JPS6298153A - Heat storage apparatus - Google Patents

Abstract

PURPOSE:To make it possible to feed heat of a predetermined constant temperature and to store heat in a heat storage material using susplus electric power and the like by providing in a vessel a number of unit heat storage members of polyethylene absorbing and discharging latent heat, sealing a heat transfer medium and providing an electric resistance heat generator. CONSTITUTION:A heat storage material 23 is formed by arranging a plurality of unit heat storage members consisting of rod-shaped high-density polyethylene and absorbing and discharging latent heat at approximately 130 deg.C in a required interval. A heat transfer medium 24 which is difficult to interfere with the heat storage members makes direct contact with the peripheries of the heat storage members, thus conducting heat transfer. A vessel 25 is formed from a metal excellent in heat conductivity, and an electric resistance heat generator 26 is supplied at its terminals 27 with power utilizing midnight power, solar heat, wind force and the like. On support plates 28 of the medium 24, a large number of through holes are formed, and a heat insulating material 29 which is easily opened or closed and freely attachable to and detachable from to the vessel 25 is provided.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to surplus time period electrical energy such as power from pericarp, power for adjusting load fluctuations, or highly variable energy such as solar power, wind power, and wave power. The present invention relates to a heat storage device fK that can convert thermal energy, store it, and extract it as stable thermal energy.

[Conventional technology]

Fig. 4 is a partially cutaway perspective view of an example of a late-night power water heater as a conventional sensible heat storage device, in which 1 is a container, 2 is water which is a heat storage material and also serves as a heat medium, and 3 is an electricity source. 4 is a terminal, and 5 is a convection prevention plate.

FIG. 5 is a perspective view showing an example of a conventional sensible heat type heat storage device and a warm air heater for forming dry fruit peels, in which 11 is a brick as a heat storage material, 12 is a blower, 13 is cold air, is warm air.

[Problem that the invention seeks to solve]

By the way, the conventional late-night power water heater shown in FIG. 4 is a sensible heat type heat storage device that pressurizes 2 YlF of water in a container 1 and stores heat at a temperature of 100° C. or more.
Because it is necessary to use a pressurized container 1, the container 1 must be made of a steel plate that has strength and durability that exceeds the thickness considering the safety factor, and only uses sensible heat. Although the shape of the container 1 becomes larger and the burden increases, there is a problem in that it is not possible to obtain a material that satisfies the heat storage density. There is a thermal storage heating system that uses accumulated late-night electricity.
This device ILVc also utilizes sensible heat, so
Despite the increased size and weight, the heat storage density was also insufficient.

! ! Because of the poor heat conduction, countermeasures have been taken such as making the bricks 11 used as heat storage materials granular, having uneven surfaces, or having porous shapes, but as a result, the bricks 11 are broken, cracked, or powdered. There were problems such as the particles forming and scattering. Furthermore, it is currently difficult to popularize it due to problems such as secondary processing being almost impossible.

Since the above-mentioned conventional examples are all heat storage devices using sensible heat, there are problems such as the output decreases by 1 degree over time during use (and the desired temperature cannot be constantly obtained).

Conventionally, it was not possible to find a heat storage material that absorbs and releases latent heat at around 130°C and is chemically stable, making it impossible to obtain a stable temperature at this temperature level.
There was no equipment either.

The present invention has been made to solve the above-mentioned problems.In contrast to the conventional heat storage device which utilizes only the apparent heat, the present invention utilizes the latent heat. Good luck and constant I! ! The purpose of the present invention is to install a heat storage device that can supply heat at a temperature of 100°C, and also heats an electric resistance heating element using electric power converted from surplus electric power or a labor-intensive energy source to store heat in a heat storage material.

[Means for solving problems]

The heat storage device t according to the present invention has a heat storage material made of a large number of unit heat storage elements made of polyethylene that absorbs and releases latent heat at around 130'C sealed in a container, and a heat transfer medium sealed in the container. At the same time, the number of Kt electric resistance heating elements in the container constitutes one heat storage device.

[Effect]

The heat storage material starts and ends heat storage due to the conduction of the electric resistance heating element, and heat absorption is performed at a substantially constant temperature, and heat is radiated at a substantially constant temperature during heat dissipation.

Furthermore, late-night electricity is reduced by installing an air resistance heating element,
Electricity during surplus hours or energy sources with large fluctuations such as sunlight and wind power are converted into thermal energy (stored and used as a stable heat source when needed).

〔Example〕

1(a) and 1(b) show an embodiment of the present invention, FIG. 1(a) is a perspective view, and FIG. 1(b) is a perspective view of FIG. 1(a).
) is a sectional view taken along line 1-1M. In these figures, the odor generator, 21 is a heat storage device, and 22 is a unit heat storage element, which is made of rod-shaped high-density polyethylene and is heated to around 130°C (approximately 2
Absorbs and releases 00KJ/Kg of latent heat. 23 is a heat storage material in which a large number of unit heat storage elements 22 are arranged at regular intervals; 24 is a heat transfer medium that does not easily interfere with the unit heat storage elements 22, such as ethylene glycol or propylene glycol; By directly contacting the surrounding VC of the unit heat storage element 22, heat transfer is performed by one heat transfer and convection.

Reference numeral 25 denotes a steel container in which the heat storage material 23 and the medium 24 are sealed, and is made of metal with good thermal conductivity. 26
is an electric resistance heating element, to which late-night power or power converted from solar power, wind power, etc. is supplied through a terminal 27. 28 is a support plate that supports the medium 24, and has a large number of through holes formed therein. Further, the support plate 28 may be a net-like plate. Further, 29 is a heat insulating material which can be easily opened/closed and removed from the container 25Vc.

