CN215809384U - Solar heat collecting pipe and solar heat collector thereof - Google Patents
Solar heat collecting pipe and solar heat collector thereof Download PDFInfo
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- CN215809384U CN215809384U CN202122345187.7U CN202122345187U CN215809384U CN 215809384 U CN215809384 U CN 215809384U CN 202122345187 U CN202122345187 U CN 202122345187U CN 215809384 U CN215809384 U CN 215809384U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/44—Heat exchange systems
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- Photovoltaic Devices (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
本实用新型公开一种太阳能集热管及其太阳能集热器，包括水管和套设在所述水管外的空气管，所述水管的外壁与所述空气管的内壁之间形成环形通道，所述环形通道内设置有螺旋式翼片，所述螺旋式翼片的内径侧和外径侧分别连接在所述水管的外壁上和所述空气管的内壁上，所述螺旋式翼片将所述环形通道划分成空气流通的螺旋通道，所述水管与所述螺旋式翼片均采用导热材料制成，所述空气管用于接受阳光照射并吸收太阳能；本实用新型能够利用螺旋式翼片支撑水管和空气管，还能形成水管和空气管之间的热量传递通道，既能将热量通过螺旋式翼片直接由空气管传递到水管，又能通过螺旋式翼片传递到螺旋通道内的空气后再传递到水管，进而能够提高热量传递的效率。
The utility model discloses a solar heat collector tube and a solar heat collector thereof, comprising a water tube and an air tube sleeved outside the water tube, an annular channel is formed between the outer wall of the water tube and the inner wall of the air tube, and the The annular channel is provided with helical fins, the inner diameter side and the outer diameter side of the helical fins are respectively connected to the outer wall of the water pipe and the inner wall of the air pipe, and the helical fins connect the The annular channel is divided into spiral channels for air circulation, the water pipes and the spiral fins are made of thermally conductive materials, and the air pipes are used to receive sunlight and absorb solar energy; the utility model can use the spiral fins to support the water pipes And the air pipe, it can also form a heat transfer channel between the water pipe and the air pipe, which can not only transfer the heat directly from the air pipe to the water pipe through the helical fins, but also transfer the heat to the air in the helical channel through the helical fins. It is then transferred to the water pipe, which can improve the efficiency of heat transfer.
Description
Technical Field
The utility model relates to the technical field of solar energy utilization, in particular to a solar heat collecting pipe and a solar heat collector thereof.
Background
Solar energy utilization technology is rapidly developed today with global energy utilization and increasingly non-renewable energy consumption. The key of the solar heat utilization technology is to convert the radiant energy of the sun into heat energy, and a solar heat collector is a core device for realizing the conversion process.
Most of solar heat collectors in the current market are vacuum tube type heat collectors taking water as a heating working medium and serving as core components of solar water heaters to provide domestic hot water for buildings, but the solar water heaters are generally single in use; meanwhile, the solar heat collector taking air as a medium in the market also has a vacuum tube form, and the problems of heating, drying and the like are effectively solved. However, devices are emerging in which both media can be heated simultaneously on one device.
Application publication No. CN 108204682A's Chinese patent discloses a solar energy air water heat collector, including the cold water storage cistern, holding water box, heat accumulation jar and heat collector, holding water box is connected to the heat collector upper end, the heat collector includes many thermal-collecting tubes, every thermal-collecting tube is including the body that is located the centre and the thermal-collecting plate of body both sides, the medium in the body is water, the thermal-collecting plate is hollow structure, the medium in it is the air, that is to say, this scheme can heat water and can heat the air again, but, can only heat the air earlier during the heating, reuse air heating water, only utilize hot water and can not lead to the problem that heat transfer slows down or heat transfer efficiency is lower when not utilizing the hot-blast, when only utilizing hot-blast and not utilizing hot-water, because the unordered circulation of air, also can lead to the efficiency of air heating lower.
