JP2008185300A - Collector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To uniformly keep the temperature of a heat medium at high temperatures by receiving solar light toward a focal point of a parabolic reflector by heat collecting tubes. <P>SOLUTION: This heat collector 25 is composed of the parabolic reflector 1 for collecting solar light, the plurality of heat collecting tubes 5 disposed around the focal point 2 of the parabolic reflector 1 for circulating the heat medium 6, a heat collecting portion 4 constituted by spirally winding the plurality of heat collecting tubes 5 around the focal point 2, and an exterior 22 receiving the parabolic reflector 1 and the heat collecting portion 4, so that the solar light toward the focal point 2 of the parabolic reflector 1 is uniformly collected by the plurality of heat collecting tubes 5, and the heat medium 6 circulated in the heat collecting portion 4 can be uniformly heated to high temperatures. Further the radiation from the heat collecting portion 4 is prevented, thus the heat for heating the heat medium 6 to the high temperature can be efficiently collected. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heat collector that collects solar light and collects solar heat.

Conventionally, this type of heat collector is along the longitudinal direction of the radiating cylindrical reflector between the focal point of the radiating cylindrical reflector and the apex of the opening passing through the center on the surface of the radiating cylindrical reflector and on the focal line. A plurality of heat collecting tubes are arranged so that the uppermost tube of the heat collecting tube row is located on the focal line, and both direct sunlight and scattered light are collected (see, for example, Patent Document 1).
JP-A-55-105147

  However, in the prior art, since the heat collecting tube disposed on the focal point of the reflecting mirror is a part of the plurality of heat collecting tubes, direct sunlight other than the heat collecting tube that receives the direct sunlight condensed by the reflecting mirror is used. There is a problem that the temperature of the heat medium that passes through the heat collecting tube without being hit can not be increased.

  In addition, even if it can receive scattered light, it cannot collect light as it is on the focal point, so there is also a problem that the heat collection efficiency of the heat collector cannot be improved by dissipating solar heat collected on the focal point with other heat collecting tubes. there were.

  The present invention solves the above-described conventional problems, and a plurality of heat collecting tubes are arranged around the focal point of a parabolic reflector so that sunlight toward the collecting point is always received by each heat collecting tube. The purpose of this is to keep the temperature of the heat medium uniform at a high temperature.

  In order to solve the above-described conventional problems, the heat collector according to the present invention includes a plurality of parabolic reflectors that collect sunlight and a plurality of heat media provided around the focal points of the parabolic reflectors. A plurality of heat collecting tubes, a heat collecting portion provided in a configuration in which the plurality of heat collecting tubes are spirally wound around the focal point, and an exterior housing these parabolic reflectors and the heat collecting portion. Is.

  As a result, the sunlight toward the focal point of the parabolic reflector is always concentrated on the plurality of heat collecting tubes, so that the temperature of the heat medium flowing through the heat collecting portion is heated to a high temperature.

  In addition, since the heat collecting section is configured by spirally winding a plurality of heat collecting tubes around the focal point of the parabolic reflector, the plurality of heat collecting tubes have a portion where sunlight is always collected. The heat collecting efficiency can be improved by reducing heat radiation from the heat collecting section.

  The heat collector of the present invention uniformly concentrates sunlight toward the focal point of the parabolic mirror on a plurality of heat collecting tubes, so that the temperature of the heat medium flowing through the heat collecting portion is uniformly heated to a high temperature. Can do.

  Moreover, the heat radiation from the heat collecting part is prevented, and the amount of heat for heating the heat medium to a high temperature is efficiently recovered.

A first invention is a parabolic reflector for collecting sunlight, a plurality of heat collecting tubes through which a heat medium provided around a focal point of the parabolic reflecting mirror, and the plurality of heat collecting tubes Is provided with a heat collecting portion provided in a configuration that spirally circulates around the focal point, and an outer housing that houses these parabolic reflectors and the heat collecting portion, so that a plurality of heat collecting tubes have a parabolic surface. Since the sunlight toward the focal point of the reflecting mirror is uniformly collected, the temperature of the heat medium flowing through the heat collecting unit can be uniformly heated to a high temperature.

  Moreover, the heat radiation from the heat collecting part is prevented, and the amount of heat for heating the heat medium to a high temperature is efficiently recovered.

  In the second invention, in particular, the heat collecting section of the first invention has a plurality of heat collecting tubes arranged at equal distances from the focal point of the parabolic reflector, so that the same heat collecting portion is arranged on the plurality of heat collecting tubes. The sunlight in the light state can be applied to raise the temperature of the heat collecting tube uniformly, and the heat medium flowing through the heat collecting tube can be heated uniformly.

