CN112212521A

CN112212521A - Solar heat collection device capable of heating and descaling in sections

Info

Publication number: CN112212521A
Application number: CN201910625405.7A
Authority: CN
Inventors: 侯钦鹏; 吴丹淼; 卓超杰; 滕一诺; 王铁信
Original assignee: Qingdao Baiteng Technology Co ltd
Current assignee: Qingjian International Group Co Ltd
Priority date: 2019-07-11
Filing date: 2019-07-11
Publication date: 2021-01-12
Anticipated expiration: 2039-07-11
Also published as: CN112212521B

Abstract

The invention provides a solar heat collection device for heating and descaling in sections, which comprises a heat collection pipe box, a left upper pipe, a right upper pipe and a heat release pipe group, wherein a first outlet and a second outlet are arranged on one side of the heat collection pipe box; the electric heater is arranged into a plurality of sections along the length direction of the heat collecting tube box, each section is independently controlled, along with the change of time, the electric heater is sequentially started along the opposite direction of the fluid flowing direction in the box body within the time of the front section of the period until all the sections are started, and then is sequentially closed from the fluid flowing direction until the period is finished, and all the sections are closed. According to the invention, the electric heater is gradually started along the flowing direction of the fluid, so that the heating temperature at the rear end is high, a similar counter-flow effect is formed, the flowing of the fluid is further promoted, and the elastic vibration effect is increased.

Description

Solar heat collection device capable of heating and descaling in sections

Technical Field

The invention belongs to the field of solar energy, and particularly relates to a solar heat collector system.

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. Energy problems have become one of the most prominent problems in the modern world. Therefore, the search for new energy sources, especially clean energy sources without pollution, has become a hot spot of research.

Solar energy is inexhaustible clean energy and has huge resource amount, and the total amount of solar radiation energy collected on the surface of the earth every year is 1 multiplied by 10¹⁸kW.h, which is ten thousand times of the total energy consumed in the world year. The utilization of solar energy has been used as an important item for the development of new energy in all countries of the world. However, the solar radiation has a small energy density (about one kilowatt per square meter) and is discontinuous, which brings certain difficulties for large-scale exploitation and utilization. Therefore, in order to widely use solar energy, not only the technical problems but also the economic competition with conventional energy sources is required.

Aiming at the structure of a heat collector, the prior art has been researched and developed a lot, but the heat collecting capability is not enough on the whole, and the problem that the operation time is long and scaling is easy to happen, so that the heat collecting effect is influenced.

In any form and structure of solar collector, there is an absorption component for absorbing solar radiation, and the structure of the collector plays an important role in absorbing solar energy.

Aiming at the problems, the invention improves on the basis of the prior invention and provides a novel loop heat pipe solar heat collecting systematization, thereby solving the problems of low heat exchange quantity of the heat pipe and uneven heat exchange.

In application, the continuous heat collection and heating of solar energy or no heating at night can cause the internal fluid to form stability, namely the fluid does not flow or has little fluidity or the flow is stable, so that the vibration performance of the heat collection tube is greatly weakened, and the descaling and heating efficiency of the heat collection tube is influenced. There is therefore a need for improvements to the above-mentioned solar collectors.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a heat collecting device with a novel structure. The heat collecting device can collect heat in the daytime, and can perform auxiliary heating and descaling operations at night, so that the heat utilization effect and the descaling effect are improved.

In order to achieve the purpose, the invention adopts the following technical scheme:

