JPS6078251A - Heat absorber structure of vacuum tube type solar heat collector - Google Patents

Abstract

PURPOSE:To obtain a heat absorber structure, which has a few solar incident angle dependent characteristic, and at the same time contrive to improve the heat collection efficiency by a structure wherein at least two absorber pipes are disposed in an array above the curve butting part of reflectors and covered by an absorber, the sectional shape of which is an inversed triangle, with a planar part on its top surface and slant parts on both the side surfaces. CONSTITUTION:Two absorber pipes 5 and 5 are arranged bilaterally symmetrically with respect to the butting center line at the upper central position of the butting position of right and left involute curves of reflectors 3, which are arranged in the interior of a vacuumized glass tube 4 at a vacuum tube unit 2. After that, an absorber plate 7 is provided so as to cover the space between the absorber pipes 2 and run slantly on both sides from the outer peripheries of the respective absorber pipes towards a point above the vicinity of the butting position of the right and left involute curves. Finally both the tips of the absorber plate is bonded so as to form a closed loop in order to form an absorber 6, the sectional shape of which is an inversed triangle.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat collector structure of a concentrating vacuum tube type solar heat collector.

Various structures have been proposed for the heat collector of the concentrating vacuum tube type heat collector by combining it with the shape of the solar reflector. In order to achieve this, the light receiving direction of the heat collector should be large (Sn is good, but on the other hand, this also means an increase in the heat dissipation area. Therefore, the radiant heat dissipation type total reduction that increases as the temperature of the heat collector increases) For vacuum tube type heat collectors that are used at high temperatures for the purpose of cooling, many structures have been devised that use the so-called light concentrating method, in which sunlight is concentrated onto the heat collector using a reflector plate.
ing. However, apart from special specifications such as power generation, vacuum tube type heat collectors generally do not have a solar tracking device due to cost issues. A mermaid with a solar collector that doesn't track the sun. There is a solar incident angle for total light that cannot be focused on a heat collector. This causes a decrease in the efficiency of the jJA thermal system due to daily and annual oscillations in the solar incidence angle.

That is, in the conventional concentrating type heat collector using involute reflection p1, the heat collecting part is set as the reference circle 8 of the impolineated curve as shown in Fig. 1, and the radiation heat radiation surrounding is minimized. I decided to take all the precautions I would normally take. - Since it is not possible to secure the aperture width of the reflective surface by just an involute curve, the aperture width is widened by treating the straight part from the involute part as shown in Figure 1, and the cross-sectional shape is changed to a mechanical involute structure. However, this is a major reason why sunlight with a wide angle of incidence cannot be collected on the heat collector.Figure 1 shows the light trail when the sun's angle of incidence is 35 degrees. This means that the sun's rays in the white part were not condensed.The present invention was made in view of the drawbacks of the above 6U2, and is based on the condensing type Embodiments of the present invention are shown in FIGS. 2 to 1, which aim to provide a heat collector structure in which the light collection efficiency is less dependent on sunlight incident.
This will be explained below based on Figure 0.

FIG. 2 is a perspective view showing the base structure of the vacuum tube type solar heating device 1 in which a plurality of vacuum tube units 2 are all arranged in parallel, and the fifth factor is a partial sectional view of the vacuum tube unit 20 in FIG. 6 is the bottom of the glass tube 4 with the inside evacuated and the left and right J! ! It is a planar reflecting plate which is formed of a straight line and a curved line facing the glass tube 4. Reference numeral 5.5 denotes two heat collecting tubes which are arranged symmetrically on the left and right with the center line of the reflection plate 5 disposed inside the glass tube 4 at the upper center of the left and right impolyne bending positions. 6, the collector #I''W5.5 is tat and the heat collector tube 5.
A receiving plate 7.7 is provided which extends from the outer periphery of the plate 7.7 to the upper part near the mounting position of the right and left cylinders and slopes on both sides.The tips of the plates 7.7 are connected together to form a closed loop. It is a heat collector with an approximately inverted triangular cross section.

In addition, as another embodiment of the heat collector 6, as shown in FIG. 4, the lower part may not be connected and an open bottom part t- may be provided. However, if the opening is made too large, the amount of radiant heat dissipated from the inner surface of the heat collector 6 will increase, which will impair the advantages of the soft-light type fruit heater, which is not preferable. Further, as shown in FIG. 5, a bending knife may be further applied to the lower part of the inclination IR to form a straight shaft portion and form a closed loop. Figure 6, Figure 7 and Figure 8 are Figure 5;
This is an f+ view showing the light trail when the incident angle is 55 degrees using the heat collector 6 of FIGS. 4 and 5. In the heat collector 6 of FIG. The light is focused on the heat collector 6.

