Patent Publication Number: US-2010116321-A1

Title: Apparatus for collecting sunlight

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an apparatus for collecting sunlight. More particularly, the present invention relates to an apparatus for collecting sunlight which includes at least two reflectors arranged to perform two reflections and allow light to be collected on a location behind the reflectors by secondary reflection, so that the collected light can be used at this location, thereby guaranteeing a sufficient light collection area and enabling various applications for power generation using sunlight. 
     2. Description of the Related Art 
     A solar collection system has functions of collecting sunlight at a high density to improve power generation efficiency as much as possible and converting solar energy into heat or electric energy. 
     Solar generation systems including solar cells and light collectors have various merits in that the systems allow easy maintenance and have a long lifespan without causing resource depletion. However, the systems entail burdens of high installation costs and provide relatively low energy efficiency. 
     The solar generation system includes a planar solar collector (low temperature type solar collector of 10° C. or less), a parabolic trough solar collector (PTC), a compound parabolic collector (medium temperature type solar collector of 300° C. or less), or a dish type parabolic solar collector (high temperature type solar collector of 300° C. or more) which has a parabolic surface. 
     Particularly, the parabolic solar collector is used to obtain high temperatures and includes a parabolic reflector that reflects light to be collected on a predetermined portion (focus) inside the reflector, where a generator is disposed for heat generation or electricity generation. 
     In the parabolic solar collector, however, the generator is disposed in front of the reflector to shield the reflector, thereby deteriorating light collection efficiency. Moreover, the size reduction of the generator entails deterioration in power generation capability. 
     SUMMARY OF THE INVENTION 
     The present invention is conceived to solve the above and other problems of the related art, and an aspect of the present invention is to provide an apparatus for collecting sunlight that includes a primary focus reflector to collect light on a location in front of the primary reflector and a secondary reflector having a smaller size than the primary reflector to transfer the collected light to a location behind the primary reflector via a through-hole formed in the primary reflector to guarantee as large a light collection area of the primary reflector as possible without deteriorating light collection efficiency. 
     In accordance with an aspect of the present invention, an apparatus for collecting sunlight includes: a light collection module, the light collection module including a primary focus reflector collecting and reflecting sunlight to a secondary parallelization reflector and having a through-hole formed at a portion thereof, and a secondary parallelization reflector disposed in front of the primary focusing reflector and reflecting the sunlight received from the primary focus reflector to a location behind the primary focus reflector through the through-hole; and a power generation module including one of a heat collector receiving the sunlight reflected by the secondary parallelization reflector and converting solar energy into thermal energy and a power generator receiving the sunlight reflected by the secondary parallelization reflector and converting the solar energy into electric energy. 
     The apparatus may further include a protective cover composed of a transparent material and mounted on a front side of the primary focus reflector to cover the primary focus reflector. 
     The apparatus may further include a tertiary-reflection module located behind the primary focus reflector to reflect and transfer the sunlight, having been transferred to the location behind the primary focus reflector through the through-hole, to the power generation module. 
     The tertiary-reflection module may include a tertiary planar reflector and a supporter supporting the tertiary planar reflector, in which the tertiary planar reflector is rotated on the supporter in a horizontal direction or pivoted upward and downward at a constant angle with respect to the horizontal direction on the supporter. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other aspects, features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments given in conjunction with the accompanying drawings, in which: 
         FIG. 1  is a diagram of an apparatus for collecting sunlight according to one embodiment of the present invention; 
         FIG. 2  is a side sectional view of reflectors of the apparatus including a protective cover according to one embodiment of the present invention; 
         FIG. 3  is a perspective view of a modification of the apparatus according to one embodiment of the present invention, in which a secondary parallelization reflector is provided to a primary focus reflector in a modified manner; 
         FIGS. 4  ( a ) and ( b ) are conceptual views illustrating multiple light collection modules associated with each other, according to one embodiment of the present invention; 
         FIG. 5  is a conceptual view illustrating various arrays of light collection modules; 
         FIG. 6  is a perspective view of a tertiary reflection module according to one embodiment of the present invention; and 
         FIG. 7  is a block diagram illustrating a principle of controlling pivot movement of a tertiary planar reflector of the tertiary reflection module according to the embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENT 
     Hereinafter, embodiments of the invention will be described in detail with reference to the accompanying drawings. It should be noted that the drawings are not to precise scale and like components will be denoted by like reference numerals throughout the drawings. 
