CN114923288A - Temperature-controlled solar heat pipe and production method thereof - Google Patents
Temperature-controlled solar heat pipe and production method thereof Download PDFInfo
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- CN114923288A CN114923288A CN202210185725.7A CN202210185725A CN114923288A CN 114923288 A CN114923288 A CN 114923288A CN 202210185725 A CN202210185725 A CN 202210185725A CN 114923288 A CN114923288 A CN 114923288A
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- heat pipe
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S10/00—Solar heat collectors using working fluids
- F24S10/70—Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits
- F24S10/75—Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits with enlarged surfaces, e.g. with protrusions or corrugations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S10/00—Solar heat collectors using working fluids
- F24S10/90—Solar heat collectors using working fluids using internal thermosiphonic circulation
- F24S10/95—Solar heat collectors using working fluids using internal thermosiphonic circulation having evaporator sections and condenser sections, e.g. heat pipes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S70/00—Details of absorbing elements
- F24S70/10—Details of absorbing elements characterised by the absorbing material
- F24S70/12—Details of absorbing elements characterised by the absorbing material made of metallic material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S10/00—Solar heat collectors using working fluids
- F24S10/70—Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits
- F24S10/75—Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits with enlarged surfaces, e.g. with protrusions or corrugations
- F24S2010/751—Special fins
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Thermal Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Dispersion Chemistry (AREA)
- Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
Abstract
The invention provides a temperature-control solar heat pipe and a production method thereof, wherein the temperature-control solar heat pipe comprises a condensing head and a heat pipe section, working media are injected in the heat pipe, aluminum alloys with different yield strengths are selected for the condensing head and the heat pipe section according to different working temperatures of the working media in the condensing head and the heat pipe section, and toothed fins are processed on the inner wall of the condensing head in order to improve the heat exchange effect; and (4) selecting proper working media by combining the use working conditions of the heat pipe, and determining the filling amount according to the failure temperature of the heat pipe. The invention has the beneficial effects that: the heat pipe has the advantages that the production cost of the heat pipe is reduced, the weight of the heat pipe is reduced, the heat exchange efficiency is high, working media are selected according to the using working conditions of the heat pipe, and the charging amount of the working media is accurately calculated to achieve accurate temperature control of the heat pipe.
Description
Technical Field
The invention relates to the technical field of solar photo-thermal utilization, in particular to a temperature-control solar heat pipe and a production method thereof.
Background
The utilization of renewable energy is a major measure for mankind to cope with the energy crisis. Solar energy is widely used as a renewable clean energy source in the field of water heaters. Solar heat collectors commonly used in the market mainly comprise flat plate heat collectors, full-glass vacuum tube heat collectors, U-shaped tube heat collectors and heat pipe heat collectors. Compared with other heat collectors, the solar heat pipe heat collector has attracted much attention because of its high heat efficiency, strong frost resistance, rapid temperature rise, low heat loss, and the like.
The existing gravity heat pipe used in the solar heat pipe collector is mostly made of copper, and the working medium of the heat pipe is water. When the solar radiation intensity is high in summer, the excessive heat in the heat collection system can cause high temperature problems such as pressure relief of a safety valve, high-temperature aging of equipment, heat transfer capacity loss caused by carbonization of an antifreeze and the like. The high processing cost and the complex temperature control mode of the solar heat pipe collector become main obstacles for popularizing the heat pipe collector in China.
Patent CN105865239A discloses an automatic temperature-sensing blocking type overheating-prevention heat pipe, in which an automatic blocking device is disposed at a position close to an evaporation section in a condensation section of the heat pipe, so as to solve the problem of system overheating of a solar water heater system under the condition of high air temperature. Although the temperature can be effectively controlled, the internal structure of the heat pipe is complex and the processing is difficult. Patent CN112880209A discloses a solar air-charging control hot-pipe device, in which an air storage chamber is arranged at the top of the inner cavity of the hot pipe, non-condensable gas is filled in the air storage chamber, the air storage chamber divides the condenser pipe into two parts, and the change of the gas volume in the air storage chamber is pushed by the change of the water vapor pressure in the hot pipe to realize the improvement of the temperature control of the hot pipe. However, the working medium in the heat pipe is water and has a complex structure.
