CN111512095B

CN111512095B - Air conditioning unit and air conditioning system

Info

Publication number: CN111512095B
Application number: CN201880084082.9A
Authority: CN
Inventors: 山本昌由; 奥田则之; 福冈基彦; 鎌田正史; 渕上博; 辻坚志
Original assignee: Daikin Industries Ltd
Current assignee: Daikin Industries Ltd
Priority date: 2017-12-25
Filing date: 2018-12-21
Publication date: 2021-08-03
Anticipated expiration: 2038-12-21
Also published as: EP3734179A1; EP3734179B1; ES2933523T3; CN111512095A; JP6789205B2; US20200363076A1; JP2019113257A; WO2019131513A1; EP3734179A4

Abstract

An air conditioning unit (12A) for blowing out temperature-conditioned air toward the front side in a room is provided with a utilization-side fan (55), a housing (60), and a second air duct forming member (72). The cross-sectional shape of the air duct (FS1) of the second air duct forming member (72) is circular. The housing (60) is rectangular when viewed from the front. The quadrangle is a quadrangle surrounded by a first side (S61) and a second side (S62) parallel to each other, and a third side (S63) and a fourth side (S64) parallel to each other. In the air conditioning unit (12A), the height dimension (H), which is the smaller of the distance between the first side (S61) and the second side (S62), that is, the height dimension (H), and the distance between the third side (S63) and the fourth side (S64), that is, the width dimension (W), is 2.5 times or less the diameter (D) of the cross section of the air duct (FS 1).

Description

Air conditioning unit and air conditioning system

Technical Field

The present invention relates to an air conditioning unit that blows air with its temperature adjusted to the front side indoors.

Background

Currently, there is an air conditioning unit that is quadrilateral in shape when viewed from the front.

For example, an indoor unit disclosed in patent document 1 (japanese patent application laid-open No. 2017-146011) includes a square box-shaped casing, and blows out air after heat exchange toward the front. Further, patent document 1 (japanese patent application laid-open No. 2017-146011) discloses a structure in which four indoor units are arranged.

Disclosure of Invention

Technical problem to be solved by the invention

In an air conditioning unit disposed indoors, it is sometimes necessary to let the blown air reach a remote place.

Technical scheme for solving technical problem

An air conditioning unit according to a first aspect is an air conditioning unit that blows air that has been temperature-conditioned to the front side indoors. The air conditioning unit includes a fan, a casing, and an air duct forming member. The housing accommodates the fan. The air duct forming member is disposed on the downstream side of the air flow of the fan. The cross-sectional shape of the air duct forming member is circular. Further, the housing is quadrangular when viewed from the front. The quadrangle is a quadrangle enclosed by a first side and a second side which are parallel to each other and a third side and a fourth side which are parallel to each other. In the air conditioning unit, a smaller distance of a first distance, which is a distance between the first side and the second side, and a second distance, which is a distance between the third side and the fourth side, is 2.5 times or less a diameter of a cross section of the air duct.

As described above, in this air conditioning unit, the ratio of the smaller of the first distance and the second distance to the diameter of the cross section of the air duct is smaller than in the conventional air conditioning unit. Thus, for example, where the first distance is less than the second distance, the first distance is limited to a short distance of 2.5 times or less the diameter of the cross-section of the wind tunnel. In this case, if a plurality of air conditioning units are arranged in a direction in which the third side and the fourth side extend, the distance between the air duct of the first air conditioning unit and the air duct of the second air conditioning unit adjacent to each other when viewed from the front is shortened. In this way, the air blown out from the air passages respectively serves to reduce the resistance to the flow of the air, and the air blown out from each air passage can reach a remote place.

In the air conditioning unit according to the second aspect, the smaller of the first distance and the second distance is 2.0 times or less the diameter of the cross section of the air duct.

Here, for example, when the first distance is smaller than the second distance, the first distance is limited to a distance of 2.0 times or less the diameter of the cross section of the air duct, and the distance is considerably shorter than the conventional distance. Therefore, in the case where a plurality of air conditioning units are arranged in the direction in which the third and fourth sides extend, the air blown out from each air duct can reach a very distant position.

The air conditioning unit of the third aspect further includes a drain pan that receives dew condensation water generated in the casing, on the basis of the air conditioning unit of the first or second aspect. The drain pan is disposed at a lower portion of the inner space of the housing. The first and second edges of the housing extend in a horizontal direction. The third and fourth sides of the housing extend in the vertical direction. Further, a first distance constituting a height dimension of the housing is smaller than a second distance constituting a width dimension of the housing.

Here, in the air conditioning unit in which the height dimension (first distance) of the casing is smaller than the width dimension (second distance), the drain pan is disposed at the lower portion of the internal space of the casing. In the air conditioning unit including the above drain pan, conventionally, the height dimension (first distance) of the housing has never been designed to be a short distance of 2.5 times or less the diameter of the cross section of the air passage. That is, the design in which the diameter of the cross section of the air duct is 40% or more of the height dimension (first distance) of the housing is not simple when the arrangement of the drain pan and the like is considered, and has never been thought before. However, in the air conditioning unit according to the third aspect, since the height dimension (first distance) of the casing is limited to be small with respect to the diameter of the cross section of the air duct, the above-described effect of blowing air to reach a distance can be obtained.

