JP2009127930A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce ventilating resistance of a heat exchanger regardless of an environment and operating time, and to hold down noise. <P>SOLUTION: This air conditioner includes a heat exchanger whose heat transfer pipe is flat in section, wherein a stream lining means for stream lining an air current direction flowing into the heat exchanger 10A is provided on the upstream side of the heat exchanger 10A having the flat heat transfer pipe 12, and the stream lining means is substantially uniform in width or thickness when viewed from the side of the heat exchanger, and installed so that the total of lengths 14 of extension lines 13 of major axes of the flat shapes of the respective flat heat transfer pipes intersecting the stream lining means and passing the stream lining means is minimized. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an air conditioner such as an air conditioner, and more particularly to an improvement of a heat exchanger mounted on the air conditioner.

  An air conditioner such as an air conditioner is generally installed on an indoor wall, sucks indoor airflow from a suction port on the upper side, and discharges it from a blower outlet on the lower side.

  And in such an air conditioner, the heat exchanger is arrange | positioned so that the circumference | surroundings of the air blower which has a some braid | blade may be surrounded. The heat exchanger is composed of heat transfer tubes and heat transfer fins through which refrigerant passes. A dust collecting and air cleaning device or a filter is disposed between the suction port and the heat exchanger as necessary. The airflow flowing in from the suction port passes through the filter, passes through the heat exchanger, exchanges heat, and then is discharged from the outlet by the blower.

  In recent years, air conditioners have been required to save power and be quiet. Especially in small-size air conditioners, the input value of the blower becomes more dominant than the input value of the compressor, so a unit with low aerodynamic load is required. Has been. One solution is low pressure loss focusing on the shape of the heat exchanger tube of the heat exchanger.

  Many of the heat transfer tubes of conventional heat exchangers have a circular tube shape in cross section, but such circular heat transfer tubes have a large flow resistance and increase the load on the blower. Further, since a downstream region having a low flow velocity is generated in the downstream portion of the circular heat transfer tube, the heat transfer performance is deteriorated, and further, the vortex generated in the circular heat transfer tube flows into the downstream fan and generates noise.

  Then, what made flow resistance small by making the cross-sectional shape of a heat exchanger tube into a flat shape, and making the long axis of a flat shape substantially correspond to the airflow direction which flows in into a heat exchanger is proposed (for example, refer patent document 1). .

  In addition, by making the cross-sectional shape of the heat transfer tube flat, when the heat exchanger is used as an evaporator, condensation heat adheres to the tube surface and the heat transfer performance is not deteriorated. There has been proposed a structure in which the heat transfer tube is inclined (see, for example, Patent Document 2).

JP-A-5-79654 (FIG. 1) Japanese Patent Laid-Open No. 11-141904 (FIGS. 5 and 6)

  The path of the airflow sucked into the air conditioner and flowing into the heat exchanger depends on the shape of the box, the environment in which the unit is placed, and the state of the unit. The shape of the box means the space from the suction port to the heat exchanger, and the environment where the unit is placed means that the periphery of the suction port is narrow. Moreover, the state of the unit means that the dust resistance and dust are attached to the air outlet and the airflow resistance changes locally as the air conditioner is used. That is, the airflow path changes with time. Therefore, if the flat heat transfer tube is simply tilted according to the air flow direction as described above, the effect as designed can be expected at the start of use of the unit. The performance changes when the state changes. Further, the flat heat transfer tube has a large aspect ratio, and there is a large difference in resistance depending on the direction of the inflowing air compared to the circular heat transfer tube, so there is a problem that the flow resistance increases and noise increases.

  The technical problem of the present invention is to be able to reduce the ventilation resistance of the heat exchanger and to suppress the noise, regardless of the environment and usage time.

  The air conditioner according to the present invention has the following configuration. That is, one or a plurality of heat exchangers composed of a plurality of heat transfer fins and a plurality of heat transfer tubes penetrating the heat transfer fins are arranged inside the unit so as to surround the blower, and air is sucked from the suction port by the rotation of the blower. An air conditioner that sucks in, passes through a heat exchanger, exchanges heat between the refrigerant and air, and discharges the air from the outlet to the outside of the unit. The air conditioner includes a heat exchanger having a flat cross-sectional shape of the heat transfer tube. On the upstream side of the heat exchanger having a heat transfer tube, a rectifying means for rectifying the direction of airflow flowing into the heat exchanger is provided, and the rectifying means has a substantially constant width or thickness as viewed from the side of the heat exchanger. In addition, the flat extension line of the flat long axis of each flat heat transfer tube intersects with the rectifying means so that the total length passing through the rectifying means is minimized.

  According to the air conditioner of the present invention, the airflow direction is rectified by the rectifying means on the upstream side of the heat exchanger on the flat heat transfer tube side, and the heat exchanger on the flat heat transfer tube side has the long axis direction of the flat shape Airflow parallel to the air enters and the flow resistance decreases. Since this rectification effect is determined by the installation direction of the rectification means having a substantially constant width or thickness as viewed from the side of the heat exchanger, the rectification effect is hardly affected by surrounding environmental changes and usage time. For this reason, an effect lasts.

Embodiment 1 FIG.
The present invention will be described below with reference to illustrated embodiments.
FIG. 1 is a side sectional view showing an air conditioner according to Embodiment 1 of the present invention.

  As for the air conditioner of this embodiment, the once-through fan 5 is arrange | positioned inside a unit, and heat exchanger 6B, 6C, 10A is arrange | positioned at the suction part so that the once-through fan 5 may be enclosed. Among them, the heat exchanger 10A disposed in the lower front portion is composed of a plurality of heat transfer fins 10a and flat heat transfer tubes 12 that pass through the heat transfer fins 10a and pass the refrigerant. Further, on the upstream side of the heat exchanger 10A, a heat exchanger 6A including a plurality of heat transfer fins 6a and a circular heat transfer tube 7 that passes through the heat transfer fins 6a and passes the refrigerant is installed. In the heat exchanger 6A, the width of the heat transfer fins 6a is substantially constant, and the flat long-axis extension line 13 of each flat heat transfer tube 12 intersects the heat transfer fins 6a of the upstream heat exchanger 6A. The direction of the surface facing the heat exchanger 10A is adjusted so that the total of the lengths 14 passing through the heat transfer fins 6a is minimized. The flat heat transfer tube 12 a in the vicinity of the lower portion of the flat heat transfer tube 12 is installed to be inclined so as to face the cross-flow fan 5.

