• 专利附录
  • 专利说明
  • 权利要求
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    • 专利摘要:
    Thermosolar parametric cylinder hybrid system (14) and photovoltaic receiver (3), comprising a thermal absorber receiver (2) through which a heat-carrying fluid circulates, and, in addition, at least one spectral separation filter (4), located between the photovoltaic receiver (3) and the thermal absorber receiver (2), which receives the light reflected from the primary mirror (1) of the parametric cylinder and allows the selective separation of the solar spectrum, directing a part of it towards the photovoltaic receiver ( 3) and the rest towards the thermal absorber receiver (2). (Machine-translation by Google Translate, not legally binding)
    公开号:ES2539511A1
    申请号:ES201331946
    申请日:2013-12-31
    公开日:2015-07-01
    发明作者:Pablo Noriega Gil；Sebastián CAPARRÓS JIMÉNEZ；Fernando Jesús CASTAÑO SÁNCHEZ；Juan Pablo Nuñez Bootello；Antonio De Dios Pardo；Keith Boyle
    申请人:Abengoa Solar New Technologies SA；
    IPC主号:
    专利说明:

    P201331946
    12-31-2013
    DESCRIPTION Parametric thermosolar cylinder and photovoltaic receiver hybrid system
    5 FIELD OF THE INVENTION
    The present invention relates to a hybrid system of parametric cylinder thermosolar receivers and photovoltaic receivers in an integrated solar concentration system. 10 BACKGROUND OF THE INVENTION
    Within the solar concentration technology, two large blocks can be distinguished: solar thermal concentration and photovoltaic solar concentration.
    15 The principle of operation of both are based on the same concept: using an optical system that concentrates the light. Said concentrated light can be directed to heat a fluid that enters a turbine cycle, in case of thermal, or directly generate electricity via photoelectric effect in a semiconductor, in the case of photovoltaics.
    20 Photovoltaic concentration technology consists of concentrating levels of solar radiation on cells of a very small size. The use of an optical element of much lower cost to concentrate the incident light allows the use of solar cells of greater efficiency (and generally of greater cost). These systems can potentially be more
    25 cost competitive than conventional photovoltaic systems by replacing much of the semiconductor area with standard optical elements such as lenses or mirrors, in addition to being more efficient.
    The combination of reflective and refractive elements results in a wide variety of systems.
    30 themes of solar concentration. However, in most photovoltaic concentration systems, fresnel lenses with secondary concentration elements, double mirror systems with light homogenizers or CPC systems (composite parabolic concentrator) dielectric or mirrored have been used.
    Also, in the area of solar thermal concentration systems, the two technologies that currently dominate the market are parabolic trough and tower.
    5
    10
    fifteen
    twenty
    25
    30
    35
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    Particularly, the parabolic trough technology consists of a parabolic mirror that focuses the light on an absorber tube through which a heat-carrying fluid circulates. Said fluid is heated and subsequently used to heat steam that is used in a traditional turbine cycle.
    At present, the production of electricity through solar thermal concentration plants is not among the most competitive from an economic point of view, within renewable technologies to obtain electricity from the sun. Plants with thermosolar concentration technology (either parabolic or tower cylinders) have higher energy production costs than those associated with photovoltaic or wind systems. However, solar thermal concentration systems have a competitive advantage in being able to operate with thermal storage. Such storage provides manageability, as well as electricity supply in the time slots where electricity consumption is most significant. This is a differentiating factor of solar thermal technology, compared to, for example, wind or photovoltaic technologies.
    In the case of photovoltaic solar concentration, more efficient and economical systems are achieved than those of solar thermal concentration, but they have the disadvantage that they are not manageable and cannot store energy efficiently and cost effectively, compared to solar thermal technology
    US 2009/0283144 A1 provides a device with one or several photovoltaic solar cells and at least one solar concentrator mirror located in the vicinity of the solar cells. The mirror comprises a multilayer optical film and a UV protection layer applied on the previous film, so that the solar concentrating mirror reflects a strip of the visible spectrum (the one corresponding to the solar cell's absorption bandwidth) towards the solar cell , and transmits the wavelengths that can degrade
    or negatively affect the solar cell. Thus an improved operation of the photovoltaic solar cells is achieved.