     Referring to  FIGS. 1 and 2 , an apparatus for collecting sunlight according to one embodiment of the invention includes a light collection module  1  and a power generation module  40 . 
     The light collection module  1  collects sunlight on a predetermined location with optimal light collection efficiency. The light collection module  1  includes a primary focus reflector  10  and a secondary parallelization reflector  20 . The light collection module  1  may further include a tertiary reflection module  30 , a protective cover  15 , and a solar position tracking mechanism. 
     The power generation module  40  converts solar energy, which is collected by the light collection module  1 , into heat energy or electric energy. The power generation module  40  includes a heat collector  41 , a water tank  45 , a heat exchanger  42 , a power generator  43 , and an electric condenser  44 . 
     The light collection module  1  and the power generation module  40  will be described hereinafter in more detail in connection with various embodiments. 
     The primary focus reflector  10  may have various shapes including a spherical shape, a parabolic shape, and the like. In this embodiment, the primary focus reflector  10  has a parabolic shape. The primary focus reflector  10  primarily collects and focuses sunlight to transfer the collected light (that is, sunlight) to the secondary parallelization reflector  20 . 
     Here, an outer appearance of the primary focus reflector  10  is not a parabolic trough shape, which is well known in the art, but a solar-dish shape, as shown in  FIG. 3 . The solar-dish shaped primary focus reflector  10  may have a spherical or parabolic inner rounded surface. In this embodiment, the solar-dish shaped primary focus reflector  10  has a parabolic inner surface, considering an installation location of the secondary parallelization reflector  20  described below and light collection efficiency. 
     The primary focus reflector  10  has a through-hole  11  formed at the center thereof and having a predetermined diameter (which is not necessarily the same as that of the secondary parallelization reflector), so that light is transferred to a location behind the primary focus reflector  10  through the through-hole  11  by reflection of the secondary parallelization reflector  20 . 
     The primary focus reflector  10  may be further provided with a protrusion  11   a  behind the through-hole  11 . The protrusion  11   a  allows sunlight passing through the through-hole  11  to be more efficiently transferred to the power generation module  40  without scattered reflection. As a result, it is possible to reduce loss of light behind the primary focus reflector  10 . 
     The secondary parallelization reflector  20  is located in front of the primary focus reflector  10  to transfer the light, which has been primarily collected by the primarily, towards the through-hole  11 . 
     Here, since the secondary parallelization reflector  20  is located in front of the primary focus reflector  10 , there is a possibility of reducing the light collection efficiency by shielding sunlight directed toward the primary focus reflector  10 . Therefore, in order to minimize this problem, the size of the secondary parallelization reflector  20  may be reduced as much as possible. For example, the secondary parallelization reflector  20  may have a smaller surface area corresponding to 2˜10% of the surface area of the primary focus reflector  10 . Alternatively, the secondary parallelization reflector  20  may have a surface area of 2˜5% of the surface area of the primary focus reflector  10 . 
     The secondary parallelization reflector  20  may be secured in a suspended state by a plurality of wires  25  extending to a periphery or other suitable portions of the primary focus reflector  10 . Further, the secondary parallelization reflector  20  is configured to reflect light, which has been collected by the primary focus reflector  10 , as parallel light in order to achieve optimal efficiency in reflection and light collection. 
