JPS61151291A - Heat carrying sphere - Google Patents

Abstract

PURPOSE:To provide a heat carrying sphere which, when added to a carrier liquid for a heat carrying system, carries upper heat downwards automatically, prepared by providing a means to reduce the volumes of a heat storing chamber, a gas chamber and a vacant space when the temperature is high and increases the volumes when the temperature is low. CONSTITUTION:Semispherical heat storing chambers 1, 1 are provided on the upper and lower sides of an outer shell 2. An air chamber 5 isolated from exterior with a stretchable water sealing membrane 4 is provided in a hole 3 between the heat storing chambers 1, 1 and a piston 6 and a shape memory alloy 7 as means to reduce the volume of the air chamber 5 when the temperature is high and increase it when the temperature is low, are placed in it. When the heat carrying sphere 8 is put in a heat transfer system such as a solar water heater, the volume of the air chamber 5 is reduced by the action of the shape memory alloy 7 and the piston 6, causing the heat carrying sphere 8 to have a higher apparent specific gravity than the carrier liquid and settle down to carry upper heat downwards automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to heat transfer particles used in a carrier liquid of a heat transfer system.

Conventional Technology Devices that obtain hot water using solar collectors have been used for a long time to effectively utilize natural energy.

The general configuration of the solar hot water system will be explained with reference to FIG. 3, where the heat collector 101 is located above the roof, etc.
On the other hand, the heat storage tank 102 is located on the ground, and the pump 103 is driven to transport the heat medium from the heat storage tank 102 to the heat collector 101.

Problems to be Solved by the Invention However, the heating medium circulation type solar water heating system having the heat storage tank 102 consumes a large amount of power for transporting the heating medium.
Although the energy saving effect could not be fully demonstrated, there were some negative aspects. In other words, the specific gravity of the heating medium is small at high temperatures and large at low temperatures, so if there is a heat source above, natural convection will not occur, and in order to recover heat, it is necessary to circulate the heating medium using power. However, there was a problem in that the power consumed for this was extremely large.

Therefore, in order to transport the heat medium in the heat transfer system without using a pump, the present invention makes it possible to automatically transport the heat medium by placing it in the carrier liquid of the heat transfer system. Some provide heat transport particles.

Means for Solving the Problems The heat transport particles of the present invention that solve the above problems include a heat storage section, a void section in which gas is sealed, and a means for reducing the volume of the void section at high temperatures and increasing it at low temperatures. It is equipped with the following.

Function Since the heat transfer particles of the present invention are configured as described above, when they are used in large numbers in the transfer liquid of a heat transfer system, their apparent specific gravity becomes larger than that of the transfer liquid at high temperatures and they settle, and at low temperatures they settle. Since the apparent specific gravity becomes smaller than that of the conveyed liquid and it floats, the heat from above is automatically conveyed downward without using conveying power.

EXAMPLE An example of the heat transport particles of the present invention will be explained with reference to FIG. FIG. 1 is a cross-sectional view of a heat transport particle, in which the upper and lower hemispheres are heat storage parts 1 made of a material with a large specific heat, and are housed in an outer shell 2. One hole 3 is provided in the outer shell 2, and within the hole 3 is provided an air chamber 6 in this example, which is partitioned from the outside by an expandable water-sealing membrane 4 and is filled with gas. A water sealing membrane 4 [
A movable part, in this example a piston 6, is provided and the piston 6
One end of a shape memory alloy 7, which changes with temperature changes, which is shaped like a spring in this example, is directly connected to the acting part, and the other end is fixed to the other end of the air chamber 5.

The heat transfer particles 8 of the embodiment configured as described above are 6) shape memory alloy 7 formed in the shape of a spring in the air chamber 5 at high temperature.
returns to its coil shape, the piston 6 is pulled, the volume of the air chamber 6 decreases, and the apparent specific gravity increases. On the other hand, when the heat storage section 1 radiates heat and reaches the phase change temperature of the shape memory alloy 7, the tensile force is lost, the internal pressure of the air chamber 6 pushes the piston 6, and the volume of the air chamber 6 increases, causing the apparent Specific gravity becomes smaller.

Therefore, as shown in FIG. 2, a large number of heat transfer particles 8 are placed in the transfer liquid 10 in the heat transfer system pipe 9,
If the apparent specific gravity is adjusted according to the specific gravity of the carrier liquid 10, when the temperature is high, the apparent specific gravity becomes larger than that of the carrier liquid 10, and the liquid 10 sinks, and at low temperatures, the apparent specific gravity becomes smaller than that of the carrier liquid 10, and it floats, so that the upper heat is absorbed. can be automatically transported downward using transport power.

In the embodiment described above, the shape memory alloy 7 formed in the shape of a spring is used for the action part that controls the volume of the air chamber 5, but a bimetal may also be used.

Further, a metal or the like having a high expansion coefficient can also be used.

However, if a shape memory alloy or bimetal is used, heat recovery occurs only when heated above a certain temperature, so heat dissipation due to low temperature operation can be avoided.

Further, in the above embodiment, the shape memory alloy 7 formed in the shape of a spring is provided in the air chamber 6 to control the volume of the air chamber 6. The volume may be reduced by compressing it.

Note that if a latent heat storage material is used in the heat storage section 1, a large amount of heat can be transported with a small volume. When the transition temperature of the shape memory alloy and the phase transition temperature of the latent heat storage material are close to each other, if the shape memory alloy is installed in the latent heat storage material, the storage and radiation of latent heat can be fully utilized.

Effects of the Invention As can be seen from the above explanation, when the heat transfer particles of the present invention are used in the carrier liquid of a heat transfer system, the apparent specific gravity becomes larger than that of the carrier liquid at high temperatures and settles, and the apparent specific gravity decreases at low temperatures. Since the liquid becomes smaller than the conveyed liquid and floats, the energy of the heat source located above can be automatically conveyed downward without using conveying power. Therefore, by employing this in a solar hot water system, the driving force of the pump for circulating the heat medium can be significantly reduced, resulting in a large energy saving effect.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of the heat transport particles of the present invention;
FIG. 2 is a schematic diagram showing a state in which the heat transport particles of the present invention are placed in a transport liquid of heat transport system piping, and FIG. 3 is a schematic diagram showing the general configuration of a solar water heating system. 1... Heat storage part, 2... Outer shell, 3...
... Hole, 4... Expandable water seal membrane, 5...
...Air chamber, 6...Piston, 7...
・Spring-shaped shape memory alloy, 8... Heat transport particles, 9... Heat transport system piping, 1o...
...Transportation liquid.

Claims (5)

[Claims] (1) A heat transporting particle characterized by comprising a heat storage part, a cavity in which gas is sealed, and means for increasing the volume of the cavity from a volume at high temperatures to a volume at low temperatures. (2) The means for reducing the volume of the cavity at high temperatures and increasing it at low temperatures is provided by at least one movable part provided on the outer shell of the cavity, and the mechanism that is directly connected to the movable part and whose shape changes with temperature changes. The heat transport particle according to claim 1, characterized in that the heat transport particle is constituted by a portion. (3) The heat transport particle according to claim 1, wherein the heat storage portion is made of a latent heat storage material. (4) The heat transport particle according to claim 2, wherein the action portion is made of a shape memory alloy. (5) The heat transport particle according to claim 2, wherein the action portion is made of bimetal.