Outdoor air treatment machine

Abstract

To provide an outside air treatment machine that is improved in energy consumption efficiency through heat recovery from return air although having simple constitution.SOLUTION: An outside air treatment machine 1 which supplies air, obtained by treating the outside air to adjust its temperature and humidity, into an object chamber R comprises: a heat pump circuit 20 in which a first heat exchanger 21, a second heat exchanger 22, a third heat exchanger 23, and a compressor 26 are connected by refrigerant piping 25; an exhaust blowing part 11 in which the first heat exchanger 21 and second heat exchanger 22 are arranged and which has an exhaust fan 31 exhausting air having passed through the first heat exchanger 21 and second heat exchanger 22; an air blowing part 12 in which the third heat exchanger 23 is arranged and which has an air feed fan 32 feeding air having passed through the third heat exchanger to an object space; and an air mixing part 13 which is connected to the exhaust blowing part 11, and also provided with an outside air intake 36 for taking in outside air OA and a return air intake 37 for taking in return air RA from the inside of the chamber.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an outside air treatment device for ventilating a room, which is used in conjunction with an air conditioner. [Background technology]

[0002] Traditionally, in air conditioning to maintain the quality of products in large facilities such as hospitals, elderly care facilities, and large buildings, as well as in production processes in factories, if the amount of air exhausted from inside the room for ventilation is greater than the amount of air supplied from outside, the room will become negative pressure and dirty air will enter through gaps, which can cause the indoor air environment to deteriorate. For this reason, in large facilities that require a large amount of ventilation and exhaust, in order to adjust the amount of air supplied to the room and the amount of air exhausted from the room to maintain positive or negative pressure in the room depending on the purpose of the facility, outside air processing machines that process fresh outside air and supply it to the room are used in addition to air conditioners that adjust the temperature and humidity inside the room.

[0003] For example, the outdoor air treatment machine has the role of supplying air at a lower temperature than the outdoor air into the room in summer, and air at a higher temperature than the outdoor air into the room in winter, thereby eliminating the difference in temperature with the conditioned room, and preventing the area around the indoor air intake from becoming uncomfortable, and also has the function of not placing an unnecessary burden on the air conditioner. In recent years, outdoor air treatment machines that use heat pump technology to obtain greater thermal energy than electrical energy have been provided in order to save energy.

[0004] One such outdoor air processing machine (outdoor air processing air conditioner) disclosed is an air-cooled heat pump type outdoor air processing air conditioner that includes, within a casing, an intake air blowing duct in which first and second evaporators and an intake fan that supplies conditioned air to the conditioned space are provided, and an outdoor air blowing duct in which at least a pair of condensers are provided with their air outlets facing each other, separated by an exhaust fan (see, for example, Patent Document 1).

[0005] In the above-mentioned outdoor air processing device, the condenser and the evaporator are constituted by a heat exchanger having a heat transfer tube through which a refrigerant flows, and during winter operation, the heat exchanger provided in the exhaust air duct (outdoor air duct) functions as an evaporator, and the heat exchanger provided in the intake air duct functions as a condenser. Also, during summer operation, the heat exchanger provided in the exhaust air duct functions as a condenser, and the heat exchanger provided in the intake air duct functions as an evaporator. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 4016346 Summary of the Invention [Problem to be solved by the invention]

[0007] However, the outdoor air processing machine of Patent Document 1 is configured to pass only outdoor air through a heat exchanger installed in the exhaust air duct, and does not recover heat by taking in return air from inside the room. Therefore, when the difference between the outdoor air temperature and the room temperature is large, the operating load increases. In addition, outdoor air processing machines such as those of Patent Document 1 are often used for outdoor air processing in facilities with a small return air volume, and if the air introduced into the exhaust air duct is simply replaced with return air from inside the room, for example, there is a problem that the heat recovery by the heat pump does not work as a refrigeration cycle due to insufficient air volume. In other words, the performance of the outdoor air processing machine that ventilates the room while maintaining the indoor pressure at a specified state may be lost.

