JP2008138899A - Solar collector - Google Patents

Abstract

[PROBLEMS] To maximize the amount of heat collected by always directing the reflector of the heat collector toward the sun so that it can be installed as a roofing material in a house, and efficiently generate the heat necessary for heating the heat medium from sunlight. The purpose is to collect.
A plurality of light receiving amount sensors 5 and 6 provided on a surface perpendicular to a rotation axis are configured with the direction of the light receiving surface tilted. Change, the direction of the collector and the direction of the sun can be discriminated and the collector can be directed to the sun so that the amount of heat collection is maximized and the efficiency of the solar collector can be improved. Compactness and simplification can be achieved.
[Selection] Figure 1

Description

  The present invention relates to a solar heat collector that collects solar heat and takes it out as a high-temperature heat medium.

  As shown in FIG. 3, a conventional solar heat collector of this type has a heat collecting tube 102 disposed at the focal point of a saddle-shaped elongated condensing reflector 101 having a cross-section of a compound paraboloid (CPC). 3 are arranged side by side, and each heat collecting pipe 2 is connected by a heat medium pipe 4 to form a pipe line connecting the heat medium inlet 5 to the heat medium outlet 6 into one. .

  Further, the opening side of the condensing reflector 1 is covered with a light transmitting body 104 and the other part is covered with a casing 105 to form a sealed space so that outside air does not come into contact with the heat collecting tube 2.

  The solar heat passes through the light transmitting body 104, is reflected by the condensing reflecting mirror 101, and is collected in the heat collecting tube 2 arranged at the focal point. The collected solar heat is absorbed at the surface of the heat collecting tube 102 and heats the heat medium therein.

  That is, the heat medium flowing from the heat medium inlet 106 to the heat collecting tube 102 is heated and can be taken out from the heat medium outlet 107. At this time, since the heat collecting tube 102 is at a high temperature, heat is radiated to the surrounding gas, but the inside is sealed by the light transmitting body 104 and the casing 105, so that heat is radiated to the outside by convection. Suppressed.

  Further, while transmitting most of the sunlight with the light transmitting body 104, most of the infrared wavelengths radiated from the heat collecting tube 102 that has become high temperature are not transmitted to the outside, thereby suppressing heat radiation to the outside. .

  Thus, it is set as the efficient solar heat collector by taking in solar heat well and suppressing the heat dissipation loss of the converted heat to the exterior (for example, refer to patent documents 1).

  Moreover, in order to condense solar heat efficiently, it is necessary for the condensing reflector to always face the sun correctly.

  For this reason, as shown in FIG. 4, as a conventional automatic solar tracking device, sunlight is collected by a Fresnel lens, and an optical fiber 108 is provided in the light collecting portion to guide it to a place where it is used. An ascending fine adjustment sensor 109 and a descending fine adjustment sensor 110 for detecting the amount of light are provided in the vicinity of the condensing portion of the optical fiber 108.

As the sun moves, the condensed sunlight falls off the focus optical fiber 108 and when it hits the fine adjustment sensor 109 or the fine adjustment sensor 110, the fine adjustment circuit is operated to adjust the condensing location. It moves so as to eliminate the difference between the output of the adjustment sensor 109 and the output of the descending fine adjustment sensor 110, and sunlight can always be collected on the optical fiber 108 at the condensing place (see, for example, Patent Document 2).
JP 2002-228271 A JP-A-9-229669

  However, in the prior art, sunlight is collected in a heat collecting tube with a condenser reflector and heated while flowing a heat medium, so that heat can be efficiently collected and used at a high temperature. In order to efficiently collect solar heat, it is essential that the condenser reflector always faces the sun correctly.

  For this reason, a fine adjustment sensor for detecting the amount of light is provided in the vicinity of the condensing unit, and when the collected sunlight deviates from the focal point and hits the fine adjustment sensor, the incident direction of the sun is adjusted by moving each time. Can be adapted.

  However, tracking is not possible when the direction of the sun and the direction of the optical axis of the fringel lens differ significantly, such as after it has been cloudy for a while.