The air conditioning system of the fourth aspect is an air conditioning system in which the first air conditioning unit and the second air conditioning unit are arranged in the first direction. The first air conditioning unit is the air conditioning unit according to any one of the first to third aspects. The second air conditioning unit is also the air conditioning unit according to any one of the first to third aspects. The center of the air duct of the first air conditioning unit, i.e., the first air duct, is spaced apart from the center of the air duct of the second air conditioning unit, i.e., the second air duct, by a third distance in the first direction. The third distance is less than 2.5 times the diameter of the cross section of the air duct.

Here, since the air conditioning unit described in any one of the first to third aspects is employed as both the first air conditioning unit and the second air conditioning unit, the third distance can be limited to 2.5 times or less the diameter of the cross section of the air duct. Further, since the third distance, which is the distance between the center of the first air path and the center of the second air path, is 2.5 times or less the diameter of the cross section of the air path and is relatively short, the air blown out from each of the two air paths acts to reduce the resistance to the flow of the air. Accordingly, in the air conditioning system according to the fourth aspect, the air blown out from the first air path is better than the air conditioning system of the related art, and the air blown out from the second air path is also better, and both reach a distance.

The air conditioning system according to the fifth aspect is the air conditioning system according to the fourth aspect, further comprising a support member. The support member is disposed between the first air conditioning unit and the second air conditioning unit. The support member supports the first air conditioning unit and/or the second air conditioning unit. The dimension of the support member along the first direction is less than or equal to one-half of the diameter of the cross section of the air duct.

Here, as a member for supporting the first air conditioning unit and/or the second air conditioning unit, a support member is used. Further, since the dimension of the support member in the first direction is reduced, the center of the first air passage can be brought close to the center of the second air passage. As a result, the third distance is shortened, and the air blown out from the first air passage and the second air passage easily reaches a distance.

Drawings

Fig. 1 is a diagram showing a refrigerant piping system of an air conditioning system.

Fig. 2 is a diagram of a part of the internal structure of the air conditioning unit on the utilization side as viewed obliquely from the rear.

Fig. 3 is a front view of the air conditioning unit.

Fig. 4 is a side view of an air conditioning unit.

Fig. 5 is a diagram of a state in which two air conditioning units are arranged in the vertical direction.

Fig. 6 is a diagram showing a unit interval when two air conditioning units are arranged in the vertical direction.

Fig. 7 is a diagram showing the result of fluid analysis when the usage-side fan is rotated.

Fig. 8 is a diagram showing a flow state (wind speed distribution, turbulent energy) at the outlet surface in the result of the fluid analysis in fig. 7.

Fig. 9 is a diagram of another analysis result of inputting the flow state of fig. 8 into the blowout boundary surface.

Fig. 10 is a diagram showing an analysis result of the maximum distance (the arrival distance at a wind speed of 1m/s or more) at which the blown air flows at a predetermined wind speed when two air conditioning units that are far apart are operated.

Fig. 11 is a diagram showing an analysis result of the maximum distance (the arrival distance at a wind speed of 1m/s or more) at which the blown air flows at a predetermined wind speed when two air conditioning units arranged close to each other are operated.

Fig. 12 is a diagram showing an analysis result of the maximum distance (the arrival distance at a wind speed of 1m/s or more) at which the blown air flows at a predetermined wind speed when two air conditioning units arranged adjacent to each other are operated.

FIG. 13 is a graph showing the relationship between the arrival distance at a wind speed of 1m/s or more, the inter-air-passage distance, and the diameter of the air passage.

Fig. 14 is a diagram showing the analysis result of the farthest distance (the arrival distance at a wind speed of 1m/s or more) of the air flow blown at a predetermined wind speed when four air conditioning units are arranged adjacent to each other in the modification.

Detailed Description

(1) Integral structure of air conditioning system

Fig. 1 is a diagram showing a refrigerant piping system of an air conditioning system 10. The air conditioning system 10 is a distributed air conditioning apparatus of a refrigerant piping system, and performs a vapor compression refrigeration cycle operation to cool and heat the interior of a building.

The air conditioning system 10 is installed mainly in a factory to locally cool or heat a space in an open building such as a factory. The air conditioning system 10 includes a heat source unit 11 provided outside the plant, a plurality of

air conditioning units

12A, 12B, … … provided in the plant, a liquid refrigerant communication tube 13 connecting the heat source unit 11 and the

air conditioning units

12A, 12B, … …, and a gas refrigerant communication tube 14. That is, the refrigerant circuit of the air-conditioning system 10 shown in fig. 1 is configured such that the heat source-side unit 11, the usage-side air-

conditioning units

12A, 12B, and … …, and the refrigerant communication tubes 13 and 14 are connected together.

