JPS5930360Y2 - solar heat collector - Google Patents

Description

[Detailed explanation of the idea] This proposal concerns a solar heat collector using heat pipes.

Although solar heat collectors using heat pipes are inferior in terms of heat transfer efficiency compared to those that directly heat the fluid to be heated such as water with solar radiation heat, there is no reverse heat transfer and there is less heat loss. Therefore, its use in solar heat collectors is increasing.

However, so-called gravity circulation type heat pipes (hereinafter simply referred to as heat pipes), which circulate the heat medium by gravity without forming a wick on the inner surface of the heat pipe, have a simple structure, but the heat medium cannot be heated sufficiently. Until this happens, only the portion of the inner wall where liquid accumulates in a gravitational field is filled with a heat medium, so it has the disadvantage that it is difficult to function as a heat pipe in the early stages of operation of the collector.

In view of this point of the present project, the activation of the solar heat collector using heat vibrator is improved, and the heat collection efficiency is improved.
The explanation will be given below according to the drawings. In FIG. 1, 1 integrally forms a heat collection box 2 and a hot water tank 3;
This is a solar heat collector that conducts the solar radiant heat obtained in the heat pipe 4 to the hot water tank 3. The heat collecting part 4a is a heat collecting part 4a, the part that is in contact with the heated fluid 5 and imparting the sensible heat and latent heat of the gaseous heat medium to the heated fluid 5 is a heat radiating part 4b, and the heat collecting part 4a is connected to the heat collecting box 2. ,
A heat radiating part 4b is arranged in the hot water tank 3.

Further, a heat collecting plate T is attached to the outer surface of the heat collecting portion of the heat pipe 4 in the form of wings.

Therefore, in the solar heat collector 1 using such a heat pipe, the liquid phase heat medium condensed in the heat radiation part 4b flows down to the heat collection part 4a by gravity, and the liquid phase heat medium flows down to the heat collection part 4a. Since redispersion throughout 4a is performed by boiling bubbles of the heating medium, when the amount of solar radiation heat is small and the entire liquid phase does not boil, the liquid phase heating medium is not dispersed, and therefore the solar heat collector also The problem was that it was difficult to operate.

In view of this, the present proposal involves inserting a metallic heating plate with a side edge facing the heat collecting plate into the inner surface of the heat collecting part where the liquid phase heat medium is collected before starting the heat pipe. This allows the heat pipe to start operating quickly, and will be explained below according to the drawings. In Fig. 2, 6 is an example of a metal heating plate inserted into the heat pipe 4. The width W of the heating plate is such that it can be press-fitted into the heat pipe 4, and heat-receiving side edges 6' that are in close contact with the inner wall of the heat pipe 4 are formed on both sides, and are located at the heat radiation part 4b of the heat pipe. A tip 6a serving as a boiling nucleus is formed on the side.

The heating plate 6b has a side edge 6' that collects heat on the inner surface of the part where the heat medium liquid sealed in the heat pipe is collected before heating the heat collecting part 4a of the heat vibrator (before starting). The heat that is press-fitted with a structure that faces the plate 7 and is transferred from the heat collecting plate 1 to the tube wall of the heat pipe 4 is quickly transferred to the heating plate 6, and can heat the M body in the center part away from the tube wall. Particularly, the heat obtained by the heating plate 6 is intensively transferred to the heating medium located near the boiling nucleus 6a, thereby causing local boiling to occur quickly.

That is, when solar radiation heat is transferred to the heat collecting part 4a of the heat pipe, this heat is located at the part of the heat pipe wall facing the contact surface 8 of the heat collecting plate 7, which is under the highest temperature condition. The second part of this heat intensively heats the heat medium liquid near the boiling core 6a of the heating plate, causing partial boiling there, and the boiling The bubbles quickly disperse the liquid phase heat medium throughout the heat collecting section 4a.

Therefore, the drawback of the conventional gravity circulation heat vibrator, which is that it is difficult to fully demonstrate its function as a solar heat collector until the entire liquid phase part of the heat pipe starts to boil, has been overcome, and it can be done relatively quickly. , it is possible to collect heat in the entire heat collecting section.

In addition, conventionally, when the amount of solar radiation is low, the upper part of the heat collecting part (the part where only the gaseous heat medium exists) is overheated unless the entire liquid heat medium part boils. However, in this case, the heating medium liquid can be dispersed even above the heat collecting part by partially boiling the heating medium, so it can be collected even when the amount of solar radiation is small. Thermal function can also be significantly improved in dogs.

Incidentally, the boiling nucleus is not limited to the tip 6a, but may be formed as a suitable heat concentration transfer surface without departing from the idea of the present invention.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of the solar heat collector of the present invention using heat pipes, Fig. 2 is a perspective view of the main parts with a portion cut away,
FIG. 3 is a cross-sectional view, and FIG. 4 is a perspective view showing an example of the structure of the heating plate. 4... Heat pipe, 4a... Heat collecting section, 4b... Heat radiation section, 6... Heat plate, 7
・・・・・・Heat collecting plate.

Claims (2)

[Scope of utility model registration request] (1) A heat collecting plate is attached in the shape of a wing to the outer surface of the heat collecting part of the heat pipe, and a metal heating plate is inserted inside the heat collecting plate,
A solar heat collector in which a side edge of the heating plate is brought into contact with an inner wall at a position facing the heat collecting plate. (2) Utility Model Registration A solar heat collector characterized in that the heating plate according to claim 1 has boiling nuclei in part.