KR102676026B1 - A Solar-collecting apparatus with increased heat exchange efficiency - Google Patents

Abstract

The present invention relates to a solar energy collection device with increased heat exchange efficiency, and more specifically, to a solar energy collection device with increased heat exchange efficiency through a fluid control unit formed inside a solar energy collection tube.

Description

A solar-collecting apparatus with increased heat exchange efficiency}

The present invention relates to a solar energy collection device with increased heat exchange efficiency, and more specifically, to a solar energy collection device with increased heat exchange efficiency through a fluid control unit formed inside a solar energy collection tube.

Recently, due to the dependence on limited resources such as electricity, gas, and oil, the price of crude oil has soared and the problem of environmental pollution has become a serious issue due to the increase in greenhouse gases due to the use of oil energy. Accordingly, many attempts are being made to develop alternative energy using nature, such as solar power, wind power, and tidal power, which do not cause environmental pollution and can be used in an eco-friendly way indefinitely.

In particular, the development of devices for producing thermal energy needed for hot water or heating water used in homes and industries using solar energy is actively underway. A solar collector is a device that allows radiant energy from the sun to be used in daily life. It generally consists of a solar collector that collects solar heat and a heat storage device that performs heat exchange by circulating thermal fluid through the collector. A solar boiler is an example of a device that uses solar energy. This solar boiler is a device that circulates heat fluid through the heat collection device to heat it and supplies the heated heat fluid to the heat storage device to achieve heating through heat exchange with water.

These solar collectors are divided into a concentrating type that collects solar heat and a non-concentrating type depending on whether or not the solar heat is collected. The non-concentrating type is divided into flat type and vacuum glass tube type, and the concentrating type is divided into PTC (Parabolic Trough Concentrator) type, CPC (Compound Parabolic Concentrator), parabolic dish type, etc. depending on the geometric structure of the concentrator (reflector). are distinguished. Among condensing types, a PTC type concentrator that can achieve a mid-to-high temperature range and can track one or two axes is the most desirable. A typical PTC concentrator uses a thin plate-shaped metal reflector to have a two-dimensional parabolic curvature. By bending, the focal point forms a strip shape, and a collection tube through which the heat medium circulates is located on this focal axis.

On the other hand, since the concentrating tube of the PTC type concentrator is in the form of a tube, there is a problem in that heat flux imbalance is caused and thermal efficiency is reduced. Accordingly, there is a demand for technology to increase heat exchange efficiency by controlling the flow of thermal fluid.

As a prior art, Korean Patent Publication No. 10-1103591 describes “a collector capable of maintaining reflectivity and reducing heat loss.”

Therefore, the present invention was proposed to improve such conventional problems, and its purpose is to provide a solar energy collection device with increased heat exchange efficiency through a fluid control unit formed inside a solar energy collection tube.

In order to solve the above problem, the solar collector with increased heat exchange efficiency according to the first embodiment of the present invention is formed to have a heat collection tube in which heat fluid flows and is curved in a parabolic shape, and the heat collection tube is It includes a reflector that collects heat and heats the thermal fluid, and the heat collection tube is formed along the longitudinal direction of the inner circumferential surface and may include a fluid control portion formed in a convex spiral shape.

In addition, the fluid control unit is disconnected to have a separation distance along the longitudinal direction to prevent damage to the heat collection tube due to large temperature changes.

Additionally, the fluid control unit may include a plurality of depressions formed along the longitudinal direction on the outer surface to increase heat exchange efficiency.

In addition, the heat collecting tube is characterized in that the diameter of the inner peripheral surface narrows along the direction of travel of the thermal fluid in order to increase the discharge speed of the thermal fluid.

In addition, the solar energy collection device with increased heat exchange efficiency according to the second embodiment of the present invention may further include a collection lens unit located on the upper side of the heat collection tube to collect sunlight.