The

air conditioning units

12A, 12B, … … may be located on the floor, suspended from beams in the ceiling, or supported on posts within the plant. The

air conditioning units

12A, 12B, and … … are each connected to a remote controller, not shown, and can change the set temperature and the air volume in multiple stages. Further, the

air conditioning units

12A, 12B, … … can be independently turned on and off.

A refrigerant is sealed in the refrigerant circuit shown in fig. 1, and a refrigeration cycle operation is performed in which the refrigerant is compressed, cooled and condensed, decompressed, heated and evaporated, and then compressed again, as will be described later.

(2) Structure of each part of air conditioning system

(2-1) Heat Source Unit

The heat source unit 11 mainly includes a compressor 20, a four-way selector valve 15, a heat-source-side heat exchanger 30, a heat-source-side expansion valve 41, a liquid-side shutoff valve 17, and a gas-side shutoff valve 18.

The compressor 20 is a hermetic compressor driven by a compressor motor. The compressor 20 sucks a gas refrigerant from the suction flow path 27.

The four-way switching valve 15 is a mechanism for switching the flow direction of the refrigerant. During the cooling operation, the four-way selector valve 15 connects the refrigerant pipe 29 on the discharge side of the compressor 20 to one end of the heat source side heat exchanger 30, and connects the suction flow path 27 on the suction side of the compressor 20 to the gas side shutoff valve 18 (see the solid lines of the four-way selector valve 15 in fig. 1). Thus, the heat source side heat exchanger 30 functions as a condenser for the refrigerant compressed by the compressor 20, and the usage side heat exchanger 50, which will be described later, functions as an evaporator for the refrigerant condensed in the heat source side heat exchanger 30. In the heating operation, the four-way selector valve 15 connects the refrigerant pipe 29 on the discharge side of the compressor 20 to the gas-side shutoff valve 18, and connects the intake passage 27 to one end of the heat source-side heat exchanger 30 (see the broken line of the four-way selector valve 15 in fig. 1). Thus, the use side heat exchanger 50 functions as a condenser for the refrigerant compressed by the compressor 20, and the heat source side heat exchanger 30 functions as an evaporator for the refrigerant cooled in the use side heat exchanger 50.

The heat source side heat exchanger 30 is a heat exchanger that functions as a condenser or an evaporator of the refrigerant. One end of the heat source side heat exchanger 30 is connected to the four-way selector valve 15, and the other end thereof is connected to the heat source side expansion valve 41.

The heat source unit 11 includes a heat source-side fan 35, and the heat source-side fan 35 is configured to draw outside air into the unit and discharge the air to the outside again.

The heat-source-side expansion valve 41 is an expansion mechanism for decompressing the refrigerant, and is an electronic expansion valve whose opening degree can be adjusted. One end of the heat-source-side expansion valve 41 is connected to the heat-source-side heat exchanger 30, and the other end thereof is connected to the liquid-side shutoff valve 17.

The liquid-side shutoff valve 17 is a valve to which the liquid refrigerant communication tube 13 is connected. The gas-side shutoff valve 18 is a valve connected to the gas refrigerant communication tube 14, and is also connected to the four-way selector valve 15.

(2-2) air-conditioning Unit on utilization side

The air-

conditioning units

12A, 12B, and … … are connected to the heat source unit 11 via the refrigerant communication tubes 13 and 14, respectively. The

air conditioning units

12A, 12B, … … each have identical external shapes and internal configurations. Here, referring to fig. 1 to 4, an air conditioning unit 12A will be described as an example.

The air conditioning unit 12A includes a liquid refrigerant pipe 51, a usage-side expansion valve 42 as a decompressor, a usage-side heat exchanger 50, a gas refrigerant pipe 52, a usage-side fan 55, and the like.

The usage-side expansion valve 42 is an expansion mechanism for decompressing the refrigerant, and is an electronic expansion valve capable of opening degree adjustment. One end of the usage-side expansion valve 42 is connected to the liquid refrigerant communication tube 13 via a liquid refrigerant pipe 51, and the other end thereof is connected to the usage-side heat exchanger 50.

The utilization-side heat exchanger 50 is a heat exchanger that functions as an evaporator or a condenser of the refrigerant. One end of the usage-side heat exchanger 50 is connected to the usage-side expansion valve 42, and the other end thereof is connected to the gas refrigerant communication tube 14 via a gas refrigerant pipe 52.

The air conditioning unit 12A includes a usage-side fan 55, and the usage-side fan 55 is configured to suck indoor air into the unit and supply the indoor air to the room again, and the air conditioning unit 12A exchanges heat between the indoor air and the refrigerant flowing through the usage-side heat exchanger 50.

