JPS6022284Y2 - solar heat collector - Google Patents

Description

[Detailed description of the invention] This invention consists of a heat collecting tube and a heat exchanger that form a sealed passage, and a working fluid that changes into two phases, vapor and liquid, is sealed inside, and the latent heat of vaporization of the working fluid is used to generate solar heat energy. This invention relates to an improved structure of a solar collector that transmits heat to a heated liquid such as water.

Figure 1 shows a solar heat collector with a conventional structure, in which 1 is a heat collecting pipe arranged in a meandering manner on a heat collecting plate 2, and 3 is an indirect heat exchanger consisting of inner and outer pipes arranged above the heat collecting pipe 1. A first part 3a through which the liquid to be heated passes through the inner tube and a second part 3 between the inner and outer tubes.
It is composed of b.

4 is a steam passage pipe that connects the upper end of the heat collecting pipe 1 and the upper part of the second part 3b; 5 is a liquid return pipe that connects the lower end of the heat collecting pipe 1 and the lower part of the second part 3b; The pipe 4, the second portion 3b of the heat exchanger 3, and the liquid return pipe 5 are made into a sealed passage,
An appropriate amount of working fluid that changes into two phases, such as fluorocarbon, is sealed inside.

When the heat collection tube 1 is heated by sunlight irradiation, the working fluid inside evaporates, and the evaporation is sent to the second part 3b of the heat exchanger 3 via the steam passage pipe 4, where the first Latent heat is released into the heated liquid such as water flowing through the portion 3a to heat the liquid, and the liquid itself condenses and becomes a liquid. It flows down and repeats evaporation here, transmitting solar energy to the heated liquid.

However, since the inner diameters of the steam passage pipe 4 and the liquid return pipe 5 are the same and the diameters are not that large, the working fluid condensed in the heat exchanger 3 does not return well to the heat collecting pipe 1, and some liquid remains in the heat exchanger 3. The storage heat exchange efficiency had deteriorated.

The present invention was devised in view of this point, and will be explained below with reference to FIG.

The basic structure and heat transfer operation are the same as the conventional one shown in FIG. 1, so the same reference numerals are given.

In the present invention, a liquid reservoir 6 is formed in the lower part of the second portion 3b of the heat exchanger 3, and a liquid return pipe 5 is communicated with the lower part of the liquid reservoir 6.

Therefore, in the present invention, the working fluid condensed in the heat exchanger 3 accumulates in the fluid reservoir 6 and then returns to the heat collecting pipe 1 from the fluid return pipe 5, so that the working fluid remains in the heat exchanger 3. Therefore, there is no reduction in heat exchange efficiency when the second portion is filled with the working fluid, and solar energy can be effectively transmitted to the heated fluid.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the conventional structure, Fig. 2 is a plan view of the solar heat collector of the present invention, Fig. 3 is an enlarged sectional view of main parts showing another embodiment of the present invention, and Fig. 4 is Fig. 3 It is an AA enlarged sectional view of. 1... Heat collection pipe, 3... Intermediate heat exchanger, 3a...
...1st part, 3b...2nd part, 4...:-
Steam passage pipe, 5...liquid return pipe, 6...curved liquid reservoir section.

Claims (1)

[Scope of utility model registration request] A heat exchanger comprising a heat collecting pipe, a first part located above the heat collecting pipe and through which the liquid to be heated passes, and a second part located in a heat exchange relationship with the first part; the heat collecting pipe, the steam passage pipe, the second part of the heat exchanger, and the liquid return pipe. A solar heat generating system is formed by forming a sealed passage, sealing therein a working fluid that changes into two phases of gas and liquid, and forming a liquid reservoir in the lower part of the second part, and communicating the lower part of the liquid reservoir with a liquid return pipe. Heat collector.