     The wire  25  is provided with a length adjustment mechanism  26  capable of adjusting the length of the wire  25 . A distance between the primary focus reflector  10  and the secondary parallelization reflector  20  is adjusted by the length adjustment mechanism  26 , so that the location of the secondary parallelization reflector  20  can be precisely adjusted according to the shape of the primary focus reflector  10  or the location of the through-hole  11 . 
     The length adjustment mechanism  26  can be fabricated by various manners well-known in the art. For example, two strings of wires  25  and a fastening frame  26  for fastening the wires  25  are prepared. Then, one of the wires  25  is pushed or pulled through the fastening frame  26  to have a predetermined length and is securely fixed in the fastening frame  26  by a fastener  27 . 
     As such, the secondary parallelization reflector  20  is different from that of the conventional apparatus for collecting sunlight, in which light is reflected to a location in front of the primary reflector by the primary or secondary reflector and is used at this location. That is, the secondary parallelization reflector  20  reflects light not to a location in front of the primary focus reflector  10 , but to a location behind the primary focus reflector  10 . The reasons for using the secondary parallelization reflector  20  according to this embodiment are described in brief hereinafter. 
     Firstly, since a front part of the primary focus reflector  10  constitutes a light collection section, positioning of a heat collector or a power generator on this part results in shielding the light collection section by the volume thereof, thereby deteriorating light collection efficiency. Secondly, when mounting the protective cover  15  to protect the primary focus reflector  10 , the protective cover  15  can be easily mounted on the primary focus reflector  10  with assistance from the secondary parallelization reflector  20 , thereby enabling easy installation of the protective cover. 
       FIG. 3  is a perspective view of a modification of the apparatus according to one embodiment of the invention, in which the secondary parallelization reflector is provided to the primary focus reflector in a modified manner. In this embodiment, multiple orifices are formed around the through-hole  11  and are respectively fitted onto multiple supporters  29 , each of which has a predetermined length and is disposed to extend from the front side of the primary focus reflector  10 . Further, the secondary parallelization reflector  20  has multiple orifices formed along an inner circumference thereof such that a distal end of each of the supporters  29  is fitted into the associated orifice to mount the secondary parallelization reflector  20  on the supporters  29 . 
     This arrangement of the secondary parallelization reflector  20  minimizes the problem of shielding the surface of the primary focus reflector  10  by the multiple wires, as shown in  FIG. 2 , and prevents the secondary parallelization reflector  20  from being unnecessarily moved by the elasticity of the wires, so that the secondary parallelization reflector  20  can be more securely mounted in front of the primary focus reflector  10 . 
     It should be understood that the length of the supporter  29  can be adjusted according to a focal point of the primary focus reflector  10 . Further, although not shown in the drawings, the supporter  29  may be configured to have an adjustable length as in a foldable antenna. 
     As shown in  FIG. 2 , the protective cover  15  is transparent and is disposed at a location collinear with the secondary parallelization reflector  20  (here, the secondary parallelization reflector  20  may be mounted to the protective cover or may be integrally formed therewith) or in front of the primary focus reflector  10  to protect the primary focus reflector  10  (and the secondary parallelization reflector  20 ). The protective cover  15  may be formed of a transparent material, such as glass, acryl, polycarbonate (PC), or the like, which has sufficient transparency and durability, to ensure that sunlight passes sufficiently and properly therethrough. 
     According to one embodiment of the invention, the protective cover  15  may be mounted on a parallel plane extending straightly from an outer periphery of the primary focus reflector  10  or may be formed to have a convex curvature with respect to the outer periphery thereof to sufficiently cover the primary focus reflector  10 . It should be understood that mounting the protective cover  15  on the parallel plane extending straightly from the outer periphery of the primary focus reflector  10  is more advantageous to prevent collection of sunlight on the focal point from being obstructed by unnecessary refraction. 
     The protective cover  15  serves to prevent deterioration of light collection efficiency or durability of the primary focus reflector  10  exposed to the outside, which can occur due to contamination by foreign matter according to climate and season. 