a heat collecting device comprises a heat collecting pipe box, a left upper pipe, a right upper pipe and a heat releasing pipe group, wherein the heat collecting pipe box, the left upper pipe, the right upper pipe and the heat releasing pipe group are positioned at the lower part, the left upper pipe and the right upper pipe are positioned at the upper part of the heat collecting pipe box, the heat releasing pipe group comprises a left heat releasing pipe group and a right heat releasing pipe group, the left heat releasing pipe group is communicated with the left upper pipe and the heat collecting pipe box, the right heat releasing pipe group is communicated with the right upper pipe and the heat collecting pipe box, so that the heat collecting pipe box, the left upper pipe, the right upper pipe and the heat releasing pipe group form a heating fluid closed cycle, the heat releasing pipe group is one or more, each heat releasing pipe group comprises a; the heat collection tube box comprises a first tube opening and a second tube opening, the first tube opening is connected with an inlet of the left heat release tube group, the second tube opening is connected with an inlet of the right heat release tube group, an outlet of the left heat release tube group is connected with the left upper tube, and an outlet of the right heat release tube group is connected with the right upper tube; the electric heater is characterized in that the electric heater is arranged into a plurality of sections along the length direction of the heat collecting tube box, each section is independently controlled, along with the change of time, the electric heater is sequentially started along the opposite direction of the flowing direction of fluid in the box body in the front section time of a period until all the sections are started, and then is sequentially closed from the flowing direction of the fluid until the period is finished, and all the sections are closed.

Preferably, the electric heater is sequentially activated in the opposite direction of fluid flow in the tank for three quarters of the cycle until all segments are activated, and then sequentially deactivated from the direction of fluid flow for the next quarter of the cycle until all segments are deactivated.

Preferably, the left and right heat-releasing tube groups are symmetrical along the middle of the heat collecting tube box.

Preferably, the heat release pipes of the left heat release pipe group are distributed around the axis of the left upper pipe, and the heat release pipes of the right heat release pipe group are distributed around the axis of the right upper pipe.

Preferably, the distance between the center of the upper left tube 21 and the center of the upper right tube 22 is M, the tube diameter of the upper left tube 21 and the radius of the upper right tube 22 are the same, B is B, the radius of the axis of the innermost heat radiation tube in the heat radiation tubes is N1, and the radius of the axis of the outermost heat radiation tube is W2, so that the following requirements are satisfied:

N1/W2= a × Ln (B/M) + B; wherein a, b are parameters and Ln is a logarithmic function, wherein 0.5788< a <0.6002, 1.6619< b < 1.6623; preferably, a is 0.5790 and b is 1.6621.

Preferably, 35< B <61 mm; 230< M <385 mm; 69< N1<121mm, 119< W2<201 mm.

Preferably, the number of the heat release pipes of the heat release pipe group is 3 to 5, preferably 3 or 4.

Preferably, 0.55< N1/W2< 0.62; 0.154< B/M < 0.166.

Preferably, 0.57< N1/W2< 0.61; 0.158< B/M < 0.162.

Preferably, an included angle A formed between the midpoint of the bottom of the heat collection box and the circle centers of the upper left tube 21 and the upper right tube 22 is 40-100 degrees (angle), and preferably 60 degrees (angle).

Preferably, the radius of the heat-radiating pipe is preferably 10-40 mm; preferably 15 to 35mm, more preferably 20 to 30 mm.

The invention has the following advantages:

1. according to the invention, the electric heater is gradually started along the flowing direction of the fluid, so that the heating temperature at the rear end is high, a similar counter-flow effect is formed, the flowing of the fluid is further promoted, and the elastic vibration effect is increased. Through the change of the heating power with time variability, the fluid can be frequently evaporated, expanded and contracted in the elastic tube bundle, so that the vibration of the elastic tube bundle is continuously driven, and the heating efficiency and the descaling operation can be further realized.

2. The invention increases the heating power of the heat exchange tube periodically and continuously and reduces the heating power, so that the heated fluid can generate the volume which is continuously in a changing state after being heated, and the free end of the heat exchange tube is induced to generate vibration, thereby strengthening heat transfer.

3. The invention provides a heat collecting device with a novel structure, which can improve the heat collecting effect, improve the heat releasing capacity of a heat collecting pipe and reduce the energy consumption.

4. The heat collector with new structure has more heat releasing pipe groups in limited space to increase the vibration range of the pipe bundle, strengthen heat transfer and eliminate scale.

5. The heat exchange efficiency can be further improved by the arrangement of the pipe diameters and the interval distribution of the heat release pipe groups in the fluid flowing direction.

