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, 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 a convection heat exchange part, which is disposed 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 convection heat exchange part includes a refrigerant pipeline, and the refrigerant pipeline has a total inlet pipe, a total outlet pipe, and a plurality of refrigerant channels extending in the axial direction of the radiation heat exchange part; one end of each refrigerant channel is communicated with the total inlet pipe, and the other end is communicated with the total outlet pipe, so that the plurality of refrigerant channels are in parallel connection. 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 radiation-convection 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 wind 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 radiation-convection 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 radiation-convection heat exchanger.

[0005] According to the first aspect of the present invention, the present invention provides a radiation-convection heat exchanger, which includes:

[0006] A radiation heat transfer 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 to the outside from its outer wall surface; and

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

[0008] The convection heat transfer part includes a refrigerant pipeline, and the refrigerant pipeline has a total inlet pipe, a total outlet pipe, and a plurality of refrigerant channels extending along the axial direction of the radiation heat transfer part;

[0009] One end of each refrigerant channel is communicated with the total inlet pipe, and the other end is communicated with the total outlet pipe, so that the plurality of refrigerant channels are in parallel connection.

[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 radiation heat transfer part; the first edge is arranged in the middle of the inner space of the radiation heat transfer part, and the second edge is connected to the inner wall surface of the radiation heat transfer part; the plurality of heat exchange plates are sequentially arranged along the circumferential direction of the radiation heat transfer part; and

[0011] Each heat exchange plate has at least one refrigerant channel therein.

[0012] Optionally, a plurality of heat dissipation fins are arranged between every two adjacent heat exchange plates and are sequentially arranged in the radial direction of the radiative heat exchange part;

[0013] Each of the heat dissipation fins is in an arc shape arched radially outward of the radiative heat exchange part.

[0014] Optionally, each heat exchange plate is arranged crosswise to the radial direction of the radiative heat exchange part toward the second edge of the radiative heat exchange part facing the heat exchange plate; or

[0015] Each heat exchange plate extends along the axial direction of the radiative heat exchange part and extends along the radial direction of the radiative heat exchange part.

[0016] Optionally, along the direction from the corresponding first edge to the second edge, the intervals between two adjacent heat dissipation fins among the plurality of heat dissipation fins between every two adjacent heat exchange plates have a plurality of distance values, and the plurality of distance values decrease sequentially;

[0017] Each heat exchange plate has a plurality of refrigerant channels, and in each heat exchange plate, along the direction from the first edge to the second edge, the plurality of refrigerant channels are sequentially arranged, and the intervals between two adjacent refrigerant channels have a plurality of spacing values; along the direction from the first edge to the second edge, the plurality of spacing values decrease sequentially; and

[0018] Along the direction from the first edge to the second edge, the ratio between the number of refrigerant channels and the number of heat dissipation fins is from 4 / 5 to 10 / 1.

[0019] Optionally, a manifold inlet pipe is arranged at one end of each heat exchange plate, and a manifold outlet pipe is arranged at the other end;

[0020] Each manifold inlet pipe communicates with the main inlet pipe and the refrigerant channels on the corresponding heat exchange plate;

[0021] Each manifold outlet pipe communicates with the main outlet pipe and the refrigerant channels on the corresponding heat exchange plate.

[0022] Optionally, the refrigerant pipeline includes a plurality of coaxial cylindrical structures, and each cylindrical structure is coaxial with the radiative heat exchange part;

[0023] The cylindrical structure includes at least one heat exchange cylinder, and one or more refrigerant channels are arranged on the cylinder wall of each heat exchange cylinder.

[0024] Optionally, a fin layer is arranged between the outermost cylindrical structure and the inner wall surface of the radiative heat exchange part; 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 part;

[0025] A fin layer is provided between every two adjacent cylindrical structures, and each fin layer has a plurality of heat dissipation fins uniformly distributed in the circumferential direction of the radiation heat exchange part; and each heat dissipation fin extends in the axial direction of the radiation heat exchange part.

[0026] Optionally, the convective heat exchange part is an integrally processed part and is formed by an extrusion process; or,

[0027] 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.

[0028] According to a second aspect of the present invention, the present invention also provides an air conditioner, including an evaporator and a condenser, and the evaporator and / or the condenser adopt any one of the above-mentioned radiation-convection heat exchangers.

[0029] In the radiation-convection heat exchanger and the air conditioner of the present invention, because there are a radiation heat exchange part and a convective heat exchange part, the cylindrical radiation plate undertakes part of the heating or cooling load, and the blowing feeling on the human body can be reduced and the human thermal comfort can be increased on the premise of ensuring the heating or cooling capacity; especially when heating in winter, the radiation heat exchange can significantly increase the human thermal comfort.

