Air conditioning unit and air conditioning method

Abstract

To provide an air-conditioning unit having excellent ventilation efficiency and easy to construct, and an air-conditioning method.SOLUTION: One aspect of an air-conditioning unit is an air-conditioning unit installed on a floor in an air-conditioned space, where the air-conditioning unit comprises a package-type air conditioner that takes in at least one of return air from the inside of the air-conditioned space and outside air from the outside of the air-conditioned space to produce air supply, and an air supply unit that is attached to the air conditioner and blows out the air supply produced by the air conditioner into the air-conditioned space.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an air conditioning unit and an air conditioning method. [Background technology]

[0002] Due to the recent frequent occurrence of large-scale natural disasters, elementary and junior high school gymnasiums are being used as evacuation shelters, but gymnasiums are often not equipped with air conditioning, as they are not designed to be livable. In addition, as measures against viral infections become more widespread, the risk of infection in evacuation shelters with poor ventilation is becoming more serious.

[0003] A displacement ventilation type air conditioning system (hereinafter referred to as a "displacement air conditioning system") is known as an air conditioning system with high ventilation efficiency. One example of a displacement air conditioning system is described in Patent Document 1, which describes a technology for providing efficient cooling by installing a sock duct in a work area away from the side walls of a production factory and blowing out low-velocity airflow from the sock duct. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-15267 Summary of the Invention [Problem to be solved by the invention]

[0005] The sock duct described in Patent Document 1 is installed in a work area away from the side walls of a production factory. Therefore, if the sock duct is installed in a gymnasium, it may cause a disturbance to users of the gymnasium.

[0006] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an air conditioning unit and an air conditioning method that have high ventilation efficiency and are easy to install. [Means for solving the problem]

[0007] In order to achieve the above object, one aspect of the air conditioning unit according to the present invention is An air conditioning unit installed on the floor within an air-conditioned space, a packaged air conditioner that takes in at least one of return air from within the air-conditioned space and outside air from outside the air-conditioned space to produce supply air; an air supply unit attached to the air conditioner and blowing the supply air produced by the air conditioner into the air-conditioned space; Equipped with.

[0008] According to this aspect, ventilation within the air-conditioned space is achieved by supplying the air produced by the air conditioner provided in the air conditioning unit installed on the floor of the air-conditioned space from the air supply unit attached to the air conditioner to the lower part of the air-conditioned space, thereby achieving high ventilation efficiency. Furthermore, according to this aspect, the air conditioning unit is an integrated device in which the air conditioner and the air supply unit are integrated, making it easy to install within the air-conditioned space.

[0009] In another aspect of the air conditioning unit according to the present invention, The air conditioner is a heat exchanger for adjusting the temperatures of the outside air and the return air; an air supply fan provided downstream of the heat exchanger and configured to send the outside air and the return air to the air supply unit; a housing that houses the heat exchanger and the air supply fan; and The housing includes: a first intake port for introducing the return air and the outside air into a first region between the heat exchanger and the supply air fan inside the housing; a second intake port for introducing the return air and the outside air into a second region inside the housing on the upstream side of the heat exchanger; It has.

[0010] According to this aspect, the air conditioner creates supply air by mixing return air and outside air that are cooled by the heat exchanger with return air and outside air that do not pass through the heat exchanger. This prevents the temperature near the bottom of the air-conditioned space from becoming extremely low during cooling in air conditioning mode, thereby preventing discomfort caused by excessive cooling.

[0011] In another aspect of the air conditioning unit according to the present invention, Further provided is a duct unit that introduces the return air and the outside air into the housing, The duct unit includes: a return air bypass duct that introduces the return air into the first area; an outside air bypass duct that introduces the outside air into the second area; a first damper provided inside the return air bypass duct; a second damper provided inside the outside air bypass duct; It has.

[0012] According to this aspect, by adjusting the opening degree of at least one of the first damper and the second damper during cooling in air conditioning mode, the air conditioner can produce supply air that is slightly cooler than the temperature inside the air-conditioned space, so that the temperature near the bottom of the air-conditioned space does not become extremely low, and discomfort caused by excessive cooling can be suppressed.

[0013] In another aspect of the air conditioning unit according to the present invention, the air conditioner further includes a first filter provided inside the housing and upstream of the heat exchanger, The duct unit includes: A second filter provided inside the return air bypass duct; a third filter provided inside the outside air bypass duct; It further has:

[0014] According to this aspect, the first filter removes pollutants contained in the return air and outside air introduced into the second area, the second filter removes pollutants contained in the return air introduced into the first area, and the third filter removes pollutants contained in the outside air introduced into the second area, so that clean supply air can be blown into the air-conditioned space.

[0015] Furthermore, one aspect of the air conditioning method according to the present invention is to An air conditioning method using an air conditioning unit installed on the floor of an air-conditioned space, comprising: A packaged air conditioner takes in at least one of return air from within the air-conditioned space and outside air from outside the air-conditioned space to create supply air; an air supply unit attached to the air conditioner blowing the supply air into the air-conditioned space; It has.

[0016] According to this aspect, ventilation within the air-conditioned space is achieved by supplying the air produced by the air conditioner provided in the air conditioning unit installed on the floor of the air-conditioned space from the air supply unit attached to the air conditioner to the lower part of the air-conditioned space, thereby achieving high ventilation efficiency. Furthermore, according to this aspect, the air conditioning unit is an integrated device in which the air conditioner and the air supply unit are integrated, making it easy to install within the air-conditioned space. [Effects of the Invention]

