JP3177300U - Air conditioning unit - Google Patents

Abstract

[PROBLEMS] To achieve excellent heat exchange performance by substantially uniforming the temperature difference per ventilation area of the air flowing from the leeward heat exchanger to the leeward heat exchanger and maximizing the frost formation effect of the leeward heat exchanger. Provide air conditioning and heating equipment.
SOLUTION: A compressor 5, an indoor unit heat exchanger 6, an upside heat exchanger 11 and an leeward side-by-side connection in series on the upwind side and downwind side of the outside air ventilation path 7 in series. In a heating / cooling air conditioner including a side heat exchanger 12, at least the windward side heat exchanger 11 is made up of a pair of aluminum header pipes facing each other up and down, and aluminum flat heat parallel to each other communicating with the pair of header pipes. A parallel flow type heat exchanger composed of an exchange pipe and an aluminum fin interposed between adjacent flat heat exchange pipes, and the distance between the windward side heat exchanger 11 and the leeward side heat exchanger 12 is 5 to 50 mm.
[Selection] Figure 1

Description

  The present invention relates to a novel structure of a cooling / heating air conditioner (system).

  Generally, in a heat exchanger for an outdoor unit of a cooling and heating air conditioner, when the temperature of the outside air decreases during the heating operation, frost adheres to the heat exchanger for the outdoor unit, and the air flow rate and the heat exchange amount are reduced. It was necessary to defrost to make it come.

  For this reason, for example, in Patent Document 1 (Japanese Patent Laid-Open No. 10-253188), the outdoor unit heat exchanger is divided into an upwind heat exchanger and a downwind heat exchanger, and from the indoor heat exchanger during heating, The thing of the structure which flows the discharged refrigerant in order of a windward side heat exchanger and a leeward side heat exchanger, and defrosts during heating operation is known (patent document 1, a claim, FIG. 1, etc.) reference).

  For example, in patent document 2 (Unexamined-Japanese-Patent No. 2002-333242), the air-conditioning air-conditioning apparatus which added the switching valve and piping to the windward side heat exchanger and the leeward side heat exchanger which were arranged side by side as mentioned above. The structure of defrosting by switching between normal (heating) operation and defrosting operation is also known (see Patent Document 2, Claims, and FIGS. 2 to 4).

  However, the outdoor unit heat exchangers described in Patent Documents 1 and 2 have a structure in which the windward side heat exchanger covers the entire surface of the leeward side heat exchanger, so that the installation space for the outdoor unit heat exchanger is widened. There was a need to do. In addition, since the windward side heat exchanger covers the entire surface of the leeward side heat exchanger, there is a problem that the pressure loss of the air flowing through the ventilation path is increased and the heat exchange performance is deteriorated. Furthermore, since the fin-and-tube heat exchanger has a structure in which a plurality of rows of meandering heat transfer tubes 4 are passed through the heat transfer fins 3, the core becomes thick and the installation space needs to be widened accordingly. .

  On the other hand, Patent Document 3 (Japanese Patent Application Laid-Open No. 2008-25897) can reduce the installation space of the outdoor unit heat exchanger, reduce the pressure loss of the air flowing through the ventilation path, and perform heat exchange. A technique intended to provide a heat exchanger for an outdoor unit of an air-conditioning and air-conditioning apparatus capable of improving performance is disclosed.

  That is, in Patent Document 3, the windward side heat exchanger is formed by an aluminum parallel flow type heat exchanger having an entire area of 1/4 to 2/3 of the entire area of the leeward side heat exchanger. There is disclosed a heat exchanger for an outdoor unit of an air-conditioning / air-conditioning apparatus characterized by the above (see Patent Document 3, Abstract, etc.).

Japanese Patent Laid-Open No. 10-253188 JP 2002-333242 A JP 2008-25897 A

  However, in the outdoor unit heat exchanger described in Patent Document 3, when the heated air passing through the upwind heat exchanger is supplied to the downwind heat exchanger, the ventilation area of the upwind heat exchanger is There is a temperature difference in the heat exchanger surface temperature from the refrigerant inlet side to the outlet side, and the temperature difference becomes the temperature difference of the passing air supplied to the leeward heat exchanger as it is, and the frost prevention effect of the leeward heat exchanger It does not take into account that it has an effect on (hard frost effect).

