JPS5930866Y2 - solar heat collector - Google Patents

Description

[Detailed explanation of the invention] Solar heat collectors using heat pipes are known as high-performance types, and in particular those in which the heating part of the heat pipe that is exposed to sunlight is housed in a vacuum tube are used for heating liquids that need heat exchange in the summer. When dry firing is not present, the temperature in the condensing section rises to over 200℃, causing the internal working fluid to deteriorate or decompose and generate non-condensable gas, reducing the heat transport efficiency and service life of the heat pipe. descend.

In view of this, the present invention aims to eliminate the above-mentioned drawbacks by releasing the abnormal temperature during dry firing into the atmosphere.

One embodiment will be described below with reference to the drawings. Reference numeral 1 denotes a heat exchange tank surrounded by a heat insulating material 2, in which a heat medium 3 such as silicone oil that expands thermally is stored.

Reference numeral 4 denotes a heat dissipating member made of copper, aluminum, etc., which is attached to the top opening of the heat exchange tank 1, with heat dissipating fins 4a extending toward the outside of the tank.
Heat absorbing fins 4b are integrally provided inwardly.

The tips of the heat-absorbing fins 4b are not normally in contact with the heat medium 3, but when the heat medium 3 is abnormally heated, for example, heated to 100° C. or higher, the liquid level rises due to thermal expansion, and the tips are immersed in the heat medium and are heated. Heat is absorbed from the medium 3 and radiated to the atmosphere through the radiation fins 4a, thereby lowering the temperature of the heat medium 3.

5 is a heating part 5a installed in a vacuum glass tube 6, and a condensing part 5b
When the heating section 5a is exposed to sunlight using a heat pipe immersed in the heat medium in the heat exchange tank 1, the working fluid inside evaporates, heats the heat medium 3 in the condensing section 5b, and liquefies itself. Heat transport is carried out by repeating the cycle of flowing down to the heating part 5a by gravity and being evaporated by sunlight again.

A heat exchanger 7 is connected to a hot water tank or city water and flows a heated liquid such as water, and is immersed in the heat medium 3 to exchange heat with the heat medium and take out hot water.

Reference numeral 8 denotes a heat insulating material attached to the back surface of the heat radiating member 4.

During normal operation when heating liquid is flowing through the heat exchanger 7, the temperature of the heat medium 3 is below 100°C, and therefore the thermal expansion of the heat medium is small and the heat absorption fins 4b of the heat dissipation member 4 are in contact with the heat medium. In contact state.

Therefore, almost no heat is radiated from the heat radiating member 4.

- Ancient People In the case of a so-called dry firing state where there is sufficient sunlight and heating water is not used or heating water does not flow to the heat exchanger 7 due to a malfunction, the heat medium temperature will rise to 100°C or higher, and as a result, the heat medium will Thermal expansion causes the liquid level to rise, and the heat-absorbing fins 4b are immersed in the heat medium 3 to absorb heat and radiate it to the atmosphere from the heat-radiating fins 4a, thereby preventing the temperature of the heat medium from rising.

Therefore, the present invention avoids deterioration and decomposition of the working fluid in the heat pipe 5, and eliminates the conventional drawbacks.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the main parts of the solar heat collecting device of the present invention, and FIG. 2 is a cross-sectional view of the main parts at the same time of abnormality. 1...Heat exchange tank, 3...Heat medium, 7.
... Heat exchanger, 4 ... Heat dissipation member, 4b.
... Heat absorption fin, 4a ... Heat radiation fin.

Claims (1)

[Scope of utility model registration request] The condensing part of the heat pipe, whose heating part is exposed to sunlight, and the heat exchanger through which the heating liquid flows are immersed in a heating medium stored in a heat exchange tank, so that solar heat is transferred to the heating liquid through the heating medium. None A heat radiating member is attached to the upper opening of the heat exchange tank, and the heat radiating member has heat radiating fins facing the outside of the tank and heat absorbing fins facing inward. A solar heat collector configured so that it comes into contact with a heat medium when the liquid level rises due to expansion.