JP5166004B2 - Pneumatic solar collector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pneumatic solar collector capable of producing warm air by utilizing sunlight, improving heat collecting efficiency, being miniaturized and easy in assembling work. <P>SOLUTION: This pneumatic solar collector has a hollow heat collection case 2 of which the top face is coated with a transmission body 21 having high sunlight transmittance, and a sheet-shaped heat collecting material 3 disposed in a state of being inclined to block the heat medium air flowing in the heat collection case 2, and having fine pores through which the heat medium air passes, and lower voids 31 having ventilation widths to allow the heat medium air to rise along a back face of the sheet-shaped heat collecting material 3 are formed at a lower portion of the sheet-shaped heat collecting material 3. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a pneumatic heat collecting technique for generating warm air using sunlight, and more particularly to a pneumatic solar heat collecting apparatus capable of realizing high efficiency and compactness of heat collecting efficiency.

  2. Description of the Related Art Conventionally, a pneumatic heat collecting apparatus that generates warm air using sunlight is known. For example, Japanese Patent Publication No. 8-6971 discloses a closed wind tunnel in which an outer peripheral surface is covered with a film having excellent sunlight transmittance and a heat insulating material layer is provided at the bottom, and sunlight transmitted through the wind tunnel. And a sheet-like heat collecting material provided with an inclination so as to block the air flow passing through the wind tunnel, and having a minute gap through which the heat transfer air can pass, and a solar light collecting surface in the wind tunnel An air heat collecting collector is disclosed in which a gap of 5 to 20% of the height of the wind tunnel is provided between the upper end of the heat collecting material and the heat collecting material (Patent Document 1).

  And, according to the description of Patent Document 1, the relatively low temperature airflow that flows through the heat collector upper layer portion by the gap forms a heat insulating layer, thus preventing heat dissipation from the sheet-like heat collector, It is said that heat collection efficiency is improved because turbulent flow is generated when the velocity of the air flow in the wind tunnel differs between the upper layer portion (portion without the heat collecting material) and the lower layer portion (heat collecting material portion).

Japanese Patent Publication No. 8-6971

  However, in the invention described in Patent Document 1, the heat collection efficiency is insufficient. That is, normally, the air heated by the heat collecting material tends to stay on the back side of the heat collecting material. However, as described above, even if a gap is provided only in the upper part of the heat collector, the problem is that the turbulent flow is generated only in the vicinity of the upper layer part, and the retained air on the heat collector back side cannot be effectively utilized. There is.

  On the other hand, there is also an idea that the stagnant air can be taken in by generating a larger air flow. However, in the conventional pneumatic solar heat collecting apparatus including the invention described in Patent Document 1, a fan is used as a means for generating an air flow. For this reason, in order to generate the turbulent flow enough to take in the staying air, a powerful fan must be used, and there is a problem that the initial cost and running cost are increased.

  Moreover, in the said patent document 1, as for the carbon fiber sheet illustrated as a heat collecting material, the straight carbon fiber is mainstream conventionally. Since this straight carbon fiber sheet has a low air permeability in the thickness direction, the pressure loss is large. Moreover, there is a large difference in characteristics between the surface direction and the thickness direction, and in particular, there is a problem that the thermal conductivity in the thickness direction is low.

  Furthermore, with regard to the pneumatic solar heat collecting apparatus, generally, the larger the wind tunnel (casing) capacity, the more air can be circulated, so the hot air generating ability is improved. For this reason, conventionally, in order to ensure the required performance in order to apply to heating applications for houses, drying applications for wood, etc., there is a problem that the casing has to be enlarged and the entire apparatus is enlarged. is there.

  The present invention has been made to solve such problems. In addition to being able to generate hot air using sunlight, it is possible to increase the efficiency of heat collection and to reduce the size and the assembly work. An object of the present invention is to provide a pneumatic solar heat collecting device that can be easily realized.