  Therefore, the object of the present invention is that even if the entire area of the leeward heat exchanger and the entire area of the leeward heat exchanger are substantially the same, the size does not increase unnecessarily. The object is to provide a cooling / heating air conditioner with excellent heat exchange performance by making the temperature difference per ventilation area of the air flowing through the side heat exchanger substantially uniform and maximizing the hard frost effect of the leeward side heat exchanger. .

In order to solve the above-mentioned problems, the present invention has a heat exchanger for a compressor and an indoor unit, and is arranged on the windward side and the leeward side of the outside air ventilation path so as to face each other in series by serial connection. And the leeward heat exchanger are used as outdoor unit heat exchangers, and during heating, after the high-temperature refrigerant flows into the upwind heat exchanger, the refrigerant that has become low temperature due to adiabatic expansion is supplied to the leeward heat exchanger. A cooling and heating air conditioner having a configuration in which a high-temperature refrigerant flows in the order of the leeward heat exchanger and the windward heat exchanger during flow and cooling,
At least the upwind heat exchanger includes a pair of aluminum header pipes facing each other vertically, a flat aluminum heat exchange pipe parallel to each other communicating with the pair of header pipes, and an adjacent flat heat exchange pipe A parallel flow heat exchanger composed of aluminum fins interposed between
The distance between the windward side heat exchanger and the leeward side heat exchanger is 5 to 50 mm,
An air-conditioning / air-conditioning apparatus is provided.

  According to the air-conditioning / air-conditioning apparatus of the present invention having such a configuration, even if the entire area of the windward heat exchanger and the entire area of the leeward heat exchanger are substantially the same, the dimensions do not increase unnecessarily. In addition, it is possible to realize an air conditioner with excellent heat exchange performance due to difficult frost formation due to stirring of air flowing from the windward heat exchanger to the leeward heat exchanger.

  As a result of producing a number of prototypes and repeating the diligent experiments, the inventors have determined that if the distance between the windward side heat exchanger and the leeward side heat exchanger is 5 mm or more, the windward side heat exchanger and the leeward side If the air flowing through the heat exchanger is agitated and sufficient frost formation effect can be secured, and the distance between the windward side heat exchanger and the leeward side heat exchanger is 50 mm or less, the size of the air conditioner is increased. It has been found that sufficient heat exchange performance can be ensured without doing so. In particular, when the distance between the windward side heat exchanger and the leeward side heat exchanger exceeds 50 mm, no further improvement in the heat exchange performance can be expected, and only the size of the air-conditioning / air-conditioning apparatus is increased.

  In the air-conditioning / air-conditioning apparatus according to the present invention, both the upwind heat exchanger and the downwind heat exchanger communicate with a pair of aluminum header pipes facing each other and the pair of header pipes. It is preferable that the parallel flow type heat exchanger is composed of aluminum flat heat exchange tubes parallel to each other and aluminum fins interposed between adjacent flat heat exchange tubes.

  According to the air-conditioning / air-conditioning apparatus of the present invention having such a configuration, both the windward side heat exchanger and the leeward side heat exchanger can have the same structure, and the thicknesses of both the heat exchangers can be set to fin and・ It can be made thinner than tube heat exchangers. In addition, by arranging the flat heat exchange tubes in the vertical direction, it is possible to make it difficult to collect the condensed water or water generated by defrosting attached to the flat heat exchange tubes. In addition, the heat exchanger can be thinned while maintaining high heat exchange performance.

  In the air conditioning / heating air conditioner of the present invention, the distance between the windward side heat exchanger and the leeward side heat exchanger is preferably 10 to 50 mm, and more preferably 30 to 50 mm.

