Radiation-convection heat exchanger and air conditioner having the same

Abstract

The present invention relates to a radiation-convection heat exchanger and an air conditioner having the same. Specifically, the radiation-convection heat exchanger includes: a radiation heat exchange part which is in a cylindrical shape with both ends open, configured to absorb heat or cold from its inner wall surface and radiate heat or cold to the outside from its outer wall surface; and a convection heat exchange part which is arranged inside the radiation heat exchange part, configured to generate heat or cold, transfer the heat or cold to the air flowing through the inside of the radiation heat exchange part, and transfer the heat or cold to the inner wall surface of the radiation heat exchange part; and the convection heat exchange part includes a refrigerant pipeline and a plurality of heat dissipation fins arranged on the refrigerant pipeline; each heat dissipation fin is a needle-shaped fin. It is possible to reduce the blowing feeling on the human body and increase the thermal comfort of the human body on the premise of ensuring the heating or cooling capacity.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration and heating, and particularly to a radiative-convective heat exchanger and an air conditioner having the same. Background Art

[0002] Existing air conditioner heat exchangers mainly heat or cool air in the form of forced convection heat transfer, and then transfer heat or cold to a room or a human body. However, this heat or cold transfer in the form of convection heat transfer will reduce the thermal comfort of the human body. Especially when higher heating or cooling capacity is required, the high-speed air blown out inside the air conditioner heat exchanger is extremely likely to cause thermal discomfort to the human body. Summary of the Invention

[0003] An object of the first aspect of the present invention is to overcome at least one defect of the existing heat exchanger, and to provide a radiative-convective heat exchanger, which can significantly reduce the thermal discomfort of the human body when exchanging heat with the human body or a room.

[0004] An object of the second aspect of the present invention is to provide an air conditioner having the above-mentioned radiative-convective heat exchanger.

[0005] According to the first aspect of the present invention, a radiative-convective heat exchanger is proposed, which includes:

[0006] A radiative heat transfer part, which is in the shape of a cylinder with two open ends, and is configured to absorb heat or cold from its inner wall surface and radiate heat or cold to the outside from its outer wall surface; and

[0007] A convective heat transfer part, which is arranged inside the radiative heat transfer part, and is configured to generate heat or cold, transfer heat or cold to the air flowing through the inside of the radiative heat transfer part, and transfer heat or cold to the inner wall surface of the radiative heat transfer part; and

[0008] The convective heat transfer part includes a refrigerant pipeline and a plurality of heat dissipation fins arranged on the refrigerant pipeline;

[0009] Each of the heat dissipation fins is a needle-shaped fin.

[0010] Optionally, the refrigerant pipeline includes a plurality of heat exchange plates; each heat exchange plate has a first edge and a second edge extending along the axial direction of the radiative heat transfer part; the first edge is arranged in the middle of the inner space of the radiative heat transfer part, and the second edge is connected to the inner wall surface of the radiative heat transfer part; the plurality of heat exchange plates are sequentially arranged along the circumferential direction of the radiative heat transfer part;

[0011] A plurality of the heat dissipation fins are arranged on both sides of each heat exchange plate.

[0012] Optionally, each of the heat exchange plates is disposed to intersect with the radial direction of the radiative heat exchange portion facing the second edge of the heat exchange plate; or

[0013] Each of the heat exchange plates extends along the axial direction of the radiative heat exchange portion and extends along the radial direction of the radiative heat exchange portion.

[0014] Optionally, each of the heat dissipation fins is perpendicular to the corresponding heat exchange plate.

[0015] Optionally, each of the heat exchange plates has a plurality of first refrigerant channels, and each of the first refrigerant channels extends along the axial direction of the radiative heat exchange portion, and

[0016] in each of the heat exchange plates, in the direction from the first edge to the second edge, the plurality of first refrigerant channels are arranged in sequence;

[0017] The cross-sectional profile of each of the first refrigerant channels is rectangular or circular.

[0018] Optionally, the refrigerant pipeline includes a plurality of coaxial cylindrical structures, and each of the cylindrical structures is coaxial with the radiative heat exchange portion;

[0019] The cylindrical structure includes at least one heat exchange cylinder, and one or more second refrigerant channels are provided on the cylinder wall of each of the heat exchange cylinders; and

[0020] A fin layer is provided between every two adjacent cylindrical structures, and each fin layer has a plurality of the heat dissipation fins.