[0017] According to one aspect of the present invention, an air conditioning unit and an air conditioning method that have high ventilation efficiency and are easy to install can be provided. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a perspective view illustrating an example of an air conditioning unit according to an embodiment; [Figure 2] FIG. 1 is a perspective view illustrating an example of an air conditioning unit according to an embodiment; [Figure 3] FIG. 1 is a perspective view illustrating an example of an air conditioning unit according to an embodiment; [Figure 4] FIG. 1 is a front view illustrating an example of an air conditioning unit according to an embodiment; [Figure 5] FIG. 1 is a side view illustrating an example of an air conditioning unit according to an embodiment. [Figure 6] Cross-sectional view taken along line BB in Figure 5 [Figure 7] FIG. 1 is a plan view illustrating an example of an air conditioning unit according to an embodiment; [Figure 8] FIG. 1 is a schematic diagram illustrating an example of an air conditioning unit according to an embodiment. [Figure 9]FIG. 10 is a diagram showing the control state of the air conditioning unit during cooling in air conditioning mode. [Figure 10] A diagram showing the control state of the air conditioning unit during heating in air conditioning mode. [Figure 11] FIG. 10 shows the control state of the air conditioning unit during cooling in the all-outdoor air mode. [Figure 12] A diagram showing the control state of the air conditioning unit during heating in all outdoor air mode. [Figure 13] FIG. 1 is a perspective view showing an example of an installation mode of an air conditioning unit according to an embodiment; [Figure 14] FIG. 1 is a plan view showing an example of an installation mode of an air conditioning unit according to an embodiment; [Figure 15] FIG. 10 is a front view showing a first modified example of the air conditioning unit according to the embodiment; [Figure 16] FIG. 10 is a side view showing a first modified example of the air conditioning unit according to the embodiment; [Figure 17] FIG. 10 is a plan view showing a first modified example of the air conditioning unit according to the embodiment; [Figure 18] FIG. 1 is a schematic diagram showing a first modified example of an air conditioning unit according to an embodiment; [Figure 19] FIG. 10 is a front view showing a second modified example of the air conditioning unit according to the embodiment; [Figure 20] FIG. 10 is a side view showing a second modified example of the air conditioning unit according to the embodiment. [Figure 21] FIG. 10 is a plan view showing a second modified example of the air conditioning unit according to the embodiment; [Figure 22] FIG. 10 is a schematic diagram showing a second modified example of the air conditioning unit according to the embodiment; DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, non-limiting exemplary embodiments of the present invention will be described with reference to the accompanying drawings. In all the accompanying drawings, the same or corresponding reference numerals are used to designate the same or corresponding members or parts, and redundant descriptions will be omitted.

[0020] In the following description, the +X direction shown in the drawings is the forward direction (front side), the -X direction is the backward direction (rear side), the +Y direction is the right direction, the -Y direction is the left direction, the +Z direction is the upward direction, and the -Z direction is the downward direction.

[0021] [First embodiment] (Air conditioning unit) An example of an air conditioning unit according to a first embodiment will be described with reference to Figures 1 to 8. Figures 1 and 2 are perspective views of the air conditioning unit as seen from the front, with Figure 1 showing a state in which the front door is closed and Figure 2 showing a state in which the front door and rear door are open. Figure 3 is a perspective view of the air conditioning unit as seen from the rear, showing a state in which the front door is open. Figure 4 is a front view of the air conditioning unit, showing a state in which the front door has been removed. Figure 5 is a side view of the air conditioning unit as seen from the right. Figure 6 is a cross-sectional view taken along line BB in Figure 5. Figure 7 is a plan view of the air conditioning unit as seen from above. Figure 8 is a schematic diagram illustrating the flows of return air RA, outside air OA, and supply air SA in the air conditioning unit.

[0022] The air conditioning unit 1 according to the first embodiment is a reheat type air conditioning unit. The air conditioning unit 1 is installed on the floor in an air-conditioned space P. The air-conditioned space P is, for example, a gymnasium. The air conditioning unit 1 includes an air conditioner 11, an air supply unit 12, a duct unit 13, and a base 14.

[0023] Air conditioner 11 is installed on base 14. Air conditioner 11 may be a commercially available packaged air conditioner with a nominal horsepower of 10. An example of air conditioner 11 is a floor-standing ducted air conditioner (FVYCP280MA) manufactured by Daikin Industries, Ltd. Air conditioner 11 has a lower housing 111, an upper housing 112, a filter 113, a heat exchanger 114, and an intake fan 115.

[0024] The lower housing 111 houses a filter 113, a heat exchanger 114, and an intake fan 115. The lower housing 111 has a return air bypass inlet 111a, an outside air bypass inlet 111b, a return air inlet 111c, an outside air inlet 111d, and an intake air inlet 111e. The return air bypass inlet 111a, the outside air bypass inlet 111b, the return air inlet 111c, and the outside air inlet 111d are each openings that penetrate the back plate of the lower housing 111 and have, for example, a rectangular shape.

[0025] The return air bypass inlet 111a communicates the inside of a return air bypass duct 131 (described later) with the space between the heat exchanger 114 and the intake air fan 115 inside the lower housing 111.

[0026] Outside air bypass inlet 111b provides communication between the inside of outside air bypass duct 132 (described later) and the space between heat exchanger 114 and intake air fan 115 inside lower housing 111.

[0027] The return air inlet 111c connects the inside of a return air duct 133 (described later) with the upstream side of the filter 113 inside the lower housing 111.

[0028] The outside air intake port 111d connects the inside of an outside air duct 134 (described later) with the upstream side of the filter 113 inside the lower housing 111.

[0029] Air intake port 111e is an opening that penetrates the top plate of lower housing 111 and has, for example, a rectangular shape. Air intake port 111e connects the downstream side of air intake fan 115 in lower housing 111 with the inside of upper housing 112.

[0030] Upper housing 112 is separably installed on lower housing 111. Upper housing 112 has a front door 112a, a rear door 112b, and an air intake port 112c.

[0031] The front door 112a is provided so as to be able to be opened and closed freely on the front surface of the upper housing 112. The front door 112a is opened and closed, for example, when adjusting the opening degrees of dampers 131a, 132a, 133a, 134a1, and 134a2, which will be described later.

[0032] Rear door 112b is provided so as to be able to be opened and closed freely on the rear surface of upper housing 112. Rear door 112b is opened and closed, for example, when cleaning or replacing filters 131b and 132b, which will be described later.

[0033] Air supply port 112c is an opening that penetrates the side panel of upper housing 112 on the air supply unit 12 side, and has, for example, a rectangular shape. Air supply port 112c connects the inside of upper housing 112 and the inside of air supply unit 12.

[0034] The filter 113 is provided inside the lower housing 111. The filter 113 removes contaminants (e.g., dust) contained in the return air RA introduced through the return air inlet 111c, the outside air OA introduced through the outside air inlet 111d, and the mixture of these airs. The filter 113 is, for example, a medium- to high-performance air filter. The reason why a HEPA filter (High Efficiency Particulate Air Filter) is not used as the filter 113 is that commercially available packaged air conditioners may not have sufficient static pressure, requiring a separate booster fan. Unlike a clean room with a high level of cleanliness, if the air-conditioned space P is an air-conditioned space with a relatively low level of cleanliness, such as a gymnasium, a medium- to high-performance air filter will suffice. An air-conditioning unit using a medium- to high-performance filter does not require a booster fan and can have a relatively simple and inexpensive configuration.

