KR20190070374A - Sunlight generation device using Fresnel lens - Google Patents

Abstract

The present invention relates to a solar power generation apparatus using a Fresnel lens. Comprising: a Stirling engine having a high temperature cylinder part and a low temperature cylinder part; A generator connected to the output shaft of the Stirling engine; A Fresnel lens portion; And a solar collecting and storing section for heating the working fluid in the Stirling engine heated by the Fresnel lens section.
The photovoltaic device using the Fresnel lens according to the present invention as described above has a solar collecting and storing part for passing a working fluid moving to the high temperature cylinder part of the stirling engine into the inside thereof, So that the working fluid can be heated to a high temperature in a very short time, and furthermore, the capillary can be used to expand the surface area of the working fluid as much as possible, In particular, it is possible to greatly increase the output shaft's arpeggio, and thus the power generation efficiency due to high-speed rotation can be increased. In addition, since the solar energy obtained through the Fresnel lens can be stored in the heat storage material in the heat storage portion and used when necessary, the solar power can be cut off due to the cloud or the power can be produced even after sunset, have.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a photovoltaic device using a Fresnel lens,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar power generation apparatus, and more particularly, to a solar power generation apparatus using a Fresnel lens capable of efficiently generating electric power by using heat energy condensed through a Fresnel lens as a driving source of a stirling engine.

Power generation using solar energy does not require large-scale power generation facilities such as thermal power generation and nuclear power generation, and it is characterized by small power generation without noise and pollution.

As is well known, there are solar power generation and solar power generation, and solar power generation is a power generation using solar cell module that converts sunlight into electric energy, And the turbine is rotated by the collected energy to produce electric power.

On the other hand, among the various power generation devices that generate electricity using solar heat, a technique of applying a Stirling engine has been proposed. (Korean Patent Registration No. 10-1133043: Power generation apparatus using a Stirling engine)

The Stirling engine has a basic configuration of two cylinders connected by induction pipes, a piston reciprocating within each cylinder, a piston having a phase difference of 90 degrees, and a drive shaft connected to the piston and rotating axially. The working gas is sealed inside the cylinder and the induction pipe. The operating gas reciprocates between the two cylinders and repeats heating and cooling.

The Stirling engine has a few cycles of operation, no explosion stroke, so it has low vibration and noise. Especially, it works when only the high temperature cylinder part of two cylinders is heated, so various kinds of heat sources can be used. For example, solar heat can be used as a heat source.

The conventional power generation apparatus using the Stirling engine has a structure in which a gas inside a heating chamber is heated by using a convex lens and a concave lens and the heated gas is transmitted to a cylinder of a Stirling engine arranged in series to output a rotational force .

However, the structure is overly complicated, especially since four Stirling engines are placed in series, such that the last Stirling engine does not reach enough heat. The output of each Stirling engine must be different and the overall efficiency is inferior.

Korean Patent Registration No. 10-1017891 (cogeneration device using solar energy) Korean Patent Registration No. 10-1133043 (power generation apparatus using a Stirling engine)

An object of the present invention is to provide a photovoltaic generator using a Fresnel lens capable of realizing high efficiency generation by high-speed rotation because the Stirling engine is operated at high output using a Fresnel lens.

Another object of the present invention is to provide a photovoltaic power generation apparatus using a Fresnel lens which can extend the power generation time because solar energy obtained through the Fresnel lens can be stored and used when necessary.

According to an aspect of the present invention, there is provided a solar photovoltaic device using a Fresnel lens, including a high-temperature cylinder and a low-temperature cylinder, a working fluid disposed between the high-temperature cylinder and the low- A working fluid guiding means for guiding the operating fluid to reciprocate between the high temperature cylinder portion and the low temperature cylinder portion; a Stirling engine having an output shaft for rotating the high temperature cylinder portion and the low temperature cylinder portion while rotating axially and transmitting rotational force to the outside; A generator connected to the output shaft of the Stirling engine and generating power by receiving a rotational force of an output shaft; A solar collecting and storing part for applying solar energy delivered from outside to the working fluid to cause the working fluid to move to the hot cylinder part in a heated state; And a Fresnel lens unit for transmitting solar energy to the solar collecting and storing unit to heat the working fluid.