  In addition, in order to always track, in order to search the direction of the sun from the output change of the fine adjustment sensor by raising and lowering the light collecting part, it is necessary to always raise and lower the light collecting part. Two fine adjustment sensors are provided and stopped while the direction of the sun moves between them. Therefore, the direction of condensing and the direction of the sun cannot always be matched, the amount of heat collection decreased, and there was a problem that the efficiency as a solar heat collector deteriorated.

  This invention solves the said conventional subject, and aims at provision of the solar-heat collector which can always discriminate | determine the position direction of a reflecting mirror and the sun from light reception amount sensor output.

  In order to solve the above-described conventional problems, a solar heat collector of the present invention includes a reflecting mirror that collects sunlight, a heat collecting portion provided in the reflecting mirror, and the heat collecting portion as a center of rotation. A rotation driving unit supported so that the reflecting mirror can be rotated around, a plurality of light receiving amount sensors provided on a surface perpendicular to the rotation axis of the rotation driving unit, and the light receiving amount sensor inclining the direction of the light receiving surface Is configured.

  The solar heat collector of the present invention has a plurality of light receiving amount sensors provided on a surface perpendicular to the rotation axis, and the direction of the light receiving surface is widened. Therefore, the output value of each light receiving amount sensor varies depending on the direction of the sun. Therefore, the direction of the collector and the direction of the sun can be discriminated. By rotating the rotating shaft, the collector can be directed to the sun so that the amount of heat can be maximized and the efficiency of the solar collector can be improved. Thus, the solar heat collector can be made compact and simplified.

  The first invention is a reflecting mirror for condensing sunlight, a heat collecting part provided on the reflecting mirror, and a rotation supporting the collecting mirror around the heat collecting part so that the reflecting mirror can rotate. A plurality of light receiving amount sensors provided on a surface perpendicular to the rotation axis of the rotation driving unit, and the light receiving amount sensor is configured by inclining the direction of the light receiving surface; By changing the output value of each received light amount sensor, the direction of the heat collector and the direction of the sun can be discriminated, and by rotating the rotating shaft, the heat collector can be directed toward the sun, so the amount of heat collected is maximized. And the efficiency of the solar heat collector can be improved.

  That is, sunlight is reflected once or a plurality of times by the reflecting mirror and absorbed at the surface of the heat collecting part and converted into heat energy, heating the heat medium in the heat medium pipe and raising the temperature of the heat medium. Since this thermal energy increases or decreases depending on the amount of sunlight entering the reflecting mirror, it is a point to obtain the maximum heat amount by always facing the reflecting mirror to the sun. The altitude and direction of the sun change according to the season and time.

  Therefore, a plurality of light receiving sensors are provided on a surface perpendicular to the rotation axis, and the direction of the light receiving surface is widened so that the direction of the sun and the direction of the reflecting mirror are on the surface perpendicular to the rotation axis. Can be determined. The output of the received light amount sensor is maximized when the direction of the sun and the direction of the light receiving surface coincide with each other.

  Therefore, the direction of the sun with respect to the reflecting mirror can be specified from the change in the output value of the plurality of received light amount sensors that are spread with respect to the optical axis of the reflecting mirror. For this reason, the operation | movement which always faces a reflecting mirror to the sun is attained, and since a heat collector can be faced toward the sun, the amount of heat collection can be maximized and the efficiency of a solar heat collector can be improved.

  Further, increasing the amount of condensed light and heating the heat medium more can increase the temperature of the heat medium and increase the outlet temperature of the heat medium. For this reason, the solar heat collector can be made compact and simplified by utilizing the improved performance.

  In the second invention, in particular, the operation unit for comparing the outputs of the plurality of received light amount sensors according to the first invention provides an output value of the received light amount sensor when the optical axis of the reflecting mirror coincides with the direction of the sun. By rotating the rotation drive unit so that this value becomes equal to that of the light, the direction of the sun can be accurately determined by comparing the magnitude values of the outputs of the respective received light amount sensors.