(2-3) refrigerant connection pipe

The refrigerant communication tubes 13, 14 are refrigerant tubes that are constructed on site when the heat source unit 11 and the

air conditioning units

12A, 12B, … … are installed at installation locations inside and outside a factory. When the

air conditioning units

12A, 12B, and … … on the use side are installed, they are installed directly on the floor or the floor of a factory, suspended from a ceiling beam to connect an extended duct to a blow-out port, or a plurality of the

air conditioning units

12A, 12B, and … … on the use side are arranged in the vertical direction and installed on a column. With the installation of these

air conditioning units

12A, 12B, … …, the refrigerant communication tubes 13, 14 are also arranged along the underfloor, ceiling, or column.

Further, if manual valves are provided in advance between the refrigerant communication tubes 13, 14 and the air-

conditioning units

12A, 12B, … …, it becomes easier to add air-conditioning units and move air-conditioning units thereafter.

In this air conditioning system 10, several tens of

air conditioning units

12A, 12B, and … … can be connected to the heat source unit 11, and the length of the refrigerant communication tubes 13 and 14 can be 150m at maximum.

(3) Operation of air conditioning system

Next, the operation of the air conditioning system 100 will be described.

(3-1) operation of Cooling operation

During the cooling operation, the four-way selector valve 15 is in the state shown by the solid line in fig. 1, that is, the discharge gas refrigerant from the compressor 20 flows through the heat source side heat exchanger 30, and the suction flow path 27 is connected to the gas side shutoff valve 18. The heat-source-side expansion valve 41 is in a fully open state, and the opening degree of the usage-side expansion valve 42 is adjusted. In addition, the shutoff valves 17, 18 are in an open state.

In this state of the refrigerant circuit, the high-pressure gas refrigerant discharged from the compressor 20 is sent to the heat source side heat exchanger 30 functioning as a condenser of the refrigerant via the four-way selector valve 15, exchanges heat with the outside air supplied by the heat source side fan 35, and is cooled. The high-pressure refrigerant cooled and liquefied in the heat source side heat exchanger 30 is sent to each

air conditioning unit

12A, 12B, … … via the liquid refrigerant communication tube 13. The refrigerant sent to each of the

air conditioning units

12A, 12B, and … … is depressurized by the usage-side expansion valve 42 to become a low-pressure gas-liquid two-phase refrigerant, and then exchanges heat with indoor air in the usage-side heat exchanger 50 functioning as an evaporator of the refrigerant to be evaporated into a low-pressure gas refrigerant. Next, the low-pressure gas refrigerant heated in the usage-side heat exchanger 50 is sent to the heat source unit 11 via the gas refrigerant communication tube 14, and is again drawn into the compressor 20 via the four-way selector valve 15. As described above, the cooling in the factory (indoor) is performed.

When only some of the

air conditioning units

12A, 12B, and … … are operating, the usage-side expansion valve 42 is set to the stop opening degree for the stopped air conditioning unit. In this case, the refrigerant does not substantially pass through the air conditioning unit that is not in operation, and only the air conditioning unit that is in operation performs the cooling operation.

(3-2) operation of heating operation

During the heating operation, the four-way selector valve 15 is in a state shown by the broken lines in fig. 1, that is, in a state in which the refrigerant pipe 29 on the discharge side of the compressor 20 is connected to the gas-side shutoff valve 18 and the intake passage 27 is connected to the heat source-side heat exchanger 30. The opening degrees of the heat source-side expansion valve 41 and the usage-side expansion valve 42 are adjusted. In addition, the shutoff valves 17, 18 are in an open state.

In this state of the refrigerant circuit, the high-pressure gas refrigerant discharged from the compressor 20 is sent to the air-

conditioning units

12A, 12B, and … … via the four-way selector valve 15 and the gas refrigerant communication tube 14. Then, the high-pressure gas refrigerant sent to each of the air-

conditioning units

12A, 12B, and … … exchanges heat with indoor air in each of the usage-side heat exchangers 50 functioning as condensers for the refrigerant and is cooled, and then the refrigerant passes through the usage-side expansion valve 42 and is sent to the heat source unit 11 via the liquid refrigerant communication tube 13. When the refrigerant exchanges heat with indoor air and is cooled, the indoor air is heated. The high-pressure refrigerant sent to the heat source unit 11 is depressurized by the heat-source-side expansion valve 41 to become a low-pressure gas-liquid two-phase refrigerant, and flows into the heat-source-side heat exchanger 30 functioning as an evaporator of the refrigerant. The low-pressure gas-liquid two-phase refrigerant flowing into the heat source side heat exchanger 30 is heated and evaporated into a low-pressure refrigerant by heat exchange with the outside air supplied by the heat source side fan 35. The low-pressure gas refrigerant leaving the heat source side heat exchanger 30 is again sucked into the compressor 20 through the four-way selector valve 15. Heating in a factory (indoor) is performed as described above.

(4) Details of construction of air conditioning units using sides

Next, details of the

air conditioning units

12A, 12B, and … … on the use side will be described. As described above, since the air conditioning units have the same external shape and the same internal structure, the air conditioning unit 12A will be described as an example.