Next, operation | movement of the air conditioner of this embodiment is demonstrated using FIG. 2 thru | or FIG.
2 is a schematic diagram of the air flow inside the air conditioner in the comparative example, FIG. 3 is a schematic diagram of the air flow around the heat exchanger of the air conditioner in the comparative example, and FIG. 4 is a heat exchanger of the air conditioner in the present embodiment. It is a schematic diagram of the surrounding airflow.

  When the cross-sectional shape of the heat transfer tube of the heat exchanger 10A is a flat shape, the airflow 3 flowing into the heat exchanger 10A at the lower front portion enters the heat transfer fins 6a from the direction along the front surface of the heat exchanger 10A. 3 flows along the side surface of the flat heat transfer tube 12. In this case, the airflow 3 hardly passes between the flat heat transfer tubes 12, and peeling occurs depending on the location. In other words, if there is no heat exchanger 6A having a rectifying function upstream, the angle difference between the air flow directions on the inlet side and the outlet side of the heat exchanger 10A becomes large, so a flat heat transfer tube with a longer flat long axis is used. Otherwise, the airflow direction cannot be bent, the pressure loss becomes very large, the flow loss becomes high, and the heat transfer performance deteriorates. Further, the vortex 15 generated in the flat heat transfer tube 12 flows into the downstream once-through fan 5 and interferes with the blades 17 of the once-through fan 5 rotating in the arrow direction 16 to cause noise deterioration.

  In the air conditioner of the present embodiment, a heat exchanger 6A having a circular heat transfer tube 7 is arranged on the upstream side of the heat exchanger 10A on the flat heat transfer tube 12 side as shown in FIG. The width is substantially constant, and the total length 14 of the flat heat transfer tube 12 extending through the long axis 13 of the flat shape intersecting the heat transfer fin 6a and passing through the heat transfer fin 6a portion is minimized. The orientation of the surface of the heat exchanger 6A facing the heat exchanger 10A is adjusted. Therefore, when the airflow 3 sucked from the inlet 2 and discharged from the outlet 4 flows into the unit, it first passes through the heat exchangers 6A, 10A, 6B, and 6C toward the once-through fan 5, The direction of the airflow flowing into the heat exchangers 6A, 6B, 6C is determined by the shape of the air path of the unit, and therefore varies depending on the place. However, normally, the heat transfer fin 6a has a slit 18 (FIG. 4) for enhancing the heat transfer performance, and the slit 18 becomes a resistance against the air flow, so that the air flow 3 entering the heat exchanger 6A is transferred to each heat transfer fin. The course is gradually corrected in such a direction as to pass between 6a by the shortest path. And in the exit of the heat-transfer fin 6a, it flows out in parallel with the width direction 19 of the heat-transfer fin 6a. As a result, the inflow direction to the heat exchanger 10A is along the long axis direction of the flat shape of the flat heat transfer tube 12, the flow loss is low, and vortex generation in the heat transfer tube is reduced.

  Further, among the flat heat transfer tubes 12, the flat heat transfer tubes 12 a that are installed so as to face the direction of the once-through fan 5 are configured by bending the air flow 3 flowing in the lower front portion toward the once-through fan 5 as shown in FIG. 4. The downstream side functions to smoothly send out the airflow 3 flowing in the narrow lower space. As a result, the inflow angle 22 to the blade 17 formed by the straight line 21 extending from the blade tip in the direction 20 of the airflow sent to the cross-flow fan 5 side and the tangential direction of the arc of the blade 17 is reduced (indicated by the arrow in FIG. 4). The direction is defined as a negative angle), and loss due to peeling is reduced.

  The rectifying effect described above is based on the usage time of the unit, such as dust adhering to the suction port 2 and the once-through blower 5, and the environmental conditions due to the place where the unit is installed, for example, the suction space is narrow. Even if the airflow direction changes, the airflow flowing into the flat heat transfer tube 12 is rectified by the upstream heat exchanger 6A, and thus continues. And the aerodynamic performance in the heat exchanger required by the refrigerating cycle surface improves.

  Thus, according to this embodiment, the unit is provided with one or a plurality of heat exchangers constituted by the once-through fan 5, the plurality of heat transfer fins, and the plurality of heat transfer tubes penetrating the heat transfer fins, and the suction port. In the air conditioner that sucks air from 2 and passes through the heat exchanger to exchange heat between the refrigerant and the air, and releases it to the outside of the unit, the heat transfer tube is provided with a heat exchanger 10A composed of a flat heat transfer tube 12a, and further Another heat exchanger 6A in which the width of the heat transfer fin 6a is substantially constant is provided over substantially the entire upstream side of the heat exchanger 10A, and the flat elongated extension 13 of each flat heat transfer tube 12a is upstream. Of the surface of the heat exchanger 6A facing the heat exchanger 10A so that the sum of the lengths 14 crossing the heat transfer fins 6a of the side heat exchanger 6A and passing through the heat transfer fins 6a portion is minimized. Since the arrangement was adjusted by adjusting the orientation Regardless of the environment or usage time can reduce the ventilation resistance of the heat exchanger, the unit can be suppressed noise is small is obtained.

  In addition, when using the heat exchanger as a condenser, it is necessary to perform a refrigerant treatment in a supercooled state, that is, a liquid state, but in the flat heat transfer tube 12a, there are many refrigerant passage channels, and the refrigerant flow rate becomes slow. It is conceivable that the heat transfer performance deteriorates. Therefore, another heat exchanger is required in which the number of flow paths is reduced and the refrigerant flow rate is increased to suppress a decrease in heat transfer performance. In this embodiment, since the heat exchanger 6A having the circular heat transfer tube 7 is arranged on the upstream side of the heat exchanger 10A on the flat heat transfer tube 12a side, the flow rate of the refrigerant can be increased by the heat exchanger 6A. A decrease in heat transfer performance can be suppressed. Further, the flat heat transfer tubes 12a and the circular heat transfer tubes 7 can be connected in series and mixed, and in this case, when the heat exchanger is used as a condenser, that is, during heating, the passage path of the refrigerant is If the side is the flat heat transfer tube 12a and the outlet side is the circular heat transfer tube 7, since the circular heat transfer tube 7 is processed when the refrigerant is in a liquid state, an advantage that the pressure loss in the tube can be suppressed is obtained.