    As for the photovoltaic-solar thermal systems, there are several concepts in the scientific literature that use spectral separation to achieve a better use of the solar spectrum by combining solar thermal collectors and solar cells. However, the integration of solar thermal and photovoltaic technologies into a single hybrid solar concentration system is not trivial. Some proposals refer to spectral separation systems applied to a system with Stirling discs and motors.
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    It is therefore necessary to obtain a photovoltaic-solar thermal hybrid system that solves the aforementioned drawbacks, so that the integrated system is characterized by a lower cost than the standard solar thermal technology, due to the inclusion of the photovoltaic part working very efficiently in the selective spectral range, and that is also manageable, providing energy in a stable manner and in the time slots when it is really needed. SUMMARY OF THE INVENTION
    Therefore, the object of the invention is to provide a hybrid system of parametric solar thermal cylinder and photovoltaic receiver that allows storage and manageability of energy with lower production costs than standard solar thermal technology, being a more efficient integrated solar concentration system .
    The hybrid thermo-solar parametric cylinder and photovoltaic receiver system of the invention comprises a thermal absorber receiver through which a heat carrier fluid circulates, and, additionally, at least one spectral separation filter, located between the photovoltaic receiver and the thermal absorber receiver , which receives the reflected light from the primary mirror of the parametric cylinder and allows the selective separation of the solar spectrum, directing a part thereof towards the photovoltaic receiver and the rest towards the parametric cylinder.
    According to an embodiment of the invention the part of the solar spectrum directed towards the photovoltaic receiver is the part reflected by the spectral separation filter and the part of the solar spectrum directed towards the thermal absorbing receiver is the part transmitted by the spectral separation filter.
    According to another embodiment of the invention the part of the solar spectrum directed towards the photovoltaic receiver is the part transmitted by the spectral separation filter and the part of the solar spectrum directed towards the thermal absorbing receiver is the part reflected by the spectral separation filter.
    The spectral separation filter, therefore, allows selective separation of the solar spectrum, such that the radiation bands selectively target each of the receivers (thermal and photovoltaic). The spectral range of the focused part to the photovol receptor
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    Taico is specifically located in the strip where the solar cell operates with better performance. This results in a more efficient integrated system, in which costs are optimized.
    5 The hybrid system of the invention has the following advantages:
    - A better use of solar radiation is achieved with respect to traditional photovoltaic systems or solar thermal concentration separately. -It manages to provide the integrated manageability system, compared to the
    Traditional photovoltaic or photovoltaic concentration systems.
    10 Therefore, it is a solution that is economically more profitable, in which energy is manageable and where the advantages of renewable energies (reduction of greenhouse gases, pollution, etc.) are maintained.
    Other features and advantages of the present invention will be apparent from the following detailed description of an illustrative and non-limiting embodiment of its object in relation to the accompanying figures. BRIEF DESCRIPTION OF THE FIGURES
    Fig. 1: shows a schematic view of the invention according to an embodiment, hereinafter referred to as direct configuration.
    Fig. 2: shows a schematic view of the invention according to another embodiment, hereinafter referred to as reverse configuration.
    Fig. 3: shows a schematic view of another embodiment of the invention. Fig. 4: shows a schematic view of another embodiment of the invention.
    30 Fig. 5: shows a schematic representation of the operation of the spectral separation filter.
    Fig. 6: shows a scheme of the spectral separation filter architecture.
    35 Fig. 7. Thermal management system by means of extruded heatsink, with transverse orientation.
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    Fig. 8. Thermal management system by means of extruded heatsink, with parallel orientation. Fig. 9. Thermal management system by means of extruded heatsink that favors the internal flow of air, with parallel orientation.
