JP2006064200A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger having high heat exchanging efficiency, preventing the deformation of heat transfer pipes, and having superior productivity. <P>SOLUTION: In this heat exchanger, a first heat transfer pipe comprising a first flow channel in which the first fluid flows, and a second heat transfer pipe comprising one or more second flow channels in which the second fluid flows, are thermally connected, and the first heat transfer pipe is mounted inside of the second heat transfer pipe. In this heat exchanger, an outer face of the first heat transfer pipe is kept into contact with the second heat transfer pipe. Further in this heat exchanger exchanging the heat, the first fluid and the second fluid are composed of materials different from each other. In this heat exchanger, water flows in the first flow channel of the first heat transfer pipe, and carbon dioxide flows in the second flow channel of the second heat transfer pipe. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an improvement of a heat exchanger using carbon dioxide or the like as a heat transfer body.

In recent years, heat exchangers using heat transfer materials such as carbon dioxide that have no fear of environmental destruction have attracted attention. In this type of heat exchanger, heat exchange is performed by bringing the heat transfer tube that flows the heat transfer member into contact with the heat transfer tube that flows the heat transfer member, so that the contact area between the heat transfer tubes is increased, and the heat transfer body is carbon dioxide. When the operating pressure is high, it is important to prevent deformation of the heat transfer tube through which the heat transfer body flows.
In order to solve the above problems, (1) a heat exchanger in which a heat transfer tube for flowing a heat transfer body is a flat tube and a heat transfer tube for flowing a heat transfer body is a flat multi-hole tube (for example, Patent Document 1), (2 There has been proposed a heat exchanger (for example, Patent Document 2) in which a heat transfer tube through which the heat transfer body flows is a fine tube.

JP 2002-107069 A JP 2002-122390 A

However, the heat exchanger of Patent Document 1 requires a complicated assembly process for holding the heat transfer tubes in contact with each other, and it is necessary to braze the heat transfer tubes to each other. The heat exchanger of Patent Document 2 processes the flow dividing portion of the fine tube. However, both of them are inferior in productivity. Furthermore, in the heat exchanger of patent document 2, since an air layer is formed between the flow paths of the fine tubes, there is a problem that the performance is inferior.
Accordingly, an object of the present invention is to provide a heat exchanger that prevents deformation of a heat transfer tube, has excellent heat exchange efficiency, and is excellent in productivity.

  The invention according to claim 1 is a first heat transfer tube provided with a first flow path through which a first fluid flows, and a second heat transfer tube provided with one or a plurality of second flow paths through which a second fluid flows. Are thermally connected, and the first heat transfer tube is disposed inside the second heat transfer tube.

  According to a second aspect of the present invention, there is provided a first heat transfer tube having a first flow path through which a first fluid flows, and a second heat transfer tube having one or a plurality of second flow paths through which a second fluid flows. Are thermally connected, and an outer surface of the first heat transfer tube is in contact with the second heat transfer tube.

  According to a third aspect of the present invention, there is provided a first heat transfer tube including a first flow path through which a first fluid flows, and a second heat transfer tube including one or a plurality of second flow paths through which the second fluid flows. Is a heat exchanger, wherein the first fluid and the second fluid are made of different materials and exchange heat.

  The invention according to claim 4 is characterized in that water flows in the first flow path of the first heat transfer tube and carbon dioxide flows in the second flow path of the second heat transfer tube. It is a heat exchanger of description.

  The heat exchanger of the present invention includes a first heat transfer tube having a first flow path through which a first fluid flows, and a second heat transfer tube having one or a plurality of second flow paths through which a second fluid flows. Since the first heat transfer tube is disposed inside the second heat transfer tube or the outer surface of the first heat transfer tube is in contact with the second heat transfer tube, the heat transfer tube has a high operating pressure. Even if the heat flows, the heat transfer tube does not deform, higher heat exchange efficiency is obtained, and productivity is excellent. Therefore, there is an industrially significant effect.

Hereinafter, the present invention will be specifically described with reference to the drawings.
FIG. 1A is a cross-sectional view showing a first embodiment of the heat exchanger of the present invention.
In the heat exchanger 4, for example, the first heat transfer pipe 1 including the first flow path for flowing water (heat transfer body) flows the second flow in which the high-temperature compressed carbon dioxide gas (heat transfer body) flows. The heat exchanger 4 is formed by being arranged and thermally connected inside the second heat transfer tube 2 provided with the passage 3. The outer peripheral cross-sectional shape of the 2nd heat exchanger tube 2 is a circle | round | yen, can be easily provided by the extrusion method etc. and is excellent in productivity.

  In the heat exchanger of the present invention, since the first heat transfer tube 1 is arranged and thermally connected inside the second heat transfer tube 2, the heat transfer between the first heat transfer tube and the second heat transfer tube is good. In addition, since the second heat transfer tube 2 through which a heat transfer body having a high operating pressure such as carbon dioxide flows is not easily deformed, high heat exchange efficiency can be obtained.