  In the third invention, in particular, the heat collecting part of the first or second invention has a plurality of heat collecting tubes arranged around the focal point so that the outer walls of the heat collecting tubes are in contact with each other. Since the temperature of the back part which does not receive the condensed sunlight reflected on the parabolic reflector of the heat collecting tube is raised and heat radiation is prevented, the heat collecting efficiency of the heat collecting part can be improved.

  In the fourth invention, in particular, the heat collecting part of any one of the first to third inventions is partitioned into a plurality of layers at the ends of the plurality of heat collecting pipes, and the respective heat collecting pipes communicate with each other. By providing an inlet communication part and an outlet communication part so that a plurality of heat collecting tubes form a single path, a plurality of heat collecting tubes are arranged at equal distances from the focal point and bent so as not to crush the heat collecting tubes Since the distance can be set smaller than this, it is possible to bring all of the heat collection tubes closer to the focal point, concentrate the sunlight reflected by the parabolic reflector, and raise the temperature of all the heat collection tubes to a high temperature. it can.

  In the fifth aspect of the invention, in particular, the heat collecting part of any one of the first to fourth aspects of the present invention is the arrangement of the heat collecting tube by arranging a cylindrical permeation tube around the heat collecting tube and forming a sealed structure around the heat collecting tube. Since the surroundings are evacuated and the air layer is eliminated, heat dissipation due to convection from the heat collecting tube to the permeation tube can be prevented, and the heat collecting efficiency of the heat collecting portion can be improved.

  In the sixth aspect of the invention, in particular, when the heat collecting portion of any one of the first to fifth aspects of the present invention brings the plurality of heat collecting tubes into contact with the outer walls of the respective heat collecting tubes around the focal point, the contact area of the outer walls. In order to increase the heat collecting tube, the flat portion is configured and arranged, so that a plurality of the heat collecting tubes are gathered closer to the focal point, and the sunlight reflected by the parabolic reflector is more condensed, The temperature of the plurality of heat collecting tubes can be made uniform, and the temperature of the heat medium can be raised and made uniform.

  The seventh aspect of the invention is particularly configured so that the parabolic reflector can rotate around the heat collecting portion of any one of the first to sixth aspects and the focal point of the parabolic reflector as the center of rotation. A rotation support unit that is supported, a drive unit that rotates the parabolic reflector, and a control unit that controls the drive unit, and an exterior housing the heat collection unit, the parabolic reflector, and the drive unit. By configuring, the control unit operates the drive unit according to the season and the solar altitude of the day based on the annual movement of the sun, rotates the parabolic reflector, and adjusts the sun for that time of the day. Because the sunlight reflected on the parabolic reflector is always focused on the focal point, the temperature of the heat collecting part is raised to a high temperature and the heat medium is heated to a high temperature. Can be heated.

  Embodiments of the present invention will be described below with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1, 2, and 3, reference numeral 1 denotes a parabolic reflector that condenses sunlight, and the shape thereof is formed in a saddle shape with a parabolic cross section in order to focus sunlight on a focal point 2.

  This bowl-shaped parabolic reflector 1 is arranged in the azimuth direction (east-west direction), and the reflecting surface 3 is finished to be a mirror surface in order to improve the reflectance of sunlight.

  The mirror surface finishing of the reflecting surface 3 includes methods such as plating, vapor deposition, polishing, and coating with materials constituting the parabolic reflecting mirror 1. Processing of the parabolic reflecting mirror 1 includes methods such as molding a heat-resistant resin (for example, phenol resin, fluorine resin, polyimide resin, etc.), pressing stainless steel, and aluminum die casting. There is also a method of bending an aluminum mirror finish plate.

  For example, when the parabolic reflecting mirror 1 is molded from a heat-resistant resin, the reflecting surface 3 is formed by finishing it with aluminum plating (evaporation) or painting to make a mirror surface. In particular, when the mirror surface is plated with aluminum, polyimide resin, polyphenylene sulfide resin, polyester resin, polyamide resin, or the like is used. Further, when stainless steel is pressed, a mirror surface may be formed by aluminum electrolytic polishing or buffing.

  In addition, the aluminum die casting may be mirror-finished by plating or the like to prevent a reduction in reflectance due to an oxide film after polishing of the aluminum die casting material.

  The heat collecting part 4 arranged around the parabolic focal point 2 of the parabolic reflector 1 is composed of a plurality of heat collecting tubes 5 (copper tube, stainless steel tube, brass tube, aluminum tube, etc.). It is provided as if it circulates spirally around it.

  Thus, by the structure which circulates spirally, all the heat collecting tubes 5 receive the sunlight which concentrates on the focus 2 of the parabolic reflecting mirror 1 similarly, and when it circulates just above a focus, direct sunlight Is also received in the same way so that it receives sunlight under the same conditions.

  That is, a plurality of heat collecting tubes 5 are arranged at equal distances from the focal point 2 of the parabolic reflecting mirror 1, and the heat collecting tubes 5 are irradiated with sunlight in the same condensing state so as to increase the temperature uniformly. The heating medium 6 that circulates is uniformly heated.

