JPS58221388A - Latent heat type heat accumulating device - Google Patents

Abstract

PURPOSE:To maintain the high outlet temperature of a heat exchanging medium upon radiating heat by a method wherein a plurality of radiators, in which the heat exchanging medium is passing through, are provided to switch the radiators in the heat accumulating device utilizing a latent heat type heat accumulating agent. CONSTITUTION:The heat accumulating agent 2 and a plurality of radiators 3 are accommodated in a heat accumulating tank 1. Upon finishing heat accumulation, the heat accumulating tank 1 is filled with the molten liquid 2a of the heat accumulating agent. Heat emission is initiated by low-temperature heat exchanging medium 5, flowing into one of the radiators 3a in the heat accumulating tank 1 through a branching device 4, and the solid phase 2b of the heat accumulating agent is separated out and adhered to the tube wall of the radiator 3a gradually thereby reducing the heat transmitting property of the radiator. When the temperature of the heat exchanging medium is decreased to a given value, the branching device 4 switches the radiator 3a to another radiator 3b. By switching the radiators 3 one by one, the heat exchanging medium 5, having a temperature higher than a given value, may be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a latent heat type heat storage device that stores thermal energy using solar heat, late-night electricity, etc. and is used for hot water supply, space heating, etc.

In recent years, research has been actively conducted on the effective use of energy such as unstable solar heat and late-night electricity, and on the use of latent heat storage materials such as inorganic and organic water salts from the viewpoint of high-density storage.

An example of a conventional heat storage device is shown in FIG. The heat storage tank container 1 is filled with a heat storage material 2, and heat is radiated by passing a low-temperature heat exchange medium through the radiator 3 and removing latent heat of fusion from the heat storage material melt 2-A. Then, the heat storage material melt 2a begins to crystallize, and as a result, the heat storage material solid phase 2b adheres to the tube wall of the radiator 3. Here, the problem is the low thermal conductivity of the heat storage material solid phase 2b, and as the heat storage material solid phase 2b grows, the heat exchange efficiency rapidly decreases. In other words, in the molten state, the temperature in the heat storage material is almost uniform due to convection, but once it begins to solidify, the temperature of the heat storage material near the radiator drops rapidly because the thermal conductivity of the solid is low. This is because the rate at which heat is transferred from the heat transfer surface of the radiator is faster than the rate at which heat is transferred from the heat storage material in the portion away from the heat transfer surface. In this way, the heat stored in the heat storage material cannot be extracted effectively and efficiently.

The present invention aims to improve the heat dissipation characteristics of the latent heat type heat storage device, which has the above-mentioned conventional problem, and to effectively and efficiently extract the heat stored in the heat storage material.

In order to achieve the above object, the present invention provides a heat storage device using a latent heat type heat storage material with a plurality of heat radiators through which a heat exchange medium passes, and uses each of the heat radiators appropriately.

By this measure, a high outlet heat exchange medium temperature can be maintained during heat dissipation.

An embodiment of the heat storage device according to the present invention will be described below with reference to FIG. Note that the same parts as in FIG. 1 are given the same numbers. The inside of the heat storage tank 1 consists of a heat storage material 2 and a plurality of radiators 3 (heaters are omitted). At the time of heat storage light r, the inside of the heat storage tank 1 is filled with the heat storage material melt 2a, and the low temperature heat exchange medium 5 flows into one heat radiator 3a in the heat storage tank 1 through the one branch device 4. This will start dissipating heat.

Each radiator is designed to obtain a predetermined outlet heat exchange medium temperature, but as the heat storage material solid phase 2b gradually precipitates and adheres to the tube wall of the radiator 3a, the heat transfer performance deteriorates. . When the temperature drops to a certain level, the branching device 4 switches to another radiator 3b. By switching the heat radiators 3 one after another, it is possible to obtain a heat exchange medium 6 having a temperature higher than a certain temperature. This process is shown in FIG. 3 in terms of the relationship between outlet heat exchange medium temperature and time (or flow rate). On the other hand, in the heat radiator (for example, 3a) where the inflow of the heat exchange medium 6 has stopped, the heat radiation is zero, and the heat propagation from the heat storage material melt is superior, so that a part of the heat storage material solid phase 2b melts and recovers the heat transfer performance. .

As described above, according to the heat storage device according to the present invention, the heat stored in the heat storage material can be effectively and efficiently used.

A stable outlet heat exchange medium temperature can be obtained.In addition, in the above example, each radiator was used alone,
Needless to say, they may be used together.

Alternatively, a single heat radiator may be used to detect the outlet temperature and allow the heat exchange medium to flow intermittently.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional heat storage device, and FIG. 2 is a sectional view of a latent heat type heat storage device according to an embodiment of the present invention. FIG. 3 is a characteristic diagram showing the relation device 1 for one hour (flow rate) of the outlet heat exchange medium. 1... Heat storage tank, 2... Heat storage material, 3...
・・・・Radiator. 4... Branch device, 6... Heat exchange medium. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

[Claims] A heat storage material is disposed within the heat storage layer, a plurality of radiators through which a heat exchange medium passes are provided in the heat storage material, and a branch for selecting a flow path for the heat exchange medium is provided on the inlet side of the plurality of radiators. A latent heat type heat storage device equipped with means.