CN109506375B - Slot type solar heat collector - Google Patents
Slot type solar heat collector Download PDFInfo
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- CN109506375B CN109506375B CN201811421183.9A CN201811421183A CN109506375B CN 109506375 B CN109506375 B CN 109506375B CN 201811421183 A CN201811421183 A CN 201811421183A CN 109506375 B CN109506375 B CN 109506375B
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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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Abstract
The invention provides a trough type solar heat collector which comprises a reflector and a heat collecting pipe, wherein the heat collecting pipe is positioned at the focus position of the reflector, the reflector reflects solar energy to the heat collecting pipe for heating water in the heat collecting pipe, the heat collecting pipe is internally provided with a plurality of heat pipes which extend upwards from the bottom of the heat collecting pipe, and the bottoms of the lower ends of the heat pipes are connected to the inner wall of the heat collecting pipe. The invention provides a solar heat collecting tube with a novel heat tube structure, wherein the heat tube is arranged at the bottom of the heat collecting tube, and the heat transmission speed of solar energy is improved by the characteristic of high heat transmission speed of the heat tube, so that the heat absorption capacity can be further met.
Description
Technical Field
The invention relates to a heat collecting tube technology, in particular to a heat collecting tube of a heat tube with a novel structure.
Background
The heat pipe technology was Ross Alamos (Los Alamos) in 1963National laboratoryGeorge Grover, a heat transfer called "heat pipe" of the inventionComponentThe heat conduction principle and the quick heat transfer property of the phase change medium are fully utilized, the heat of a heating object is quickly transferred to the outside of a heat source through the heat pipe, and the heat conduction capability of the heat pipe exceeds the heat conduction capability of any known metal.
The heat pipe technology is widely applied to the industries of aerospace, military industry and the like, and since the heat pipe technology is introduced into the radiator manufacturing industry, the design idea of the traditional radiator is changed for people, the single heat radiation mode that a high-air-volume motor is used for obtaining a better heat radiation effect is avoided, the heat pipe technology is adopted for enabling the radiator to obtain a satisfactory heat exchange effect, and a new place in the heat radiation industry is opened up. At present, heat pipes are widely applied to various heat exchange devices, including the field of electric power, such as waste heat utilization of power plants.
The heat collecting pipe is a mechanical device which heats water into steam by using the heat energy of fuel or other energy sources. The heat collecting pipe has wide application field, is widely suitable for clothing factories, dry cleaning shops, restaurants and bunkers,dining room，Dining roomThe method comprises the following steps of, factory and mine,bean productFactories, etc. The current heat collecting tube is also widely applied to the treatment of various diseases, especially to the treatment of chronic diseases caused by aging and old damage of muscles, ligaments and the like, such as the CN2167709Y patent, but the current prior art, such as the CN2167709Y patentBecause the steam is generated directly through heating, the temperature of the generated steam is too high, the moisture in the generated steam is too high, the medicine is possibly deposited at the lower part because of particles, the content of effective components in the sprayed steam is too low, the temperature is too high, the intelligent degree in the prior art is not high, and the effective intelligent operation cannot be carried out.
In the background art, when the solar energy is used for heating the heat collecting tube, the solar energy or the direct heating heat collecting tube or the steam is generated through secondary heat exchange, particularly the direct heating heat collecting tube, the convection heat exchange of the fluid at the upper part and the lower part of the heat collecting tube is carried out by utilizing the convection heat exchange in the heat collecting tube, but the lower part hot fluid is required to naturally convect to the upper part under the condition, and the heat exchange efficiency is low.
Aiming at the problems, the invention is improved on the basis of the prior invention, and provides a solar heat collecting pipe with a new structure, which makes full use of a heat source and reduces energy consumption.