     Further, the surface of the protective cover  15  may be subjected to waterproofing treatment to ensure easy cleaning of the protective cover using water. Additionally, the surface of the protective cover  15  may be subjected to hard-coating treatment to minimize scratches due to friction or impact. Moreover, the surface of the protective cover  15  may be subjected to photocatalyst coating treatment using TiO 2  materials (photocatalyst material) which can decompose foreign matter such as organic materials and the like through reaction with sunlight. 
     Use of the protective cover  15  can guarantee light collection efficiency of the primary focus reflector  10  by a convenient cleaning operation, and enables enhancement in durability by permitting dust or foreign matter to be easily removed even by rain or the like. 
     Light transferred to a location behind the primary focus reflector  10  by the secondary parallelization reflector  20  may be directly used for heat collection or power generation by the power generation module  40 . The apparatus may further include the tertiary reflection module  30  behind the primary focus reflector  10 . 
     According to the embodiment of the invention, the light collection module  1  may be realized to have a small size of 300×300 or 700×700 mm. The small size of the light collection module  1  allows not only a reduction in manufacturing costs of the respective reflectors, but also a decrease in focal distances of the respective reflectors and a reduction in overall volume of the apparatus, thereby providing making the apparatus applicable to a variety of geographic regions. Additionally, the small size of the light collection module  1  allows multiple light collection modules to be arranged in a variety of matrices to ensure superior light collection capability and more flexible arrangement of the light collection modules while providing convenience of control. 
     Thus, when the apparatus includes an array of light collection modules  1 , it may be attempted to increase the light collection efficiency as much as possible by re-collecting light, which has been collected by the individual light collection modules  1 . 
     To achieve such an attempt, the tertiary reflection module  30  includes a tertiary planar reflector  31  and a supporter  33 . The tertiary reflection module  30  serves to maximize solar energy generation by redirecting light, which has been transferred to the location behind the primary focus reflector  10  via the through-hole  11  of the primary focus reflector  10  by the secondary parallelization reflector  20  in each of the multiple light collection modules  1 , towards the power generation module  40 . 
       FIGS. 4  ( a ) and ( b ) are conceptual views illustrating multiple light collection modules associated with each other, according to one embodiment of the present invention, and  FIGS. 5  ( a ) to ( d ) are conceptual views illustrating various arrays of the light collection modules. 
       FIG. 4(   a ) illustrates a 1×7-array of light collection modules  1 , and  FIG. 4(   b ) illustrates a 3×3-array of light collection modules  1 . 
     Referring to  FIGS. 1 and 4 , in the tertiary reflection module  30 , the tertiary planar reflector  31  is pivotally supported on the supporter  33  and reflects light, which has reached the location behind the primary focus reflectors  10  via the through-hole  11  of the primary focus reflectors  10  by reflection of the secondary parallelization reflectors  20 , towards the power generation module  40  such that the light is finally collected into the power generation module  40 , for example, the heat collector. 
     In the tertiary reflection module  30 , the tertiary planar reflector  31  may have a variety of reflection angles set according to the position and size of the power generation module  40 . In this regard, it should be noted that light reflected by the tertiary planar reflector  31  is necessarily directed towards the power generation module  40 . 
     Although the tertiary reflection module  30  is described as being provided for the multiple light collection modules  1  in this embodiment, it may also be provided for the apparatus including a single light collection module  1 . On the other hand, although it may also be conceived to dispose a fourth or fifth planar reflector for transferring light to another location, three reflectors, that is, the primary to tertiary reflectors as described above, may be sufficient to prevent deterioration of light collection efficiency caused by frequent reflection. 
     Referring to  FIG. 5 , according to the embodiment of the invention, the number and arrangement of unit light collection modules  1  may be determined, as needed, according to circumstances and requirements of installation sites. For example, the light collection modules  1  may be arranged in a quadrangle array of 2×2, 3×3, 4×4, or the like, or in a parallelepiped array of 1×7 or the like. 