[0035] The heat exchanger 114 is provided downstream of the filter 113. The heat exchanger 114 adjusts the temperature of the return air RA, the outside air OA, and the mixture of these air that have passed through the filter 113. The heat exchanger 114 is, for example, a coil type, a multi-tube type, or a fin tube type.

[0036] The air supply fan 115 is provided downstream of the heat exchanger 114. The air supply fan 115 sends out the return air RA, the outside air OA, and a mixture thereof to the air supply unit 12 as the supply air SA.

[0037] The air conditioner 11 takes in at least one of the return air RA sucked in through the return air bypass inlet 111a, the outdoor air OA sucked in through the outdoor air bypass inlet 111b, the return air RA sucked in through the return air inlet 111c, and the outdoor air OA sucked in through the outdoor air inlet 111d to create supply air SA and send it to the air supply unit 12.

[0038] The air supply unit 12 is attached to the left wall of the air conditioner 11 on the base 14. However, the air supply unit 12 may also be attached to the right wall of the air conditioner 11 on the base 14. The position at which the air supply unit 12 is attached is determined depending on the location where the air conditioning unit 1 is installed. The air supply unit 12 has a housing 121, a flow straightening cloth 122, and an air outlet 123.

[0039] The housing 121 is attached to the left wall of the air conditioner 11. However, the housing 121 may also be attached to the right wall of the air conditioner 11. The position at which the housing 121 is attached is determined depending on the location where the air conditioning unit 1 is installed. The housing 121 is formed, for example, from an electro-galvanized steel sheet.

[0040] The flow rectifying cloth 122 is provided inside the housing 121. The flow rectifying cloth 122 equalizes the flow of the supply air SA from the air conditioner 11. The flow rectifying cloth 122 has, for example, an inverted cone shape with a diameter that decreases downward. The flow rectifying cloth 122 is made of, for example, polyester.

[0041] Air outlet 123 is provided on the front surface of air supply unit 12. Air outlet 123 blows out supply air SA, the flow of which has been made uniform by flow straightening cloth 122, into air-conditioned space P. Air outlet 123 is a perforated louver made of, for example, electrogalvanized steel sheet.

[0042] The air supply unit 12 blows the supply air SA generated by the air conditioner 11 from the outlet 123 at a low speed toward the lower part of the air-conditioned space P, particularly along the floor surface, so as not to disturb the airflow in the air-conditioned space P. The air speed of the supply air SA blown out from the air supply unit 12 is preferably, for example, 0.5 m / sec or less. This makes it possible to achieve comfortable air conditioning without a draft feeling. The air supply unit 12 may also have multiple guide fins (not shown) fixed to the outlet 123 to impart a swirl component to the supply air SA blown into the air-conditioned space P. The guide fins are, for example, guide fins that impart a swirl component, as disclosed in Japanese Patent No. 442134. When the air supply unit 12 has multiple guide fins, the supply air SA generated by the air conditioner 11 can be imparted with a swirl component and blown into the air-conditioned space P from the outlet 123. This increases the amount of air drawn (induction ratio) in the air-conditioned space P by the blown-out supply air volume. As the amount of air drawn increases, the speed of the supply air SA decreases in accordance with the law of conservation of momentum, and it quickly decelerates. Furthermore, as the amount of air drawn increases, the supply air SA can be quickly heated, further reducing the temperature difference between the top and bottom of the air-conditioned space P. As a result, the air-conditioned space P can be efficiently conditioned with as little airflow as possible, resulting in excellent energy savings.

[0043] The duct unit 13 is attached to the back surface of the air conditioner 11 on the base 14. The duct unit 13 has a return air bypass duct 131, an outside air bypass duct 132, a return air duct 133, and an outside air duct 134. The return air bypass duct 131, the outside air bypass duct 132, the return air duct 133, and the outside air duct 134 each extend in the vertical direction and are arranged in parallel.

[0044] The return air bypass duct 131 is a rectangular duct extending in the vertical direction on the back side of the air conditioner 11. The upper end of the return air bypass duct 131 communicates with the air-conditioned space P, and the lower end communicates with the interior of the lower housing 111 via the return air bypass inlet 111a. The upper end of the return air bypass duct 131 is located above the occupied area in the air-conditioned space P (for example, at a height of 2.5 m from the installation surface of the air conditioning unit 1). The return air bypass duct 131 introduces the return air RA from the air-conditioned space P into between the heat exchanger 114 and the supply air fan 115 inside the lower housing 111 via the return air bypass inlet 111a. In other words, the return air bypass duct 131 introduces the return air RA from the air-conditioned space P into the interior of the lower housing 111 without passing through the filter 113 and the heat exchanger 114. The return air RA introduced into the lower housing 111 from the return air bypass duct 131 is sent to the air supply unit 12 by the air supply fan 115 without passing through the filter 113 and the heat exchanger 114. The return air bypass duct 131 is provided with a damper 131a and a filter 131b. The damper 131a adjusts the volume of the return air RA flowing through the return air bypass duct 131. The damper 131a is, for example, a volume damper (VD). However, the damper 131a may also be a motor damper (MD). The filter 131b removes contaminants (e.g., dust) contained in the return air RA flowing through the return air bypass duct 131. As a result, the return air RA from which the contaminants have been removed is introduced into the lower housing 111. The filter 131b is, for example, a medium- to high-performance air filter.

[0045] The outside air bypass duct 132 is provided adjacent to the return air bypass duct 131. The outside air bypass duct 132 is a rectangular duct that extends in the vertical direction on the back side of the air conditioner 11. The upper end of the outside air bypass duct 132 communicates with the outside of the air-conditioned space P, and the lower end communicates with the inside of the lower housing 111 via the outside air bypass inlet 111b. The outside air bypass duct 132 introduces outside air OA from outside the air-conditioned space P into a space between the heat exchanger 114 and the supply air fan 115 inside the lower housing 111 via the outside air bypass inlet 111b. In other words, the outside air bypass duct 132 introduces the outside air OA from outside the air-conditioned space P into the inside of the lower housing 111 without passing through the filter 113 and the heat exchanger 114. The outside air OA introduced into the inside of the lower housing 111 from the outside air bypass duct 132 is sent to the air supply unit 12 by the air supply fan 115 without passing through the filter 113 and the heat exchanger 114. The outside air bypass duct 132 is provided with a damper 132a and a filter 132b. The damper 132a adjusts the volume of the outside air OA flowing through the outside air bypass duct 132. The damper 132a is, for example, an air volume adjustment damper. However, the damper 132a may also be a motor damper. The filter 132b removes contaminants (e.g., dust) contained in the outside air OA flowing through the outside air bypass duct 132. As a result, the outside air OA from which the contaminants have been removed is introduced into the inside of the lower housing 111. The filter 132b is, for example, a medium- to high-performance air filter.

