JP2001108258A - Air heat-exchanger and air-conditioner having the air heat-exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a higher performance air heat-exchanger and an air- conditioner having the air heat-exchanger by effectively using the property of a refrigerant R32. SOLUTION: In an air heat-exchanger constituted such that a transfer pipe 2 through which a refrigerant flows is mounted on a plurality of fins 11, 11,..., R32 is used as a refrigerant. In this constitution, from a property where a heat transfer coefficient is high and a latent heat of vaporization is high, performance is further increased and a refrigerant is further saved through the decrease of the diameter of the heat transfer pipe 2. From a property that the R32 is a high pressure refrigerant and a temperature loss due to a pressure loss is low, high heat-exchange performance is provided regardless of the decrease of the diameter of the heat transfer pipe 2. Further, from a property that the R32 is high in a heat transfer efficiency at the low degree of dryness, simplification of the structure of the air heat-exchanger and reduction of a cost are promoted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air heat exchanger and an air conditioner provided with the same.

[0002]

2. Description of the Related Art In an air heat exchanger used in an air conditioner, a heat transfer tube is reduced in diameter to promote heat transfer efficiency on the heat transfer tube side and to increase fin efficiency, thereby improving performance and saving refrigerant. It is known to achieve this.

On the other hand, as a refrigerant for an air heat exchanger,
Conventionally, it has been customary to use “R22” which is a HCFC-based Freon refrigerant.

[0004]

However, reducing the diameter of the heat transfer tube has advantages such as enhancement of heat transfer efficiency on the heat transfer tube side. Since the performance is lowered, it is restricted to a certain level in consideration of the heat exchange performance, and therefore, there is still dissatisfaction in terms of improving the performance of the air heat exchanger and saving the refrigerant.

[0005] As a refrigerant for an air heat exchanger, "R2
When "2" is used, since "R22" has the property of having a low heat transfer coefficient at low dryness (see FIG. 11), in order to suppress a decrease in performance at low dryness, For example, it is necessary to take measures such as branching the heat transfer tube in the middle of the tube to promote heat transfer. Therefore, there is a problem that the structure of the air heat exchanger becomes complicated and the cost increases.

Accordingly, the present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide a higher-performance air heat exchanger and an air conditioner having the same.

[0007]

BACKGROUND OF THE INVENTION The inventors of the present application paid attention to the properties of "R32" as a single HFC-based refrigerant in the course of studying means for solving the problems.

That is, according to the tests of the present inventors, R32 has (a) a high heat transfer coefficient and a large latent heat of vaporization, and (b) a high-pressure refrigerant having a temperature loss due to pressure loss. (C) High heat transfer coefficient at low dryness compared to “R22” (see FIG. 11).

[0009] Since these properties are considered to contribute to the improvement of the heat exchange performance, the inventors of the present application referred to the "R3
The present invention has been made to obtain a higher-performance air heat exchanger and an air conditioner provided with the same by effectively utilizing the properties specific to "2".

[0010]

Based on this technical background, the present invention employs the following configuration as specific means for solving the above-mentioned problems.

In the first invention of the present application, the plurality of fins 1
An air heat exchanger configured by attaching a heat transfer tube 2 through which a refrigerant flows to 1, 11,... Is characterized in that "R32" is used as the refrigerant.

According to a second aspect of the present invention, in the air heat exchanger according to the first aspect, the diameter of the heat transfer tube 2 is set to:
It is characterized in that the diameter is set smaller than the pipe diameter when "R22" is used as the refrigerant.

According to a third aspect of the present invention, in the air heat exchanger according to the first aspect, the heat transfer tube 2 has a one-pass structure that communicates with a single tube from the refrigerant inlet 2a to the refrigerant outlet 2b. It is characterized by.

In the air heat exchanger according to a fourth aspect of the present invention, the air heat exchanger according to the first, second or third aspect is appropriately combined in accordance with a required heat exchange capacity or a required form. It is characterized by doing.