6. The invention optimizes the optimal relation of the parameters of the heat collecting device through a large amount of experiments and numerical simulation, thereby realizing the optimal heating efficiency.

Description of the drawings:

FIG. 1 is a front view of a heat collecting device according to the present invention.

FIG. 2 is a front view of the heat collecting system of the present invention.

FIG. 3 is a left side view of the heat collecting device of FIG. 1 according to the present invention.

FIG. 4 is a bottom view of the heat collecting device of FIG. 1 according to the present invention.

FIG. 5 is a schematic view showing the staggered arrangement structure of the heat releasing tube sets of the heat collecting device of the present invention.

FIG. 6 is a schematic diagram of a heat collecting device.

Fig. 7 is a schematic coordinate diagram of intermittent heating by a heat source.

Fig. 8 is a graph of the periodic increase and decrease in heating power coordinates of a heat source.

FIG. 9 is a schematic diagram of the periodic increase and decrease in heating power of the heat source according to another embodiment.

Fig. 10 is a coordinate diagram illustrating linear variation of heating power of the heat source.

In the figure: 1. the heat radiation pipe group comprises a left heat radiation pipe group 11, a right heat radiation pipe group 12, left

upper pipes

21 and 22, right upper pipes, 3, free ends, 4, free ends, 5, free ends, 6, free ends, 7, heat radiation pipes, 8, heat collection pipe boxes, 9, electric heaters, 10 first pipe orifices, 13 second pipe orifices, a left return pipe 14, a

right return pipe

15, 16 reflectors, 17 supporting pieces and a box body 18.

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.

As shown in fig. 1, a heat collecting device comprises a heat collecting pipe box 8, a left upper pipe 21, a right upper pipe 22 and a heat releasing pipe group 1, wherein the heat releasing pipe group 1 comprises a left heat releasing pipe group 11 and a right heat releasing pipe group 12, the left heat releasing pipe group 11 is communicated with the left upper pipe 21 and the heat collecting pipe box 8, the right heat releasing pipe group 12 is communicated with the right upper pipe 22 and the heat collecting pipe box 8, so that the heat collecting pipe box 8, the left upper pipe 21, the right upper pipe 22 and the heat releasing pipe group 1 form a closed circulation of heating fluid, the heat collecting pipe box 8 is filled with phase change fluid, each heat releasing pipe group 1 comprises a plurality of heat releasing pipes 7 in an arc shape, the end parts of the adjacent heat releasing pipes 7 are communicated, so that the plurality of heat releasing pipes; the heat collecting tube box comprises a first tube opening 10 and a second tube opening 13, the first tube opening 10 is connected with an inlet of a left heat-releasing tube group 11, the second tube opening 13 is connected with an inlet of a right heat-releasing tube group 12, an outlet of the left heat-releasing tube group 11 is connected with a left upper tube 21, and an outlet of the right heat-releasing tube group 12 is connected with a right upper tube 22; the first nozzle 10 and the second nozzle 13 are disposed at one side of the heat collecting tube box 8.

Preferably, the left and right heat-releasing

tube groups

11 and 12 are symmetrical along the middle of the heat collecting tube box.

Preferably, the upper left tube 21, the upper right tube 22 and the heat-releasing tube group 1 are disposed inside the tank 18, and a fluid, preferably air or water, is disposed in the tank 18 to flow.

Preferably, the left upper tube 21, the right upper tube 22 and the heat collecting tube box 8 extend in a horizontal direction.

Preferably, the fluid flows in a horizontal direction.

Preferably, a plurality of heat radiation tube groups 1 are arranged along the horizontal direction of the left upper tube 21, the right upper tube 22 and the heat collecting tube box 8, and the heat radiation tube groups 1 are connected in parallel.

Preferably, a left return pipe 14 is disposed between the left upper pipe 21 and the heat collecting tube box 8, and a right return pipe 14 is disposed between the right upper pipe 22 and the heat collecting tube box 8. Preferably, the return pipes are provided at both ends of the heat collecting tube box 8.