  If the distance between the windward side heat exchanger and the leeward side heat exchanger is within the above range, the agitation of the air flowing from the windward side heat exchanger to the leeward side heat exchanger is more reliably suppressed while suppressing the size of the air conditioning air conditioner. Further, sufficient heat exchange performance can be ensured by difficult frost formation by stirring the air.

In the air conditioning / air conditioning apparatus of the present invention, a first check valve that passes the refrigerant during heating and a pipe connecting the indoor unit heat exchanger and the windward heat exchanger, and during cooling A first expansion valve that functions only and passes the refrigerant without depressurization, and is interposed in parallel,
A second check valve that allows the refrigerant to pass during cooling, and a second valve that functions only during heating and passes the refrigerant without reducing pressure, to a pipe connecting the windward heat exchanger and the leeward heat exchanger. It is preferable that the expansion valve is interposed in parallel.

  According to the cooling / heating air conditioning apparatus of the present invention having such a configuration, the temperature difference per ventilation area of the air flowing from the windward side heat exchanger to the leeward side heat exchanger is made uniform, and the effect of difficult frost formation is maximized. Thus, the heat exchange performance can be improved, and the function as an air conditioning and air conditioning apparatus can be reliably exhibited.

  According to the present invention, even if the entire area of the leeward heat exchanger and the entire area of the leeward heat exchanger are substantially the same, the airflow flowing from the leeward heat exchanger to the leeward heat exchanger Thus, it is possible to provide an air conditioning / air conditioning apparatus having a small temperature difference and excellent heat exchange performance.

It is a schematic block diagram which shows the structure of the air conditioning air conditioning apparatus 1 which concerns on one Embodiment of this invention (state at the time of heating operation). It is a schematic block diagram which shows the structure of the air conditioning air conditioning apparatus 1 which concerns on one Embodiment of this invention (state at the time of air_conditionaing | cooling operation). It is a schematic block diagram which expand | deploys and shows an example of the windward side heat exchanger 11 and the leeward side heat exchanger 12 which comprise the heat exchanger 10 for outdoor units in the air conditioning air conditioner 1 of FIG.1 and FIG.2. It is a perspective view which shows an example of the windward side heat exchanger 11 and the leeward side heat exchanger 12 in the air conditioning air conditioner 1 of FIG.1 and FIG.2. The partial enlarged view (a) which shows the structure of the fin (louverless) 17 of the windward side heat exchanger 11 and the structure of the fin (with louver) 17 of the leeward side heat exchanger 12 in the heating / cooling air conditioner 1 of FIGS. It is the elements on larger scale which show (b). It is a partial photograph which shows an example of the structure of the fin (with louver) 17 and the flat heat exchange pipe | tube 18 of the leeward side heat exchanger 12 in the air conditioning air conditioner 1 of FIG.1 and FIG.2. It is a perspective view which shows the example of the other heat exchanger which can be used for the heat exchanger 10 for outdoor units in the air conditioning air conditioning apparatus 1 of FIG.1 and FIG.2.

  Hereinafter, an embodiment of the air-conditioning / air-conditioning apparatus of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to these. Moreover, in the following description, the same code | symbol is attached | subjected to the same or an equivalent part, and the overlapping description may be abbreviate | omitted. Since the drawings are for conceptual description of the present invention, dimensions, ratios or numbers may be exaggerated or simplified as necessary for easy understanding.

  1 and 2 are schematic configuration diagrams showing the structure of an air conditioning / air conditioning apparatus 1 according to an embodiment of the present invention. FIG. 1 shows a state during heating operation, and FIG. 2 shows a state during cooling operation. ing. Moreover, FIG. 3 is a schematic configuration diagram showing the windward side heat exchanger and the leeward side heat exchanger constituting the outdoor unit heat exchanger in the cooling / heating air conditioner 1 according to the present embodiment. It is a perspective view which shows a windward side heat exchanger and a leeward side heat exchanger.

