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 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 convection heat exchange part includes a refrigerant pipeline and a plurality of heat dissipation fins arranged on the refrigerant pipeline; one or more heat dissipation holes are arranged on each heat dissipation 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 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 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, the present invention provides a radiative-convective heat exchanger, which includes:

[0006] A radiative heat transfer 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; 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] One or more heat dissipation holes are provided on each of the heat dissipation fins.

[0010] Optionally, the refrigerant pipeline includes a plurality of heat exchange plates; each of the heat exchange plates 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 arranged in sequence along the circumferential direction of the radiative heat transfer part;

[0011] A plurality of the heat dissipation fins arranged in sequence along the radial direction of the radiative heat transfer part are provided between every two adjacent heat exchange plates.

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

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

[0014] Optionally, along the direction from the corresponding first edge to the second edge, between two adjacent ones of the plurality of heat dissipation fins between every two adjacent heat exchange plates, the interval sizes between two adjacent ones of the heat dissipation fins have a plurality of distance values, and the plurality of distance values decrease in sequence.

[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 radiation heat exchange portion, and

[0016] In each of the heat exchange plates, along 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 ones of the first refrigerant channels have a plurality of spacing values.

[0017] Optionally, in each of the heat exchange plates, along the direction from the first edge to the second edge, the plurality of spacing values decrease in sequence; and

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

[0019] Optionally, the refrigerant pipeline includes a plurality of coaxially arranged cylindrical structures, and each of the cylindrical structures is coaxially arranged with the radiation heat exchange portion;

[0020] The cylindrical structure includes at least one heat exchange cylinder, and one or more second refrigerant channels are arranged on the cylinder wall of each of the heat exchange cylinders; and

[0021] A fin layer is arranged between every two adjacent cylindrical structures, and each fin layer has a plurality of the heat dissipation fins uniformly distributed along the circumferential direction of the radiation heat exchange portion; and each of the heat dissipation fins extends along the axial direction of the radiation heat exchange portion.

[0022] Optionally, a fin layer is arranged between the outermost cylindrical structure and the inner wall surface of the radiation 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 radiation heat exchange portion.

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

[0024] The overall structure formed by the convective heat exchange part and the radiative heat exchange part is an integrally processed component, 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, wherein the evaporator and / or the condenser adopt any one of the above-mentioned radiative convective heat exchangers.

[0026] In the radiative convective heat exchanger and the air conditioner of the present invention, because there are a radiative heat exchange part and a convective heat exchange part, the cylindrical radiation plate undertakes part of the heating or cooling load. On the premise of ensuring the heating or cooling capacity, the blowing feeling on the human body can be reduced, and the human thermal comfort can be increased; especially in winter heating, the radiative heat exchange can significantly increase the human thermal comfort. Further, the heat dissipation fins are of a hollowed-out type. In this form, the fins will not cause frost blockage and poor drainage, which is beneficial to improving the heat exchange capacity between the refrigerant and the air. It is particularly suitable for the evaporator of the outdoor unit in the winter heating condition.

[0027] Through 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 clear about the above and other objects, advantages and features of the present invention. 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 partial structural view of the heat dissipation fins in a radiative convective heat exchanger according to an embodiment of the present invention;

[0031] Figure 3 is a schematic cross-sectional view of a radiative convective heat exchanger according to an embodiment of the present invention;

[0032] Figure 4 is a schematic cross-sectional view of a radiative convective heat exchanger according to an embodiment of the present invention;

[0033] Figure 5 is a schematic cross-sectional view of a radiative convective heat exchanger according to an embodiment of the present invention. Detailed Embodiments

[0034] Figure 1 is a schematic cross-sectional view of a radiative convective heat exchanger according to an embodiment of the present invention. As Figure 1As shown in the figure, an embodiment of the present invention provides a radiative-convective heat exchanger, which includes a radiative heat exchange part 20 and a convective heat exchange part 30. The radiative heat exchange part 20 is in the shape of a cylinder 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 shell.