Embodiment 2. FIG.
FIG. 5 is a side sectional view showing an air conditioner according to Embodiment 2 of the present invention. In the figure, the same parts as those in Embodiment 1 are given the same reference numerals.

  In the air conditioner of the present embodiment, a heat exchanger having a flat heat transfer tube is installed not only on the front lower part of the cross-flow blower 5 but also on the front upper part and the rear face so that the amount of heat exchange is not insufficient as shown in FIG. The heat exchanger immediately before the once-through fan 5 is a flat heat transfer tube heat exchanger, and circular heat transfer tubes are respectively provided upstream of the heat exchanger 10B on the upper front side and the heat exchanger 10C on the rear side. The heat exchangers 6B and 6C having 7 are arranged, and the heat exchangers 10B and 10C are basically added to those of the first embodiment described above.

  In the air conditioner of the present embodiment, the flat heat transfer tubes 12b and 12c located on the boundary sides of the heat exchangers 10B and 10C are bent by these so as to prevent the airflows 3a and 3b flowing out from interfering with each other. It is tilted to the 5 side (downward). Further, the lower heat transfer tube 12d of the heat exchanger 10C on the back side is also installed inclined along the air passage.

  When the number of heat exchangers is increased, the aerodynamic resistance increases. However, as in the present embodiment, the heat exchangers 10B and 10C, which are flat heat transfer tubes, are used as the heat exchangers to be added, and circular heat transfer tubes are upstream of each. By arranging the heat exchangers 6B and 6C, the flow can be rectified to flow into the heat exchangers 10B and 10C of the flat heat transfer tubes in the downstream portion, and all the heat exchangers immediately before the once-through fan 5 are flat. It becomes the heat exchangers 10A, 10B, and 10C of the heat transfer tubes 12a, 12c, and 12c, and deterioration of aerodynamic performance can be suppressed small.

  Moreover, it can prevent that the airflow of the upper part of heat exchanger 10B, 10C interferes with the inclination of flat heat exchanger tube 12b, 12c, and an airflow is not obstructed by the air path after leaving heat exchanger 10B, 10C. It can flow smoothly, and the aerodynamic performance in the heat exchanger is improved.

Embodiment 3 FIG.
FIG. 6 is a side sectional view showing an air conditioner according to Embodiment 3 of the present invention. In the figure, the same parts as those in Embodiment 1 are given the same reference numerals.

  In the air conditioner of the present embodiment, heat exchangers having flat heat transfer tubes are installed on the front lower portion, front upper portion, and rear surface of the once-through blower 5, and upstream of these heat exchangers 10A, 10B, and 10C, respectively. The heat exchangers 6D, 6B, and 6E having the circular heat transfer tubes 7 are basically the same as those in the second embodiment described above. However, here, the circular heat transfer tube 7 does not exist on the upstream side of each of the flat heat transfer tube 12a of the heat exchanger 10A on the lower front side and the heat transfer tube 12d of the heat exchanger 10C on the back side. It differs from that of the second embodiment.

  More specifically, in the heat exchanger 6D on the lower side of the circular heat transfer tube on the lower front surface and the heat exchanger 6E on the rear side of the circular heat transfer tube, the heat transfer fins 6b and 6c are not rectangular and the width is constant. Absent. For example, since the wind speed is low where the surroundings are close to the wind path wall (the lower part of the heat transfer fins 6b and the upper and lower parts of the heat transfer fins 6c), the importance of airflow control is low. Further, even when the heat exchanger fins 6D, 6B, and 6E overlap each other (particularly at the top of the heat transfer fins 6b), the airflow control effect does not change even if the heat transfer fins are overlapped. Accordingly, here, a part of the upper part of the heat transfer fin 6b is cut away so that the upstream side of the heat exchanger 10A on the flat heat transfer tube side is not covered. However, in the upper part (especially, the upper part of the front surface) where the flow velocity becomes faster, the air flow must be controlled by the heat exchanger 6B on the circular heat transfer tube 7 side, so the heat transfer fins 6a having a substantially constant width are used on the flat heat transfer tube side. It is comprised so that the upstream of the heat exchanger 10B may be covered.

  In the air conditioner of the present embodiment, the downstream side of the heat transfer fins 6b and 6c is formed by cutting out a portion corresponding to the narrow space, so that the air flow 3 flowing in the narrow space on the downstream side can be sent out more smoothly. it can.

Embodiment 4 FIG.
FIG. 7 is a side sectional view showing an air conditioner according to Embodiment 4 of the present invention. In the figure, the same parts as those in Embodiment 1 are given the same reference numerals.

  In the air conditioner of the present embodiment, heat exchangers 10A, 10B, and 10C having flat heat transfer tubes 12 are installed on the front lower portion, front upper portion, and rear surface of the once-through blower 5, respectively, and these heat exchangers 10A, 10B, The heat exchangers 6A, 6B, and 6C each having the circular heat transfer tube 7 are disposed upstream of 10C, and is basically the same as that of the second embodiment. However, here, each of the heat exchangers 10A, 10B, and 10C is configured such that the long axis direction of the flat shape of the flat heat transfer tube 12 is aligned, which is different from that of the second embodiment described above. Yes.

  In the air conditioner of the present embodiment, the principle that the flow direction is corrected by the upstream heat exchangers 6A, 6B, 6C and flows into the heat exchangers 10A, 10B, 10C on the flat heat transfer tube 12 side is as described above. This is the same as the first embodiment.

  In the present embodiment, each of the heat exchangers 10A, 10B, 10C is configured such that the long axis direction of the flat shape of the flat heat transfer tube 12 is aligned, so that the flat length of each flat heat transfer tube 12 is long. The total length of the extension line of the shaft crossing the heat transfer fins 6a, 6a, 6a of the upstream heat exchangers 6A, 6B, 6C and passing through these heat transfer fins 6a, 6a, 6a is rectangular. Compared to the case where a portion of the flat heat transfer tube 12 is inclined with a heat transfer fin. As a result, the flow resistance in each heat transfer fin 6a portion on the upstream side is reduced, the flow loss is reduced, and the unit low input effect is obtained.

  Moreover, since all the heat exchangers that exchange heat with the airflow immediately before the once-through fan 5 are configured from the heat exchangers 10A, 10B, and 10C of the flat heat transfer tubes 12, the flow resistance is reduced, and the once-through fan. 5 load can be suppressed.