[0046] The return air duct 133 is provided adjacent to the return air bypass duct 131. The return air duct 133 is a rectangular duct extending in the vertical direction on the rear side of the air conditioner 11. The upper end of the return air duct 133 communicates with the air-conditioned space P, and the lower end communicates with the interior of the lower housing 111 via the return air inlet 111c. The upper end of the return air duct 133 is located above the occupied area in the air-conditioned space P (for example, at a height of 2.5 m from the installation surface of the air conditioning unit 1). The return air duct 133 introduces the return air RA from the air-conditioned space P to the interior of the lower housing 111 upstream of the filter 113 via the return air inlet 111c. The return air RA introduced from the return air duct 133 into the interior of the lower housing 111 passes through the filter 113 and the heat exchanger 114 and is sent to the air supply unit 12 by the air supply fan 115. A damper 133a is provided in the return air duct 133. The damper 133a adjusts the air volume of the return air RA flowing through the return air duct 133. The damper 133a is, for example, an air volume adjustment damper. However, the damper 133a may also be a motor damper.

[0047] The outside air duct 134 is provided adjacent to the outside air bypass duct 132. The outside air duct 134 is a rectangular duct extending in the vertical direction on the rear side of the air conditioner 11. The upper end of the outside air duct 134 communicates with the outside of the air-conditioned space P, and the lower end communicates with the inside of the lower housing 111 via the outside air inlet 111d. The outside air duct 134 introduces outside air OA from outside the air-conditioned space P into the inside of the lower housing 111 upstream of the filter 113. The outside air OA introduced from the outside air duct 134 into the inside of the lower housing 111 passes through the filter 113 and the heat exchanger 114 and is sent to the air supply unit 12 by the air supply fan 115. Dampers 134a1 and 134a2 are provided in the outside air duct 134. The dampers 134a1 and 134a2 adjust the volume of outside air OA flowing through the outside air duct 134. The dampers 134a1 and 134a2 are, for example, air volume adjustment dampers. However, the dampers 134a1 and 134a2 may also be motor dampers.

[0048] The base 14 holds the air conditioner 11, the air supply unit 12, and the duct unit 13.

[0049] (Air conditioning unit operation) An example of the operation of the air conditioning unit 1 of the embodiment will be described with reference to Figures 9 to 12. The air conditioning unit 1 operates in any one of the control states of cooling in air conditioning mode, heating in air conditioning mode, cooling in all outdoor air mode, and heating in all outdoor air mode.

[0050] FIG. 9 is a diagram showing the control state of the air conditioning unit 1 during cooling in the air conditioning mode. In FIG. 9, ducts through which at least one of the return air RA, the outside air OA, and the supply air SA flows are indicated by thick solid lines. As shown in FIG. 9, during cooling in the air conditioning mode, a predetermined flow rate (for example, 1200 m) is maintained between the heat exchanger 114 and the supply air fan 115 inside the lower housing 111 by adjusting the opening degree of the damper 131a. 3 / h) of return air RA is introduced. By adjusting the opening of the damper 133a, a predetermined flow rate (for example, 1950 m 3 / h) of return air RA is introduced. By adjusting the opening of the damper 134a2, a predetermined flow rate (for example, 1350 m 3 / h of outside air OA is introduced. Also, the dampers 132a and 134a1 are closed.

[0051] As a result, during cooling in the air conditioning mode, a mixture of return air RA introduced into the inside of the lower housing 111 from the return air duct 133 and outside air OA introduced into the inside of the lower housing 111 from the outside air duct 134 is cooled by the heat exchanger 114. The cooled mixed air is mixed with return air RA introduced into the inside of the lower housing 111 from the return air bypass duct 131 without passing through the filter 113 and the heat exchanger 114. As a result, supply air SA is produced at a temperature suitable for the supply air of the air supply unit 12, in other words, at a temperature slightly lower than the temperature in the air-conditioned space P. The supply air SA produced by the air conditioner 11 is sent to the air supply unit 12 and flows from the air outlet 123 at a predetermined flow rate (for example, 4500 m 3 / h) into the air-conditioned space P. As a result, the temperature near the bottom of the air-conditioned space P does not become extremely low, preventing discomfort due to excessive cooling. Temperature stratification is also formed in the air-conditioned space P. This allows the living space to be filled with air purified by the medium- to high-performance air filter provided in the air-conditioning unit 1, and airborne dust and tiny viruses are carried upward by the air moving upward. Therefore, the air-conditioned space P can be kept clean from the floor of the air-conditioned space to around the height of the air supply unit 12. As a result, it is expected that the risk of infection will be reduced if the gymnasium is used as an evacuation site.

[0052] On the other hand, if the return air bypass inlet 111a and the return air bypass duct 131 are not provided, the mixed air cooled by the heat exchanger 114 is directly sent to the air supply unit 12 as the supply air SA. As a result, the temperature of the supply air SA may become lower than the temperature suitable for supplying air to the air supply unit 12, resulting in excessive cooling. As a result, the temperature near the bottom of the air-conditioned space P becomes low, which may cause discomfort due to excessive cooling.

[0053] FIG. 10 is a diagram showing the control state of the air conditioning unit 1 during heating in the air conditioning mode. In FIG. 10, ducts through which at least one of the return air RA, the outside air OA, and the supply air SA flows are indicated by thick solid lines. As shown in FIG. 10, during heating in the air conditioning mode, a predetermined flow rate (for example, 3150 m) is maintained upstream of the filter 113 inside the lower housing 111 by adjusting the opening degree of the damper 133a. 3 / h) of return air RA is introduced. By adjusting the opening of the damper 134a2, a predetermined flow rate (for example, 1350 m 3 / h of outside air OA is introduced. Also, the dampers 131a, 132a, and 134a1 are closed.

[0054] As a result, during heating in the air conditioning mode, a mixture of return air RA introduced into the inside of the lower housing 111 from the return air duct 133 and outside air OA introduced into the inside of the lower housing 111 from the outside air duct 134 is heated by the heat exchanger 114. The heated mixed air is sent out to the air supply unit 12 and blown out from the air outlet 123 at a predetermined flow rate (for example, 4500 m 3 / h) into the air-conditioned space P.