[0008] The present invention has been made to solve the above-mentioned problems, and aims to provide an outdoor air treatment machine that has a simple configuration yet improves energy consumption efficiency by recovering heat from return air. [Means for solving the problem]

[0009] The present invention is an outdoor air treatment machine that processes outdoor air and supplies air with adjusted temperature and humidity into a target space, comprising a heat pump circuit in which a first heat exchanger, a second heat exchanger, a third heat exchanger, and a compressor are connected by refrigerant piping, an exhaust blower section in which the first heat exchanger and the second heat exchanger are arranged and has an exhaust fan that exhausts air that has passed through each of the first and second heat exchangers, and an air supply blower section in which the third heat exchanger is arranged and has a supply fan that supplies air that has passed through the third heat exchanger to the target space, and further comprising an air mixing section connected to the exhaust blower section and provided with an outdoor air intake port for taking in outdoor air and a return air intake port for taking in return air from inside the room.

[0010] In addition, in the outdoor air treatment machine of one embodiment of the present invention, the air mixing section is provided adjacent to the opposite surfaces of the first heat exchanger and the second heat exchanger, which are arranged opposite each other and spaced apart in the exhaust blower section.

[0011] In addition, the outdoor air treatment machine according to one embodiment of the present invention is provided with a return air duct having one end connected to a return air exhaust port of the target space and the other end connected to the return air intake port, and a return air fan is arranged in the return air duct. Effect of the Invention

[0012] The outdoor air treatment machine of the present invention is configured to have an air mixing section to naturally mix outdoor air with return air with a low air conditioning load, and the mixed air of the return air and outdoor air passes through a heat exchanger arranged in the exhaust air blowing section, thereby improving the COP (Coefficient of Performance) of the heat pump that recovers heat. That is, in summer, the condensation temperature by the heat exchanger arranged in the exhaust air blowing section can be lowered by taking in cold return air, and in winter, the evaporation temperature by the heat exchanger arranged in the exhaust air blowing section can be raised by taking in warm return air, thereby improving the cooling COP and heating COP. Therefore, it is possible to provide an outdoor air treatment machine that is energy efficient and can supply outdoor air with a stable temperature and humidity to the room throughout the year.

[0013] The outdoor air treatment machine of the present invention can suppress defrosting of the heat exchanger of the outdoor air treatment machine, particularly in winter, by mixing the return air with the outdoor air passed through the heat exchanger arranged in the exhaust air blowing section. Since it is possible to suppress frost formation on the evaporator in the outdoor air treatment machine, it is possible to improve the deterioration of performance due to defrosting and discomfort such as the feeling of cold air inside the room. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a perspective view of an outdoor air processing device according to an embodiment of the present invention. [Diagram 2] 1 is a schematic diagram showing a configuration of an outside air processing unit according to an embodiment of the present invention and a state in which the outside air processing unit is connected to a target room. FIG. [Diagram 3] FIG. 2 is a diagram illustrating the refrigeration cycle of a heat pump during cooling operation in summer in an outdoor air processing unit according to one embodiment of the present invention. [Figure 4] 10 is a diagram illustrating the results of a simulation of changes in power consumption and compressor COP for each return air recovery ratio during rated operation of an outdoor air treatment device according to one embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The present invention relates to an outdoor air treatment machine that supplies outdoor air with adjusted temperature and humidity to a room, and is characterized by having a heat pump circuit and a configuration in which return air from the room and outdoor air are mixed and supplied to a heat exchanger arranged in an exhaust blower section.

[0016] Hereinafter, an outdoor air processing unit 1 according to an embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 is a perspective view of the outdoor air processing unit 1 according to an embodiment of the present invention. Fig. 2 is a schematic diagram showing the configuration of the outdoor air processing unit 1 according to an embodiment of the present invention and the state in which the outdoor air processing unit 1 is connected to a target room R. Fig. 1(a) shows the external configuration of a main body 10 of the outdoor air processing unit 1, and Fig. 1(b) shows the state in which a return air duct 38 is further attached to the main body 10.

[0017] As shown in Figures 1 and 2, the main body 10 of the outside air processing device 1 of this embodiment is composed of an upper casing KH and a lower casing KL that are box-shaped and made of metal (e.g., iron or aluminum), and various devices are unitized inside. An exhaust fan 31 is provided on the upper wall of the upper casing KH, and openings 34 are provided on the left and right walls. A first heat exchanger 21 and a second heat exchanger 22 are respectively arranged near the left and right openings 34 in the upper casing KH so as to cover the openings 34. The upper casing KH is where the first heat exchanger 21 and the second heat exchanger 22 are arranged, and constitutes an exhaust blower section 11 equipped with an exhaust fan 31.

