JPS581737Y2 - solar collector - Google Patents

Description

[Detailed description of the invention] The present invention relates to a solar heat collector that heats a heat medium flowing inside through indirect heat exchange with solar heat. Another point is to make it possible to significantly reduce costs by significantly simplifying the manufacturing process.

First, the embodiment of the present invention will be explained based on the drawings.
Basically, as shown in Figs. 1 to 3, two faces are formed by flat plate parts 1 and 1, which are arranged oppositely at an appropriate interval, and
Both ends in the width direction are closed by integrally connecting the closing plate parts 2, 2 thereto, and the heat medium (
The flat plate parts 1, 1 are arranged so that the distance between them becomes gradually smaller toward the downstream side in the flow direction of the heat medium, so that the flow path 3 for the heat medium in the solar heat receiving section is formed. The thickness of the layer is changed, and both the flat plate parts 1,
Grooves 4, 4 for dividing flow and header are integrally formed on at least one of the upper side and the lower side of 1 (both are shown in the figure, but only the upper side or the lower side may be used). In order to improve thermal efficiency, it is desirable to make the spacing between the two flat plate parts 1, 1 relatively small. The width of the flat plate parts 1, 1, that is, the blocking plate part 2
.

The header grooves 4, 4 are configured so that an inflow pipe 5 and an outflow pipe 6 of the heat medium can be connected to appropriate positions thereof, respectively.

As the material for the flat plate parts 1, 1, it is preferable to use a thin metal plate with high thermal conductivity, such as copper or stainless steel, and to integrally form the groove parts 4, 4 by pressing this. It may be made of metal or synthetic resin.

In any case, at least the outer surface of the flat plate part 1 on the front side, preferably both flat plate parts 1, 1, including the groove parts 4, 4, can be blackened to increase heat collection efficiency and suppress heat dissipation. preferable.

Both flat plate parts 1, 1 and both closing plate parts 2, 2 are made into one piece from the beginning by bending a single plate or by injection molding of resin, or by welding or brazing the front and back parts. They may be connected by any suitable means such as bonding, gluing, fusing, or securing as shown in Figure 4.

Since the heat medium flowing through the flow path 3 directly contacts the entire inner surface of the flat plate 1 heated by solar heat, the flat plate part 1
absorbs heat with a large heat transfer coefficient.

And since the flat plate part 1 is cooled by this heat absorption,
It receives a large amount of solar heat and immediately transfers this heat to the heat medium with an extremely low dissipation rate.

That is, the heat medium flowing in the upstream portion of the flow path 3 flows through the inflow pipe 5.
Since it is relatively low temperature and has a large difference in temperature from the solar heat collected by the flat plate part 1, the spacing between the flat plate parts 1 and 1 in the upstream part is relatively large. Despite this, it is possible to rapidly transmit the collected solar heat to the center of the flowing heat medium layer.

On the other hand, in the downstream portion, the heat medium has already been heated up to this point and the difference from the heat collection temperature becomes small, so there is generally a tendency for the efficiency of heat transfer to the heat medium to decrease.

Therefore, in the illustrated structure, the flat plate portions 1, 1 become smaller toward the downstream side.
The thickness of the fluid heat transfer medium layer is gradually reduced by decreasing the facing distance between the two, and conversely, the area for receiving solar heat is gradually increased, so the temperature difference becomes smaller. Despite this, the overall heat collection effect is more than adequate.

In summary, the solar heat collector according to the present invention has two flat plate parts 1, 1 arranged oppositely at an appropriate interval, and both ends of the flat plate parts 1, 1 are closed. A heating medium flow path 3 is formed, and the flat plate parts 1, 1 are arranged so that the spacing between them becomes gradually smaller toward the downstream side in the heating medium flow direction, so as to reduce the thickness of the heating medium layer in the solar heat receiving part. and further the both shoulder flat plate portions 1,
It is characterized by having a structure in which grooves 4, 4 for dividing and collecting headers are integrally formed on at least one of the upper side and the lower side of the flat plate part 1. In other words, the entire surface of the flat plate part 1 becomes an effective heat transfer surface in the sense that it immediately transfers a large amount of received solar heat to the heat medium and receives a large amount of solar heat due to the resulting cooling. Furthermore, since there is a large temperature difference between the low-temperature heat medium and the collected solar heat on the upstream side, the spacing between the flat plates 1 and 1 is increased to take advantage of the rapid transfer of heat energy. On the other hand, in the downstream type, the difference between the already heated heat medium and the solar heat temperature is small, so the spacing between the flat plates 1 and 1 is made small to collect the heat efficiently. By changing the thickness of the heat transfer medium layer in the solar heat receiving part, heat transfer based on the temperature rise during the flow process is carried out more efficiently, such as aiming for efficient heat collection even when the transfer of energy is slow. Since efficient heat collection is aimed at, it is possible to exhibit a large heat collection effect that can be used for practical purposes, and its structure is such that the opposite flat plate parts 1, 1 are closed at both ends, and the header As mentioned above, this is a very simple structure in which the grooves 4, 4 are formed integrally, and therefore, it can be manufactured by extremely simple means such as sheet metal bending or press working. While still achieving sufficient heat collection effects, we were able to achieve significant overall cost reductions.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the solar collector according to the present invention, with FIG. 1 being a schematic plan view and FIG. 2 showing II in FIG. 1.
3 is a sectional view taken along the line III in FIG. 1, and FIG. 4 is a partially enlarged sectional view. 1... Flat plate part, 3... Heat medium flow path,
4... Groove for header.

Claims (1)

[Scope of Claim for Utility Model Registration] ■ A fluid-type solar heat collector that heats a heat medium flowing inside the collector through indirect heat exchange with solar heat,
Two flat plate parts 1, 1 are formed to face each other at an appropriate interval, and both ends of the flat plate parts 1, 1 in the width direction are closed to form a heat medium flow path 3 between the shoulder flat plate parts 1, 1, and The flat plate parts 1, 1 are arranged so that the distance between them gradually decreases toward the downstream side in the direction of flow of the heat medium, thereby changing the thickness of the heat medium layer in the solar heat receiving part. A solar collector characterized in that it has a structure in which grooves 4, 4 for dividing and collecting headers are integrally formed on at least one of the upper and lower sides of the part 1.1. (2) The solar collector according to claim (2), wherein the flat plate portions 1, 1 are formed such that the width thereof gradually increases toward the downstream side in the flow direction.