[0055] FIG. 11 is a diagram showing the control state of the air conditioning unit 1 during cooling in the all-outdoor air mode. In FIG. 11, ducts through which at least one of the return air RA, the outdoor air OA, and the supply air SA flows are indicated by thick solid lines. As shown in FIG. 11, during cooling in the all-outdoor air mode, a predetermined flow rate (for example, 2000 m) is maintained between the heat exchanger 114 and the supply air fan 115 inside the lower housing 111 by adjusting the opening degree of the damper 132a. 3 Also, by adjusting the opening of the damper 134a1, a predetermined flow rate (1150 m3 / h) of outside air is introduced into the lower housing 111 on the upstream side of the filter 113. 3 Also, by adjusting the opening of the damper 134a2, a predetermined flow rate (1350 m / h) of outside air is introduced into the lower housing 111 on the upstream side of the filter 113. 3 / h of outside air OA is introduced. Also, the dampers 131a and 133a are closed.

[0056] As a result, during cooling in the all outdoor air mode, the outdoor air OA introduced from the outdoor air duct 134 into the interior of the lower housing 111 is cooled by the heat exchanger 114. The cooled outdoor air OA is mixed with the outdoor air OA introduced from the outdoor air bypass duct 132 into the interior of the lower housing 111 without passing through the filter 113 and the heat exchanger 114. As a result, supply air SA is produced at a temperature suitable for the supply air of the air supply unit 12, in other words, at a temperature slightly lower than the temperature in the air-conditioned space P. The supply air SA produced by the air conditioner 11 is sent to the air supply unit 12 and flows from the air outlet 123 at a predetermined flow rate (for example, 4500 m 3 / h) into the air-conditioned space P. As a result, the temperature near the bottom of the air-conditioned space P does not become extremely low, preventing discomfort due to excessive cooling. Temperature stratification is also formed in the air-conditioned space P. This allows the living space to be filled with air purified by the medium- to high-performance air filter provided in the air-conditioning unit 1, and airborne dust and tiny viruses are carried upward by the air moving upward. Therefore, the air-conditioned space P can be kept clean from the floor of the air-conditioned space to around the height of the air supply unit 12. As a result, it is expected that the risk of infection will be reduced if the gymnasium is used as an evacuation site.

[0057] On the other hand, if the outside air bypass inlet 111b and the outside air bypass duct 132 are not provided, the outside air OA cooled by the heat exchanger 114 is directly sent to the air supply unit 12 as the supply air SA. As a result, the temperature of the supply air SA may become lower than the temperature suitable for supplying air to the air supply unit 12, resulting in excessive cooling. As a result, the temperature near the bottom of the air-conditioned space P becomes low, which may cause discomfort due to excessive cooling.

[0058] FIG. 12 is a diagram showing the control state of the air conditioning unit 1 during heating in the all-outdoor air mode. In FIG. 12, ducts through which at least one of the return air RA, the outdoor air OA, and the supply air SA flows are indicated by thick solid lines. As shown in FIG. 12, during heating in the all-outdoor air mode, a predetermined flow rate (for example, 2000 m) is maintained between the heat exchanger 114 and the supply air fan 115 inside the lower housing 111 by adjusting the opening degree of the damper 132a. 3 Also, by adjusting the opening of the damper 134a1, a predetermined flow rate (1150 m3 / h) of outside air is introduced into the lower housing 111 on the upstream side of the filter 113. 3 Also, by adjusting the opening of the damper 134a2, a predetermined flow rate (1350 m3 / h) of outside air is introduced into the lower housing 111 on the upstream side of the filter 113. 3 / h of outside air OA is introduced. Also, the dampers 131a and 133a are closed.

[0059] As a result, during heating in the all outside air mode, the mixed air with the outside air OA introduced into the inside of the lower housing 111 from the outside air duct 134 is heated by the heat exchanger 114. The heated mixed air is mixed with the outside air OA introduced into the inside of the lower housing 111 from the outside air bypass duct 132 without passing through the filter 113 and the heat exchanger 114, and is sent out to the air supply unit 12, and is discharged from the air outlet 123 at a predetermined flow rate (for example, 4500 m 3 / h) into the air-conditioned space P.

[0060] (Installation of air conditioning unit) 13 and 14, as an example of an installation mode of the air conditioning unit 1 of the embodiment, a case where the air conditioning unit 1 is installed in a gymnasium 5, which is an example of an air-conditioned space P, will be described. Fig. 13 is a schematic diagram of the gymnasium 5 in which the air conditioning unit 1 is installed, viewed from the front side. Fig. 14 is a schematic diagram of the gymnasium 5 in which the air conditioning unit 1 is installed, viewed from above, with the ceiling 51 removed for ease of explanation.

[0061] The gymnasium 5 has a substantially rectangular parallelepiped space, and is divided by a ceiling 51, a floor 52, a front wall 53, a back wall 54, a right wall 55, and a left wall 56. The area of ​​the floor 52 is, for example, 600 m 3 and the height from the floor 52 to the ceiling 51 is, for example, 10 m.

[0062] The air conditioning units 1 are installed on the floor 52 at the four corners of the gymnasium 5. That is, the air conditioning units 1 are installed on the floor 52 on the right side wall 55 near the front wall 53, on the floor 52 on the right side wall 55 near the back wall 54, on the floor 52 on the left side wall 56 near the front wall 53, and on the floor 52 on the left side wall 56 near the back wall 54. The air conditioning unit 1 installed on the floor 52 on the right side wall 55 near the front wall 53 and the air conditioning unit 1 installed on the floor 52 on the left side wall 56 near the front wall 53 are, for example, arranged opposite each other. Furthermore, the air conditioning unit 1 installed on the floor 52 on the right side wall 55 near the back wall 54 and the air conditioning unit 1 installed on the floor 52 on the left side wall 56 near the back wall 54 are, for example, arranged opposite each other. However, the arrangement and number of the air conditioning units 1 are not limited to this and are determined depending on the shape, size, window arrangement, etc. of the gymnasium 5. The air conditioning unit 1 blows out the supply air SA produced by the air conditioner 11 from the air outlet 123 of the air supply unit 12 toward the lower part (occupancy area) of the gymnasium 5 at a low wind speed (for example, 0.5 m / sec or less) so as not to disturb the air flow in the gymnasium 5.