Disclosure of Invention
Aiming at the problems, the invention is improved on the basis of the prior invention, and provides a novel heat collecting pipe with a heat pipe structure so as to realize the full utilization of solar energy.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the utility model provides a slot type solar collector, includes speculum and heat collecting pipe, the heat collecting pipe is located the focus position of speculum, the speculum is used for heating the water in the heat collecting pipe for the heat collecting pipe with solar energy reflection, and the heat collecting pipe inside sets up the heat pipe that begins upwards to extend from the heat collecting pipe bottom, the heat pipe is many, the bottom of the lower extreme of heat pipe is connected on the inner wall of heat collecting pipe.
Preferably, the bottom of the lower end of the heat pipe is the inner wall of the heat collecting pipe.
Preferably, a communication pipe is provided between at least two adjacent heat pipes.
Preferably, the center of the heat collecting tube is located at the focal position of the reflector.
Preferably, the bottom of the heat collecting pipe is provided with a header, and the lower part of the heat pipe is communicated with the header.
Preferably, the lower wall surface of the header is a surface of the bottom of the heat collecting pipe.
The external diameter of the heat pipe is d, the distance between the circle centers of the adjacent heat pipes in the same row is S, the circle center of each heat pipe and the circle centers of the adjacent two heat pipes in the adjacent row form an isosceles triangle, and the vertex angle of the isosceles triangle is A, so that the following requirements are met:
Sin(A)＝a*(d/S)3-b*(d/S)2+ c (d/S) + e, where a, b, c, e are parameters, satisfying the following requirements:
8.20<a<8.22,6.19<b<6.21；0.062<c<0.063,0.83<e<0.84,0.12<d/S<0.55。
preferably, a is 8.21, b is 6.20, c is 0.0625, and d is 0.835;
preferably, the heat collecting pipes are multiple, and the multiple heat collecting pipes are in parallel connection.
Preferably, the heat collecting pipes are multiple, and the multiple heat collecting pipes are of a series-parallel mixed structure.
Compared with the prior art, the invention has the following advantages:
1) the solar heat collecting tube is improved, and the heat tube is arranged at the bottom of the heat collecting tube, so that solar energy is quickly transmitted to the upper part of the heat collecting tube through the characteristic of high heat transmission speed of the heat tube, the heat transmission speed of the solar energy is improved, and the heat absorption capacity can be further met.
2) The communicating pipe is arranged between the adjacent heat pipes, so that uneven heating between the heat pipes can be avoided, pressure balance between the heat pipes is realized, and the defect caused by uneven heating between different heat pipes is avoided.
3) The invention can ensure that the pressure is balanced as soon as possible in the flowing process of the fluid through the distribution quantity of the communicating pipes and the change rule of the pipe diameters.
4) A large amount of numerical simulation and experimental research are carried out on the distribution rule of the heat pipes, and the optimal relational expression of the heat pipe distribution is summarized on the basis of the research.
Drawings
FIG. 1 is a schematic view of a solar energy system of the present invention.
Fig. 2 is a schematic view of the solar heat collecting tube according to the present invention.
FIG. 3 is a schematic view of the heat collecting tube of the present invention with a communicating tube.
FIG. 4 is a schematic diagram of a horizontal projection structure of a heat pipe according to the present invention.
FIG. 5 is a schematic view of a heat collecting pipe parallel connection structure of the present invention.
FIG. 6 is a schematic diagram of a control structure according to the present invention.
Fig. 7 is a dimension identification diagram of fig. 4.
In the figure: 1-reflector, 2-heat collecting pipe, 3-heat pipe, 4-heat utilizing device, 5-heat collector, 6-communicating pipe, 7-central controller, 8-water outlet pipe, 10-inlet pipe, 11-radiator inlet pipe, 12-heat collector return pipe, 13-temperature sensor, 14-valve, 15-valve, 16-valve, 17-temperature sensor, 41-heat accumulator, 42-radiator
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
In this document, "/" denotes division and "×", "denotes multiplication, referring to formulas, if not specifically stated.
Fig. 1 discloses a solar energy system comprising a solar collector 5, which absorbs solar energy, heats a fluid flowing therethrough, and then the fluid enters a heat utilization device for utilization, and a heat utilization device 4.