In addition, the solar heat collection device with improved heat exchange efficiency according to the third embodiment of the present invention may further include a heat collection expansion part that improves the heat collection efficiency of the heat collection tube by rotating the reflector in the left and right directions.

In addition, the heat collecting expansion part includes a toothed plate formed along the circumference of the lower surface of the reflector and having a toothed protrusion formed at the lower end. It may include a motor provided with a gear wheel formed to engage with the gear protrusion, and a motor control unit that drives and controls the motor to rotate the reflector in the left and right directions.

The solar energy collection device with improved heat exchange efficiency according to an embodiment of the present invention can increase heat exchange efficiency through a fluid control unit formed inside the solar energy collection tube.

Additionally, since the fluid control unit is disconnected, it is possible to prevent the heat collection tube from being damaged by large temperature changes.

Additionally, heat exchange efficiency can be increased through the depression.

In addition, the diameter of the inner peripheral surface of the heat collecting tube is formed to be narrow, so that the discharge rate of the thermal fluid can be increased.

Additionally, the amount of heat collection can be increased through the collection lens unit.

Additionally, the heat collection efficiency of the heat collection tube can be improved through the heat collection expansion part.

In addition, the effects according to the embodiments of the present invention mentioned above are not limited to the contents described, and may further include all effects predictable from the specification and drawings.

Figure 1 is a perspective view showing a solar tube collector with improved heat exchange efficiency according to a first embodiment of the present invention.
Figure 2 is a perspective view showing the heat collecting tube of Figure 1.
Figure 3 is a perspective view showing the heat collecting tube of Figure 1 disconnected.
Figure 4 is an enlarged view showing a depression formed in the fluid control unit of Figure 1.
Figure 5 is a partial cross-sectional view showing another form of the heat collecting tube of Figure 1.
Figure 6 is a perspective view showing a solar tube collector with improved heat exchange efficiency according to a second embodiment of the present invention.
FIG. 7 is a cross-sectional view excluding some of the components of FIG. 6.
Figure 8 is a perspective view showing a solar tube collector with improved heat exchange efficiency according to a third embodiment of the present invention.
Figure 9 is a bottom perspective view excluding some components from Figure 8.
Figures 10 and 11 are diagrams illustrating the operation of the heat collection expansion unit of Figure 8.

Hereinafter, the description of the present invention with reference to the drawings is not limited to specific embodiments, and various changes may be made and various embodiments may be possible. In addition, the content described below should be understood to include all conversions, equivalents, and substitutes included in the spirit and technical scope of the present invention.

In the following description, the terms first, second, etc. are terms used to describe various components, and their meaning is not limited, and is used only for the purpose of distinguishing one component from other components.

Like reference numerals used throughout this specification refer to like elements.

As used herein, singular expressions include plural expressions, unless the context clearly dictates otherwise. In addition, terms such as “comprise,” “provide,” or “have” used below are intended to designate the presence of features, numbers, steps, operations, components, parts, or a combination thereof described in the specification. It should be construed and understood as not precluding the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying FIGS. 1 to 11.

In addition, in the following description, unless otherwise specified, the direction facing the front with respect to Figure 1 is referred to as 'front', and the opposite direction is referred to as 'rear'. Accordingly, terms indicating directions such as 'left', 'right', 'upward' and 'downward' are defined as indicating respective directions based on the front and rear.

Figure 1 is a perspective view showing a solar tube collector with improved heat exchange efficiency according to the first embodiment of the present invention, Figure 2 is a perspective view showing the heat collection tube of Figure 1, and Figure 3 is a disconnected view of the heat collection tube of Figure 1. It is a perspective view showing, Figure 4 is an enlarged view showing a depression formed in the fluid control part of Figure 1, and Figure 5 is a partial cross-sectional view showing another form of the heat collecting tube of Figure 1.