[0063] (Actions and Effects) According to the air conditioning unit 1 of the first embodiment, supply air SA that is slightly cooler than the temperature within the air conditioned space P is supplied to a lower portion of the air conditioned space P (e.g., the occupied area) at a low wind speed (e.g., 0.5 m / sec or less). As a result, the supply air SA supplied into the air conditioned space P is heated by a heating element or the like present in the air conditioned space P, causing an upward flow, which carries contaminants such as dust and gases generated within the air conditioned space P to the upper portion of the air conditioned space P. The contaminants are then taken in together with the heated supply air SA from the upper end of the return air bypass duct 131 and the upper end of the return air duct 133 of the air conditioning unit 1, which are located above the occupied area within the air conditioned space P, thereby ventilating the air conditioned space P.

[0064] In this way, the supply air SA supplied into the air-conditioned space P is heated by a heating element or the like present in the air-conditioned space P, generating a pressurized rising air current, which makes it difficult for contaminated air to spread. Therefore, even when using the gymnasium 5 as an evacuation shelter, it is difficult for people to come into contact with contaminated air. In addition, the piston flow allows for fast replacement of contaminated air, resulting in high ventilation efficiency.

[0065] In addition, since the airflow velocity of the supply air SA supplied into the air-conditioned space P is 0.5 m / sec or less, there is no draft feeling and comfortable air conditioning can be achieved. Also, since only the occupied area is air-conditioned, it is highly energy-efficient.

[0066] Furthermore, since the air conditioning unit 1 is an integrated device in which the air conditioner 11, the air supply unit 12, and the duct unit 13 are integrated, it can be easily installed in the air-conditioned space P, and the construction period can be shortened.

[0067] Second Embodiment An example of an air conditioning unit according to the second embodiment will be described with reference to Figures 15 to 18. Figure 15 is a front view of the air conditioning unit with the front door removed. Figure 16 is a side view of the air conditioning unit as seen from the left. Figure 17 is a plan view of the air conditioning unit as seen from above. Figure 18 is a schematic diagram illustrating the flow of outside air OA and supply air SA in the air conditioning unit.

[0068] The air conditioning unit 2 according to the second embodiment differs from the air conditioning unit 1 according to the first embodiment in that it is an all-outdoor air type air conditioning unit. The following will mainly describe the differences from the air conditioning unit 1.

[0069] The air conditioning unit 2 includes an air conditioner 21, an air supply unit 22, and a base 24. However, unlike the air conditioning unit 1, the air conditioning unit 2 does not include a duct unit.

[0070] The air conditioner 21 is installed on a base 24. The air conditioner 21 has a lower housing 211, an upper housing 212, a filter 213, a heat exchanger 214, and an air supply fan 215.

[0071] The lower housing 211 houses a filter 213, a heat exchanger 214, and an air supply fan 215. The lower housing 211 has an outside air inlet 211d and an air supply port 211e.

[0072] Outside air inlet 211d is an opening that penetrates the back plate of lower housing 111 and has, for example, a rectangular shape. An outside air duct (not shown) is connected to outside air inlet 211d. Outside air inlet 211d communicates between the inside of the outside air duct and the upstream side of filter 213 inside lower housing 211.

[0073] Air intake port 211e is an opening that penetrates the top plate of lower housing 211 and has, for example, a rectangular shape. Air intake port 211e connects the downstream side of air intake fan 215 in lower housing 211 with the inside of upper housing 112.

[0074] Upper housing 212, filter 213, heat exchanger 214, and intake fan 215 may have the same configuration as upper housing 112, filter 113, heat exchanger 114, and intake fan 115, respectively.

[0075] The air conditioner 21 takes in outside air OA drawn in through the outside air inlet 211d, creates supply air SA, and sends it out to the air supply unit 22.

[0076] The air supply unit 22 is attached to the right side wall of the air conditioner 21 on the base 24. However, the air supply unit 22 may also be attached to the left side wall of the air conditioner 21 on the base 24. The position at which the air supply unit 22 is attached is determined depending on the location where the air conditioning unit 2 is installed. The air supply unit 22 has a housing 221, a flow rectifying cloth 222, and an air outlet 223. The housing 221, the flow rectifying cloth 222, and the air outlet 223 may have the same configuration as the housing 121, the flow rectifying cloth 122, and the air outlet 123, respectively.

[0077] The air supply unit 22 blows out the supply air SA produced by the air conditioner 21 from the air outlet 223 at a low speed toward the lower part of the air-conditioned space P, particularly along the floor surface, so as not to disturb the airflow within the air-conditioned space P. The air speed of the supply air SA blown out from the air supply unit 22 is preferably 0.5 m / sec or less, for example. This makes it possible to achieve comfortable air conditioning without a draft feeling. The air supply unit 22 may also have multiple guide fins (not shown) fixed to the air outlet 223 to impart a swirl component to the supply air SA blown out into the air-conditioned space P.

[0078] The base 24 holds the air conditioner 21 and the air supply unit 22 .

[0079] As described above, the air conditioning unit 2 according to the second embodiment can provide the same effects as the air conditioning unit 1 according to the first embodiment.

[0080] Furthermore, according to the air conditioning unit 2 according to the second embodiment, since no duct unit is attached to the back surface of the air conditioner 21, the air conditioning unit 2 can be made thinner.

[0081] Third Embodiment An example of an air conditioning unit according to the third embodiment will be described with reference to Figures 19 to 22. Figure 19 is a front view of the air conditioning unit with the front door removed. Figure 20 is a side view of the air conditioning unit as seen from the left. Figure 21 is a plan view of the air conditioning unit as seen from above. Figure 22 is a schematic diagram illustrating the flow of return air RA and supply air SA in the air conditioning unit.

[0082] The air conditioning unit 3 according to the third embodiment differs from the air conditioning unit 1 according to the first embodiment in that it is a circulation type air conditioning unit. The following description will focus on the differences from the air conditioning unit 1.

[0083] The air conditioning unit 3 includes an air conditioner 31, an air supply unit 32, a duct unit 33, and a base .

[0084] The air conditioner 31 is installed on a base 34. The air conditioner 31 has a lower housing 311, an upper housing 312, a filter 313, a heat exchanger 314, and an air supply fan 315.

[0085] The lower housing 311 houses a filter 313, a heat exchanger 314, and an air supply fan 315. The lower housing 311 has a return air inlet 311c and an air supply port 311e.

[0086] The return air inlet 311c is an opening that penetrates the back plate of the lower housing 311 and has, for example, a rectangular shape. The return air inlet 311c communicates the inside of a return air duct 333 (described later) with the upstream side of the filter 313 inside the lower housing 311.

[0087] Air intake port 311e is an opening that penetrates the top plate of lower housing 311 and has, for example, a rectangular shape. Air intake port 311e connects the downstream side of air intake fan 315 in lower housing 311 with the inside of upper housing 312.