As disclosed in fig. 2-5, the trough-type solar collector 5 using heat pipes, the collector 5 includes a reflector 1 and a heat collecting pipe 2, the heat collecting pipe 2 is located at a focal position of the reflector 1, the reflector 1 reflects solar energy to the heat collecting pipe 2 for heating water in the heat collecting pipe 2, the heat collecting pipe further includes a heat pipe 3 disposed in the heat collecting pipe 2, as shown in fig. 2, the heat pipe 3 is disposed inside the heat collecting pipe 2 and extends upward from the bottom of the heat collecting pipe 2, the heat pipes 3 are multiple, and the bottom of the lower end of the heat pipe is connected to the inner wall of the heat collecting pipe.
The traditional solar heat collecting pipe directly irradiates the heat collecting pipe through sunlight to generate steam, and the convection heat exchange inside the heat collecting pipe is utilized to carry out fluid convection heat exchange on the upper part and the lower part of the heat collecting pipe, but in the case, the lower part of hot fluid is required to naturally convect to the upper part, so that the heat exchange efficiency is low.
Preferably, the bottom of the lower end of the heat pipe 3 is the inner wall of the heat collecting pipe 2. Thus, the heat pipe and the heat collecting pipe can be taken as a whole, the inner wall of the heat collecting pipe is taken as the lower end wall surface of the heat pipe, the contact thermal resistance is reduced, the integral structure is compact,
Preferably, the heat collecting tube and the heat pipe are integrally manufactured.
Preferably, the communication pipe 6 is provided between at least two adjacent heat pipes 3. For example, as shown in fig. 3, a communication pipe 6 is provided between two heat pipes 3 adjacent to each other. Of course, FIG. 3 is merely a schematic illustration and, while only two heat pipes are shown, it is not intended to indicate only two heat pipes. By arranging the communicating pipe 6, uneven heating between the heat pipes 3 can be avoided, pressure balance between the heat pipes is realized, and the defect caused by uneven heating between different heat pipes is avoided.
Preferably, the distance between adjacent communication pipes 6 increases from the lower portion of heat pipe 3 to the upper portion of heat pipe 3. Because the heat pipe absorbs solar energy at the bottom and then releases heat in the heat collecting pipe. The fluid continuously releases heat along with the upward flow of the vertical part of the fluid of the heat pipe, and the pressure in different heat pipes is gradually reduced along with the continuous heat release of the fluid, so that the pressure balance can be ensured to be achieved as soon as possible in the flowing process of the fluid, the number of communicating pipes is saved, and materials are saved.
Preferably, the distance between adjacent communication pipes 6 increases from the lower portion of heat pipe 3 to the upper portion of heat pipe 3 to a larger extent. Experiments show that the arrangement can ensure that the pressure balance is achieved more optimally and more quickly in the fluid flowing process. This is also the best way of communicating by extensively studying the law of change of the pressure distribution.
Preferably, the diameter of communication pipe 6 is reduced from the lower portion of heat pipe 3 to the upper portion of heat pipe 3. The purpose is to ensure a larger communication area, because the fluid continuously releases heat along with the upward flow of the fluid, and the pressure in different heat pipes is smaller and smaller along with the continuous heat release of the fluid, so that the pressure balance can be ensured to be achieved as soon as possible in the flowing process of the fluid through the arrangement.
Preferably, the diameter of communication pipe 6 decreases from the lower portion of heat pipe 3 to the upper portion of heat pipe 3 to a larger extent. Experiments show that the arrangement can ensure that the pressure balance is achieved more optimally and more quickly in the fluid flowing process. This is also the best way of communicating by extensively studying the law of change of the pressure distribution.
Preferably, the center of the heat collecting tube is located at the focal position of the reflector. The center of the heat collecting tube is positioned at the focal position of the reflector, so that the heat collecting tube can be uniformly heated in all directions.