The heat collecting tube box 8 is filled with phase-change fluid, preferably vapor-liquid phase-change fluid. The fluid heats and evaporates at the heat collecting tube box 8, flows along the heat release tube bundle to the upper left pipe 21 and the upper right pipe 22, and the fluid can produce volume expansion after being heated, thereby forming steam, and the volume of steam is far greater than water, and the steam that consequently forms can carry out the flow of quick impact formula in the coil pipe. Because of volume expansion and steam flow, the free end of the heat-radiating pipe can be induced to vibrate, the vibration is transmitted to the heat-exchanging fluid in the box body 18 by the free end of the heat-exchanging pipe in the vibrating process, and the fluid can be disturbed mutually, so that the peripheral heat-exchanging fluid forms disturbed flow, a boundary layer is damaged, and the purpose of enhancing heat transfer is realized. The fluid is condensed and released heat on the left upper pipe and the right upper pipe and then flows back to the heat collecting pipe box through the return pipe.

According to the invention, the prior art is improved, and the upper pipe and the heat release pipe groups are respectively arranged into two groups distributed on the left side and the right side, so that the heat release pipe groups distributed on the left side and the right side can perform vibration heat exchange descaling, the heat exchange vibration area is enlarged, the vibration can be more uniform, the heat exchange effect is more uniform, the heat exchange area is increased, and the heat exchange and descaling effects are enhanced. A

The above-mentioned structure has carried out patent application, and this application is to above-mentioned structure further improves, reinforcing scale removal and heat transfer effect.

In the operation of the solar heat collector, although the structure has the elastic vibration descaling effect, the descaling effect needs to be further improved after long-term operation.

It has been found in research and practice that a sustained and stable heat collection results in a stable fluid formation of the internal heat exchange components, i.e. no or little fluid flow, or a stable flow, resulting in a greatly reduced vibration performance of the heat-emitting bank 1, which affects the efficiency of descaling and heating the bank 1. Such as continuous heat collection during the day or continuous non-heat collection during the night, resulting in a reduction in the descaling effect, the following improvements are required for the above-described heat collecting apparatus.

As a modification, an electric heater 9 is provided in the heat collecting tube box 8. The electric heater operates at night, on one hand, the solar heat collecting device is assisted to heat at night, and on the other hand, the heat collecting tube continuously vibrates to remove scale through the operation of the electric heater.

Preferably, the electric heater 9 is a batch type heating method, i.e., heating is performed for a period of time, then heating is stopped for a period of time, and then heating is performed again, and the cycle is not stopped. Preferably, the heating time is 3 times the time without heating.

Preferably, the central electric heater 9 adopts an electric heating mode.

As shown in fig. 7, the heating power P of the electric heater 9 of the heat collecting tube box 8 varies as follows during one cycle time T:

0-3T/4, i.e. three quarters of a period, P ═ n, where n is a constant number in watts (W), i.e. the heating power remains constant;

p =0 in a quarter period of 3T/4-T. I.e. the electric heater 9 does not heat.

Preferably T is 50-80 minutes.

Through the heating with the time variability, the fluid can be frequently evaporated, expanded and contracted in the elastic tube bundle, so that the vibration of the elastic tube bundle is continuously driven, and the heating efficiency and the descaling operation can be further realized.

Preferably, the electric heater 9 is provided in a plurality, each electric heater 9 is independently controlled, and the number of the activated electric heaters 9 is periodically changed along with the change of time.

Preferably, n electric heaters 9 are provided, and in one period T, one electric heater 9 is started at intervals of 3T/4n until the electric heaters 9 are all started at 3T/4, and then one electric heater 9 is stopped at intervals of T/4n until the electric heaters 9 are all stopped at T.

Preferably, the heating power of each electric heater is the same. The relationship diagram is shown in fig. 8.

Preferably, the electric heater 9 is provided in a plurality of stages along the length direction of the heat collecting tube box 8, each stage is independently controlled, and as time changes, the electric heater is sequentially started in the opposite direction of the fluid flowing direction in the box 18 in the front stage of the period until all the stages are started, and then is sequentially closed from the fluid flowing direction until the period is finished, and all the stages are closed.