Embodiment 5 FIG.
FIG. 8 is a side sectional view showing an air conditioner according to Embodiment 5 of the present invention. In the figure, the same parts as those in Embodiment 1 are given the same reference numerals.

  In the air conditioner of the present embodiment, flat heat transfer tubes 12e and 12f are inclined at the front lower portion and the rear surface of the once-through fan 5 with respect to the longitudinal direction of the heat transfer fins 10a in the rotation direction of the blades 17 of the once-through fan 5, respectively. The exchangers 10A and 10C are installed, a heat exchanger 6B having a circular heat transfer tube 7 is installed at the upper front of the once-through fan 5, and further, upstream of the heat exchangers 10A and 10C on the flat heat transfer tube side, Heat exchangers 6A and 6C each having a circular heat transfer tube 7 are arranged. That is, in the heat exchanger 10A at the lower front surface, the flat heat transfer tube 12e is directed upward and the air flow 3a is flowed obliquely upward, and in the heat exchanger 10C, the flat heat transfer tube 12f is directed downward. The airflow 3b is arranged so as to flow obliquely downward, the direction of the airflow flowing into the once-through fan 5 is controlled, and the inflow angle to the blade 17 is made small. Other configurations are the same as those of the first embodiment.

  Like the air conditioner of the present embodiment, the flat heat transfer tubes 12e and 12f are inclined with respect to the longitudinal direction of the heat transfer fin 10a, and the airflows 3a and 3b are directed in the direction of rotation with respect to the blades 17 of the once-through fan 5. Then, it becomes difficult for the flow to peel off in the vicinity of the blade 17 and the air blowing performance is improved.

  The edges of the heat transfer fins 6a of the upstream heat exchangers 6A and 6C having the rectifying action and the edges of the heat transfer fins 10a of the heat exchangers 10A and 10C on the flat heat transfer tube side are not arranged in parallel. As described above, the airflow direction can also be rectified by providing a difference in the distance between the edges, and the intended airflow direction can be easily realized. Thereby, the flow in which the inflow angle to the once-through blower 5 is improved can be made, and the unit performance is improved.

Embodiment 6 FIG.
FIG. 9 is a side sectional view showing an air conditioner according to Embodiment 6 of the present invention, in which the same reference numerals are given to the same portions as those of Embodiment 1 described above.

  In the air conditioner of the present embodiment, the flat heat transfer tube 12 is arranged on the front upper portion of the once-through fan 5 along the radiation centered on the once-through fan 5 with respect to the longitudinal direction of the heat transfer fins 10a. And the heat exchangers 6A and 6C having the circular heat transfer tubes 7 are disposed on the front lower portion and the rear surface of the once-through blower 5, and the flat heat transfer tubes are further provided. A heat exchanger 6F having a circular heat transfer tube 7 is arranged on the upstream side of the side heat exchanger 10D. In addition, the upstream heat exchanger 6F has a total length 14 that passes through the heat transfer fin 6d portion, with the flat extension 13 of the flat shape of each flat heat transfer tube 12 intersecting the heat transfer fin 6d. The heat transfer fin 6d has a substantially constant width so as to be minimized. That is, the shape of the heat exchanger 6F in the longitudinal direction is uniquely determined so that the axis of the heat transfer fin 6d in the extending direction intersects with each extension line 13 at right angles to the extension line 13 respectively. It has been made.

  Therefore, in the air conditioner of this embodiment, the direction of the airflow flowing into the flat heat transfer tube 12 can be matched with the long axis direction of the flat shape, and the airflow 3 is concentrated and directed to the once-through fan 5. Can do. For this reason, it is possible to reduce the flow resistance while controlling the direction of the air flow 3, and to make the suction air volume distribution appropriate.

Embodiment 7 FIG.
FIG. 10 is a side sectional view showing an air conditioner according to Embodiment 7 of the present invention. In the figure, the same parts as those in Embodiment 1 are given the same reference numerals.

  In the air conditioner of this embodiment, in order to increase the heat transfer area, the width of the heat transfer fins 10b in the lower front portion is locally changed (expanded) according to the installation space.

  Also in the present embodiment, as in the first embodiment described above, the long extension 13 of the flat shape of the flat heat transfer tube intersects the heat transfer fin 6a on the upstream side and passes through the heat transfer fin 6a portion. By minimizing the sum of the lengths 14, the same effects as those of the first embodiment can be obtained.

  Further, the heat exchange efficiency is improved by increasing the width of the heat transfer fin 10b.

Embodiment 8 FIG.
FIG. 11 is a side sectional view showing an air conditioner according to Embodiment 8 of the present invention, in which the same reference numerals are given to the same portions as those in Embodiment 1 described above.

  In the air conditioner of the present embodiment, a heat exchanger 10B having a flat heat transfer tube 12 is arranged in the upper front portion of the unit. On the upstream side, in order to give the air conditioner a function as an air purifier, a dust collecting or air purifying device or filter having a substantially constant thickness (hereinafter, these are simply referred to as “filter”). 9A is arranged. The filter 9A has its heat exchanger such that the total length 14 of the flat long axis 13 of each flat heat transfer tube 12 crossing the filter 9A and passing through the filter 9A portion is minimized. The direction of the surface facing 10B is adjusted and arranged. This may be considered that the rectifying component is replaced from the heat exchanger to the filter 9A.

  In the air conditioner of the present embodiment, the direction of the airflow 3 passing through the filter 9A changes so as to pass through the shortest path in order to minimize the resistance when passing through the filter, as in the first embodiment. As a result, the airflow 3 immediately after the filter 9A faces the flat major axis direction of the flat heat transfer tube 12, and the flow resistance when passing through the heat exchanger 10B decreases.

Embodiment 9 FIG.
FIG. 12 is a side sectional view showing an air conditioner according to Embodiment 9 of the present invention, in which the same parts as those in Embodiments 1 and 6 are given the same reference numerals. Note that FIG. 9 is referred to in the description here.

  In the air conditioner of the present embodiment, a heat exchanger 10D that inclines the flat heat transfer tube 12 along the radiation centering on the once-through fan 5 is disposed in the upper front portion of the unit. On the upstream side, in order to give the air conditioner a function as an air purifier, a dust collecting or air purifying device or filter having a substantially constant thickness (hereinafter, these are simply referred to as “filter”). 9B is arranged. The filter 9B is configured in an arc shape so that the total length 14 of the flat long axis 13 of each flat heat transfer tube 12 crossing the filter 9B and passing through the filter 9B portion is minimized. (See FIG. 9). In other words, the shape of the filter 9B is uniquely determined so that the axis in the height direction intersects each of the radial extension lines 13 so that the filter 9B is orthogonal to the extension lines 13, respectively. Therefore, it may be considered that the rectifying component is replaced from the heat exchanger 6F in FIG. 9 to the filter 9B.