Preferably, the liquid medicine flows through the heat collecting pipe. The heat collecting pipe is a heat collecting pipe with a liquid medicine heating function.
Preferably, the heat collecting pipes 2 are multiple, and the multiple heat collecting pipes are in a series structure.
Preferably, as shown in fig. 5, the plurality of heat collecting pipes are in a series-parallel mixed structure.
The heat pipes are multiple, and the distribution density of the heat pipes is smaller and smaller along the central line of the bottom of the heat collecting pipe towards the two sides. In numerical simulation and experiments, the heat pipes are heated less and less along the radial direction from the center of the bottom of the heat collecting pipe to the outside, and the temperatures of the heat pipes at different positions are different, so that local heating is not uniform. Because the closer to the center, the more the focused solar energy is, the larger the heat receiving amount is, and the heat exchange capacity is also increased, therefore, the density of the heat pipes arranged at different positions of the bottom of the heat collecting pipe is different, so that the temperature of the whole heat pipe is kept basically the same, the whole heat exchange efficiency is improved, the material is saved, the local damage caused by uneven temperature is avoided, and the service life of the heat pipe is prolonged.
Preferably, the distribution density of the heat pipes is continuously increased in a smaller and smaller range along the radial direction from the center of the bottom of the heat collecting pipe to the outside. As the change of the distribution density of the heat pipe, the invention carries out a large number of numerical simulations and experiments, thereby obtaining the change rule of the distribution density of the heat pipe. Through the change rule, materials can be saved, and meanwhile, the heat exchange efficiency can be improved by about 9%.
Preferably, the diameter and length of each heat pipe 3 are the same.
Preferably, the heat pipes 3 are multiple, and the pipe diameters of the heat pipes are smaller and smaller along the central line of the bottom of the heat collecting pipe towards the two sides. The specific reason is the same as the reason of the distribution density of the heat pipes in the foregoing.
Preferably, the pipe diameter of the heat pipe is gradually increased in a smaller and smaller range along the central line of the bottom of the heat collecting pipe towards the two sides. The specific reason is the same as the reason of the distribution density of the heat pipes in the foregoing.
Preferably, the distribution density and the length of all the heat pipes 3 are the same.
The heat pipes 3 are multiple, and the distribution density of the heat pipes is increased along the flowing direction of fluid in the heat collecting pipes. In numerical simulation and experiments, the temperature of the fluid is higher and higher along the flowing direction of the fluid, so that the heat absorption capacity of the fluid is gradually reduced, the heat dissipation capacity of the heat pipe is gradually reduced, and the temperature of the heat pipe at different positions is different, thereby causing local uneven heating. The density of the heat pipes is different at different positions of the heat collecting pipe, so that the heat release capacity of the heat pipes is continuously reduced along the flowing direction of the fluid, and the heat is dispersed by distributing more heat pipes, so that the temperature of the whole heat pipes is kept basically the same, the whole heat exchange efficiency is improved, materials are saved, local damage caused by uneven temperature is avoided, and the service life of the heat pipes is prolonged.
Preferably, along the flowing direction of the fluid in the heat collecting pipe, the distribution density of the heat pipe is continuously increased with a larger and larger amplitude. As the change of the distribution density of the heat pipe, the invention carries out a large number of numerical simulations and experiments, thereby obtaining the change rule of the distribution density of the heat pipe. Through the change rule, materials can be saved, and meanwhile, the heat exchange efficiency can be improved by about 9%.
Preferably, the diameter and length of each heat pipe 3 are the same.
Preferably, the length of the heat collecting pipe is C, and the density of the heat pipe at the most front end along the flow direction of the heat collecting pipe fluid is MTailThen, the density M of the heat pipe at a distance of l from the foremost end of the heat pipe is as follows: m ═ b ═ MTail+c*MTail*(l/C)aWherein a, b and c are coefficients, and the following requirements are met:
1.075<a<1.119,0.94<b+c<0.99，0.465<b<0.548。
preferably, a gradually decreases as l/C increases.
