Marine double-working-medium solar heat collector

Abstract

A marine double-working-medium solar heat collector comprises a support and a heat preservation box arranged on the support, an opening is formed in the upper side of the heat preservation box, a heat collection mechanism is arranged in the heat preservation box, and a glass cover plate is transversely arranged at the opening. The heat collection mechanism comprises water and a plurality of heat collection pipes arranged in the middle of the heat collection box in parallel, each heat collection pipe comprises an inner pipe and an outer pipe which are coaxially arranged in a sleeved mode, the inner pipes and the outer pipes are filled with a first working medium and a second working medium respectively, the inner pipes and the outer pipes are variable-diameter pipes with opposite variable-diameter trends, fins are further arranged on the outer rings of the inner pipes, and the fins are arranged on the outer rings of the inner pipes. A reflection mechanism capable of reflecting incident light to the lower side of the heat collection pipe is arranged at the bottom of the heat preservation box, when sunlight is sufficient, heat can be directly provided for the first working medium, heat collection work is achieved through the first working medium, and meanwhile part of heat of the first working medium can be transmitted to the second working medium through the fins and the inner pipe to be stored. And in cloudy and rainy days, the heat is fed back to the first working medium through the inner pipe and the fins, so that the use effect of the heat collector in extreme weather conditions is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of marine equipment, and particularly to a marine dual - working - fluid solar collector. Background Technique

[0002] As a clean and renewable energy source, solar energy is widely used in the fields of photoelectric conversion and photothermal conversion. Especially in the marine field, the development and utilization of solar energy can not only effectively reduce the dependence on traditional fossil fuels, but also make important contributions to energy conservation, emission reduction and environmental protection.

[0003] At present, ships usually rely on burning fuel oil or gas to heat water or generate steam or hot water by electric heating to meet the heating demand. However, with the emergence of new types of ships such as wind - powered ships, the power drive gradually relies on wind energy, reducing the demand for fuel oil and correspondingly reducing the output of steam and hot water. The application document with the publication number CN114719449A in the patent database discloses a concentrating flat - plate solar collector, which concentrates light by using a convex lens to improve the heat collection efficiency, and enhances the light illumination at the upper end of the collector body through a trough - type reflective structure, making the heat collection effect more significant. The concentrating collector can obtain more heat energy in a shorter time, especially suitable for use in sunny conditions.

[0004] Another example is the application document with the publication number CN115111786B, which also discloses a double - layer cascade heat - collecting tube and a trough - type solar collector. It includes a heat - collecting outer tube and a heat - collecting inner tube sleeved inside and outside. Both the heat - collecting outer tube and the heat - collecting inner tube are used for the heat - transfer fluid to flow through. The heat - transfer fluid in the heat - collecting inner tube can be directly heated by the heat energy of the direct sunlight irradiated at the upper end of the heat - collecting outer tube, while the high - temperature heat - transfer fluid in the heat - collecting outer tube is heated by the sunlight irradiated by the focusing reflection below, realizing the high - and low - temperature cascade heat collection of solar energy.

[0005] The above two types of solar collectors, that is, the common concentrating solar collectors, have excellent heat collection effects when the sun is sufficient. However, when it comes to the marine field, there are still some problems. First, the structure of the collector is relatively complex, and the manufacturing and maintenance costs are relatively high. Second, due to the frequent occurrence of extreme weather at sea, especially the weather with frequent alternations of sunny and cloudy days, that is, the weather changes frequently between sunny and cloudy. At this time, the collector cannot fully adapt to the complex marine environment. Even if it can collect enough heat on sunny days, it will not be able to work normally on cloudy days, and its adaptability to environmental changes is poor, ultimately affecting its heat collection effect. Summary of the Invention

[0006] To solve the technical problems existing in the above - mentioned background technique, the present invention provides a marine dual - working - fluid solar collector.

[0007] The technical solution of the present invention is as follows: A marine dual - working - fluid solar collector, including a bracket and a heat - preservation box arranged thereon. The upper side of the heat - preservation box is open, and a heat - collection mechanism is arranged inside it. A glass cover plate is transversely arranged at the opening, and through the heat - collection mechanism, the photothermal conversion work can be realized, and finally the heat - collection work is completed.

