CN105066484A - Device and method for measuring radiation intensity of surface of metal pipe in trough type solar heat collector pipe - Google Patents
Device and method for measuring radiation intensity of surface of metal pipe in trough type solar heat collector pipe Download PDFInfo
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- CN105066484A CN105066484A CN201510438333.7A CN201510438333A CN105066484A CN 105066484 A CN105066484 A CN 105066484A CN 201510438333 A CN201510438333 A CN 201510438333A CN 105066484 A CN105066484 A CN 105066484A
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- 230000005855 radiation Effects 0.000 title claims abstract description 78
- 239000002184 metal Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000011521 glass Substances 0.000 claims abstract description 15
- 238000005057 refrigeration Methods 0.000 claims abstract description 5
- 238000005286 illumination Methods 0.000 claims description 60
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 230000000630 rising effect Effects 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 2
- 238000005094 computer simulation Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
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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
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- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Photovoltaic Devices (AREA)
Abstract
The invention discloses a device and method for measuring the radiation intensity of the surface of a metal pipe in a trough type solar heat collector pipe. The device mainly comprises a trough type light condenser, the vacuum heat collector pipe, light irradiation intensity measuring modules and a refrigeration fan. The light irradiation intensity measuring modules are symmetrically installed on the extending portions of the two ends of the vacuum heat collector pipe. The metal pipe in the vacuum heat collector pipe is replaced with a high-temperature-resistant plastic pipe, N narrow photovoltaic cell strips are evenly attached to the surface of the plastic pipe, and marginal rays enter the light irradiation intensity measuring module, penetrate through a glass pipe and then are irradiated to the narrow photovoltaic cell strips. The light irradiation intensity can be read in real time through digital display devices. The device is compact in structure, makes full use of the marginal rays which can not be used by a common trough type solar heat collector, does not need to be additionally provided with a large number of support structures, and can measure the light irradiation intensity on the surface of the metal pipes in real time through digital indexes.
Description
Technical Field
The invention relates to a device and a method for measuring the surface radiation intensity of a metal pipe in a groove type solar heat collecting pipe, and belongs to the technical field of solar heat collectors.
Background
The trough type solar heat collector is the line focusing type solar heat collector with the highest commercialization degree at present. The trough solar collector focuses solar radiant energy to the outer surface of the evacuated collector tube using a high reflectivity trough concentrator. The reflecting surface of the trough type solar heat collector is generally a trough type paraboloid formed by splicing a plurality of arc-shaped mirror surfaces. Meanwhile, the vacuum heat collecting tube is positioned above the paraboloid, the axis of the vacuum heat collecting tube is coincided with the focus of the paraboloid, and the vacuum heat collecting tube is fixed with the rotating shaft of the groove type condenser by adopting a steel frame structure. The illumination radiation intensity of the surface of a metal tube in the vacuum heat collecting tube of the prior trough type solar heat collector is a numerical value obtained by computer software simulation. In the actual operation process of the trough type solar heat collector, the illumination radiation intensity on the surface of the metal tube is difficult to directly measure, sunlight irradiates the lower part of the vacuum heat collecting tube after being focused, and light rays penetrate through the glass tube and irradiate the lower part of the metal tube, so that local overheating of the lower part of the metal tube can be caused, and the metal tube is bent, deformed and even damaged. In view of the above, there is a need for a device capable of measuring and feeding back the illumination radiation intensity on the surface of the metal tube in the trough-type solar vacuum heat collecting tube in real time in real environment.
Disclosure of Invention
In order to overcome the defects of the existing computer simulation technology, the invention provides a device and a method for measuring the surface radiation intensity of a metal tube in a groove type solar energy heat collecting tube, which can measure and feed back the illumination radiation intensity of the surface of the metal tube in the groove type solar energy vacuum heat collecting tube in real time, and output and display the illumination radiation intensity of the surface of the metal tube in a digital mode, so that experimenters can compare with the simulation result of a computer and further optimize the simulation result.