Referring to Figures 1 to 5, the solar energy collection device (1) with increased heat exchange efficiency of the present invention includes a collection tube (10), a reflector (20), a support frame (30), an inlet pipe (40), and an discharge pipe (50). ), a pump 60, a storage tank 70, and a heat storage device (not shown).

First, the role of the heat collecting tube 10 will be briefly explained and then explained in detail below. The heat collecting tube 10 can heat the thermal fluid inside by receiving heat from sunlight.

Here, the thermal fluid flows from the inflow pipe 40 side to the discharge pipe 50 side inside the collecting tube 10, and may be a heat transfer medium capable of absorbing heat from the collecting tube 10 and transferring it to another member. there is. It is preferable to use a nanofluid containing nanomaterials with high solar energy collection efficiency as the thermal fluid, but it is not limited to this and any thermal fluid material used in the technical field of the present invention can be used. Here, the nanomaterial may include at least one selected from carbon-based nanostructures, metals, metal compounds, non-metal compounds, or combinations thereof.

The reflector 20 is formed to have a parabolic curvature so as to collect sunlight into the collecting tube 10, and can collect sunlight into the collecting tube 10 and heat the thermal fluid. The reflector 20 may be made of a material that has high light reflectance and whose physical properties do not change depending on the temperature of solar collection.

The reflector 20 has a reflecting hole 21 formed in a straight line along the longitudinal direction at the center to prevent corrosion caused by precipitation and foreign substances from being caught. Since the reflector 20 has a parabolic structure with narrow upper and lower beams, precipitation such as rain and snow and foreign substances can move to the center of the reflector 20 along the curved surface. At this time, rainwater or snow may accumulate in the central portion of the reflector 20, which may cause corrosion, and foreign substances may accumulate and reduce solar reflectance. The reflecting hole 21 discharges water or foreign matter that collects in the center of the reflector 20 to the lower side, thereby preventing corrosion caused by precipitation and foreign matter from being caught.

The support frame 30 is configured to support the heat collecting tube 10 and the reflector 20, and may be formed as a pair in the front-back direction with the heat collection tube 10 and the reflector 20 sandwiched between them. The upper side of the support frame 30 may be formed so that the inflow pipe 40, the collection tube 10, and the discharge pipe 50 are aligned and connected to each other, and the middle portion is formed so that the front and rear sides of the reflector 20 are fixed. It can be.

The inflow pipe 40 is a pipe that introduces thermal fluid into the collecting tube 10, and the discharge pipe 50 is a pipe that receives the heated thermal fluid from the collecting tube 10. At this time, the discharge pipe 50 is preferably formed of a material that does not deform even at high temperatures of the thermal fluid.

The pump 60 is a device that supplies thermal fluid to the collecting tube 10, and can be connected to the inlet pipe 40 and driven. The storage tank 70 is a tank that accommodates thermal fluid.

A heat storage device is a device that receives heated thermal fluid and performs heating through heat exchange with hot water. Any heat storage device used in the technical field of the present invention can be used.

In addition, the thermal storage device can be used by changing its structure to a power generation device consisting of a turbine that generates electricity by utilizing the heat of the thermal fluid and a capacitor that charges electricity through the operation of the turbine.

In this way, the solar tube collector (1) with increased heat exchange efficiency of the present invention circulates the thermal fluid through the above configuration and collects sunlight through the collector tube (10) and the reflector (20) to heat the thermal fluid. This can be used to generate hot water, heating, and power generation.

From now on, the heat collecting tube 10 will be described in detail with reference to the drawings. The heat collecting tube 10 may be formed in a tube shape so that thermal fluid can be accommodated and flow therein. The heat collection tube 10 may be formed to have a vertical distance from the center of the reflector 20 and be located at the parabolic focus of the reflector 20. The heat collection tube 10 is located at the parabolic focus of the reflector 20 and absorbs sunlight collected at the parabolic focus of the reflector 20 to effectively heat the thermal fluid moving inside.