[0008] As the core technical concept of the present invention, the heat - collection mechanism includes water and a plurality of heat - collection tubes arranged in parallel in the middle of the heat - collection box. The heat - collection tubes include an inner tube and an outer tube sleeved coaxially with a gap reserved in the middle. A first working fluid is filled between the inner tube and the outer tube, and a second working fluid is filled inside the inner tube. The first working fluid is preferably air, and the second working fluid is preferably sodium nitrate phase - change material. On the basis of this structure, when there is sufficient sunlight, heat can be directly provided to the first working fluid, and the heat - collection work is realized through the first working fluid. At the same time, part of the heat of the first working fluid will be transferred to the second working fluid inside it through the inner tube and stored. When there is not enough sunlight for the first working fluid in rainy or cloudy weather, the heat stored in the second working fluid will be fed back to the first working fluid through the inner tube, ensuring that the solar collector can still complete the heat - collection work more stably through the first working fluid when the weather on the sea changes frequently between sunny and cloudy.

[0009] As a preferred implementation manner, both the inner tube and the outer tube are variable - diameter tubes, and the variable - diameter trends are opposite, so as to extend the reserved time between the inner tube and the outer tube when the first working fluid flows from the inlet end to the outlet end of the heat - collection tube, ensure that the first working fluid can obtain more heat in the heat - collection tube, and at the same time ensure the heat - exchange effect between the first working fluid and the second working fluid.

[0010] As a further preference, fins are also arranged on the outer circle of the inner tube. The fins are strip - shaped plate - like structures arranged along the axis direction of the heat - collection tube, and a number of flow - disturbing holes are opened on them. On the basis of this structure, when the first working fluid flows from the inlet end to the outlet end, the heat - exchange work between the first working fluid and the second working fluid can be better completed through the fins. At the same time, the flow - disturbing holes on the fins can provide a flow - disturbing effect for the first working fluid, further ensuring the heat - exchange effect between the first working fluid and the second working fluid.

[0011] Regarding the structure of the glass cover plate, its cross - section is rectangular, and the long side of the rectangular cross - section is consistent with the arrangement direction of the heat - collection tubes, and the short side is consistent with the axis direction of the heat - collection tubes. The upper and lower surfaces of the glass cover plate protrude upward and downward in an arc shape respectively, and the shapes of the longitudinal cross - sections along its length direction are all the same, and are set to be able to converge the incident light into a linear focusing area perpendicular to the axis of the heat - collection tubes on the upper side of the heat - collection mechanism, so as to ensure the photothermal conversion effect of the heat - collection tubes when there is sufficient sunlight.

[0012] The collector also includes a reflecting mechanism arranged between the bottom of the insulation box and the heat collecting mechanism, which is configured to reflect the incident light to the lower side of the heat collecting tube, thereby ensuring that the first working fluid in the lower area between the inner tube and the outer tube can also complete the light-to-heat conversion work well, further ensuring the heat collecting effect of the heat collecting tube.

[0013] As described above, a marine dual-fluid solar collector, specifically, has a fin structure whose length is consistent with that of the inner tube and one side is in contact with the inner tube. A first hole group is provided in the 1 / 4 region at both ends of the fin, and a second hole group is provided in the middle region. The first hole group includes two rows of spoiler holes, and the second hole group includes at least three rows of spoiler holes, so as to reduce the influence of the setting of the spoiler holes on the fluidity of the first working fluid at both ends of the heat collecting tube, while ensuring the heat exchange effect of the first working fluid in the middle of the heat collecting tube.

[0014] As a preferred embodiment, in order to further ensure the influence of the setting of the spoiler hole on the fluidity of the first working medium, the spoiler hole is elliptical, and the major axis direction is consistent with the axis direction of the heat collecting tube, and the minor axis direction is perpendicular to the axis direction of the heat collecting tube.