Therefore, it is necessary to provide a solar heat pipe and a method for manufacturing the same, which has a simple structure, high heat exchange efficiency, temperature control capability, and a long service life.
Disclosure of Invention
In order to solve the technical problems, the invention discloses a temperature-control solar heat pipe which has a simple structure and can realize accurate temperature control and a production method thereof, and the technical scheme of the invention is implemented as follows:
a temperature-control solar heat pipe comprises a condensation head and a heat pipe section, wherein the condensation head is connected with the heat pipe section, the condensation head and the heat pipe section are made of aluminum alloys with different yield strengths, the condensation head comprises a head sealing section, a condensation section and a connecting section, the connecting section is connected with the heat pipe section, the condensation section is connected with the head sealing section and the connecting section, and a toothed fin is machined on the inner wall of the condensation section; working media are injected into the condensation head and the heat pipe section, and the critical temperature of the working media is 100-200 ℃.
Preferably, the material of the condensation head comprises 6063 aluminum alloy.
Preferably, the material of the heat pipe section comprises 5 series aluminum alloy, 7 series aluminum alloy or aluminum-rhenium alloy.
Preferably, the inner wall shape of the heat pipe section comprises a light pipe, a threaded pipe and a finned pipe.
A production method of a temperature-control solar heat pipe comprises the following steps according to any one of the temperature-control solar heat pipes: s1: the aluminum alloy section is subjected to common extrusion and then is subjected to spinning by an automatic lathe to form the condensation head with the toothed fin; s2: the selected aluminum alloy section is punched and extruded to form the heat pipe section; s3: welding the heat pipe section and the condensation head through a high-frequency welding machine; s4: vacuumizing by using a vacuumizing unit; s5: filling working media by using a filling machine set; s6: after filling, reducing the pipe by using a hydraulic pipe reducing machine; s7: sealing and welding the heat pipe section; wherein, the working medium charging amount in the step S5 is the charging amount corresponding to the set heat pipe failure temperature T.
Preferably, in the S4, the degree of vacuum is measured<10 -3 And when Pa, finishing vacuumizing.
Preferably, the filling precision of the working medium in the S5 is +/-0.1 g.
Preferably, in S7, the heat pipe section is sealed by argon arc welding, spot welding, ultrasonic welding or brazing.
The technical scheme of the invention can solve the technical problems of more complex structure and higher production cost of the temperature control heat pipe in the prior art; according to the technical scheme, the design of the condensation head and the heat pipe section is adopted, the aluminum alloys with different yield strengths are adopted according to the working temperatures of different areas, the proper working medium is selected and injected into the heat pipe according to the working conditions, meanwhile, the charging amount of the working medium is calculated to ensure the accurate charging of the working medium, and the achievable technical effects comprise that:
1. the cost is effectively reduced, and the weight of the heat pipe is greatly reduced;
2. the heat transfer efficiency of the heat pipe is greatly improved;
3. the temperature control effect is good and the structure is simple;
4. the service life of the heat pipe is greatly prolonged and is more than 15 years.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, it is obvious that the drawings in the following description are only one embodiment of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
In which like parts are designated by like reference numerals. It should be noted that as used in the following description, the terms "front", "back", "left", "right", "upper" and "lower" refer to directions in the drawings, and the terms "bottom" and "top", "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
FIG. 1 is a schematic view of a temperature controlled solar thermal tube configuration;
FIG. 2 is a schematic structural diagram of a condensing head;
FIG. 3 is a front cross-sectional view of a condensing head;
fig. 4 is a right sectional view of the condensing head.
In the above drawings, the reference numerals denote:
1 condensation head
1-1 seal segment
1-2 condensation section
1-3 connection segment
1-4 tooth-shaped fin
2 heat pipe section
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.