Preferably, 1.09< a <1.11, b + c ═ 0.99, 0.503< b < 0.508;
the optimized formula is obtained through a large number of experiments and numerical simulation, the distribution density of the heat pipes can achieve optimized distribution, the heat distribution can be uniform on the whole, the heat exchange effect is good, and meanwhile materials can be saved.
Preferably, the number of the heat pipes is multiple, and the pipe diameter of each heat pipe is larger and larger along the flowing direction of the fluid in the heat collecting pipe.
Preferably, the pipe diameter of the heat pipe is continuously increased in a smaller and smaller range along the flowing direction of the fluid in the heat collecting pipe. See the heat pipe density variations for specific reasons.
Preferably, the distribution density and length of all heat pipes are the same.
Along the flowing direction of the flue gas, the length of the heat collecting pipe is C, and along the flowing direction of the flue gas, the pipe diameter of the heat pipe at the foremost end of the heat collecting pipe is DTailThen, the rule of the pipe diameter D of the heat pipe at the position l away from the tail of the heat pipe is as follows:
D2＝b*(Dtail)2+c*(DTail)2*(l/C)aWherein a, b and c are coefficients, and the following requirements are met:
1.085<a<1.125,0.985<b+c<1.015，0.485<b<0.645。
preferably, a gradually decreases as l/C increases.
Preferably, 1.093< a <1.106, b + c ═ 1, 0.548< b < 0.573;
the optimized formula is obtained through a large number of experiments and numerical simulation, the distribution density of the heat pipes can achieve optimized distribution, the heat distribution can be uniform on the whole, the heat exchange effect is good, and meanwhile materials can be saved.
Preferably, the heat pipes 3 are multiple, and the distribution density of the communicating pipes is increased along the flowing direction of the fluid in the heat collecting pipe. In numerical simulation and experiments, the temperature of the fluid is higher and higher along the flowing direction of the fluid, so that the heat absorption capacity of the fluid is gradually reduced, the heat dissipation capacity of the heat pipe is gradually reduced, and the temperature of the heat pipe at different positions is different, thereby causing local uneven heating. The density of the communicating pipes is different at different positions of the heat collecting pipe, so that the heat release capacity of the heat pipe is continuously reduced along the fluid flowing direction, and the pressure is dispersed by distributing more communicating pipes, so that the temperature of the whole heat pipe is kept basically the same, the whole heat exchange efficiency is improved, materials are saved, local damage caused by uneven temperature is avoided, and the service life of the heat pipe is prolonged.
Preferably, along the flowing direction of the fluid in the heat collecting tube, the distribution density of the communicating tube is continuously increased in a larger and larger range. As the change of the distribution density of the communicating pipe, the invention carries out a large number of numerical simulations and experiments, thereby obtaining the change rule of the distribution density of the heat pipe. Through the change rule, materials can be saved, and meanwhile, the heat exchange efficiency can be improved by about 9%.
Preferably, the diameter and the length of each communication pipe are the same.
Preferably, the heat pipes 3 are multiple, and the diameter of the communicating pipe is larger and larger along the flowing direction of the fluid in the heat collecting pipe. In numerical simulation and experiments, the temperature of the fluid is higher and higher along the flowing direction of the fluid, so that the heat absorption capacity of the fluid is gradually reduced, the heat dissipation capacity of the heat pipe is gradually reduced, and the temperature of the heat pipe at different positions is different, thereby causing local uneven heating. The heat collecting pipe has the advantages that the diameters of the communicating pipes are different at different positions of the heat collecting pipe, so that the heat releasing capacity of the heat pipe is continuously reduced along the flowing direction of fluid, and the heat is dispersed by distributing more communicating pipes, so that the temperature of the whole heat pipe is kept basically the same, the whole heat exchange efficiency is improved, materials are saved, local damage caused by uneven temperature is avoided, and the service life of the heat pipe is prolonged.