    5 Fig. 10. Thermal management system by heat transfer tube (“heat pipe”). Fig. 11. Thermal management system through active cooling circuit.
    10 Fig. 12. Spectral separation filter transmission curve in direct configuration. Fig. 13. Spectral separation filter transmission curve in reverse configuration.
    P201331946
    12-31-2013 DETAILED DESCRIPTION OF THE INVENTION
    An embodiment of the invention is shown in Figure 1. The hybrid system of this embodiment of the invention is formed by:
    • A primary mirror 1 that focuses the light and preferably has a parabola shape.
    • A spectral separation filter 4, which will reflect a certain range of the visible spectrum useful for the photovoltaic receiver 3 that will be described later and will transmit the remaining wavelengths. The operation of the spectral separation filter 4 is conceptually shown in Figure 5. This element will preferably be manufactured by the deposition of multilayers of transparent oxides of low / high refractive index that would filter the spectrum as shown schematically in Figure 6. .
    • A thermal absorber receiver 2, which will preferentially capture the fringes of the spectrum with shorter and longer wavelengths than the band of the reflected visible.
    • A photovoltaic receiver 3, which will preferentially capture wavelengths in the visible. Said photovoltaic receiver 3 may be composed of:
    o Re-concentrating mirrors 8.
    o Photovoltaic solar cells 12 interconnected with each other.
    o Glass substrates to protect the cells and internal elements of the photovoltaic receiver 3.
    o Encapsulating materials.
    o Thermal management systems, consisting of:
    - a material that insulates the system electrically and transfers the heat generated in cell 12 to the heat sink, and
    -  A thermal management system. There are several options such as heat sinks manufactured by extrusion, heat transfer tubes (heat pipes) or active cooling circuits.
    The parametric cylinder 14 would comprise at least the primary mirror 1 and the thermal absorber receiver 2.
    In the embodiment of Figure 1 the thermal absorber receiver 2 is placed above the spectral separation filter 4, and the photovoltaic receiver 3 below said filter
    4. That arrangement allows the light reflected by the primary mirror 1 of the parametric cylinder 14 to be selectively separated in the spectral separation filter 4, so that the part
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    reflected by said filter 4 is directed towards the photovoltaic receiver 3, and the part transmitted by said filter 4 is directed towards the thermal absorber receiver 2.
    Figure 3 shows an embodiment in which the photovoltaic receiver 3 is located on the primary mirror 1 of the parametric cylinder 14.
    As an alternative design, there is the reverse option in which the transmitted part is directed to the photovoltaic receiver 3 (see Figure 2). In the embodiment of Figure 2 the thermal absorber receiver 2 is placed under the spectral separation filter 4, and the
    10 photovoltaic receiver 3 above said filter 4. That arrangement allows the light reflected by the primary mirror 1 of the parametric cylinder 14 to be selectively separated in the spectral separation filter 4, so that the part transmitted by said filter 4 is directed towards the photovoltaic receiver 3, and the part reflected by said filter 4 is directed towards the thermal absorber receiver 2.
    Figure 4 shows an embodiment of the invention in which the system optionally includes a secondary reflector or collector 5 that re-concentrates the light directly on the thermal absorber receiver 2, and which allows the primary opening area to be increased and, thereby, the temperature at which said receiver could operate. For simplicity the primary mirror 1 has not been represented.
    Figure 3 also shows the reflector or secondary collector 5 of Figure 4, although for simplicity some elements of the invention have been omitted in Figure 3.
    The system of the invention can have several spectral separation filters 4 and several
    25 photovoltaic receivers 3. In this way, the light absorber receiver 2 would be removed from the light range, which could have a lower efficiency.
    The primary mirror 1 of the parametric cylinder 14 can be made of curved glass, and have a reflective surface made of silver or aluminum. It could also be done in any
    30 reflective material.
    The spectral separation filter 4 can be curved, flat or faceted, and will be optimized to work transmitting / reflecting light in the range that maximizes the efficiency of the photovoltaic receiver 3.
