JPS6012996Y2 - solar heat collector - Google Patents

Description

[Detailed explanation of the invention] This invention aims to suppress the temperature rise during dry firing of solar heat collectors using heat pipes, expand the range of use, and improve safety and lifespan. The project aims to provide a solar heat collector.

As shown in Figs. 1 and 2, a conventional solar heat collector using a heat pipe for heat collection is a system in which a working fluid such as water is sealed in a plurality of outer tubes 1 with one end sealed. The end of the heat collecting heat pipe 3 is inserted through the sealing plate 4 that seals the opening of the outer tube 1 by inserting the heat absorbing parts of the heat collecting heat pipe 3 to which the heat plate 2 is thermally attached. Derive each part.

At the same time, the fins 5 are integrally attached to the heat radiating part at the end of each of the led out heat collecting heat pipes 3 to form a heat exchange part 6 as a heat transfer area. A circulation pipe 7 for a heat medium that circulates through a heat storage tank and receives heat in the heat exchange section 6 is attached to the heat exchange section 6, and the heat exchange section 6 is covered with a heat insulator 8 to provide heat insulation from the outside.

Then, when the heat absorption part of the heat collection heat pipe 3 is heated through the heat collection plate 2, the working fluid in the heat collection heat pipe 3 evaporates and moves to the heat radiation part, and in the heat exchange part 6. The working fluid is liquefied by applying heat to the circulating heat medium and returns to the heat absorption part of the heat collecting heat pipe 3 again.

By repeating the above operations, solar heat is collected and supplied to the heat medium.

However, when the heat medium is circulated using the natural circulation method, the heat medium in the heat storage tank runs out, or when the heat medium is circulated using the forced circulation method, the heat medium stops circulating due to a power outage, etc., and the dry heating occurs. In this state, the working fluid in the heat collecting heat pipe 3 turns into high-pressure superheated steam.

For example, if the working fluid is water, it becomes superheated steam at 300°C with a pressure of just under 1 ambient pressure ↓ As a result, the solar heat collector may be damaged or the working fluid may thermally decompose, causing solar heat to be collected. There is a drawback that it will not be possible to

This idea was made keeping in mind the above table,
Next, this invention will be explained in detail with reference to the curved surfaces shown in FIG. 3 and subsequent figures showing an embodiment thereof.

First, FIG. 3 showing the first embodiment will be explained.

In the figure, the same symbols as in Figures 1 and 2 indicate the same things, and the difference from Figures 1 and 2 is that the working fluid contains high boiling point liquids, such as diphenyl oxide and diphenyl. A heat pipe 9 for high temperature operation using a mixture, alkylnaphthalene, mineral oil, etc. is provided, and the heat absorbing part 10 of the heat pipe 9 for high temperature operation is brought into contact with the heat radiation part of the heat pipe 3 for collecting heat, The heat dissipation section 11 of the heat pipe 9 for high temperature operation is led out from the heat exchange section 6 to the outside of the heat insulator 8.

The working fluid of the heat pipe 9 for high temperature operation is 100
At temperatures below 'C, its vapor pressure is low and it does not operate as a heat pipe, so its thermal conductivity is low and less heat is released to the outside.

On the other hand, when the temperature reaches 150°C or higher, the vapor pressure of the working fluid in the heat pipe 9 for high-temperature operation becomes high, and it starts to operate as a heat pipe, and the heat from the heat dissipation part of the heat pipe 3 for heat collection is used for high-temperature operation. Heat is radiated to the outside from the heat radiating part of the heat pipe 9.

Therefore, according to the embodiment, at normal operating temperatures, that is, below 100° C., only the heat collecting heat pipe 3 operates to collect solar heat, and at that time, the high temperature heat pipe 9 does not operate. The heat of the heat exchange section 6 is supplied only to the heat medium, and no heat is released to the outside.

On the other hand, when the dry firing state occurs and the temperature reaches a higher temperature than the normal operating temperature, for example 150C, the high temperature operation heat pipe 9 is activated and the heated heat of the heat exchange section 6 is transferred to the outside by the high temperature operation heat pipe 9. The heat pipe 3 for collecting heat using high-pressure superheated steam radiates heat to suppress the temperature rise in the heat exchange section 6 to a low level.
In addition to preventing damage to the heat pipe 3, thermal decomposition of the working fluid inside the heat collecting heat pipe 3 can be prevented. Therefore, the range of use of solar heat collectors can be expanded, and safety and lifespan have been improved. can be done.

Note that the heat radiation section 1.1 of the heat pipe 9 for high temperature operation led out from the heat exchange section 6 can also be connected to another heat storage tank or the like.

Next, FIG. 4 showing another embodiment will be explained.

In this figure, the difference from FIG. 3 is that the heat radiating part of each of the heat collecting heat pipes 3 is inserted into the heat storage tank 12 to create a heat collecting system i=, and the heat radiating part of the heat collecting heat pipe 3 is inserted into the heat storage tank 12. The heat collecting part 10 of the heat pipe 9 for high temperature operation is brought into contact with the heat sink 10 of the heat pipe 9 for high temperature operation, and the heat radiating part 11 of the heat pipe 9 for high temperature operation is brought into contact with the heat storage tank 1
2, the heat medium in the heat storage tank 12 circulates in a natural circulation manner, and when the temperature reaches a higher temperature than the normal operating temperature, the heat pipe 9 for high temperature operation is activated as described above. The temperature rise in the heat exchange part 6 of the heat collecting heat pipe 3 is suppressed to a low level.

As described above, the solar heat collector of this invention includes a heat collection heat pipe and a high temperature operation heat pipe that operates at a higher temperature than the normal operating temperature of the heat collection heat pipe. A heat dissipation section of a heat pipe is provided in a heat exchange section that supplies heat to a heat medium, and a heat absorption section of the heat pipe for high temperature operation is in contact with a heat dissipation section of the heat collection heat pipe, and By leading out the heat dissipation part of the heat pipe from the heat exchange part, it is possible to suppress the temperature rise during dry firing, expand the range of use, and improve safety and life.

[Brief explanation of drawings]

Figure 1 is a perspective view of a conventional solar heat collector, Figure 2 is a cutaway front view of Figure 1, Figures 3 and 4 show an embodiment of the solar heat collector of this invention, and Figure 3 is a perspective view of a conventional solar heat collector. 4 is a partially cutaway front view of the first embodiment, and FIG. 4 is a partially cutaway perspective view of another embodiment. 3...Heat pipe for heat collection, 6...Heat exchange section, 9...Heat pipe for high temperature operation, 10
... Heat absorption part, 11 ... Heat radiation part.

Claims (1)

[Scope of utility model registration request] A heat exchange unit that includes a heat collection heat pipe and a high temperature operation heat pipe that operates at a higher temperature than the normal operating temperature of the heat collection heat pipe, and supplies heat to a heat medium from the heat radiation part of the heat collection heat pipe. The heat absorbing part of the heat pipe for high temperature operation is in thermal conductive contact with the heat radiating part of the heat pipe for collecting heat, and the heat radiating part of the heat pipe for high temperature operation is connected to a solar heat collector led out from the heat exchange part. Heater.