According to a fifth aspect of the present invention, in the air conditioner including a heat exchanger and a fan, the air heat exchanger according to claim 1, 2, 3, or 4 is used as the heat exchanger. It is characterized by using.

[0016]

According to the present invention, the following effects can be obtained by adopting such a configuration.

In the air heat exchanger according to the first invention of the present application, in the air heat exchanger configured by attaching the heat transfer tube 2 through which the refrigerant flows to the plurality of fins 11, 11,. "R32" is used. Therefore, this "R32" is used as a refrigerant of an air heat exchanger,
In addition, the following specific effects can be obtained by functionally combining the properties of the “R32” with the configuration of the air heat exchanger.

That is, since "R32" has a property that the heat transfer coefficient is higher and the latent heat of evaporation is larger than that of "R22", an air heat exchanger using "R32" as a refrigerant and "R22" as a refrigerant. When applied as a refrigerant for an air heat exchanger having the same capacity as that of the above, the pressure loss can be suppressed by reducing the flow rate of the refrigerant. Therefore, for example, the tube diameter of the heat transfer tube 2 can be set smaller than that in the case where “R22” is used as the refrigerant, and further reduction in the diameter of the heat transfer tube 2 allows the air heat exchanger to be further improved. High performance and refrigerant saving can be achieved.

Further, since “R32” is a high-pressure refrigerant and has a property that the temperature loss due to pressure loss is small, the use of “R32” as the refrigerant makes it possible to reduce the pressure by reducing the diameter of the heat transfer tube 2, for example. Even in the case where the loss increases, the decrease in the amount of heat exchange is suppressed, and high heat exchange performance is obtained.

Further, since “R32” has a property that the heat transfer coefficient at a low dryness is higher than that of “R22”, by using “R32” as a refrigerant, for example, a low refrigerant is used. As in the case of using "R22" having a low heat transfer coefficient in the dryness, it is not necessary to form the heat transfer tube with a branch structure in order to suppress a decrease in performance at the low dryness. Simplification of the structure and cost reduction are promoted.

As described above, according to the air heat exchanger according to the first aspect of the invention, by using "R32" as the refrigerant, the high performance, the refrigerant saving and the simplification of the structure can be simultaneously realized. It is possible.

In the air heat exchanger according to the second invention of the present application, in the air heat exchanger according to the first invention, the tube diameter of the heat transfer tube 2 is changed to a case where “R22” is adopted as a refrigerant. The diameter is set smaller than the diameter. In this case, by using “R32” as the refrigerant, the pressure loss of the refrigerant due to the reduction in the diameter of the heat transfer tube 2 is suppressed, and the effect based on the reduction in the diameter of the heat transfer tube 2, that is, the heat transfer tube The heat transfer efficiency of the air heat exchanger is enhanced and the fin efficiency is improved by narrowing the fin pitch, thereby improving the performance of the air heat exchanger and saving the refrigerant.

In the air heat exchanger according to the third invention of the present application, in the air heat exchanger according to the first invention, the heat transfer tube 2 is connected by one pipe from the refrigerant inlet 2a to the refrigerant outlet 2b. It has a one-pass structure. in this case,
By using “R32” as the refrigerant, “R32” can be used as the refrigerant.
22 ", the heat transfer coefficient is prevented from lowering at a low dryness. Therefore, the effect of the heat transfer tube 2 having a one-pass structure, that is, the structure of the air heat exchanger can be reduced. Simplification and cost reduction can be reliably obtained.

[0024] In the air heat exchanger according to a fourth invention of the present application, the air heat exchanger according to the first, second or third invention is replaced with the required heat exchange capacity or required form of the air heat exchanger. Therefore, for example, as compared with the case where the air heat exchanger is integrally formed in accordance with the required heat exchange capacity or the required form, freedom in designing the air heat exchanger can be improved. It is expected that the cost will be reduced by improving the degree of design and the number of design steps.