[0030] Those skilled in the art will understand the above and other objects, advantages and features of the present invention more clearly according to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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:

[0032] Figure 1 is a schematic structural diagram of a radiation-convection heat exchanger according to an embodiment of the present invention;

[0033] Figure 2 is a schematic cross-sectional view of a radiation-convection heat exchanger according to an embodiment of the present invention;

[0034] Figure 3 is a schematic cross-sectional view of a radiation-convection heat exchanger according to an embodiment of the present invention;

[0035] Figure 4 is a schematic cross-sectional view of a radiation-convection heat exchanger according to an embodiment of the present invention;

[0036] Figure 5 is a schematic cross-sectional view of a radiation-convection heat exchanger according to an embodiment of the present invention. Detailed implementation mode

[0037] 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 and referring to Figures 2 to 5 , 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 openings at both ends, 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 arranged inside the radiative heat exchange part 20, configured to generate heat or cold, 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.

[0038] 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, exchanges heat with the air inside the radiative heat exchange part 20, and exchanges heat 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 for indoor or human body warmth or cooling, and the outer wall surface of the radiative heat exchange part 20 can radiate heat or cold to the outside 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.

[0039] Specifically, as Figure 1 and Figure 2 shown, the convective heat exchange part 30 includes a refrigerant pipeline and heat dissipation fins 33 arranged on the refrigerant pipeline. The refrigerant pipeline has a total inlet pipe 35, a total outlet pipe and a plurality of refrigerant channels extending along the axial direction of the radiative heat exchange part 20. One end of each refrigerant channel is communicated with the total inlet pipe 35, and the other end is communicated with the total outlet pipe, so that the plurality of refrigerant channels are in parallel. It has higher heat exchange uniformity and lower flow resistance. One or more heat dissipation holes are arranged on each heat dissipation fin 33. If the refrigerant pipeline includes a plurality of circular straight pipes, each circular straight pipe extends along the axial direction of the radiative heat exchange part 20 and has the above-mentioned refrigerant channels; the heat dissipation fins 33 are multiple and are installed on the plurality of circular straight pipes. That is, the convective heat exchange part 30 is a conventional finned tube heat exchanger.

[0040] In some preferred embodiments of the present invention, as Figures 1 to 3 shown, the refrigerant pipeline includes a plurality of heat exchange plates 31, and one or more refrigerant channels 32 are arranged in each heat exchange plate 31. The heat dissipation fins 33 are multiple and are installed on the plurality of heat exchange plates 31.

[0041] Further, 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 disposed 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. A 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 2 shown. In other embodiments, each heat exchange plate 31 is disposed crosswise to the radial direction of the radiative heat exchange part 20 facing the second edge of the heat exchange plate 31, as Figure 3 shown.

[0042] In some embodiments of the present invention, a plurality of heat dissipation fins 33 are sequentially disposed along the radial direction of the radiative heat exchange part 20 between every two adjacent heat exchange plates 31. A plurality of refrigerant channels 32 in each heat exchange plate 31 are sequentially disposed in the direction from the first edge to the second edge.

[0043] Along the radial direction of the radiative heat exchange part 20, there are multiple distance values for the intervals between two adjacent heat dissipation fins 33 among the plurality of heat dissipation fins 33 between every two adjacent heat exchange plates 31, so that the arrangement density of the plurality of heat dissipation fins 33 is unequal. For example, along the radial direction of the radiative heat exchange part 20, the multiple distance values gradually decrease, that is, the heat dissipation fins 33 are arranged sparsely first and then densely.

[0044] Specifically, the plurality of heat dissipation fins 33 between every two adjacent heat exchange plates 31 are arranged in multiple groups. Each group of heat dissipation fins 33 has at least two heat dissipation fins 33. The distance between every two adjacent heat dissipation fins 33 in each group of heat dissipation fins 33 is equal to one of the above distance values, so that there are multiple distance values for the intervals between the heat dissipation fins 33 between every two adjacent heat exchange plates 31. Adjacent two groups can share one heat dissipation fin 33, that is, grouping is carried out by using a shared heat dissipation fin 33.