In order to achieve the purpose, the invention adopts the following technical scheme:
the device for measuring the radiation intensity of the surface of the metal pipe in the groove type solar heat collecting pipe comprises a groove type condenser, a vacuum heat collecting pipe, an illumination radiation intensity measuring module, a refrigerating fan and a digital display device; the groove type condenser is a groove type paraboloid formed by splicing a plurality of arc mirror surfaces, the vacuum heat collecting tube is positioned above the groove type condenser, the axis of the vacuum heat collecting tube is superposed with the focus of the groove type paraboloid, and the vacuum heat collecting tube is fixed with a rotating shaft of the groove type condenser by adopting a steel frame structure;
symmetrically installing steel frames at the edge positions of two sides of the trough type solar heat collector, arranging metal rings at the upper ends of the steel frames and having the same axle center with the vacuum heat collecting tube, and symmetrically installing illumination radiation intensity measuring modules on the steel frames; the device comprises an illumination radiation intensity measuring module, a vacuum heat collecting pipe, a glass pipe, a high-temperature resistant plastic pipe and a small fan, wherein the illumination radiation intensity measuring module consists of narrow photovoltaic cell strips, a metal pipe, the high-temperature resistant plastic pipe and the small fan, the axis of the illumination radiation intensity measuring module is coaxial with the vacuum heat collecting pipe, the high-temperature resistant plastic pipe is arranged in the glass pipe, the outer surface of the high-temperature resistant plastic pipe is coated with an insulating layer, and N narrow photovoltaic cell strips are uniformly attached to the; and the output of each narrow photovoltaic cell strip is connected with a digital display device.
And a small fan is arranged at the tail end of the high-temperature resistant plastic pipe.
The edge of the tail end of the illumination radiation intensity measuring module is coaxially provided with a refrigerating fan, and the refrigerating fan is driven by a driving motor.
The N narrow photovoltaic cell strips installed in the illumination radiation intensity measuring module have the same physical and chemical characteristics, and the size of N depends on the requirement of measuring accuracy.
The measuring method of the device for measuring the surface radiation intensity of the metal pipe in the groove type solar heat collecting pipe comprises the following steps:
(1) the groove type solar heat collector focuses solar rays onto the surface of the vacuum heat collecting pipe by using the groove type condenser, and edge rays can be generated at the edge of the groove type condenser in the process of rising and falling of the sun;
(2) the edge light rays enter the illumination radiation intensity measuring module after being reflected, firstly penetrate through the glass tube, then irradiate the glass tube on N narrow photovoltaic cell strips on the outer surface of the plastic tube, and generate potential difference on each narrow photovoltaic cell strip, namely the narrow photovoltaic cell strips convert the solar radiation energy of the edge light rays into electric signals and display the electric signals through the digital display device;
(3) the illumination radiation intensity of different positions on the surface of the metal tube in the vacuum heat collecting tube is obtained by comparing the electric signals of the narrow photovoltaic cell strips at different positions on the circumference of the plastic tube;
(4) meanwhile, the electric quantity generated by the narrow photovoltaic cell strip in the illumination radiation intensity measuring module drives the refrigerating fan at the edge of the tail end of the illumination radiation intensity measuring module to rotate so as to refrigerate the illumination radiation intensity measuring module;
(5) the wind generated by the refrigerating fan drives the small fan at the tail end of the plastic pipe of the illumination radiation intensity measuring module to coaxially rotate, so that the narrow photovoltaic battery strip group is driven to slowly rotate.
Compared with the prior art, the invention has the following innovation points: 1. the marginal light rays generated by the groove type solar heat collector are fully and reasonably utilized, and the light intensity of the marginal light rays is utilized to irradiate the narrow photovoltaic cell strips to generate electric energy; 2. converting the circumferential illumination radiation intensity on the surface of the metal pipe into an electric signal; 3. the invention has compact structure, does not need to additionally install a large number of brackets and can measure the illumination radiation intensity of the surface of the metal pipe in real time through digital display; 4. the electric quantity that make full use of photovoltaic cell strip production drives the rotation of refrigeration fan and gives illumination radiation intensity measuring module refrigeration and drive the plastic tubing of illumination radiation intensity measuring module and rotate slowly, prevents that photovoltaic cell strip from being burnt out.
Drawings
FIG. 1 is a structural diagram of a device for measuring the surface radiation intensity of a metal tube in a trough-type solar heat collecting tube according to the present invention;
FIG. 2 is an optical path diagram of a device for measuring the surface radiation intensity of a metal tube in a trough-type solar heat collecting tube according to the present invention;
FIG. 3 is a top view of the device for measuring the surface radiation intensity of the metal tube in the trough-type solar heat collecting tube according to the present invention;
FIG. 4 is a sectional view of an illumination radiation intensity measuring module and a flow route diagram of cooling wind according to the present invention;
fig. 5 is a distribution diagram of a narrow photovoltaic cell strip in an illumination radiation intensity measurement module of the present invention.
