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. 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's thermal comfort on the premise of ensuring the heating or cooling capacity; especially during winter heating, the radiation heat exchange can significantly increase the human body's thermal comfort. Further, the addition of the cylindrical radiation plate can reduce the number of refrigerant pipelines (such as finned tubes).

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 heat exchangers for air conditioners, especially indoor heat exchangers, mainly heat or cool air in the form of forced convection heat transfer, and then transfer heat or cold to the room or the human body. However, this heat transfer in the form of convective 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 the 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, there is provided a radiative-convective heat exchanger, comprising:

[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.

[0008] Optionally, the convective heat transfer part includes a refrigerant pipeline and heat dissipation fins arranged on the refrigerant pipeline.

[0009] Optionally, the refrigerant pipeline includes a plurality of heat exchange plates, and a plurality of first refrigerant channels extending along the length direction or the width direction of each heat exchange plate are arranged inside each heat exchange plate; the heat dissipation fins are multiple and are installed on the plurality of heat exchange plates.

[0010] Optionally, 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;

[0011] The plurality of heat exchange plates are evenly distributed along the circumferential direction of the radiative heat transfer part;

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

[0013] Each of the first refrigerant channels extends along the axial direction of the radiative heat exchange part;

[0014] A plurality of the first refrigerant channels in each of the heat exchange plates are sequentially arranged in the direction from the first edge to the second edge.

[0015] Optionally, the refrigerant pipeline includes a plurality of heat exchange cylinders arranged coaxially, and each of the heat exchange cylinders is arranged coaxially with the radiative heat exchange part;

[0016] A plurality of second refrigerant channels are arranged in the cylinder wall of each of the heat exchange cylinders;

[0017] There are a plurality of the heat dissipation fins; and

[0018] At least the outer side of the innermost heat exchange cylinder has a plurality of the heat dissipation fins;

[0019] The inner side of the outermost heat exchange cylinder has a plurality of the heat dissipation fins; and the outer side of the outermost heat exchange cylinder is thermally connected to the inner wall surface of the radiative heat exchange part through a plurality of the heat dissipation fins, or the outer wall surface of the outermost heat exchange cylinder is integrally formed with or in contact with the inner wall surface of the radiative heat exchange part.

[0020] Optionally, each of the second refrigerant channels extends along the axial direction of the radiative heat exchange part;

[0021] A plurality of the second refrigerant channels in the cylinder wall of each of the heat exchange cylinders are sequentially arranged in the circumferential direction of the heat exchange cylinder;

[0022] Each of the heat dissipation fins extends along the axial direction of the radiative heat exchange part to form an air flow channel extending along the axial direction of the radiative heat exchange part.

[0023] Optionally, the refrigerant pipeline includes a plurality of circular straight pipe segments and a plurality of connecting pipe segments respectively connecting two of the circular straight pipe segments; there are a plurality of the heat dissipation fins, which are installed on the plurality of straight pipe segments.

[0024] Optionally, the convective heat exchange part defines a central channel extending along the axial direction of the radiative heat exchange part and located at the center of the inner space of the radiative heat exchange part; the central channel is configured to circulate air or refrigerant.

[0025] Optionally, the outer contour of the cross section of the radiative heat exchange part is circular, semi-circular, square or sector-shaped.

[0026] 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 adopts any one of the above-mentioned radiative-convective heat exchangers.

[0027] 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 radiative plate undertakes part of the heating or cooling load, and can reduce the blowing feeling of the human body and increase the thermal comfort of the human body on the premise of ensuring the heating or cooling capacity; especially when heating in winter, the radiative heat exchange can significantly increase the thermal comfort of the human body. Further, the addition of the cylindrical radiative plate can reduce the number of refrigerant pipelines (such as finned tubes).

[0028] 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

[0029] Some specific embodiments of the present invention will be described in detail hereinafter with reference to the accompanying drawings in an exemplary but non-limiting 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:

[0030] Figure 1 is a schematic cross-sectional view of a radiative-convective heat exchanger according to an embodiment of the present invention;

[0031] Figure 2 is a schematic cross-sectional view of a radiative-convective heat exchanger according to an embodiment of the present invention;

[0032] Figure 3 is a schematic cross-sectional view of a partial structure of a radiative-convective heat exchanger according to an embodiment of the present invention;

[0033] Figure 4 is a schematic cross-sectional view of a partial structure of a radiative-convective heat exchanger according to an embodiment of the present invention;

[0034] Figure 5 is a schematic cross-sectional view of a radiative-convective heat exchanger according to an embodiment of the present invention;