[0018] The first heat exchanger 21 and the second heat exchanger 22 are disposed in the exhaust blower section 11, facing each other and spaced apart from each other on the left and right sides of the exhaust fan 31. The first heat exchanger 21 and the second heat exchanger 22 function as condensers during cooling operation in summer, and cool the high-pressure, high-temperature refrigerant gas therein by using outside air OA or the like, thereby condensing and liquefying the refrigerant gas. The condensed and liquefied refrigerant gas is circulated through the refrigerant piping 25 to the third heat exchanger 23, which will be described later.

[0019] Hoods 35 are provided on the left and right sides of the upper casing KH to cover the left and right openings 34. The hoods 35 are provided adjacent to the opposite surfaces of the first heat exchanger 21 and the second heat exchanger 22, which are disposed facing each other at a distance in the exhaust blower section 11. The lower part of the hood 35 is an outside air intake 36 for taking in outside air OA. A return air intake 37 for taking in return air RA is provided on the side of the hood 35. A return air duct 38 for taking in return air RA from the ventilation exhaust port of the target room R to the hood 35 is connected to the return air intake 37 as shown in FIG. 1(b). An insect screen (not shown) is provided on the return air intake 37 to prevent insects and the like from entering the return air duct 38. When the return air duct 38 is not connected, a cover is attached to the return air intake 37 as shown in FIG. 1(a). The opening areas of the left and right return air intakes 37 are the same in order to equalize the left and right air volumes. By equalizing the air volumes from the left and right return air intakes 37, the heat load on the first heat exchanger 21 and the second heat exchanger 22 is equalized, enabling the refrigeration cycle to continue operating more energy-efficiently and stably. The return air intakes 37 may be provided on the left and right hoods 35 on the side facing the front of the device, or on the side facing the rear of the device. The position at which the return air intakes 37 are formed is changed depending on the extension direction of the return air duct 38.

[0020] The return air duct 38 is a rectangular pipe made of metal (for example, iron or aluminum) and is composed of a main pipe 38a having one end connected to the ventilation exhaust port of the target room R, and branch pipes 38b, 38c branching off from the main pipe 38a and having ends connected to the return air intakes 37 of the left and right hoods 35, respectively. One end of the return air duct 38 is connected to the ventilation exhaust port of the target room R, and the other end is connected to the return air intakes 37, so that the return air RA is supplied into the hood 35.

[0021] The return air duct 38 is provided with a return air fan 33 for blowing the return air RA from the target room R to the return air inlet 37. The return air RA supplied to the hood 35 via the return air duct 38 and the return air inlet 37 is mixed with the outside air OA taken into the hood 35. In other words, the inside of the hood 35 is an air mixing section 13 that mixes the taken-in outside air OA and the return air RA. The mixed air of the outside air OA and the return air RA is blown from the left and right openings 34 of the upper casing KH to the first heat exchanger 21 and the second heat exchanger 22, respectively.

[0022] Examples of the target room R as a target space to which the outdoor air processing machine 1 of this embodiment processes outdoor air and supplies temperature and humidity-adjusted air (supply air SA) include large facilities such as hospitals, elderly care facilities, and buildings, and production process facilities such as factories. The target room R is also provided with a return air exhaust port to which the return air duct 38 is attached, an intake port that takes in the supply air SA from the outdoor air processing machine 1, and a local exhaust fan that assists indoor ventilation. By connecting the return air duct 38 to an exhaust port of the local exhaust fan, it is also possible to use the exhaust air that is being discarded as return air.

[0023] The lower casing KL is configured to have left and right openings 44, similar to the upper casing KH. A hood 45 that covers the right opening 44a is provided on the right side of the lower casing KL. Below the hood 45 is an outside air intake 46 for taking in outside air OA. The outside air OA taken in from the outside air intake 46 passes through the right opening 44a and is supplied into the lower casing KL. The left opening 44b of the lower casing KL is an air supply port that adjusts the temperature and humidity of the taken-in outside air OA and supplies it as supply air SA into the target room R. An air supply duct (not shown) for blowing the supply air SA into the target room R is connected to the left opening 44b.

[0024] A third heat exchanger 23 is disposed near the right opening 44a in the lower casing KL. The third heat exchanger 23 functions as an evaporator during cooling operation in summer, and exchanges heat with the outside air OA flowing from right to left of the lower casing KL shown in Fig. 2 by utilizing the latent heat of evaporation of the condensed and liquefied refrigerant circulating inside. For this reason, the third heat exchanger 23 is connected by a refrigerant pipe 25 to the first heat exchanger 21 and the second heat exchanger 22 functioning as condensers, and the condensed and liquefied refrigerant is supplied to the third heat exchanger 23 from the first heat exchanger 21 and the second heat exchanger 22.