Chinese patent application publication No. CN 105546855 a discloses a heat transfer enhancing large-diameter evacuated collector tube, which comprises a large-diameter glass outer tube, a large-diameter metal absorption tube, a spiral fin arranged inside the metal absorption tube, and a hollow circular tube supporting the fin, wherein the spiral fin is wound outside the hollow circular tube, the hollow circular tube is fixed on the inner surface of the metal absorption tube through a radiation type support, the diameter of the metal absorption tube in the scheme is larger than the numerical range of the conventional evacuated collector tube, the sunlight absorption area of the metal absorption tube is increased by the increased diameter, the light interception rate of the metal absorption tube is improved, the adaptability to the optical error of the system is enhanced, meanwhile, the disturbance to the internal fluid is increased by the spiral fin arranged in the metal absorption tube, the internal heat transfer is enhanced, the utilization rate of the sunlight in unit area is improved, however, the scheme does not provide a record that two media can be heated simultaneously, there is no motivation or suggestion that it can be used for heating air and water, and therefore, it can be obtained from this scheme that it can be used only for heating one fluid, and it can transfer heat to the inner diameter side thereof only by using the wall of the metal absorption tube when heating the inner fluid, and it cannot effectively improve the heating efficiency thereof.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a solar heat collecting pipe and a solar heat collector thereof, which are used for solving the problems in the prior art, wherein a spiral fin is arranged between a water pipe and an air pipe and is respectively connected with the outer wall of the water pipe and the inner wall of the air pipe, the water pipe and the air pipe can be supported by the spiral fin, meanwhile, a heat transfer channel between the water pipe and the air pipe can be formed, heat can be directly transferred to the water pipe from the air pipe through the spiral fin and can also be transferred to the water pipe after being transferred to the air in the spiral channel through the spiral fin, and further, the heat transfer efficiency can be improved.
In order to achieve the purpose, the utility model provides the following scheme:
the utility model provides a solar heat collecting pipe which comprises a water pipe and an air pipe sleeved outside the water pipe, wherein an annular channel is formed between the outer wall of the water pipe and the inner wall of the air pipe, a spiral fin is arranged in the annular channel, the inner diameter side and the outer diameter side of the spiral fin are respectively connected to the outer wall of the water pipe and the inner wall of the air pipe, the spiral fin divides the annular channel into spiral channels for air circulation, the water pipe and the spiral fin are both made of heat conducting materials, and the air pipe is used for receiving sunlight irradiation and absorbing solar energy.
Preferably, the air pipe comprises an inner pipe and an outer pipe, and a vacuum interlayer is arranged between the inner pipe and the outer pipe.
Preferably, the outer wall of the inner tube is painted with a selectively absorbing coating.
Preferably, a support member is arranged in the vacuum interlayer, the support member is a sheet-shaped elastic metal element formed by staggering a plurality of wave crests and wave troughs, and the inner side and the outer side of the support member are respectively attached to the outer wall of the inner pipe and the inner wall of the outer pipe.
The utility model also provides a solar heat collector which comprises a plurality of solar heat collecting pipes, wherein the water pipes of different solar heat collecting pipes are respectively converged into a water inlet and a water outlet, and the air pipes of different solar heat collecting pipes are converged into an air inlet and an air outlet.
Preferably, the solar heat collecting pipe comprises an upper header and a lower header, wherein the bottom of the upper header and the top of the lower header are respectively provided with an inserting hole, the inserting holes are used for being in sealing connection with the solar heat collecting pipe, the air inlet and the water inlet are formed in the lower header, and the air outlet and the water outlet are formed in the upper header.
Preferably, the difference the parallelly connected intercommunication of water pipe, the import of water pipe all communicates same inlet tube, the export of water pipe all communicates same outlet pipe, simultaneously, the difference the parallelly connected intercommunication of air hose, the import of air hose all communicates same air inlet duct, the export of air hose all communicates same exhaust duct.
Preferably, the inlet tube sets up inside the air inlet duct, the outlet pipe sets up inside the exhaust passage, the air inlet duct does the inner space of header down, the exhaust passage does the inner space of last header.