  In other words, the light receiving amount sensor is configured so that the direction of the light receiving surface is widened with respect to the optical axis of the reflecting mirror, so that when the optical axis of the reflecting mirror matches the direction of the sun, the light receiving surface of the light receiving amount sensor is the direction of the sun. It is placed leaning. Therefore, the output of each received light amount sensor has a magnitude corresponding to the inclination. For this reason, the positional relationship between the light receiving sensor and the sun is fixed, and the positional relationship between the sun and the reflecting mirror is known. By rotating the rotation driving unit in accordance with this change, it is possible to sequentially turn the reflecting mirror toward the sun.

  In the third aspect of the invention, in particular, the reflecting mirror of the first aspect of the invention is a quadric surface formed of a bowl-shaped parabola, and the directions of the light receiving surfaces of the plurality of light receiving amount sensors are inclined at an equal angle with respect to the axis of the parabola By configuring as above, the direction of the reflecting mirror and the sun can be surely matched by the operation in one direction.

  That is, by making the reflecting mirror a quadratic curved surface made of a saddle-shaped parabola, when the sun is tilted in the direction of the saddle that is perpendicular to the axis of the parabola, the reflecting mirror is refracted obliquely. It reaches the heat collecting part.

  Therefore, the sun and the reflecting mirror can be directed forward by matching the direction of the sun and the axis of the parabola, and the tracking mechanism is simplified. Furthermore, since the direction of the light receiving surface of the light receiving amount sensor is configured to extend at an equal angle with respect to the axis of the parabola, the reflecting mirror and the plurality of light receiving amount sensors are positioned at the same interval in the sun direction.

  Since the output of the received light amount sensor increases or decreases depending on the inclination with the sun direction, the output of the plurality of received light amount sensors is the same when the axis of the parabola coincides with the sun direction.

  In this way, the positional relationship between the sun and the reflecting mirror is always known, and the reflecting mirror can be always directed toward the sun by rotating the rotation driving unit.

  According to a fourth aspect of the invention, in particular, a storage control unit that stores an operation angle obtained by rotating the rotation drive unit and calculates the operation angle per time by the calculation unit of the first invention, and the storage control unit include: While sequentially rotating the rotation drive unit in advance according to the operating angle value per time, while correcting the rotation of the rotation drive unit so that the output value of the light receiving amount sensor becomes equal, the sun direction is sequentially tracked The rotational power of the rotational drive unit can be reduced.

  That is, since the movement of the sun of the day moves at a roughly fixed speed, the operation angle obtained by rotating the rotation drive unit by the calculation unit is stored as a change due to the movement of the sun, and the next approximate Since the amount of motion can be estimated and controlled, the reflector can be reliably aligned with the sun simply by making fine adjustments from the output value of the received light amount sensor.

  For this reason, the rotation operation of the rotation drive unit is reduced, and the reliability of the tracking operation can be improved and the tracking power can be reduced.

  In the fifth aspect of the invention, in particular, the plurality of reflecting mirrors of the first aspect of the invention are provided, and the heat collecting unit communicates an integrated heat collecting tube into the plurality of reflecting mirrors so as to circulate the heat medium therein. By arranging, the heat medium is heated by sunlight concentrated while passing through the respective reflecting mirrors, so that a predetermined amount of heat can be obtained while maintaining the temperature of the heat medium at a high temperature.

  In the sixth aspect of the invention, in particular, the heat collecting part of the first invention is equipped with a selective absorption film that absorbs infrared rays on the surface thereof, thereby preventing infrared radiation from the heat collecting part and thereby controlling the temperature of the heat collecting part. The heat can be efficiently transferred to the heat medium while maintaining a high temperature.

  In the seventh invention, in particular, the exterior of the first invention is made by injecting a gas with low thermal conductivity inside and sealing it, thereby greatly reducing the heat radiation by convective heat transfer of air in the exterior, Heat dissipation efficiency can be improved by reducing heat radiation from the exterior.

(Embodiment 1)
1 and 2, reference numeral 1 denotes a reflector that collects solar heat. The shape of the reflector is a quadratic curved surface whose section is a parabola to focus the solar heat on the heat collector 2, and the vertical direction is It is configured in a bowl shape. That is, this bowl-shaped reflecting mirror 1 is extended in the azimuth direction (east-west direction) to constitute one reflecting mirror unit.