Preferably, the diameter of the communicating pipe is increased along the flowing direction of the fluid in the heat collecting pipe. As the change of the diameter of the communicating pipe, the invention carries out a large number of numerical simulations and experiments, thereby obtaining the change rule of the distribution density of the heat pipe. Through the change rule, materials can be saved, and meanwhile, the heat exchange efficiency can be improved by about 9%.
Preferably, the distribution density of the communication pipes is the same as the length of each communication pipe.
Preferably, as shown in fig. 4, the heat pipes are arranged in a plurality of rows, viewed from the top downwards, or in horizontal projection, wherein two adjacent rows are arranged in a staggered manner; the circle centers of the heat pipes and the circle centers of the two adjacent heat pipes in the adjacent row form an isosceles triangle, and the circle centers of the heat pipes are located at the points of the vertex angles of the isosceles triangle.
Through numerical simulation and experiment, it is found that the distance between the heat pipes 3, including the distance between the same row and the distance between the adjacent rows can not be too small, the undersize can lead to the heat pipe to distribute too much, lead to the heat absorption capacity of every heat pipe not enough, too big can lead to the heat pipe to distribute too little, lead to the heat pipe overheated, consequently this application summarizes out the distribution of the optimization that the heat pipe 3 distributes through a large amount of numerical simulation and experiments for the heat pipe can neither the heat absorption capacity not enough, can not the heat absorption capacity too big again.
As shown in fig. 4, when the heat pipe is viewed from the top downwards, or in the horizontal plane projection, the outer diameter of the heat pipe is d, the distance between the centers of adjacent heat pipes in the same row is S, the vertex angle of the isosceles triangle formed by the center of the heat pipe and the centers of two adjacent heat pipes in the adjacent row is a, and the following requirements are met:
Sin(A)＝a*(d/S)3-b*(d/S)2+ c (d/S) + e, where a, b, c, e are parameters, satisfying the following requirements:
8.20<a<8.22,6.19<b<6.21；0.062<c<0.063,0.83<e<0.84,0.12<d/S<0.55。
preferably, a is 8.21, b is 6.20, c is 0.0625, and d is 0.835;
preferably, as d/S is gradually decreased, a is larger, b is smaller, c is larger, and e is larger.
Preferably, 15 ° < a <80 °.
Further preferably, 20 ° < a <40 °.
Further preferably, 0.3< d/S < 0.5.
Preferably, along the flowing direction of the fluid in the heat collecting tube, a is larger, b is smaller, c is larger, and e is larger.
The above empirical formula is obtained through a large number of numerical simulations and experiments, and takes the form of a 3 rd order polynomial. The structure obtained by the relational expression can further realize the optimized heat pipe structure, and the error is basically within 2.5 percent through experimental verification, so that the error is further reduced.
Preferably, the tube diameter of the heat collecting tube is 400-600 mm, and more preferably 500 mm.
The outer diameter d of the heat pipe is 9 to 12 mm, and more preferably 11 mm.
Further preferably, as shown in fig. 6, the improved solar system includes a heat collector 5, a heat accumulator 41, a heat radiator 42, a valve 16, a valve 14, a valve 15, and a temperature sensor 17, where the heat collector 5 is communicated with the heat accumulator 41 to form a circulation loop, the heat collector 5 is communicated with the heat radiator 42 to form a circulation loop, pipelines where the heat accumulator 41 and the heat radiator 42 are located are connected in parallel, the heat collector 5 absorbs solar energy to heat water in the heat collector 5, the heated water enters the heat accumulator 41 and the heat radiator 42 through a water outlet pipeline 8 respectively to exchange heat in the heat radiator 42, and water flowing out of the heat accumulator 41 and the heat radiator 42 enters the heat collector 5 through a water return pipeline 17 to exchange heat.