    35
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    Figure 5 schematically represents the operation of a spectral separation filter 4, in which part of the light is reflected and part is transmitted, and Figure 6 schematically shows its architecture, with several layers 6 located on a substrate 7.
    The preferred method for manufacturing filters 4 is by sputtering or sputtering. This technique is a physical process in which the vaporization of the atoms of a solid material called "white" occurs by bombarding it by energy ions. It is combined layers of transparent oxides with different index of refraction and thickness. Said index of refraction and thickness of layers allows to determine the optical path that the light travels, thus determining the transmission / reflectance behavior that it will present, depending on the incident wavelength.
    The cooling or thermal management system of the photovoltaic receiver 3 can be passive (aluminum heatsinks 9 carried out by means of different manufacturing processes, heat transfer tubes ("heat pipes") or active (circulation of some fluid).
    Figures 7,8 and 9 show various configurations of thermal management systems made by means of heatsinks 9 manufactured by extrusion processes. Such heatsinks can be oriented transversely to cell 12 (Figure 7) or in parallel (Figures 8 and 9).
    Figure 10 shows a thermal management system using heat transfer tubes ("heat pipes"). A heat transfer tube (or “heat pipe”) is a passive heat evacuation system. It is a tube 10 sealed with a material adhered to its walls and containing a fluid inside. The heat is evacuated by a vapor-liquid phase change. The tube consists of three distinct sections: the evaporation section, the adiabatic section and the condensation section. The heat is transferred from the surface to be cooled to the evaporator where the fluid contained inside the tube 10 is vaporized and the steam rises therethrough through the adiabatic section until it enters the condensation section where said vapor condenses. The material adhered to the walls of the tube 10 generates capillary forces on the working fluid of the heat transfer tube and favors the movement of the fluid from the condenser to the evaporator. Through this system, a very effective heat transmission is guaranteed from the heat generating source (photovoltaic cell) to the heat dissipation fins 11. It is a tight confinement, which does not need pumping, and in which the fluid used will preferably be water. It can be designed to cool solar cells that
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    they must work at temperatures below a maximum temperature of about 60ºC-70ºC. To maintain its efficiency.
    The fluid to choose for use inside will depend on the operating temperature range of the heat transfer tube and also the material used for the cons
    5 tube 10, which is the most used, are the following: helium, nitrogen, ammonia, acetone, methanol, ethanol, water, toluene, mercury, sodium, lithium and silver. The most used materials for the construction of the tubes 10 are copper, nickel, steel, aluminum, niobium, tungsten and alloys between them.
    10 Figure 11 shows a thermal management system by means of an active cooling circuit 13. Said circuit 13 would use water or other cooling fluid, which circulates in contact with the rear of the photovoltaic receiver 3. Said fluid is heated as it travels longer , cooling the solar cell 12. This is the most efficient system of thermal dissipation, but it involves fluids in permanent movement, as well as devices that move it,
    15 such as bombs.
    The tube used in circuit 13 of Figure 11 can be made of steel or aluminum, and with a diameter between 50 and 200 mm. As for its length, it would be given by the length of the photovoltaic receiver 3. The tube could have some flat face, in order to improve the heat transmission in the contact area with the photovoltaic receiver 3.
    20 Relating to spectral separation filters 4, its design is determined by the direct or inverse configuration of the system.
    The materials of the filters 4 are preferably transparent glass substrates, multilayers of transparent conductive oxides such as silicon oxide or niobium oxide, transparent materials in the visible and reflective in the infrared (by way of example we can
    25 cite sheets of transparent oxides such as ITO), passivation layer and anti-reflective layer. The filter 4 may comprise all or some of the aforementioned layers.
    The passivation layer is a barrier layer that minimizes the diffusion of glass component (impurities such as Na) to the multilayer of transparent oxides.
    Preferably, the number of layers of the complete filter 4 (of the oxides part) would be 1 to 200 to 200. More preferably, it would be to 4 to 100, and even more preferably, 5 to 20.