2(a) and 2(b) show a mode in which heat transfer fins are attached to the outer wall of the container 25 shown in FIG. 1. FIG. 2(a) is a perspective view, and FIG. 2(b) is a perspective view. FIG. 2D is a cross-sectional view taken along the nn edge of 2D(a). The same reference numerals as in FIG. 1 indicate the same parts. 3
0 is a heat transfer fin attached to the outer wall of the container 25, and a heat storage material 23.0 is attached to the outer wall of the container 25. Endotherm of medium 24.

Promotes heat dissipation. In addition, the inner wall n of the container 25 may also be affected by volume changes due to the heat PIe tension of the unit heat storage elements 22 and the medium 24. Installation is also good.

Further, the high-density polyethylene used in the unit heat storage element 22 of the present invention may be cross-linked on the C surface or the entire surface, or may have an outer covering of cross-linked polyethylene, if necessary.

In addition to the unit heat storage element 22 made up of a large number of heat storage materials 23, it may be made of a large number of grains or cubes made of high-density polyethylene with a large number of through holes formed therethrough.

The properties of the high-density polyethylene used in this invention are shown in Table 1, and the heat storage properties include latent heat.

Figure 3 shows the heat dissipation characteristics.

Table 1 In this figure, t is the elapsed time of heat storage and heat utilization, T
is the temperature and Q is the heat t.

The heat storage material 23 has a latent heat of heat tQ at around T=130°C.
absorbs and releases at a rate of approximately 200 KJ/Kg. When the electricity in the surplus time period is passed through the electric resistance heating element 26 to generate heat,
The medium 24 causes convection, and the medium 24 having a high WVC at the bottom rises and transfers heat to the heat storage material 23 through direct contact. The heat storage material 23 is heated to around 130° C., absorbs m heat, and stores the heat. When all the heat storage materials 23 complete storing latent heat, the temperature starts to rise further. For heat dissipation, use insulation material 29 as necessary.
Remove the heat and use it.

The high-density polyethylene inside absorbs latent heat, even at high temperatures.
Since it is cross-linked, it has a high viscosity, has a stable shape due to the buoyancy of the medium 24, and has little distortion due to its own weight.

Unlike other latent heat storage materials, there is no amorphous shape in the liquid phase, and since it is in the medium 24 that does not easily interfere with 1L-rS, problems such as decomposition, reaction with residual oxygen, and viscous layer occur almost always. Direct contact heat transfer by the medium 24 and convection provide excellent heat transfer performance and high temperature efficiency. In addition, when electricity is used continuously or with large fluctuations, latent heat is the main heat storage, so
It has excellent constant temperature and maintains constant heat radiation.

If the heat storage material 23 is water, technical standards for pressure vessels and boilers are required. However, since the boiling point of the medium 24 used in this invention is approximately 180°C, at around 130°C it becomes a liquid at room temperature. The same management is fine.

The heat storage device of the present invention is installed in a food drying room that requires a long drying time, and uses late-night electricity, making it a cost-reducing facility.

In addition, it uses electricity that fluctuates widely, such as wave power and electric power, to store heat and use it as a heat source for the agriculture, forestry and fisheries industries.

Furthermore, late-night electricity can be stored and used for consumer heat sources such as heating, cooling, hot water supply, and savannah baths. It can be expected to have economic effects such as storing heat during low loads and dissipating heat during peak hours during the day, reducing electricity consumption under the basic contract.

This 5K realizes a constant temperature, miniaturization, and quantification that cannot be achieved with conventional sensible heat storage, and solves the problem of reduced heat transfer performance and shape instability that occur with other latent heat storage. The present invention has also been solved by a heat storage device according to an embodiment of the present invention, and a practical heat storage device utilizing latent heat can be obtained.

〔Effect of the invention〕

As explained above, the present invention has been developed by sealing a heat storage material consisting of a large number of polyethylene unit heat storage elements that absorb and release latent heat at around 130°C in a container, and also sealing a heat transfer medium in the container. At the same time, an electric resistance heating element is installed inside each unit to form a heat storage VS 1. This converts and stores heat during surplus hours, during low load times, or from energy sources that rarely fluctuate, such as sunlight or wind power, and maintains a constant temperature when used. This method has the advantage of being economical because a heat source of 130° C. with stable temperature can be obtained and the device can be downsized.

[Brief explanation of drawings]

1(a) and 1(b) show an embodiment of the present invention, FIG. 1(a) is a perspective view, and FIG. 1(b) is a perspective view of FIG. 1(a).
), Figures 2(a) and (b) are cross-sectional views taken along line I-1 of Figure 1, and Figure 2(a) is a perspective view of the heat transfer fins attached to the outer wall of the container in Figure 1. Figure 2 (bl is a cross-sectional view taken from FIG. 5 is a perspective view showing an example of a conventional hot air heater for late-night electricity use. In the figure, 21 is a heat storage device, 22 is a unit heat storage element, 23 is a heat storage material, and 24 is a medium. , 25 is a container, 26 is an electric resistance heating element, 2
7 is a terminal, and 28 is a support plate. Designated Agent: Director, Electronics Technology Research Institute, I Hirago Sato □ □, τ. Figure 1 Figure 2 Figure 3 Figure 4 ↑

Claims (1)

[Claims] A heat storage material consisting of a large number of unit heat storage elements made of polyethylene that absorbs and releases latent heat at around 130°C is sealed in the container, a heat transfer medium is sealed in the container, and an electric resistance is sealed in the container. A heat storage device characterized in that a heat storage device is configured by providing a heating element.