[0035] Figure 6 is a schematic cross-sectional view of a radiative-convective heat exchanger according to an embodiment of the present invention;

[0036] Figure 7 is a schematic cross-sectional view of a radiative-convective heat exchanger according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] Figure 1is 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, which includes 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, 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, 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 and is used for indoor or human body warming or cooling. The outer wall surface of the radiative heat exchange part 20 can radiate heat or cold to the outside and is used for indoor or human body warming 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] In some embodiments of the present invention, the convective heat exchange part 30 includes a refrigerant pipeline and heat dissipation fins 33 disposed on the refrigerant pipeline. 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; there are a plurality of heat dissipation fins 33, which are installed on the plurality of straight pipe segments. That is, the convective heat exchange part 30 can be a conventional finned-tube heat exchanger.

[0040] 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 each heat exchange plate 31 are provided inside each heat exchange plate 31. There are a plurality of heat dissipation fins 33, which 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. 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 to intersect with the radial direction of the radiation heat exchange part 20 facing the second edge of the heat exchange plate 31, as Figure 2 shown.

[0042] In some embodiments of the present invention, a plurality of heat dissipation fins 33 are arranged between every two adjacent heat exchange plates 31 in sequence along the radial direction of the radiation heat exchange part 20. One or more heat dissipation holes are provided on each heat dissipation fin 33, forming a hollow structure. Each first refrigerant channel 32 extends along the axial direction of the radiation heat exchange part 20. The plurality of first refrigerant channels 32 in each heat exchange plate 31 are arranged in sequence from the first edge to the second edge.

[0043] Along 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 densities of the plurality of heat dissipation fins 33 are not equal. For example, along 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 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 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 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, the 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 one first refrigerant channel 32, that is, grouping is carried out by using a shared first refrigerant channel 32.

[0046] 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 - 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, multiple first refrigerant channels 32 are arranged at equal intervals. The distance between two adjacent heat dissipation fins 33 among the multiple heat dissipation fins 33 between every two adjacent heat exchange plates 31 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 alternative embodiments of the present invention, as Figure 3 shown, each heat dissipation fin 33 can be a flat sheet-like heat dissipation fin 34. Both sides of each heat exchange plate 31 are provided with the above-mentioned flat sheet-like heat dissipation fins 34 arranged in sequence in the direction from the corresponding first edge to the second edge. Each heat dissipation fin 33 is perpendicular to the corresponding heat exchange plate 31. In some other alternative embodiments of the present invention, as Figure 4 shown, each heat dissipation fin 33 can be a needle-like heat dissipation fin 35, and both sides of each heat exchange plate 31 are provided with multiple needle-like heat dissipation fins 35 perpendicular to the heat exchange plate 31. In some alternative embodiments of the present invention, other types of heat dissipation fins, such as tree-like heat dissipation fins, irregular-shaped heat dissipation fins, etc., can also be provided on both sides of each heat exchange plate 31, as Figure 5 shown. Further, the heat exchange plate 31 and the heat dissipation fin 33 are preferably integrally formed.

[0048] In some other preferred embodiments of the present invention, as Figure 6 and Figure 7 shown, the refrigerant pipeline includes multiple heat exchange cylinders 36 arranged coaxially, and each heat exchange cylinder 36 is coaxially arranged with the radiation heat exchange part 20. Multiple second refrigerant channels 37 are arranged inside the cylinder wall of each heat exchange cylinder 36. The number of the heat dissipation fins 33 is multiple. At least the outside of the innermost heat exchange cylinder 36 has multiple heat dissipation fins 33. For example, both the outside and the inside of the innermost heat exchange cylinder 36 have multiple heat dissipation fins 33. The inside of the outermost heat exchange cylinder 36 has multiple heat dissipation fins 33; and the outside of the outermost heat exchange cylinder 36 is thermally connected to the inner wall surface of the radiation heat exchange part 20 through multiple heat dissipation fins 33, or, the outer wall surface of the outermost heat exchange cylinder 36 is integrally formed with or in contact with the inner wall surface of the radiation heat exchange part 20.

[0049] Further, both the inner and outer sides of each intermediate heat exchange cylinder 36 have a plurality of heat dissipation fins 33. If there is no other structure between two adjacent heat exchange cylinders 36, the heat dissipation fins on the outer side of the inner heat exchange cylinder 36 and the heat dissipation fins on the inner side of the outer heat exchange cylinder 36 are the same heat exchange fins and can form a fin layer. If there is other structure between two adjacent heat exchange cylinders 36, such as a support cylinder coaxially arranged with the heat exchange cylinder 36, the heat dissipation fins on the outer side of the inner heat exchange cylinder 36 and the heat dissipation fins on the inner side of the outer heat exchange cylinder 36 can form two fin layers on both sides of the support cylinder.