  The plurality of heat collecting tubes 5 are arranged so that the respective outer walls are in contact with each other, and the temperature of the back side of the heat collecting tube 5 that does not receive the condensed sunlight reflected by the parabolic reflector is raised. The temperature of the heat tube 5 is kept uniform.

  The heat collecting tubes 5 are configured so that their respective end portions are sequentially connected and communicate with one path. Thereby, without reducing the flow velocity of the heat medium 6 flowing through the heat collecting tube 5, the area of the heat collecting tube 5 receiving sunlight in the condensed state is expanded to collect solar heat.

  The heat collecting pipes 5 are set to an odd number of plural, and the inlet side 7 and the outlet side 8 of the heat medium 6 flowing into the heat collecting section 4 are arranged separately at both ends.

  In some cases, an even number of the plurality of heat collecting tubes 5 are provided, and the inlet side 7 and the outlet side 8 of the heat medium 6 flowing into the heat collecting unit 4 are provided on the same side.

  The portion from the inlet side 7 to the middle 9 and the portion from the middle 9 to the outlet side 8 of the heat collecting tube 5 are folded with a predetermined curvature to prevent crushing. The folded portion of the heat collecting tube 5 is provided inside the parabolic reflecting mirror 1.

  At this time, the heat collecting tube 5 on the inlet side 7 and the heat collecting tube 5 on the outlet side 8 are constituted by a single heat collecting tube 5 and are arranged on the focal point 2 so as to collect sunlight.

  The folded portion of the heat collecting tube 5 is provided outside the parabolic reflecting mirror 1 so that the light collecting state of the heat collecting tube 5 inside the parabolic reflecting mirror 1 is made uniform or the folded portion of the collecting tube 5 is folded. In some cases, the curvature can be freely set to facilitate the folding.

  In the parabolic reflecting mirror 1, the amount of sunlight collected at the focal point 2 is increased by increasing the width of the opening 10, and the temperature of the heat collecting unit 4 is increased to a high temperature.

  As the heat medium 6, alternative chlorofluorocarbon (HFC) 134A and carbon dioxide (CO2) are used, or heat medium oil (mineral oil such as silicone oil) is used.

  Since the parabolic reflector 1 focuses the sunlight 2 only in one direction, in order to concentrate the sunlight on the heat collecting part 4, the sunlight is applied perpendicular to the reflector 1, or It is necessary to apply sunlight at an appropriate angle parallel to the azimuth direction of the saddle to reflect it to the reflecting surface 3 and to bounce and collect light at the same angle on the heat collecting section 3 on the opposite side.

  In order to match the characteristics of the parabolic reflecting mirror 1, a driving unit 11 for rotation around the heat collecting unit 4 to which the parabolic reflecting mirror 1 is fixed, and the parabolic reflecting mirror 1 by the driving unit 11. Is provided with an actuating portion 12 that integrally rotates the same at the same angle.

  However, since the heat collecting part 4 determines and fixes the positional relationship in the opening 10 of the reflector 1 when facing the sun in the south during spring equinox (autumn), At the same time, the parabolic reflector 1 always faces the sun, but the heat collecting section 4 is exposed to sunlight somewhere in the plurality of heat collecting tubes 5 except for the altitude in the south and middle when the sun is in the spring equinox (autumn). I am doing so.

  The drive unit 11 rotates a drive unit operation plate 13 mounted on a shaft by combining a motor, a gear, and a cam, and a rod-like operation unit 12 is mounted on the drive unit operation plate 13.

  Further, the drive unit 11 can be set to any angle using a stepping motor. The actuating part 12 is connected to the drive part actuating plate 13 through a pin 15 so as to be freely rotatable, and is operated to be pushed and pulled by the rotation of the drive part actuating plate 13.

  One end of the operating unit 12 is fixed to the reflecting mirror operating plate 14 having the same shape as the driving unit operating plate 13 provided at the end of the parabolic reflecting mirror 1 with a pin 15, and is the same as the driving unit operating plate 13. The reflecting mirror actuating plate 14 is pushed or pulled in conjunction with the operation of pushing or pulling by the rotation of the driving unit actuating plate 13 so that the heat collecting unit 4 is pivoted. The parabolic reflector 1 is rotated as follows.

  The reflector operating plate 14 is fixed to either one of the end faces 16 attached to both ends of the parabolic reflector 1 (the end faces 16 at both ends are also possible).

  The end face 16 is subjected to surface treatment with the same material as the parabolic reflector 1. An opening 17 is provided in the end face 16, and the heat collecting tubes 5 on the inlet side 7 and the outlet side 8 of the heat collecting section 4 are inserted.