  The reflecting surface 3 of the reflecting mirror 1 is finished to be a mirror surface in order to improve the solar heat reflectance. In the mirror finishing of the reflecting surface 3, a reflecting layer is formed by a method such as plating, vapor deposition, polishing, painting, or the like using a material constituting the reflecting mirror 1.

  Processing of the reflecting mirror 1 includes methods such as molding of heat-resistant resin (for example, phenol resin, fluororesin, polyimide resin, etc.), stainless steel press processing, and aluminum die casting.

  There is also a method of bending an aluminum mirror finish plate. For example, when the reflecting mirror 1 is molded from a heat-resistant resin, the reflecting surface 3 is formed by finishing the mirror surface with aluminum plating (evaporation) or painting. In particular, when the mirror surface is plated with aluminum, polyimide resin, polyphenylene sulfide resin, polyester resin, polyamide resin, or the like is used.

  When stainless steel is pressed, a mirror surface may be formed by aluminum electrolytic polishing or buffing. Even in the molding of aluminum die casting, mirror finishing may be performed by plating or the like to prevent a decrease in reflectance due to an oxide film after polishing of the aluminum die casting material.

  The heat collecting unit 2 is disposed at the focal point of the paraboloid of the reflecting mirror 1 and is composed of a tube (a copper tube, a stainless tube, a brass tube, an aluminum tube, or the like).

Since the parabolic reflector 1 focuses only on sunlight in one direction, in order to concentrate solar heat on the heat collecting section 2, it is necessary to irradiate vertical sunlight on the bowl-shaped reflector 1 There is. In order to match the characteristics of the parabolic reflecting mirror 1, a rotation driving unit 4 for rotating the reflecting mirror 1 around the heat collecting unit 2 is provided.

  The rotation driving unit 4 rotates a driving unit working plate mounted on a shaft by combining a motor, a gear and a cam, and the reflecting mirror 1 is integrated with the driving unit working plate so as to rotate coaxially with the heat collecting tube 2. Wearing. Moreover, the rotation drive part 4 can be set to a free angle using a stepping motor.

  5 and 6 are received light amount sensors whose output increases or decreases depending on the amount of light of the sun, and are installed at both ends of the reflecting mirror 1 which is a surface perpendicular to the rotation axis of the rotation driving unit 4. The direction is inclined outward.

  In the present embodiment, the received light amount sensor 5 has an angle α and the received light amount sensor 6 has an angle β with respect to a line parallel to the optical axis 7 of the reflecting mirror 1, which is a surface perpendicular to the rotation axis of the rotation drive unit 4. It is only tilted outward.

  Moreover, the calculating part 8 which compares the output of the light-receiving-amount sensors 5 and 6 was provided. The calculation unit 8 is configured to rotate the rotation drive unit 4 so that this value is equal to the output value of the received light amount sensors 5 and 6 when the optical axis of the reflecting mirror 1 coincides with the sun direction.

  A storage control unit 9 is provided that stores an operation angle obtained by rotating the rotation drive unit 4 by the calculation unit 8 and calculates the operation angle per time. The storage control unit 9 corrects the rotation of the rotation driving unit 4 so that the output values of the received light amount sensors 5 and 6 become equal while sequentially rotating the rotation driving unit 4 in advance with the operation angle value per time.

  Reference numeral 10 denotes a heat medium supplied to the inside of the heat collecting unit 2, which uses alternative chlorofluorocarbon (HFC) 134 a, carbon dioxide (CO 2), or alcohols.

  The outer diameter of the tube of the heat collecting unit 2 is configured to be small so that the circulation of the heat medium 10 does not become a resistance, so that a large amount of sunlight can be concentrated on the heat collecting unit 2. The smaller the outer diameter of the tube, the higher the condensing ratio (the value obtained by dividing the focal area by the incident area of sunlight, in the vertical type, the value obtained by dividing the outer diameter of the focal tube by the aperture width of the reflector) and the heat collecting part 2 can be hot.

  A selective absorption film is formed on the surface of the heat collecting unit 2 (not shown). The selective absorption film is plated with black black chrome or electroless nickel on the surface of the heat collecting section 2. Of course, a manganese black paint may be applied instead of plating.