     Each of the light collection modules  1  includes a connection member to connect with other light collection units  1 . Examples of the connection member include a bracket, a groove/protrusion configuration for tongue-and-groove coupling, and the like. 
     In other words, the light collection module  1  according to the embodiment of the invention permits application of a module assembly manner, thereby enabling improvement in installation and assembly efficiency, mass production, and reduction in manufacturing costs. 
     As clearly shown in  FIG. 6 , in the tertiary reflection module  30  according to the embodiment, the tertiary planar reflector  31  is pivotally supported on the supporter  33 , which has a predetermined length. 
     Particularly, the tertiary planar reflector  31  is connected to the supporter  33  via a horizontal pivot part  32 , which can act as a horizontal shaft for upward-downward pivot movement of the tertiary planar reflector  31  on the support  33 , and a vertical pivot part  34 , which can act as a vertical shaft for horizontal rotation of the tertiary planar reflector  31  on the support  33 , so that the tertiary planar reflector  31  can be varied in installation angle with respect to the horizontal direction and can be rotated at a predetermined angle in the vertical direction. 
     In other words, the tertiary planar reflector  31  is connected to an upper part of the supporter  33  via brackets  32   a  disposed at opposite sides of a lower part of the tertiary planar reflector  31 , and is connected to the horizontal pivot part  32  disposed inside the brackets  32   a  by a connection part  36 , which extends a predetermined length from the lower part of the tertiary planar reflector  31  into the brackets  32   a  although not shown in the drawings. 
     The horizontal pivot part  32  appears similar to a well-known hinge that extends in the horizontal direction. However, according to one embodiment of the invention, the horizontal pivot part  32  is provided with a stopper at a portion thereof connected to the brackets  32   a  so as to be pivoted not by natural force but only by a drive motor, and may be configured to increase a frictional coefficient. For example, a fine protrusion may be formed around the brackets and a groove corresponding to the protrusion may be formed around the horizontal pivot part for tongue-and-groove coupling. This configuration is provided to prevent the tertiary planar reflector  31  from being easily rotated by natural forces such as wind or the like, thereby preventing obstruction in light collection into the power generation module  40 . 
     Although not shown in the drawings, the horizontal pivot part  32  is connected to a drive motor, for example, a stepper motor for precise rotation control, and is pivoted by the drive motor, so that the tertiary planar reflector  31  connected to the horizontal pivot part  32  can be pivoted at a constant angle with respect to the horizontal direction. 
     Further, the horizontal pivot part  32  is connected at one side thereof to the vertical pivot part  34 , which extends in the vertical direction and is parallel to an inner space of the supporter  33 . The vertical pivot part  34  is dispose in the supporter  33  and is connected to a separate motor  35 . Thus, the vertical pivot part  34  can be rotated at a constant angle with respect to the horizontal direction by the motor  35 . 
     With this configuration, the tertiary planar reflector  31  can theoretically be rotated 360 degrees with respect to a planar surface by rotation of the vertical pivot part  34 . 
     Here, the horizontal pivot part  32  and the vertical pivot part  34  may be implemented by well-known mechanical components, such as universal joints. Specifically, as shown in  FIG. 6 , the horizontal pivot part  32  is provided between the connection part  36  and the vertical pivot part  34  and is connected to a separate drive motor capable of directly transmitting a rotational force to the horizontal pivot part  32  to obtain the pivot movement of the horizontal pivot part  32 . For example, the horizontal pivot part  32  is connected to the drive motor via a separate shaft or is provided at one side thereof with a gear such that a power transmission gear contacting the gear can be rotated by the drive motor. Further, the vertical pivot part  34  may also be rotated by a separate motor  35  which is located at a lower end of the vertical pivot part  34 . The connection part  36  is connected to a lower surface of the tertiary planar reflector  31  to pivot the tertiary planar reflector  31  in the horizontal or upward-downward direction by horizontal or upward-downward pivoting of the connection part  36 . 