[0015] In order to ensure the turbulent effect of the turbulent hole and the heat exchange effect between the first working medium and the fin, the major axis length of the turbulent hole is 1 / 3 of the fin width, and the minor axis length is 1 / 4 of the fin width.

[0016] As a further preferred embodiment, in order to further ensure the turbulence effect of the first working medium under the action of the turbulence holes, the turbulence holes in adjacent rows of the first hole group and the turbulence holes in adjacent rows of the second hole group are staggered in position.

[0017] In the above-mentioned marine dual-fluid solar collector, the distance between the linear focusing area and the inlet end of the heat collecting tube is 1 / 12-1 / 4 of the length of the heat collecting tube, so that 50%-60% of the solar radiation energy received by the entire heat collecting tube can be generated within one-third of the length from the inlet end of the heat collecting tube to the inlet end of the heat collecting tube. As a result, the first working fluid can obtain sufficient thermal energy at the inlet end to ensure the heat exchange effect between the first working fluid and the second working fluid, thereby ensuring the overall heat collection effect of the collector.

[0018] As a preferred embodiment, the upper surface of the glass cover plate is coated with a fluorosilane hydrophobic coating, which can form a super-hydrophobic surface on the upper surface of the glass cover plate to prevent the attachment of seawater, thereby preventing the glass cover plate from being corroded by seawater while ensuring effective light transmittance.

[0019] As a further preferred embodiment, in order to ensure the heat collection effect of a plurality of heat collecting tubes under the action of the glass cover plate, the plurality of heat collecting tubes are arranged in an alternating manner up and down.

[0020] A marine dual - working - fluid solar collector as described above. To ensure the photothermal conversion effect of the first working fluid inside the outer tube while ensuring its effective flow inside the outer tube, and further ensure its heat collection and heat exchange effects, the minimum inner diameters of the outer tube and the inner tube are both 3 / 4 of the maximum inner diameter, and the distance between the two tubes is 1 / 3 - 1 / 2 of the maximum inner diameter of the inner tube.

[0021] A marine dual - working - fluid solar collector as described above. The reflection mechanism includes a parabolic mirror corresponding to several heat - collecting tubes and located below the heat - collecting tubes. The reflection mechanism also includes plane mirrors relatively arranged on both sides of the bottom of the heat - insulating box. The mirror surface of the plane mirror is parallel to the axis of the heat - collecting tube and is inclined towards the heat - collecting mechanism. Through the parabolic mirror and the plane mirror, light can be effectively reflected to the lower side of the heat - collecting tube, further ensuring the heat - collection effect of the heat - collecting tube.

[0022] The beneficial effects of the present invention are as follows: The present invention is a marine dual - working - fluid solar collector. When there is sufficient sunlight, it can directly provide heat for the first working fluid and achieve heat - collection work through the first working fluid. At the same time, part of the heat of the first working fluid will be transferred to the second working fluid inside it through the inner tube and stored. In rainy or cloudy weather, when the first working fluid cannot obtain sufficient sunlight conditions, the heat stored in the second working fluid will be fed back to the first working fluid through the inner tube, ensuring that the solar collector can still complete heat - collection work more stably through the first working fluid when the weather on the sea changes frequently between sunny and cloudy. The inner tube and the outer tube are both variable - diameter tubes with opposite variable - diameter trends, which extends the reserved time between the inner tube and the outer tube when the first working fluid flows from the inlet end to the outlet end of the heat - collecting tube, ensuring that the first working fluid can obtain more heat in the heat - collecting tube and at the same time ensuring the heat - exchange effect between the first working fluid and the second working fluid. The setting of the fins enables the first working fluid to better complete the heat - exchange work between the first working fluid and the second working fluid when flowing from the inlet end to the outlet end. At the same time, the flow - disturbing holes on the fins can provide a flow - disturbing effect for the first working fluid, further ensuring the heat - exchange effect between the first working fluid and the second working fluid. The setting of the glass cover plate can converge the incident light into a linear focusing area perpendicular to the axis of the heat - collecting tube above the heat - collecting mechanism, ensuring the photothermal conversion effect of the heat - collecting tube when there is sufficient sunlight. The setting of the reflection mechanism can reflect the incident light to the lower side of the heat - collecting tube, and then ensure that the first working fluid in the lower - side area between the inner tube and the outer tube can also better complete the photothermal conversion work, further ensuring the heat - collection effect of the heat - collecting tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] By reading the detailed description of the preferred embodiments below, the solutions and advantages of the present application will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention.