  A feature of the pneumatic solar heat collecting apparatus according to the present invention is to block a hollow heat collecting case whose upper surface is covered with a transparent body having excellent sunlight transmittance, and heat medium air flowing in the heat collecting case. And a sheet-like heat collecting material having a minute gap through which the heat-medium air can pass, and the heat-medium air is provided in the lower part of the sheet-like heat collecting material. The lower space | gap provided with the ventilation width | variety which can raise along the back surface of this is provided.

  Moreover, in this invention, it is preferable that the said sheet-like heat collecting material is a curved carbon fiber sheet formed by shape | molding the bent carbon fiber in a sheet form.

  Further, in the present invention, a plurality of heat collecting material support bars for supporting the sheet-shaped heat collecting material are alternately arranged in parallel on the inner wall surface of the heat collecting case. It is preferable that the sheet-like heat collecting material is stretched so as to form a substantially wave shape.

  In the present invention, it is preferable that the sheet-like heat collecting material is stretched so as to provide an upper gap that suppresses heat loss from the transmissive body.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to produce | generate warm air using sunlight, while being able to make heat collection efficiency highly efficient, it can implement | achieve compactization and the ease of an assembly operation.

  Hereinafter, a first embodiment of a pneumatic solar heat collecting apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a pneumatic solar heat collecting apparatus 1A of the first embodiment, and FIG. 2 is a cross-sectional view seen from the side.

  As shown in FIGS. 1 and 2, the pneumatic solar heat collecting apparatus 1A of the first embodiment mainly includes a heat collecting case 2 that collects thermal energy from sunlight using air as a heat medium, and the heat collecting case. 2 and a sheet-like heat collecting material 3 accommodated in the inside.

  The heat collection case 2 circulates heat medium air as a heat medium and collects heat energy from sunlight. In the first embodiment, the heat collection case 2 is made of an aluminum alloy, a steel sheet, wood, or the like, and is formed in a hollow, substantially rectangular parallelepiped shape as shown in FIGS. Further, the upper surface of the heat collecting case 2 is covered with a semi-tempered glass excellent in sunlight transmittance and a transparent body 21 such as polycarbonate in a sealed state. On the other hand, a heat insulating material 22 such as foamed urethane, foamed styrene, glass wool, or wood is laid on the bottom surface of the heat collecting case 2.

  As shown in FIGS. 1 and 2, the heat collection case 2 is formed with an intake port 23 on the downstream side surface in the longitudinal direction and an exhaust port 24 on the upstream side surface. Accordingly, for example, when the intake fan is driven on the exhaust port 24 side, the heat transfer air is taken in from the intake port 23 and an air flow flowing toward the exhaust port 24 is formed.

  The sheet-shaped heat collecting material 3 plays a role of collecting heat upon receiving sunlight and exchanging heat with the heat medium air. The sheet-like heat collecting material 3 has a minute gap through which heat medium air can pass. Moreover, in this 1st Embodiment, the sheet-like heat collecting material 3 is comprised from the curved carbon fiber sheet formed by shape | molding the bent carbon fiber in a sheet form. This curved carbon fiber sheet is formed into a sheet shape by adding a resin binder to a bent carbon fiber made from coal pitch, and then impregnated with a resin with a high carbonization rate. It has been processed.

  FIG. 3 shows an SEM (Scanning Electron Microscope) image (230 times) of the curved carbon fiber sheet used in the first embodiment. As shown in FIG. 3, each carbon fiber is curled in the curved carbon fiber sheet, and has excellent air permeability due to a three-dimensional fiber structure. Moreover, carbon fiber has an excellent thermal conductivity and is suitable as a heat exchange material. This curved carbon fiber sheet has an excellent performance, such as air permeability and thermal conductivity in the thickness direction of about twice that of a general straight carbon fiber sheet.

  However, in the embodiment according to the present invention, a curved carbon fiber sheet is used as the sheet-like heat collecting material 3, but the invention is not limited to this. A straight carbon fiber sheet or other heat collecting material may be used as long as it has microscopic voids through which it passes.