The Fresnel lens unit may further include: A plurality of Fresnel lenses mounted on respective lens mounting holes of the lens frame and passing sunlight to form a plurality of optical focal points in the solar collector and the heat storage unit; And a control unit.

In addition, the solar collecting and storing unit may include: A capillary plate disposed inside the heat collecting case and having a plurality of capillaries for passing the working fluid through the capillary plate; And a heat storage material which heats the capillary plate while enclosing the capillary plate and stores solar energy itself.

Further, the solar collecting and storing unit may include: A heat collecting block which is heated by the heat energy transferred from the Fresnel lens portion; a plurality of heat storage tubes extending in the length direction in the heat collecting block to receive a heat storage material therein; And a plurality of capillaries, both ends of which extend to the outside of the heat storage tube and allow the working fluid to pass therethrough and to be heated.

Further, the working fluid guiding means comprises: A first induction pipe extending in the longitudinal direction and having one end communicating with the low temperature cylinder part and guiding the working fluid flowing out from the low temperature cylinder part into the inside thereof; And a second induction pipe for guiding a working fluid flowing into the high temperature cylinder into the heat collecting and storing unit; A plurality of capillaries connecting the extension ends of the first induction pipe and the second induction pipe and guiding the working fluid flowing through the first induction pipe through the inside thereof to the second induction pipe; A heat collecting case which is heated by receiving the solar energy from the Fresnel lens part and a heat storage case which is filled in the heat collecting case so as to surround the capillary and transfers the solar heat energy transferred from the heat collecting case to the capillary, And the like.

Further, the heat storage material includes alumina sodium chloride.

The photovoltaic device using the Fresnel lens according to the present invention as described above has a solar collecting and storing part for passing a working fluid moving to the high temperature cylinder part of the stirling engine into the inside thereof, So that the working fluid can be heated to a high temperature in a very short time, and furthermore, the capillary can be used to expand the surface area of the working fluid as much as possible, In particular, it is possible to greatly increase the output shaft's arpeggio, and thus the power generation efficiency due to high-speed rotation can be increased.

In addition, since the solar energy obtained through the Fresnel lens can be stored in the heat storage material in the heat storage portion and used when necessary, the solar power can be cut off due to the cloud or the power can be produced even after sunset, have.

FIG. 1 is a view for explaining a basic configuration of a photovoltaic generator using a Fresnel lens according to an embodiment of the present invention.
2 is an exploded perspective view showing a structure of a Fresnel lens unit which can be used in a solar power generation apparatus using a Fresnel lens according to an embodiment of the present invention.
FIG. 3 is a view showing an embodiment of the photovoltaic device shown in FIG.
4 is a structural view of a solar collecting and storing unit applicable to a solar power generating apparatus using a Fresnel lens according to an embodiment of the present invention.
5 is an exploded perspective view of the solar heat collecting and storing portion shown in FIG.
6 is a cross-sectional view showing the internal configuration of the filling tube shown in FIG.
7 is a side view showing another example of the photovoltaic device using the Fresnel lens according to the embodiment of the present invention.
FIG. 8 is a perspective view showing the capillary bundle shown in FIG. 7 separately.

Hereinafter, one embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

The photovoltaic device according to this embodiment, which will be described later, is based on the view that a very great synergy effect can be obtained when the stirling engine, the Fresnel lens, and the solar collecting and storing unit are combined. In particular, by arranging a plurality of Fresnel lenses in a lattice-like pattern and forming a plurality of light-focusing portions on the light-irradiating portion, that is, the surface to be heated, the surface to be heated can be heated very quickly. This is because the light irradiation portion is a heating point.

FIG. 1 is a conceptual diagram for explaining a basic configuration of a solar power generation apparatus using a Fresnel lens according to an embodiment of the present invention.