  A cylindrical bearing portion 18 is provided by extending the opening 17 of the end face 16 so as not to contact the heat collecting portion 4, and a rotary bearing 19 is provided around the cylindrical bearing portion 18.

The rotary bearing 19 uses a bearing bearing or a non-contact fluid bearing. One of the rotation bearings 19 is fixed to the rotation support unit 20, whereby the parabolic reflector 1 is provided in an independent configuration so as not to contact the heat collection unit 4.

  A selective absorption film is formed on the surface of the plurality of heat collecting tubes 5 (not shown). In the selective absorption film, the surface of the heat collecting tube 5 is plated with black black chrome or electroless nickel. In addition, manganese-based black paint may be applied instead of plating.

  21 is a control unit for controlling the operation of the drive unit 11, which operates the drive unit 11 according to the season and the solar altitude of the day based on the annual movement of the sun stored in the microcomputer or the like, and moves the operation unit 12 The parabolic reflecting mirror 1 is rotated to instruct to adjust to the altitude at which the solar radiation of the day of the day is maximized.

  Thereby, the sunlight reflected by the parabolic reflecting mirror 1 is concentrated with the heat collecting part 4 as the focal point 2, and the temperature of the heat collecting part 4 is increased to a high temperature.

  Reference numeral 22 denotes an exterior housing the parabolic reflecting mirror 1, the heat collecting unit 4, the operating unit 12, and the driving unit 11, and is configured in a box shape in which a transmission body 23 is provided in the upper opening.

  The exterior 22 is made of stainless steel with little corrosion or a weather resistant resin material (for example, polyester resin, polycarbonate resin, etc.). The interior of the exterior 22 is configured to cover the surroundings of the parabolic reflector 1 and the heat collecting unit 4 with an exterior heat insulating material 24. The exterior heat insulating material 24 is composed of heat-resistant rock wool, glass wool, or the like, and its surface is cured to form a wall surface by itself or to reinforce the inner surface with a plate.

  The transmissive body 23 is provided on the upper part of the parabolic reflecting mirror 1, takes in sunlight, and prevents rain and dust from entering the inside of the parabolic reflecting mirror 1.

  The transparent body 23 uses transparent glass having a high transmittance in order to allow sunlight to pass therethrough. The solar radiation transmittance of such transparent glass is about 90%. The exterior heat insulating material 24 is inclined toward the transmitting body 23 so as to spread upward, so that a large amount of sunlight can be received by the reflecting mirror according to the altitude of the sun.

  Reference numeral 25 denotes a heat collector configured by enclosing and storing the parabolic reflector 1 and the heat collecting section 4 with an exterior heat insulating material 24 and having an exterior 22 in which an upper portion of the parabolic reflector 1 is opened with a transmission body 23.

  26 is a circulation pump for the heat medium 6, 27 is a circuit through which the heat medium 6 flows, and 28 is a heat storage tank for storing high-temperature heat from the heat medium 6.

  The heat storage tank 28 uses a latent heat type using a phase change of a molten salt having a high melting point, a sensible heat type using a molten salt, oil, or the like, or a steam accumulator that stores steam in the form of pressure water, or a high temperature of 100 ° C. or higher. To store the heat.

  The operation and action of the heat collector configured as described above will be described below.

  First, when the control unit 21 is given support for operation, the circulation pump 26 is operated to circulate the heat medium 6 in the circuit 27 and send it to the heat collector 25.

In the heat collector 25, the driving unit 11 is rotated according to the solar altitude data stored in the microcomputer of the control unit 21 to move the operating unit 12, and the parabolic reflector 1 is rotated around the heat collecting unit 4. The solar light is directed to a position where it strikes vertically along the apex of the opening 10 of the parabolic reflector 1.

  For example, if the sun is in the south, the sunlight hits the reflecting surface 3 of the parabolic reflector 1 at a right angle from any direction with respect to altitude and direction, and the reflected light is reflected by the parabola and provided around the focal point 2. The sunlight is concentrated on the heat collecting unit 4 to increase the temperature of the heat collecting unit 4.

  Even if the incident direction of sunlight is different due to different solar altitudes as shown in FIGS. 2A and 2B, the parabolic reflector 1 is rotated so that the sunlight is vertically applied by the rotation of the parabolic reflector 1. I am doing so.

  About 90% of sunlight is absorbed by the heat collecting section 4 by the selective absorption film mounted on the surface of the plurality of heat collecting tubes 5, and the temperature of the plurality of heat collecting tubes 5 rises.

  When the heat medium 6 is sent to the heat collecting tube 5, the heat medium 6 receives the heat of the heat collecting tube 5 to form a high-temperature liquid or vapor (or a liquid or a mixture of the vapor and the liquid) to the heat storage tank 28. Sent.