  Reference numeral 11 denotes an exterior housing the reflecting mirror 1 and the heat collecting section 2 and is configured in a box shape having a transmissive body 12 provided on the top. The exterior 11 is made of stainless steel with little corrosion or a weather resistant resin material (for example, polyester resin, polycarbonate resin, etc.). The exterior 11 is filled with an exterior insulation material 13.

  The exterior heat insulating material 13 is made of heat-resistant rock wool, glass wool or the like, and its surface is hardened to form a wall surface by itself or to reinforce the inner surface with a plate.

  The transparent body 12 is provided on the upper part of the reflecting mirror 1 to capture sunlight and prevent rain and dust from entering the inside of the reflecting mirror 1, and a transparent glass having a high transmittance for allowing sunlight to pass through. (The solar transmittance of such transparent glass is about 90%).

  The reflecting mirror 1 is curved so as to spread upward toward the transmitting body 12 so that a large amount of sunlight can be received in accordance with the altitude of the sun.

  14 is a circulation pump of the heat medium 10, 15 is a circuit through which the heat medium 10 flows, and 16 is a heat storage tank for storing high-temperature heat of the heat medium 10.

  The operation and action of the above configuration will be described below.

  The circulation pump 14 is operated to circulate the heat medium 10 in the circuit 15 and send it to the heat collecting unit 2. Sunlight is reflected by the reflecting surface 3 of the reflecting mirror 1 and concentrated on the heat collecting section 2 to increase its temperature. About 90% of sunlight is absorbed by the heat collection unit 2 by the selective absorption film attached to the surface of the heat collection unit 2, and the temperature of the heat collection unit 2 rises. The heat medium 10 sent to the heat collecting unit 2 forms a high-temperature liquid or vapor (or liquid or a mixture of vapor and liquid) and is sent to the heat storage tank 16.

  The heat storage tank 16 receives the liquid or vapor and accumulates a heat amount of about 200 ° C. The liquid or vapor of the heat medium 16 is condensed in the heat storage tank 16 to become a liquid, and is sent again to the heat collecting unit 2 by the circulation pump 14 to be heated.

  This operation is repeated while solar heat can be supplied, so that a necessary amount of heat is stored in the heat storage tank 16.

  The amount of sunlight collected by the heat collector is greatly influenced by the amount of sunlight entering the reflector 1, and is maximized when the direction of the sun and the direction of the reflector 1 coincide with each other. It becomes quantity.

  Therefore, the reflecting mirror 1 is supported by the rotation driving unit 4 so that the heat collecting unit 2 can be rotated. Since a plurality of light reception amount sensors 5 and 6 provided on a surface perpendicular to the rotation axis of the rotation drive unit 4 change the direction of the light reception surface, the output value changes depending on the direction of the sun.

  For this reason, the direction of the heat collector and the direction of the sun can be discriminated, and by turning the reflecting mirror 1, the heat collector can be directed forward toward the sun, the amount of heat collection is maximized, and the solar heat collector The efficiency can be improved.

  That is, sunlight is reflected once or a plurality of times by the reflecting mirror 1 and absorbed on the surface of the heat collecting unit 2 to be converted into heat energy, heating the heat medium 10 of the heat medium pipe and raising its temperature.

  Since this thermal energy increases or decreases depending on the amount of sunlight entering the reflecting mirror 1, it is the point to obtain the maximum amount of heat that the reflecting mirror 1 always faces the sun.

  The altitude and direction of the sun change according to the season and time. Therefore, a plurality of light receiving sensors 5 and 6 are provided on a surface perpendicular to the rotation axis, and the direction of the light receiving surface is inclined with respect to the rotation axis by α and β, respectively. The direction of the sun and the direction of the reflecting mirror 1 can be discriminated on the surface.

  The outputs of the received light amount sensors 5 and 6 change according to the deviation of the sun direction, and the output is maximized when the sun direction and the light receiving surface coincide.

  Therefore, the direction of the sun with respect to the reflecting mirror 1 can be specified from the change in the output value of the plurality of received light amount sensors 5, 6 installed inclined with respect to the optical axis of the reflecting mirror 1.