[0088] Upper housing 312, filter 313, heat exchanger 314, and intake fan 315 may have the same configuration as upper housing 112, filter 113, heat exchanger 114, and intake fan 115, respectively.

[0089] The air conditioner 31 takes in return air RA sucked in through the return air inlet 311c, creates supply air SA, and sends it to the air supply unit 32.

[0090] The air supply unit 32 is attached to the right side wall of the air conditioner 31 on the base 34. However, the air supply unit 32 may also be attached to the left side wall of the air conditioner 31 on the base 34. The position at which the air supply unit 32 is attached is determined depending on the location where the air conditioning unit 3 is installed. The air supply unit 32 has a housing 321, a flow rectifying cloth 322, and an air outlet 323. The housing 321, the flow rectifying cloth 322, and the air outlet 323 may have the same configuration as the housing 121, the flow rectifying cloth 122, and the air outlet 123, respectively.

[0091] The air supply unit 32 blows out the supply air SA produced by the air conditioner 31 from the air outlet 323 at a low speed toward the lower part of the air-conditioned space P, particularly along the floor surface, so as not to disturb the airflow within the air-conditioned space P. The air speed of the supply air SA blown out from the air supply unit 32 is preferably 0.5 m / sec or less, for example. This makes it possible to achieve comfortable air conditioning without a draft feeling. The air supply unit 32 may also have multiple guide fins (not shown) fixed to the air outlet 323 to impart a swirl component to the supply air SA blown out into the air-conditioned space P.

[0092] The duct unit 33 is attached to the left wall of the air conditioner 31 on the base 34. In other words, the duct unit 33 is attached to the side of the air conditioner 31 on which the air supply unit 32 is not attached. The duct unit 33 has a return air duct 333.

[0093] The return air duct 333 is a rectangular duct extending vertically to the left of the air conditioner 11. The upper end of the return air duct 333 communicates with the air-conditioned space P, and the lower end communicates with the interior of the lower housing 311 via the return air inlet 311c. The upper end of the return air duct 333 is located above the occupied area in the air-conditioned space P (for example, at a height of 2.5 m from the installation surface of the air conditioning unit 3). The return air duct 333 introduces the return air RA from the air-conditioned space P into the interior of the lower housing 311 upstream of the filter 313 via the return air inlet 311c. The return air RA introduced from the return air duct 333 into the interior of the lower housing 311 passes through the filter 313 and the heat exchanger 314, and is sent to the air supply unit 32 by the air supply fan 315. A damper 333a is provided in the return air duct 333. The damper 333a adjusts the air volume of the return air RA flowing through the return air duct 333. The damper 333a is, for example, an air volume adjustment damper. However, the damper 333a may also be a motor damper.

[0094] The base 34 holds the air conditioner 31, the air supply unit 32, and the duct unit 33.

[0095] As described above, the air conditioning unit 3 according to the third embodiment can provide the same effects as the air conditioning unit 1 according to the first embodiment.

[0096] Furthermore, according to the air conditioning unit 3 of the third embodiment, the duct unit 33 is attached to the left wall of the air conditioner 31, so the air conditioning unit 3 can be made thinner.

[0097] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive, and the above-described embodiments may be omitted, substituted, or modified in various ways without departing from the scope and spirit of the appended claims. [Explanation of symbols]

[0098] 1: Air conditioning unit 11:Air conditioner 111: Lower housing 111a: Return air bypass intake 111b: Outside air bypass intake 111c: Return air intake 111d: Fresh air intake 111e:Air supply port 112: Upper housing 112a: Front door 112b: Rear door 112c: Air supply port 113: Filter 114:Heat exchanger 115: Air supply fan 12: Air supply unit 121: Housing 122: Rectifier cloth 123:Air outlet 13: Duct unit 131: Return air bypass duct 131a: Damper 131b: Filter 132: Outdoor air bypass duct 132a: Damper 132b: Filter 133: Return air duct 133a: Damper 134: Fresh air duct 134a1:Damper 134a2:Damper 14: Bass 2: Air conditioning unit 21:Air conditioner 211: Lower housing 211d: Fresh air intake 211e: Air supply port 212: Upper housing 213: Filter 214 :Heat exchanger 215: Air supply fan 22: Air supply unit 221: Housing 222: Rectifying cloth 223: Air outlet 24: Bass 3: Air conditioning unit 31:Air conditioner 311: Lower housing 311c: Return air intake 311e: Air supply port 312: Upper housing 313: Filter 314 :Heat exchanger 315: Air supply fan 32: Air supply unit 321: Housing 322: Rectifier cloth 323:Air outlet 33: Duct unit 333: Return air duct 333a: Damper 34: Bass 5: Gymnasium 51: Ceiling 52: Floor 53:Front wall 54: Back wall 55: Right side wall 56: Left side wall OA: Outside air P:Air conditioned space RA: Return air SA: Air supply

Claims

1. An air conditioning unit installed on the floor within an air-conditioned space, a packaged air conditioner that takes in at least one of return air from within the air-conditioned space and outside air from outside the air-conditioned space to produce supply air; an air supply unit attached to the air conditioner and blowing the supply air generated by the air conditioner into the air-conditioned space; Equipped with The air conditioner is a heat exchanger for adjusting the temperature of the outside air and the return air; an air supply fan provided downstream of the heat exchanger and configured to send the outside air and the return air to the air supply unit; a housing that houses the heat exchanger and the air supply fan; and The housing includes: a first air inlet for introducing the return air and the outside air into a first region between the heat exchanger and the air supply fan inside the housing; a second intake port for introducing the return air and the outside air into a second region inside the housing on the upstream side of the heat exchanger; having Air conditioning unit.

2. Further provided is a duct unit that introduces the return air and the outside air into the housing, The duct unit includes: a return air bypass duct that introduces the return air into the first area; an outside air bypass duct that introduces the outside air into the second area; a first damper provided inside the return air bypass duct; a second damper provided inside the outside air bypass duct; having 10. The air conditioning unit of claim 1.