[0035] 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 be 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 to the outside and be used for indoor or human body warmth or cooling. The cylindrical radiation plate undertakes part of the heating or cooling load, which 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.

[0036] 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. One or more heat dissipation holes 331 are arranged on each heat dissipation fin 33. For example, the refrigerant pipeline includes a plurality of circular straight pipe segments and a plurality of connecting pipe segments respectively connecting two circular straight pipe segments; the heat dissipation fins 33 are multiple and are installed on a plurality of straight pipe segments. That is, the convective heat exchange part 30 can be a conventional finned-tube heat exchanger.

[0037] In some preferred embodiments of the present invention, as Figure 1 and Figure 3 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 each heat exchange plate 31 are arranged inside each heat exchange plate 31. The heat dissipation fins 33 are multiple and are installed on a plurality of heat exchange plates 31.

[0038] 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, asFigure 1 As shown. In some other embodiments, each heat exchange plate 31 is disposed intersecting the radial direction of the radiation heat exchange part 20 towards the second edge of the heat exchange plate 31, such as Figure 3 shown.

[0039] In some embodiments of the present invention, a plurality of heat dissipation fins 33 are arranged in sequence in the radial direction of the radiation heat exchange part 20 between every two adjacent heat exchange plates 31. Each first refrigerant channel 32 extends in the axial direction of the radiation heat exchange part 20. A plurality of first refrigerant channels 32 in each heat exchange plate 31 are arranged in sequence from the first edge to the second edge.

[0040] In the radial direction of the radiation heat exchange part 20, the interval sizes between two adjacent heat dissipation fins 33 among the plurality of heat dissipation fins 33 between every two adjacent heat exchange plates 31 have a plurality of distance values, so that the arrangement density of the plurality of heat dissipation fins 33 is unequal. For example, in the radial direction of the radiation heat exchange part 20, the plurality of distance values decrease in sequence, that is, the heat dissipation fins 33 are arranged from sparse to dense.

[0041] 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 the interval sizes between the heat dissipation fins 33 between every two adjacent heat exchange plates 31 have a plurality of distance values. Two adjacent groups can share a heat dissipation fin 33, that is, grouping is carried out by using a shared heat dissipation fin 33.

[0042] 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. The interval sizes between two adjacent first refrigerant channels 32 have one or more spacing values. 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 sizes between the first refrigerant channels 32 on each heat exchange plate 31 have a plurality of spacing values. Two adjacent groups can share a first refrigerant channel 32, that is, grouping is carried out by using a shared first refrigerant channel 32

[0043] In the direction from the first edge to the second edge, the ratio between the number of the first refrigerant channels 32 and the number of the 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 first refrigerant channel 32 is rectangular, circular or other regular or irregular shapes. The hydraulic radius of each first refrigerant channel 32 is 0.1 - 10 mm; the number of the first refrigerant channels 32 on each heat exchange plate 31 is 10 - 50. The number of the 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, a plurality of first refrigerant channels 32 are arranged at equal intervals. Among the plurality of 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 plurality of heat dissipation fins 33 between every two adjacent heat exchange plates 31 are arranged at equal intervals.

[0044] In some other preferred embodiments of the present invention, as Figure 4 and Figure 5 shown, 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 radiation heat exchange part 20. The cylindrical structure includes at least one heat exchange cylinder 36, and one or more second refrigerant channels 37 are arranged on the cylinder wall of each heat exchange cylinder 36.

[0045] 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 arranged inside the innermost heat exchange cylinder 36, or arranged between the outermost heat exchange cylinder 36 and the radiation heat exchange part 20.

[0046] In order to facilitate the heat transfer between the convective heat exchange part 30 and the radiation heat exchange part 20, in some embodiments, a fin layer is arranged between the outer wall surface of 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.