  5 is a partially enlarged view (a) showing the structure of the fin (louverless) 17 of the windward side heat exchanger 11 and the fins of the leeward side heat exchanger 12 (in FIG. 1 and FIG. 2). FIG. 6 is a partially enlarged view (b) showing the structure of the louver 17 (shown from a direction substantially parallel to the length direction of the flat heat exchange pipe 16), and FIG. 6 is the air conditioning air conditioner of FIGS. 2 is a partial photograph showing an example of the structure of fins (with louvers) 17 and flat heat exchange tubes 18 of the leeward heat exchanger 12 in FIG. FIG. 7 is a perspective view showing an example of another heat exchanger that can be used for the outdoor unit heat exchanger 10 in the air conditioning air conditioner 1 of FIGS. 1 and 2.

  The air conditioning air conditioner 1 of this embodiment includes a compressor 5, an indoor unit heat exchanger 6, an outdoor unit heat exchanger 10, a first electronic expansion valve EV1, and a second electronic expansion valve EV2. Are provided. The outdoor unit heat exchanger 10 is face-to-face by serial connection of an upwind heat exchanger 11 disposed on the windward side with respect to the outdoor air passage 7 and a leeward heat exchanger 12 disposed on the leeward side. The blower fan 13 is disposed on the windward side of the windward side heat exchanger 11.

  Moreover, the 1st piping 21 which connects the compressor 5 and the indoor unit heat exchanger 6, and the 2nd piping which connects the compressor 5 and the leeward side heat exchanger 12 of the heat exchanger 10 for outdoor units. 22 is provided with a four-way valve DV, which is a switching valve. By switching the four-way valve DV, the high-temperature and high-pressure refrigerant discharged from the compressor 5 is configured to flow to the indoor unit heat exchanger 6 or the leeward heat exchanger 12 of the outdoor unit heat exchanger 10. Has been.

  The third pipe 23 that connects the indoor unit heat exchanger 6 and the upside heat exchanger 11 of the outdoor unit heat exchanger 10 has a first check valve CV1 and a first function that functions only during cooling. And an electronic expansion valve EV1. The fourth pipe 24 connecting the windward side heat exchanger 11 and the leeward side heat exchanger 12 is provided with a second check valve CV2 and a second electronic expansion valve EV2 that functions only during heating. It is installed.

  Here, as shown in FIG. 3, the windward side heat exchanger 11 and the leeward side heat exchanger 12 constituting the outdoor unit heat exchanger 10 of the present embodiment have shapes in which the entire surface area of both is substantially the same. And dimensions. That is, the width B of the windward side heat exchanger 11 and the leeward side heat exchanger 12 is substantially the same, and the height H of the windward side heat exchanger 11 and the leeward side heat exchanger 12 is also substantially the same. .

  And the windward side heat exchanger 11 and the leeward side heat exchanger 12 are all formed by a parallel flow type heat exchanger (PFC) made of an aluminum alloy. More specifically, as shown in FIGS. 3 and 4, the windward side heat exchanger 11 and the leeward side heat exchanger 12 are mainly composed of a pair of header pipes 14 and 15 made of aluminum alloy facing each other vertically. A plurality of flat aluminum alloy heat exchange tubes 16 (for example, formed of extruded shapes) communicating with the header pipes 14 and 15 and the adjacent flat heat exchange tubes 16 are interposed. And an aluminum alloy corrugated fin 17.

  The lower header pipe 15 of the windward side heat exchanger 11 is provided with a refrigerant inlet / outlet port 18a to which the third pipe 23 is connected, and the upper header pipe 14 of the windward side heat exchanger 11 has a fourth pipe 24. A refrigerant inlet / outlet port 18b to which one end of the refrigerant is connected is provided. On the other hand, the lower header pipe 15 of the leeward heat exchanger 12 is provided with a refrigerant inflow / outlet port 18c to which the other end of the fourth pipe 24 is connected, and the upper header pipe 14 of the leeward heat exchanger 11 has A refrigerant inlet / outlet port 18d to which the second pipe 22 is connected is provided.