Preferably, the air inlet and the water inlet are respectively arranged at two ends of the lower header, and the air outlet and the water outlet are respectively arranged at two ends of the upper header.
Preferably, the air inlet or the air outlet is provided with a fan, and the water inlet or the water outlet is provided with a water pump.
Compared with the prior art, the utility model has the following technical effects:
(1) the spiral fins are arranged between the water pipe and the air pipe and are respectively connected with the outer wall of the water pipe and the inner wall of the air pipe, the water pipe and the air pipe can be supported by the spiral fins, and meanwhile, a heat transfer channel between the water pipe and the air pipe can be formed, so that heat can be directly transferred from the air pipe to the water pipe through the spiral fins and can be transferred to the water pipe after being transferred to air in the spiral channel through the spiral fins, and further, the heat transfer efficiency can be improved;
(2) according to the utility model, the supporting piece is arranged in the vacuum interlayer of the air pipe, when the temperature of the inner pipe is raised due to the absorption of solar radiation, the temperature difference exists due to the uneven heating of the pipe wall surface, the expansion deformation or the contraction deformation of each part caused by expansion with heat and contraction with cold are inconsistent, so that the internal stress is generated due to mutual constraint, the stress is thermal stress, and the arrangement of the supporting piece can well buffer the thermal stress, so that the air pipe is protected and prevented from deformation and fracture;
(3) different water pipes are communicated in parallel, on one hand, according to the characteristic that the total flow between two nodes of a parallel pipeline is equal to the sum of the flow of each branch, the instantaneous water capacity in the pipeline is integrally expanded, on the other hand, according to the characteristic that the total resistance loss between two nodes of the parallel pipeline is equal to the resistance loss of each branch, the water flow resistance in the water pipes is comprehensively reduced, and therefore the electric energy consumed by mechanical equipment for providing power for conveying hot water is saved;
(4) the air inlet and the water inlet are respectively arranged at two ends of the lower header, the air outlet and the water outlet are respectively arranged at two ends of the upper header, namely, the outflow ends of the heating working medium are both designed at two ends of the upper header, and the inflow ends of the working medium to be heated are both designed at two ends of the lower header, so that the working medium can move upwards due to temperature rise and density reduction after being heated, and meanwhile, the cold working medium with high specific gravity is lowered, thereby forming natural convection and enhancing the flow of the working medium.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic cross-sectional view of the present invention;
FIG. 2 is a schematic cross-sectional view of a solar heat collecting tube according to the present invention;
FIG. 3 is a schematic view of the internal structure of the solar heat collecting tube of the present invention;
FIG. 4 is a schematic structural view of an upper header of the present invention;
FIG. 5 is a schematic view of the connection structure of the solar heat collecting tube and the lower header of the present invention;
wherein, 1, connecting the header; 11. inserting holes; 111. sealing the rubber ring; 2. a lower header; 3. an air tube; 31. an outer tube; 32. vacuum interlayer; 33. an inner tube; 34. a selective absorbing coating; 35. a support member; 4. a water pipe; 41. a water inlet pipe; 411. a water inlet; 42. a riser; 43. a water outlet pipe; 431. a water outlet; 432. an outer insulation structure; 5. a helical fin; 6. an air inlet duct; 61. an air inlet; 7. an air outlet channel; 71. an air outlet; 8. a spiral channel; 9. a flange plate; 10. a solar heat collector.