[0025] A compressor 26 and an expansion valve 27 are interposed in the refrigerant piping 25 connecting the first heat exchanger 21, the second heat exchanger 22, and the third heat exchanger 23. The compressor 26 compresses and increases the pressure of the refrigerant evaporated in the evaporator. The expansion valve 27 reduces the pressure of the refrigerant condensed in the condenser to lower the refrigerant temperature. In this embodiment, the compressor 26 is disposed in the lower casing KL.

[0026] The heat pump circuit 20 in this embodiment is composed of the first heat exchanger 21 and the second heat exchanger 22 installed near the left and right openings 34 of the upper casing KH, the third heat exchanger 23 installed in the lower casing KL, the refrigerant pipe 25 connecting the first heat exchanger 21, the second heat exchanger 22, and the third heat exchanger 23, and the compressor 26 and the expansion valve 27 installed in the refrigerant pipe 25. The first heat exchanger 21, the second heat exchanger 22, and the third heat exchanger 23 that constitute the heat pump circuit operate to function as an evaporator or a condenser depending on the season. That is, during heating operation in winter, the first heat exchanger 21 and the second heat exchanger 22 function as evaporators, and the third heat exchanger 23 functions as a condenser.

[0027] According to the outdoor air processing device 1 having the above-mentioned configuration, in summer, the first heat exchanger 21 and the second heat exchanger 22 arranged in the upper casing KH function as condensers, and heat is released to the outside from the condenser by using a mixture of high-temperature outdoor air OA (e.g., 35°C) and return air RA from the target room R adjusted to a temperature lower than the outdoor air OA by air conditioning (e.g., 25°C). On the other hand, the third heat exchanger 23 arranged in the lower casing KL functions as an evaporator, and the high-temperature outdoor air OA is cooled and supplied to the target room R as supply air SA. In addition, in winter, the first heat exchanger 21 and the second heat exchanger 22 arranged in the upper casing KH function as evaporators, and heat is absorbed by the evaporator by using a mixture of low-temperature outdoor air OA (e.g., 5°C) and return air RA from the target room R adjusted to a temperature higher than the outdoor air OA by air conditioning (e.g., 20°C). On the other hand, the low-temperature outside air OA is heated and supplied to the target room R as the supply air SA by causing the third heat exchanger 23 arranged in the lower casing KL to function as a condenser.

[0028] The refrigeration cycle of the heat pump in the outdoor air processing machine 1 in summer will be described with reference to Fig. 3. Fig. 3 is a diagram for explaining the refrigeration cycle of the heat pump during cooling operation in summer of the outdoor air processing machine 1. Fig. 3 shows a ph diagram representing the refrigeration cycle of the heat pump in summer, in which (a) shows a case where only outdoor air OA is supplied to the first heat exchanger 21 and the second heat exchanger 22 without mixing return air RA (hereinafter referred to as a comparative example without heat recovery), and (b) shows a case where return air RA and outdoor air OA are mixed and supplied to the first heat exchanger 21 and the second heat exchanger 22 (hereinafter referred to as an embodiment with heat recovery).

[0029] The ph diagram shows the saturation curve, which is the boundary between the gas phase and the liquid phase of the refrigerant, with the pressure p on the vertical axis and the specific enthalpy h on the horizontal axis. In FIG. 3, the refrigeration cycle is drawn with a thick line on the ph diagram. In the diagram, points 1-2 indicate the state change of the refrigerant in the compressor 26, points 2-3 indicate the state change of the refrigerant in the condenser, points 3-4 indicate the state change of the refrigerant in the expansion valve, and points 4-1 indicate the state change of the refrigerant in the evaporator. That is, in the refrigeration cycle, the refrigerant repeats state changes in the order of points 1-2-3-4-1. In FIG. 3(b), the refrigeration cycle of the comparative example without heat recovery is shown with a dashed line, and the embodiment with heat recovery is shown with a solid line.

[0030] In the refrigeration cycle shown in Fig. 3, when attention is paid to the change in state of the refrigerant in the compressor 26, the power of the compressor 26 read from the difference in specific enthalpy h between points 1 and 2 is smaller for compressor power B of the embodiment with heat recovery than for compressor power A of the comparative example without heat recovery. In other words, it can be understood that the power of the compressor 26 is reduced by heat recovery by mixing the return air RA with the outside air, and the COP of the heat pump is improved.

