JPH10306946A - Solar heat utilizing heating medium heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar heat utilizing heating medium heater for efficiently utilizing solar light energy. SOLUTION: A lens 15 has a convex lens (semicylindrical lens) having thin right and left ends and a thick central part of a linear focus type. The lens 15 is disposed at a position for concentrating solar rays to a center of a heating medium tube straight part 27. When the lens 15 is driven by a lens driver, it is rotated at a tubular center of the part 27 as a rotating center. A controller calculates a direction of the sum at present time based on contained astronomical movement information, and then outputs a drive command to a turntable driver and the lens driver. Thus, directions of the part 27 and the lens 15 coincide with incident direction of the solar rays, and the solar rays are incident perpendicularly to the upper surface of the lens 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar heat utilizing heating medium heating apparatus for heating a heating medium by solar heat, and relates to a technique for improving utilization efficiency of solar thermal energy.

[0002]

2. Description of the Related Art Conventionally, solar water heaters and solar power generation devices have been put into practical use as devices that utilize sunlight as energy. The former raises the temperature of cold water by radiant heat from the sun, and is mainly used for hot water supply in ordinary households. In addition, the latter converts solar light into electricity using a solar cell, and in addition to a very small one installed on the roof of a house, there is also a relatively large one installed on the roof of a factory or a building. .

[0003]

However, it has been difficult for the above-described solar water heaters and solar power generators to be used industrially due to the extremely low utilization efficiency of solar energy. That is, in the solar water heater, the temperature of the obtained hot water is 9 because the water is heated by radiant heat.
It was only about 0 ° C and was used as a heat source for regenerators in absorption chillers, but it was not widely used due to the small difference in temperature used. Further, in a solar power generation device, since power generation per unit area is extremely small, there remains a problem such as high equipment cost as a power source for a power source or the like.

[0004] An object of the present invention has been made in view of the above situation, and an object of the present invention is to provide a solar heat utilizing heating medium heating device capable of utilizing solar energy with high efficiency.

[0005]

According to a first aspect of the present invention, there is provided a lens for concentrating sunlight, and a heating medium tube having a tube core disposed at a focal point of the lens. We propose a solar heat utilizing heating medium heating device comprising:

According to the present invention, the heat medium in the heat medium tube is heated to a high temperature by the heat energy of sunlight concentrated by the lens. For example, this heat medium is used as a heat source of a regenerator of an absorption refrigerator. Becomes possible.

According to the invention of claim 2, according to claim 1,
It is proposed that the above-mentioned solar heat utilizing heating medium heating device is a lens in which the lens is a semi-cylindrical lens which is focused along the heating medium tube.

According to the present invention, since the entire amount of heat energy of sunlight passing through the lens is uniformly supplied to the heat medium tube, the heating temperature of the heat medium is increased, and the heat medium tube is cooled by the heat medium. Therefore, those having relatively low heat resistance can be used.

Further, according to the invention of claim 3, according to claim 1
Alternatively, it is proposed that the heating medium tube is disposed in a transparent tube forming a vacuum in the solar heat utilizing heating medium heating device.

According to the present invention, heat radiation from the heat medium tube surface due to heat conduction is reduced, and a decrease in the temperature of the heat medium can be suppressed.

Further, according to the invention of claim 4, according to claim 3,
In the heating medium heating apparatus utilizing solar heat of (1), the transparent tube is proposed in which a portion excluding a sunlight incident portion is covered with a radiation reflecting material.

According to the present invention, heat radiation from the heat medium tube surface due to heat radiation is reduced, and a decrease in the temperature of the heat medium can be suppressed.

According to the invention of claim 5, according to claim 3,
Alternatively, in the solar heat utilizing heating medium heating device of 4, the present invention proposes a transparent tube in which a portion excluding a sunlight incident portion is covered with a heat insulating material.

According to the present invention, the temperature of the transparent tube is hardly lowered even in a cold or strong wind, and the temperature of the heat medium is prevented from dropping and frost formation.

According to the invention of claim 6, according to claim 1,
In any one of (1) to (5), the first lens supports the lens rotatably around the core of the heat medium tube.
And a lens driving unit that rotationally drives the lens so as to face the incident direction of sunlight.

According to the present invention, since the entire amount of sunlight transmitted through the lens is always concentrated on the heat medium tube, the heat energy of the sunlight can be used without waste.

Further, according to the invention of claim 7, according to claim 1,
The present invention proposes the solar heat utilizing heating medium heating apparatus of (1) to (6), further comprising a second supporting means for rotatably supporting the lens and the heating medium tube around a substantially vertical axis.

According to the present invention, for example, the lens and the heating medium tube are slightly rotated about once a day in accordance with the seasonal change of the incident angle of the sunlight, so that the heat energy of the sunlight Can be used

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view showing a schematic configuration of a steam production system employing a solar heat utilizing heating medium heating device (hereinafter simply referred to as a heating medium heating device) according to the present invention, and FIG. 2 is a plan view of the same.

The steam production system includes a heating medium heating device 1 and a heat exchanger 3, a pair of flexible tubes (hereinafter, referred to as flexible hoses) 5 and 6 for connecting the heating medium and the heat exchanger. 3, a hot water pipe 7 for feeding hot water from a hot water tank (not shown), a steam pipe 9 for feeding steam to a regenerator of an absorption refrigerator (not shown), and the like.

The heating medium heating device 1 includes a turntable 11 serving as a main body of the device, a heating medium tube 13 mounted on the upper surface of the turntable 11, and a plurality of heating medium tubes 13 disposed above the heating medium tube 13. In the present embodiment, ten lenses 15 are used as main components. The turntable 11 is, via a lower tire 21, an annular rail 2 installed on the ground surface GL.
3 and is rotatably driven by a turntable driving device 25. The heating medium tube 13 has 10
Each of the heat transfer tube straight portions is formed in a meandering shape including a straight portion (hereinafter, referred to as a heat transfer tube straight portion) 27 and nine bent portions (hereinafter, referred to as a heat transfer tube bent portion) 29. The portion 27 is located immediately below each lens 15. The lens 15 is rotatably supported at both ends by a lens support lever 31, and is driven to rotate by a lens driving device 33 connected to one end.

FIG. 3 is an explanatory view of the heat medium pipe straight section 27 as viewed from the axial direction. The lens 15 is a linear focus type convex lens (cylinder lens) in which the left and right ends in the figure are thin and the center is thick. The lens 15 is disposed at a position where sunlight (indicated by an arrow) is concentrated on the core of the heat medium pipe straight section 27, and when driven by the lens driving device 33, is indicated by a two-dot chain line in FIG. As shown in the drawing, the heat medium pipe linear portion 27 rotates around the core. In the present embodiment, the lens 15 is made of glass or a high-strength transparent synthetic resin.

FIG. 4 is a longitudinal sectional view of the heat medium pipe straight section 27 of the heat medium pipe 13. The heat medium tube 13 is housed in the transparent glass tube 43 while the heat medium 41 circulates therein, and the space 44 between the heat medium tube 13 and the transparent glass tube 43 is evacuated. . Also, the transparent glass tube 43
A heat insulating tube 45 is further disposed on the outer peripheral side of the light emitting device.
From the light source.

A guide roller 49 made of ceramic is rotatably attached to the lower portion of the heat medium tube 13 at a predetermined interval, and the guide roller 49 causes the heat medium tube 13 to pivot with respect to the transparent glass tube 43. Guidance for sliding in the direction is provided. The heat insulating tube 45 is formed of a heat insulating material such as glass fiber, and has a reflective material 51 such as an aluminum foil or a gold foil (when the temperature of the heat medium is high) that reflects light on its inner peripheral surface.
Is attached, and a cover 53 made of transparent glass for preventing intrusion of dust and the like is attached to the slit 47.
The heat insulating tube 45 rotates together with the lens 15 so that the sunlight always passes through the slit 47.

FIG. 5 is a sectional view taken along the line AA in FIG. 4, and shows the vicinity of a connection portion between the heat medium pipe 13 and the flexible hose 6. As shown in this figure, a terminal cap 61 made of transparent glass is adhered to an end of the transparent glass tube 43, and this terminal cap 61 is attached to an end flange 63 of the heat medium tube 13 via a heat-resistant packing 65. Thus, the vacuum of the space 44 is maintained.

FIG. 6 is a cross section showing the vicinity of the bent portion 29 of the heat medium pipe. As shown in this figure, the heating medium tube bending portion 29
An arc-shaped bent portion 71 is formed at the center thereof, and the whole is housed in a vacuum box 73 made of a steel plate. The vacuum box 73 is provided with a space in which the bent portion 29 can move to the left in the drawing to absorb the thermal expansion of the heat medium pipe linear portion 27. In FIG. 6, reference numeral 75 denotes a heat insulating material for covering the vacuum box 73, and reference numeral 77 denotes a pillar for reinforcement.

The operation of this embodiment will be described below.

When the steam production system is started, the heat medium 44 flows in the heat medium pipe 13 in the direction shown by the arrow in FIG. 1 by the pump (not shown), and the operation of the heat medium heating device 1 starts. Is done. Then, the control device (not shown) in the heat medium heating device 1 calculates the current direction of the sun based on the built-in celestial body operation information, and then outputs a drive command to the turntable drive device 25 and the lens drive device 33. . As a result, the direction between the heat medium pipe linear portion 27 and the lens 15 coincides with the incident direction of sunlight, while sunlight enters the upper surface of the lens 15 at a right angle.

As shown in FIG. 3, the sunlight passing through the lens 15 concentrates on the core of the heat medium pipe straight section 27 and heats the heat medium 41 in the heat medium pipe 13. Heat medium 41 of the present embodiment
If the weather conditions are good, the temperature may increase to several hundred degrees while passing through the heat medium pipe 13. At this time, even if radiant heat is radiated from the surface of the heat medium pipe straight section 27, the radiant heat is reflected by the reflector 51 attached to the inner peripheral surface of the heat insulating pipe 45, and most of the heat is heated by the heat medium pipe straight section 27. Will be offered. Further, since the entire heat medium tube 13 is in a vacuum, the temperature of the heat medium 41 due to heat conduction is prevented from lowering, and the surface is prevented from being oxidized.

On the other hand, the heat medium pipe linear portion 27 undergoes thermal expansion due to the passage of the high-temperature heat medium 41 therein, but is supported by the guide roller 49 so as to be relatively movable with respect to the transparent glass tube 43. Therefore, as shown by the two-dot chain line in FIG. 6, the thermal expansion is absorbed by the movement of the heat medium pipe bent portion 29. Further, the thermal expansion on the heat medium tube bending portion 29 side is also absorbed by the arcuate bending portion 71 being elastically deformed.

The high-temperature heat medium 41 flows into the upper part of the heat exchanger 3 through the flexible hose 6 and exchanges heat with the hot water supplied from the hot water pipe 7 to remove the hot water. High temperature (for example, about 180 ° C.) steam is used. Steam is
It is sent to the regenerator of the absorption refrigerator through the steam pipe 9 and is used for regeneration of the liquid absorbent.

The description of the specific embodiment has been completed.
Aspects of the present invention are not limited to this embodiment. For example, in the above-described embodiment, the present invention is applied to a steam production system that supplies high-temperature steam. The present invention may be applied to various devices that perform heating up to. Alternatively, the direction of the sun may be detected by a sunshine sensor or the like, and drive control of a lens or the like may be performed based on the detection result. In addition, the specific configuration of the device, the material of each component, and the like can be appropriately changed without departing from the spirit of the present invention.

[0033]

As is clear from the above description, according to the solar heat utilizing heating medium heating apparatus of the present invention, since the sunlight can be used without waste, it is possible to produce a high-temperature heating medium without pollution. It produces various effects.

[Brief description of the drawings]

FIG. 1 is a side view showing a schematic configuration of a steam production system employing a solar heat utilizing heating medium heating apparatus according to the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is an explanatory view of a straight line portion of a heat medium tube viewed from an axial direction.

FIG. 4 is a longitudinal sectional view of a heat medium pipe straight section of the heat medium pipe.

FIG. 5 is a sectional view taken along line AA in FIG.

FIG. 6 is a cross-sectional view showing the vicinity of a bent portion of the heat medium tube of the heat medium tube.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 solar heat utilizing heating medium heating device 3 heat exchanger 5, 6 flexible tube for transporting heating medium 7 hot water tube 9 steam tube 11 turntable 13 heating medium tube 15 lens 25 turntable driving device 27 heating medium tube straight section 29 heating medium Tube bending part 33 Lens driving device 41 Heat medium 43 Transparent glass tube 45 Heat insulating tube

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takao Tanaka 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd.

Claims (7)

[Claims] 1. A solar heating medium heating apparatus comprising: a lens for concentrating sunlight; and a heating medium tube having a tube core disposed at a focal point of the lens. 2. The heating device for heating a solar medium using solar heat according to claim 1, wherein the lens is a semi-cylindrical lens focusing on the heat medium tube. 3. The heating medium heating apparatus using solar heat according to claim 1, wherein the heating medium tube is disposed in a transparent tube forming a vacuum. 4. The transparent tube, wherein a portion excluding a sunlight incident portion is covered with a radiation reflecting material.
The heating medium heating device using solar heat according to claim 3. 5. The heating apparatus for heating a solar medium using solar heat according to claim 3, wherein the transparent tube is covered with a heat insulating material except a portion where a sunlight enters. 6. A first supporting means for rotatably supporting the lens about a core of the heat medium pipe, and a lens driving means for rotating and driving the lens so as to face the incident direction of sunlight. The solar-heat-based heating medium heating device according to any one of claims 1 to 5, comprising: 7. The apparatus according to claim 1, further comprising a second supporting means for rotatably supporting the lens and the heat medium tube around a substantially vertical axis. A heating medium using solar heat as described in the above.