Preferably, the electric heaters are sequentially activated in the opposite direction of fluid flow in the tank 18 for three quarters of a period 3T/4 until all segments are activated, and then sequentially deactivated from the direction of fluid flow for the following quarter of a period T/4 until all segments are deactivated at the end of the period.

That is, assuming that the electric heater is n segments, in a period T, every 3T/4n, one segment is started from the opposite direction of the fluid flow in the tank 18 until all segments are started at 3T/4, and then every T/4n, one segment is closed from the direction of the fluid flow until all segments are closed at T.

Preferably, the heating power is the same for each section.

The electric heater is gradually started along the flowing direction of the fluid, so that the heating temperature at the rear end is high, a similar counter-flow effect is formed, the flowing of the fluid is further promoted, and the elastic vibration effect is increased. Through the change of the heating power with time variability, the fluid can be frequently evaporated, expanded and contracted in the elastic tube bundle, so that the vibration of the elastic tube bundle is continuously driven, and the heating efficiency and the descaling operation can be further realized.

Preferably, the number of the electric heaters 9 is multiple, each electric heater 9 has different power, one or more electric heaters can be combined to form different heating powers, in the front period of the cycle (preferably three-quarter cycle), according to the time sequence, the single electric heater 9 is started first, the single electric heater 9 is started independently according to the sequence of the sequentially increasing heating powers, then the two electric heaters 9 are started, the two electric heaters 9 are started independently according to the sequence of the sequentially increasing heating powers, then the number of the started electric heaters 9 is increased gradually, if the number is n, the n electric heaters 9 are started independently according to the sequence of the sequentially increasing heating powers; until all the electric heaters 9 are started up finally, the heating power of the heat exchange parts is ensured to be increased in sequence. In the later period of the cycle (preferably, a quarter cycle), firstly, the single electric heater 9 is not started, the single electric heater 9 is not independently started according to the sequence that the heating power is sequentially increased, then the two electric heaters 9 are not started, the two electric heaters 9 are not independently started according to the sequence that the heating power is sequentially increased, then the number of the heat exchange parts which are not started is gradually increased, and if the number is n, the n electric heaters 9 are not started independently according to the sequence that the heating power is sequentially increased; until all the electric heaters 9 are not started, the heating power of the electric heaters 9 is ensured to be reduced in sequence.

For example, the number of the electric heaters 9 is three, namely a first electric heater 9D1, a second electric heater 9D2 and a third electric heater 9D3, and the heating powers are P1, P2 and P3, wherein P1< P2< P3, P1+ P2> P3; that is, the sum of the first electric heater 9 and the second electric heater 9 is larger than the third electric heater 9, and the first, second, third, first plus second, first plus third, second plus third, then first second third, and the order of non-activation in the remaining cycle time is first, second, third, first plus second, first plus third, second plus third, then first second third.

The heating power is gradually increased and decreased by the electric heater 9, so that the flow of the fluid is further promoted, and the elastic vibration effect is increased. Through the change of the heating power with time variability, the fluid can be frequently evaporated, expanded and contracted in the elastic tube bundle, so that the vibration of the elastic tube bundle is continuously driven, and the heating efficiency and the descaling operation can be further realized.

Preferably, the heating power of the electric heater 9 is linearly increased in the front period of the cycle, and the heating power of the heat exchange part is linearly decreased in the rear period of the cycle, see fig. 9.

Preferably, the linearly increasing growth amplitude is smaller than the linearly decreasing growth amplitude.

Preferably, the electric heater 9 is an electric heater.

The linear variation of the heating power is achieved by a variation of the input current or voltage.

By arranging the plurality of electric heaters, the starting of the electric heaters with gradually increased quantity is realized, and the linear change is realized.

Preferably, the period is 50 to 300 minutes, preferably 50 to 80 minutes.

Preferably, the heat release pipes of the left heat release pipe group are distributed around the axis of the left upper pipe, and the heat release pipes of the right heat release pipe group are distributed around the axis of the right upper pipe. The left upper pipe and the right upper pipe are arranged as circle centers, so that the distribution of the heat release pipes can be better ensured, and the vibration and the heating are uniform.