[0021] Optionally, a fin layer is provided between the outermost cylindrical structure and the inner wall surface of the radiative heat exchange portion; or, the outer wall surface of the outermost cylindrical structure is integrally formed with or in contact with the inner wall surface of the radiative heat exchange portion;

[0022] The root of each of the heat dissipation fins is connected to the inner cylindrical structure.

[0023] Optionally, the convective heat exchange portion is an integrally processed part and is formed by an extrusion process; or,

[0024] The whole formed by the convective heat exchange portion and the radiative heat exchange portion is an integrally processed part and is formed by an extrusion process.

[0025] According to a second aspect of the present invention, the present invention further provides an air conditioner, including an evaporator and a condenser, and the evaporator and / or the condenser adopts any one of the above radiative-convective heat exchangers.

[0026] In the radiative-convective heat exchanger and the air conditioner of the present invention, since there are a radiative heat exchange part and a convective heat exchange part, the cylindrical radiative plate undertakes part of the heating or cooling load, which can reduce the blowing feeling on the human body and increase the thermal comfort of the human body on the premise of ensuring the heating or cooling capacity; especially during winter heating, the radiative heat exchange can significantly increase the thermal comfort of the human body.

[0027] From the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more clearly aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Some specific embodiments of the present invention will be described in detail hereinafter with reference to the accompanying drawings in an exemplary but not restrictive manner. The same reference numerals in the drawings denote the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0029] Figure 1 is a schematic cross-sectional view of a radiative-convective heat exchanger according to an embodiment of the present invention;

[0030] Figure 2 is a schematic cross-sectional view of a partial structure of a radiative-convective heat exchanger according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] Figure 1 is a schematic cross-sectional view of a radiative-convective heat exchanger according to an embodiment of the present invention. As Figure 1 shown, an embodiment of the present invention provides a radiative-convective heat exchanger, including a radiative heat exchange part 20 and a convective heat exchange part 30. The radiative heat exchange part 20 is in a cylindrical shape with both ends open, and is configured to absorb heat or cold from its inner wall surface and radiate heat or cold to the outside from its outer wall surface. For example, the outer contour of the cross-section of the radiative heat exchange part 20 is circular, semi-circular, square or fan-shaped. The convective heat exchange part 30 is disposed inside the radiative heat exchange part 20, and is configured to generate heat or cold, and transfer the heat or cold to the air flowing through the inside of the radiative heat exchange part 20, and transfer the heat or cold to the inner wall surface of the radiative heat exchange part 20. The radiative heat exchange part 20 is located on the outer shell surface of the radiative-convective heat exchanger and can directly serve as the outer shell.

[0032] When the radiative-convective heat exchanger in the embodiment of the present invention is working, the convective heat exchange part 30 generates heat or cold, conducts heat exchange with the air inside the radiative heat exchange part 20, and conducts heat exchange with the inner wall surface of the radiative heat exchange part 20. The air after heat exchange can flow out of the radiative heat exchange part 20 and is used for indoor or human body warmth or cooling. The outer wall surface of the radiative heat exchange part 20 can radiate heat or cold outward and is used for indoor or human body warmth or cooling. The cylindrical radiation plate undertakes part of the heating or cooling load, can reduce the blowing feeling of the human body and increase the human body thermal comfort on the premise of ensuring the heating or cooling capacity; especially when heating in winter, the radiative heat exchange can significantly increase the human body thermal comfort.

[0033] Specifically, as Figure 1 and Figure 2 shown, the convective heat exchange part 30 includes a refrigerant pipeline and heat dissipation fins 35 arranged on the refrigerant pipeline. Each heat dissipation fin 35 is preferably a pin fin.

[0034] In some preferred embodiments of the present invention, as Figure 1 and Figure 2 shown, the refrigerant pipeline includes a plurality of heat exchange plates 31, and a plurality of first refrigerant channels 32 extending along the length direction or width direction of the heat exchange plate 31 are arranged in each heat exchange plate 31. There are a plurality of heat dissipation fins 35, which are installed on a plurality of heat exchange plates 31.