  At this time, the plurality of heat collecting tubes 5 are configured to circulate in this spiral shape, so that the heat medium 6 supplied to the heat collecting tubes 5 similarly receives sunlight concentrated on the focal point 2 of the parabolic reflector 1. When it goes around just above the focal point, direct sunlight is also received in the same way so that it receives sunlight under the same conditions and is uniformly heated to a high temperature.

  The heat storage tank 28 receives this liquid or vapor and accumulates an amount of heat of 100 ° C. or higher. The liquid or vapor of the heat medium 6 is condensed into a liquid in the heat storage tank 28 and is sent again to the heat collector 25 by the circulation pump 26 so as to be heated.

  This operation is repeated while solar heat can be supplied, so that the necessary amount of heat is maintained in the heat storage tank 28.

  At this time, the controller 21 moves the parabolic reflector 1 at any time according to the altitude of the sun, so that the sunlight is always reflected on the parabolic reflector 1 even if the direction of the sun changes from the south. Then, the drive unit 11 is controlled so as to reach the focal point 2.

  As described above, in the present embodiment, a plurality of parabolic reflecting mirrors 1 for collecting sunlight and a plurality of heat mediums 6 provided around the focal point 2 of the parabolic reflecting mirror 1 circulate. A heat collecting tube 5, a heat collecting portion 4 provided in a configuration that spirally surrounds the plurality of heat collecting tubes 5 around the focal point 2, and an exterior housing these parabolic reflector 1 and the heat collecting portion 4 When the heat medium 6 supplied to the plurality of heat collecting tubes 5 receives the sunlight concentrated on the focal point 2 of the parabolic reflector 1 in the same manner and goes around just above the focal point. Since direct sunlight is received in the same manner, sunlight of the same condition is received and condensed uniformly, so that the temperature of the heat medium 6 can be uniformly heated to a high temperature.

  In the present embodiment, since the heat collecting section 4 is configured by arranging a plurality of heat collecting tubes 5 around the focal point of the parabolic reflecting mirror 1, the plurality of heat collecting tubes 5 are always provided with sunlight. Can be condensed to reduce heat radiation from the heat collecting section 4 and improve the heat collecting efficiency.

  In the present embodiment, the heat collecting section 4 has a plurality of heat collecting tubes 5 arranged at equal distances from the focal point 2 of the parabolic reflecting mirror 1. By applying sunlight in the light state, the temperature of the heat collecting tube 5 can be increased uniformly, and the heat medium 6 flowing through the heat collecting 5 can be heated uniformly.

Further, in the present embodiment, the plurality of heat collecting tubes 5 are configured so that their respective end portions are sequentially connected and communicated with one path, so that the heat medium 6 flowing through the heat collecting tube 5 can be used. Without reducing the flow rate, the area of the heat collecting tube 5 that receives sunlight in the condensed state can be expanded to recover solar heat, and the transfer of solar heat to the heat medium 6 can be efficiently promoted. By not reducing the flow rate of the heat medium 6 in the heat collecting tube 5, it is possible to prevent a decrease in heat transfer performance from the heat collecting tube 5 to the heat medium 6.

  Further, in the present embodiment, the heat collecting tube 5 is configured to be folded with a curvature to the heat collecting tube 5 when connected to the portion from the inlet side 7 to the middle 9 and from the middle 9 to the outlet side 8. The flow of the heat medium 6 can be changed to promote the mixing of the flow along the inner wall in the heat collecting tube 5 and the flow in the central portion, and the temperature distribution can be made uniform.

  Further, in the present embodiment, the folded portion of the heat collecting tube 5 is provided inside the parabolic reflector 1, so that the sunlight is also condensed on the folded portion, thereby increasing the amount of collected solar heat. it can.

  Further, in the present embodiment, the heat collecting tube 5 on the inlet side 7 and the heat collecting tube 5 on the outlet side 8 have only one part that enters the parabolic reflector 1 and one part that exits from the parabolic reflector 1. The solar heat collecting tube 5 is arranged on the focal point 2 and the sunlight is condensed on the focal point 2, so that the solar heat is recovered without causing the temperature of the heat medium 6 to decrease, and the solar heat is transferred to the heat medium 6. It can be promoted efficiently.

  In the present embodiment, the heat collecting section 4 has a plurality of heat collecting tubes 5 arranged at an equal distance from the focal point 2 of the parabolic reflecting mirror 1, so that one heat collecting tube 5 is provided on the focal point 2. Even if the arrangement is shifted with respect to the focal point 2 at the time of assembly, the concentrated sunlight can be received, so that the assembly can be facilitated.

  In the present embodiment, the heat collecting tube 5 is formed with a selective absorption film that absorbs infrared rays on the surface thereof, thereby preventing infrared radiation from the heat collecting tube 5 and maintaining the temperature of the heat collecting tube 5 at a high temperature. Thus, the heat can be efficiently transmitted to the heat medium 6.