  In the air conditioner of the present embodiment, the direction of the airflow 3 passing through the filter 9B changes so as to pass through the shortest path in order to minimize the resistance when passing through the filter, as in the first embodiment. As a result, the airflow 3 immediately after the filter 9B is directed in the long axis direction of the flat shape of the flat heat transfer tube 12, and the airflow 3 is concentrated toward the once-through fan 5. For this reason, it is possible to reduce the flow resistance while controlling the direction of the air flow 3, and to make the suction air volume distribution appropriate.

Embodiment 10 FIG.
FIG. 13 is a side sectional view showing an air conditioner according to Embodiment 10 of the present invention, in which the same reference numerals are given to the same portions as those in Embodiment 1 described above.

  The air conditioner of the present embodiment includes a heat exchanger 10F having a flat heat transfer tube 12 having a heat transfer fin 10c whose longitudinal direction 23 is bent in a U shape in accordance with the internal shape of the unit. A heat exchanger 6C having a circular heat transfer tube 7 is disposed on the back surface of the unit and disposed in a space from the lower front surface to the upper front surface of the blower 5, and further, a square shape of the heat exchanger 10F on the flat heat transfer tube side. The heat exchangers 6A and 6B having the circular heat transfer tubes 7 are disposed on the upstream side of the two sides, that is, on the lower part of the front surface and the upper part of the front surface.

  In the air conditioner of the present embodiment, the upstream heat exchangers 6A, 6B have substantially constant widths of the heat transfer fins 6a, 6a, and the heat transfer fins 10c of the downstream heat exchanger 10F Considering the bent portion 10d in the longitudinal direction as an upper boundary and a lower boundary, the extension line of the flat long axis of each flat heat transfer tube 12 intersects with the heat transfer fins 6a, 6a on the upstream side. The direction of the surface facing the heat exchanger 10F is adjusted so that the sum of the lengths 14a and 14b passing through the heat transfer fins 6a and 6a is minimized, and the entire surface upstream of the heat exchanger 10F is adjusted. Are arranged. As a result, the ventilation resistance of the heat exchanger can be reduced, the noise can be suppressed small, and the heat transfer performance can be improved regardless of the environment and usage time.

Embodiment 11 FIG.
FIG. 14 is a side sectional view showing an air conditioner according to Embodiment 11 of the present invention, in which the same reference numerals are given to the same portions as those of Embodiment 1 described above.

  The air conditioner according to the present embodiment includes the heat transfer fins 10c whose longitudinal direction 23 is bent in a U shape in accordance with the internal shape of the unit as in the above-described embodiment 10, and has the flat heat transfer tube 12. The heat exchanger 10F is arranged in the space from the lower front part to the upper front part of the cross-flow fan 5 of the unit, and the heat exchanger 6C having the circular heat transfer pipe 7 is arranged on the rear side of the unit, and further the flat heat transfer tube side A heat exchanger 6G having a circular heat transfer tube 7 on the upstream side of the heat exchanger 10F and the heat transfer fins 6e bent in a U-shape is also provided on the entire upstream surface of the heat exchanger 10F along the heat exchanger 10F. It is arranged over.

  By the way, when the heat exchanger having the circular heat transfer tube on the upstream side of the heat exchanger 10F on the flat heat transfer tube side is divided and configured as in the above-described embodiment 10, all the flat heat transfer tubes 12 cannot be covered. There is a possibility that there may be a place where the airflow 3 flowing into the flat heat transfer tube 12 cannot be controlled (for example, a boundary portion between adjacent heat exchangers having circular heat transfer tubes).

  In the air conditioner of the present embodiment, the longitudinal direction 23 of the heat transfer fin 10c of the heat exchanger 10F on the flat heat transfer tube side and the longitudinal direction 24 of the heat exchanger 6G on the circular heat transfer tube side having a single configuration are aligned. Therefore, it is possible to reliably cover substantially the entire upstream side of the flat heat transfer tube 12 and to control the air flow by the upstream heat exchanger 6G, improving the direction of the air flow flowing into the flat heat transfer tube 12, Heat transfer performance can be improved.

  Further, the total length of the lengths 14a, 14b, and 14c passing through the heat transfer fin 6e portion is minimized so that the extension line of the flat long axis of each flat heat transfer tube 12 intersects the heat transfer fin 6e on the upstream side. Further, the orientation of the surface of the heat exchanger 6G facing the heat exchanger 10F is adjusted. As a result, the ventilation resistance of the heat exchanger can be reduced, the noise can be suppressed small, and the heat transfer performance can be improved regardless of the environment and usage time.

Embodiment 12 FIG.
FIG. 15 is a side sectional view showing an air conditioner according to Embodiment 12 of the present invention. In the figure, the same parts as those in Embodiment 10 are given the same reference numerals. Here, in the description, the above-described FIGS. 11 and 13 are referred to.

  The air conditioner of the present embodiment is a part of the heat exchanger upstream of the heat exchanger 10F having the flat-shaped heat transfer tube 12 having the letter-shaped heat transfer fins 10c in the above-described tenth embodiment (heat exchanger 6B) is replaced with a dust collecting or air cleaning device or filter having a substantially constant thickness (hereinafter collectively referred to simply as “filter”) 9C.

  In the air conditioner of the present embodiment, the filter 9C serving as a rectifying means is configured such that a flat long-axis extension line 13 (see FIG. 11) of each flat heat transfer tube 12 of the heat exchanger 10F intersects the filter 9C. The orientation of the surface facing the heat exchanger 10F is adjusted so that the total length 14 (see FIG. 11) passing through the filter 9C portion is minimized. Accordingly, the direction of the air flow 3 passing through the filter 9C changes so as to pass through the shortest path in order to minimize the resistance when passing through the filter, as in the first embodiment. As a result, the airflow 3 immediately after the filter 9C is directed in the long axis direction of the flat shape of the flat heat transfer tube 12, the flow resistance when passing through the heat exchanger 10F is reduced, and the suction airflow distribution can be made appropriate.