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The utility model aims to provide a solar heat collecting pipe and a solar heat collector thereof, which are used for solving the problems in the prior art, wherein a spiral fin is arranged between a water pipe and an air pipe and is respectively connected with the outer wall of the water pipe and the inner wall of the air pipe, the water pipe and the air pipe can be supported by the spiral fin, meanwhile, a heat transfer channel between the water pipe and the air pipe can be formed, heat can be directly transferred to the water pipe from the air pipe through the spiral fin and can also be transferred to the water pipe after being transferred to the air in the spiral channel through the spiral fin, and further, the heat transfer efficiency can be improved.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1 to 3, the utility model provides a solar heat collecting tube, which comprises a water tube 4 and an air tube 3 sleeved outside the water tube 4, wherein the water tube 4 and the air tube 3 can be both in the shape of a circular structure, an oval structure and the like, preferably in the shape of a circular structure, the water tube 4 and the air tube 3 can be concentrically arranged, and generally, the water tube 4 can be made of a metal material; the air pipe 3 can be made of a glass pipe, and the water pipe 4 can be selected to be the same pressure bearing water pipe 4. An annular passage is formed between the outer wall of the water pipe 4 and the inner wall of the air pipe 3, the diameter of the water pipe 4 can be much smaller than that of the air pipe 3, and at this time, the cross-sectional area of the annular passage is larger than that of the water pipe 4, that is, the flow cross-section of air is larger than that of water. The annular channel is internally provided with a spiral fin 5, the inner diameter side and the outer diameter side of the spiral fin 5 are respectively connected on the outer wall of the water pipe 4 and the inner wall of the air pipe 3, and the connection can be in a welding connection (the water pipe 4 and the spiral fin 5 can be welded when both adopt heat-conducting metal materials) or a bonding connection (the outer diameter side of the spiral fin 5 is fixed with the inner wall of the air pipe 3 in a bonding connection mode through coating UV glue, namely ultraviolet curing glue) and other connection modes. Spiral fin 5 divides annular channel into circulation of air's helical channel 8, and when solar energy collection pipe was used for heated air and outwards carried the hot-air, the air flowed along helical channel 8, can strengthen the disturbance of air current, and increased the heat transfer time of air in air pipe 3 to improve solar energy heated air's utilization ratio. The water pipe 4 and the spiral fins 5 are made of heat conducting materials, for example, materials such as aluminum, copper or iron can be selected to be made of the heat conducting materials, and the heat conducting efficiency can be improved through the application of the heat conducting materials. The air tube 3 is used for receiving sunlight irradiation and absorbing solar energy, and a material which is beneficial to absorbing solar energy can be arranged on the air tube 3. According to the utility model, the spiral fins 5 are arranged between the water pipe 4 and the air pipe 3, and the spiral fins 5 are respectively connected with the outer wall of the water pipe 4 and the inner wall of the air pipe 3, so that the water pipe 4 and the air pipe 3 can be supported by the spiral fins 5, and meanwhile, a heat transfer channel between the water pipe 4 and the air pipe 3 can be formed, heat can be directly transferred from the air pipe 3 to the water pipe 4 through the spiral fins 5, and can also be transferred to the air in the spiral channel 8 and then transferred to the water pipe 4 through the spiral fins 5, and further, the heat transfer efficiency can be improved.
The air tube 3 can include inner tube 33 and outer tube 31, be vacuum interlayer 32 between inner tube 33 and the outer tube 31, vacuum interlayer 32 can reduce the heat loss, plays the heat retaining effect, and wherein, outer tube 31, inner tube 33 can be made by the better and higher borosilicate glass material of hardness of thermal stability, and the both ends of air tube 3 can be sealed by inner tube 33 and outer tube 31 annular melt, form the enclosed construction.
The selective absorbing coating 34 can be coated on the outer wall of the inner tube 33, the selective absorbing coating 34 is coated on the surface of the outer wall of the inner tube 33, and the selective absorbing coating 34 can be made of solar selective absorbing paint such as copper oxide, black nickel, black chromium, black zinc, black copper and the like, so that the solar radiation energy absorbing capacity of the air tube 3 can be improved.