[0035] Furthermore, each heat exchange plate 31 has a first edge and a second edge extending along the axial direction of the radiative heat exchange part 20. The first edge is arranged in the middle of the inner space of the radiative heat exchange part 20, and the second edge is connected to the inner wall surface of the radiative heat exchange part 20. The plurality of heat exchange plates 31 are evenly distributed along the circumferential direction of the radiative heat exchange part 20. For example, in some embodiments, each heat exchange plate 31 extends along the axial direction of the radiative heat exchange part 20 and extends along the radial direction of the radiative heat exchange part 20, as Figure 1 shown. In some other embodiments, each heat exchange plate 31 is arranged crosswise with respect to the radial direction of the radiative heat exchange part 20 facing the second edge of the heat exchange plate 31.

[0036] In some embodiments of the present invention, a plurality of the heat dissipation fins 35 are provided on both sides of each heat exchange plate 31, and each heat dissipation fin 35 is perpendicular to the corresponding heat exchange plate 31. Optionally, there are a plurality of distance values for the intervals between two adjacent heat dissipation fins 35 among the plurality of heat dissipation fins 35 on each side of each heat exchange plate 31, so that the arrangement density of the plurality of heat dissipation fins 35 is unequal. For example, along the radial direction of the radiative heat exchange part 20, the plurality of distance values decrease in sequence, that is, the heat dissipation fins 35 are arranged from sparse to dense. Specifically, the plurality of heat dissipation fins 35 on each side of each heat exchange plate 31 are arranged in multiple groups. In the direction from the corresponding first edge to the second edge, each group of heat dissipation fins 35 has at least two rows of heat dissipation fins 35. The distance between every two adjacent rows of heat dissipation fins 35 in each group of heat dissipation fins 35 is equal to one of the above distance values, so that the interval size of the heat dissipation fins 35 on each side of each heat exchange plate 31 in the direction from the corresponding first edge to the second edge has a plurality of distance values. Adjacent two groups can share one row of heat dissipation fins 35, that is, grouping is carried out by using one row of shared heat dissipation fins 35.

[0037] Each first refrigerant channel 32 extends along the axial direction of the radiative heat exchange part 20. In each heat exchange plate 31, in the direction from the first edge to the second edge, a plurality of first refrigerant channels 32 are arranged in sequence. There is one or more spacing values for the interval size between two adjacent first refrigerant channels 32. The plurality of spacing values decrease in sequence. The plurality of first refrigerant channels 32 on each heat exchange plate 31 are arranged in multiple groups. Each group of first refrigerant channels 32 has at least two first refrigerant channels 32. The distance between every two adjacent first refrigerant channels 32 in each group of first refrigerant channels 32 is equal to one of the above spacing values, so that the interval size between the first refrigerant channels 32 on each heat exchange plate 31 has a plurality of spacing values. Adjacent two groups can share one first refrigerant channel 32, that is, grouping is carried out by using one shared first refrigerant channel 32.

[0038] The cross-sectional profile of each first refrigerant channel 32 is rectangular, circular or other regular or irregular shapes. Preferably, the cross-sectional profile of each first refrigerant channel 32 is rectangular or circular. The hydraulic radius of each first refrigerant channel 32 is 0.1 - 10 mm; the number of first refrigerant channels 32 on each heat exchange plate 31 is 10 - 50. The number of heat exchange plates 31 is 4 to 50. In some embodiments of the present invention, in the direction from the first edge to the second edge, there is one spacing between two adjacent first refrigerant channels 32, that is, the plurality of first refrigerant channels 32 are arranged at equal intervals.

[0039] In some other preferred embodiments of the present invention, the refrigerant pipeline of the convective heat exchange part 30 includes one or more coaxially arranged cylindrical structures, and each cylindrical structure is coaxially arranged with the radiative heat exchange part 20. The cylindrical structure includes at least one heat exchange cylinder, and one or more second refrigerant channels are provided on the cylinder wall of each heat exchange cylinder.

[0040] Further, the cylindrical structure may further include at least one support cylinder, and each support cylinder is disposed between two adjacent heat exchange cylinders, or on the inner side of the innermost heat exchange cylinder, or between the outermost heat exchange cylinder and the radiation heat exchange part 20.