Preferably, the left heat-releasing tube group and the right heat-releasing tube group are both plural.

Preferably, the left heat-releasing tube group and the right heat-releasing tube group are mirror-symmetrical along a plane on which a vertical axis of the heat collecting tube box is located. Through such setting, can make the heat release pipe distribution of heat transfer more reasonable even, improve the heat transfer effect.

Preferably, the heat collecting tube box 8 has a flat tube structure. The heat absorption area is increased by arranging the flat tube structure. So that the heat collecting tube box 8 can be secured at the focal position of the reflecting mirror even if the installation position is somewhat deviated.

Preferably, the left heat-releasing tube group 21 and the right heat-releasing tube group 22 are staggered in the horizontal extending direction, as shown in fig. 5. Through the staggered distribution, can make to vibrate on different length and release heat and scale removal for the vibration is more even, strengthens heat transfer and scale removal effect.

Preferably, a reflecting mirror 16 is provided at a lower portion of the heat collecting device, the heat collecting tube box is located at a focal position of the reflecting mirror 16, and the left and right heat releasing tube groups are located in the fluid passage. Thereby forming a solar energy collection system.

Preferably, a support 17 is included, and the support 17 supports the heat collecting device.

Preferably, a fluid channel is included within which fluid flows. As shown in fig. 2, the heat collecting tube box 8 is located at a lower end of the fluid passage, as shown in fig. 2. The upper left tube 21, the upper right tube 22, the left heat-releasing tube group 11, and the right heat-releasing tube group 12 are provided in the fluid passage, and heat the fluid in the fluid passage by releasing heat.

Preferably, the flow direction of the fluid is the same as the direction in which the left and right

upper tubes

21 and 22 and the heat collecting tube box 8 extend. Through such arrangement, fluid scours the heat pipe set of the house when flowing, especially the free end of the heat pipe set, so that the free end vibrates, heat transfer is enhanced, and the descaling effect is achieved.

Preferably, the heat release tube group 2 is provided in plural (for example, the same side (left side or right side)) along the flow direction of the fluid in the fluid passage, and the tube diameter of the heat release tube group 2 (for example, the same side (left side or right side)) along the flow direction of the fluid in the fluid passage becomes larger.

Along the flowing direction of the fluid, the temperature of the fluid is continuously increased, so that the heat exchange temperature difference is continuously reduced, and the heat exchange capacity is weaker and weaker. Through the pipe diameter grow of heat release nest of tubes, can guarantee that more steam passes through upper portion and gets into heat release nest of tubes, guarantee along fluid flow direction because the steam volume is big and the vibration is effectual to make whole heat transfer even. The distribution of steam in all heat release pipe groups is even, further strengthens heat transfer effect for the whole vibration effect is even, and the heat transfer effect increases, further improves heat transfer effect and scale removal effect.

Preferably, the heat release pipe diameter of the heat release pipe group (for example, the same side (left side or right side)) is increased along the flowing direction of the fluid in the fluid passage.

Through so setting up, avoid the fluid all to carry out the heat transfer at front, and the heat transfer of messenger increases to the rear portion as far as possible to form the heat transfer effect of similar countercurrent. Experiments show that better heat exchange effect and descaling effect can be achieved by adopting the structural design.

Preferably, the heat release pipe groups on the same side (left side or right side) are arranged in plurality along the flowing direction of the fluid in the fluid channel, and the interval between the adjacent heat release pipe groups on the same side (left side or right side) is gradually reduced from the top to the bottom. The specific effect is similar to the effect of the previous pipe diameter change.

Preferably, the spacing between the heat release pipe groups on the same side (left side or right side) along the flowing direction of the fluid in the fluid channel is increased in a decreasing amplitude. The specific effect is similar to the effect of the previous pipe diameter change.