Example 1
In a preferred embodiment 1, as shown in fig. 1, a temperature-controlled solar heat pipe comprises a condensation head 1 and a heat pipe section 2, wherein the condensation head 1 is connected with the heat pipe section 2, and the condensation head 1 and the heat pipe section 2 are made of aluminum alloys with different yield strengths, which are lighter in weight and effectively reduce the production cost of the heat pipe compared with the existing common copper. The solar heat pipe is filled with working medium, the working medium is evaporated after absorbing solar radiation heat, the gaseous working medium rises to the condensation head 1 along the heat pipe section 2 under the action of buoyancy, the working medium in the condensation head 1 is liquefied after being cooled outside, and the liquid working medium returns to the heat pipe section 2 under the action of gravity to form a closed two-phase flow loop. Consequently, there is different operating temperature in condensation head 1 and heat pipe section 2, in order to guarantee the life of heat pipe, to the aluminum alloy of the different yield strength of condensation head 1 and heat pipe section 2 adoption, the working medium temperature in the condensation head 1 is lower, can choose 6063 aluminum alloy for use as the section bar, and the working medium temperature in the heat pipe section 2 is higher, should select the higher material of yield strength: 5-series aluminum alloys such as 5083, 5A 02; 7-series aluminum alloys such as 7075, 7A04 or aluminum rhenium alloys. The condensation head 1 comprises a head sealing section 1-1, a condensation section 1-2 and a connecting section 1-3, as shown in figures 2 and 3, the connecting section 1-3 is connected with the heat pipe section 2, the condensation section 1-2 is connected with the head sealing section 1-1 and the connecting section 1-3, the inner wall of the condensation section 1-2 is processed with a toothed fin 1-4, as shown in figure 4, the toothed fin 1-4 is used for increasing the condensation heat exchange area of the working medium and improving the condensation heat exchange effect. The heat pipe also comprises a working medium, the working medium is evaporated after absorbing the heat of solar radiation, the gaseous working medium rises to the condensation head 1 along the heat pipe section 2 under the action of buoyancy, the working medium in the condensation head 1 is liquefied after being cooled by the outside, and the liquid working medium returns to the heat pipe section 2 under the action of gravity. The working medium should be selected from media with large phase change latent heat, small kinematic viscosity, high heat conductivity coefficient, large liquid phase density and supercritical temperature of 100-200 ℃, such as heptafluoropropane, ethyl fluoride, trifluoromethyl methyl ether, methyl chloride and the like. The inner wall of the heat pipe section 2 can adopt a light pipe, a threaded pipe or a finned pipe.
Example 2
In a preferred embodiment 2, a method for producing a temperature-controlled solar heat pipe, the method for producing a temperature-controlled solar heat pipe in embodiment 1 comprises the following steps: s1: after the aluminum alloy section is subjected to common extrusion, a pipe section part of the condensation head 1 with the toothed fins 1-4 is formed, the head sealing section 1-1 and the connecting section 1-3 are formed by spinning through an automatic lathe, the temperature of a working medium in the condensation head 1 is low, and 6063 aluminum alloy can be selected as the aluminum alloy material; s2: the working medium in the heat pipe section 2 has higher temperature, and the section bar can be made of 5 series aluminum alloy such as 5083 and 5A 02; 7 series aluminum alloy such as 7075, 7A04 or aluminum rhenium alloy, and selected section bar is punched and extruded to form a hot pipe section 2; s3: inserting the heat pipe section 2 into the connecting section 1-3 of the condensing head 1 and then welding by a high-frequency welding machine; s4: vacuumizing by using a vacuumizing unit, wherein the vacuum degree is less than 10 -3 When Pa, finishing vacuumizing; s5: the method comprises the following steps of filling working media by using a filling unit, selecting the working media according to the used working conditions, selecting media with large phase change latent heat, small kinematic viscosity, high heat conductivity coefficient, large liquid phase density and supercritical temperature of 100-200 ℃ by the working media, such as heptafluoropropane, ethyl fluoride, trifluoromethyl methyl ether, methyl chloride and the like, and calculating the filling amount of the working media to ensure accurate temperature control of a heat pipe, wherein the calculation method of the filling amount of the working media comprises the following steps: setting a failure temperature of the heat pipe, for example, setting the heat pipe to be failed at 85 ℃, instantly reducing the liquid working medium at 85 ℃, stopping heat transfer when the heat pipe reaches a dry limit, and calculating the charge of the working medium according to the working condition at 85 ℃ because the working medium in the heat pipe is gaseous at the moment. The filling precision of the working medium is +/-0.1 g; s6: after filling, reducing the pipe by using a hydraulic pipe reducing machine; s7: argon arc welding and spot welding are adoptedAnd sealing and welding the heat pipe section 2 by ultrasonic welding or brazing.