The heat collecting tube 10 is made of a material with excellent heat transfer efficiency and excellent heat resistance, and may be made of any one of copper, aluminum, and stainless steel. However, it is not limited to this.

The heat collection tube 10 may include a fluid control unit 11 therein to allow thermal fluid to flow in a vortex shape and improve heat exchange efficiency.

The fluid control unit 11 is formed along the longitudinal direction of the inner peripheral surface of the heat collection tube 10, and may be formed in a convex spiral shape. The fluid control unit 11 has a gentle slope at the end, so that when thermal fluid flows in, it can flow into the collecting tube 10 without resistance.

The fluid control unit 11 may be made of the same material as the heat collection tube 10 or a material with higher heat transfer efficiency to ensure good transfer of heat to the thermal fluid.

Additionally, referring to FIG. 3, the fluid control unit 11 may be disconnected to have a separation distance D along the longitudinal direction. Accordingly, the fluid control unit 11 can prevent the heat collecting tube 10 from being damaged due to large temperature changes.

Specifically, in the summer when the sun is long, excessive heat is collected in the collecting tube 10, which may cause the collecting tube 10 and the fluid control unit 11 to expand, and depending on the low ambient temperature in fall and winter, the collecting tube 10 ) and the fluid control unit 11 can contract. This contraction and expansion of the collecting tube 10 and the fluid control unit 11 may cause damage to the collecting tube 10. Accordingly, the fluid control unit 11 of the present invention is formed to be disconnected at regular intervals, but can form a separation distance D such that each fluid control unit 11 does not contact even if the fluid control unit 11 expands.

Additionally, referring to FIG. 4, the fluid control unit 11 may include a recessed portion 110 to increase heat exchange efficiency. A plurality of depressions 110 may be formed on the outer surface of the fluid control unit 11 along the longitudinal direction. The depression 110 can increase heat transfer efficiency by increasing the surface area between the fluid control unit 11 and the thermal fluid. The number of depressions 110 can be varied depending on the user's needs, but is not limited to this.

Additionally, as shown in FIG. 5, the heat collecting tube 10 may be formed so that the diameter of the inner peripheral surface narrows along the direction of travel of the thermal fluid. The flow speed of the collecting tube 10 may become faster toward the rear. Accordingly, the heat collecting tube 10 can increase the discharge rate of thermal fluid. The heat collection tube 10 not only receives heat and quickly discharges the heated thermal fluid without heat loss, but also allows the thermal fluid to be heated to flow smoothly through the inlet pipe 40. Accordingly, the heat collecting tube 10 can increase the rotation rate for collecting heat fluid.

Figure 6 is a perspective view showing a solar tube collector with improved heat exchange efficiency according to a second embodiment of the present invention, and Figure 7 is a cross-sectional view excluding some of the components of Figure 6.

Referring to FIGS. 6 and 7 , the solar collector 1 with improved heat exchange efficiency according to the second embodiment of the present invention may further include a collection lens unit 80.

Here, except for the collection lens unit 80, the solar energy collection device 1 with increased heat exchange efficiency according to the second embodiment of the present invention is the solar energy collection device 1 with increased heat exchange efficiency according to the first embodiment of the present invention described above. It can be said to be substantially the same as the light collecting device 1.

Therefore, only the collecting lens unit 80 will be described in detail.

The collecting lens unit 80 can collect sunlight in the collecting tube 10. For this purpose, the collection lens unit 80 may include a collection lens 81 and a lens coupling means 82.

The collecting lens 81 may be located on the upper side of the collecting tube 10 so that sunlight is collected in the lower collecting tube 10. Accordingly, the lower surface of the collecting tube 10 is collected by the reflector 20, and the upper surface is collected by the collecting lens 81, so that it is possible to collect sunlight as a whole, thereby increasing the heating of the thermal fluid flowing inside. You can.