In tests, it was found that the tube diameters and distances of the upper left tube 21 and the upper right tube 22 and the tube diameters of the heat release tubes can have an influence on the heat exchange efficiency and uniformity. If the distance between the collector is too big, then heat exchange efficiency is too poor, and the distance between the heat release pipe is too little, then heat release pipe distributes too closely, also can influence heat exchange efficiency, and the pipe diameter size of collector and heat exchange tube influences the volume of the liquid or the steam that holds, then can exert an influence to the vibration of free end to influence the heat transfer. Therefore, the tube diameters and distances of the upper left tube 21 and the upper right tube 22 and the tube diameters of the heat release tubes have a certain relationship.

The invention provides an optimal size relation summarized by numerical simulation and test data of a plurality of heat pipes with different sizes. Starting from the maximum heat exchange amount in the heat exchange effect, nearly 200 forms are calculated. The dimensional relationship is as follows:

the distance between the center of the upper left tube 21 and the center of the upper right tube 22 is M, the tube diameter of the upper left tube 21 and the radius of the upper right tube 22 are the same, B is B, the radius of the axis of the innermost heat radiation tube in the heat radiation tube is N1, the radius of the axis of the outermost heat radiation tube is W2, and the following requirements are met:

Preferably, 35< B <61 mm; 230< M <385 mm; 69< N1<121mm, 119< W2<201 mm.

Preferably, 0.55< N1/W2< 0.62; 0.154< B/M < 0.166.

Preferably, 0.57< N1/W2< 0.61; 0.158< B/M < 0.162.

Preferably, the arc between the ends of the free ends 3, 4, centered on the central axis of the left header, is 95-130 degrees, preferably 120 degrees. The same applies to the curvature of the free ends 5, 6 and the free ends 3, 4. Through the design of the preferable included angle, the vibration of the free end is optimal, and therefore the heating efficiency is optimal.

Preferably, the tube bundle of the heat-releasing tube group 1 is an elastic tube bundle.

The heat exchange coefficient can be further improved by arranging the tube bundle of the heat release tube group 1 with an elastic tube bundle.

The number of the heat release pipe groups 1 is plural, and the plurality of the heat release pipe groups 1 are in a parallel structure.

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. A heat collecting device comprises a heat collecting pipe box, a left upper pipe, a right upper pipe and a heat releasing pipe group, wherein the heat collecting pipe box, the left upper pipe, the right upper pipe and the heat releasing pipe group are positioned at the lower part, the left upper pipe and the right upper pipe are positioned at the upper part of the heat collecting pipe box, the heat releasing pipe group comprises a left heat releasing pipe group and a right heat releasing pipe group, the left heat releasing pipe group is communicated with the left upper pipe and the heat collecting pipe box, the right heat releasing pipe group is communicated with the right upper pipe and the heat collecting pipe box, so that the heat collecting pipe box, the left upper pipe, the right upper pipe and the heat releasing pipe group form a heating fluid closed cycle, the heat releasing pipe group is one or more, each heat releasing pipe group comprises a; the heat collection tube box comprises a first tube opening and a second tube opening, the first tube opening is connected with an inlet of the left heat release tube group, the second tube opening is connected with an inlet of the right heat release tube group, an outlet of the left heat release tube group is connected with the left upper tube, and an outlet of the right heat release tube group is connected with the right upper tube; the electric heater is characterized in that the electric heater is arranged into a plurality of sections along the length direction of the heat collecting tube box, each section is independently controlled, along with the change of time, the electric heater is sequentially started along the opposite direction of the flowing direction of fluid in the box body in the front section time of a period until all the sections are started, and then is sequentially closed from the flowing direction of the fluid until the period is finished, and all the sections are closed.

2. The heat collecting device as claimed in claim 1, wherein the electric heaters are sequentially turned on in opposite directions of the fluid flow in the housing for three-quarters of a period until all the segments are turned on, and then turned off sequentially from the fluid flow direction for the following quarter of a period until all the segments are turned off.

3. The utility model provides a heat transfer device, heat transfer device is including the thermal-arrest pipe case, upper left pipe, upper right pipe and the heat release nest of tubes that are located the lower part, and upper left pipe, upper right pipe are located the upper portion of thermal-arrest pipe case.