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    The anti-reflective layer can be found at both ends of filter 4 or only one. Normally it will be on the side where the solar radiation affects. They are preferably layers of silicon oxide, since they have a low refractive index. It is desired that the refractive index of these layers be intermediate between that of glass and that of air.
    In the case of direct configuration, a filter 4 that provides:
     Maximum reflectance in the range (reflection band) 550-950 nm
     Maximum transmittance in the range 300-550 nm and 950-2500 nm
    Figure 12 shows the design and optical behavior at different angles of incidence of a spectral separation filter, according to the requirements described.
    As can be seen in the figure, the design of filter 4 is defined by the following sequence
    200L / V / 100L / 48H / (145L / 85H) x3 / 280L
    Being V glass, H transparent niobium oxide of high refractive index (n_H = 2.30) and L transparent silicon oxide of low refractive index (n_L = 1.43). The numbers that appear before each of these materials refer to the thickness of the layer of said material (in nanometers). In this particular design, the layer (145L / 85H) is repeated three times.
    The oxide layers may vary in the following thickness ranges: from 1 to 1000 nm and, more preferably, from 5 to 400 nm.
    The two outermost layers 200L and 280L are proposed as anti-reflective layers of the structure. In the case of reverse configuration, a filter 4 that provides:
     Maximum transmittance in the range (reflection band) 550-950 nm
     Maximum reflectance between 400-550 nm and 950-2500nm
    Figure 13 shows the design and optical behavior of a spectral separation filter 4, according to the requirements described above.
    V / M / 90L / 25H / (75L / 42H) x3 / 150L
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    Being V glass, H transparent niobium oxide of high refractive index (n_H = 2.30), L transparent silicon oxide of low refractive index (n_L = 1.43) and M is a transparent material in the visible and reflective in the IR. As an example, there are many transparent oxides such as ITO that can fulfill this function, not limited to the use of these materials.
    There is also the alternative of suppressing material M and simply using a transparent glass. In this case, a multilayer L / H should be added to reflect radiation in the 950-1300 nm range.
    The outermost layer 150L is proposed as a passivation and anti-reflective (AR) layer of the structure. The passivation layer is a barrier layer that minimizes the diffusion of the glass component to the multilayer of transparent oxides.
    A preferred embodiment of a hybrid photovoltaic-thermosolar system is described below, which would correspond to that of Figure 2.
    Said system would be formed by a parametric cylinder 14, with an aperture of 8.2 m and a focal length of 2,235 m (the focal distance being the distance between the primary mirror 1 of the parametric cylinder 14 and the photovoltaic receiver 3). The spectral separation filter 4 would reflect the light in a 70 mm diameter absorber receiver tube 2. At a distance of less than 100 mm from the tube, the spectral separation filter 4 is positioned, which would preferably transmit the light in the range of 500 to 950 nm to the photovoltaic receiver 3.
    In the reflected light bulb, a thermal receiver 2 with a diameter of 90 mm would be positioned.
    As for the spectral separation filter 4, a structure defined by the following sequence is proposed
    M / 90L / 25H / (75L / 42H) x3
    Being H transparent niobium oxide of high refractive index (n_H = 2.30), L transparent silicon oxide of low refractive index (n_L = 1.43) and M is a transparent material in the visible and reflective in the IR.
    There is an alternative to suppress material M and simply use a transparent glass. In this case, a multilayer L / H should be added to reflect radiation in the 950-1300 nm range.
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    For material H, TiO2 and Nb2O5 could preferably be used to be deposited with SiO2, due to the difference in refractive index between them. The layer structure can vary between 5 and 100, depending on the performance that is intended to be removed from the filter.
    5 Optionally, a component diffusion barrier layer between the glass and the multilayer can be deposited at the ends of the multilayer structure, in addition to antireflective layers at the other end, together with a hard layer that protects the structure from abrasive agents.
    10 The glass on which to deposit the multilayer could be composed of an anti-reflective layer deposited on one or two sides.