The air conditioning unit 12A is a unit that blows air whose temperature has been adjusted to the front side indoors. The air conditioning unit 12A includes the first air passage forming member 71 and the second air passage forming member 72, the drain pan 59, the housing 60, and the like, in addition to the liquid refrigerant pipe 51, the usage-side expansion valve 42 as a decompressor, the usage-side heat exchanger 50, the gas refrigerant pipe 52, and the usage-side fan 55. Fig. 2 is a diagram of a part of the internal structure of the air conditioning unit 12A as viewed from diagonally behind. In fig. 2, most of the electrical component box, the usage-side expansion valve 42, the liquid refrigerant pipe 51, and the gas refrigerant pipe 52 are not shown in order to make it easy to observe other internal structures. In fig. 2, for example, a portion of the first air passage forming member 71 covering the periphery of the fan blades 55b is not shown, and only a portion of the front surface side of the first air passage forming member 71 is shown, for convenience of understanding.

(4-1) utilization-side Heat exchanger and utilization-side Fan

As shown in fig. 2, the use side heat exchanger 50 is disposed on the back side in the casing 60. The right side of fig. 2 is the front side, and the left side is the back side. The usage-side fan 55 is located in front of the usage-side heat exchanger 50. The utilization-side fan 55 includes a motor 55a having a rotation shaft extending in the front-rear direction and fan blades 55b located in front of the motor 55 a. When the fan blades 55b rotate, air is drawn in from the opening on the back surface of the housing 60, and the air flows from the back surface side to the front surface side of the use side heat exchanger 50. The air that has passed through the use side heat exchanger 50 is blown out to the front side of the casing 60 through the blow-out port 66 located on the front side of the use side fan 55.

(4-2) first and second air duct forming members

The first air passage forming member 71 and the second air passage forming member 72 are both cylindrical members. The first air passage forming member 71 is located inside the casing 60 and covers the periphery of the fan blades 55 b. As shown in fig. 3 and 4, the second air passage forming member 72 is located outside the casing 60, and guides the air blown out from the air outlet 66 forward. The second air passage forming member 72 is disposed on the downstream side of the airflow of the utilization-side fan 55. The first air passage forming member 71 and the second air passage forming member 72 have the same inner diameter ID. The first air passage forming member 71 and the second air passage forming member 72 have a cylindrical air passage FS1 formed on the front side of the fan blades 55 b. The diameter D of the air duct FS1 is equal to the inner diameters ID of the first air duct forming member 71 and the second air duct forming member 72 (see fig. 3).

Here, the diameter of the cross section of the second air passage forming member 72 located on the downstream side of the fan blades 55b with respect to the air flow is constant. However, the diameter of the cross section of the second air passage forming member 72 may be reduced toward the front end. However, in this case, since the diameter of the cross section of the front end portion of the air duct FS1 is reduced, it is not easy to satisfy the condition of the ratio to the height H of the housing 60 described later.

(4-3) Drain tray

As shown in fig. 2, the drain pan 59 is disposed at a lower portion in the housing 60. The drain pan 59 is located below the use side heat exchanger 50, the liquid refrigerant pipe 51, the gas refrigerant pipe 52, the use side fan 55, the first air passage forming member 71, and the like, and receives dew condensation water generated in the casing 60. During the cooling operation, even if dew condensation occurs on the surfaces of the use side heat exchanger 50 and the liquid refrigerant pipe 51, the dew condensation water is received by the drain pan 59.

(4-4) outer case

The square box-shaped housing 60 mainly includes a top plate 61, a bottom plate 62, a left side plate 63, a right side plate 64, and a front plate 65. No steel plate is present on the back surface of the casing 60, and the back surface of the use side heat exchanger 50 is exposed. A circular air outlet 66 is formed in the center of the front panel 65. A plurality of baffle plates are disposed in the outlet 66. The diameter of the air outlet 66 is equal to the inner diameters ID of the first air passage forming member 71 and the second air passage forming member 72.

As shown in fig. 3, the housing 60 has a quadrangular shape when viewed from the front. The upper side, i.e., the first side S61, and the lower side, i.e., the second side S62, of the quadrangular housing 60 extend in the horizontal direction. The left, third side S63 and the right, fourth side S64 of the rectangular case 60 extend in the vertical direction (vertical direction). The first side S61 and the second side S62 are parallel to each other. The third side S63 and the fourth side S64 are parallel to each other. As can be seen by comparing the height dimension H, which is the distance between the first side S61 and the second side S62 (first distance), and the width dimension W, which is the distance between the third side S63 and the fourth side S64 (second distance), in the air conditioning unit 12A, the height dimension H is smaller than the width dimension W. Specifically, the height dimension H is 455mm, and the width dimension W is 555 mm.

Further, the height dimension H, which is the smaller of the height dimension H and the width dimension W of the quadrangle of the housing 60 when viewed from the front, is limited to 2.5 times or less the diameter D of the air duct FS 1. By designing the casing 60 as described above, an effect relating to the reach of the blown air when two

air conditioning units

12A and 12B are arranged can be obtained as described later.