  Further, the flat heat exchange pipe 16 is formed with a plurality of refrigerant passages (see FIGS. 5 and 6 to be described later). The upper header pipe 14 and the lower header pipe 15, the flat heat exchange pipe 16, and the corrugated fins 17 are integrally formed, for example, by brazing.

  Next, in the cooling / heating air conditioner 1 of the present embodiment, in the windward side heat exchanger 11, the corrugated fins 17a disposed between the flat heat exchange tubes 16 are flat as shown in FIG. In contrast, the leeward heat exchanger 12 is disposed between the flat heat exchange tubes 16 as shown in FIG. 5B and FIG. The corrugated fin 17b is flat and has a shape (with a louver) in which a large number of slit-shaped openings 17c are provided in parallel.

With such a structure, the ventilation resistance R ₁ of the leeward heat exchanger 11 is set to be smaller than the ventilation resistance R _{2 of the} leeward heat exchanger 12. The ventilation resistance has substantially the same meaning as the pressure loss in general, and when the ventilation resistance R ₁ of the windward side heat exchanger 11 is equal to or larger than the ventilation resistance R _{2 of the} leeward side heat exchanger 12, the leeward side The air volume supplied to the heat exchanger 12 tends to decrease, and the heat exchange performance tends to be impaired. Therefore, in the present embodiment, as described above, the ventilation resistance R ₁ of the windward side heat exchanger 11 is set to be smaller than the ventilation resistance R _{2 of the} leeward side heat exchanger 12, and the outside air A flowing through the outside air ventilation path 7. The pressure loss received by the windward side heat exchanger 11 is reduced, and the deterioration of the heat exchange performance is effectively suppressed.

  Regarding the unit of ventilation resistance, “Pa (AF−0.5 m / sec)” means the ventilation resistance when the passing wind speed is 0.5 m / sec, and “Pa (AF-1. “5 m / sec)” means a ventilation resistance when the passing wind speed is 1.5 m / sec. The passing wind speed in the present embodiment is determined in the range of 0.5 to 3.0 m / sec, preferably in the range of 0.5 to 1.5 m / sec in consideration of the balance between heat exchange performance and quietness. do it.

More specifically, the pressure loss of the air flowing from the windward side heat exchanger 11 to the leeward side heat exchanger 12 can be reliably reduced, the heat exchange performance can be improved, and the function of the air conditioner / air conditioner 1 can be improved. From the viewpoint that it can be more reliably exhibited, for example, the ventilation resistance R ₁ of the windward side heat exchanger 11 is set to 2 Pa (AF-0.5 m / sec) to 14 Pa (AF-3.0 m / sec), it is preferable to set the ventilation resistance R ₂ of the leeward side heat exchanger 12 to 3Pa (AF-0.5m / sec) ~28Pa (AF-3.0m / sec). Furthermore, the ventilation resistance R ₁ of the leeward heat exchanger 11 is set to 2 Pa (AF−0.5 m / sec) to 14 Pa (AF−1.5 m / sec), and the ventilation resistance R of the leeward heat exchanger 12 is set. ₂ is preferably set to 3 Pa (AF-0.5 m / sec) to 28 Pa (AF-1.5 m / sec).

The airflow resistance is the pitch of the corrugated fins 17 (fp: distance between peaks and valleys), and the core thicknesses of the windward side heat exchanger 11 and the leeward side heat exchanger 12 (thickness of the portion serving as the core, in the present embodiment). It can also vary depending on the width of the flat heat exchange tube 16. For example, the core thickness is 14, 16, 19 or 21 mm, and fp is appropriately selected in the range of 1.0 to 2.5, but depending on these selected specific values, the windward side heat exchanger 11 the ventilation resistance R ₁ and the ventilation resistance R ₂ of the leeward side heat exchanger 12, may be set to the above range of airflow resistance.

  Further, in the present embodiment, as described above, the windward heat exchanger 11 and the leeward heat exchanger 12 are formed by a parallel flow heat exchanger, so that the heat transfer fins as shown in FIG. Since the thickness can be reduced as compared with the fin-and-tube heat exchanger 102 in which a plurality of rows of meandering heat transfer tubes 104 are passed through 103, the installation space of the heat exchanger for the outdoor unit can be reduced. Can do. However, as a modification, the leeward heat exchanger 12 may be a fin-and-tube heat exchanger having a structure as shown in FIG.