As shown in fig. 6, a valve 16 is provided on the outlet pipe for controlling the total amount of water entering the heat accumulator 41 and the radiator 42, a valve 14 is provided at the position of the inlet pipe 16 of the pipe in which the radiator 42 is located for controlling the flow rate of water entering the radiator 42, a valve 15 is provided at the position of the inlet pipe 10 of the pipe in which the heat accumulator 41 is located for controlling the flow rate of water entering the heat accumulator 41, and a temperature sensor 17 is provided at the position of the inlet of the radiator 42 for measuring the temperature of water entering the radiator 42. The central controller 7 is in data connection with the valves 16, 14, 15 and the temperature sensor 17 in order to monitor the opening of the valves 16, 14, 15 and the temperature measured by the temperature sensor.
Preferably, the central controller 7 is in data connection with a cloud server so as to transmit monitored data to the cloud server, the cloud server is connected with a client, and the client can obtain various monitored information through the cloud server.
Preferably, when the temperature measured by the temperature sensor 17 is lower than a certain temperature, the central controller 7 controls the valve 14 to increase the opening degree, and controls the valve 15 to decrease the opening degree, so as to increase the flow rate of the hot water into the radiator 42 to increase the heat radiation amount. When the temperature measured by the temperature sensor 17 is higher than a certain temperature, the central controller controls the valve 14 to decrease the opening degree, and controls the valve 15 to increase the opening degree, so as to decrease the flow rate of the hot water entering the radiator 42 to decrease the heat radiation amount.
Preferably, the mode of operation is an automatic mode.
Preferably, the central controller 7 is in data connection with a cloud server so as to transmit the monitored opening of the valve 14, the opening of the valve 15 and the temperature data of the water entering the heat sink 42 to the cloud server, and the cloud server is connected with a client, and the client can obtain the monitored data through the cloud server.
The client can input numerical values of the opening degrees of the valve 14 and the valve 15 according to the obtained data, transmit the numerical values to the central controller 7 through the cloud server, and adjust the opening degrees of the valve 14 and the valve 15 through the central controller. This mode of operation is a manual mode.
When the temperature measured by the temperature sensor 17 is low to a certain degree, the capacity of the heat exchanger of the heat radiator for external heat exchange is poor at the moment, and the normal heating requirement cannot be met, which indicates that the heat collecting capacity of the solar heat collector is also problematic, for example, the sunlight is not very strong, or the sun is absent at night, at the moment, the central controller controls the valve 16 to be automatically closed, the valve 14 and the valve 15 are completely opened, the pipelines where the heat accumulator 41 and the heat radiator 42 are located form a circulation pipeline, water enters the heat accumulator 41, the heat energy stored in the heat accumulator 41 heats the water entering the heat accumulator 41, and the heated water enters the heat radiator 42 for heat radiation.
Preferably, the client manually inputs an instruction according to the obtained temperature data measured by the temperature sensor 17, transmits the instruction to the cloud server, and then transmits the instruction to the central controller 7 through the cloud server to determine whether to close the valve 16 and completely open the valve 14 and the valve 15.
Through the operation, when the sunlight is strong, after the heat dissipation capacity of the radiator 42 is met, namely the heat dissipation requirement of a user is met, the excessive heat is stored through the heat accumulator 41, and under the condition that the heat supply capacity of the solar heat collector 5 is insufficient, the heat energy stored by the heat accumulator is utilized to heat circulating water so as to meet the heat dissipation requirement of the radiator 42. Therefore, solar energy can be fully utilized, and waste of excessive heat is avoided.
Preferably, the flow rate of water may be automatically controlled without using the temperature of water entering the radiator 42, and the flow rate of water entering the radiator 42 may be automatically controlled by measuring the ambient temperature around the radiator, for example, by measuring the indoor temperature of the radiator (by providing an indoor temperature sensor that is in data connection with the central controller), and if the indoor temperature is too low, the central controller automatically increases the opening degree of the valve 14 to increase the flow rate of water entering the radiator 42, and if the indoor temperature is too high, the central controller automatically decreases the opening degree of the valve 14 to decrease the flow rate of water entering the radiator 42.