It should be understood that the above-described embodiments are merely exemplary of the present invention, and are not intended to limit the present invention, and that any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (8)
1. A temperature-control solar heat pipe is characterized in that: the heat pipe comprises a condensation head and a heat pipe section, wherein the condensation head is connected with the heat pipe section, the condensation head and the heat pipe section are made of aluminum alloys with different yield strengths, the condensation head comprises a head sealing section, a condensation section and a connecting section, the connecting section is connected with the heat pipe section, the condensation section is connected with the head sealing section and the connecting section, and the inner wall of the condensation section is provided with a toothed fin; working media are injected into the condensation head and the heat pipe section, and the critical temperature of the working media is 100-200 ℃.
2. The temperature-controlled solar thermal pipe according to claim 1, wherein: the material of the condensation head comprises 6063 aluminum alloy.
3. The temperature-controlled solar thermal pipe according to claim 2, wherein: the heat pipe section is made of 5 series aluminum alloy, 7 series aluminum alloy or aluminum-rhenium alloy.
4. A temperature controlled solar thermal pipe according to claim 3, wherein: the inner wall shape of the heat pipe section comprises a light pipe, a threaded pipe or a finned pipe.
5. A production method of a temperature-controlled solar heat pipe according to any one of claims 1 to 4, which is characterized by comprising the following steps: s1: the aluminum alloy section is subjected to common extrusion and then is subjected to spinning by an automatic lathe to form the condensation head with the toothed fin on the inner wall; s2: the selected aluminum alloy section is punched and extruded to form the heat pipe section; s3: welding the heat pipe section and the condensation head through a high-frequency welding machine; s4: vacuumizing by using a vacuumizing unit; s5: filling working media by using a filling machine set; s6: after filling, reducing the pipe by using a hydraulic pipe reducing machine; s7: sealing and welding the heat pipe section; wherein, the working medium charging amount in the step S5 is the charging amount corresponding to the set temperature T at which the heat pipe fails.
6. A temperature controlled solar thermal pipe and method of manufacture according to claim 5, wherein: in the S4, the degree of vacuum<10 -3 And when Pa is needed, vacuumizing is completed.
7. The temperature-controlled solar heat pipe and the production method thereof according to claim 5, wherein: and the filling precision of the working medium in the S5 is +/-0.1 g.
8. The temperature-controlled solar heat pipe and the production method thereof according to claim 5, wherein: sealing and welding the heat pipe section in the step S7 by adopting argon arc welding, spot welding, ultrasonic welding or brazing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210185725.7A CN114923288A (en) | 2022-02-28 | 2022-02-28 | Temperature-controlled solar heat pipe and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210185725.7A CN114923288A (en) | 2022-02-28 | 2022-02-28 | Temperature-controlled solar heat pipe and production method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114923288A true CN114923288A (en) | 2022-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210185725.7A Pending CN114923288A (en) | 2022-02-28 | 2022-02-28 | Temperature-controlled solar heat pipe and production method thereof |
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| CN (1) | CN114923288A (en) |
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- 2022-02-28 CN CN202210185725.7A patent/CN114923288A/en active Pending
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