[0031] Furthermore, the relationship between the return air RA recovery ratio and improvement in COP will be described with reference to Fig. 4. Fig. 4 is a diagram for explaining the results of a simulation of changes in power consumption and compressor COP for each return air RA recovery ratio during rated operation of the outdoor air treatment unit 1.

[0032] The simulation conditions are shown in Table 1. In this simulation, the COP was calculated using the value of the power consumption of the compressor 26 alone, which does not include the power consumption of the intake air fan 32 and the exhaust fan 31.

[0033] [Table 1]

[0034] The right side of FIG. 4 (a) shows the case of cooling operation in summer, and the left side of FIG. 4 (b) shows the case of heating operation in winter. In each graph in the figure, the horizontal axis is the heat recovery airflow ratio (RA / SA) (%). A heat recovery airflow ratio of 0% indicates that the return air RA supplied to the exhaust air blower 11 is 0 CMH (cubic meter per hour), and a heat recovery airflow ratio of 100% indicates that the return air RA supplied to the exhaust air blower 11 is 10,000 CMH. The vertical axis of the upper graph in the figure is the power consumption (kW) of the compressor 26, and the vertical axis of the middle graph is the condensation temperature (°C) and evaporation temperature (°C) when the first heat exchanger 21 and the second heat exchanger 22 function as a condenser or an evaporator. The vertical axis of the lower graph is the cooling COP in summer and the heating COP in winter.

[0035] The power consumption (kW) of the compressor 26 is calculated by the following formula (1). The cooling COP is calculated by the following formula (2), and the heating COP is calculated by the following formula (3). Power consumption (kW) = Input power (kW) (1) Cooling COP = cooling capacity (kW) / cooling power consumption (kW) (2) Heating COP = heating capacity (kW) / heating power consumption (kW) (3)

[0036] As shown in the upper part of Fig. 4, the input power to the compressor 26 decreases as the proportion of return air RA increases. As shown in the middle part of Fig. 4, the condensation temperature in summer decreases as the proportion of return air RA increases, and the evaporation temperature in winter increases as the proportion of return air RA increases. Furthermore, as shown in the lower part of Fig. 4, the cooling COP and heating COP increase as the proportion of return air RA increases. From the above, it can be understood that in the outdoor air treatment unit 1 according to this embodiment, both the cooling efficiency and the heating efficiency are improved by recovering heat from the return air RA.

[0037] Moreover, when the heat recovery airflow ratio (RA / SA) is 40%, the input power to the compressor 26 is reduced by about 3 to 4% during cooling operation in summer and by about 4 to 5% during heating operation in winter, compared to when the heat recovery airflow ratio (RA / SA) is 0%. The condensation temperature in summer drops by about 1°C, and the evaporation temperature in winter rises by about 1.8°C. Furthermore, the cooling COP in summer rises by about 0.1, and the heating COP in winter rises by about 0.3. It was shown that energy saving effects can be obtained simply by replacing 40% of the total airflow supplied to the exhaust air blower 11 with return air RA instead of outdoor air OA.

[0038] The outdoor air processing machine 1 according to the present embodiment as described above can be said to have the following configuration: That is, the outdoor air processing machine 1 supplies air with adjusted temperature and humidity by processing outdoor air into a target space (target room R), and includes a heat pump circuit 20 in which a first heat exchanger 21, a second heat exchanger 22, a third heat exchanger 23, and a compressor 26 are connected by a refrigerant pipe 25, an exhaust air blower section 11 in which the first heat exchanger 21 and the second heat exchanger 22 are arranged and which has an exhaust fan 31 that exhausts air that has passed through the first heat exchanger 21 and the second heat exchanger 22, and an intake air blower section 12 in which the third heat exchanger 23 is arranged and which has an intake air fan 32 that supplies air that has passed through the third heat exchanger to the target space, and further includes an air mixing section 13 connected to the exhaust air blower section 11 and provided with an outdoor air intake 36 that takes in outdoor air OA and a return air intake 37 that takes in return air RA from inside the room.

[0039] In the outdoor air processing machine 1 of this embodiment, even when the volume of the return air RA is small, the air mixed with the outdoor air OA in the air mixing section 13 can be supplied to the exhaust air blowing section 11, so that the outdoor air processing machine 1 can be operated with less energy than before without causing a shortage of air volume. In other words, it is possible to achieve energy saving.