  Further, in the first embodiment, as shown in FIGS. 1 and 2, the plurality of sheet-like heat collecting materials 3 are provided so as to be inclined so as to block the heat transfer air flowing in the heat collecting case 2. Yes. Specifically, each sheet-like heat collecting material 3 is inclined at a predetermined angle with respect to the flow direction of the heat transfer air so as to block the flow of the heat transfer air while efficiently receiving sunlight, and A lower gap 31 having a predetermined width is formed between the lower portion and the bottom surface of the heat collecting case 2.

  In the first embodiment, the lower gap 31 secures a predetermined amount of heat medium air that passes through the sheet-shaped heat collector 3, and the heat medium air can rise along the back surface of the sheet-shaped heat collector 3. It is narrowed to an extremely fine ventilation width. If the ventilation width is too small, the heat medium air hardly flows into the lower gap 31, and there is no point in providing the gap, and the pressure loss cannot be reduced. On the other hand, when the ventilation width is too large, the tendency that the heat transfer air simply flows along the bottom surface of the heat collecting case 2 becomes strong. For this reason, the heat-medium air which passes the sheet-like heat collecting material 3 decreases, the heat collecting efficiency is reduced, and the warm heat-medium air staying on the back side of the sheet-like heat collecting material 3 cannot be peeled off.

  In the first embodiment, the lower gap 31 is formed between the bottom surface of the heat collecting case 2 and the lower end portion of the sheet-like heat collecting material 3, but the present invention is not limited to this. If the effect of the lower gap 31 described above can be obtained, for example, the lower end portion of the sheet-like heat collecting material 3 is brought into contact with the bottom surface of the heat collecting case 2, and an extremely thin slit is formed near the lower end of the sheet-like heat collecting material 3. You may make it comprise the lower space | gap 31 by forming.

  In the first embodiment, an upper gap 32 having a predetermined width is also provided between the upper end portion of each sheet-like heat collecting material 3 and the back surface of the transmission body 21. The upper gap 32 is set to a ventilation width that can suppress heat loss radiated to the outside through the transmissive body 21. This is because if each sheet-like heat collecting material 3 is in contact with or close to the transmissive body 21, it is forced to flow through natural convection or voids through ambient air due to heat conduction in the surface direction of the sheet-like heat collecting material 3. Heat transfer due to convection makes it easier for heat to move to the back side of the transmissive body 21. For this reason, the temperature of the transmissive body 21 rises and the amount of heat radiation to the surrounding air increases, resulting in an increase in the amount of heat loss.

  On the other hand, if the ventilation width of the upper gap 32 is too large, most of the air flow is guided to the upper gap 32, and the heat transfer air passing through the sheet-like heat collecting material 3 is reduced. There is a risk of it. Therefore, it is necessary to provide the upper gap 32 while adjusting the balance with the lower gap 31. However, considering each merit and demerit, only the lower gap 31 is formed, and the upper gap 32 may not be provided. For example, when this pneumatic solar heat collecting apparatus 1A is applied to a general house or the like, only the lower gap 31 may be provided without providing the upper gap 32 in order to reduce the thickness of the heat collection case 2.

  Next, the operation of the pneumatic solar heat collecting apparatus 1A according to the first embodiment having the above-described configuration will be described with reference to the drawings.

  First, when hot air is generated by the pneumatic solar heat collecting apparatus 1A of the first embodiment, a pneumatic solar heat collecting apparatus is applied so that sunlight is irradiated on the light receiving surface (upper surface) of the sheet-shaped heat collecting material 3. Install 1A. Thereby, since sunlight permeate | transmits the permeation | transmission body 21 and is irradiated to each sheet-like heat collecting material 3, each sheet-like heat collecting material 3 stores solar heat. Note that the heat collection efficiency is improved as the light receiving surface of the sheet-shaped heat collecting material 3 is made substantially perpendicular to the sunlight irradiation direction.