The lens coupling means 82 is a means for coupling the collecting lens 81 to the collecting tube 10. It is connected to the collecting lens 81 on the upper side, and is coupled as if surrounding the collecting tube 10 to form the collecting tube 10. ) can be firmly fixed. The lens coupling means 82 is formed of the same material as the collecting tube 10, so that the heat transferred from the collecting lens 81 can be smoothly transferred to the collecting tube 10.

That is, the heat collection lens unit 80 collects heat from the upper side of the heat collection tube 10, so that the entire heat collection tube 10 collects heat, and the thermal fluid flowing inside the heat collection tube 10 can be effectively heated.

Figure 8 is a perspective view showing a solar tube collector with increased heat exchange efficiency according to the third embodiment of the present invention, Figure 9 is a bottom perspective view excluding some components in Figure 8, and Figures 10 and 11 are expansions of heat collection of Figure 8. This is an example of the operation of the unit.

Referring to FIGS. 8 and 11 , the solar heat collection device 1 with improved heat exchange efficiency according to the third embodiment of the present invention may further include a heat collection expansion portion 90.

Here, except for the heat collection expansion unit 90, the solar heat collection device 1 with increased heat exchange efficiency according to the third embodiment of the present invention is the solar heat collection device 1 with increased heat exchange efficiency according to the first embodiment of the present invention described above. It can be said to be substantially the same as the light collecting device 1.

Therefore, only the heat collection expansion unit 90 will be described in detail.

The heat collection expansion unit 90 can improve the heat collection efficiency of the heat collection tube 10 by rotating the reflector 20 in the left and right directions. In addition, the heat collection expansion unit 90 can rotate left and right to shake off foreign substances from the surface of the reflector 20 to prevent the reflector 20 from being contaminated.

Specifically, the reflector 20 collects sunlight on the lower side of the heat collection tube 10 to heat the thermal fluid inside. However, since sunlight is transmitted to only a portion of the reflector 20, the collection efficiency may be reduced. Additionally, the collection efficiency of the reflector 20 may be reduced if precipitation such as rainwater or snow, or foreign substances such as dust or fallen leaves accumulate. In order to solve this problem of lowering the collection efficiency of the reflector 20, the collection expansion unit 90 rotates the reflector 20 in the left and right directions to transmit sunlight not only to the lower side but also to the side and top of the collection tube 10. You can. Additionally, the heat collection expansion unit 90 can remove precipitation or foreign substances on the upper surface of the reflector 20.

For this purpose, the heat collection expansion unit 90 may include a toothed plate 91, a motor 92, and a motor control unit (not shown).

The toothed plate 91 is formed along the circumference of the lower surface of the reflector 20, and a toothed protrusion 910 may be formed at the bottom. The toothed plate 91 is formed as a pair on the front and rear sides of the reflector 20 and can receive rotational force from the motor 92 to stably rotate the reflector 20.

The motor 92 is formed on the lower side of the reflector 20, and may be provided with a gear wheel 920 formed to engage with the tooth protrusion 910. The motor 92 can rotate in the forward and reverse directions, so when the gear wheel 920 rotates according to the operating direction of the motor 92, rotational force is transmitted to the tooth protrusion 910 of the engaged tooth plate 91, thereby causing the reflector 20. This can be rotated left and right. The motor 92 may be formed to be connected to the support frame 30.

In addition, the motor 92 is provided with a gear wheel 920 on the upper side, and as shown in the drawing, the gear wheels 920 may be formed to face each other. Accordingly, the pair of motors 92 can rotate the gear wheels to rotate the reflector 20 to the left or right.

The motor control unit (not shown) may drive and control the motor 92 to rotate the reflector 20 in the left and right directions. The motor control unit can use any control device that can be used in the technical field of the present invention.

Hereinafter, with reference to FIGS. 8, 10, and 11, the operation of the heat collection expansion unit 90 of the solar heat collection device 1 with improved heat exchange efficiency according to the third embodiment of the present invention will be described.