Embodiment 13 FIG.
FIG. 16 is a side sectional view showing an air conditioner according to Embodiment 13 of the present invention. In the figure, the same parts as those in Embodiment 11 are given the same reference numerals. Here, in the description, reference is made to FIG. 14 described above.

  The air conditioner of the present embodiment has a substantially constant thickness of the heat exchanger 6G on the upstream side of the heat exchanger 10F having the flat-shaped heat transfer tubes 12 having the dog-shaped heat transfer fins 10c in the above-described Embodiment 11. In the same manner as in the heat transfer fin 10c, a dust collecting or air cleaning device or filter (hereinafter collectively referred to simply as "filter") 9D bent in a dogleg shape is replaced.

  Also in the air conditioner of the present embodiment, the longitudinal direction 23 (see FIG. 14) of the heat transfer fin 10c of the heat exchanger 10F on the flat heat transfer tube side and the longitudinal direction 24 (see FIG. 14) of the filter 9D, as in the above-described Embodiment 11. 14), the substantially entire upstream side of the flat heat transfer tube 12 can be reliably covered, and the air flow control by the upstream filter 9D becomes possible, and the direction of the air flow flowing into the flat heat transfer tube 12 is improved. In addition, the heat transfer performance of the unit can be improved.

  Further, the sum of the lengths 14a, 14b, and 14c (see FIG. 14) in which the extension line of the flat long axis of each flat heat transfer tube 12 intersects the upstream filter 9D and passes through the filter 9D portion is minimized. Thus, the direction of the surface facing the heat exchanger 10F of the filter 9D is adjusted and arranged. As a result, the ventilation resistance of the heat exchanger can be reduced, the noise can be suppressed small, and the heat transfer performance can be improved regardless of the environment and usage time.

Embodiment 14 FIG.
FIG. 17 is a front view showing a heat transfer fin mounted on an air conditioner according to Embodiment 14 of the present invention, and FIG. 18 is a front view showing a heat transfer fin mounted on a comparative example. The same parts as those in the first embodiment are denoted by the same reference numerals.

  Although the example of implementation so far mentioned only when the cross-sectional shape of the heat transfer tube is one kind in one heat transfer fin when viewed from the side of the heat exchanger, the air conditioner of the present embodiment The heat transfer tubes having different cross-sectional shapes, that is, the circular heat transfer tube 7 and the flat heat transfer tube 12 are arranged in one heat transfer fin 30A as viewed from the side of the exchanger. That is, as shown in FIG. 17, the circular heat transfer tubes 7 are arranged in the first row on the upstream side, and the flat heat transfer tubes 12 are arranged in the second and subsequent rows.

  As shown in the comparative example (FIG. 18), when two or more circular heat transfer tubes 7 are arranged in one heat transfer fin, a downstream portion 28 having a low flow velocity is generated in the downstream portion of the circular heat transfer tube 7. In such a case, in order to maintain the heat transfer performance, when the circular heat transfer tubes 7 are arranged in a staggered manner for each row, the wake area generated in the first row narrows the flow path between the heat transfer tubes in the second row. To increase current loss. Therefore, in the present embodiment, as shown in FIG. 17, the heat transfer tubes are the circular heat transfer tubes 7 in the first row and the flat heat transfer tubes 12 in the second row.

  Since the direction of the airflow flowing into the heat exchanger varies depending on the position of the unit, the circular heat transfer tube 7 is arranged instead of the flat heat transfer tube 12 that is easily affected by the inflow direction so as not to increase the airflow resistance. On the other hand, in the second row, the influence of the rear flow area created by the circular heat transfer tube 7 is reduced using the flat heat transfer tube 12 in order to secure the flow path width. As described above, the airflow 3 passing through the heat exchanger is gradually perpendicular to the longitudinal direction of the heat transfer fins 30A due to resistance such as slits (see the slits 18 in FIG. 4) installed in the heat transfer fins 30A. Therefore, if the flat heat transfer tube 12 is installed so as to be parallel to the width direction 19 of the heat transfer fin 30A, the flow resistance can be reduced and the heat transfer performance can be improved.

Embodiment 15 FIG.
FIG. 19 is a front view (a) of a heat transfer fin mounted on an air conditioner according to Embodiment 15 of the present invention and a side sectional view (b) of the air conditioner. The same parts as those in FIG.

  The air conditioner of this embodiment is obtained by adding a function of airflow control to the heat exchanger described in Embodiment 14, and among the plurality of flat heat transfer tubes 12 in FIG. Is formed by inclining the long extension line 13 of the flat shape with respect to the width direction 19 of the heat transfer fin 30B.

For example, when this heat exchanger is installed at the lower front portion of the air conditioner as shown in FIG. 19B, the lowermost airflow 3 is smoothly sent to the once-through fan 5 as in the first embodiment. The same effect as in the first embodiment can be obtained.
Moreover, when mounted on the unit, the heat exchanger is reduced from two to one in the depth direction, so that the space at the lower part of the front surface is widened, so that airflow can be more easily sucked and the performance can be improved. Alternatively, the entire unit can be made compact while keeping the space constant.

Embodiment 16 FIG.
FIG. 20 is a front view showing a heat transfer fin mounted on an air conditioner according to Embodiment 16 of the present invention. In FIG. 20, the same parts as those of Embodiment 1 are given the same reference numerals.

  In the air conditioner of this embodiment, the circular heat transfer tubes 7 and the flat heat transfer tubes 12 are mixed in one heat transfer fin 30C when viewed from the side of the heat exchanger. That is, the circular heat transfer tubes 7 are arranged in the first row on the upstream side, and the flat heat transfer tubes 12 are arranged in the second, third, and third rows. The arrangement interval (inter-column spacing) of the heat transfer tubes is smaller in the interval (inter-column pitch) 26b between the second and third columns than in the inter-column interval (inter-pitch) 26a. It has become. This is because the use of the flat heat transfer tube 12 narrows the wake area where the flow velocity is low, and the influence thereof is reduced. Therefore, the reduction in performance does not occur even if the interval between the heat transfer tubes is reduced. For this reason, the depth dimension of the heat exchanger provided with a plurality of flat heat transfer tube rows on the downstream side of the circular heat transfer tube row in one heat transfer fin as viewed from the side of the heat exchanger having the circular heat transfer tube rows is shortened. This can reduce the flow loss of the heat exchanger and widen the suction space, improving the performance. In addition, the unit can be made compact.

