JPS608280Y2 - solar heat collector - Google Patents

Description

[Detailed description of the invention] This invention consists of a heat collecting tube and a heat exchanger to form a sealed passage, and a working fluid that changes into two phases of gas and liquid is sealed inside the waist, and solar energy is generated by using the latent heat of vaporization of the working fluid. This invention relates to an improved structure of a solar heat 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 tube arranged in a meandering manner on a heat collecting plate 2, and 3 is an indirect heat exchanger consisting of an inner and outer tube arranged above the heat collecting pipe 1. The second portion 3b is arranged between the first portion 3as, through which the liquid to be heated passes through the inner tube, and the inner and outer tubes.

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; 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; 4. The second portion 3b of the heat exchanger 3 and the liquid return pipe 5 form a sealed passage, and an appropriate amount of a working fluid that changes into two phases, such as fluorocarbon, is sealed inside.

When the heat collecting tube 1 is heated by sunlight irradiation, the working fluid inside evaporates, and the steam is sent to the second part 3b of the heat exchanger 3 through 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 thermal 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, it is difficult for the working fluid condensed in the heat exchanger 3 to return to the heat collecting pipe 1, and it remains inside the heat exchanger 3. The heat exchange efficiency was getting worse.

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

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

In the present invention, the inner diameter of the liquid return pipe 5 is separated by at least a predetermined dimension from the communication part 6 between the liquid return pipe 5 and the second part 3b of the heat exchanger 3. It is larger than the caliber.

In reality, this can be achieved by using a liquid return pipe 5 having a larger diameter than the steam passage pipe 4.

In addition, as shown in FIGS. 3 and 4, a steam passage pipe 4 and a liquid return pipe 5 are provided.
A large diameter part 8 is provided in the communicating part 6 with the second part 3b of the liquid return pipe 5 with the inner diameter increased by a predetermined dimension from the communicating part 6 so as to have a liquid reservoir function. .

Therefore, in the present invention, the working fluid condensed in the heat exchanger 3 immediately flows down into the liquid return pipe 5, which has a large inner diameter, and does not remain in the heat exchanger 3 and reduce the heat exchange efficiency as in the conventional case. This brings about effects such as being able to effectively transmit solar thermal energy to the liquid to be heated.

[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 sectional view of. 1... Heat collection pipe, 3... Heat exchanger, 3a
....First part, 3b...Second part, 4
...Steam passage pipe, 5...Liquid return pipe.

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 second part and the upper end of the heat collecting pipe and a liquid return pipe that connects the lower end of the second portion with the lower end of the heat exchanger. A working fluid that changes into two phases of gas and liquid is sealed inside the sealed passage, and the inner diameter of the liquid return pipe is separated by at least a predetermined dimension from the communicating part between the liquid return pipe and the second part. A solar heat collector whose opening diameter is larger than the opening diameter of the communication part between the two parts.