As shown in the figure, the photovoltaic device 10 using the Fresnel lens according to the present embodiment includes a stirling engine 31 having a high-temperature cylinder portion 32 and a low-temperature cylinder portion 33, 31 and a Fresnel lens unit 20 for heating the solar collecting and storing units 35, 41. The solar collecting and storing unit 35, 41 drives the stuttering engine 31,

The high temperature cylinder part 32 and the low temperature cylinder part 33 are connected to each other by a guide pipe 37 serving as a working fluid guiding means. A working fluid is sealed inside the cylinder 32a of the high temperature cylinder portion 32 and the cylinder 33a of the low temperature cylinder portion 33 and the induction pipe 37. The working fluid may be air, hydrogen or helium.

The working fluid is heated and expanded in the high temperature cylinder part 32 to move the piston 32b in the high temperature cylinder part 32 and the low temperature cylinder part 33 is moved in the high temperature cylinder part 32, So that the working fluid is cooled by the separate cooling means. This operating mechanism is the same as a conventional Stirling engine.

When the high temperature cylinder 32 and the low temperature cylinder 33 are operated, the output shaft 39 rotates and drives the generator 50 connected thereto. It is a matter of course that electric power is produced by driving the power generation section 50.

In the stirling engine 31, as the expansion force of the working fluid press-fitted into the high-temperature cylinder portion 32 is greater and the expansion speed is higher, the output torque of the output shaft 39 becomes larger. That is, as the mechanical efficiency of the stirling engine 31 is increased, the amount of electric power produced increases.

The solar collecting and storing portion 35 and the Fresnel lens portion 20 in the present embodiment serve to increase the mechanical efficiency of the stirling engine 31. [ That is, the working fluid moving to the high-temperature cylinder portion 32 is heated very quickly to raise the output energy of the output shaft 39.

As long as the above function can be performed, the configuration and the individual mechanism of the solar collecting and outputting unit 35 can be variously changed. The solar collecting and outputting unit 35 in this embodiment will be described later.

On the other hand, the Fresnel lens unit 20 passes sunlight irradiated from the sun and collects the sunlight to irradiate the sunlight collecting and storage unit 35. That is, the focal point realized by the Fresnel lens unit 20, is formed on the surface of the solar collecting unit and the heat storage unit 35. [ And the solar heat collecting and storing portion 35 is heated by the Fresnel lens portion 20.

2 is an exploded perspective view showing the structure of the Fresnel lens portion 20 shown in FIG.

The Fresnel lens unit 20 includes a lens frame 21 having a plurality of lens mounting holes 21a and a plurality of Fresnel lenses 21a mounted on the respective lens mounting holes 21a, (22).

The lens frame 21 is disposed above the solar collecting and storing portion 35 through appropriate driving and supporting means. It is natural that the orientation and the angle of the lens frame 21 are changed in accordance with the change of the angle of the sun with time.

The individual lens mounting holes 21a formed in the lens frame 21 take the form of a quadrangle and nine of them form a lattice pattern. As described above, since the Fresnel lens 22 is arranged in a lattice pattern, the light focus is formed in the XY pattern on the surface of the solar collecting and storing portion 35. That is to say, since there are nine Fresnel lenses 22, nine optical focal points are formed in a lattice pattern.

In addition, a support step 21b is provided on the inner side of each lens mounting hole 21a. The support jaw 21b serves to support and fix the rim of the Fresnel lens 22. [ In Fig. 2, nine rectangular Fresnel lenses 22 are applied, but the number and specifications of the Fresnel lens 22 may be varied as needed.

FIG. 3 is a view showing an embodiment of the photovoltaic device shown in FIG. 3 shows the stirling engine 31 in more detail. For reference, the stirling engine 31 has various types such as an alpha-type beta-type gamma-type and an internal configuration depending on an operation mechanism. 3 is an alpha-type stuttering engine.

As shown in the figure, the high-temperature cylinder portion 32 of the stirling engine 31 includes a cylinder 32a, a piston 32b reciprocating in the cylinder 32a, a piston 32b reciprocating in the cylinder 32a, 39 for connecting the connecting rod 32c.