Embodiment 17. FIG.
FIG. 21 is a side sectional view showing a heat transfer fin mounted on an air conditioner according to Embodiment 17 of the present invention. In the figure, the same parts as those in Embodiment 1 are given the same reference numerals. .

  In the air conditioner of this embodiment, the circular heat transfer tubes 7 and the flat heat transfer tubes 12 are mixed in one heat transfer fin 30D as viewed from the side of the heat exchanger. That is, the circular heat transfer tubes 7 are arranged in the first row on the upstream side, and the flat heat transfer tubes 12 are arranged in the second row. About the arrangement | positioning of the step direction 29 of the flat heat exchanger tube 12, the circular heat exchanger tube 7 and the flat heat exchanger tube 12 are comprised so that it may arrange | position in zigzag form. This is suitable when the aerodynamic load is dominant on the input of the entire unit.

  In the air conditioner of this embodiment, since the distance between the adjacent heat transfer tubes is open, the airflow 3 can easily pass through and the aerodynamic load can be reduced. Further, since the flat heat transfer tube 12 is arranged on the downstream side, the air flow direction is corrected by the circular heat transfer tube 7 on the upstream side, and the flow follows the flat heat transfer tube 12 on the downstream side. As a result, a unit with a small aerodynamic load can be realized, and noise reduction can be achieved.

  The heat transfer fin 30D of this embodiment is suitable for an air conditioner having a small capacity in which an aerodynamic load is dominant in the input of the entire unit. It becomes easy. In addition, it cannot be overemphasized that this embodiment is applicable also to the above-mentioned Embodiments 14-16 in which the heat exchanger tube from which cross-sectional shape differs is mixed in one heat exchanger fin seeing from the heat exchanger side.

Embodiment 18 FIG.
FIG. 22 is a side sectional view showing a heat transfer fin mounted on an air conditioner according to Embodiment 18 of the present invention. In the figure, the same parts as those in Embodiment 1 are given the same reference numerals. .

  In the air conditioner of this embodiment, the circular heat transfer tubes 7 and the flat heat transfer tubes 12 are mixed in one heat transfer fin 30E when viewed from the side of the heat exchanger. That is, the circular heat transfer tubes 7 are arranged in the first row on the upstream side, and the flat heat transfer tubes 12 are arranged in the second row. In the step direction 29, a plurality (two in this case) of flat heat transfer tubes 12 are arranged between the circular heat transfer tubes 7, and in the width direction 19 (see FIG. 19), behind the circular heat transfer tubes 7, that is, in the heat transfer tubes 7. The flat heat transfer tubes 12 are not arranged in the shadowed portions when the first row of circular heat transfer tubes 7 are projected downstream in the direction perpendicular to the longitudinal direction (step direction) of the heat fins 30E. Yes.

  The wind speed flowing into the heat exchanger is fast between the circular heat transfer tubes 7 when viewed in the step direction. Therefore, like the air conditioner of this embodiment, by arranging the flat heat transfer tubes 12 in a concentrated manner between the circular heat transfer tubes 7 whose wind speed is fast, the heat exchange amount is increased while suppressing an increase in flow loss. be able to. At the back of the circular heat transfer tube 7 where the wind speed is slow, the number of flat heat transfer tubes 12 is reduced rather than the amount of heat exchange, and emphasis is placed on securing the air path. Thereby, the air conditioner which improved heat-transfer performance is realizable.

Embodiment 19. FIG.
FIG. 23 is a side sectional view showing a heat transfer fin mounted on an air conditioner according to Embodiment 19 of the present invention. In the figure, the same parts as those in Embodiment 1 are given the same reference numerals. .

  When flat heat transfer tubes and circular heat transfer tubes coexist in one heat transfer fin as in the above-described embodiments 14 to 18, the refrigerant passage during heating has a flat heat transfer tube on the inlet side and a circular shape on the outlet side. When the heat transfer tube is used, an advantage is obtained in that the pressure loss in the tube can be kept low because the refrigerant is processed by the circular heat transfer tube when in a liquid state.

  However, at that time, the refrigerant temperature difference between the inlet side and the outlet side of the refrigerant increases with the same heat transfer fin, heat is exchanged between the pipes through the heat transfer fin, and the heat transfer between the air-heat transfer fins It can be thought that it will decrease (heat loss).

  As shown in FIG. 23, the air conditioner according to the present embodiment has a slit having a size that takes into account a temperature difference between pipes between the row of flat heat transfer tubes 12 and the row of circular heat transfer tubes 7 in the heat transfer fin 30F. And a heat insulating part made up of a cut 31 is provided to block heat.

  In the air conditioner of the present embodiment, the heat transfer between the pipes through the heat transfer fins is prevented by the heat insulating portion including the slits and the cuts 31. For this reason, a heat loss can be reduced and the performance of an air conditioner can be improved.

It is side surface sectional drawing which shows the air conditioner which concerns on Embodiment 1 of this invention. It is a schematic diagram of the airflow inside the air conditioner of a comparative example. It is a schematic diagram of the airflow around the heat exchanger in the air conditioner of the comparative example. It is a schematic diagram of the airflow around the heat exchanger of the air conditioner according to Embodiment 1 of the present invention. It is side surface sectional drawing which shows the air conditioner which concerns on Embodiment 2 of this invention. It is side surface sectional drawing which shows the air conditioner which concerns on Embodiment 3 of this invention. It is side surface sectional drawing which shows the air conditioner which concerns on Embodiment 4 of this invention. It is side surface sectional drawing which shows the air conditioner which concerns on Embodiment 5 of this invention. It is side surface sectional drawing which shows the air conditioner which concerns on Embodiment 6 of this invention. It is side surface sectional drawing which shows the air conditioner which concerns on Embodiment 7 of this invention. It is side surface sectional drawing which shows the air conditioner which concerns on Embodiment 8 of this invention. It is side surface sectional drawing which shows the air conditioner which concerns on Embodiment 9 of this invention. It is side surface sectional drawing which shows the air conditioner concerning Embodiment 10 of this invention. It is side surface sectional drawing which shows the air conditioner concerning Embodiment 11 of this invention. It is side surface sectional drawing which shows the air conditioner concerning Embodiment 12 of this invention. It is side surface sectional drawing which shows the air conditioner concerning Embodiment 13 of this invention. It is a front view which shows the heat-transfer fin mounted in the air conditioner which concerns on Embodiment 14 of this invention. It is a front view which shows the heat-transfer fin mounted in the air conditioner of a comparative example. It is the front view (a) of the heat-transfer fin mounted in the air conditioner which concerns on Embodiment 15 of this invention, and side sectional drawing (b) of an air conditioner. It is a front view which shows the heat-transfer fin mounted in the air conditioner which concerns on Embodiment 16 of this invention. It is a front view which shows the heat-transfer fin mounted in the air conditioner which concerns on Embodiment 17 of this invention. It is a front view which shows the heat-transfer fin mounted in the air conditioner which concerns on Embodiment 18 of this invention. It is a front view which shows the heat-transfer fin mounted in the air conditioner which concerns on Embodiment 19 of this invention.

