JPH0579708A - Solar heat collector - Google Patents

Abstract

PURPOSE:To raise the heat accumulating effect and improve the heat collecting effect by constituting a substrate that constitutes a heat collecting member of a solar heat selectively absorbing fibers. CONSTITUTION:In the upper section on the side of the projection of a heat collecting member 5 on the substrate 3 of which many needles are planted to project from the surface a light transmitting plate 2 is provided and an air space is formed between the surface of the substrate 3 and the light transmitting plate and a heat collecting medium 8 goes through this air space. And this heat collecting plate 5 is constituted of a sheet-shaped material consisting of a solar heat absorbing fiber that is obtained by spinning the molten mixture of powder of a transition metal that belongs to group IV of Periodic Table and polyamide resin or polyester resin as a thread or a composite thread. Further, the whole heat collecting section 5 is colored black by painting it with a paint that contains powder of ZrC, TiC, HfC, etc. The light 1 goes through a light transmitting plate 2 and hits a heat collecting member 5 that is formed by planting needles into the substrate 3 and the sun light is converted into heat at the heat collecting member 5. A heat collecting medium 8 flows in from a duct 7 and flows between the heat collecting member 5 and light transmitting plate 2, and it receives heat there and flows out from a duct 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar heat collector used when utilizing solar heat as an energy saving source.

[0002]

2. Description of the Related Art Conventionally, as a collector using a needle-shaped member as a solar heat collecting member, as shown in JP-A-62-238944, woven or non-woven fabric of natural fibers or synthetic fibers,
There is a substrate formed by stacking sheet-like materials such as felt by implanting metal needles or carbon filaments with a high heat absorption rate, and the substrate itself for fixing the needle efficiently applies solar heat. The means to use is not adopted.

That is, the substrate is a fiber,
As it is composed of rubber, resin, etc., it absorbs heat from the substrate itself,
The heat storage effect was poor and the heat reflection was large, which hindered the increase in heat collection efficiency.

[0004]

The problem to be solved by the invention is to enhance the heat storage effect by constructing the heat collecting member of the solar heat collector as a whole with a material having a high heat absorption rate. It is intended to provide a heat collector having improved heat dissipation.

[0005]

Means for Solving the Problems In solving the problems of the present invention, a heat collecting member in a solar heat collector is provided with a carbide powder of a transition metal belonging to Group IV of the periodic law and a polyamide or polyester resin. Sheet-like woven fabric, knitted fabric or nonwoven fabric formed by knitting or weaving with a spun yarn or filament yarn of solar heat selective absorbent fiber obtained by melt spinning or melt composite spinning of a kneaded composition with Each one individually,
Alternatively, a substrate formed by integrally laminating a plurality of these sheets and a needle-shaped member having excellent heat conduction are implanted in the substrate and formed so as to project from the substrate surface to absorb more solar heat and once absorb it. The heat dissipation is minimized to eliminate the above problems.

[0006]

As shown in FIGS. 1, 2 and 3, when the solar collector of the present invention is exposed to the sun, the sunlight 1 passes through the transparent light transmitting plate 2 and the substrate 3 has needles 4. Heat collecting member 5 having a protrusion
The sunlight 1 is converted into heat by this heat collecting member. Further, a low temperature heat collecting medium 8 is introduced from a heat collecting medium inlet duct 7 attached to a casing 6 accommodating the heat collecting member.
Flows in, flows in the space between the heat collecting member 5 and the light transmitting plate 2, receives heat converted by sunlight from the surfaces of the substrate 3 and the needle 9, and collects heat attached to the casing 6. The medium exit duct 10 flows out of the casing.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. 1m in height and 2 in width as shown in FIG. 1 and FIG.
A glass fiber non-woven fabric or mat or a styrene foam sheet is laid as the heat insulating material 11 on the bottom of the casing 6 formed to have a size of m, and the heat collecting member 5 is arranged on top of it.

This heat collecting member 5 is a woven fabric 12 made of filament yarn of solar heat selective absorbing fiber in which ZrC is contained in nylon fiber as a transition metal carbide having a U-shaped needle 4 made of stainless steel having a diameter of 0.355. A plurality of sheets are laminated integrally and laminated from the back surface of the substrate 3, and a paint (preferably carbide powder such as ZrC, TiC, HfC or Fe, N
The whole is colored black with a paint obtained by mixing powders of oxides or carbides of i, Mn, Co, Cr, Al and the like.

The height of the needle portion 9 protruding from the surface of the substrate is 20 mm, the number of needles is about 300 per 25.4 mm ² , and the back surface of the flexible needle-like member substrate 3 on which the needles are implanted extends. A holder board 13 made of stainless steel is pasted on the surface to give it a good quality.

On the upper surface of the casing accommodating the heat collecting member 5 , a transparent glass light transmission plate 2 which transmits sunlight is transmitted.
In addition, an inlet duct 7 into which the low temperature heat collecting medium 8 flows in and an outlet duct 10 from which the high temperature heat collecting medium 8 heated by the heat collecting member 5 flows out are provided on both side surfaces of the casing 6. Of the solar collector.

In the above embodiment, as shown in FIG. 3, a partition plate 14 is provided inside the casing 6 so that heat is uniformly taken from the heat collecting member 5 , and the heat collecting medium flowing in the casing 6 is provided. Although the heat collection efficiency of No. 8 is increased, the partition plate 14 can be omitted.

As the material of the needle 4 used in the present invention, carbon steel, alloy steel, high speed steel, copper, aluminum, aluminum alloy, resin pile containing metal powder or metal fiber, carbon filament, ceramics, etc. Can be used.

As a material for forming the substrate 3, carbide powder of a transition metal belonging to Group IV of the periodic law, such as ZrC,
A woven or knitted fabric made of spun yarn or filament yarn using solar heat selective absorbent fiber, which is obtained by melt spinning or melt composite spinning of a composition obtained by kneading TiC, HfC, etc. with a polyamide-based or polyester-based resin. Alternatively, the substrate can be formed by individually or appropriately combining sheet-like materials such as a nonwoven fabric formed of the fibers.

As a result of conducting an experiment by flowing air through the solar heat collector of the present invention having the above structure, the sunshine time in January is 50%.
Even at the day of the day, the air with an outside temperature of 5 ° C has a weight flow rate of 0.0175 Kg.
The maximum temperature reached was 48.9 ° C., and the heat quantity of 965 kcal / m ² could be exchanged at a total solar radiation of 1110 kcal / m ² , and the exchange efficiency could reach 87%.

The pressure loss at the heat collecting medium inlet and outlet at this time was 71.6 mmAq.

[0016]

As described above, according to the present invention, in the solar heat collector, since the substrate of the heat collecting member is made of the sheet material made of the solar heat selective absorbing fiber, even if the daylight hours are short, It does not radiate the absorbed solar heat and has an excellent effect that the heat exchange efficiency can be remarkably improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a solar heat collector according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of FIG.

FIG. 3 is a plan sectional view showing a flow direction of a heat collecting medium in the heat collector.

[Explanation of symbols]

1 Sunlight 2 Light Transmission Plate 3 Substrate 4 Needle 5 Heat Collection Member 6 Casing 7 Heat Collection Medium Inlet Duct 8 Heat Collection Medium 9 Needle 10 Heat Collection Medium Exit Duct 11 Insulation 12 Solar Heat Selective Absorption Fiber 13 Holder Board 14 Partition Board

Claims (2)

[Claims] 1. A space in which a light-transmitting plate is installed above a needle projecting surface of a heat collecting member having a large number of needles protruding from a substrate, and a heat collecting medium is allowed to pass between the substrate surface and the light transmitting plate. In a solar heat collector which forms a part, the substrate is obtained by melt-spinning or melt-composite spinning of a kneading composition of a carbide powder of a transition metal belonging to Group IV of the periodic table and a polyamide-based or polyester-based resin. A solar heat collector comprising a sheet-like material made of a solar heat selective absorbent fiber. 2. The whole heat collecting member is ZrC, TiC, Hf.
A coating material containing a powder of C or the like, which is colored black.
The solar heat collector described.