[0040] Furthermore, since the outdoor air treatment machine 1 in this embodiment can take in outdoor air OA even if the supply of return air RA is stopped, outdoor air treatment can be performed without stopping the heat pump even in facilities where the amount of return air RA discharged is small.

[0041] In addition, in winter, the outdoor air OA taken in by the outdoor air processing unit 1 is mixed with the return air RA, so that air at a temperature higher than the outdoor air temperature passes through the first heat exchanger 21 and the second heat exchanger 22. This increases the evaporation temperature and compensates for the lack of heating capacity, so that the first heat exchanger 21 and the second heat exchanger 22 functioning as evaporators are less likely to frost, and defrosting is suppressed. In this way, the frequency of defrosting is reduced, so that the feeling of cold air during defrosting in the target room R can be reduced, and the outdoor air processing unit 1 can be operated efficiently even in winter.

[0042] An example of an embodiment of the present invention has been described above, but the specific configuration of the present invention is not limited to the above embodiment, and design changes and the like that do not deviate from the gist of the invention are also included in the present invention.

[0043] As shown in Fig. 4, the more the return air RA, the more energy saving is achieved, but the amount of return air RA discharged varies depending on the size of the facility in which the outdoor air processor is installed, the purpose of use, and other characteristics. By adjusting the size (maximum opening area) of the return air intake 37 to a size at which the static pressure is 0 Pa, and providing the return air intake 37 with a throttle mechanism (for example, a slit for adjusting the air volume) that changes the opening area of ​​the return air intake 37, the amount of return air RA taken in may be changed to an arbitrary air volume depending on the facility in which the outdoor air processor 1 is installed. Also, an adjustment damper may be placed in the return air duct 38 to adjust the air volume of the return air RA.

[0044] Also, for example, a reheater may be disposed downstream of the third heat exchanger 23 functioning as an evaporator to prevent excessive cooling during cooling and dehumidification in intermediate seasons (spring and autumn), and the air cooled and dehumidified by the evaporator and then heated by the reheater may be supplied to the target space as supply air SA. Furthermore, an evaporative humidifier may be additionally disposed downstream of the third heat exchanger 23 functioning as a condenser to prevent drying during heating, and air humidified by the evaporative humidifier may be supplied to the target space as supply air SA.

[0045] Furthermore, in the above-described embodiment, the return air fan 33 is provided, but if the blowing volume of the return air RA can be ensured by the exhaust fan 31, the return air fan 33 may be omitted. [Explanation of symbols]

[0046] 1. Outdoor air treatment machine 10 Main body 11 Exhaust air blower 12 Air supply and blower section 13 Air mixing section 20 Heat pump circuit 21 1st heat exchanger 22 Second heat exchanger 23 Third heat exchanger 25 Refrigerant piping 26 Compressor 27 Expansion valve 31 Exhaust fan 32 Intake fan 33 Return air fan 34 Opening 35 Food 36 Fresh air intake 37 Return air intake 38 Return Air Duct 44 Opening 45 Food 46 Fresh air intake KH upper casing KL Lower Casing OA Outdoor air SA Air Supply RA return air EA Exhaust R Target room

Claims

1. An outdoor air treatment device that treats outdoor air and supplies temperature- and humidity-adjusted air into a target space, a heat pump circuit in which the first heat exchanger, the second heat exchanger, the third heat exchanger and a compressor are connected by a refrigerant pipe; an exhaust blower section in which the first heat exchanger and the second heat exchanger are disposed and which has an exhaust fan that exhausts air that has passed through each of the first heat exchanger and the second heat exchanger; an air supply blower unit in which the third heat exchanger is disposed and which has an air supply fan that supplies the air that has passed through the third heat exchanger to a target space; Equipped with The air mixing unit is connected to the exhaust blower unit and has an outside air intake port for taking in outside air and a return air intake port for taking in return air from inside the room. the air mixing section is a hood provided adjacent to each of the first heat exchanger and the second heat exchanger that are disposed opposite to the opposing surfaces of the first heat exchanger and the second heat exchanger that are disposed opposite to each other and spaced apart from each other in the exhaust air blowing section, The outside air intake is provided below the hood, The return air intake is provided on a side surface of the hood. Outside air treatment machine.

2. The outdoor air treatment machine according to claim 1 , further comprising a return air duct having one end connected to a return air exhaust port of the target space and the other end connected to the return air intake port, and a return air fan disposed in the return air duct.

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