[0047] In some embodiments of the present invention, there are a plurality of cylindrical structures, and a fin layer is also arranged between every two adjacent cylindrical structures. Each fin layer has a plurality of heat dissipation fins 33 evenly distributed in the circumferential direction of the radiation heat exchange part 20. And each heat dissipation fin 33 extends along the axial direction of the radiation heat exchange part 20 to define a plurality of air flow channels extending along the axial direction of the radiation heat exchange part 20.

[0048] In some embodiments of the present invention, the fin layer is preferably at least two. In each 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 inside it, and the outside can be in contact and abut against the corresponding cylindrical structure outside it.

[0049] 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 air and refrigerant; the total number of circular rings of the fin layer is preferably 1 - 20.

[0050] In some embodiments of the present invention, each second refrigerant channel 37 extends along the axial direction of the radiation heat exchange part 20. A plurality of second refrigerant channels 37 in the tube wall of each heat exchange tube 36 are evenly distributed along the circumferential direction of the heat exchange tube 36. The cross-section of a plurality of second refrigerant channels 37 in the tube wall of each heat exchange tube 36 can include a circle and a polygon, and the polygon can be a rectangle or an approximately rectangular structure. The polygon second refrigerant channels and the circular second refrigerant channels are alternately arranged in sequence along the circumferential direction of the heat exchange tube 36. The hydraulic radius of each second refrigerant channel 37 is 0.6 - 10 mm.

[0051] The cylindrical structure includes at least two heat exchange tubes 36. In each two adjacent heat exchange tubes 36, the height of each second refrigerant channel on the outermost heat exchange tube 36 extending along the radial direction of the radiation heat exchange part 20 is greater than the height of each second refrigerant channel on the innermost heat exchange tube 36 extending along the radial direction of the radiation heat exchange part 20.

[0052] 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 radiation heat exchange part 20, 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 accessories such as a shunt tube. Each first refrigerant channel 32 / second refrigerant channel 37 is preferably a microchannel tube. The heat exchange plate 31, the heat exchange tube 36, the support tube, and the radiation heat exchange part 20 can all be made of copper or aluminum.

[0053] 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 extrusion integrally processed part, the heat dissipation fins 33 are directly communicated with the wall surfaces of the first refrigerant channel 32 / second refrigerant channel 37 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.

[0054] 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 37 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 37 are connected in parallel.

[0055] In some 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 37; 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 the heat exchange plates 31 is 20, and every 5 heat exchange plates 31 form 5 channel groups, and the heads and tails are connected in series in sequence, that is, every 5 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 also arranged at both ends of each heat exchange plate 31 to facilitate the reasonable layout of the pipeline.

[0056] 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 arranged 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.

[0057] So far, those skilled in the art should recognize that although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived from the content disclosed in 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 determined to cover all these 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 to the outside from its outer wall surface; the outer contour of the cross-section of the radiation heat exchange part is circular, semi-circular, square or fan-shaped; and A convection heat exchange part, which is arranged inside the radiation heat exchange part, 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 a plurality of heat dissipation fins arranged on the refrigerant pipeline; One or more heat dissipation holes are arranged on each of the heat dissipation fins; 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 radiation-convection 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 arranged in sequence along the radial direction of the radiation heat exchange part are arranged between every two adjacent heat exchange plates.

3. The radiation-convection heat exchanger according to claim 2, wherein Each heat exchange plate is arranged crosswise in the radial direction of the radiation heat exchange part facing the second edge of the heat exchange plate; or 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.

4. The radiation-convection heat exchanger according to claim 2, 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.

5. The radiation-convection heat exchanger according to claim 4, wherein In the direction from the first edge to the second edge, the ratio between the number of the first refrigerant channels and the number of the heat dissipation fins is from 4 / 5 to 10 / 1.

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

7. An air conditioner, comprising an evaporator and a condenser, wherein The evaporator and / or the condenser adopts the radiation-convection heat exchanger according to any one of claims 1 to 6.

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