     As such, the horizontal or upward-downward pivoting of the tertiary reflector  31  serves to transfer sunlight, which has been collected in the light collection module  1 , to the power generation module  40  with convenience and efficiency, corresponding to the Sun&#39;s path which continuously changes. 
       FIG. 7  is a block diagram illustrating a principle of controlling pivot movement of the tertiary planar reflector of the tertiary reflection module according to the embodiment of the invention. 
     As described above, the tertiary planar reflector  31  is required to change an angle on the supporter by tracing the Sun&#39;s path, which changes from the morning to the evening or according to seasons. Furthermore, when the multiple light collection modules  1  are used for light collection into a single power generation module  40  as shown in  FIG. 4 , it is necessary to accomplish precise adjustment of each disposition angle of the plural tertiary planar reflectors  31 . 
     In order to achieve precise control of the disposition angle of the tertiary planar reflector  31 , the tertiary reflection module  30  according to this embodiment further includes a controller  131 , a first angle adjustment module  134 , and a second angle adjustment module  135 . The controller  131  includes a solar position tracking mechanism  132  and a look-up table  133 . 
     The controller  131  sends drive signals to the first and second angle adjustment modules  134 ,  135  to adjust rotation degrees of the drive motor and the motor  35  connected to the horizontal and vertical pivot parts  32 ,  34 , respectively. To this end, the controller  131  includes the solar position tracking mechanism  132 , which can trace the position of the Sun and can convert information of a specific position of the Sun into numerical data, as known in the art. Further, the look-up table  133  of the controller  131  has a database obtained by previously calculating horizontal pivot angles and/or vertical pivot angles of the tertiary planar reflectors  31  for light collection into the power generation module  40  according to a numerical value (position value) of a specific position of the Sun, when a predetermined number of tertiary planar reflectors  31  is provided. 
     For example, when 1×7 tertiary reflection modules  30  are linearly arranged, the controller  131  sets serial numbers of the respective reflection modules  30  and extracts disposition angles of the tertiary planar reflectors  31  as drive signals from the look-up table  133 , which will be taken by the tertiary planar reflectors  31  in the respective tertiary reflection modules  30  at a specific position of the Sun. Here, the specific position of the Sun is given as a predeteimined numerical value indicating the position of the Sun by the solar position tracking mechanism  132 . Then, the controller  131  sends the drive signals to the corresponding tertiary planar reflectors  31 . The drive signals have different values since the multiple tertiary planar reflectors  31  have different disposition angles according to arrangement of multiple tertiary planar reflectors  31 , a distance therebetween, or the like. 
     The drive signals may be divided into a horizontal drive signal for rotation of the horizontal pivot part  32  and a vertical drive signal for rotation of the vertical pivot part  34 . 
     The first angle adjustment module  134  receives the horizontal drive signal from the controller  131  to adjust a rotation degree of the drive motor connected to the horizontal pivot part  34 , and the second angle adjustment module  135  receives the vertical drive signal from the controller  131  to adjust a rotation degree of the motor  35  connected to the vertical pivot part  35 . 
     With this configuration, the tertiary planar reflector  31  can transfer sunlight, which has been collected in the light collection module  1 , to the power generation module  40  with more precision and efficiency corresponding to the position of the Sun or the arrangement of the tertiary planar reflectors  31 . 
     Since a conventional reflector has a mirror surface formed by grinding the surface of glass or metal, the conventional reflector is heavy and likely to be damaged. To overcome such problems of the conventional reflector, the primary focus reflector  10  and the secondary parallelization reflector  20  may be formed of polymer resins, thereby reducing the weight of the reflector, the possibility of damage, and manufacturing costs. It should be understood that the tertiary planar reflector  31  may also be formed of the polymer resins for the same reasons. 
     One example of the polymer resin for the reflectors according to this embodiment includes polybutylene terephthalate, which is a light and durable material and permits mass production through injection molding. Alternatively, a material comprising 30% by weight of glass fibers and a mixture of PC and ABS as a base material may be used to improve heat resistance during surface coating at high temperatures. 