[0041] In order to facilitate heat transfer between the convective heat exchange part 30 and the radiation heat exchange part 20, in some embodiments, a fin layer is provided between the outermost cylindrical structure and the inner wall surface of the radiation heat exchange part 20. In other embodiments, the outer wall surface of the outermost cylindrical structure is integrally formed with or in contact with the inner wall surface of the radiation heat exchange part 20. The outermost cylindrical structure is preferably a heat exchange cylinder. In some embodiments of the present invention, there are a plurality of cylindrical structures, and a fin layer is also provided between every two adjacent cylindrical structures, and each fin layer has a plurality of heat dissipation fins 35.

[0042] In some embodiments of the present invention, the fin layer is preferably at least two. Among every two adjacent fin layers, the height of the heat dissipation fins 35 on the outer side extending in the radial direction of the radiation heat exchange part 20 is greater than the height of the heat dissipation fins 35 on the inner side extending in the radial direction of the radiation heat exchange part 20. The root of each heat dissipation fin 33 is connected to the cylindrical structure on its inner side. Further, the heat dissipation fin 35 can be integrally formed with the corresponding cylindrical structure on its inner side, and the outer side can be in contact with and abutted against the corresponding cylindrical structure on its outer side. Air flows in the air flow channels between the heat dissipation fins 35, and the total number of the heat dissipation fins 35 should meet the following requirements: the total outer surface of the heat dissipation fins 35 should provide sufficient heat exchange surface for the heat exchange between air and refrigerant; the total number of circular rings of the fin layer is preferably 1 to 20.

[0043] In some embodiments of the present invention, each second refrigerant channel extends along the axial direction of the radiation heat exchange part 20. A plurality of second refrigerant channels in the cylinder wall of each heat exchange cylinder are evenly distributed along the circumferential direction of the heat exchange cylinder. The cross-section of a plurality of second refrigerant channels in the cylinder wall of each heat exchange cylinder may include a circle and a polygon, and the polygon may be a rectangular or approximately rectangular structure, and the polygon second refrigerant channels and the circular second refrigerant channels are alternately arranged in sequence along the circumferential direction of the heat exchange cylinder. The hydraulic radius of each second refrigerant channel is 0.6 to 10 mm.

[0044] The cylindrical structure includes at least two heat exchange cylinders. Among every two adjacent heat exchange cylinders, the height of each second refrigerant channel on the outer heat exchange cylinder extending in the radial direction of the radiation heat exchange part 20 is greater than the height of each second refrigerant channel on the inner heat exchange cylinder extending in the radial direction of the radiation heat exchange part 20.

[0045] In some embodiments of the present invention, the convective heat exchange part 30 defines a central channel 38 extending along the axial direction of the radiative heat exchange part 20, which is located in the center of the inner space of the radiative heat exchange part 20. The central channel 38 can be configured to circulate air or refrigerant. In other embodiments, closed structures are provided at both ends of the central channel 38, and the central channel 38 can also be configured to be provided with fittings such as shunt pipes. Each first refrigerant channel 32 / second refrigerant channel is preferably a microchannel tube. The heat exchange plate 31, the heat exchange cylinder, the support cylinder, and the radiative heat exchange part 20 can all be made of copper or aluminum. The pin fins enable a greater extension of the outer surface of the refrigerant channel.

[0046] In some embodiments of the present invention, for the convenience of processing and manufacturing, the convective heat exchange part 30 is formed by an extrusion process. That is to say, the convective heat exchange part is preferably an integrally processed part. Or, the whole formed by the convective heat exchange part 30 and the radiative heat exchange part 20 is formed by an extrusion process. That is to say, the whole formed by the convective heat exchange part and the radiative heat exchange part 20 is an integrally processed part. For the extruded integral part, the heat dissipation fins 35 are directly communicated with the wall surfaces of the first refrigerant channel 32 / second refrigerant channel and belong to the same component, and there is no problem of contact thermal resistance between the two, which can significantly reduce the heat transfer thermal resistance between the refrigerant and the air and increase the heat exchange performance.

[0047] In some embodiments of the present invention, the refrigerant pipeline further has a total inlet pipe and a total outlet pipe; one end of each first refrigerant channel 32 / second refrigerant channel is communicated with the total inlet pipe, and the other end is communicated with the total outlet pipe, so that a plurality of first refrigerant channels 32 / second refrigerant channels are connected in parallel.