  As a result, the operation of always directing the reflecting mirror 1 toward the sun is possible, and since the heat collector can be directed to the sun, the amount of heat collection can be maximized and the efficiency of the solar heat collector can be improved.

  In addition, the amount of collected light increases and the heat medium 10 can be heated more. This makes it possible to increase the temperature of the heat medium 10 and raise the outlet temperature thereof. Therefore, the solar heat collector can be made compact and simplified by using the improved performance, and the cost can be reduced by simplifying the components and control.

  The calculation unit 8 is configured to rotate the rotation driving unit 4 so that the values are equal to the output values of the light receiving amount sensors 5 and 6 when the optical axis of the reflecting mirror 1 coincides with the sun direction. The magnitude values of the outputs of the received light amount sensors 5 and 6 can be compared, whereby the direction of the sun can be determined accurately.

  That is, the received light amount sensors 5 and 6 are configured so that the direction of the light receiving surface is inclined with respect to the optical axis of the reflecting mirror 1, so that when the optical axis of the reflecting mirror 1 coincides with the direction of the sun, The light-receiving surface is inclined with respect to the sun. For this reason, the outputs of the received light amount sensors 5 and 6 have a magnitude corresponding to the inclination.

  Thereby, the positional relationship between the light receiving sensors 5 and 6 and the sun is fixed, and the positional relationship between the sun and the reflecting mirror 1 is known. By rotating the rotation drive unit 4 in accordance with this change, the reflecting mirror 1 can be sequentially directed toward the sun.

  The reflecting mirror 1 is a quadratic curved surface made of a bowl-shaped parabola, and the directions of the light receiving surfaces of the plurality of light receiving amount sensors 5 and 6 are configured to extend at an equal angle with respect to the axis of the parabola (angle α = β), the direction of the reflecting mirror 1 and the sun can be surely coincided with each other in one direction of operation. That is, by making the reflecting mirror 1 into a quadratic curved surface made of a saddle-shaped parabola, the reflecting mirror 1 is refracted obliquely when the sun is tilted in the soot direction perpendicular to the parabola axis. While reaching the heat collecting section 2.

  Therefore, the sun and the reflecting mirror can be directed forward by matching the direction of the sun and the axis of the parabola, and the tracking mechanism is simplified.

  Furthermore, the direction of the light receiving surface of the light receiving amount sensors 5 and 6 is configured so as to extend at an equal angle with respect to the axis of the parabola, so that the reflecting mirror 1 and the light receiving amount sensors 5 and 6 are spaced apart from each other in the direction of the sun. To position. Since the outputs of the received light amount sensors 5 and 6 increase or decrease depending on the inclination with the sun direction, the outputs of the received light amount sensor 5 and the received light amount sensor 6 are the same when the axis of the parabola coincides with the sun direction. Thus, the positional relationship between the sun and the reflecting mirror 1 is always known, and by rotating the rotation driving unit 4, the reflecting mirror 1 can always be directed toward the sun.

  In addition, the calculation unit 8 stores the operation angle obtained by rotating the rotation drive unit 4 and calculates the operation angle per time. The storage control unit 9 sequentially calculates the rotation angle by the operation angle value per time in advance. , The rotation of the rotation drive unit 4 is corrected so that the output values of the received light amount sensors 5 and 6 become equal.

  As a result, the rotational power of the rotational drive unit 4 can be reduced while sequentially tracking the direction of the sun. That is, since the movement of the sun of the day moves at a roughly fixed speed, a change due to the movement of the sun is stored as the operation angle obtained by rotating the rotation drive unit 4 by the calculation unit 8, and Approximate amount of motion can be estimated and controlled.

Therefore, the reflective mirror 1 can be reliably aligned with the sun only by fine adjustment from the output values of the received light amount sensors 5 and 6. For this reason, the rotation operation of the rotation drive unit 4 is reduced, and the reliability of the tracking operation can be improved and the tracking power can be reduced.

  In the present embodiment, only one reflecting mirror 1 and one heat collecting part 2 are provided. However, a plurality of reflecting mirrors 1 are provided, and the heat collecting part 2 is integrated to circulate the heat medium 10 therein. By arranging the heat collecting tubes in communication with the plurality of reflecting mirrors (not shown), the heat medium 10 is heated by sunlight concentrated while passing through the respective reflecting mirrors 1. A predetermined amount of heat can be obtained while maintaining a high temperature.

  Further, the heat collecting part 2 is provided with a selective absorption film that absorbs infrared rays made of a heat-resistant and weather-resistant resin material (for example, polycarbonate, etc.) having selective permeation performance on the surface. Infrared radiation is prevented, the temperature of the heat collecting part 3 is maintained at a high temperature, and the heat can be efficiently transmitted to the heat medium 10, thereby reducing the weight and cost.

  Further, the exterior 11 is sealed with a transmissive body 12, and a gas having a low thermal conductivity (for example, krypton gas) is injected into the interior 11 and sealed. As a result, heat radiation due to convective heat transfer of air in the exterior 11 can be greatly reduced, heat radiation from the exterior 11 can be reduced, and heat collection efficiency can be improved.

  And since the exterior body 11 mounts | transmits the transmission body 12 in the side by which the reflecting mirror 1 was opened, since rainwater and dust do not accumulate in the exterior body 11, heat collection efficiency can be maintained favorable over a long period of time. And the high temperature heat collection part 2 is covered, safety | security is improved, deterioration of the exterior heat insulating material 13 is prevented, and it is made to endure long-term use.

  In the present embodiment, two received light amount sensors are shown. However, the number of received light amount sensors may be four or six as long as it is plural. If the number of received light quantity sensors is increased, finer control and improved reliability can be achieved. Even if the position of the light receiving amount sensor is not close to both ends of the reflecting mirror 1 but is kept close to the angle of the light receiving surface, the same performance can be obtained. Cost reduction can also be realized.

  As described above, the heat collector according to the present invention tracks the sunlight so that the reflector is always directed to sunlight, and recovers heat from sunlight with low energy density to perform efficient heat exchange. Therefore, it can be applied to a heating device for hot water supply or power generation in a house.

Sectional drawing of the solar-heat collector in Embodiment 1 of this invention Perspective view of the main part of the solar collector Perspective view of solar collector in conventional example Partial sectional view of an automatic solar tracking device in another conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reflecting mirror 2 Heat collecting part 4 Rotation drive part 5, 6 Light reception amount sensor 8 Calculation part 9 Storage control part 10 Heat medium

Claims (7)

Reflector that collects solar heat, a heat collector provided in the reflector, a rotation drive unit that supports the heat collector so that the reflector can rotate around the center of rotation, and the rotation drive And a plurality of received light amount sensors provided on a surface perpendicular to the rotation axis of the unit, wherein the received light amount sensors have different heat receiving surface directions. A calculation unit for comparing the outputs of a plurality of received light amount sensors is provided, and this calculation unit is equal to the output value of the received light amount sensor when the optical axis of the reflecting mirror coincides with the sun direction. The solar heat collector according to claim 1, wherein the rotation drive unit is rotated as described above. 2. The solar heat collector according to claim 1, wherein the reflecting mirror is a quadratic curved surface made of a bowl-shaped parabola, and the directions of the light receiving surfaces of the plurality of light receiving amount sensors are inclined at an equal angle with respect to the axis of the parabola. . A storage control unit for storing an operation angle obtained by rotating the rotation drive unit by the calculation unit and calculating the operation angle per time is provided, and the rotation drive unit is sequentially set in advance according to the operation angle value per time of the storage control unit. The solar heat collector according to claim 2, wherein the rotation of the rotation driving unit is corrected so that the output values of the received light amount sensors become equal while rotating. 2. The solar heat collector according to claim 1, wherein a plurality of reflecting mirrors are provided, and the heat collecting section is arranged such that an integral heat collecting tube is communicated with the plurality of reflecting mirrors so that the heat medium flows inside. The solar heat collector according to claim 1, wherein the heat collecting part is provided with a selective absorption film that absorbs infrared rays on a surface thereof. The solar heat collector according to claim 1, wherein the reflector and the heat collecting part are disposed in the exterior, and a gas having a low thermal conductivity is injected into the exterior and sealed.