  When comparing parallel flow heat exchangers and fin-and-tube heat exchangers with the same heat exchange performance, parallel flow heat exchangers are compared to fin-and-tube heat exchangers. The thickness dimension can be halved.

  For example, the diameters of the upper header pipe 14 and the lower header pipe 15 of the windward side heat exchanger 11 and the leeward side heat exchanger 12 are set to 25 mm, and the thickness (core thickness) of the flat heat exchange pipe 16 is set to 2 mm. In a parallel flow heat exchanger in which the pitch (fp) of 16 is 10 mm, the thickness of the core can be about 20 mm.

  On the other hand, in a fin-and-tube heat exchanger having equivalent heat exchange performance, in general, when the diameter of the meandering heat transfer tube 104 is 6 to 9 mm and arranged in a line, the core thickness is 25 mm or more. When the meandering heat transfer tube 104 is 2, the core thickness can be about 34 mm.

  In the above embodiment, both the upwind heat exchanger 11 and the downwind heat exchanger 12 are parallel flow type heat exchangers made of aluminum alloy having an upper header pipe 14 and a lower header pipe 15 facing each other up and down. However, the upwind heat exchanger 11 may be an aluminum alloy parallel flow heat exchanger having header pipes facing left and right.

Moreover, the distance W (refer FIG.1 and FIG.2) of the leeward side heat exchanger 11 and the leeward side heat exchanger 12 in this embodiment should just be 5-50 mm. If the distance W between the windward side heat exchanger 11 and the leeward side heat exchanger 12 is 5 mm or more, the air flowing from the windward side heat exchanger 11 to the leeward side heat exchanger 12 is agitated, which is sufficiently difficult. The frosting effect can be ensured, and the space in the air conditioning / air conditioning apparatus 1 is not taken too much. In particular, the present inventors have confirmed through experiments that the heat exchange performance is substantially constant and does not change when the distance W exceeds 50 mm. The distance W between the windward side heat exchanger 11 and the leeward side heat exchanger 12 is preferably 10 to 50 mm, and more preferably 30 to 50 mm.
In addition, it is preferable that the windward side heat exchanger 11 and the leeward side heat exchanger 12 are attached to the frame of the outdoor unit and have a vibration isolation effect as in the conventional case.

  Next, operation | movement of the air conditioning air conditioner 1 of this embodiment which has the above structures is demonstrated with reference to FIGS. 1-3.

(1) During heating operation During heating operation, the high-temperature and high-pressure refrigerant discharged from the compressor 5 is changed to the first pipe 21 → by switching the four-way valve DV as indicated by arrows in FIGS. Indoor unit heat exchanger 6 → third pipe 23 → first check valve CV1 → upward heat exchanger 11 → fourth pipe 24 → second electronic expansion valve EVb → downward heat exchanger 12 → It circulates in order of the 2nd piping 22-> compressor 5.

  In this heating operation, since the high-temperature refrigerant discharged from the indoor unit heat exchanger 6 flows through the windward heat exchanger 11 and then flows into the leeward heat exchanger 12, the leeward heat exchanger 12 includes: The outside air warmed by the upwind heat exchanger 11 is blown. Therefore, defrosting of the windward side heat exchanger 11 and the leeward side heat exchanger 12 can be performed during heating operation, and the occurrence of frost formation can be suppressed.

Further, since the ventilation resistance R ₁ of the windward side heat exchanger 11 is smaller than the ventilation resistance R _{2 of the} leeward side heat exchanger 12, the pressure loss of the outside air A flowing through the outside air ventilation path 7 can be reduced, and the windward side heat can be reduced. The pressure loss of the refrigerant flowing through the exchanger 11 and the leeward heat exchanger 12 can be reduced, and the deterioration of the heat exchange performance can be reliably suppressed.