[0048] In other embodiments of the present invention, the radiative-convective heat exchanger may have at least one parallel unit, and each parallel unit has a plurality of channel groups. Each channel group has at least one first refrigerant channel 32 / second refrigerant channel; the heads and tails of the plurality of channel groups of each parallel unit are connected in series in sequence. When there are multiple parallel units, the multiple parallel units are connected in parallel. Each channel group may have one of the above-mentioned heat exchange plates 31. For example, the number of heat exchange plates 31 is 8, and every 2 heat exchange plates 31 form 2 channel groups, which are connected in series in sequence from head to tail. That is, every 2 heat exchange plates 31 form a parallel unit, that is, a total of 4 parallel units, and these 4 parallel units are connected in parallel with each other. Further, a collector inlet pipe and a collector outlet pipe are provided at both ends of each heat exchange plate 31 to facilitate the reasonable layout of the pipeline.

[0049] An embodiment of the present invention further provides an air conditioner, which may include a compressor, a condenser, a throttling device, and an evaporator. The evaporator and / or the condenser adopts the radiative-convective heat exchanger in any of the above embodiments. Preferably, only the evaporator adopts the radiative-convective heat exchanger in any of the above embodiments. Further, a blower may be disposed at one end of the radiative heat exchange part 20 to promote air to enter the inside of the radiative heat exchange part 20 for heat exchange with the convective heat exchange part.

[0050] Up to this point, those skilled in the art should recognize that although a number of exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications consistent with the principles of the present invention can still be directly determined or derived from the disclosed content of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and construed as covering all such other variations or modifications.

Claims

1. A radiative-convective heat exchanger, characterized in that Comprising: A radiation heat exchange part, which is in a cylindrical shape with both ends open, and is configured to absorb heat or cold from its inner wall surface and radiate heat or cold outward from its outer wall surface; And A convective heat exchange part, which is arranged inside the radiation heat exchange part, and is configured to generate heat or cold, transfer the heat or cold to the air flowing through the inside of the radiation heat exchange part, and transfer the heat or cold to the inner wall surface of the radiation heat exchange part; and The convective heat exchange part includes a refrigerant pipeline and a plurality of heat dissipation fins arranged on the refrigerant pipeline; Each of the heat dissipation fins is a needle-shaped fin; The refrigerant pipeline includes a plurality of heat exchange plates; each heat exchange plate has a first edge and a second edge extending along the axial direction of the radiation heat exchange part; the first edge is arranged in the middle of the inner space of the radiation heat exchange part, and the second edge is connected to the inner wall surface of the radiation heat exchange part; Each heat exchange plate has a plurality of first refrigerant channels inside, each first refrigerant channel extends along the axial direction of the radiation heat exchange part, and in each heat exchange plate, in the direction from the first edge to the second edge, the plurality of first refrigerant channels are arranged in sequence, and the interval sizes between two adjacent first refrigerant channels have a plurality of spacing values, and the plurality of spacing values decrease in sequence.

2. The radiative-convective heat exchanger according to claim 1, wherein The plurality of heat exchange plates are arranged in sequence along the circumferential direction of the radiation heat exchange part; A plurality of the heat dissipation fins are arranged on both sides of each heat exchange plate.

3. The radiative-convective heat exchanger according to claim 2, wherein Each heat exchange plate is arranged crosswise with respect to the radial direction of the radiation heat exchange part facing the second edge of the heat exchange plate.

4. The radiative-convective heat exchanger according to claim 2, wherein Each heat exchange plate extends along the axial direction of the radiation heat exchange part and extends along the radial direction of the radiation heat exchange part.

5. The radiative-convective heat exchanger according to claim 2, wherein Each heat dissipation fin is perpendicular to the corresponding heat exchange plate.

6. The radiative-convective heat exchanger according to claim 5, wherein The cross-sectional profile of each first refrigerant channel is rectangular or circular.

7. The radiative-convective heat exchanger according to claim 1, wherein The convective heat exchange part is an integrally processed part and is formed by an extrusion process; or, The whole formed by the convective heat exchange part and the radiation heat exchange part is an integrally processed part and is formed by an extrusion process.

8. An air conditioner, comprising an evaporator and a condenser, wherein The evaporator and / or the condenser adopts the radiative-convective heat exchanger according to any one of claims 1 to 7.

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