According to the air conditioner according to the fifth invention of the present application, in the air conditioner including a heat exchanger and a fan, the heat exchanger is used as the heat exchanger.
Since the air heat exchanger described in 3 or 4 is used, an air conditioner having a high air conditioning capacity and a simple structure can be provided at a lower cost.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be specifically described based on preferred embodiments.

FIGS. 1 to 4 show the module according to the present invention.
Heat exchange module M ₁~ M_FourShows
You. 6 and 7 show the heat exchange module M
Heat exchanger Z constituted by appropriately combining₁, Z_TwoTo
Is shown. 8 to 10 show the air heat exchange.
Air conditioner X configured with heat exchanger Z₁~ X_ThreeShow
I have. Hereinafter, these heat exchange modules and air heat exchangers
The configuration and the like of each of the air conditioners will be described.

Incidentally, each heat exchange module in this embodiment and the air heat exchanger obtained by combining them are as follows:
Both are based on the premise that "R32" is used as the refrigerant, and under such a premise, a unique configuration is provided in consideration of this in order to effectively utilize the properties of "R32".

A: Heat Exchange Module The heat exchange module constitutes the air heat exchanger according to the first to third aspects. Here, the following four structural examples are shown.

A-1: First Structure Example FIG. 1 shows a heat exchange module M _{1 according to a} first structure example .
Is shown. The heat exchange module M ₁ has a plurality of fins 11 and 11, the fin group 1 formed by opposed the ... at predetermined intervals, the fins 11, 11 of the fin group 1, &
And a heat transfer tube 2 which is attached in a direction of its plate thickness. In this case, in the heat exchange module M _1, taking into account that the "R32" is adopted as the refrigerant flowing through the heat transfer tube 2, the tube diameter of the heat transfer tube 2, as a refrigerant "R22" Is set smaller than the pipe diameter when the
Has a one-pass structure in which a single pipe extends in a meandering manner from a refrigerant inlet 2a located at a lower portion to a refrigerant outlet 2b located at an upper portion.

In FIG. 1, among the heat transfer tubes 2, only the refrigerant inlet 2a, the refrigerant outlet 2b, and the U-shaped tube portion, which are exposed at the front end face of the fin group 1, are shown by solid lines.
The U-shaped tube portion that penetrates through the fin group 1 and is exposed at the rear end face of the fin group 1 is indicated by a broken line on the front end face for convenience of drawing.

Here, the reason why the tube diameter of the heat transfer tube 2 is set smaller than the tube diameter when "R22" is adopted as the refrigerant is that "R32" has a higher heat transfer coefficient than "R22". Is high and the latent heat of vaporization is large, so that the same performance as in the case of employing "R22" can be obtained with a smaller refrigerant flow rate, and the pressure loss due to the smaller diameter can be reduced by the smaller refrigerant flow rate; and “R32” is a high-pressure refrigerant based on the fact that the temperature loss due to pressure loss is small.

The reason why the heat transfer tube 2 has a one-pass structure is that “R32” has a higher heat transfer coefficient at a low dryness than “R22”, and therefore “R22” is used. This is based on the fact that there is no need to form a heat transfer tube with a branch structure in order to suppress the performance deterioration due to the low heat transfer coefficient at low dryness.

The heat exchange module M configured as described above
_{In 1} , high heat exchange performance is obtained by reducing the diameter of the heat transfer tube 2, and simplification of the structure is promoted by forming the heat transfer tube 2 into a one-pass structure.

In the first structure example, as described above, the heat transfer tube 2 is formed of a small-diameter tube, and the arrangement structure is a one-pass structure (that is, the heat transfer tube 2).
In another example of the structure, for example, the heat transfer tube 2 is formed of a small-diameter tube and the arrangement structure is a multiple-pass structure. It is also possible to adopt a configuration in which only the arrangement structure of the heat transfer tube 2 is a one-pass structure while maintaining the same tube diameter as in the case of “R22” without reducing the diameter.