As will be described later, the arrangement of the components in the housing 60 is preferably examined, and the smaller of the height H and width W of the housing 60 is set to 2 times or less the diameter of the air duct FS 1. In the air conditioning unit 12A of the present embodiment, the diameter D of the air duct FS1, that is, the inner diameter ID of the first air duct forming member 71 and the second air duct forming member 72 is 320 mm. Therefore, the height dimension H (455mm) of the housing 60 is controlled to a dimension 1.5 times or less the diameter (320mm) of the air duct FS 1.

In this way, in the air conditioning unit 12A of the present embodiment, the ratio of the height dimension H of the casing 60 to the diameter D of the air duct FS1 is made to be a very small value, which has not been achieved before.

(5) Distance of arrival of blown air flow when a plurality of air conditioning units are arranged close to each other

Fig. 5 and 6 show a state in which two

air conditioning units

12A and 12B are arranged in the vertical direction D1. As described above, the air conditioning unit 12A and the air conditioning unit 12B have the identical configuration. The air conditioning unit 12A is disposed directly above the air conditioning unit 12B, and a gap having a height of 85mm is provided between the air conditioning unit 12A and the air conditioning unit 12B. A support member 81 is disposed at the gap. The support member 81 supports the first air conditioning unit 12A or the second air conditioning unit 12B, respectively. One end of the support member 81 is fixed to the column 80. The height dimension L1 of the support member 81 is 80 mm. The support member 81 is selected such that the following relationship is established between the height dimension L1(80mm) of the support member 81 and the diameter (320mm) of the air duct FS1 of each

air conditioning unit

12A, 12B:

the height dimension L1 < (diameter of the air duct FS1) × 0.5 of the support member 81. Here, since the strength is sufficient, the number of the support members 81 is two and the height L1 of the support members 81 is 80mm for each of the

air conditioning units

12A and 12B.

As shown in fig. 6, when two

air conditioning units

12A and 12B are arranged in the vertical direction and the height of the gap between the two air conditioning units is set to 85mm, the center C1 of the first air conditioning unit 12A, i.e., the first air duct FS1, and the center C2 of the second air conditioning unit 12B, i.e., the second air duct FS2, are separated by a third distance L3 in the vertical direction D1. The third distance L3 is 2.5 times or less the diameter (320mm) of the cross section of each of the air ducts FS1 and FS 2. Here, the third distance L3 is 540mm, which is about 1.7 times the diameter (320mm) of the cross section of each of the air ducts FS1 and FS 2.

By suppressing the ratio of the third distance L3 to the diameter D of the cross section of each of the air paths FS1 and FS2 to be small, an effect on the reach of the blown air described later can be obtained.

(6) Reach distance of blown air when two air conditioning units are arranged

Next, the reach of the blown air when two

air conditioning units

12A and 12B are arranged in the vertical direction will be described with reference to fig. 7 to 13. Here, the results of the air flow analysis are compared with the results of measurement using an actual machine, and verified, and the air flow analysis model obtained thereby is used to obtain a finding about the arrival distance of the blown air. This finding will be explained below.

(6-1) adjustment of flow analysis parameters based on wind speed measurement

First, two

air conditioning units

12A and 12B are stacked in the vertical direction, that is, two

air conditioning units

12A and 12B are disposed without a gap, and wind speed is measured at 1120 points using a wind speed measuring device. The fan speed was 1646 times/min and the air flow was about 18 cubic meters/min. In addition, the same wind speed measurement was also performed for the case of only one air conditioning unit 12A.

Next, the same fan rotational speed and the same air volume are input, and an air flow analysis is performed for the individual air conditioning unit 12A (see fig. 7), and a time-averaged flow state (wind speed distribution, turbulent energy) of one rotation of the fan at the outlet face is obtained (see fig. 8). The flow state thus obtained was input to the blowout boundary surface, and another flow analysis was performed (see fig. 9). As in the experiment using the wind speed measuring device, the above-described flow analysis was also performed for the case where one unit was provided and the case where two units were provided so as to overlap each other in the vertical direction.

Next, the wind speed at each point obtained by the airflow analysis was compared with the measurement results of the experiment using the wind speed measuring device, and the measurement results were investigated, and the parameter adjustment of the airflow analysis was performed.

(6-2) relationship between relative distance of two air conditioning units and arrival distance of blown air

Next, the gap size between the two

air conditioning units

12A and 12B arranged in the vertical direction is changed, and the airflow analysis is repeated. Fig. 10 to 12 show an example thereof.