[0050] 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 cylinder wall of each heat exchange cylinder 36 are arranged in sequence along the circumferential direction of the heat exchange cylinder 36. The cross-sections of the plurality of second refrigerant channels 37 in the cylinder wall of each heat exchange cylinder 36 may include circles and polygons, and the polygon may be 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 cylinder 36. Each heat dissipation fin 33 extends along the axial direction of the radiation heat exchange part 20 to form an air flow channel extending along the axial direction of the radiation heat exchange part 20. One or more heat dissipation holes are provided on each heat dissipation fin 33.

[0051] In some embodiments of the present invention, the convection heat exchange part 30 further includes at least one of the above support cylinders. Each support cylinder is arranged between two adjacent heat exchange cylinders 36 or on the inner side of the innermost heat exchange cylinder 36. There are heat dissipation fins 33 between each support cylinder and the heat exchange cylinder 36 on its inner or outer side. Further, the heat dissipation fin 33 can be integrally formed with the corresponding heat exchange cylinder or support cylinder on its inner side, and the outer side can be in contact and abutted against the corresponding heat exchange cylinder or support cylinder on its outer side.

[0052] In some embodiments of the present invention, among every two adjacent heat exchange cylinders 36, the cross-sectional area of each second refrigerant channel 37 on the outer heat exchange cylinder 36 is larger than the cross-sectional area of each second refrigerant channel 37 on the inner heat exchange cylinder 36. The heat dissipation fins 33 on each side of each heat exchange cylinder 36 can form a fin layer. Among every two adjacent fin layers, the length of the outer heat dissipation fin 33 extending along the radial direction of the radiation heat exchange part 20 is greater than the length of the inner 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. The hydraulic radius of each second refrigerant channel 37 is 0.6 - 10 mm.

[0053] 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 37 is preferably a microchannel tube. The heat exchange plate 31, the heat exchange cylinder 36, and the radiative heat exchange part 20 can all be made of copper or aluminum materials.

[0054] 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. Or, the whole formed by the convective heat exchange part 30 and the radiative heat exchange part 20 is formed by an extrusion process. As Figure 1 、 2 shown in Figures 5, 6, and 7.

[0055] 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.

[0056] 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 37; the first and last 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 16, and every 4 heat exchange plates 31 form 4 channel groups, which are connected in series in sequence, that is, every 4 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.

[0057] The embodiments of the present invention also 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 inner side of the radiative heat exchange part 20 for heat exchange with the convective heat exchange part.

[0058] At this point, those skilled in the art should recognize that although numerous 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 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 to cover 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 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 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; The convective heat exchange part includes a refrigerant pipeline and heat dissipation fins arranged on the refrigerant pipeline; The refrigerant pipeline includes a plurality of circular straight pipe sections and a plurality of connecting pipe sections respectively connecting two of the circular straight pipe sections; the heat dissipation fins are multiple and are installed on the plurality of straight pipe sections; The refrigerant pipeline includes a plurality of heat exchange plates, and each heat exchange plate is provided with a plurality of first refrigerant channels extending along the length direction or width direction of the heat exchange plate; 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; The plurality of heat exchange plates are evenly distributed along the circumferential direction of the radiation heat exchange part; Each of the first refrigerant channels extends along the axial direction of the radiation heat exchange part; The plurality of first refrigerant channels in each heat exchange plate are arranged in sequence in the direction from the first edge to the second edge; 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 size between two adjacent first refrigerant channels has one or more spacing values, and the plurality of spacing values decrease in sequence.

2. The radiative convective heat exchanger according to claim 1, wherein The heat dissipation fins are multiple and are installed on the plurality of heat exchange plates.

3. The radiative convective heat exchanger according to claim 2, wherein A plurality of the heat dissipation fins are arranged in sequence along the radial direction of the radiation heat exchange part between every two adjacent heat exchange plates.

4. The radiative convective heat exchanger according to claim 1, wherein The convective heat exchange part defines a central channel extending along the axial direction of the radiation heat exchange part, which is located in the center of the inner space of the radiation heat exchange part; the central channel is configured to circulate air or refrigerant.

5. The radiative convective heat exchanger according to claim 1, wherein The outer contour of the cross-section of the radiation heat exchange part is circular, semi-circular, square or fan-shaped.

6. 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 5.

Images