JPH06159963A - Heat accumulator - Google Patents

Abstract

PURPOSE:To make a latent heat accumulating material accumulate heat efficiently by an unexpensive system in which only a small amount of power is required for stirring latent heat accumulating mateiral in a heat accumulator which accumulates heat or transfers heat by using the latent heat accumulating material which utilizes latent heat generated by phase changes. CONSTITUTION:In the title heat accumulator, a hollow cylinder 2 is provided inside, a heat exchanger 3 is arranged inside the hollow cylinder 2, a bubble diffuser 4 is provided at a lower part of the hollow cylinder 2, and a pipe 6 with an air pump 5 is connected to the diffuser 4. As a heat accumulating medium 7 to be poured into the heat accumulator 1, an emulsion is used in which a dispersed phase comprising paraffin having a higher melting point than a continuous phase, oil and fat, olefin or the like is dispersed in the continuous phase comprising ethylene glycol solution, propylene glycol solution, water itself or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat storage tank of a system for storing or carrying heat by using a latent heat storage material which utilizes latent heat generated by a phase change.

[0002]

2. Description of the Related Art As a conventional heat storage device, there is a heat storage device that uses a dynamic ice making system for producing ice in the form of slurry as a heat storage medium. This method requires a dispersion part having a very complicated structure, and ice in the form of slurry produced by this method is likely to agglomerate and cannot be generally transported. FIG. 2 shows a conventional heat storage device. As shown in FIG. 2, in this heat storage device, water, which is the heat storage medium 15 contained in the heat storage tank 8, is made into ice in the form of slurry by the above method using the super chiller 9, and the heat storage medium 15 is pumped by the pump 16. The heat is sent to the radiator 13 through the pipe 12 and returned to the heat storage tank 8 after the heat is released.

In addition, there is also known a heat storage device utilizing latent heat due to a phase change between an emulsion and a suspension as a heat storage medium, which has a heat exchanger for supplying heat to a heat storage tank, The heat was stored in this heat storage medium while stirring with a stirrer.

[0004]

In the conventional heat storage system, the system of the heat storage tank has a complicated structure, resulting in a very expensive system. In addition, in a heat storage device that uses an emulsion as a heat storage medium, the heat storage medium can be conveyed. However, when a heat exchanger is provided in the heat storage tank to store heat, the emulsion (sometimes in a suspension state) can be compared to water. It was highly viscous and it was difficult to store heat while stirring so as not to generate a temperature gradient.

Therefore, the present invention is an inexpensive system,
An object of the present invention is to provide a heat storage device capable of efficiently storing heat in a latent heat storage material, with low power required for stirring.

[0006]

According to the present invention, in order to solve the above-mentioned problems, a hollow cylinder 2 is provided inside a heat storage tank 1, a heat exchanger 3 is arranged inside the hollow cylinder 2, and the hollow cylinder 2 is provided. A bubble outlet 4 is provided in the lower portion, a pipe 6 having an air circulation pump 5 is connected to the outlet 4, and a carrier medium 7 to be injected into the heat storage tank 1 is an ethylene glycol aqueous solution, a propylene glycol aqueous solution, or a simple solution. A heat storage tank characterized by using an emulsion in which a dispersed phase composed of paraffin, oil or fat, olefin, or the like having a higher melting point (same freezing point) than the continuous phase is dispersed in a continuous phase composed of water or the like.

[0007]

[Operation] According to the present invention, with the above configuration, the heat storage medium around the heat exchanger inside the cylinder is made to flow, and further, the apparent density difference between the heat storage medium outside the cylinder and the heated heat storage medium inside the cylinder. The air-lifting effect is used to promote the flow of the heat storage medium in the tank, promote its stirring, and improve the heat exchange performance.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The operating conditions of a heat storage system using the heat storage tank of the present invention will be described below with reference to an embodiment shown in FIG.

As the heat storage medium 7, a continuous phase consisting of an aqueous solution of ethylene glycol, an aqueous solution of propylene or water,
An emulsion in which a dispersed phase composed of paraffin, oil or fat or olefin having a higher melting point (same as the freezing point) than the continuous tank is dispersed is used.

In the heat exchanger 3 incorporated in the hollow cylinder 2 in the heat storage tank 1, bubbles are generated from the lower part of the cylinder to generate heat.
An air pump 5 that promotes the flow of the surrounding heat storage medium is arranged in a pipe 6 that connects the upper part inside the tank and the seat part inside the tank. Inside the heat exchanger 3, there is a group of pipes through which the refrigerant flows, and the heat storage medium 7 rises on the outer wall of the pipes. At that time, heat exchange is promoted by the heat storage medium 7 and the heat exchanger 3, and heat is stored. At the same time, an apparent density difference occurs in the heat storage medium 7 inside and outside the partition wall of the hollow cylinder 2, the heat storage medium 7 rises from the inside of the hollow cylinder 2, and the heat storage medium descends outside the hollow cylinder 2 to cause a large-scale flow in the heat storage tank 1. Is promoted and stirring of the entire tank is promoted.

In this way, the heat storage medium 7, which is an emulsion, efficiently absorbs cold heat while changing into a suspension.

[0012]

As described above, according to the present invention, the flow of the heat storage medium is promoted and the stirring of the heat storage medium is promoted to improve the heat exchange performance at a lower cost and lower power as compared with the prior art.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of a heat storage tank of the present invention.

FIG. 2 is a schematic diagram showing a conventional heat storage system.

[Explanation of symbols]

 1 Heat Storage Tank 2 Hollow Cylinder 3 Heat Exchanger 4 Outlet 5 Air Pump 6 Piping 7 Heat Storage Medium 9 Super Chiller 10 Circulation Pump 11 Piping 12 Piping 13 Radiator 14 Blower 15 Heat Storage Medium 16 Transport Pump

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeru Dono 1048, Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works Co., Ltd. (72) Toshiki Tamura, 1048, Kadoma, Kadoma City, Osaka Matsushita Electric Works Co., Ltd.

Claims (1)

[Claims] 1. A hollow cylinder 2 is provided inside, a heat exchanger 3 is arranged inside the hollow cylinder 2, a bubble outlet 4 is provided at the lower part of the hollow cylinder 2, and an air pump 5 is provided at the outlet 4. As the heat storage medium 7 which is connected to the arranged pipe 6 and is injected into the heat storage tank 1, a continuous phase composed of an aqueous solution of ethylene glycol, an aqueous solution of propylene glycol, mere water or the like has a higher melting point (same as the freezing point) than that of the continuous tank. A heat storage tank characterized by using an emulsion in which a dispersed phase composed of paraffin, oil or fat, olefin or the like is dispersed.