Particularly, the cylinder 32a receives the working fluid heated by the solar collecting and storing part 35 and reciprocates the piston 32b. In fact, the working fluid may be heated while passing through the solar collecting and storing portion 35, and may be heated while entering the inside of the cylinder 32a. The heating portion of the working fluid depends on the structure of the solar collecting and storing portion 35.

The low temperature cylinder portion 33 includes a cylinder 33a and a piston 33b reciprocating in the cylinder 33a and a connecting rod 34b connecting the piston 33b and the output shaft 39 33c.

The high temperature side piston 32b and the low temperature side piston 33b reciprocate with the phase difference of 90 degrees to rotate the output shaft 39 axially. As the speed of the piston is increased, the speed of the output shaft 39 increases as the speed of the internal combustion engine increases.

A heat exchanger (34) is disposed on the side of the low temperature cylinder (33). The heat exchanger (34) is for cooling the working fluid. It is a matter of course that the expansion efficiency in the cylinder 32a is increased if the temperature of the working fluid is low.

The solar collecting and storing unit 35 includes a collecting case 35a that substantially covers the upper portion of the stirling engine 31, a capillary plate 35c accommodated in the collecting case 35a, And a heat storage material 35b filled in the heat collecting case 35a while the capillary plate 35c is being wrapped.

The heat storage material may be alumina sodium chloride or other materials having similar physical properties.

The capillary plate 35c is an aggregate of capillary tubes 35p, which is a very thin straight tube with both ends open. The capillary 35p is arranged in a flat plate shape, that is, in the form of a standing plate.

At both sides of the capillary plate 35c, guide passages 35k and 35m are provided. The induction furnaces 35k and 35m are working fluid inducing means for guiding the working fluid inside the stirling engine 31 to the high temperature cylinder portion 32 and the low temperature cylinder portion 33. [

The right induction passage 35k of the two induction passages 35k and 35m is a passage for guiding the cooled working fluid to the capillary plate 35c through the heat exchanging portion 34. [ The left guide path 35m is a passage for guiding the heated working fluid to the inside of the cylinder 32a through the capillary plate 35c. The working fluid is passed through the capillary plate 35c and between the high temperature cylinder portion 32 and the low temperature cylinder portion 33. [

The heat collecting case 35a is a metal plate having a predetermined thickness, and a light focus irradiated from the Fresnel lens portion 20 is formed on the surface thereof. And is heated by the Fresnel lens portion 20.

In addition, the heat storage material 35b is heated by receiving the solar energy through the heat collection case 35a in a state of being filled in the heat collection case 35a. The heat of the heat storage material 35b is transferred to the capillary plate 35c and used to heat the working fluid. Particularly, the heat storage material 35b has a property of storing heat in itself, and therefore is used when the sunlight is weak after sunset or depending on weather conditions. The power generation time zone of the power generation device 10 is extended by the heat storage material 35b.

4 is a structural view of another type of solar collecting and storing unit applicable to the solar cell generator 10 using the Fresnel lens according to the embodiment of the present invention. And a heat storage unit. 6 is a cross-sectional view showing the internal configuration of the filling tube shown in FIG.

The solar collecting and storing unit 35 of the type shown in Figs. 4 to 6 includes a collecting block 35d having a plurality of receiving grooves 35e on its bottom surface in the form of a block having a predetermined thickness, A plurality of heat storage tubes 35n to be inserted into and to be inserted into the receiving groove 35e, a heat storage material 35b to be filled in the heat storage tubes 35n, And includes a capillary tube 37a and a distribution header 38 extending to both ends of each capillary tube.

First, the heat collecting block 35d is made of a metal having excellent thermal conductivity and has an auxiliary heat collecting plate 35f on its upper surface. The auxiliary heat collecting plate 35f is a plate-shaped member having a predetermined thickness, and receives the solar heat energy irradiated from the Fresnel lens unit 20 and transfers it to the heat collecting block 35d. The auxiliary collecting plate 35f and the collecting block 35d may have the same material.