Fig. 10 shows the analysis result when two

air conditioning units

12A and 12B that are far apart are operated with the gap size of 2 m. When the gap size is 2m, the third distance L3, which is the distance between the center C1 of the first air path FS1 and the center C2 of the second air path FS2, is 2455mm, and a value obtained by dividing this value by the diameter (320mm) of the air paths FS1 and FS2 is 7.7. Here, as in the case of operating one air conditioner alone, the region where the wind speed is 1m/s or more ends at a point 4m away from each of the

air conditioning units

12A and 12B. That is, wind with a wind speed of 1m/s can reach a position 4m from each

air conditioning unit

12A, 12B, however, at more distant areas, the wind speed will be less than 1 m/s. Here, the above 4m is referred to as an arrival distance at which the blown air reaches a wind speed of 1 m/s.

Fig. 11 shows the analysis result when two

air conditioning units

12A and 12B arranged relatively close to each other are operated with the gap size of 500 mm. When the gap size is 500mm, the third distance L3, which is the distance between the center C1 of the first air path FS1 and the center C2 of the second air path FS2, is 955mm, and a value obtained by dividing the value by the diameter (320mm) of the air paths FS1 and FS2 is 3.0. In this case, the distance of arrival of the blown air at a wind speed of 1m/s was extended to 6.7 m.

Fig. 12 shows an analysis result in the case where two

air conditioning units

12A and 12B arranged adjacent to each other are operated with the gap size set to 0 mm. When the gap size is set to 0mm, the third distance L3, which is the distance between the center C1 of the first air path FS1 and the center C2 of the second air path FS2, is 455mm, and the value obtained by dividing the value by the diameter (320mm) of the air path is 1.4. In this case, the distance of arrival of the blown air at a wind speed of 1m/s was extended to 7.3 m.

In addition to the conditions shown in fig. 10 to 12, the air flow analysis was performed by repeatedly changing parameters such as the gap size, and as a result, a graph relating to the arrival distance at the air speed 1m/s of the blown air shown in fig. 13 was obtained. As can be seen from fig. 13, arranging the two

air conditioning units

12A, 12B so as to be not far apart so that the value obtained by dividing the third distance L3 by the diameter D of the ducts FS1, FS2 is as small as possible will extend the reach distance of the blown air at the wind speed of 1 m/s. As is apparent from fig. 13, the third distance L3 is set to 2.5 times or less, and preferably 2.0 times or less, the diameter D of the air paths FS1 and FS2, whereby the reaching distance of the wind speed 1m/s of the blown air can be sufficiently extended.

In order to set the value (L3/D) obtained by dividing the third distance L3 by the diameter D of the ducts FS1, FS2 to 2.5 or less, when two

air conditioning units

12A, 12B are arranged in the vertical direction, the following relational expression must be satisfied even if the air conditioning units are arranged without a gap:

the height dimension H < (the diameter of the air duct FS1) × 2.5 of the housing 60.

This is because, when the

air conditioning units

12A and 12B are arranged in the vertical direction without a gap, the third distance is equal to the height dimension H of the casing 60. Conversely, in the case of an air conditioning unit in which the height dimension H of the housing 60 is > (the diameter of the air duct FS1) × 2.5, even if two air conditioning units are stacked without a gap in the vertical direction, the distance between the upper air duct and the lower air duct is relatively long, and the reaching distance of the air speed of the blown air of 1m/s cannot be sufficiently extended.

(7) Air conditioning unit and features of air conditioning system

(7-1)

The air conditioning unit 12A is designed in the following manner: the ratio of the smaller distance (here, the height H) of the height H and the width W of the housing 60 when viewed from the front to the diameter D of the cross section of the air duct FS1 is smaller than in the conventional case. Specifically, the height dimension H is limited to a short dimension of 2.5 times or less the diameter D of the cross section of the air duct FS 1. Therefore, when two

air conditioning units

12A and 12B are arranged in the vertical direction D1, the distance between the first air duct FS1 of the adjacent first air conditioning unit 12A and the second air duct FS2 of the adjacent second air conditioning unit 12B when viewed from the front is shortened (see fig. 6). In this way, the air blown out from the air passages FS1 and FS2 serve to reduce the resistance to the flow of air, and the air blown out from the air passages can reach a remote place (see fig. 12).

(7-2)

In the air conditioning unit 12A, a casing 60 having a height dimension H smaller than a width dimension W is used, and as shown in fig. 2, a thin drain pan 59 is disposed at a lower portion in the casing 60. Further, the arrangement of the usage-side heat exchanger 50 and the electrical component box is studied to design the inside diameters ID of the usage-side fan 55 and the first air duct forming member 71 and the second air duct forming member 72 to be as large as possible, and to make the diameter D of the cross section of the air duct FS1 as large as possible with respect to the height dimension H of the housing 60.

Thus, even in the air conditioning unit 12A including the drain pan 59, the above-described technical effect of sufficiently extending the reaching distance of the wind speed 1m/s of the blown air can be obtained.

(7-3)

In the air conditioning system 10, as shown in fig. 6, two

air conditioning units

12A and 12B are arranged in the vertical direction D1 with a gap as small as possible. That is, the arrangement space of the support member 81 is secured, and the two

air conditioning units

12A and 12B are not far apart. Specifically, two

air conditioning units

12A and 12B are arranged in the vertical direction with a gap of 85mm in height.