In the figure: 1. the solar energy collecting device comprises a groove type condenser, 2 vacuum heat collecting pipes, 3 illumination radiation intensity measuring modules, 4 refrigerating fans, 5 digital display devices, 6 driving motors, 7 narrow photovoltaic cell strips, 8 insulating layers, 9 plastic pipes, 10 glass pipes, 11 small fans, 12 edge rays and 13 solar rays capable of being received by the vacuum heat collecting pipes.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings and detailed description.
As shown in fig. 1 and 3, the illumination radiation intensity measuring device of the present invention mainly includes a trough-type condenser 1, a vacuum heat collecting tube 2, an illumination radiation intensity measuring module 3, a refrigerating fan 4, and a digital display device 5. Wherein,
the groove type condenser 1 is a groove type paraboloid formed by splicing a plurality of arc-shaped mirror surfaces, the vacuum heat collecting tube 2 is positioned above the groove type condenser 1, the axis of the vacuum heat collecting tube 2 is superposed with the focus of the groove type paraboloid, and the vacuum heat collecting tube 2 is generally fixed with the rotating shaft of the groove type condenser 1 by adopting a steel frame structure.
The edge positions of two sides of the groove type solar heat collector are symmetrically provided with a steel frame, a metal ring at the upper end of the steel frame and the vacuum heat collecting tube 2 are coaxial, and the steel frame is provided with an illumination radiation intensity measuring module 3.
As shown in fig. 3, 4 and 5, the irradiation intensity measuring module 3 is formed by modifying the evacuated collector tube, and has 2 irradiation intensity measuring modules, and the irradiation intensity measuring modules are symmetrically installed at the extending parts at two ends of the evacuated collector tube 2, each irradiation intensity measuring module 3 is composed of a narrow photovoltaic cell strip 7, a plastic tube 9, a glass tube 10 and a small fan 11, and the axis of the irradiation intensity measuring module 3 is coaxial with the evacuated collector tube 2. Wherein, a plastic tube 9 is arranged in the glass tube 10, a layer of insulating layer 8 is coated on the outer surface of the plastic tube 9, N narrow photovoltaic cell strips are uniformly attached to the outer surface of the plastic tube 9 in the circumferential direction, and a small fan 11 is arranged at the tail end of the plastic tube 9. The illumination radiation intensity measuring module of the invention replaces the metal tube in the vacuum heat collecting tube with a high temperature resistant plastic tube to reduce the weight. The N narrow photovoltaic cell strips 7 installed in the illumination radiation intensity measurement module 3 have the same physicochemical characteristics, the size of N depends on the requirement of measurement accuracy, the higher the requirement of measurement accuracy is, the larger the value of N is, for example, N is 12 in the specific embodiment of the present invention.
The output of each narrow photovoltaic cell strip 7 is connected with a digital display device 5.
In order to prevent the focused edge light 12 from burning the narrow photovoltaic cell strip 7, the refrigerating fan 4 is coaxially installed at the edge of the tail end of the illumination radiation intensity measuring module 3, so that the illumination radiation intensity measuring module 3, the refrigerating fan 4 and the vacuum heat collecting tube 2 are coaxial, the refrigerating fan 4 is driven by the driving motor 6, air in the illumination radiation intensity measuring module 3 flows, and the narrow photovoltaic cell strip is cooled.
The wind generated by the refrigerating fan 4 can drive the small fan 11 on the plastic pipe 9 of the illumination radiation intensity measuring module 3 to coaxially rotate, so that the narrow photovoltaic battery strip group is driven to slowly rotate.
The edge light irradiates on the narrow photovoltaic cell strips 7 at different positions to generate potential difference in the narrow photovoltaic cell strips 7, on one hand, electric energy generated by the narrow photovoltaic cell strips 7 can be used for driving the refrigerating fan 4 to rotate, in addition, the narrow photovoltaic cell strips 7 are connected with the digital display device 5, the potential difference of the narrow photovoltaic cell strips 7 at different circumferential positions can be displayed, the illumination radiation intensity of the plastic pipe 9 at different circumferential positions can be known through the numbers on the digital display device 5, and the illumination radiation intensity is equivalent to the irradiation intensity on the metal pipe in the vacuum heat collecting pipe.