The auxiliary heat collecting plate 35f covers and protects the surface of the heat collecting block 35d. For example, excessive heat energy may be applied to melt the surface of the heat collecting block 35d locally, thereby preventing the heat collecting block 35d from being damaged by the melting phenomenon. If the localized melting phenomenon occurs in the heat collecting block 35d, the auxiliary heat collecting plate 35f is naturally damaged by local melting.

Nevertheless, the reason why the auxiliary heat collecting plate 35f is applied is that the auxiliary heat collecting plate 35f is damaged instead of the heat collecting block 35d even if it is damaged. Since the auxiliary heat collecting plate 35f is very simple to replace, the auxiliary collecting plate 35f is used as a consumable.

The heat storage tube 35n is a hollow member extending in the longitudinal direction and is inserted and fixed in each receiving groove 35e. It goes without saying that the outer circumferential surface of the heat storage tube 35n is interposed on the inner circumferential surface of the receiving groove 35e.

The heat storage tube (35n) is a member having a certain diameter and extending in the longitudinal direction and having both ends clogged, and accommodates the heat storage material (35b) therein. The heat storage material 35b stores heat energy that has been drawn down through the heat collection block 35d and transfers the heat energy to the capillary tube 37a to heat the capillary tube 37a.

The capillary tube 37a has a structure in which the inside of each heat accumulating tube 35n passes in the longitudinal direction and both ends of the capillary tube 37a are bent outside the heat accumulating tube 35n. Further, as shown in FIG. 6, a plurality of heat transfer fins 37b are fixed to the capillary tube 37a. The heat conductive fins 37b are for receiving more heat energy from the heat storage material 35b.

A distribution header 38 is connected to both ends of each of the capillaries 37a. The distribution header 38 is a pipe extending in the transverse direction and connected to the induction pipe 37 described above.

The working fluid discharged from the low temperature cylinder portion 33 and raised in the direction of the arrow a flows through the right induction pipe 37 in the drawing to fill the distribution header 38 and then flows to the opposite side through the capillary tube 37a Move. That is, while passing through the heat storage tube 35n, the induction pipe 37 is moved in the direction of arrow b through the opposite side distribution header 38 in a heated state and moved to the hot cylinder part 32.

7 is a side view showing another example of the photovoltaic device 10 using the Fresnel lens according to an embodiment of the present invention, and FIG. 8 is a cross-sectional view showing the capillary bundle 47 shown in FIG. It is a perspective view.

The same reference numerals as those of the above-mentioned reference numerals indicate the same members having the same function.

The working fluid guiding means in the power generator 10 shown in Fig. 4 has a different structure from the working fluid guiding means explained with reference to Fig.

As shown in Fig. 4, the first and second induction pipes 45 and 43 may be applied as working fluid inducing means.

The first induction pipe 45 is connected to the low temperature cylinder part 33 and extends horizontally to guide the working fluid discharged from the low temperature cylinder part 33 in the horizontal direction to the solar collecting and storing part 35 ).

The second induction pipe 43 is connected to the high temperature cylinder part 32 and guides the working fluid discharged from the low temperature cylinder part 33 to the high temperature cylinder part 32. Particularly, the second induction pipe 43 is disposed outside the first induction pipe 45. It takes the form of a double tube.

The solar collecting and storing unit 35 includes a capillary bundle 47, a collecting case 41a for storing the capillary bundle 47 therein, and a heat collecting and storing unit 41a for storing heat accumulated in the collecting case 41a. Material 35b.

The capillary bundle 47 is an assembly of a plurality of capillaries 47a. 8, the capillary 47a is bended a number of times so that one end communicates with the inside of the first induction pipe 45 and the other end passes through the outer circumferential surface of the first induction pipe 45 and the second induction pipe 45, And communicates between the inner circumferential surfaces of the induction pipe (43).