  Moreover, in this Embodiment, the control part 21 operates the drive part 11 according to a season and the solar altitude of the day based on the annual movement of the sun, and moves the operation part 12 and parabolic reflection. Since the mirror 1 is rotated and supported so as to be adjusted to the altitude at which the solar radiation of the time of the day is maximized, the sunlight reflected by the parabolic reflector 1 thereby collects heat on the focal point 2. The temperature of the heat collecting part 4 can be raised to a high temperature by concentrating on the part 4, and the high temperature heat can be transmitted to the heat medium 6 using a lot of time of the day for a long period of time.

  Moreover, in this Embodiment, since the parabolic reflector 1 was comprised by the parallel wire, sunlight can be concentrated on the focus 2 of the parabolic reflector 1, and it is required from sunlight with low energy density. The amount of heat and temperature can be obtained.

  In the present embodiment, since the parabolic reflecting mirror 1 has the transmitting body 23 attached to the opening 10 side, rainwater and dust do not accumulate in the exterior 22, so that the exterior 22 is collected over a long period of time. Thermal efficiency can be maintained well.

  Further, since the transmissive body 23 is placed on the parabolic reflecting mirror 1, heat is trapped in the parabolic reflecting mirror 1, and heat radiation due to convection from the heat collecting tube 5 is prevented, so that the heat collecting tube 5 The temperature can be maintained at a high temperature and the heat can be efficiently transferred to the heat medium 6.

In addition, the transmissive body 23 of the present embodiment is made of a resin material (for example, polycarbonate) having a selective permeation performance and excellent heat resistance and weather resistance, thereby reducing the weight and cost of the heat collector 25. It can be performed.

  In addition, the parabolic reflector 1 of the present embodiment uses a reflector of a compound parabolic concentrator (CPC) so that a predetermined inclination angle of sunlight (for example, sunlight) If the incident angle is about 30 ° from the zenith, the light condensing ratio is about 3 times, and if the incident angle is narrowed to about 20 °, the light condensing ratio is expanded to about 7 times. As the sunlight is more focused, the amount of heat irradiated at the opening 10 increases and the temperature rises.

  However, when the condensing ratio is increased, the angle at which sunlight can be incident becomes narrower with respect to the zenith. Therefore, there are many restrictions on the condensing time at the condensing unit, the installation location, and the like, which needs to be considered. On the other hand, since it can concentrate on the heat collection part 4, it is comprised so that it is not necessary to make the range which rotates the parabolic reflector 1 small or to rotate with respect to the altitude of the sun. Cost reduction can be achieved by simplifying the components and control.

In addition, the exterior 22 of the present embodiment is filled with a gas having a low thermal conductivity (for example, krypton gas) and sealed, so that the air in the space for the movable part of the reflector 1 in the exterior 20 is sealed. Therefore, it is possible to reduce the heat radiation from the exterior 22 and improve the heat collection efficiency. Moreover, by filling the inert gas, the high-temperature heat collecting section 4 is covered to improve safety, prevent the exterior heat insulating material 24 from being deteriorated, and endure long-term use.

  Further, the heat collector 25 of the present embodiment fixes the solar altitude direction (the alignment of the parabolic reflectors 1 is aligned with the north-south direction, for example, the inclination angle of the installation base is in the middle of spring or autumn. The sun light vertically hits the reflector 1) and rotates the parabolic reflector 1 with respect to the sun's azimuth movement. It is also possible to concentrate sunlight on the heat collecting unit 4.

  In addition, since heat is stored in the heat storage tank 28 of the present embodiment, the heat is used at night, or is supplemented when sufficient heat cannot be obtained when it is cloudy. Supply can be stabilized and usability can be improved. Moreover, since heat can always be stored in the heat storage tank 28, solar heat with low energy density can be efficiently recovered.

(Embodiment 2)
In FIG. 4, the heat collecting section 4 is partitioned into a plurality of layers at both ends of the plurality of heat collecting pipes 5, and the heat collecting pipes 5 communicate with each other, so that the plurality of heat collecting pipes 5 are combined into one path. The inlet side communication part 29 and the outlet side communication part 30 are provided so that it may comprise.

  The inlet side communication portion 29 and the outlet side communication portion 30 are partitioned by a double room, and a first chamber 31 through which the heat medium 6 enters and exits and a second chamber 32 through which the plurality of heat collecting tubes 5 communicate with each other are provided. ing.

  The inlet side communication portion 29 and the outlet side communication portion 30 are formed in a cylindrical shape and are made of a material having good heat conductivity (for example, copper, brass, aluminum, etc.), and the same selective absorption film as the heat collecting tube 5 is formed on the surface thereof. Is forming.