Preferably, the central controller 7 transmits the monitored opening of the valve 14 and the indoor temperature data to a cloud server, the cloud server is connected with a client, and the client can obtain the monitored data through the cloud server.
The client can input the numerical value of the opening of the valve 14 according to the obtained data, transmits the numerical value to the central controller 7 through the cloud server, and manually adjusts the opening of the valve 14 through the central controller 7.
Of course, it is preferable that the flow rate is controlled by the indoor temperature on the premise that the temperature measured by the temperature sensor 17 needs to be higher than a certain temperature, otherwise, when the heat collecting capability of the solar heat collector is deteriorated, the heat radiation effect is not good no matter how the flow rate is increased.
When the pipe in which the heat accumulator and the radiator are located forms a circulation pipe, when the temperature measured by the temperature sensor 17 is lower than a certain temperature, the central controller controls the valve 14 to increase the opening degree, and controls the valve 15 to increase the opening degree, so that the flow rate of hot water entering the radiator 42 is increased to increase the heat radiation amount. When the temperature measured by the temperature sensor 17 is higher than a certain temperature, the central controller controls the valve 14 to decrease the opening degree, and simultaneously controls the valve 15 to decrease the opening degree, so as to decrease the flow rate of the hot water entering the radiator 42 to increase the heat radiation amount. The opening degrees of the valves 14 and 15 at this time are kept uniform.
The client can input numerical values of the opening degrees of the valve 14 and the valve 15 according to the obtained data, transmits the numerical values to the central controller 7 through the cloud server, and manually adjusts the opening degrees of the valve 14 and the valve 15 through the central controller 7.
Through such control, the heat of the heat accumulator can be reasonably utilized, and the loss of heat can be avoided.
Although the present invention has been described with reference to the preferred embodiments, it is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (1)
1. A trough solar thermal collector comprises a reflector and a heat collecting pipe, wherein the heat collecting pipe is positioned at the focus position of the reflector, and the reflector reflects solar energy to the heat collecting pipe for heating water in the heat collecting pipe;
along the flowing direction of fluid in the heat collecting pipe, the distribution density of the heat pipe is increased more and more continuously;
the length of the heat collecting pipe is C, and along the fluid flowing direction of the heat collecting pipe, the density of the heat pipe at the most front end is MTailThen, the density M of the heat pipe at a distance of l from the foremost end of the heat pipe is as follows:
M＝b*Mtail+c*MTail*(l/C)aWherein a, b and c are coefficients, and the following requirements are met:
1.075<a<1.119,0.94<b+c<0.99，0.465<b<0.548。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810366348 | 2018-04-23 | ||
| CN2018103663480 | 2018-04-23 |
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| CN109506375A CN109506375A (en) | 2019-03-22 |
| CN109506375B true CN109506375B (en) | 2020-03-17 |
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| CN201811421183.9A Active CN109506375B (en) | 2018-04-23 | 2018-11-27 | Slot type solar heat collector |
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| CN1908549B (en) * | 2006-08-21 | 2010-05-12 | 河海大学 | Heat pipe type spherical disc type solar energy light and heat collecting system |
| CN102620442B (en) * | 2012-02-28 | 2014-04-02 | 中国石油大学(华东) | Solar heat collector based on groove type parabolic mirror and artificial blackbody |
| CN104819583B (en) * | 2015-04-28 | 2016-04-20 | 山东大学（威海） | A kind of solar thermal collection system |
| CN106440411B (en) * | 2016-10-13 | 2018-08-07 | 嘉兴恒日太阳能科技有限公司 | A kind of high optically focused heat accumulating type solar heat hydrophone |
| CN108591982A (en) * | 2018-04-24 | 2018-09-28 | 青岛中正周和科技发展有限公司 | A kind of solar steam generator of long-range vapor (steam) temperature control valve |
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