FIG. 1B is a cross-sectional view showing a second embodiment of the heat exchanger of the present invention.
In the heat exchanger 4, for example, the first heat transfer pipe 1 including the first flow path for flowing water (heat transfer body) flows the second flow in which the high-temperature compressed carbon dioxide gas (heat transfer body) flows. The heat exchanger 4 is formed by being arranged and thermally connected inside the second heat transfer tube 2 provided with the passage 3. In contrast to FIG. 1A, the second heat transfer tube 2 covers only the periphery of the first heat transfer tube 1 and the second flow path 3, so that the weight is reduced and the material cost can be reduced. Similar to FIG. 1 (a), it can be easily provided by an extrusion method or the like, and is excellent in productivity.

FIG. 1C is a cross-sectional view showing a third embodiment of the heat exchanger of the present invention.
In the heat exchanger 4, for example, the outer surface of the first heat transfer tube 1 including the first flow path for flowing water (heat transfer body) flows the high-temperature compressed carbon dioxide gas (heat transfer body). The heat exchanger 4 is formed by being thermally connected to the second heat transfer tube 2 having the two flow paths 3. In contrast to FIG. 1 (a), the second heat transfer tube 2 is thermally connected to a part of the periphery of the first heat transfer tube 1, thereby reducing the weight and maintaining the material cost while maintaining the heat exchange performance. Can be reduced. In this case, if the second heat transfer tube 2 is in contact with 60% or more of the outer surface of the first heat transfer tube 1, good thermal conductivity can be ensured.

  In the present invention, both the first heat transfer tube 1 and the second heat transfer tube 2 are made of a metal material having excellent thermal conductivity and workability, such as copper and aluminum, and having an appropriate strength.

  In this invention, since the 1st heat exchanger tube 1 flows water, it is calculated | required that it is excellent in corrosion resistance. Preferably it consists of copper or a copper alloy. As the first heat transfer tube 1, a heat transfer tube having an inner diameter of 5 to 15 mm and a wall thickness of 0.6 to 2 mm is usually used.

  In the heat exchanger of the present invention, the first fluid and the second fluid are made of different materials and exchange heat. Moreover, it consists of the same material and heat-exchanges.

  In the present invention, the second heat transfer tube 2 is preferably aluminum or an aluminum alloy excellent in extrusion workability. The number of the second flow paths 3 through which the high-temperature compressed carbon dioxide gas (heat transfer body) flows is preferably one or two or more, but it is desirable in terms of pressure resistance to increase the number and reduce the diameter. The number is suitably 3 or more and 10 or less. The second flow path 3 preferably has an inner diameter of 1 to 4 mm. If the inner diameter is less than 1 mm, the pressure loss becomes large, and if the inner diameter exceeds 4 mm, the tube becomes thick in order to obtain sufficient pressure strength, and space saving becomes difficult. The inner diameter is preferably 2 to 3 mm.

  In the heat exchanger manufacturing method of the present invention, a predetermined length is manufactured only for the second heat transfer tube 2 by a general extrusion method, and then the first heat transfer tube 1 is inserted into the second heat transfer tube 2 and pulled out. By processing, the 1st heat exchanger tube 1 and the 2nd heat exchanger tube 2 are stuck. As another method, the second heat transfer tube 2 is manufactured by an extrusion method in a shape divided into a plurality of parts, and then the second heat transfer tube 2 is disposed so as to cover the outside of the first heat transfer tube 1 and is drawn. Thus, the first heat transfer tube 1 and the second heat transfer tube 2 are brought into close contact with each other. As yet another method, there is a method in which the second heat transfer tube 2 is formed outside the first heat transfer tube 1 by a conform extrusion method without drawing.

(A)-(c) is a cross-sectional view which shows the 1st-3rd embodiment of the heat exchanger of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st heat exchanger tube 2 2nd heat exchanger tube 3 2nd flow path 4 Heat exchanger

Claims (4)

A first heat transfer tube including a first flow path through which the first fluid flows and a second heat transfer tube including one or more second flow paths through which the second fluid flows are thermally connected. The heat exchanger is characterized in that the first heat transfer tube is disposed inside the second heat transfer tube. A first heat transfer tube including a first flow path through which the first fluid flows and a second heat transfer tube including one or more second flow paths through which the second fluid flows are thermally connected. The heat exchanger is characterized in that an outer surface of the first heat transfer tube is in contact with the second heat transfer tube. A first heat transfer tube including a first flow path through which the first fluid flows and a second heat transfer tube including one or more second flow paths through which the second fluid flows are thermally connected. The heat exchanger is characterized in that the first fluid and the second fluid are made of different materials and exchange heat. 4. The heat exchanger according to claim 1, wherein water flows in the first flow path of the first heat transfer tube and carbon dioxide flows in the second flow path of the second heat transfer tube.

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