A-2: Second Structure Example FIG. 2 shows a heat exchange module M _{2 according to} the second structure example .
Is shown. This heat exchange module M ₂
In the heat exchange module M1 according to the structural example ( ₁₎ , the heat transfer tubes 2 are arranged in one line, whereas the heat transfer tubes 2 are arranged in two lines. That is, this heat exchange module M
₂ has a pair of fin groups 1 and 1 arranged before and after in the blowing direction and a refrigerant inlet 2a set at a lower part of one fin group 1 and a refrigerant outlet 2b set at a lower part of the other fin group 1. One heat transfer tube 2 is arranged in a meandering manner in the up-down direction with a straddle therebetween.

Also in this heat exchange module M ₂ , similarly to the heat exchange module M ₁ of the first structural example, considering that “R32” is used as the refrigerant flowing in the heat transfer tube 2, The diameter of the heat transfer tube 2 is set as “R
The diameter of the heat transfer tube 2 is set to be smaller than that of the case where "22" is adopted, and the heat transfer tube 2 has a one-pass structure. Also,
The reason why the diameter of the heat transfer tube 2 is reduced and the arrangement thereof is a one-pass structure is as described in the first structure example.

The heat exchange module M configured as described above
_In No. 2, high heat exchange performance is obtained by reducing the diameter of the heat transfer tube 2, and simplification of the structure is promoted by forming the heat transfer tube 2 into a one-pass structure.

In the second structure example, as described above, the heat transfer tube 2 is formed of a small-diameter tube, and the arrangement structure is a one-pass structure (ie, the heat transfer tube 2).
As described in the first example of the structure, for example, the heat transfer tube 2
Is made of a small-diameter tube and its arrangement structure is a multi-pass structure, or "R2 without reducing the diameter of the heat transfer tube 2".
Needless to say, it is also possible to adopt a one-pass structure in which only the arrangement structure is maintained while maintaining the same tube diameter as in the case of "2".

A-3: Third Structure Example FIG. 3 shows a heat exchange module M _{3 according to} the third structure example .
Is shown. This heat exchange module M ₃
A modification of the heat exchange modules M ₂ according to the structure of, whereas in the heat exchanger module M ₂ of the structural example of the second was equipped with a pair of fin groups 1,1, wide fin It is provided with only one fin group 1 composed of 11, 11,.

Other structures and the like are all the same as in the case of the above-described second structure example. Therefore, the description of the second structure example will be omitted here, and the description thereof will be omitted.

A-4: Fourth Structure Example FIG. 4 shows a heat exchange module M _{4 according to a} fourth structure example .
Is shown. This heat exchange module M ₄
In the heat exchange module M1 according to the structural example ( ₁₎ , the heat transfer tubes 2 are arranged in one line, whereas the heat transfer tubes 2 are arranged in three lines. That is, this heat exchange module M
Reference numeral ₄ designates the three fin groups 1, 1, 1 arranged side by side in the blowing direction and the refrigerant inlet 2a set at the lower part of the fin group 1 located at one end side in the juxtaposition direction and located at the other end side in the juxtaposition direction. One heat transfer tube 2 is arranged in a meandering manner in the vertical direction so as to straddle a refrigerant outlet 2b set on the upper part of the fin group 1.

Also in this heat exchange module M ₄ , similarly to the heat exchange module M ₁ of the first structural example, considering that “R32” is used as the refrigerant flowing in the heat transfer tube 2, The diameter of the heat transfer tube 2 is set as “R
The diameter of the heat transfer tube 2 is set to be smaller than that of the case where "22" is adopted, and the heat transfer tube 2 has a one-pass structure. Also,
The reason why the diameter of the heat transfer tube 2 is reduced and the arrangement thereof is a one-pass structure is as described in the first structure example.

The heat exchange module M thus configured
_In No. ₄ , high heat exchange performance is obtained by reducing the diameter of the heat transfer tube 2, and simplification of the structure is promoted by forming the heat transfer tube 2 into a one-pass structure.