The vacuum interlayer 32 can be internally provided with a supporting piece 35, the inner side and the outer side of the supporting piece 35 are respectively attached to the outer wall of the inner pipe 33 and the inner wall of the outer pipe 31, the supporting piece 35 is a sheet-type elastic metal element formed by staggering a plurality of wave crests and wave troughs, is in a wave-type circular ring shape, can be made of carbon steel or alloy steel materials, can be provided with a plurality of air pipes 3, are distributed and arranged along the axial direction of the vacuum interlayer 32, for example, can be provided with two air pipes, and are respectively clamped on the upper half part and the lower half part of the vacuum interlayer 32. During specific installation, the outer wall of the inner tube 33 can be provided with three small circular arc inner grooves at the contact points with the wave troughs of the supporting member 35, the wave crests of the supporting member 35 are supported on the inner wall of the outer tube 31, the whole supporting member 35 is in a semi-compressed state, and the position of the supporting member 35 in the vacuum interlayer 32 is ensured to be fixed due to the elastic force caused by elastic deformation; when the temperature of the inner tube 33 is increased by absorbing solar radiation, the tube wall surface is heated unevenly, so that the temperature difference exists, the expansion deformation or the contraction deformation of each part caused by expansion with heat and contraction with cold are inconsistent, and the mutual constraint generates internal stress, namely thermal stress, and the arrangement of the support member 35 can well buffer the thermal stress, so that the air tube 3 is protected and prevented from deformation and cracking.
As shown in fig. 1 to 5, the present invention further provides a solar thermal collector 10, which includes a plurality of solar thermal collecting tubes as described above, wherein the water pipes 4 of different solar thermal collecting tubes are respectively collected into a water inlet 411 and a water outlet 431, and it should be noted that when the water pipes 4 are collected, the water pipes 4 may be connected in series or in parallel; the air tubes 3 of different solar heat collecting tubes are converged into an air inlet 61 and an air outlet 71, and similarly, when the air tubes 3 are converged, the air tubes 3 can be connected in series or in parallel.
The solar heat collector 10 also comprises an upper header 1 and a lower header 2, which are used for connecting a plurality of solar heat collecting pipes and forming a conveying pipeline for air and water; specifically, rows of inserting holes 11 are formed in the bottom of the upper header 1 and the top of the lower header 2, sealing rubber rings 111 are arranged in the inserting holes 11, the sealing rubber rings 111 have shapes and sizes matched with the outer wall of the outer pipe 31, and the solar heat collecting pipes can be connected with the upper header 1 and the lower header 2 in a sealing mode; the upper header 1 and the lower header 2 may be made of stainless steel. Air intake 61 and water inlet 411 can set up on header 2 down, and air outlet 71 and delivery port 431 can set up on last header 1, that is to say, the heating working medium outflow end all designs on last header 2, treats that the heating working medium inflow end all designs on header 2 down, can make the working medium be heated the back because of the temperature rise, density diminishes and upward movement, and the cold working medium that proportion is big descends simultaneously to form natural convection, strengthen the flow of working medium.
The inlet tube 41 can be arranged in the air inlet duct 6, the outlet tube 43 can be arranged in the air outlet duct 7, the air inlet duct 6 is the inner space of the lower header 2, and the air outlet duct 7 is the inner space of the upper header 1, therefore, the upper header 1 and the lower header 2 can be used as the structure for supporting and connecting the solar heat collecting tubes and can also be used as the structure for air circulation. The joints of the water inlet pipe 41 and the water outlet pipe 43 and each vertical pipe 42 are connected in a flange mode, the flange plate 9 is arranged, assembly and disassembly are convenient, and the disassembled water inlet pipe 41 and the water outlet pipe 43 can be taken out from the air inlet 61 and the air outlet 71 respectively. The water inlet pipe 41 at the water inlet 411 is connected with the lower header in a sealing way, and the water outlet pipe 43 at the water outlet 431 is connected with the upper header in a sealing way.
