JPS5974493A - Heat accumulator utilizing solar heat - Google Patents

Abstract

PURPOSE:To contrive to reduce size and to simplify construction and accelerate the exchange of heat through agitating a heat-accumulating material at the time of a hot water supplying operation, by a method wherein a latent-heat heat- accumulating material is heated driectly by a heat-transmitting medium heated in a heat collector, and the vapor of the medium rising into an upper space in a heat-accumulating tank is fed to the heat collector through a compressor. CONSTITUTION:By operating a compressor 18, the heat-transmitting medium 14 heated at a heat-collector 15 by solar heat is fed into the upper space 12 in a heat-accumulating tank and into a latent-heat heat-accumulating material 13 to directly heat the latter, the vapor of the medium 14 is colected in the space 12, and is fed back into a heat-collecting pipe 15 through a discharging pipe 17. In a hot water supplying operation, the vaporized medium 14 is condensed into a liquid by a hot water supplying heat exchanger 19, the liquid sinks to a bottom part of the heat-accumulating tank 11, is evaporated by latent heat of the material 13, the vapor rises again into the upper space 12, and heats water through the heat exchanger 19 while stirring the material 13. Accordingly, operation can be performed with a high heat-exchanging efficiency, and supercooling phenomenon can be prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a solar heat storage device that stores solar heat in a latent heat storage material and utilizes it for heating hot water.

Configuration of conventional example and its problems As shown in FIG. 1, this type of conventional solar heat storage device uses a heat medium pump 2 to transfer heat medium heated by a heat collector 1 into a heat storage tank 3. transferred to the regenerative heat exchanger 4,
In addition to heating the latent heat storage material 5, the hot water supply heat exchanger 6 uses the amount of heat of the latent heat storage material 5 to heat the hot water during hot water supply operation.

In this case, since the heat medium and the heat storage material 5 in the heat storage tank 3 exchange heat through the heat storage heat exchanger 4, the heat storage performance is affected by the performance of the heat storage heat exchanger 4. In order to ensure this performance, the regenerative heat exchanger 4 needs to have a sufficient heat transfer area, which results in a problem of increased size and cost. Also, the latent heat storage material 5
Because it is difficult to flow in the heat storage tank 3, the heat exchange characteristics are poor.
Furthermore, there were other problems such as the occurrence of supercooling phenomenon.

Purpose of the Invention In view of the above-mentioned conventional problems, the present invention is aimed at ensuring the performance of a regenerative heat exchanger that exchanges heat from a heating medium to an lf"? heat storage material. The overall purpose is to solve the problem of high cost and to improve the heat exchange characteristics of the latent heat storage material.

Structure of the Invention In order to achieve the above object, the present invention includes a heat storage tank, a fit heat storage phase stored in the heat storage tank with an upper space left, and a heat storage phase that changes from a liquid to a gas when absorbing heat and when releasing heat. A heating medium that changes from a gas to a liquid and has a specific gravity higher than that of the latent heat storage material, a heating medium discharge pipe having an inlet end in the upper space of the heat storage tank and an outlet end extending outside the heat storage tank, and a solar heat medium. a heat collector for collecting all heat, a compressor installed between the heat collector and the heat medium discharge pipe, and a compressor for conveying the heat medium, and the heat collector 27.
;? r a heat medium introduction pipe that guides the vapor of the emitted heat medium to be blown into the upper space of the bitter heat tank and the latent heat storage material; This system consists of a hot water heat exchanger that completely heats the hot water using the heat stored in the heat exchanger. According to this configuration, the heat medium heated by the heat collector enters the heat storage tank through the heat medium introduction pipe and stores latent heat. The material is directly heated, and then the heat medium vapor that rises to the upper space of the heat storage tank is conveyed to the heat collector by the compressor through the heat medium discharge pipe, so the conventional heat storage heat exchanger is replaced with the heat medium introduction. It can be used in common with pipes, and as a result, it can be made smaller and simpler, and can be obtained at a lower cost.In addition, during hot water supply operation, the heating medium is vaporized by the stored heat amount, and the hot water supply heat is Heat is absorbed by the exchanger, condenses and liquefies, and then falls into the latent heat storage material, where it is vaporized again due to the amount of heat stored there and in the process of rising, the latent heat storage material is completely stirred. Therefore, operation with high heat exchange efficiency can be performed, and overcooling phenomenon can also be prevented.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In the figure, reference numeral 11 denotes a heat storage tank, and inside this heat storage tank 11, a latent heat storage material 13 is built in, leaving the entire two-part space 12 open. 14 is a heating medium, and this heating medium 14 is a latent heat storage material 13
The latent heat storage material 13 acts as a heat exchange promoting material, changes from liquid to gas when absorbing heat, and changes from gas to liquid when releasing heat, and has a higher specific gravity than the latent heat storage material 13. 1
Reference numeral 5 denotes a heat collector that collects all of the solar heat, and reference numeral 16 indicates a heat medium introduction pipe that guides the heat medium heated by the heat collector 15 so as to be blown into the upper space 12 of the heat storage tank 11 and the latent heat storage material 13. Reference numeral 17 denotes a heat medium discharge pipe whose inlet end is fully staged in the upper space 12 of the heat storage tank 11 and whose outlet end is outside the heat storage tank 11. The outlet end of the heat medium discharge pipe 17 and the heat collector 15 A compressor 18 for conveying a heat medium is provided between the two. Reference numeral 19 denotes a hot water heat exchanger installed in the upper space 12 of the heat storage tank 11, and this hot water heat exchanger 19 completely heats the hot water.

