5 is heat-exchanged by the heat exchanger 8 and is supplied with heat by the electric auxiliary heater 11 as needed, whereby the temperature is adjusted to the installed temperature. On the other hand, by driving the mixing fan 10, the room air near the wall surface of the ceiling surface of the room is sucked into the mixing fan 10 from the upper return port 22. At this time, dust floating in the air near the wall surface of the ceiling surface of the room is also sucked together with the room air. In addition, when the outside air needs to be introduced, the outside air is supplied to the suction side of the mixing fan 10 through the outside air introduction pipe 25.

The air flowing into the mixing chamber 7 from each of the heat exchange ventilation passage 5, the bypass ventilation passage 6, the upper return pipe 24, and the outside air introduction pipe 25 is completely mixed by the mixing fan 10 and then blown into the mixing chamber 27a. It In the mixing chamber 27a, the air blown from each air conditioner unit 1 is further mixed. Then, the air that has flowed into the mixing chamber 27a and is mixed is dedusted by the HEPA filter 27B, and then discharged from the air supply port 23 into the room.

As described above, according to the present embodiment, the heat exchange fan 9 and the mixing fan 10 allow the air flow rate controlled by the heat exchanger 8 and the bypass ventilation passage 6, the upper return air pipe 24, and the outside air introduction pipe 25 to Since the flow rate can be controlled independently of the air flow rate for adjusting the introduced air volume, the heat exchange fan 9 can exchange heat while controlling the total air flow rate discharged from the air conditioner unit 1 by the mixing fan 10. Ventilation passage 5 for heat exchange so that the energy efficiency of the entire heat exchange system including the heat exchanger 8 (the entire heat exchanger 8 and the heating/cooling system for the heat medium or refrigerant flowing through the heat exchanger 8) is optimized. The air flow rate can be controlled. Further, the temperature-controlled air flowing through the heat exchange ventilation passage 5 and the non-temperature-controlled air that has passed through the bypass ventilation passage 6, the upper return air pipe 24, and the outside air introduction pipe 25 should pass through the mixing fan 10. As a result, the air discharged from the air conditioner unit 1 can be prevented from being uneven in temperature because it is completely mixed.

FIG. 3 is a schematic cross-sectional view showing the configuration of the air conditioner unit according to the second embodiment of the present invention. The sectional view of FIG. 3 corresponds to the sectional view of FIG. In FIG. 3, components corresponding to those in FIG. 1 of the first embodiment are designated by the same reference numerals, and description thereof will be omitted. Compared to the first embodiment, the present embodiment is different from the first embodiment in that sterilization lamps 13 and 13 are newly provided. The sterilization lamp 13 is a UV irradiator that irradiates ultraviolet rays for sterilization. The heat exchanger 8 is provided at a position near the heat exchanger 8 where light rays are irradiated. In the present embodiment, one is provided on the suction port 3 side (upstream side) of the heat exchanger 8 and the heat exchanger 8 is provided. 8 is provided on the heat exchange ventilation passage 5 side (downstream side). As the "UV irradiator", an ultraviolet lamp or a high-power ultraviolet LED is used, but it is preferable to use a high-power ultraviolet LED from the viewpoint of less heat generation, longer life, and lower power consumption. Turning on/off of the germicidal lamp 13 is controlled by a control circuit in the electrical equipment box 12, and is controlled so as to irradiate continuously or intermittently while the air conditioner unit 1 is being activated.

When the air conditioner unit 1 is operated in the cooling operation, moisture in the air is condensed around the heat exchanger 8 to cause dew condensation. Due to this dew condensation, the area around the heat exchanger 8 is in an environment where mold is likely to occur. In this embodiment, a sterilizing lamp 13 is provided in the vicinity of the heat exchanger 8 and the periphery of the heat exchanger 8 is continuously or intermittently irradiated with a sterilizing light beam to sterilize the periphery of the heat exchanger 8 and mold. By preventing the generation, it is possible to prevent the HEPA filter 28 from being clogged or having its function deteriorated, and to keep the indoor air cleanliness higher.

1 Air Conditioner Unit 2 Casing 2a Front Panel 3 Suction Port 3a Suction Port Grill 3b Pre-filter 4 Outlet 5 Heat Exchange Vent 6 Bypass Vent 7 Mixing Chamber 8 Heat Exchanger 8a Drain Pan 8b Drain Piping 9 Heat Exchange Fan 10 Mixing fan 11 Electric auxiliary heater 12 Electrical equipment box 13 Sterilization lamp 20 Room 21 Lower return air port 22 Upper return air port 23 Air supply port 24 Upper return air pipe 25 Outside air introduction pipe 26 Air supply pipe 27 Ceiling blowout unit 27a Mixing chamber 27b HEPA filter

Claims (4)

A casing having a suction port on the side surface on one end side and a blowout port on the other end side,
A heat exchange air passage formed in the casing, which communicates the suction port and the air outlet,
A bypass air passage formed in parallel with the heat exchange air passage in the casing, which connects the suction port and the air outlet,
A mixing chamber in which the heat exchange air passage and the bypass air passage merge on the outlet side in the casing,
A heat exchanger arranged in the heat exchange ventilation passage or at the inlet thereof,
A heat exchange fan that is arranged in the heat exchange air passage and that sends air from the suction port side to the air outlet side under pressure,
An air conditioner unit, comprising: a mixing fan, which is arranged in the mixing chamber and mix-feeds air to the outlet side. The air conditioner unit according to claim 1, further comprising an electric auxiliary heater provided on the outlet side of the heat exchanger or in the mixing chamber. The air conditioner unit according to claim 1 or 2, further comprising: a sterilizing lamp provided in the vicinity of the heat exchanger in the heat exchange ventilation passage. A lower return port formed on the wall near the floor of the room,
An upper return port formed on the wall surface close to the ceiling surface of the room or on the ceiling surface close to the wall surface of the room,
An air supply port formed on the ceiling surface of the room,
The air conditioner unit according to any one of claims 1 to 3, wherein the air conditioner unit is installed outside a wall of a chamber so that the suction port faces the lower return port.
An upper return air pipe communicating the upper return air port and the suction port side of the mixing fan of the mixing chamber of the air conditioner unit,
An air conditioning system, comprising: an air supply pipe that connects the air outlet of the air conditioner unit to the air supply port.