  Subsequently, when the intake fan is driven on the exhaust port 24 side of the heat collecting case 2, heat medium air is taken in from the intake port 23 and an air flow flowing toward the exhaust port 24 is formed. Thereby, since each sheet-like heat collecting material 3 allows the heat medium air to slowly pass through the minute gaps, heat exchange is promoted and the temperature of the heat medium air is effectively increased. Moreover, since each sheet-like heat collecting material 3 has high air permeability, pressure loss is reduced.

  In the first embodiment, as shown in FIG. 2, the moderately narrowed lower gap 31 guides the heat medium air so as to rise along the back surface of each sheet-like heat collecting material 3. Thereby, since the warm heat-medium air staying on the back surface of each sheet-like heat collecting material 3 moves so as to be peeled off, more effective heat collection is realized. Moreover, the lower space | gap 31 accelerates | stimulates the heat transfer by lower surface ventilation, and improves the whole heat collection efficiency. Furthermore, the lower space | gap 31 prevents that the heat conduction from the lower end part of each sheet-like heat collecting material 3 to the bottom face of the heat collecting case 2 becomes a heat bridge.

  On the other hand, the upper air gap 32 induces a larger amount of heat transfer air in the upper layer portion of the heat collecting case 2 to form a heat insulating layer. Thereby, heat dissipation from the sheet-like heat collecting material 3 is prevented and turbulent flow is generated in the heat transfer medium air, so that further heat collecting efficiency is expected.

  As described above, the heat medium air warmed in each sheet-like heat collecting material 3 is flowed to the exhaust port 24, and then the heat medium air for ventilation, heating, hot water supply, desiccant cooling of the house, or drying of wood It is effectively used as a heating medium air.

According to the pneumatic solar heat collecting apparatus 1A of the first embodiment as described above,
1. The hot air staying on the back surface of the sheet-like heat collecting material 3 can be actively taken in, and the heat collecting efficiency can be improved.
2. The pressure loss due to the sheet-like heat collecting material 3 can be reduced, and the running cost for generating the airflow can be reduced.
3. The heat collection efficiency can be increased, and the entire apparatus can be made compact.

  Below, 2nd Embodiment of the pneumatic solar heat collecting device 1B which concerns on this invention is described. Note that, in the configuration of the second embodiment, the same or equivalent configuration as the configuration of the first embodiment described above is denoted by the same reference numeral, and the description thereof is omitted.

  FIG. 4 is a perspective view showing the pneumatic solar heat collecting apparatus 1B of the second embodiment, and FIG. 5 is a cross-sectional view seen from the side. As shown in FIGS. 4 and 5, the second embodiment is characterized in that one sheet-like heat collecting material 3 is stretched on a plurality of heat collecting material support bars 4.

  The heat collecting material support rod 4 is for supporting the sheet-shaped heat collecting material 3 and is formed in a small-diameter rod shape. Each heat collecting material support rod 4 has a length substantially the same as the lateral width of the heat collecting case 2, and both ends thereof are fixed to the inner wall surface of the heat collecting case 2. Further, as shown in FIG. 5, the heat collecting material support bars 4 are alternately arranged in the vertical direction along a direction substantially orthogonal to the air flow in the heat collecting case 2.

  Further, in the second embodiment, as shown in FIG. 5, the lower heat collecting material support bars 4 are at a height position where the lower gap 31 is formed, and at equal intervals in the air flow direction. It is fixed. Further, each of the upper heat collecting material support rods 4 is at a height position where the upper gap 32 is formed, and has a substantially diameter with respect to each of the lower heat collecting material support rods 4 in the air flow direction. It is fixed downstream by the amount. Of course, the arrangement position of these heat collecting material support rods 4 can be changed as appropriate.

  On the other hand, the sheet-like heat collecting material 3 is composed of a single bent carbon fiber sheet that is substantially the same width as the heat collecting case 2 and is longer than the vertical width of the heat collecting case 2. 4 and 5, the sheet-like heat collecting material 3 is stretched so as to be wound around the upper and lower heat collecting material support rods 4 in order to form a substantially wave shape.

  Therefore, the pneumatic solar heat collecting apparatus 1B of the second embodiment simply winds one sheet of heat collecting material 3 around each heat collecting material support rod 4 fixed in the heat collecting case 2 in order, The lower gap 31 and the upper gap 32 are easily formed, the assembly work is facilitated, and the price of the product is reduced.

  According to the second embodiment as described above, in addition to the effects of the first embodiment described above, the pneumatic solar heat collecting apparatus 1B can be easily and quickly assembled, and the product price can be reduced. There is an effect.

  Next, specific examples of the pneumatic solar heat collecting apparatus according to the present invention will be described. In this example, the pneumatic solar heat collecting apparatus 1A according to the first embodiment was prototyped and an experiment was performed to measure its performance.

First, the pneumatic solar heat collecting apparatus 1A used in the present embodiment will be described. The heat collection case 2 is made of an aluminum alloy and has a size of 980 mm × 1,500 mm (effective heat collection area of 1.397 m ² ) and a thickness of 70 mm. Further, as the sheet-like heat collecting material 3, four curved carbon fiber sheets (manufactured by Osaka Gas Chemical Co., Ltd.) having the characteristics shown in FIG. 6 were used. The bottom surface of the heat collection case 2 was laid with a urethane foam heat insulating material having a thickness of 15 mm, and the upper surface of the heat collection case 2 was coated with a semi-tempered glass with a thickness of 4 mm as a transmission body 21.

  On the inner wall surface of the heat collecting case 2, aluminum alloy L-shaped angles were installed at predetermined intervals, and the upper end portions of the respective sheet-like heat collecting materials 3 were fastened and fixed thereto with screws and washers. Further, the lower end portion of each sheet-like heat collecting material 3 was sandwiched between 15 mm-wide aluminum punching metal and screwed, and tapped at two locations on the inner wall surface of the heat collecting case 2 to be suspended. Thereby, each sheet-like heat collecting material 3 was made to cross | intersect an air flow, and the 15 mm width lower space | gap 31 was formed. The light-receiving surface of the aluminum punching metal was painted with matte black.

  On the other hand, in the present example, as a comparative example, a similar experiment was performed on a conventional pneumatic solar heat collecting apparatus without the lower gap 31 and the upper gap 32. A heat collecting apparatus used as a comparative example is shown in FIG. The dimensions of the heat collection case are 1,000mm x 2,000mm and the thickness is 190mm. As the sheet-like heat collecting material, five straight carbon fiber sheets were used. A straight carbon fiber sheet and a heat insulating material were laid on the bottom surface of the heat collection case, and a cover glass was coated on the top surface of the heat collection case.

  In the comparative example, as shown in FIG. 7, the inside of the heat collecting case is divided into three channels to form a passage for the heat transfer air. A lower header is provided as the intake port 23 and an upper header is provided as the exhaust port 24 so that an air flow flowing from the lower header to the upper header through each channel is formed.

  Next, an experimental apparatus and an experimental method in this example will be described. FIG. 8 is an overall view showing the experimental apparatus used in this example. In this example, a laboratory experiment using a large solar simulator was performed in accordance with a test method in Japan Quality Assurance Organization (JQA). The solar simulator (W1,200mm × L2,200m) has 20 xenon lamps (8kW) in its light source, and these can be adjusted to emit artificial light. Then, a solar simulator was installed at an inclination angle of 42 ° (air mass AM1.5), and the pneumatic solar heat collecting apparatus 1A of this example was installed so as to face in parallel with this. Moreover, the pyranometer was arrange | positioned at nine points on the transmission body 21, and the average value of the intensity | strength measured with each pyranometer was made into irradiation intensity.

  In the laboratory, the outside air was introduced from the outside air inlet provided in the kinematic pair through a duct provided on the second floor adjacent to the room, and the room temperature was kept constant by cooling. Then, a sirocco fan was installed on the most downstream side of the duct connected to the exhaust port 24, and heat medium air was taken in from the intake port 23. The amount of air flow through the sirocco fan was adjusted with a stabilized power supply and a bolt slider, and measured by combining a rectifying element and a Pitot tube. In addition, a heater or a cool air fan was installed in the duct connected to the intake port 23, and the intake air temperature was adjusted by adjusting the heating amount with a bolt slider.

  In the inlet 23 and the outlet 24 (hereinafter referred to as the inlet / outlet) of the heat collecting case 2, 12 calibrated T-type thermocouples (φ0.32mm) are provided in 12 locations (3 in the radial direction and 4 in the circumferential direction). Point) Installed and measured the air temperature at the entrance and exit. In addition to the above 12 points, 3 points (upstream / middle / downstream) on the surface of the transmission body 21, 3 points between the transmission body 21 and the sheet-shaped heat collecting material 3, 3 points on the sheet-shaped heat collecting material 3, A total of 18 similar thermocouples were installed: 3 points between the bottom surface of the sheet-like heat collecting material 3 and the heat collecting case 2, 3 points on the bottom surface of the heat collecting case 2, 3 points on the back surface of the heat collecting case 2.

  For each duct, an aluminum film-covered wire flexible duct (φ150 mm) with glass wool insulation was used. On the other hand, a vinyl chloride pipe (φ150 mm) was used for the temperature measurement part at the entrance and exit, and a steel pipe (φ100 mm) was used for the flow rate measurement part, and each was kept warm with a urethane foam insulation cylinder having a thickness of 50 mm.

  When air is used as the heat medium as in this embodiment, the temperature in the vicinity of the entrance / exit is particularly uneven in the radial direction. For this reason, in the present Example, the guard heater covered with the heat insulating material with the aluminum vapor deposition film was installed in the temperature measurement part of the entrance / exit, and temperature unevenness was suppressed to the minimum.

  Moreover, the pressure loss of the panel was measured by providing each of the static pressure outlets (φ1.5 mm) installed in the upper and lower plenums. In addition, ambient air temperature and relative humidity are measured using an Asman ventilation thermo-hygrometer installed at a position 1.4m above the ground surface behind the pneumatic solar heat collector 1B. Was also measured.

Under the above experimental conditions, the heat collection efficiency η _t was measured when the air flow rate V was 100 m ³ / hr and the ambient wind speed W was 0 m / s. In addition, the heat collection efficiency η _J of the heat collecting apparatus of the comparative example was measured under the same conditions. The result is shown in FIG. The correlation formula according to this example is shown in the following formula (1).
η _t = −0.96Δt / I + 89.9, r ² = 0.924 (1)
However, Δt is the difference between the average value of the entrance and exit temperatures and the outside air temperature, I is the irradiation intensity, and r is the correlation coefficient.

As shown in FIG. 9, in this embodiment, the negative slope of the heat collection efficiency eta _t for heat collection efficiency variable Delta] t / I is, although slightly larger than that of the comparative example, in the range of this experiment, the value of the heat collection efficiency eta _t Compared with the comparative example, it was shown that the heat collection efficiency was improved. It is desirable to improve the heat collection efficiency in a range where the heat collection temperature is high, that is, Δt / I is large. However, if the heat collection temperature is high, good heat retention is advantageous for improving the heat collection efficiency. Compared with the comparative example, this example has a structure in which the thickness of the casing and the thickness of the heat insulating material are about 1/3, which is inferior in heat retention, and the thickness of the carbon fiber sheet is also ½. However, considering that the above results were obtained, it is clear that the present example collects heat very efficiently compared to the comparative example, and it can be said that the practicality is high.

  According to the present embodiment as described above, it has been shown that the heat collection efficiency is improved as compared with the conventional heat collection apparatus without the lower gap 31 and the upper gap 32. Compared with FIG. 3 of the above-mentioned Patent Document 1 in which only the upper gap 32 is provided, the heat collecting case 2 of this embodiment has a thickness of about 1/3 and a heat medium airflow direction length of about 1 /. In spite of being 4, it can be seen that the heat collection efficiency is improved.

  In addition, the pneumatic solar heat collecting apparatuses 1A and 1B according to the present invention are not limited to the above-described embodiments, and can be appropriately changed.

  For example, the number of sheets and the inclination angle of the sheet-like heat collecting material 3 are not particularly limited, and may be appropriately increased or decreased according to the usage application.

  Moreover, as a method of attaching the heat collecting material support rod 4, for example, as shown in FIG. 10, an attachment cap 41 that is inserted and bonded to both ends of the heat collecting material support rod 4 may be used. The mounting cap 41 is made of a thin metal plate such as an aluminum alloy or a heat-resistant plastic material. Further, the mounting cap 41 is formed with a locking portion 42 whose diameter is increased in a tapered shape toward the base end side. The locking portion 42 can lock a spring 43 made of a coil spring or the like.

  On the other hand, the heat collecting case 2 is made of a thin plate made of aluminum alloy in consideration of weight reduction and rust prevention function. A pair of insertion holes 25 facing each other are formed on the inner wall surface of the heat collecting case 2 at a height position where the heat collecting material support rod 4 is attached. The insertion hole 25 has a hole diameter into which the mounting cap 41 can be fitted.

  In the above configuration, when the heat collecting material support rod 4 is attached to the heat collecting case 2, first, the attachment cap 41 so as to sandwich the spring 43 between the locking portion 42 and the inner wall surface of the heat collecting case 2. Is inserted into the insertion hole 25. Then, with the spring 43 compressed, the other end of the heat collecting material support rod 4 is inserted into the other insertion hole 25. As a result, the spring 43 urges the mounting cap 41 on the other side toward the inner wall surface side of the heat collecting case 2 and locks the locking portion 42, so that the heat collecting material support rod 4 can be easily and securely attached. It is done.

1 is a perspective view showing a first embodiment of a pneumatic solar heat collecting apparatus according to the present invention. It is sectional drawing which shows the pneumatic solar heat collecting device of this 1st Embodiment. It is a SEM (Scanning Electron Microscope: scanning electron microscope) image of the sheet-like heat collecting material in the first embodiment. It is a perspective view which shows 2nd Embodiment of the pneumatic solar heat collecting device which concerns on this invention. It is sectional drawing which shows the pneumatic solar heat collecting device of this 2nd Embodiment. It is a table | surface which shows the characteristic of the curved carbon fiber sheet used by the present Example. In a present Example, it is a perspective view which shows the heat collecting apparatus used as a comparative example. It is a general view which shows the experimental apparatus in a present Example. It is a graph which shows the experimental result of a present Example. It is a figure which shows an example of the attachment method of a heat collecting material support bar.

Explanation of symbols

1A Pneumatic solar collector (first embodiment)
1B Pneumatic solar collector (second embodiment)
DESCRIPTION OF SYMBOLS 2 Heat collection case 3 Sheet-shaped heat collection material 4 Heat collection material support rod 21 Transmission body 22 Heat insulating material 23 Intake port 24 Exhaust port 25 Insertion hole 31 Lower space | gap 32 Upper space | gap 41 Mounting cap 42 Lock part 43 Spring

Claims (3)

A hollow heat collecting case whose upper surface is covered with a transparent body having excellent sunlight transmittance,
A sheet-like heat collecting material provided with an inclination so as to block the heat medium air flowing in the heat collecting case, and having a minute gap through which the heat medium air can pass,
In the lower part of the sheet-like heat collector, a lower gap having a ventilation width that allows the heating medium air to rise along the back surface of the sheet-like heat collector ,
On the inner wall surface of the heat collecting case, a plurality of heat collecting material support bars for supporting the sheet-shaped heat collecting material are alternately arranged in the vertical direction. A pneumatic solar collector in which the sheet-like heat collector is stretched so as to form a substantially wave shape . In claim 1,
The pneumatic solar collector, wherein the sheet-shaped heat collecting material is a curved carbon fiber sheet formed by bending bent carbon fibers into a sheet shape. The sheet-shaped heat collecting material according to claim 1 or 2 , wherein the sheet-like heat collecting material is stretched so as to provide an upper gap that suppresses heat loss from the transmission body. Pneumatic solar heat collector.