[0045] In each heat exchange plate 31, in the direction from the first edge to the second edge, a plurality of refrigerant channels 32 are sequentially disposed. There is one or more spacing values for the intervals between two adjacent refrigerant channels 32. The multiple spacing values gradually decrease. The plurality of refrigerant channels 32 on each heat exchange plate 31 are arranged in multiple groups. Each group of refrigerant channels 32 has at least two refrigerant channels 32. The distance between every two adjacent refrigerant channels 32 in each group of refrigerant channels 32 is equal to one of the above spacing values, so that there are multiple spacing values for the intervals between the refrigerant channels 32 on each heat exchange plate 31. Adjacent two groups can share one refrigerant channel 32, that is, grouping is carried out by using a shared refrigerant channel 32.

[0046] In the direction from the first edge to the second edge, the ratio between the number of refrigerant channels 32 and the number of heat dissipation fins 33 is from 4 / 5 to 10 / 1, preferably from 1 / 1 to 10 / 1. Each heat dissipation fin 33 is in an arc shape arched towards the outside of the radiation heat exchange part 20. The cross-sectional profile of each refrigerant channel 32 is rectangular, circular or other regular or irregular shapes. The hydraulic radius of each refrigerant channel 32 is 0.1 - 10 mm; the number of 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 refrigerant channels 32, that is, multiple refrigerant channels 32 are arranged at equal intervals. Among the multiple heat dissipation fins 33 between every two adjacent heat exchange plates 31, the distance between two adjacent heat dissipation fins 33 is one, that is, the multiple heat dissipation fins 33 between every two adjacent heat exchange plates 31 are arranged at equal intervals.

[0047] In some other preferred embodiments of the present invention, as Figure 4 and Figure 5 shown, the refrigerant pipeline of the convection heat exchange part 30 includes one or more coaxially arranged cylindrical structures, and each cylindrical structure is coaxially arranged with the radiation heat exchange part 20. The cylindrical structure includes at least one heat exchange cylinder 36, and one or more refrigerant channels 37 are arranged on the cylinder wall of each heat exchange cylinder 36.

[0048] Furthermore, the cylindrical structure may further include at least one support cylinder, and each support cylinder is arranged between two adjacent heat exchange cylinders 36, or inside the innermost heat exchange cylinder 36, or between the outermost heat exchange cylinder 36 and the radiation heat exchange part 20.

[0049] In order to facilitate the heat transfer between the convection 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 some 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 36.

[0050] In some embodiments of the present invention, there are multiple cylindrical structures, and a fin layer is also provided between every two adjacent cylindrical structures. Each fin layer has multiple heat dissipation fins 33 evenly distributed in the circumferential direction of the radiation heat exchange part 20. And each heat dissipation fin 33 extends in the axial direction of the radiation heat exchange part 20 to define multiple air flow channels extending in the axial direction of the radiation heat exchange part 20.

[0051] 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 outermost heat dissipation fin 33 extending along the radial direction of the radiation heat exchange part 20 is greater than the height of the innermost heat dissipation fin 33 extending along the radial direction of the radiation heat exchange part 20. The wall thickness of each heat dissipation fin 33 is 0.2 - 1 mm, and the distance between every two adjacent heat dissipation fins 33 in each fin layer is 0.5 - 10 mm. Further, the heat dissipation fin 33 can be integrally formed with the corresponding cylindrical structure on its inner side, and the outer side can be in contact and abut against the corresponding cylindrical structure on its outer side.

[0052] Air flows in the air flow channels between the heat dissipation fins 33, and the total number of the heat dissipation fins 33 should meet the following requirements: the total outer surface of the heat dissipation fins 33 should provide sufficient heat exchange surface for the heat exchange between the air and the refrigerant; the total number of circular rings of the fin layer is preferably 1 - 20.

[0053] In some embodiments of the present invention, a plurality of refrigerant channels 37 in the cylinder wall of each heat exchange cylinder 36 are evenly distributed along the circumferential direction of the heat exchange cylinder 36. The cross-sections of the plurality of refrigerant channels 37 in the cylinder wall of each heat exchange cylinder 36 can include circles and polygons, and the polygon can be a rectangular or approximately rectangular structure. The polygon refrigerant channels and the circular refrigerant channels are alternately arranged in sequence along the circumferential direction of the heat exchange cylinder 36. The hydraulic radius of each refrigerant channel 37 is 0.6 - 10 mm.

[0054] The cylindrical structure includes at least two heat exchange cylinders 36. Among every two adjacent heat exchange cylinders 36, the height of each refrigerant channel on the outermost heat exchange cylinder 36 extending along the radial direction of the radiation heat exchange part 20 is greater than the height of each refrigerant channel on the innermost heat exchange cylinder 36 extending along the radial direction of the radiation heat exchange part 20.