(2) During cooling operation During cooling operation, the high-temperature and high-pressure refrigerant discharged from the compressor 5 is switched from the second pipe 22 to the leeward side heat by switching the four-way valve DV as indicated by the arrows in FIG. Exchanger 12 → fourth piping 24 → second check valve CV2 → upstream heat exchanger 11 → third piping 23 → first electronic expansion valve EV1 → heat exchanger 6 for indoor unit → first It circulates in order of piping 21-> compressor 5.

  During this cooling operation, the refrigerant that is not decompressed is sent from the leeward heat exchanger 12 to the leeward heat exchanger 11 via the second check valve CV2, and the outside air A flowing through the outside air passage 7 is also sent. Since the pressure loss of the refrigerant flowing through the leeward heat exchanger 12 and the leeward heat exchanger 11 is also small, it is possible to reliably suppress the deterioration of the heat exchange performance of the outdoor unit heat exchanger 10.

1 ... Air conditioning unit
5 ... Compressor,
6 ... indoor unit heat exchanger,
7: Open air ventilation path,
10 ... heat exchanger for outdoor unit,
11 ... windward heat exchanger,
12 ... leeward heat exchanger,
13 ... Blower fan,
14 ... Upper header pipe,
15 ... Lower header pipe,
16 ... flat heat exchange tube,
17 ... corrugated fin,
17a ... corrugated fin (louverless),
17b ... corrugated fin (with louver),
17c ... opening,
18 ... flat heat exchange tube,
21 ... first piping,
22 ... second piping,
23 ... third piping,
A ... Open air,
CV1 ... first check valve,
CV2 ... second check valve,
DV: Four-way valve,
EV1 ... first electronic expansion valve,
EV2 ... Second electronic expansion valve.

Claims (5)

A windward side heat exchanger and a leeward side heat exchanger that have a compressor and a heat exchanger for indoor units, and are arranged side by side in series on the windward side and the leeward side of the outdoor air passage by serial connection. Used as a heat exchanger for heating, high-temperature refrigerant flows to the leeward heat exchanger during heating, then low-temperature refrigerant due to adiabatic expansion flows to the leeward heat exchanger, and during cooling, the high-temperature refrigerant flows to the leeward side A heating and cooling air conditioner having a configuration in which the heat exchanger and the windward heat exchanger flow in this order,
At least the upwind heat exchanger includes a pair of aluminum header pipes facing each other vertically, a flat aluminum heat exchange pipe parallel to each other communicating with the pair of header pipes, and an adjacent flat heat exchange pipe A parallel flow heat exchanger composed of aluminum fins interposed between
The distance between the windward side heat exchanger and the leeward side heat exchanger is 5 to 50 mm,
Air-conditioning air conditioner characterized by.   Each of the windward side heat exchanger and the leeward side heat exchanger includes a pair of aluminum header pipes facing up and down, and flat aluminum heat pipes that are parallel to each other and communicate with the pair of header pipes. The air-conditioning / air-conditioning apparatus according to claim 1, wherein the air-conditioning / air-conditioning apparatus is a parallel flow type heat exchanger composed of aluminum fins interposed between adjacent flat heat exchange tubes. The distance between the windward side heat exchanger and the leeward side heat exchanger is 10 to 50 mm;
The air conditioning air conditioning apparatus according to claim 1 or 2. The distance between the windward side heat exchanger and the leeward side heat exchanger is 30 to 50 mm,
The air conditioning air conditioning apparatus according to claim 1 or 2. A pipe connecting the indoor unit heat exchanger and the upwind heat exchanger has a first check valve that passes the refrigerant during heating, and a first valve that functions only during cooling and passes the refrigerant without reducing pressure. 1 expansion valve is interposed in parallel,
A second check valve that allows the refrigerant to pass during cooling, and a second valve that functions only during heating and passes the refrigerant without reducing pressure, to a pipe connecting the windward heat exchanger and the leeward heat exchanger. The expansion valve of
The air conditioning air conditioning apparatus according to any one of claims 1 to 4.