A-5: Relationship between Heat Exchange Modules As described above, the heat exchange modules M _{1 to} M ₄ basically differ only in the number of rows of the heat transfer tubes 2. By obtaining heat exchange modules with different heat exchange capacity,
As described below, in order to expand the combination pattern when configuring an air heat exchanger by appropriately combining these heat exchange modules, and to facilitate the combination of the heat exchange modules according to the required capacity of the air heat exchanger. It is.

B: Air Heat Exchanger The air heat exchanger corresponds to the air heat exchanger according to claim 4, and as described above, the respective heat exchange modules M are appropriately selected and combined. By doing so, a product corresponding to the required heat exchange capacity, required form, and the like can be obtained. Here, for convenience of explanation, a case where only the heat exchange module shown in FIG. 5, that is, only the heat exchange module M _{3 according} to the third structural example shown in FIG. 3 is used,
The air heat exchanger obtained by selecting the combination number and combination form of the heat exchange modules M _3, it will be described below two embodiments.

B-1: First Embodiment FIG. 6 shows an air heat exchanger Z _{1 according} to a first embodiment. The air heat exchanger Z ₁ is a those composed by arranging a plurality on a plane of the heat exchange module M ₃ vertically (or transversely), the installation number of the heat exchange module M ₂ is air heat the heat exchange capacity required as exchanger Z ₁ is a member selected correspondingly.

The installation form of each of the heat exchange modules M ₂ is set in accordance with the required form of the air heat exchanger Z ₁ . That is, as in this example, forms suitable for the respective heat exchange modules air heat exchanger Z ₁ comprised of M ₂ are arranged on a plane is applied as a heat exchanger, for example whereas the suction of the outdoor unit It is. Further, formed by laminating a plurality of heat exchange modules M ₂ in multiple stages in the vertical direction as shown in FIG. 6, and a bent planar form by further inclined sequentially longitudinal direction respective heat exchange modules M ₂ are, for example, as shown in FIG. 9, it is preferable to apply the heat exchanger Z of the indoor unit X ₂ wall mounted.

[0049] Thus, when combined appropriately selecting the heat exchange module to obtain the air heat exchanger Z _1, for example as compared with the case of integrally forming the air heat exchanger Z _1, it is easy to correspond to the required heat exchanger capacity or request form as the air heat exchanger Z _1, it is much increased degree of freedom in designing the air heat exchanger, and by extension also cost reduction by reducing the number of design processes expectations You can do it.

B-2: Second Embodiment FIG. 7 shows an air heat exchanger Z _{2 according} to a second embodiment. The air heat exchanger Z ₂ are those planarly arrayed a plurality of heat exchange modules M ₃ in the vertical direction and arranged laterally at a predetermined angle, a substantially L-shaped or substantially U-shape as a whole It is configured so as to have a plan view form (not shown) or a substantially rectangular shape (not shown). And, for example, the air heat exchanger Z having a substantially L-shape is
Heat exchanger Z bidirectional suction type outdoor unit X ₁ as shown in FIG. 8
The air heat exchanger Z having a substantially square shape is suitable for use as a heat exchanger Z of a ceiling-arranged indoor unit as shown in FIG.

The advantages of the first embodiment are that the heat exchange modules are appropriately selected and combined to obtain an air heat exchanger, thereby improving the degree of freedom of design of the air heat exchanger and reducing costs by reducing the number of design steps. Is the same as

C: Air Conditioner FIG. 8 shows an air conditioner to which the above air heat exchanger is applied.
The bidirectional suction type outdoor unit X ₁ to a wall-mounted indoor unit X ₂ in FIG. 9, FIG. 10 the ceiling type indoor unit X _3, are shown respectively.

The outdoor unit X ₁ shown in FIG. 8 includes an air heat exchanger Z having a substantially L-shaped bent shape so as to face two suction ports 23 provided on two surfaces of a casing 21. The fan 22 is disposed so as to face the air outlet 24.
And the air conditioner X
As the air heat exchanger Z in ₁ above, for example, an air heat exchanger configured by arranging two heat exchange modules M, M in a substantially L-shape is suitable.