The air inlet 61 and the water inlet 411 may be respectively disposed at two ends of the lower header 2, and the air outlet 71 and the water outlet 431 may be respectively disposed at two ends of the upper header 1, that is, the air inlet 61 and the water inlet 411 do not affect each other during air inlet or water inlet, and the air outlet 71 and the water outlet 431 do not affect each other during air outlet and water outlet. However, due to the arrangement mode, the flow directions of the two working mediums in the upper header 1 and the lower header 2 are opposite, at this time, the outer heat-insulating structure 432 can be wrapped outside the water outlet pipe 43 of the upper header 1 to reduce the heat exchange between the water outlet pipe 43 and the air outlet channel 7, and the outer heat-insulating structure 432 can be made of materials with poor heat transfer effect, such as rubber and plastic materials; in addition, because the two working mediums in the lower header 2 are cold fluids, the two working mediums hardly have heat exchange or have little heat exchange and can be ignored, and the outer heat-insulating structure 432 can not be arranged outside the water inlet pipe 41.
A fan can be arranged at the air inlet 61 or the air outlet 71, a water pump can be arranged at the water inlet 411 or the water outlet 431, and the arrangement of the fan and the water pump can ensure the smooth flowing of the medium; the connecting parts of the air inlet duct 6, the air outlet duct 7 or the upper header 1 and the lower header 2 and the two ends of the air pipe 3 can be provided with air guide wheels, so that the uniform air inlet and outlet can be ensured, and the erosion to the water inlet pipe 41 and the water outlet pipe 43 can be reduced; the whole solar heat collector 10 can be fixed by an inclined triangular support frame, and a CPC (compound parabolic concentrator) reflector can be additionally arranged below the air pipe 3 (on one side of backlight) so as to improve the solar energy utilization rate and the heat collection efficiency of the solar heat collector 10.
The working principle of the utility model is as follows:
when receiving sunlight, solar radiation is irradiated on the inner pipe 33 of the air pipe 3 coated with the selective absorption coating 34, the selective absorption coating layer 34 converts the absorbed solar radiation energy into heat energy, and the converted heat energy is sequentially conducted to the spiral fins 5 hermetically bordering the inner pipe 33 and the stand pipe 42 welded with the spiral fins 5, or the converted heat energy is sequentially conducted to the spiral fins 5 and the air in the spiral passage 8 and then is conducted to the stand pipe 42. The vacuum interlayer 32 between the inner pipe 33 and the outer pipe 31 reduces heat loss and plays a role in heat preservation. When working media are introduced, cold water flows into the water inlet pipe 41 from the water inlet 411 at one end of the lower part of the solar thermal collector 10, is heated by the parallel vertical pipe 42, finally flows through the water outlet pipe 43 and uniformly flows out from the water outlet 431 at one end of the upper part of the solar thermal collector 10 to produce hot water for users to use; similarly, cold air flows into the air inlet duct 6 from the air inlet 61 at the other end of the lower part of the solar heat collector 10, is heated by the spiral channel 8, and finally flows through the air outlet duct 7 and uniformly flows out from the air outlet 71 at the other end of the upper part of the solar heat collector 10, so that hot air is produced and supplied to users. In the process of working medium heating, two working media of air and water respectively flow through two completely isolated heating paths which are not communicated with each other, namely the two working media do not have mass exchange in the process of flowing through the inside of the whole solar heat collector 10, cannot obstruct the mutually independent operation, and can be independently and simultaneously output and supplied. However, when the two working mediums are heated and supplied simultaneously, heat exchange is generated between the two working mediums, so that the effect of mutually absorbing heat is influenced and restricted, and of course, the heat can be transferred from the medium with relatively high temperature to the medium with relatively low temperature by utilizing the heat exchange. When the solar heating device is used under the natural conditions of sufficient sunlight irradiation and high solar radiation intensity, the requirements for heating cold water and air can be met. The outside of the water outlet pipe 43 of the upper header 1 is wrapped with a heat insulation structure 432 for avoiding heat transfer between air and water.
The principle and the implementation mode of the utility model are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the utility model; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the utility model.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN113739426A (en) * | 2021-09-27 | 2021-12-03 | 中国建筑科学研究院有限公司 | Solar heat collecting pipe and solar heat collector thereof |
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| CN113739426A (en) * | 2021-09-27 | 2021-12-03 | 中国建筑科学研究院有限公司 | Solar heat collecting pipe and solar heat collector thereof |
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