    Although the present invention has been described entirely in connection with preferred embodiments, it is clear that those modifications can be made within its
    15 cance, not considering this as limited by the previous embodiments, but by the content of the following claims.
    权利要求:
    Claims (25)
    [1]

    1.-Hybrid system of thermosolar parametric cylinder (14) and photovoltaic receiver (3), comprising a thermal absorber receiver (2) through which a heat-carrier fluid circulates, characterized in that it additionally comprises at least one spectral separation filter ( 4), located between the photovoltaic receiver (3) and the thermal absorber receiver (2), which receives the reflected light from the primary mirror (1) of the thermosolar parametric cylinder (14) and which allows selective separation of the solar spectrum, directing a part thereof towards the photovoltaic receiver (3) and the rest towards the thermal absorber receiver (2).
    [2]
    2. Hybrid system of thermosolar parametric cylinder (14) and photovoltaic receiver (3), according to claim 1, characterized in that the part of the solar spectrum directed towards the photovoltaic receiver (3) is the part reflected by the spectral separation filter ( 4) and the part of the solar spectrum directed towards the thermal absorber receiver (2) is the part transmitted by the spectral separation filter (4).
    [3]
    3. Hybrid system of thermosolar parametric cylinder (14) and photovoltaic receiver (3), according to claim 1, characterized in that the part of the solar spectrum directed towards the photovoltaic receiver (3) is the part transmitted by the spectral separation filter ( 4) and the part of the solar spectrum directed towards the thermal absorber receiver (2) is the part reflected by the spectral separation filter (4).
    [4]
    4. Hybrid system of the thermosolar parametric cylinder (14) and photovoltaic receiver, according to claim 1 or 2, characterized in that the photovoltaic receiver (3) is located on the primary mirror (1) of the thermosolar parametric cylinder.
    [5]
    5. Hybrid system of thermosolar parametric cylinder (14) and photovoltaic receiver (3), according to any of the preceding claims, characterized in that it additionally comprises a secondary collector (5) that reconcentrates the light on the thermal absorber receiver (2).
    [6]
    6. Hybrid system of thermosolar parametric cylinder (14) and photovoltaic receiver (3), according to any of the preceding claims, characterized in that it comprises several spectral separation filters (4) and several photovoltaic receivers (3).
    [7]
    7. Hybrid system of thermosolar parametric cylinder (14) and photovoltaic receiver (3), according to any of the preceding claims, characterized in that the primary mirror (1) of the parametric cylinder can be made of curved glass.
    [8]
    8.- Thermosolar parametric cylinder hybrid system (14) and photovoltaic receiver (3), according to

    claim 7, characterized in that the reflective surface of the primary mirror (1) of the parametric cylinder can be made of silver or aluminum.
    [9]
    9. Hybrid system of thermosolar parametric cylinder (14) and photovoltaic receiver (3), according to any of the preceding claims, characterized in that the at least one spectral separation filter (4) can be curved, flat or faceted.
    [10]
    10.- Thermosolar parametric cylinder hybrid system (14) and photovoltaic receiver (3), according to any of the preceding claims, characterized in that the photovoltaic receiver (3) comprises:
    -glass
    -encapsulants
    - interconnected photovoltaic cells (12) and
    -a thermal management system.
    [11]
    11. - Hybrid system of thermosolar parametric cylinder (14) and photovoltaic receiver (3), according to claim 10, characterized in that the photovoltaic receiver (3) additionally comprises reconcentrating mirrors (8).
    [12]
    12.-Hybrid system of thermosolar parametric cylinder (14) and photovoltaic receiver (3), according to claim 10 or 11, characterized in that the thermal management system of the photovoltaic receiver (3) is a passive system, such as a heatsink system ( 9) extruded aluminum.
    [13]
    13.- Hybrid system of thermosolar parametric cylinder (14) and photovoltaic receiver (3), according to claim 10 or 11, characterized in that the thermal management system of the photovoltaic receiver (3) is an active system, with a circuit (13) through which coolant circulates.