  In the case of the heat collecting pipe 5 on the inlet side 7, the communication structure of the plurality of heat collecting pipes 5 is the inlet pipe 33 with the heat collecting pipe 5 (the inlet pipe 33 extends outside the heat collector 25 and is connected to the circuit 27. In addition, the portion of the inlet pipe 33 exposed in the parabolic reflector 1 forms the same selective absorption film as the heat collecting pipe 5) communicates with the first chamber 31 of the inlet side communication portion 29. is doing.

The heat collecting tube 5 on the inlet side 7 penetrates without communicating with the second chamber 32 of the inlet side communication portion 29 and communicates with the second chamber 32 of the outlet side communication portion 30, and this second chamber. The middle 9 and the middle 9 heat collecting tubes 5 are provided toward the inlet side communication portion 29.

  The middle 9 heat collecting tube 5 communicates with the heat collecting tube 5 on the outlet side 8 in the second chamber 32 of the inlet side communication portion 29, and the heat collecting tube 5 on the outlet side 8 is provided toward the outlet side communication portion 30. Yes.

  The heat collecting tube 5 on the outlet side 8 penetrates without communicating with the second chamber 32 of the outlet side communication portion 30 and communicates with the first chamber 31. In the first chamber 31, the heat collecting pipe 5 and the outlet pipe 34 on the outlet side 8 (the outlet pipe 34 is extended to the outside of the heat collector 25 and connected to the circuit 27. The portion exposed in the reflecting mirror 1 is configured such that the same selective absorption film as the heat collecting tube 5 is formed).

  About the heat collector comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  The heat medium 6 sent to the heat collector 25 via the circuit 27 by the circulation pump 26 passes through the heat collecting pipe 5 on the inlet side 7 from the first chamber 31 of the inlet side communication portion 29 through the inlet pipe 33, and then on the outlet. From the second chamber 32 of the side communication part 30 through the middle nine heat collecting pipes 5, the second room 32 of the inlet side communication part 29 is sent to the heat collecting pipe 5 on the outlet side 8, and from the outlet pipe 34 to the circuit 27. It is discharged and heated by the heat collector 25 during this time.

  At this time, the heat medium 6 supplied to the heat collecting tube 5 on the inlet side 7, the heat collecting tube 5 on the middle 9, and the heat collecting tube 5 on the outlet side 8 is the same as the sunlight concentrated on the focal point 2 of the parabolic reflector 1. In addition, when traveling around just above the focal point, direct sunlight is also received in the same manner so that sunlight under the same conditions is received and the temperature of the heat medium 6 is uniformly heated to a high temperature.

  As described above, in the present embodiment, the plurality of heat collecting tubes 5 are arranged at an equal distance from the focal point 2 by the inlet side communication portion 29 and the outlet side communication portion 30, rather than bending the heat collection tube 5. The distance can also be set small, the heat collecting part 4 can be configured compactly, and can be easily accommodated in the exterior 22.

  In addition, the inlet-side communication portion 29 and the outlet-side communication portion 30 of the present embodiment can change the flow of the heat medium 6 to promote mixing and make the temperature distribution uniform.

(Embodiment 3)
In FIG. 5, the heat collecting section 4 has a cylindrical permeation tube 35 disposed around it, and the periphery of the plurality of heat collecting tubes 5 has a sealed structure. The transmission tube 35 is formed of a glass tube having a high solar radiation transmittance (for example, the transmittance is about 90% in the case of transmission glass or quartz glass). The inside of the permeation tube 35 is kept in a vacuum to prevent heat radiation from the heat collecting tube 5 due to convection.

  As a method of keeping the inside of the permeation tube 35 in a vacuum, the sealed structure is maintained by the O-ring 36 using the inlet side communication portion 29 and the outlet side communication portion 30.

  About the heat collector comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  While the heat medium 6 sent to the heat collector 25 via the circuit 27 by the circulation pump 26 flows through the inside of the heat collecting pipe 5, the perimeter of the heat collecting pipe 5 is kept in vacuum by the permeation pipe 35, and the heat collecting pipe Since heat dissipation loss due to convection from 5 is prevented, it is discharged from the heat collector 25 to the circuit 27 while maintaining a high temperature.

As described above, in the present embodiment, since the air collecting layer 5 is evacuated and the air layer is eliminated, heat dissipation due to convection from the heat collecting tube 5 to the transmission tube 35 is prevented, and the heat collecting efficiency of the heat collecting unit 4 is reduced. Can be improved.

  Even if an inert krypton gas having a thermal conductivity smaller than that of air is injected into the inside of the permeation tube 35 of this embodiment, heat radiation from the heat collecting tube 5 can be prevented. In this case, since the strength of the permeation tube 35 is not as high as that of a vacuum, it is possible to use a resin tube (for example, polycarbonate) having high transparency.