The working fluid discharged through the interior of the second induction pipe 43 flows into the space between the second induction pipe 43 and the first induction pipe 45 through the capillary tube 47a and flows into the high temperature cylinder portion 32). It goes without saying that the working fluid is heated by receiving the thermal energy applied from the Fresnel lens portion 20 while passing through the capillary 47a.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

10: power generator 20: Fresnel lens 21: lens frame
21a: Lens mounting hole 21b: Supporting jaw 22: Fresnel lens
31: Stirling engine 32: High temperature cylinder part 32a: Cylinder
32b: piston 32c: connecting rod 33: low temperature cylinder part
33a: cylinder 33b: piston 33c: connecting rod
34: heat exchanging part 35: solar collecting and storing part 35a: heat collecting case
35b: heat storage material 35c: capillary plate 35d: heat collecting block
35e: receiving groove 35f: auxiliary heat collecting plate 35k, 35m: induction furnace
35n: heat storage tube 35p: capillary tube 37: induction pipe
37a: capillary tube 37b: heating pin 38: distribution header
39: output shaft 41a: heat collecting case 43: second induction pipe
45: first induction pipe 47: capillary tube bundle 47a: capillary tube
50:

Claims (7)

And a working fluid guiding means provided between the high temperature cylinder portion and the low temperature cylinder portion for guiding a working fluid sealingly accommodated in the high temperature cylinder portion and the low temperature cylinder portion and for causing the working fluid to reciprocate between the high temperature cylinder portion and the low temperature cylinder portion, A Stirling engine having an output shaft for rotating the high-temperature cylinder part and the low-temperature cylinder part while rotating axially and transmitting a rotational force to the outside;
A generator connected to the output shaft of the Stirling engine and generating power by receiving a rotational force of an output shaft;
A solar collecting and storing part for applying solar energy delivered from outside to the working fluid to cause the working fluid to move to the hot cylinder part in a heated state;
And a Fresnel lens unit for transmitting solar energy to the solar collecting and storing unit to heat the working fluid.
The method according to claim 1,
Wherein the Fresnel lens unit comprises:
A lens frame in which a plurality of lens mounting holes are formed,
And a plurality of Fresnel lenses mounted on the respective lens mounting holes of the lens frame and passing sunlight to form a plurality of optical focuses on the solar collector and the heat storage unit. Photovoltaic devices.
3. The method according to claim 1 or 2,
The solar collecting and storing part comprises:
A heat collecting case heated by receiving solar energy from the Fresnel lens,
A capillary plate disposed inside the heat collecting case and having a plurality of capillaries for passing the working fluid therethrough;
And a heat storage material that is filled in the heat collecting case and heats the capillary plate while surrounding the capillary plate and stores solar energy by itself.
3. The method according to claim 1 or 2,
The solar collecting and storing part comprises:
A heat collecting block heated by heat energy transmitted from the Fresnel lens portion,
A plurality of heat storage tubes extending in the lengthwise direction of the heat collecting block to receive the heat storage material therein,
And a plurality of capillaries which are embedded in the heat storage tubes and both ends thereof extend to the outside of the heat storage tube and allow the working fluid to pass therethrough and to be heated. .
3. The method according to claim 1 or 2,
The working fluid guiding means comprising:
A first induction pipe extending in the longitudinal direction and having one end communicating with the low temperature cylinder part and guiding the working fluid flowing out from the low temperature cylinder part into the inside thereof,
And a second induction pipe extending in the longitudinal direction and having one end communicating with the high temperature cylinder part and guiding the working fluid flowing into the high temperature cylinder into the inside thereof,
The solar collecting and storing part comprises:
A plurality of capillaries connecting the extension ends of the first induction pipe and the second induction pipe and guiding the working fluid flowing through the first induction pipe to the second induction pipe through the inside thereof,
A heat collecting case which receives the capillary and is heated by receiving solar energy from the Fresnel lens,
And a heat storage material filled in the heat collecting case so as to surround the capillary tube and transferring the solar heat energy transferred from the heat collecting case to the capillary tube and storing heat therein. .
6. The method according to any one of claims 3 to 5,
Wherein the heat storage material is a phase change material (pcm).
The method according to claim 1,
In the Stirling engine,
Wherein the solar power generator is driven by a heat source supplied from the solar collecting and storing part during a sunset time at the sunrise and generates electricity using another heat source in a weather environment in which time and solar heat can not be collected after sunset, .

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