The working principle of the invention is analyzed in detail as follows: during the operation of the sun in the sky, since the sun cannot directly irradiate the trough concentrator 1 of the collector at any time, a part of light rays at the edge of the trough concentrator 1 cannot irradiate the evacuated collector tube 2, which is called edge light rays 12, as shown in fig. 2. The core principle of the present invention is to use the sunlight reflected to the outside of the evacuated collector tube 2 to measure the illumination radiation intensity of the surface of the metal tube in the evacuated collector tube 2 by using the edge light 12. The illumination radiation intensity of the plastic tube 9 in the circumferential direction is measured in real time through the digital display device 5, and the illumination radiation intensity is equivalent to the illumination radiation intensity of the surface of a metal tube in the vacuum heat collecting tube 2. Meanwhile, in order to prevent the narrow photovoltaic cell strips 7 from being burnt by the focused solar rays, the electric energy generated by the narrow photovoltaic cell strips 7 is used for driving the refrigerating fan 4 to rotate to refrigerate the narrow photovoltaic cell strips 7 and drive the narrow photovoltaic cell strip group to rotate slowly.
The specific work engineering of the invention is as follows:
(1) the trough solar collector uses a larger trough condenser 1 to focus sunlight on the surface of a vacuum heat collecting tube 2. For a trough concentrator 1 which tracks the sun in the east-west direction, during the east-west falling of the sun, edge rays 12 are generated from the west to the east of the edge of the trough concentrator 1; for the trough type condenser 1 arranged in the north-south direction, the heat collector tracks the sun from east to west in real time, and edge rays 12 are generated at the edge positions of the two ends of the vacuum heat collecting tube 2. The marginal ray 12 is difficult to be utilized by the evacuated collector tube 2, generally, the source of heat loss of the evacuated collector tube 2 is counted, the marginal ray 12 has completely similar properties to the solar ray 13 focused on the evacuated collector tube 2 and capable of being received by the evacuated collector tube, the marginal ray 12 not only can measure the illumination radiation intensity focused on the surface of the metal tube of the evacuated collector tube 2, but also can utilize the partial lost ray so as to reduce the total loss of the system.
(2) The edge light 12 enters the illumination radiation intensity measuring module 3 after being reflected, firstly penetrates through the glass tube 10, then irradiates on the N narrow photovoltaic cell strips 7 on the outer surface of the plastic tube 9 in the glass tube 10, and generates a potential difference on each narrow photovoltaic cell strip, namely the narrow photovoltaic cell strips convert the solar radiation energy of the edge light into electric signals and display the electric signals through the digital display device 5.
(3) The illumination radiation intensity of different positions on the surface of the metal tube in the vacuum heat collecting tube is obtained by comparing the electric signals of the narrow photovoltaic cell strips at different positions on the circumference of the plastic tube.
(4) Meanwhile, the electric quantity generated by the narrow photovoltaic cell strip 7 in the illumination radiation intensity measuring module 3 drives the refrigerating fan 4 at the edge of the tail end of the illumination radiation intensity measuring module 3 to rotate, so that the illumination radiation intensity measuring module is refrigerated.
(5) The small fan 11 on the plastic pipe of the illumination radiation intensity measuring module can be driven to coaxially rotate by the wind generated by the refrigerating fan 4, so that the narrow photovoltaic cell strip group is driven to slowly rotate, and the narrow photovoltaic cell strips 7 are prevented from being burnt by focused sunlight.