The indoor unit X ₂ shown in FIG.
A plurality of suction ports 27 provided from the upper surface to the front surface of the
An air heat exchanger Z having a bent form is arranged to face each of 27, 27, and a fan 26 is arranged at the outlet 28 as desired. Then, as the air heat exchanger Z in this air conditioner X _2, for example, four heat exchange modules M, M, is an air heat exchanger constructed on site in the multi-stage bent shape of ... is suitable.

The indoor unit X ₃ shown in FIG.
9, a fan 30 is arranged at the center position, and an air heat exchanger Z having a substantially rectangular shape is arranged so as to surround the periphery of the fan 30. Then, the examples of the air heat exchanger Z in the air conditioner X _3, for example, four heat exchange modules M, M, is substantially square-shaped air heat exchanger configured by bending in the ... is suitable.

As described above, the air conditioners X _{1 to} X _1
3 adopts the air heat exchangers Z ₁ and Z ₂ which are constituted by appropriately combining the above heat exchange modules M _{1 to} M ₄ as the air heat exchanger Z. According to the features of the chambers Z ₁ and Z ₂ , they have the features of having a high air-conditioning capacity, simple structure, and low cost.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part showing a first structural example of a heat exchange module constituting an air heat exchanger.

FIG. 2 is a perspective view of a main part showing a second structural example of a heat exchange module constituting the air heat exchanger.

FIG. 3 is a perspective view of a main part showing a third structural example of a heat exchange module constituting the air heat exchanger.

FIG. 4 is a perspective view of a principal part showing a fourth structural example of a heat exchange module constituting the air heat exchanger.

FIG. 5 is a perspective view showing an overall form of a heat exchange module having a specific structure.

FIG. 6 is a perspective view showing a first embodiment of an air heat exchanger obtained by combining heat exchange modules.

FIG. 7 is a perspective view showing a second embodiment of the air heat exchanger obtained by combining the heat exchange modules.

FIG. 8 is a cross-sectional view of an outdoor unit of the air conditioner.

FIG. 9 is a longitudinal sectional view of a wall-mounted indoor unit of the air conditioner.

FIG. 10 is a cross-sectional view of a ceiling-mounted indoor unit of the air conditioner.

FIG. 11 is a characteristic diagram of “dryness-heat transfer coefficient” of a refrigerant.

[Explanation of symbols]

1 is a fin group, 2 is a heat transfer tube, 11 is a fin, 21 is a casing, 22 is a fan, 23 is an inlet, 24 is an outlet,
25 is a casing, 26 is a fan, 27 is a suction port, 28
Is an outlet, 29 is a casing, 30 is a fan, M and M
₁ ~M ₄ heat exchange module, X ₁ to X ₃ is an air conditioner, Z
And Z _{1 to} Z ₂ are air heat exchangers.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kazunari Kasai, 1304 Kanaokacho, Sakai City, Osaka Prefecture Daikin Industries, Ltd. Sakai Seisakusho Kanaoka Plant F-term (reference) 3L051 BE01 BE05 BF01 BF02

Claims (5)

[Claims] A plurality of fins (11), (11), ...
An air heat exchanger comprising a heat transfer tube (2) through which a refrigerant is circulated, wherein "R32" is used as the refrigerant. 2. The air heat exchanger according to claim 1, wherein a diameter of the heat transfer tube (2) is set to be smaller than a diameter of a case where “R22” is used as a refrigerant. 3. The air heat exchanger according to claim 1, wherein the heat transfer tube (2) has a one-pass structure that communicates with a single tube from a refrigerant inlet (2a) to a refrigerant outlet (2b). . 4. An air heat exchanger, wherein the air heat exchanger according to claim 1, 2 or 3 is appropriately combined in accordance with a required heat exchange capacity or a required form. 5. An air conditioner comprising a heat exchanger and a fan, wherein the air heat exchanger according to claim 1, 2, 3, or 4 is used as the heat exchanger. An air conditioner characterized in that: