CN112113354A - Heat collector constant-pressure pipe diameter optimization design method - Google Patents
Heat collector constant-pressure pipe diameter optimization design method Download PDFInfo
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- CN112113354A CN112113354A CN202010927806.0A CN202010927806A CN112113354A CN 112113354 A CN112113354 A CN 112113354A CN 202010927806 A CN202010927806 A CN 202010927806A CN 112113354 A CN112113354 A CN 112113354A
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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
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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
- F24S70/60—Details of absorbing elements characterised by the structure or construction
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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
- F24S2010/71—Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits the conduits having a non-circular cross-section
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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
- F24S70/60—Details of absorbing elements characterised by the structure or construction
- F24S2070/62—Heat traps
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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 method for optimally designing the pipe diameter of a constant-pressure pipe of a heat collector, which comprises the heat collector, wherein the heat collector comprises heat collecting pipes, a constant-pressure pipe is arranged between at least two adjacent heat collecting pipes, a plurality of constant-pressure pipes are arranged between the adjacent heat collecting pipes along the flowing direction of fluid in the heat collecting pipes, and the pipe diameter d of the constant-pressure pipe is designed as follows: the length from the fluid inlet of the heat collecting pipe to the fluid outlet of the heat collecting pipe is L, d = F (L), and the first derivative of F (L) is larger than 0. The invention can ensure that the pressure is balanced as soon as possible in the flowing process of the fluid through the arrangement.
Description
The invention relates to a divisional application of application date 2018, 8, 5 and application number 2018108816389 with the name of 'a trough type solar heat collector system'.
Technical Field
The invention belongs to the field of solar energy, and particularly relates to a solar heat collector.
Background
With the rapid development of modern socioeconomic, the demand of human beings on energy is increasing. However, the continuous decrease and shortage of traditional energy reserves such as coal, oil, natural gas and the like causes the continuous increase of price, and the environmental pollution problem caused by the conventional fossil fuel is more serious, which greatly limits the development of society and the improvement of the life quality of human beings. Solar heat conversion is a solar energy utilization mode which has high energy conversion efficiency and utilization rate, low cost and can be widely popularized in the whole society. In solar thermal energy utilization devices, it is critical to convert solar radiant energy into thermal energy, and the devices that accomplish this conversion are known as solar collectors.
In a solar thermal collector, a heat collecting tube structure is a very common form, and such a structure generally includes a plurality of parallel heat collecting tubes, but fluid distribution in different heat collecting tubes is often uneven during operation, and there are also different pressures in different heat collecting tubes due to different fluid temperatures in different heat collecting tubes caused by uneven heating. Under the condition, the heat collecting pipe with high pressure is damaged due to long-term operation, so that the heat collector cannot operate effectively on the whole.
In addition, the heat collecting pipes absorb solar energy to form a steam-water mixture in heat exchange, the steam-liquid mixture causes the steam to be mixed into a whole, the heat exchange capacity between the steam-water mixture and liquid is reduced, and the heat exchange efficiency is greatly influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a solar heat collector with a novel structure, and simultaneously provides a heat collecting tube with a novel structure, and the heat collecting tube has the advantages of rapid heating, stable flow, good heat exchange effect and improvement on the utilization efficiency of solar heat.
In order to achieve the purpose, the invention adopts the following technical scheme:
a trough type solar heat collection system comprises a heat collector, wherein the heat collector comprises a heat collection pipe and a reflector, the heat collection pipe absorbs solar energy and heats water in the heat collection pipe, a stabilizing device is arranged in the heat collection pipe, the stabilizing device is of a sheet structure, and the sheet structure is arranged on the cross section of the heat collection pipe; the stabilizing device is composed of a square through hole and a regular octagonal through hole, the side length of the square through hole is equal to that of the regular octagonal through hole, four sides of the square through hole are respectively sides of four different regular octagonal through holes, and four mutually spaced sides of the regular octagonal through hole are respectively sides of four different square through holes.
Preferably, the cross section of the heat collecting pipe is square.
Preferably, the heat collecting pipes are connected in parallel, the lower part of each heat collecting pipe corresponds to one reflector, and the end parts of the reflectors are connected to form an integral structure.
Preferably, the water of the heat collector is delivered to a heat utilization device, the steam utilization device is a liquid medicine heat exchanger, and the water in the water tank is used as a heat source for heating liquid medicine.
Preferably, the heat collecting pipe is formed by welding a multi-section structure, and a stabilizing device is arranged at the joint of the multi-section structure.
Preferably, the distance between adjacent stabilizing devices is M1, the side length of the square through hole is B1, the heat collecting tube is a square section, and the side length of the square section of the heat collecting tube is B2, so that the following requirements are met:
M1/B2=a*Ln(B1/B2) +b
wherein a, b are parameters, wherein 1.739< a <1.740,5.00< b < 5.10;
11<B2<46mm；
1．9<B1<3.2mm；
18<M1<27mm。
20°<A<60°。
preferably, 30 ° < a <50 °.
Further preferably, a is smaller and B is larger as B1/B2 is increased.
Preferably, a =1.7395, b = 5.05;
preferably, m becomes smaller as a increases.
Preferably, the water in the heat collecting tube is heated and then delivered to the heat utilization device, the steam utilization device is a liquid medicine heat exchanger, and the heated water is used as a heat source for heating liquid medicine.
Preferably, the stabilizing device comprises at least one of a square central stabilizing device with a square through hole in the center of the collector tube and a regular octagonal central stabilizing device with a regular octagonal through hole in the center of the collector tube.
Preferably, the adjacently arranged stabilizing means are of different types.
Preferably, a plurality of stabilizing devices are arranged in the heat collecting pipe, the distance from the inlet of the heat collecting pipe is H, the distance between every two adjacent stabilizing devices is S, and S = F1(H) The following requirements are met:
S’<0, S”>0。
preferably, a plurality of stabilizing devices are arranged in the evaporation end of the heat collecting tube, the distance from the evaporation end of the heat collecting tube to the inlet of the heat collecting tube is H, the side length of a square through hole of each stabilizing device is D, and D = F3(H) The following requirements are met:
D’<0, D”>0。
preferably, a groove is formed in the inner wall of the heat collecting pipe, the shell of the stabilizing device is arranged in the groove, and the inner wall of the shell is aligned with the inner wall of the heat collecting pipe.
The invention has the following advantages:
1) the invention provides a solar heat collector with a novel structure of a novel combination of square through holes and regular octagon through holes, wherein the included angles formed by the edges of the formed square holes and regular octagon holes are larger than or equal to 90 degrees through the squares and the regular octagons, so that fluid can fully flow through each position of each hole, and the short circuit of fluid flow is avoided or reduced. The invention separates the two-phase fluid into liquid phase and gas phase by the stabilizing device with a novel structure, divides the liquid phase into small liquid groups, divides the gas phase into small bubbles, inhibits the backflow of the liquid phase, promotes the smooth flow of the gas phase, plays a role in stabilizing the flow and improves the heat exchange effect. Compared with the stabilizing device in the prior art, the stabilizing device further improves the flow stabilizing effect, strengthens heat transfer and is simple to manufacture.
2) According to the invention, through reasonable layout, the square and regular octagonal through holes are uniformly distributed, so that the fluid on the whole cross street is uniformly divided, and the problem of nonuniform division of the annular structure along the circumferential direction in the prior art is avoided.
3) The invention ensures that the large holes and the small holes are uniformly distributed on the whole cross section by uniformly distributing the square holes and the regular octagonal holes at intervals, and ensures that the separation effect is better by changing the positions of the large holes and the small holes of the adjacent stabilizing devices.
4) According to the invention, the stabilizing device is of a sheet structure, so that the stabilizing device is simple in structure and low in cost.
5) According to the invention, the optimal relation size of the parameters is researched by setting the regular changes of the parameters such as the distance between adjacent stabilizing devices, the side length of the hole of the stabilizing device, the pipe diameter of the heat absorbing pipe, the pipe spacing and the like in the height direction of the heat absorbing pipe, so that the current stabilizing effect is further achieved, the noise is reduced, and the heat exchange effect is improved.
6) The invention realizes the optimal relational expression of the heat exchange effect under the condition of meeting the flow resistance by widely researching the heat exchange rule caused by the change of each parameter of the stabilizing device.
7) The solar heat collector with a novel structure is provided, and the pressure in each heat collecting pipe is uniform, the distribution of fluid flow is uniform, and the distribution of fluid motion resistance is uniform by arranging the constant pressure pipes among the heat collecting pipes.
Description of the drawings:
fig. 1 is a schematic structural diagram of a solar collector system according to the present invention.
Fig. 2 is a schematic cross-sectional view of a solar collector of the present invention.
Fig. 3 is another schematic structural diagram of the solar heat collector of the present invention.
FIG. 4 is a schematic cross-sectional view of a stabilization device of the present invention.
FIG. 5 is a schematic view of another cross-sectional structure of the stabilization device of the present invention.
FIG. 6 is a schematic view of the arrangement of the stabilizing device of the present invention within a heat collecting tube.
FIG. 7 is a schematic cross-sectional view of the arrangement of the stabilizing device of the present invention within a heat collecting tube.
FIG. 8 is a schematic cross-sectional view of a heat collecting tube with a constant pressure tube according to the present invention.
In the figure: 1. the solar heat collector comprises a heat collector body, 11 heat collecting pipes, 12 reflectors, 2 heat utilization devices, 3 pressure balancing pipes, 4 stabilizing devices, 41 square through holes, 42 regular octagon through holes and 43 sides.
Detailed Description
A trough type solar heat collection system is shown in figures 1-2 and comprises a heat collector 1 and a heat utilization device 2, wherein the heat collector 1 comprises a heat collection pipe 11 and a reflector 12, the heat collection pipe 11 absorbs solar energy, heated water forms a steam-water mixture or steam and enters the heat utilization device 2 to exchange heat in the heat utilization device 2, and the water after heat exchange in the heat utilization device 2 enters the heat collection pipe 11 to be continuously heated.
Preferably, as shown in fig. 1, the heat collector 1 is a parallel-series hybrid structure.
Preferably, as shown in fig. 3, the heat collecting tubes 11 are connected in parallel, the lower portion of each heat collecting tube 11 corresponds to one reflector 12, and the ends of the reflectors 12 are connected to form an integral structure. Through the structure, more heat collecting pipes can be distributed in a unit space, so that the space is saved, and the solar energy is fully utilized.
Preferably, as shown in fig. 8, the adjacent heat collecting pipes 11 are communicated with each other through the constant pressure pipe 3.
In the operation process of the heat collector, fluid distribution is uneven, in addition, in the heat collection process, the temperatures of fluids in different heat collection tubes are different due to different absorbed heat of different heat collection tubes, and in some heat collection tubes, even fluid, such as water, is in a gas-liquid two-phase state, and the fluid in some heat collection tubes is still liquid, so that the pressure in the heat collection tubes is increased due to the fact that the fluid is changed into steam, and therefore through arranging the constant pressure tubes among the heat collection tubes, the fluid can flow in the heat collection tubes mutually, the pressure distribution in all the heat collection tubes is balanced, and the fluid distribution can be promoted to be balanced.
Preferably, the solar collector further comprises a pressure measuring device for measuring the pressure of the heat collecting pipe. The pressure measuring device is connected to the heat collecting pipe 11, whether the heat collecting pipe 11 leaks or not is checked by measuring the pressure in the heat collecting pipe 11, once the leakage occurs, the measuring data of the pressure measuring device is abnormal, and the fluid valve entering the heat collecting pipe 11 is closed in time.
Preferably, the heat collector further comprises a control system and a valve, wherein the control system is in data connection with the valve and is used for controlling the opening and closing of the valve and the flow of the valve. The control system is in data connection with the pressure measuring device and is used for detecting the pressure measured by the pressure measuring device. Once the pressure of the pressure measuring device detected by the control system is lower than a preset value, the pressure is abnormal, and the heat collecting tube 11 is likely to leak, at the moment, the control system controls the valve to be automatically closed, and fluid is forbidden to flow into the heat collecting tube. Through the automatic control function, the monitoring process is automated.
The heat collecting pipes 11 are communicated with each other through a constant pressure pipe 3, and preferably, the pressure measuring device can be connected with any one of the heat collecting pipes 11.
Through setting up constant voltage pipe 3 for a plurality of thermal-collecting tubes 11 communicate, in case a certain thermal-collecting tube takes place to leak, then because the reason of intercommunication, pressure measurement device also can detect pressure anomaly at any time, then also can automatic control fluid valve close, avoids during the fluid enters into the heat exchange tube. Therefore, the number of the pressure measuring devices can be reduced, and the pressure detection of all the heat collecting pipes can be realized only by one or a small number of pressure measuring devices.
Preferably, as shown in fig. 1, the fluid first passes through the inlet headers of the heat collecting pipes, then enters each heat collecting pipe 11 through the inlet headers, and then flows out from the outlet headers after being heated. The valve is disposed in the line from which the fluid enters the inlet header. Thus, when leakage is detected, the valve is automatically closed, and fluid cannot enter the inlet header and naturally cannot enter the heat collecting pipe.
Preferably, a temperature sensor is arranged at the outlet of each heat collecting pipe and used for measuring the temperature of the fluid at the outlet of the heat collecting pipe. The control system is in data connection with the temperature sensors, and the heating condition of each heat collecting pipe is judged according to data detected by the temperature sensors. For example, the control system can find out the heat collecting tube with low outlet temperature, check the heat collecting tube, find out the reason of the problem and facilitate improvement. The control system can also automatically remind that the outlet temperature of the heat collecting pipe is lower than a normal value. This is one aspect of the present application and is not common general knowledge.
As shown in fig. 8, a constant pressure pipe 3 is arranged between the heat collecting pipes. A constant pressure pipe 3 is arranged between at least two adjacent heat collecting pipes 11. In the research, it is found that in the process of heat absorption of the heat collecting tubes, the heat absorption capacity of the heat collecting tubes at different positions is different, so that the pressure or the temperature between the heat collecting tubes 11 is different, thus the temperature of part of the heat collecting tubes 11 is too high, the service life is shortened, and once the heat collecting tubes 11 are out of order, the problem that the whole solar system cannot be used is possibly caused. According to the invention, through a great deal of research, the constant pressure pipes 3 are arranged on the adjacent heat collecting pipes, so that under the condition that the heat collecting pipes are heated differently to cause different pressures, the fluid in the heat collecting pipe 11 with large pressure can rapidly flow to the heat collecting pipe 11 with small pressure, thereby keeping the overall pressure balance and avoiding local overheating or overcooling.
Preferably, a plurality of constant pressure pipes 3 are arranged between adjacent heat collecting pipes 11 along the flowing direction of the fluid in the heat collecting pipes 11. Through the arrangement of the balance pressure pipes, the pressure of the fluid can be continuously balanced in the heat absorption and evaporation process, and the pressure balance in the whole heat collection pipe is ensured.
Preferably, the distance between the adjacent constant pressure tubes 3 is continuously reduced along the flowing direction of the fluid in the heat collecting tube 11. The purpose is to arrange more constant pressure pipes, because the fluid continuously absorbs heat along with the upward flow of the fluid, and the pressure in different heat collecting pipes is more and more uneven along with the continuous heat absorption 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 distance between the adjacent constant pressure pipes is decreased more and more along the flowing direction of the fluid in the heat collecting pipe 11. 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 the constant pressure tube 3 is increased along the flowing direction of the fluid in the heat collecting tube 11. The purpose is to ensure a larger communication area, because the fluid continuously absorbs heat to generate steam along with the upward flow of the fluid, and the temperature and pressure in different heat collecting pipes are more and more uneven along with the continuous difference of the steam, 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 the constant pressure tube 3 increases more and more along the flowing direction of the fluid in the heat collecting tube 11. 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.
The heat collecting pipe generates vapor-liquid two-phase flow because of absorbing solar energy, so that the fluid in the heat collecting pipe is vapor-liquid mixture. Therefore, the present invention adopts a new structure to separate vapor phase and liquid phase, so that the heat exchange is enhanced.
A stabilizing device 4 is arranged in the heat collecting pipe, and the structure of the stabilizing device 4 is shown in figures 4 and 5. The stabilizing device 4 is a sheet structure which is arranged on the cross section of the heat collecting pipe 11; the stabilizing device 4 is composed of a square and regular octagonal structure, so that a square through hole 41 and a regular octagonal through hole 42 are formed. The side length of the square through-hole 41 is equal to the side length of the regular octagonal through-hole 42 as shown in fig. 4, the four sides 43 of the square through-hole are the sides 43 of four different regular octagonal through-holes, respectively, and the four mutually spaced sides 43 of the regular eight deformed through-hole are the sides 43 of four different square through-holes, respectively.
The invention adopts a stabilizing device with a novel structure, and has the following advantages:
1) the invention provides a novel structure stabilizing device combining a square through hole and a regular octagon through hole, wherein the included angles formed by the edges of the formed square hole and the regular octagon hole are larger than or equal to 90 degrees through the square and the regular octagon, so that fluid can fully flow through each position of each hole, and the short circuit of the fluid flow is avoided or reduced. The two-phase fluid is separated into the liquid phase and the gas phase by the stabilizing device with the novel structure, the liquid phase is separated into small liquid masses, the gas phase is separated into small bubbles, the backflow of the liquid phase is inhibited, the gas phase is enabled to flow smoothly, the flow stabilizing effect is achieved, the vibration and noise reducing effect is achieved, and the heat exchange effect is improved. Compared with the stabilizing device in the prior art, the stabilizing device further improves the flow stabilizing effect, strengthens heat transfer and is simple to manufacture.
2) According to the invention, through reasonable layout, the square and regular octagonal through holes are uniformly distributed, so that the fluid on the whole cross street is uniformly divided, and the problem of nonuniform division of the annular structure along the circumferential direction in the prior art is avoided.
3) According to the invention, the square holes and the regular octagonal through holes are uniformly distributed at intervals, so that the large holes and the small holes are uniformly distributed on the whole cross section, and the separation effect is better through the position change of the large holes and the small holes of the adjacent stabilizing devices.
4) According to the invention, the stabilizing device is of a sheet structure, so that the stabilizing device is simple in structure and low in cost.
By arranging the square holes and the regular octagon stabilizing devices, the invention equivalently increases the internal heat exchange area in the heat exchange tube, strengthens the heat exchange and improves the heat exchange effect.
According to the invention, because the gas-liquid two phases are segmented at all cross section positions of the heat exchange tube, the contact area between the segmentation of a gas-liquid interface and a gas-phase boundary layer and a cooling wall surface is realized on the whole cross section of the heat exchange tube, the disturbance is enhanced, the noise and the vibration are greatly reduced, and the heat transfer is enhanced.
Preferably, the stabilizing device comprises two types, as shown in fig. 4 and 5, the first type is a square central stabilizing device, and a square is positioned in the center of the heat collecting pipe or the condensing pipe, as shown in fig. 6. The second is a regular octagonal central stabilizer, the regular octagon is located at the center of the collector tube, as shown in fig. 4. As a preference, the two types of stabilizing means are arranged next to one another, i.e. the types of stabilizing means arranged next to one another differ. I.e. adjacent to the square central stabilizer is a regular octagonal central stabilizer, and adjacent to the regular octagonal central stabilizer is a square central stabilizer. According to the invention, the square holes and the regular octagon holes are uniformly distributed at intervals, so that the large holes and the small holes are uniformly distributed on the whole cross section, and through the position change of the large holes and the small holes of the adjacent stabilizing devices, the fluid passing through the large holes next passes through the small holes, and the fluid passing through the small holes next passes through the large holes to be further separated, so that the mixing of vapor and liquid is promoted, and the separating and heat exchanging effects are better.
Preferably, the cross section of the heat collecting tube 11 is square.
Preferably, a plurality of stabilizing devices are arranged in the heat collecting tube, and the distance between the stabilizing devices is continuously reduced along the flowing direction of the fluid in the heat collecting tube 11. Setting the distance from the inlet of the heat collecting tube as H, the distance between adjacent stabilizing devices as S, S = F1(H) I.e. S is a function of the height H as a variable, S' is the first derivative of S, satisfying the following requirements:
S’<0;
the main reason is that the liquid in the heat collecting pipe is heated continuously to generate steam, in the rising process, the steam is increased continuously, so that the steam in the gas-liquid two-phase flow is increased, the steam phase in the gas-liquid two-phase flow is increased, the heat exchange capacity in the heat collecting pipe is weakened relatively along with the increase of the steam phase, and the vibration and the noise are increased continuously along with the increase of the steam phase. The distance between adjacent stabilizers to be provided is therefore shorter and shorter.
Through the experiment discovery, through foretell setting, both can reduce vibrations and noise to the at utmost, can improve the heat transfer effect simultaneously.
It is further preferable that the distance between adjacent stabilizing devices is continuously increased along the flowing direction of the fluid in the heat collecting pipe 11. I.e. S "is the second derivative of S, the following requirements are met:
S”>0;
through the experiment, the vibration and the noise of about 7% can be further reduced, and the heat exchange effect of about 8% is improved.
Preferably, the side length of the square is smaller along the flowing direction of the fluid in the heat collecting pipe 11. The distance from the lower end of the heat collecting pipe is H, squareThe side length of the shape is C, C = F2(H) And C' is the first derivative of C, and meets the following requirements:
C’<0;
further preferably, along the flowing direction of the fluid in the heat collecting tube 11, the side length of the square is continuously increased to be smaller and smaller. C' is the second derivative of C, and meets the following requirements:
C”>0。
see the previous variation in the pitch of the stabilizer for specific reasons.
Preferably, the distance between adjacent stabilizers remains constant.
Preferably, the inner wall of the heat collecting pipe is provided with a slit, and the outer end of the stabilizing device is arranged in the slit.
Preferably, the heat collecting pipe is formed by welding a multi-section structure, and a stabilizing device is arranged at the joint of the multi-section structure.
Through analysis and experiments, the distance between the stabilizing devices cannot be too large, the damping, noise reduction and separation effects are poor if the distance is too large, meanwhile, the distance cannot be too small, the resistance is too large if the distance is too small, and similarly, the side length of a square cannot be too large or too small, and the damping and noise reduction effects are poor or the resistance is too large, so that the damping and noise reduction can be optimized under the condition that normal flow resistance (the total pressure bearing is less than 2.5MPa or the on-way resistance of a single heat collecting tube is less than or equal to 5 Pa/M) is preferentially met through a large number of experiments, and the optimal relation of each parameter is arranged.
Preferably, the distance between adjacent stabilizing devices is M1, the side length of the square through hole is B1, the heat collecting tube is a square section, and the side length of the square section of the heat collecting tube is B2, so that the following requirements are met:
M1/B2=a*Ln(B1/B2) +b
wherein a, b are parameters, wherein 1.739< a <1.740,5.00< b < 5.10;
11<B2<46mm；
1．9<B1<3.2mm；
18<M1<27mm。
20°<A<60°。
preferably, 30 ° < a <50 °.
Further preferably, a is smaller and B is larger as B1/B2 is increased.
Preferably, a =1.7395, b = 5.05;
preferably, the side length B1 of the square through hole is the average value of the inner side length and the outer side length of the square through hole, and the side length B2 of the square section of the heat collecting tube is the average value of the inner side length and the outer side length of the heat collecting tube.
Preferably, the length of the outer edge of the square through hole is equal to the length of the inner edge of the square section of the heat collecting pipe.
In practical application, the thermal-collecting tube generally inclines with the horizontal plane, and this application has studied the heat transfer condition under the slope condition. Preferably, the distance between adjacent stabilizing devices is M1, the side length of each square through hole is B1, the heat collecting tube is a square section, the side length of each square section of the heat collecting tube is B2, and an acute angle formed by the heat collecting tube and a horizontal plane is A, so that the following requirements are met:
c*M1/B2=a*Ln(B1/B2) +b
wherein a, b are parameters, wherein 1.739<a<1.740,5.00<b<5.10；c=1/cos(A)mWherein 0.085<m<0.095, preferably m = 0.090.
11<B2<46mm；
1．9<B1<3.2mm；
18<M1<27mm。
20°<A<60°。
Preferably, 30 ° < a <50 °.
Further preferably, a is smaller and B is larger as B1/B2 is increased.
Preferably, the side length B1 of the square through hole is the average value of the inner side length and the outer side length of the square through hole, and the side length B2 of the square section of the heat collecting tube is the average value of the inner side length and the outer side length of the heat collecting tube.
Preferably, the length of the outer edge of the square through hole is equal to the length of the inner edge of the square section of the heat collecting pipe.
As a increases, m becomes smaller.
Preferably, as B2 increases, B1 also increases. However, as B2 increases, the magnitude of the increase in B1 becomes smaller and smaller. The change of the rule is obtained through a large amount of numerical simulation and experiments, and the heat exchange effect and the noise are further improved and reduced through the change of the rule.
Preferably, as B2 increases, M1 decreases. However, as B2 increases, the magnitude of the decrease in M1 becomes smaller and smaller. The change of the rule is obtained through a large amount of numerical simulation and experiments, and the heat exchange effect and the noise are further improved and reduced through the change of the rule.
Learn through analysis and experiment, the interval of thermal-collecting tube also satisfies certain requirement, for example can not too big or the undersize, no matter too big or the undersize can lead to the heat transfer effect not good, because set up stabilising arrangement in this application thermal-collecting tube moreover, consequently stabilising arrangement also has certain requirement to the thermal-collecting tube interval. Therefore, through a large number of experiments, under the condition that the normal flow resistance (the total pressure bearing is less than 2.5Mpa, or the on-way resistance of a single heat collecting pipe is less than or equal to 5 Pa/M) is preferentially met, the damping and noise reduction are optimized, and the optimal relation of each parameter is arranged.
The distance between adjacent stabilizing devices is M1, the side length of a square is B1, the heat collecting tube is a square section, the side length of the heat collecting tube is B2, and the distance between the centers of adjacent heat collecting tubes is M2, so that the following requirements are met:
M2/B2=d*(M1/B2)2+e-f*(M1/B2)3-h*(M1/B2)；
wherein d, e, f, h are parameters,
1.239<d<1.240,1.544<e<1.545,0.37<f<0.38,0.991<h<0.992； 11<B2<46mm；
1．9<B1<3.2mm；
18<M1<27mm。
16<M2<76mm。
the distance between the centers of adjacent heat collecting pipes is M2, which is the distance between the center lines of the heat collecting pipes.
As a increases, n becomes smaller.
20°<A<60°。
Preferably, 30 ° < a <50 °.
Further preferably, d =1.2393, e =1.5445, f =0.3722, h = 0.9912;
preferably, d, e, f are larger and h is smaller as M1/B2 is increased.
In practical application, the thermal-collecting tube generally inclines with the horizontal plane, and this application has studied the heat transfer condition under the slope condition. The distance between adjacent stabilizing devices is M1, the side length of a square is B1, the heat collecting tube is a square section, the side length of the heat collecting tube is B2, an acute angle formed by the heat collecting tube and a horizontal plane is A, and the distance between the centers of adjacent heat collecting tubes is M2, so that the following requirements are met:
c*M2/B2=d*(M1/B2)2+e-f*(M1/B2)3-h*(M1/B2)；
wherein d, e, f, h are parameters,
1.239<d<1.240,1.544<e<1.545,0.37<f<0.38,0.991<h<0.992；c=1/cos(A)nwherein 0.090<n<0.098, preferably n = 0.093.
11<B2<46mm；
1．9<B1<3.2mm；
18<M1<27mm。
16<M2<76mm。
The distance between the centers of adjacent heat collecting pipes is M2, which is the distance between the center lines of the heat collecting pipes.
As a increases, n becomes smaller.
20°<A<60°。
Preferably, 30 ° < a <50 °.
Further preferably, d =1.2393, e =1.5445, f =0.3722, h = 0.9912;
preferably, d, e, f are larger and h is smaller as M1/B2 is increased.
Preferably, as B2 increases, M2 increases, but as B2 increases, the magnitude of the increase in M2 becomes smaller and smaller. The change of the rule is obtained through a large amount of numerical simulation and experiments, and the heat exchange effect can be further improved through the change of the rule.
Preferably, the length of the heat collecting pipe is between 2000 and 2800 mm. More preferably, 2200-.
By optimizing the optimal geometric dimension of the formula, the optimal effect of shock absorption and noise reduction can be achieved under the condition of meeting the normal flow resistance.
For other parameters, such as the wall thickness of the pipe and the wall thickness of the shell, the parameters are set according to normal standards.
Preferably, the heat exchanger 2 is a liquid medicine heat exchanger, and the heat collecting pipe extends into the liquid medicine in the box body and is used for heating the liquid medicine.
Preferably, the heat exchanger 2 is a health product heat exchanger, and the heat collecting pipe extends into the health product in the box body and is used for heating the health product.
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 (4)
1. The heat collector constant-pressure pipe diameter optimization design method comprises a heat collector, wherein the heat collector comprises heat collecting pipes, a constant-pressure pipe is arranged between at least two adjacent heat collecting pipes, a plurality of constant-pressure pipes are arranged between the adjacent heat collecting pipes along the flowing direction of fluid in the heat collecting pipes, and the constant-pressure pipe diameter d is designed as follows:
the length from the fluid inlet of the heat collecting pipe to the fluid outlet of the heat collecting pipe is L, d = F (L), and the first derivative of F (L) is larger than 0.
2. The method of claim 1, wherein the second derivative of f (l) is greater than 0.
3. The designing method as set forth in claim 1, wherein the water of the heat collector is supplied to a heat utilizing device, the steam utilizing device is a liquid medicine heat exchanger, and the water in the water tank is used as a heat source for heating the liquid medicine.
4. The design method as claimed in claim 1, wherein a temperature sensor is disposed at an outlet of each heat collecting tube for measuring a fluid temperature at the outlet of the heat collecting tube, the control system is in data connection with the temperature sensor, and the heating condition of each heat collecting tube is determined according to data detected by the temperature sensor.
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| CN202010927806.0A CN112113354B (en) | 2018-08-05 | 2018-08-05 | Heat collector constant-pressure pipe diameter optimization design method |
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| CN201810881638.9A CN110806016B (en) | 2018-08-05 | 2018-08-05 | Slot type solar collector system |
| CN202010927806.0A CN112113354B (en) | 2018-08-05 | 2018-08-05 | Heat collector constant-pressure pipe diameter optimization design method |
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| CN201810881638.9A Division CN110806016B (en) | 2018-08-05 | 2018-08-05 | Slot type solar collector system |
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| CN112113354A true CN112113354A (en) | 2020-12-22 |
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| CN202010927806.0A Active CN112113354B (en) | 2018-08-05 | 2018-08-05 | Heat collector constant-pressure pipe diameter optimization design method |
| CN202010927799.4A Active CN112113353B (en) | 2018-08-05 | 2018-08-05 | Heat collector constant-pressure tube spacing optimization design method |
| CN202011069851.3A Withdrawn CN112283957A (en) | 2018-08-05 | 2018-08-05 | Design method of inclined heat collector |
| CN201810881638.9A Expired - Fee Related CN110806016B (en) | 2018-08-05 | 2018-08-05 | Slot type solar collector system |
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| CN202011069851.3A Withdrawn CN112283957A (en) | 2018-08-05 | 2018-08-05 | Design method of inclined heat collector |
| CN201810881638.9A Expired - Fee Related CN110806016B (en) | 2018-08-05 | 2018-08-05 | Slot type solar collector system |
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- 2018-08-05 CN CN202011069770.3A patent/CN112283956A/en not_active Withdrawn
- 2018-08-05 CN CN202010927806.0A patent/CN112113354B/en active Active
- 2018-08-05 CN CN202010927799.4A patent/CN112113353B/en active Active
- 2018-08-05 CN CN202011069851.3A patent/CN112283957A/en not_active Withdrawn
- 2018-08-05 CN CN201810881638.9A patent/CN110806016B/en not_active Expired - Fee Related
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| CN202661424U (en) * | 2012-06-29 | 2013-01-09 | 山东力诺新材料有限公司 | Thermal performance testing system of high-temperature thermal-collecting tube |
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Also Published As
| Publication number | Publication date |
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| CN112113353A (en) | 2020-12-22 |
| CN112113354B (en) | 2022-07-29 |
| CN112283957A (en) | 2021-01-29 |
| CN112113353B (en) | 2022-05-17 |
| CN110806016B (en) | 2020-12-01 |
| CN112283956A (en) | 2021-01-29 |
| CN110806016A (en) | 2020-02-18 |
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