[0055] In some embodiments of the present invention, the convection heat exchange part 30 defines a central channel 38 extending along the axial direction of the radiation heat exchange part 20, which is located in the center of the inner space of the radiation heat exchange part 20. The central channel 38 can be configured to allow air or refrigerant to flow through. In some 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 refrigerant channel 32 / refrigerant channel 37 is preferably a microchannel tube. The heat exchange plate 31, the heat exchange cylinder 36, the support cylinder, and the radiation heat exchange part 20 can all be made of copper or aluminum.

[0056] 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 a one-piece 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 a one-piece processed part. For the extrusion one-piece processed part, the heat dissipation fins 33 are directly communicated with the wall surfaces of the refrigerant channels 32 / refrigerant channels 37, belonging 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.

[0057] In some embodiments of the present invention, a collecting inlet pipe is provided at one end of each heat exchange plate 31 / heat exchange cylinder 36, and a collecting outlet pipe is provided at the other end. Each collecting inlet pipe communicates with the main inlet pipe 35 and the refrigerant channels on the corresponding heat exchange plate 31 / heat exchange cylinder 36; each collecting outlet pipe communicates with the main outlet pipe and the refrigerant channels on the corresponding heat exchange plate 31 / heat exchange cylinder 36.

[0058] The embodiments of the present invention further provide 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 provided 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.

[0059] At this point, those skilled in the art should recognize that although multiple exemplary embodiments of the present invention have been shown and described in detail herein, still, without departing from the spirit and scope of the present invention, many other variations or modifications that conform to the principles of the present invention can be directly determined or derived based on the content disclosed in the present invention. Therefore, the scope of the present invention should be understood and determined to cover all these other variations or modifications.

Claims

1. A radiative-convective heat exchanger, characterized in that, Comprising: A radiative heat exchange part, which is in the shape of a cylinder 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; the outer contour of the cross-section of the radiative heat exchange part is circular, semi-circular, square or fan-shaped; and A convective heat exchange part, which is arranged inside the radiative 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 radiative heat exchange part, and transfer the heat or cold to the inner wall surface of the radiative heat exchange part; and The convective heat exchange part includes a refrigerant pipeline, and the refrigerant pipeline has a total inlet pipe, a total outlet pipe and a plurality of refrigerant channels extending along the axial direction of the radiative heat exchange part; One end of each of the refrigerant channels is communicated with the total inlet pipe, and the other end is communicated with the total outlet pipe, so that the plurality of refrigerant channels are in parallel; 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 exchange part; the first edge is arranged in the middle of the inner space of the radiative heat exchange part, and the second edge is connected to the inner wall surface of the radiative heat exchange part; each heat exchange plate has a plurality of the refrigerant channels, and in each heat exchange plate, in the direction from the first edge to the second edge, the plurality of refrigerant channels are arranged in sequence, and the interval sizes between two adjacent refrigerant channels have a plurality of spacing values; in the direction from the first edge to the second edge, 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 sequentially arranged along the circumferential direction of the radiative heat exchange part.

3. The radiative-convective heat exchanger according to claim 2, wherein A plurality of heat dissipation fins are arranged between every two adjacent heat exchange plates and are sequentially arranged along the radial direction of the radiative heat exchange part; Each heat dissipation fin is in an arc shape arched radially outward of the radiative heat exchange part.

4. 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 radiative heat exchange part facing the second edge of the heat exchange plate; or Each heat exchange plate extends along the axial direction of the radiative heat exchange part and extends along the radial direction of the radiative heat exchange part.

5. The radiative-convective heat exchanger according to claim 3, wherein In the direction from the corresponding first edge to the second edge, the interval sizes between two adjacent heat dissipation fins among the plurality of heat dissipation fins between every two adjacent heat exchange plates have a plurality of distance values, and the plurality of distance values decrease in sequence; In the direction from the first edge to the second edge, the ratio between the number of the refrigerant channels and the number of the heat dissipation fins is 4 / 5 to 10 / 1.

6. The radiative-convective heat exchanger according to claim 1, wherein A manifold inlet pipe is arranged at one end of each heat exchange plate, and a manifold outlet pipe is arranged at the other end; Each manifold inlet pipe communicates the total inlet pipe and the refrigerant channels on the corresponding heat exchange plate; Each of the set outlet pipes communicates with the total outlet pipe and the refrigerant channels on the corresponding heat exchange plates.

7. The radiative-convective heat exchanger according to claim 1, characterized in that 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 radiative 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, characterized in that 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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