Claims (5)
1. The device for measuring the surface radiation intensity of the metal tube in the groove type solar heat collecting tube is characterized by comprising a groove type condenser, a vacuum heat collecting tube, an illumination radiation intensity measuring module, a refrigerating fan and a digital display device; the groove type condenser is a groove type paraboloid formed by splicing a plurality of arc mirror surfaces, the vacuum heat collecting tube is positioned above the groove type condenser, the axis of the vacuum heat collecting tube is superposed with the focus of the groove type paraboloid, and the vacuum heat collecting tube is fixed with a rotating shaft of the groove type condenser by adopting a steel frame structure;
symmetrically installing steel frames at the edge positions of two sides of the trough type solar heat collector, arranging metal rings at the upper ends of the steel frames and having the same axle center with the vacuum heat collecting tube, and symmetrically installing illumination radiation intensity measuring modules on the steel frames; the device comprises an illumination radiation intensity measuring module, a vacuum heat collecting pipe, a glass pipe, a high-temperature resistant plastic pipe and a small fan, wherein the illumination radiation intensity measuring module consists of narrow photovoltaic cell strips, a metal pipe, the high-temperature resistant plastic pipe and the small fan, the axis of the illumination radiation intensity measuring module is coaxial with the vacuum heat collecting pipe, the high-temperature resistant plastic pipe is arranged in the glass pipe, the outer surface of the high-temperature resistant plastic pipe is coated with an insulating layer, and N narrow photovoltaic cell strips are uniformly attached to the; and the output of each narrow photovoltaic cell strip is connected with a digital display device.
2. The device for measuring the surface radiation intensity of the metal tube in the trough-type solar heat collection tube according to claim 1, wherein a small fan is installed at the end of the high-temperature resistant plastic tube.
3. The device for measuring the surface radiation intensity of the metal tube in the trough-type solar heat collection tube according to claim 1, wherein a refrigeration fan is coaxially installed at the edge of the tail end of the illumination radiation intensity measuring module, and the refrigeration fan is driven by a driving motor.
4. The device for measuring the radiation intensity on the surface of the metal tube in the trough-type solar heat collection tube according to claim 1, wherein the N narrow photovoltaic cell strips installed in the illumination radiation intensity measuring module have the same physical and chemical characteristics, and the size of N depends on the requirement of measuring accuracy.
5. The method for measuring the surface radiation intensity of the metal tube in the trough-type solar heat collection tube according to any one of claims 1 to 4, comprising the following steps:
(1) the groove type solar heat collector focuses solar rays onto the surface of the vacuum heat collecting pipe by using the groove type condenser, and edge rays can be generated at the edge of the groove type condenser in the process of rising and falling of the sun;
(2) the edge light rays enter the illumination radiation intensity measuring module after being reflected, firstly penetrate through the glass tube, then irradiate the glass tube on N narrow photovoltaic cell strips on the outer surface of the plastic tube, and generate potential difference on each narrow photovoltaic cell strip, namely the narrow photovoltaic cell strips convert the solar radiation energy of the edge light rays into electric signals and display the electric signals through the digital display device;
(3) the illumination radiation intensity of different positions on the surface of the metal tube in the vacuum heat collecting tube is obtained by comparing the electric signals of the narrow photovoltaic cell strips at different positions on the circumference of the plastic tube;
(4) meanwhile, the electric quantity generated by the narrow photovoltaic cell strip in the illumination radiation intensity measuring module drives the refrigerating fan at the edge of the tail end of the illumination radiation intensity measuring module to rotate so as to refrigerate the illumination radiation intensity measuring module;
(5) the wind generated by the refrigerating fan drives the small fan at the tail end of the plastic pipe of the illumination radiation intensity measuring module to coaxially rotate, so that the narrow photovoltaic battery strip group is driven to slowly rotate.
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CN201510438333.7A CN105066484B (en) | 2015-07-23 | 2015-07-23 | Metal tube surface radiant intensity measurement device and method in groove type solar thermal-collecting tube |
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CN201510438333.7A CN105066484B (en) | 2015-07-23 | 2015-07-23 | Metal tube surface radiant intensity measurement device and method in groove type solar thermal-collecting tube |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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CN106016793A (en) * | 2016-07-08 | 2016-10-12 | 张正文 | Trough type solar support based on principle of gravity and mounting method of support |
CN106091425A (en) * | 2016-08-11 | 2016-11-09 | 南京索乐优节能科技有限公司 | Asymmetric groove type solar heat collector in conjunction with glass sunlight house |
CN107588970A (en) * | 2017-09-05 | 2018-01-16 | 河海大学常州校区 | A kind of Multifunctional reflective face ecad groove type heat collector testboard and adjustment method |
CN110108050A (en) * | 2019-06-06 | 2019-08-09 | 中国能源建设集团陕西省电力设计院有限公司 | Paraboloid thermal-arrest light spot energy and Heat flux calculation system and method |
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CN106016793A (en) * | 2016-07-08 | 2016-10-12 | 张正文 | Trough type solar support based on principle of gravity and mounting method of support |
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