[0024] In the accompanying drawings: Figure 1 is an exploded view of the collector in the embodiment; Figure 2 is a schematic diagram of the internal structure of the collector in the embodiment; Figure 3 is a schematic diagram of the structure of the heat collecting tube in the embodiment; The components represented by the reference numerals in the figure are as follows: 1. Glass cover plate; 2. Heat collecting tube; 21. Outer tube; 22. Inner tube; 23. Fins; 3. Reflection mechanism; 31. Plane mirror; 32. Parabolic mirror; 4. Insulation box; 5. Bracket. Detailed implementation manners

[0025] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.

[0026] Embodiment: This embodiment provides a marine dual - working - fluid solar collector. Referring to Figure 1 and Figure 2 , it includes a bracket 5 and an insulation box 4 provided thereon. The upper side of the insulation box 4 is open, and a heat collecting mechanism is provided inside it. A glass cover plate 1 is horizontally provided at the opening, and through the heat collecting mechanism, the photothermal conversion work can be realized, and finally the heat collection work is completed. The structure of the collector (the above - mentioned marine dual - working - fluid solar collector) will be described in detail below with reference to the accompanying drawings.

[0027] In this embodiment, the insulation box 4 is of a rectangular structure. The heat collecting mechanism includes water and a plurality of heat collecting tubes 2 arranged in parallel in the middle of the heat collecting box. The plurality of heat collecting tubes 2 are arranged along the length direction of the insulation box 4 and are arranged to be able to complete the photothermal conversion work.

[0028] As one of the core technical concepts of the present invention, the heat collecting tube 2 includes an inner tube 22 and an outer tube 21 which are coaxially sleeved and have a gap reserved in the middle. A first working fluid is filled between the inner tube 22 and the outer tube 21, and a second working fluid is filled inside the inner tube 22. The first working fluid is preferably air, and the second working fluid is preferably sodium nitrate phase - change material. On the basis of this structure, when there is sufficient sunlight, heat can be directly provided to the first working fluid, and the heat collection work is realized through the first working fluid. At the same time, part of the heat of the first working fluid will be transferred to the second working fluid inside it through the inner tube 22 and stored. In rainy and cloudy weather, when the first working fluid cannot obtain sufficient sunlight conditions, the heat stored in the second working fluid will be fed back to the first working fluid through the inner tube 22, ensuring that the collector can still complete the heat collection work more stably through the first working fluid when the weather on the sea changes frequently between sunny and cloudy.

[0029] To ensure the heat absorption effect of the first working fluid, regarding the structure of the outer tube 21, it includes a first glass tube, and a first coating is applied on the inner side of the first glass tube. The first coating is preferably an aluminum-based coating and is attached to the inside of the first glass tube. The light absorption rate of the aluminum-based coating is 85%, the light transmittance is 15%, and the thickness is 40 μm. The thermal conductivity of the first glass tube is 1.5 W / (m·K), and the thickness is 4 mm.

[0030] To ensure the heat exchange effect between the first working fluid and the second working fluid, regarding the structure of the inner tube 22, it includes a second glass tube, and a second coating is applied on the inner side of the second glass tube. The second coating is preferably a carbon nanofiber tip radiation coating and is attached to the inside of the second glass tube. The light absorption rate of the carbon nanofiber tip radiation coating is 90%, and the thickness is 100 nm. The thermal conductivity of the second glass tube is 1.0 W / (m·K), and the thickness is 2 mm.

[0031] As a preferred implementation mode of this embodiment, both the inner tube 22 and the outer tube 21 are variable-diameter tubes, and the variable-diameter trends are opposite. In this way, when the first working fluid flows from the inlet end to the outlet end of the heat collecting tube 2, the reserved time between the inner tube 22 and the outer tube 21 is extended, ensuring that the first working fluid can obtain more heat in the heat collecting tube 2 and at the same time ensuring the heat exchange effect between the first working fluid and the second working fluid.