     Additionally, the reflectors  10 ,  20 ,  31  may be subjected to metal coating treatment in order to maximize reflection efficiency. 
     Specifically, when performing the metal coating on the surfaces of the reflectors  10 ,  20 ,  31 , chromium (Cr) or aluminum (Al) having a high reflection coefficient is coated to a thickness of 1˜100 μm on the surfaces of the reflectors  10 ,  20 ,  31 , followed by coating SiO 2  to a thickness of 10˜50 μm on the Cr or Al coating to form a protective coating film thereon, thereby providing superior reflection efficiency. 
     According to the embodiment, the light collection module  1  includes the solar position tracking mechanism to control the orientation of the light collection module  1  according to the position of the Sun. The solar position tracking mechanism is well known in the art (see, for example, Korean Patent No. 343263, Korean Patent No. 836870, and the like), and thus, a detailed description thereof will be omitted herein. 
     Referring again to  FIG. 1 , the power generation module  1  functions like a well-known system that converts sunlight collected by a general sunlight collection module into thermal energy or electric energy. 
     In other words, the power generation module  40  receives light converged by the secondary parallelization reflector ( 20 ) (or the tertiary planar reflector  31 ) and uses the light to heat water or generate electric energy. 
     For example, the heat collector  41  has a function of collecting heat from light, and the heat exchanger  42  serves to directly warm cold water sent from the water tank  45 . 
     Further, although the power generator  43  is connected to the heat exchanger  42  and the water tank  42 , the power generator  43  has a main function of converting sunlight into electric energy. The electric condenser  44  serves to condense electricity generated by the power generator  43 . 
     Here, the heat collector  41  may be formed of a metallic material such as aluminum, SUS or copper, and includes a heat medium for effectively converting sunlight into a heat source. The heat medium may be composed of tin, lead, salt, and other materials well-known in the art. 
     The surface of the heat collector  41  may be subjected to sand blasting to increase the surface area of the heat collector  41 , and may be further subjected to coating with black paint or plating with black chrome (to a thickness of about 1˜50 μm) to increase heat absorption efficiency. 
     The surface of the heat collector  41  may be further provided with an aero-gel to effectively shield heat loss to the outside. 
     Although not shown in the drawings, the aero-gel is formed on the surface of the heat collector  41  and contains gaseous molecules in a housing composed of various materials, for example, silicon nano-structures, thereby ensuring heat insulation effects superior to existing heat insulators. 
     The power generation module  40  has various applications. Particularly, since the power generation module  40  is located behind the primary focus reflector  10 , the power generation module can be actively applied to a wider variety of applications without being restricted by the volume or the formation method thereof. 
     According to one embodiment of the invention, the apparatus includes a power generation module located behind reflectors to use light, thereby improving light collection and power generation efficiency while enabling various modifications in size and shape of the power generation module. 
     Further, according to one embodiment of the invention, the apparatus is provided with multiple light collection modules, each of which can collect and transfer light, having been reflected to a location behind the reflectors, to the power generation module, thereby enabling convenient adjustment of a light collection amount as needed, while allowing various arrangements and adjustment of the number of light collection modules. 
     Further, according to one embodiment of the invention, the reflectors of the apparatus are protected, thereby improving durability of the apparatus. 
     Further, according to one embodiment of the invention, the reflectors and the protective cover are subjected to specific surface treatment, thereby improving light collection efficiency and durability of the apparatus. 
     Moreover, according to one embodiment of the invention, the apparatus includes a tertiary reflector configured to be automatically adjusted in location according to a position of the Sun. 
     Although some embodiment have been provided to illustrate the invention in conjunction with the drawings, it will be apparent to those skilled in the art that the embodiments are given by way of illustration only, and that various modifications and changes can be made without departing from the spirit and scope of the invention as defined by the accompanying claims.