Therefore, the third distance L3, which is the distance between the center C1 of the first air space FS1 of the first air conditioner unit 12A and the center C2 of the second air space FS2 of the second air conditioner unit 12B, is controlled to be 2.5 times or less the diameter D (320mm) of the cross section of each air space FS1, FS 2.

As shown in fig. 6, since the relationship of increasing the diameter D of the first air path FS1 and the second air path FS2 and decreasing the gap between the two

air conditioning units

12A and 12B so that the third distance (inter-air-path distance) L3/the diameter D of the air path becomes 1.7 is established, the air conditioning system 10 can extend the reaching distance of the wind speed 1m/s of the blown air to 7m or more as shown in fig. 13.

(8) Modification example

(8-1)

Fig. 5 and 6 show an example in which two

air conditioning units

12A and 12B are arranged and installed in the vertical direction D1, but three or more

air conditioning units

12A, 12B, and … … may be arranged and installed in the air conditioning system 10. For example, as shown in fig. 14, if four

air conditioning units

12A, 12B, and … … are arranged in the vertical direction so as to be close to each other, the reach distance of the blown air at the wind speed of 1m/s becomes longer.

(8-2)

In the air conditioning system 10, the

air conditioning units

12A, 12B, and … … are arranged in the vertical direction by setting the height dimension H of the air conditioning unit 12A to be smaller than the width dimension W, but the opposite is also possible. That is, the air conditioning units may be arranged in the left-right direction when the air conditioning units are arranged by making the height dimension of the air conditioning units larger than the width dimension. In this case, by satisfying the condition that the width dimension of the housing is < (diameter of air duct) × 2.5, the distance between the air ducts of the plurality of air conditioning units arranged in the left-right direction is reduced, and the blown air can reach a far distance.

(8-3)

While the embodiments of the air conditioning system and the air conditioning unit have been described above, it should be understood that various changes in form and detail may be made therein without departing from the spirit and scope of the air conditioning system and the air conditioning unit as set forth in the following claims.

Description of the symbols

10 air conditioning system

12A first air conditioning unit

12B second air conditioning unit

55 side fan

59 drain pan

60 outer casing

72 air duct forming member

81 support member

S61 first side

S62 second side

S63 third side

Fourth side of S64

H height dimension of the housing (first distance)

W width dimension of the housing (second distance)

Diameter of cross section of D wind channel

FS1 first air duct

FS2 second air duct

Center of C1 first air duct

Center of C2 second air duct

D1 vertical direction (first direction)

Height dimension of L1 support member

L3 distance between centers of two air ducts of the first and second air-conditioning units arranged in the vertical direction (third distance)

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2017-146011.

Claims

1. An air conditioning system (10) comprising:

a first air conditioning unit (12A) that blows air, the temperature of which has been adjusted, out of the room to the front side; and

a second air conditioning unit (12B) that blows air, the temperature of which has been adjusted, out of the room to the front side,

it is characterized in that the preparation method is characterized in that,

the first air conditioning unit and the second air conditioning unit each have:

a fan (55);

a housing (60) that houses the fan; and

an air passage forming member (72) disposed on the downstream side of the fan in the air flow, the air passage (FS1) of the air passage forming member having a circular cross-sectional shape,

the housing is formed in a quadrangular shape surrounded by a first side (S61) and a second side (S62) which are parallel to each other and a third side (S63) and a fourth side (S64) which are parallel to each other when viewed from the front,

the smaller distance of the first distance (H) between the first edge and the second distance (W) between the third edge and the fourth edge is less than or equal to 2.5 times of the diameter (D) of the cross section of the air duct,

the first air conditioning unit and the second air conditioning unit are arranged in a first direction (D1),

the center (C1) of the first air conditioning unit's duct, first duct (FS1), is spaced a third distance (L3) in the first direction from the center (C2) of the second air conditioning unit's duct, second duct (FS2),

the third distance (L3) is less than 2.5 times the diameter (D) of the cross-section of the air chute.

2. The air conditioning system of claim 1,

the smaller of the first distance (H) and the second distance (W) is 2.0 times or less the diameter (D) of the cross-section of the air duct.

3. Air conditioning system according to claim 1 or 2,

the first and second air conditioning units each further having a drain pan (59) that receives dew condensation water generated within the housing,

the drain pan is disposed at a lower portion of the inner space of the housing,

the first edge and the second edge extend in a horizontal direction,

the third side and the fourth side extend in the vertical direction,

the first distance (H) constituting a height dimension of the housing is smaller than the second distance (W) constituting a width dimension of the housing.

4. The air conditioning system of claim 1,

the air conditioning system further comprises a support member (81) which is arranged between the first air conditioning unit and the second air conditioning unit and supports the first air conditioning unit and/or the second air conditioning unit,

a dimension (L1) of the support member along the first direction (D1) is less than one-half of a diameter (D) of a cross section of the wind tunnel (FS1, FS 2).