[0032] To ensure the photo-thermal conversion effect of the first working fluid in the outer tube 21 while ensuring its effective flow in the outer tube 21, and further ensuring its heat collection and heat exchange effects, the minimum inner diameters of the outer tube 21 and the inner tube 22 are both 3 / 4 of the maximum inner diameter, and the distance between the two tubes is 1 / 3 - 1 / 2 of the maximum inner diameter of the inner tube 22. Preferably, the maximum inner diameter of the outer tube 21 is 30 mm, and the minimum inner diameter is 22.5 mm. The maximum inner diameter of the inner tube 22 is 12 mm, and the minimum inner diameter is 9 mm.

[0033] In this embodiment, the glass cover plate 1 is made of a material with high light transmittance, good ultraviolet tolerance, and antioxidant and saline-alkali corrosion resistance. It is homogeneous inside and has a lens structure formed by bending and enclosing the upper and lower surfaces. Specifically, the cross-section of the glass cover plate 1 is rectangular, and the long side of the rectangular cross-section is aligned with the arrangement direction of the heat collecting tubes 2, and the short side is aligned with the axial direction of the heat collecting tubes 2. The upper and lower surfaces of the glass cover plate 1 protrude upward and downward in an arc shape respectively, and the shapes of all longitudinal cross-sections along its length direction are the same, that is, the upper surface of the glass cover plate 1 is higher in the middle and lower on both sides relative to the direction of gravity, and the lower surface is lower in the middle and higher on both sides relative to the direction of gravity. The upper and lower surfaces of the glass cover plate 1 are bent along the axial direction of the heat collecting tubes 2, and the heights of the upper and lower surfaces are the same along the horizontal radial direction of the heat collecting tubes 2. On the basis of this structure, it can converge the incident light into a linear focusing area perpendicular to the axis of the heat collecting tube 2 on the upper side of the heat collecting mechanism. The optical properties of the linear focusing area are determined by the bending structure of the upper and lower surfaces of the glass cover plate 1, so as to ensure the light-heat conversion effect of the heat collecting tube 2 when the sunlight is sufficient.

[0034] As a preferred embodiment, the distance between the linear focusing area and the inlet end of the heat collecting tube 2 is 1 / 12 - 1 / 4 of the length of the heat collecting tube 2, so that within one-third of the length from the inlet end to the inlet end of the heat collecting tube 2, 50% - 60% of the solar radiation energy received by the entire heat collecting tube 2 can be generated. Thus, the first working fluid can obtain sufficient heat energy at the inlet end to ensure the heat exchange effect between the first working fluid and the second working fluid, and further ensure the overall heat collection effect of the heat collector.

[0035] As a further preference, the upper surface of the glass cover plate 1 is coated with a fluorosilane hydrophobic coating, which can form a superhydrophobic surface on the upper surface of the glass cover plate 1 to prevent the attachment of seawater, thereby preventing the glass cover plate 1 from being eroded by seawater and ensuring an effective light transmittance at the same time.

[0036] More preferably, to ensure the heat collection effect of several heat collecting tubes 2 under the action of the glass cover plate 1, several heat collecting tubes 2 are arranged in a staggered manner up and down, that is, the axis connection lines of several heat collecting tubes 2 are parabolas, and the axial distances between adjacent heat collecting tubes 2 are equal.

[0037] In this embodiment, as another core technical concept of the present invention, in combination with Figure 3 , a fin 23 is further provided on the outer circle of the inner tube 22. The fin 23 is a strip-shaped plate structure arranged along the axial direction of the heat collecting tube 2, and several flow disturbance holes are opened thereon. On the basis of this structure, when the first working fluid flows from the inlet end to the outlet end, it can better complete the heat exchange work between the first working fluid and the second working fluid through the fin 23. At the same time, the flow disturbance holes on the fin 23 can provide a flow disturbance effect for the first working fluid, further ensuring the heat exchange effect between the first working fluid and the second working fluid.