FIG. 9 is a graph showing the relationship between the ratio of sunlight that is incident on the aperture of the reflector and that is focused on the heat collector, that is, the light collection efficiency and the angle of incidence of sunlight.

a is the case of inside the leaf shown in FIG. 1, b is the case of %C in FIG. 6, and a is the total light collection efficiency of the heat collector shown in FIG. Regarding the light collection efficiency a in the involute reference circle, when the incident angle exceeds 20 degrees, the rapid withdrawal RC light collection efficiency decreases, whereas in the case of other 5-type heat collectors, it is very low. At 76%, it can be seen that the light collection efficiency has been significantly improved. -10, In order to investigate the influence of the IJk heating element wandering structure of the present invention on heat collection efficiency, the increase and decrease in efficiency was calculated based on -8- when all 8 heat collectors were used in the impolineated base leaf. Shown in the figure. The calculation takes into account air conditioning in the summer, and the average water sieve temperature is 90°C. In the same figure, e,
Points f and H correspond to the heat collector structures shown in FIGS. 6, 7, and 8, respectively. When compared with the case where Impoliate standard F38 is used as a heat collector, assuming that the light collection efficiency is the same, it can be seen that the efficiency decreases by 5 to 6% in the heat collector structure of the present invention. However, as is clear from FIG. 9, this degree of instantaneous efficiency decline can be sufficiently compensated for by the angle of incidence of the light collection efficiency, resulting in a large significant difference in the average efficiency over 5 years. At least 2 above the plate curve abutment
The heat collecting pipes were arranged side by side, and the heat collecting pipes were configured with a substantially inverted triangular heat collecting body having at least a flat part and a diagonal part facing both 41JI on the upper surface, so that the heat collecting pipes were arranged in parallel. Even if sunlight is irradiated from any direction, the entire optical axis from above is focused on the heat collector.The heat collector structure has less dependence on the sunlight incident angle, and the heat collection efficiency is improved. Evil〇6-

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional implementation full, Fig. 2 is an overall f+ view showing an embodiment of the present invention, Fig. 6 is a partial wr view of Fig. 2, and Figs. 6 is a schematic view showing other embodiments, FIGS. 6 to 8 are cross-sectional views showing the non-inventive light condensing state, and FIG. 9 is an incident angle temporal diagram of the non-inventive light-incoming efficiency. ,
FIG. 10 shows the relationship between radiant radiation and heat collection efficiency. Explanation of symbols 1 Vacuum tube type solar heat collector 2 Vacuum tube unit 3 Reflector plate 4 Glass tube 5 Heat collection tube 6 Heat collector 7 Heat receiving plate 8 Reference circle ・ 9 /l, trace 10 Partial representative patent attorney who does not collect light n Young Kunihiko Hayashi 7- Fig. 1 Fig. 2 Fig. 6 Fig. 7 Fig. 9・-Pa b゛／ ゝ、ノ工0.8 ＼l′ 、゛・-′Rotatami 1<,,-～-IL-- ) Figure 8, continuation of page 1 0 Inventor Masaru Itabashi Hiko Hitachi Chemical Co., Ltd. Shimodate Research 92, 11500'l, Oaza Small J1 Office, Shimodate City
1-

Claims (1)

[Scope of Claims] 1. Inside the glass tube ((C) is provided with a reflecting plate whose cross-sectional shape is symmetrically curved and a straight line extended from the curve tl, and a heat collecting tube is provided above the reflecting plate to form an fc condensing vacuum tube type. In a solar heat collector, at least two heat collecting pipes are arranged in parallel above one reflector curve, and the heat collecting pipes have a substantially inverted triangular shape having a flat part on at least the upper surface and oblique parts on both sides. 2. The lower part of the heat collector is formed into an inner closed loop shape or an open loop shape. The heat collector structure 03 of the vacuum tube type solar heat collector according to claim 1, which is characterized by a t% characteristic, and the true wall according to the claim, characterized in that the opening of the reflecting plate is an impolyne bending. Heat collector structure of a tubular solar collector.