As shown in FIG. 8, when the reflector 20 is in the correct position and the motor 92 is driven to rotate the gear wheel 920 in the reverse direction (counterclockwise), as shown in FIG. 10, the gear wheel 920 rotates in the reverse direction (counterclockwise). The rotational force of 920 is transmitted to the toothed protrusion 910 of the engaged toothed plate 91, so that the reflector 20 can be rotated to the left. On the other hand, when the motor 92 is driven to rotate the gear wheel 920 in the positive direction (clockwise), as shown in FIG. 11, the rotational force of the gear wheel 920 is applied to the toothed protrusion of the gear plate 91 with which it is engaged. It is transmitted to 910 so that the reflector 20 can be rotated to the right.

As described above, the heat collection expansion unit 90 rotates the reflector 20 in the left and right directions to expand the collecting portion of the heat collection tube 10 and removes foreign substances that may accumulate on the upper surface of the reflector 20, thereby increasing the heat collection efficiency. can be improved.

Although embodiments of the present invention have been described above with reference to the attached drawings, those skilled in the art can realize that the present invention can be implemented in other specific forms without changing the technical idea or essential features of the present invention. You will be able to understand it. Therefore, the embodiments described above are illustrative in all respects and are not restrictive.

1: Solar energy collection device with increased heat exchange efficiency
10: collecting tube
11: Fluid control unit
110: depression
20: reflector
21: reflection hole
30: support frame
40: inlet pipe
50: discharge pipe
60: pump
70: storage tank
80: collecting lens unit
81: collecting lens
82: Lens coupling means
90: Collection expansion unit
91: toothed plate
910: sawtooth protrusion
92: motor
920: gear wheel
D: Separation distance

Claims (7)

A heat collecting tube in which thermal fluid flows and
It is formed to have a parabolic curvature, and includes a reflector that collects heat in the heat collection tube and heats the heat fluid,
The collecting tube is,
It is formed along the longitudinal direction of the inner peripheral surface and includes a fluid control part formed in a convex spiral shape,
The reflector is,
A straight line is formed along the longitudinal direction at the center of the reflector to prevent corrosion of the reflector or a decrease in solar reflectance due to precipitation and foreign substances that gather in the center of the reflector along the curved surface formed on the reflector. a reflecting hole that allows stagnant or accumulated precipitation and foreign substances to be discharged to the lower side of the reflector;
A solar collector with increased heat exchange efficiency, including.
According to paragraph 1,
The fluid control unit,
A solar energy collection device with increased heat exchange efficiency, characterized in that it is disconnected so that there is a separation distance along the longitudinal direction to prevent the heat collection tube from being damaged by large temperature changes.
According to paragraph 1,
The fluid control unit,
A solar collector with increased heat exchange efficiency that includes a plurality of depressions formed along the length of the outer surface to increase heat exchange efficiency.
According to paragraph 1,
The collecting tube is,
A solar collector with increased heat exchange efficiency, characterized in that the diameter of the inner peripheral surface narrows along the direction of travel of the thermal fluid in order to increase the discharge speed of the thermal fluid.
According to paragraph 1,
The solar collector with increased heat exchange efficiency,
A solar energy collection device with improved heat exchange efficiency, further comprising a collection lens unit located on the upper side of the heat collection tube to collect sunlight.
According to paragraph 1,
The solar collector with increased heat exchange efficiency,
A solar energy collection device with improved heat exchange efficiency, further comprising a heat collection expansion portion that improves the heat collection efficiency of the heat collection tube by rotating the reflector in the left and right directions.
According to clause 6,
The heat collection expansion unit,
A toothed plate formed along the circumference of the lower surface of the reflector and having a toothed protrusion formed at the bottom;
A motor provided with a gear wheel formed to engage with the tooth projection, and
A solar collector with increased heat exchange efficiency, including a motor control unit that drives and controls the motor to rotate the reflector in the left and right directions.