[0038] Specifically regarding the structure of the fin 23, it has the same length as the inner tube 22 and is of an equal-width structure with one side in contact with the inner tube 22. That is, the fin 23 is a wavy structure that undulates along with the outer wall of the inner tube 22, and the included angle between the perpendicular bisector of the fin 23 and the normal of the surface of the inner tube 22 is 0°, that is, the plane where the fin 23 is located coincides with the axis of the inner tube 22. In the 1 / 4 regions at both ends of the fin 23, a first hole group is provided, and in the middle region, a second hole group is provided. The first hole group includes two rows of flow-disturbing holes, and the second hole group includes at least three rows of flow-disturbing holes, so as to reduce the influence of the arrangement of the flow-disturbing holes on the fluidity of the first working fluid at both ends of the heat collection tube 2, and at the same time ensure the heat exchange effect of the first working fluid in the middle of the heat collection tube 2.

[0039] As a preferred embodiment, to further ensure the influence of the arrangement of the flow-disturbing holes on the fluidity of the first working fluid, the flow-disturbing holes are elliptical, and the long axis direction is consistent with the axis direction of the heat collection tube 2, and the short axis direction is perpendicular to the axis direction of the heat collection tube 2.

[0040] To ensure the flow-disturbing effect of the flow-disturbing holes and at the same time ensure the heat exchange effect between the first working fluid and the fin 23, the length of the long axis of the flow-disturbing hole is 1 / 3 of the width of the fin 23, and the length of the short axis is 1 / 4 of the width of the fin 23. Preferably, the width of the fin 23 is 7 mm, the long axis of the flow-disturbing hole is 7 / 3 mm, and the short axis is 1.75 mm.

[0041] As a further preference, to further ensure the flow-disturbing effect of the first working fluid under the action of the flow-disturbing holes, the flow-disturbing holes in adjacent rows of the first hole group and the flow-disturbing holes in adjacent rows of the second hole group are staggered in position, that is, the flow-disturbing holes in adjacent rows of the first hole group and the flow-disturbing holes in adjacent rows of the second hole group are arranged alternately in the horizontal and vertical directions to form a regular grid structure.

[0042] In this embodiment, the heat collector further includes a reflection mechanism 3 provided between the bottom of the heat preservation box 4 and the heat collection mechanism, which is arranged to be able to reflect the incident light to the lower side of the heat collection tube 2, so as to ensure that the first working fluid in the lower side region between the inner tube 22 and the outer tube 21 can also better complete the photo-thermal conversion work, and further ensure the heat collection effect of the heat collection tube 2.

[0043] Specifically, the reflection mechanism 3 includes a parabolic mirror 32 corresponding to a plurality of heat collection tubes 2 and located below the heat collection tubes 2. The reflection mechanism 3 further includes plane mirrors 31 oppositely arranged on both sides of the bottom of the heat preservation box 4. The mirror surface of the plane mirror 31 is parallel to the axis of the heat collection tube 2 and is inclined towards the heat collection mechanism. Through the parabolic mirror 32 and the plane mirror 31, the light can be effectively reflected to the lower side of the heat collection tube 2, further ensuring the heat collection effect of the heat collection tube 2.

[0044] On the basis of the above structure, fins 23 are provided on both the upper and lower sides of the inner tube 22, and the planes where the fins 23 on the upper and lower sides of the inner tube 22 are located are vertical, so as to ensure the heat exchange effect between the light direct and reflection areas and the first working fluid.

[0045] As a preferred implementation manner, in order to further ensure the heat exchange effect between the fins 23 and the first working fluid in the light direct and reflection areas, fins 23 are also provided on both sides of the fins 23 vertically arranged on both the upper and lower sides of the inner tube 22, and the included angles between the planes where the fins 23 on both sides (the planes are not vertical) are located and the vertical direction are both 45°.