3. the air conditioner further includes a first filter provided inside the housing and upstream of the heat exchanger, The duct unit includes: A second filter provided inside the return air bypass duct; a third filter provided inside the outside air bypass duct; Further comprising:

3. An air conditioning unit according to claim 2.

4. An air conditioning unit installed on the floor within an air-conditioned space, a packaged air conditioner that takes in at least one of return air from within the air-conditioned space and outside air from outside the air-conditioned space to produce supply air; an air supply unit attached to the air conditioner and blowing the supply air generated by the air conditioner into the air-conditioned space; Equipped with The air conditioner is a heat exchanger for adjusting the temperature of the outside air and the return air; an air supply fan provided downstream of the heat exchanger and configured to send the outside air and the return air to the air supply unit; a housing that houses the heat exchanger and the air supply fan; and A return air duct that introduces the return air into the heat exchanger of the air conditioner; an outside air duct that introduces the outside air into the heat exchanger of the air conditioner; a return air bypass duct that introduces the return air downstream of the heat exchanger; a damper provided in the return air bypass duct; Further comprising: Air conditioning unit.

5. An air conditioning unit installed on the floor within an air-conditioned space, a packaged air conditioner that takes in at least one of return air from within the air-conditioned space and outside air from outside the air-conditioned space to produce supply air; an air supply unit attached to the air conditioner and blowing the supply air generated by the air conditioner into the air-conditioned space; Equipped with The air conditioner is a heat exchanger for adjusting the temperature of the outside air and the return air; an air supply fan provided downstream of the heat exchanger and configured to send the outside air and the return air to the air supply unit; a housing that houses the heat exchanger and the air supply fan; and A return air duct that introduces the return air into the heat exchanger of the air conditioner; an outside air duct that introduces the outside air into the heat exchanger of the air conditioner; an outside air bypass duct that introduces the outside air to a downstream side of the heat exchanger; a damper provided in the outside air bypass duct; Further comprising: Air conditioning unit.

6. An air conditioning unit installed on the floor within an air-conditioned space, a packaged air conditioner that takes in at least one of return air from within the air-conditioned space and outside air from outside the air-conditioned space to produce supply air; an air supply unit attached to the air conditioner and blowing the supply air generated by the air conditioner into the air-conditioned space; A duct unit, Equipped with The air conditioner is a heat exchanger for adjusting the temperature of the outside air and the return air; an air supply fan provided downstream of the heat exchanger and configured to send the outside air and the return air to the air supply unit; a housing that houses the heat exchanger and the air supply fan; and The duct unit includes: A return air duct that introduces the return air to the upstream side of the heat exchanger of the air conditioner; an outside air duct that introduces the outside air to an upstream side of the heat exchanger of the air conditioner; a return air bypass duct that introduces the return air downstream of the heat exchanger; an outside air bypass duct that introduces the outside air to a downstream side of the heat exchanger; A first damper provided in the return air bypass duct; a second damper provided in the outside air bypass duct; and The return air duct, the outside air duct, the return air bypass duct, and the outside air bypass duct each extend in the vertical direction and are arranged in parallel, The air conditioner, the air supply unit, and the duct unit are integrated together. Air conditioning unit.

7. An air conditioning unit installed on the floor within an air-conditioned space, a packaged air conditioner that takes in at least one of return air from within the air-conditioned space and outside air from outside the air-conditioned space to produce supply air; an air supply unit attached to the air conditioner and blowing the supply air produced by the air conditioner into the air-conditioned space; Equipped with The air conditioner is a heat exchanger for adjusting the temperatures of the outside air and the return air; a housing that houses the heat exchanger; and The housing includes: a return air bypass inlet for introducing the return air into a first region downstream of the heat exchanger inside the housing; an outside air bypass inlet for introducing the outside air into the first area; a return air inlet for introducing the return air into a second region upstream of the heat exchanger inside the housing; an outside air intake port for introducing the outside air into the second area; having Air conditioning unit.

8. An air conditioning method using an air conditioning unit installed on the floor of an air-conditioned space, comprising: A packaged air conditioner takes in at least one of return air from within the air-conditioned space and outside air from outside the air-conditioned space to create supply air; an air supply unit attached to the air conditioner blowing the supply air into the air-conditioned space; and The air conditioner is a heat exchanger for adjusting the temperatures of the outside air and the return air; an air supply fan provided downstream of the heat exchanger and configured to send the outside air and the return air to the air supply unit; a housing that houses the heat exchanger and the air supply fan; and The housing includes: a return air bypass inlet for introducing the return air into a first region between the heat exchanger and the supply air fan inside the housing; an outside air bypass inlet for introducing the outside air into the first area; a return air inlet for introducing the return air into a second region upstream of the heat exchanger inside the housing; an outside air intake port for introducing the outside air into the second area; having Air conditioning method.

9. An air conditioning method using an air conditioning unit installed on the floor of an air-conditioned space, comprising: The air conditioning unit is a packaged air conditioner that takes in at least one of return air from within the air-conditioned space and outside air from outside the air-conditioned space to produce supply air; an air supply unit attached to the air conditioner and blowing the supply air produced by the air conditioner into the air-conditioned space; A duct unit, Equipped with The air conditioner is a heat exchanger for adjusting the temperatures of the outside air and the return air; an air supply fan provided downstream of the heat exchanger and configured to send the outside air and the return air to the air supply unit; a housing that houses the heat exchanger and the air supply fan; and The duct unit includes: A return air duct that introduces the return air upstream of the heat exchanger; an outside air duct that introduces the outside air upstream of the heat exchanger; A return air bypass duct that introduces the return air downstream of the heat exchanger; an outside air bypass duct that introduces the outside air downstream of the heat exchanger; A first damper provided in the return air bypass duct; a second damper provided in the outside air bypass duct; and controlling the first damper and the second damper so as to introduce the outside air into the air conditioner from the outside air duct and the outside air bypass duct to perform cooling or heating in an all outside air mode; Controlling the first damper and the second damper so that the return air is introduced into the air conditioner from at least one of the return air duct and the return air bypass duct, and the outside air is introduced into the air conditioner from the outside air duct to perform cooling or heating in an air conditioning mode; The air conditioner takes in at least one of the return air and the outside air to create the supply air, and the air supply unit blows the supply air into the air-conditioned space; having Air conditioning method.

10. An air conditioning method using an air conditioning unit installed on the floor of an air-conditioned space, comprising: A packaged air conditioner takes in at least one of return air from within the air-conditioned space and outside air from outside the air-conditioned space to create supply air; an air supply unit attached to the air conditioner blowing the supply air into the air-conditioned space; and The air conditioner is a heat exchanger for adjusting the temperatures of the outside air and the return air; a housing that houses the heat exchanger; and The housing includes: a return air bypass inlet for introducing the return air into a first region downstream of the heat exchanger inside the housing; an outside air bypass inlet for introducing the outside air into the first area; a return air inlet for introducing the return air into a second region upstream of the heat exchanger inside the housing; an outside air intake port for introducing the outside air into the second area; having Air conditioning method.

Images