(Embodiment 4)
6 (a) and 6 (b), the heat collecting section 4 increases the contact area of the outer wall 37 when the outer wall 37 of each of the heat collecting tubes 5 contacts the plurality of heat collecting tubes 5 around the focal point 2. In order to achieve this, a flat surface portion 38 is configured and arranged on the heat collecting tube 5.

  The heat collecting tube 5 on the inlet side 7, the heat collecting tube 5 on the middle 9, and the heat collecting tube 5 on the outlet side 8 are brought into contact with the respective flat portions 38 near the focal point 2 of the parabolic reflector 1, so that the focal point 2. The sunlight is received at a position where the sunlight is more concentrated. FIG. 6A shows an odd number arrangement, and FIG. 6B shows an even number arrangement.

  About the heat collector comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  The heat medium 6 sent to the heat collector 25 via the circuit 27 by the circulation pump 26 flows through the inside of the heat collection pipe 5, while the heat collection pipe 5 on the inlet side 7, the heat collection pipe 5 on the middle 9, and the outlet side 8. Even if the heat receiving tube 5 receives sunlight and the temperature varies, more heat is transmitted through the flat portion 38 provided on the outer wall 37 that is in contact with the heat collecting tube 5 so that the temperature is uniform. .

  The heat medium 6 is discharged from the heat collector 25 to the circuit 27 while keeping the high temperature uniform.

  As described above, in the present embodiment, since the flat portions 38 of the heat collecting tubes 5 are brought into contact with each other, the portions of the plurality of heat collecting tubes 5 that do not receive the concentrated sunlight reflected by the parabolic reflector 1. The temperature reduction can be prevented, the temperature of the plurality of heat collecting tubes 5 can be made uniform, and the heat collecting efficiency of the heat collecting unit 4 can be improved.

  Moreover, since the heat collecting tube 5 of the present embodiment is installed at a location closer to the focal point 2 in contact with the flat portion 38 of the heat collecting tube 5, sunlight is condensed and the heat medium 6 can be heated to a high temperature. .

  As described above, the heat collector according to the present invention is provided with a configuration in which a plurality of heat collecting tubes are spirally wound around the focal point of the parabolic reflector, and the plurality of heat collecting tubes are A portion where sunlight is always condensed can be configured, and the heat collection efficiency can be improved by reducing the heat radiation from the heat collection section, so that it can be applied to a hot water supply or a heating device for power generation in a house.

Sectional drawing of the front of the heat collector in Embodiment 1 of the present invention Sectional drawing of the side surface of the drive part vicinity of the heat collector in Embodiment 1 of this invention Sectional drawing and top view of the side which show arrangement | positioning of the heat collecting tube in Embodiment 1 of this invention Sectional drawing of the side surface of the other heat collector in Embodiment 2 of this invention Sectional drawing of the front of the other heat collector in Embodiment 3 of this invention Sectional drawing of the side surface of the other heat collector in Embodiment 4 of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Parabolic reflecting mirror 2 Focus 4 Heat collecting part 5 Heat collecting tube 6 Heat medium 11 Drive part 12 Actuating part 22 Exterior 23 Transmitter 25 Heat collector 25

Claims (7)

A parabolic reflector for collecting sunlight, a plurality of heat collecting tubes through which a heat medium provided around the focal point of the parabolic reflecting mirror, and a plurality of the heat collecting tubes around the focal point A heat collector comprising a heat collecting section that is spirally wound, and an exterior housing these parabolic reflecting mirrors and the heat collecting section. The heat collector according to claim 1, wherein the heat collecting section has a plurality of heat collecting tubes arranged at an equal distance from the focal point of the parabolic reflector. The heat collector according to claim 1 or 2, wherein the heat collecting section has a plurality of heat collecting tubes arranged so that the outer walls of the respective heat collecting tubes are in contact with each other around the focal point. The heat collecting part is partitioned into a plurality of layers at the ends of the plurality of heat collecting pipes, and the respective heat collecting pipes communicate with each other so that the plurality of heat collecting pipes are configured in one path. The heat collector according to any one of claims 1 to 3, wherein an outlet communication portion is provided. The heat collecting unit according to any one of claims 1 to 4, wherein the heat collecting unit includes a cylindrical permeation tube disposed around the heat collecting tube and has a sealed structure around the heat collecting tube. The heat collecting part is arranged such that a plurality of heat collecting tubes are arranged in a flat portion on the heat collecting tube in order to increase the contact area of the outer wall when the outer walls of the respective heat collecting tubes are brought into contact with each other around the focal point. The heat collector of any one of -5. A heat collection unit, a rotation support unit that supports the parabolic reflector so that the parabolic reflector can rotate around the focal point of the parabolic reflector, and a drive unit that rotates the parabolic reflector; The heat collector according to any one of claims 1 to 6, comprising a control unit for controlling the drive unit, and the heat collection unit, a parabolic reflector, and an exterior housing the drive unit.

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