Explanation of symbols

  2 inlet, 3 airflow, 4 outlet, 5 once-through fan (blower), 6a to 6e, 10a to 10c, 30A to 30F heat transfer fin, 6A to 6G heat exchanger on the circular heat transfer tube side, 7 circular heat transfer tube, 9A to 9D filter, 10A to 10F flat heat transfer tube side heat exchanger, 12, 12a to 12f flat heat transfer tube, 13 flat extension of long axis, 14 length passing through rectifying means, 26a, 26b rows Pitch, 31 slits and cuts.

Claims (17)

Inside the unit, one or more heat exchangers consisting of a plurality of heat transfer fins and a plurality of heat transfer tubes penetrating these heat transfer fins are arranged so as to surround the blower, and air is sucked from the suction port by the rotation of the blower An air conditioner that passes through the heat exchanger to exchange heat between the refrigerant and air, and discharges the air from the outlet to the outside of the unit,
A heat exchanger having a flat cross-sectional shape of the heat transfer tube, provided on the upstream side of the heat exchanger having the flat heat transfer tube is a rectifying means for rectifying the direction of airflow flowing into the heat exchanger; The rectifying means has a substantially constant width or thickness as viewed from the side of the heat exchanger, and the flat long-axis extension line of each flat heat transfer tube intersects the rectifying means and passes through the rectifying means portion. An air conditioner characterized by being installed so that the total length is minimized.   2. One of the plurality of flat heat transfer tubes arranged at least in a narrow space in the unit is configured such that the direction of the long axis of the flat shape faces the direction of the blower. The air conditioner described.   The rectifying means disposed on the upstream side of the heat exchanger of the flat heat transfer tube is a heat exchanger having a plurality of heat transfer fins and a plurality of circular heat transfer tubes whose cross-sectional shape passing through these heat transfer fins is a circular tube shape. 2. The structure according to claim 1, wherein the surface of the flat heat transfer tube on the downstream side thereof is adjusted so that the total of the lengths is minimized, and the orientation of the surface facing the heat exchanger is adjusted. Item 3. An air conditioner according to Item 2.   The heat transfer fins of the heat exchanger on the flat heat transfer tube side are formed so that the longitudinal direction is linear, and the heat exchanger on the circular heat transfer tube side is connected to the entire upstream surface of the heat exchanger on the flat heat transfer tube side. The air conditioner according to claim 3, wherein the air conditioner is arranged over a wide area.   The heat transfer fins of the heat exchanger on the flat heat transfer tube side are bent in the longitudinal direction, and the heat exchanger on the circular heat transfer tube side extends over the entire upstream side of the heat exchanger on the flat heat transfer tube side. The air conditioner according to claim 3, wherein the air conditioner is arranged.   When the heat exchanger is used as a condenser, the refrigerant inlet side is a flat heat transfer tube side heat exchanger, and the refrigerant outlet side is a circular heat transfer tube side heat exchanger. The air conditioner according to claim 5.   The rectifying means arranged on the upstream side of the heat exchanger of the flat heat transfer tube is constituted by dust collecting or air cleaning equipment or a filter, and the downstream side heat exchanger so that the total of the length is minimized. The air conditioner according to claim 1 or 2, wherein the air conditioner is arranged by adjusting a direction of a surface opposed to the air conditioner.   The heat transfer fin of the heat exchanger on the flat heat transfer tube side is formed so that its longitudinal direction is linear, and the dust collecting and air cleaning device or filter is connected upstream of the heat exchanger on the flat heat transfer tube side. The air conditioner according to claim 7, wherein the air conditioner is disposed over the entire side surface.   The heat transfer fin of the heat exchanger on the flat heat transfer tube side is formed by bending its longitudinal direction, and the dust collecting and air cleaning device or filter is provided on the upstream side of the heat exchanger on the flat heat transfer tube side. The air conditioner according to claim 7 or 8, wherein the air conditioner is arranged over the entire surface.   The air conditioner according to any one of claims 1 to 9, wherein all of the heat exchangers that exchange heat with the air flow immediately before the blower are flat heat transfer tube heat exchangers. .   A plurality of circular heat transfer tubes whose cross-sectional shape penetrating the upstream side of the heat transfer fins of the heat exchanger of the flat heat transfer tube is a circular tube shape, the rectifying means disposed on the upstream side of the heat exchanger of the flat heat transfer tube. A heat exchanger having two or more rows of heat transfer tubes arranged on a single heat transfer fin when viewed from the side of the heat exchanger, and the first heat transfer tube on the upstream side is the circular heat transfer tube. The air conditioner according to claim 1, wherein the second and subsequent rows are flat heat transfer tubes.   One of the flat heat transfer tubes in the second and subsequent rows arranged in at least a narrow space in the unit is configured such that the direction of the long axis of the flat shape faces the direction of the blower. The air conditioner according to claim 11.   The air conditioner according to claim 11 or 12, wherein the first row of circular heat transfer tubes and the second and subsequent flat heat transfer tubes are arranged in a staggered manner.   The flat heat transfer tube is not arranged in a portion that is shaded when the first row of circular heat transfer tubes is projected downstream in a direction perpendicular to the longitudinal direction of the heat transfer fins. Item 13. An air conditioner according to item 12.   The air conditioner according to any one of claims 11 to 14, wherein a pitch between rows after the second row is shorter than a pitch between rows between the first row and the second row.   When the heat exchanger is used as a condenser, the refrigerant passage path is set so that the refrigerant inlet side is a flat heat transfer tube and the refrigerant outlet side is a circular heat transfer tube. The air conditioner according to claim 15.   The air conditioner according to any one of claims 11 to 16, wherein a slit or a cut is provided between the first row and the second row to block heat transfer.

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