    [14]
    14.- Hybrid system of thermosolar parametric cylinder (14) and photovoltaic receiver (3), according to claim 13, characterized in that the cooling fluid is water.
    [15]
    15.- Hybrid system of thermosolar parametric cylinder (14) and photovoltaic receiver (3), according to claim 10 or 11, characterized in that the thermal management system of the photovoltaic receiver (3) is a consistent heat transfer tube system in a tube (10) sealed with a material adhered to its walls and containing fluid inside.
    [16]
    16. Hybrid system of thermosolar parametric cylinder (14) and photovoltaic receiver (3), according to any of the preceding claims, characterized in that the spectral separation filter (4) comprises an anti-reflective, passivation, glass and a

    multilayer of transparent conductive oxides.
    [17]
    17. Hybrid system of thermosolar parametric cylinder (14) and photovoltaic receiver (3), according to any of claims 2 and 4 to 16, characterized in that the spectral separation filter (4) is a maximum reflectance filter between 550 and 950 nm, and maximum transmittance between 300 and 550 nm and between 950 and 2500 nm.
    [18]
    18.- Hybrid system of thermosolar parametric cylinder (14) and photovoltaic receiver (3), according to claim 17, characterized in that the spectral separation filter (4) is defined by the following sequence:
    200L / V / 100L / 48H / (145L / 85H) x3 / 280L
    where V is glass, H transparent niobium oxide of high refractive index (n_H = 2.30) and L transparent silicon oxide of low refractive index (n_L = 1.43), and in which the numbers that appear before each of the Materials refer to the thickness of the layer of said material (in nanometers), the layer (145L / 85H) being repeated three times.
    [19]
    19. Hybrid system of thermosolar parametric cylinder (14) and photovoltaic receiver (3), according to any of claims 3 to 16, characterized in that the spectral separation filter (4) is a maximum reflectance filter between 400 and 550 nm and for more than 950 nm, and maximum transmittance between 550 and 950 nm.
    [20]
    20.- Hybrid system of thermosolar parametric cylinder (14) and photovoltaic receiver (3), according to claim 19, characterized in that the spectral separation filter (4) is defined by the following sequence:
    V / M / 90L / 25H / (75L / 42H) x3 / 150L
    where V is glass, H transparent niobium oxide of high refractive index (n_H = 2.30), L transparent silicon oxide of low refractive index (n_L = 1.43) and M a transparent material in the visible and reflective in the infrared, and in which the numbers that appear before each of the materials refer to the thickness of the layer of said material (in nanometers), the layer (75L / 42H) being repeated three times.
    [21]
    21. - Hybrid system of thermosolar parametric cylinder (14) and photovoltaic receiver (3), according to any of the preceding claims, characterized in that the number of oxide layers of the spectral separation filter (4) is between 1 and 200.

    [22]
    22.- Hybrid system of thermosolar parametric cylinder (14) and photovoltaic receiver (3), according to claim 21, characterized in that the number of oxide layers of the spectral separation filter (4) is between 4 and 100.
    [23]
    23.- Hybrid system of thermosolar parametric cylinder (14) and photovoltaic receiver (3), according to claim 22, characterized in that the number of oxide layers of the spectral separation filter (4) is between 5 and 20.
    [24]
    24. Hybrid system of thermosolar parametric cylinder (14) and photovoltaic receiver (3), according to any of the preceding claims, characterized in that the thickness of the oxide layers is between 1 and 1000 nm.
    10 25. Hybrid system of thermosolar parametric cylinder (14) and photovoltaic receiver (3), according to claim 24, characterized in that the thickness of the oxide layers is between 5 and 400 nm.
    [26]
    26. Hybrid system of thermosolar parametric cylinder (14) and photovoltaic receiver (3), according to
    any of the preceding claims, characterized in that the primary mirror (1) 15 has a parabola shape.
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    ES2539511B1|2016-05-18|
    US20160329861A1|2016-11-10|
    WO2015101692A1|2015-07-09|
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