Claims

1. A marine dual-media solar collector, characterized in that: It comprises a support (5) and a heat preservation box (4) arranged thereon, wherein the heat preservation box (4) is open on the upper side and a heat collection mechanism is arranged inside the heat preservation box, and a glass cover plate (1) is arranged transversely at the opening; The heat collection mechanism comprises water and a plurality of heat collection tubes (2) arranged in parallel in the middle of the heat collection box, the heat collection tubes (2) comprising an inner tube (22) and an outer tube (21) which are coaxially sleeved and have a gap reserved in between, wherein a first working medium is filled between the inner tube (22) and the outer tube (21), and a second working medium is filled inside the inner tube (22); The inner tube (22) and the outer tube (21) are both reducer tubes, and the reducing trends are opposite. The outer ring of the inner tube (22) is also provided with fins (23). The fins (23) are strip-shaped plate structures arranged along the axial direction of the heat collecting tube (2) and are provided with a plurality of flow interference holes. The glass cover plate (1) has a rectangular cross section, and the long side of the rectangular cross section is consistent with the arrangement direction of the heat collecting tubes (2), and the wide side is consistent with the axial direction of the heat collecting tubes (2). The upper and lower surfaces of the glass cover plate (1) are respectively arc-shaped and protrude upward and downward. The shapes of the longitudinal sections along its length direction are consistent, and it is configured to be able to converge the incident light on the upper side of the heat collecting mechanism into a linear focusing area perpendicular to the axis of the heat collecting tube (2); It also includes a reflection mechanism (3) disposed between the bottom of the heat preservation box (4) and the heat collection mechanism, and is configured to be able to reflect incident light to the lower side of the heat collection tube (2).

2. A marine dual-media solar collector according to claim 1, characterized in that: The length of the fin (23) is consistent with that of the inner tube (22), and is an equal-width structure with one side being in contact with the inner tube (22); The fin (23) is provided with a first hole group in the 1 / 4 region at both ends, and a second hole group in the middle region; The first hole group includes two rows of spoiler holes, and the second hole group includes at least three rows of spoiler holes.

3. A marine duplex solar collector according to claim 2, characterized in that: The flow-disturbing hole is elliptical in shape, with a major axis direction being consistent with an axial direction of the heat collecting tube (2), and a minor axis direction being perpendicular to the axial direction of the heat collecting tube (2).

4. A marine duplex solar collector according to claim 3, characterized in that: The major axis length of the spoiler hole is 1 / 3 of the width of the fin (23), and the minor axis length is 1 / 4 of the width of the fin (23).

5. A marine duplex solar collector according to claim 4, characterized in that: The spoiler holes in adjacent rows of the first hole group and the spoiler holes in adjacent rows of the second hole group are staggered in position.

6. A marine duplex solar collector according to any one of claims 1 to 5, characterized in that: The distance between the linear focusing area and the inlet end of the heat collecting tube (2) is 1 / 12-1 / 4 of the length of the heat collecting tube (2).

7. A marine dual-media solar collector according to any one of claims 1 to 5, characterized in that: The upper surface of the glass cover plate (1) is coated with a fluorosilane hydrophobic coating.

8. A marine duplex solar collector according to any one of claims 1 to 5, characterized in that: The plurality of heat collecting tubes (2) are arranged in an alternating manner up and down.

9. A marine duplex solar collector according to any one of claims 1 to 5, characterized in that: The minimum inner diameters of the outer tube (21) and the inner tube (22) are both 3 / 4 of the maximum inner diameter, and the distance between the two tubes is 1 / 3-1 / 2 of the maximum inner diameter of the inner tube (22).

10. A marine dual-media solar collector according to any one of claims 1 to 5, characterized in that: The reflection mechanism (3) comprises a parabolic reflector (32) which is arranged corresponding to a plurality of heat collecting tubes (2) and is located at the lower side of the heat collecting tubes (2); The reflection mechanism (3) further comprises plane reflection mirrors (31) arranged on both sides of the bottom of the heat preservation box (4), wherein the mirror surface of the plane reflection mirror (31) is parallel to the axis of the heat collection tube (2) and is arranged inclined toward the heat collection mechanism.

Images