In the above configuration, the entire operation during heat storage operation will be explained. First, when the compressor 18 is operated, the heat medium 14 is conveyed to the heat collector 15 and heated by solar heat. The heat medium 14 heated by the heat collector 15 is blown into the upper space 12 of the heat storage tank 11 and the latent heat storage material 13 through the heat medium introduction pipe 16, and directly heats the latent heat storage material 13. and heating medium 14
The steam collects in the upper space 12 of the heat storage tank 11, passes through the entire heat medium discharge pipe 17, exits the heat storage tank 11, and returns to the heat collector 1.
5.

Next, to explain the operation during hot water supply operation, the hot water supply water is heat exchanged and heated by the hot water supply heat exchanger 19. When this hot water supply operation is performed, the heating medium 1 is vaporized by the stored heat amount
4 absorbs heat by the hot water supply heat exchanger 19 and is condensed and liquefied, and has a higher specific gravity than the latent heat storage material 13, so the heat storage tank 11
sinking to the bottom of the In this case, since the latent heat storage material 13 releases all of its latent heat one after another, the heat medium 14 is vaporized and rises again to the upper space 12 of the heat storage tank 11, and is transferred to the hot water heat exchanger 19 while stirring the latent heat storage material 13. give heat. By repeating these operations, the hot water is heated.

Thus, in one embodiment of the present invention, the heat collector 15
The heating medium 1 is heated by the solar heat, which is heated by the solar heat.
4 directly heats the latent heat storage material 13 as the total input heat amount, which is the majority of the collected heat amount, so it can be used in common with the conventional heat storage heat exchanger total heat medium introduction pipe 16, and as a result, it is made smaller and simpler. However, C1 is also lower in cost. When hot water supply operation is performed as ilt heat output,
Since the heating medium 14 acts to stir the latent heat storage material 13,
Thereby, heat exchange of the latent heat storage material 13 can be promoted, and therefore, the entire operation can be carried out with high heat exchange efficiency, and supercooling phenomenon can also be prevented.

Effects of the Invention As described above, according to the present invention, the heat medium heated by the heat collector enters the heat storage tank through the heat medium introduction pipe, directly heats the latent heat storage material, and then fills the upper space of the heat storage tank. Since the heat medium vapor that rises to the heat medium discharge pipe is conveyed to the heat collector by the compressor, the conventional thermal storage heat exchanger can also be used as the heat medium introduction pipe. It is simplified and can be obtained at a low cost, and during hot water supply operation, the heat medium is vaporized by the amount of heat stored, heat is absorbed by the hot water heat exchanger, and the condensate is released, and the latent heat is stored. The latent heat storage material is agitated in the process of falling into the material, where it is vaporized again by the amount of stored heat, and rising. This can fully promote heat exchange of the latent heat storage material, and therefore, operation with high heat exchange efficiency can be achieved. It is possible to prevent overcooling as well as to prevent overcooling.

[Brief explanation of the drawing]

FIG. 1 is a system configuration diagram of a solar heat storage device that shows a conventional example, and FIG. 2 is a system configuration diagram of a solar heat storage device that shows an embodiment of the present invention. 11... Heat storage tank, 12... