JPS6325488Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a heat collector for obtaining hot water, steam, etc. using solar heat.

Conventionally, solar heat collectors have been known that use heat pipes as heat collectors. Basically, this type of heat collector collects solar heat by exposing one end of the heat pipe to sunlight. It is configured to collect heat and transport the heat through the heat pipe itself to provide it to a heat medium such as water. By the way, the temperature of heat pipes increases when sunlight irradiates them, but with conventional solar collectors,
Because we use a heat pipe with a straight pipe as an exterior body, when the temperature rises due to exposure to sunlight,
There is a risk that the support part that fixes the heat pipe may be destroyed due to the thermal stress of the heat pipe, and there is a problem that it is difficult to collect heat at high temperatures of 200°C or more, especially for solar thermal power generation. . In addition, solar collectors that use heat pipes as collector tubes are usually installed so that the heat pipes are perpendicular to the sunlight, but the height of the sun (elevation angle relative to the horizontal plane)
is significantly different between summer and winter, so if the installation angle is adjusted to the solar altitude in summer, for example, the sunlight will not be perpendicular to the heat pipe in winter, resulting in a problem of poor heat collection efficiency.

This idea was made in view of the above circumstances, and the purpose is to provide a solar heat collector that is capable of collecting high temperature heat and has good heat collection efficiency regardless of the season. This invention is characterized by using a heat pipe with a corrugated tube as the heat collecting tube. Therefore, in this invention, the heat pipe has flexibility. Even if the heat pipe expands due to the temperature rising due to exposure to sunlight, the heat pipe itself deforms and absorbs the thermal stress, which prevents damage to the support part that fixes the heat pipe. Because the outer surface of the heat pipe is wavy, some part of the outer surface of the heat pipe is always perpendicular to the sunlight regardless of the solar altitude, and in addition, some part of the outer surface of the heat pipe is curved. A part of the sunlight reflected on the slope of the mountain is reflected and absorbed by other mountain parts adjacent to the mountain part, and as a result, the solar heat collection efficiency is improved.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic cross-sectional view showing an embodiment of this invention. The inside of a casing 1 is divided into a water supply chamber 2 and a light receiving chamber 3 by a partition plate 4. A water supply pipe 5 and a drain pipe 6 are connected to continuously circulate a heat medium such as water, and the light receiving chamber 3 is equipped with a transparent plate (not shown) to allow sunlight to reach its interior. covered by. A heat pipe 7 is attached to pass through the partition plate 4, and as shown in the figure, the heat pipe 7 is made of a corrugated pipe (liquid pipe) as an exterior body, and maintains airtightness and watertightness. It is attached to the partition plate 4 in this state. A selective absorption film is formed on the outer circumferential surface of the portion of the heat pipe 7 that protrudes into the light receiving chamber 3 (hereinafter referred to as the light receiving portion), and a selective absorption film that absorbs light of a specific wavelength of sunlight is formed. A glass tube 8 is fitted around the outer periphery of the section, and the inside of the glass tube 8 is evacuated. Therefore, one end of the heat pipe 7 is in contact with the water, and the other end is exposed to sunlight.

However, in the solar heat collector having the above configuration, when sunlight irradiates, the heat is given to the end of the heat pipe 7 protruding into the light receiving chamber 3, and the heat is transferred to the heat of the heat pipe 7 itself. It is transported to the end on the water supply chamber 2 side by the transport function, and then given to the water in the water supply chamber 2. In other words, the heat pipe 7 collects solar heat and converts the heat into sensible heat of water,
Alternatively, it can be collected as latent heat from water evaporation. In that case, the temperature of the heat pipe 7 increases due to sunlight irradiation, but the heat pipe 7
Since the exterior body is made of a corrugated pipe and is flexible, the heat pipe 7 can freely expand thermally and bend as shown by the chain line in FIG. 2, and as a result, the heat pipe 7 is fixed. Since no particularly large load is applied to the parts that are attached, damage to the parts can be prevented. In addition, part of the sunlight irradiated onto the light receiving part that is reflected by the slope of the mountain in the light receiving part reaches other mountain parts as shown in Figure 3, where even a small amount of light is absorbed. Because it will be done,
For example, if the reflectance is 0.1, the actual reflectance is 0.01 (=0.1 x 0.1), and as a result, the heat collection efficiency can be improved compared to when using a heat pipe with a straight pipe as the exterior body. . Furthermore, since the outer surface of the light-receiving part is wavy, even if the altitude of the sun changes and the angle of the sunlight with respect to the central axis of the heat pipe 7 is no longer perpendicular,
Any part of the outer surface of the light receiving part is perpendicular to sunlight, so that heat collection efficiency can always be maintained at a good level regardless of the altitude of the sun. Furthermore, in the solar heat collector having the above-mentioned configuration, the light receiving part of the heat pipe 7 is covered with the glass tube 8 and the inside thereof is kept in a vacuum, so that the light receiving part is kept in an insulated state. Heat radiation due to heat transfer can be prevented, and heat collection efficiency can be improved in this respect as well.

As is clear from the above explanation, this invention uses a heat pipe with a corrugated tube as an exterior body and uses it as a heat collecting tube, so the heat pipe has flexibility, and therefore it Even if the heat pipe expands due to an increase in temperature upon receiving light, the heat pipe itself deforms and absorbs the thermal stress, thereby preventing damage to the support portion that fixes the heat pipe. In addition, since the outer surface of the heat pipe is wavy, some part of the outer surface of the heat pipe is always perpendicular to the sunlight regardless of the solar altitude. A portion of the sunlight reflected on the slope of the mountain is reflected and absorbed by other mountains adjacent to the mountain, improving solar heat collection efficiency like never before. be able to.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing an embodiment of this invention, FIG. 2 is an enlarged sectional view taken along the line - in FIG. 1, and FIG. 3 is a partial view showing a light receiving state. 2...Water supply chamber, 3...Light receiving chamber, 7...Heat pipe.

Claims (1)

[Scope of utility model registration request] In the solar heat collector configured to provide solar heat to the heat medium through the heat pipe by exposing one end of the heat pipe to sunlight and bringing the other end of the heat pipe into contact with the heat medium, A solar heat collector characterized in that at least a portion of the heat pipe that receives sunlight is constituted by a flexible corrugated tube.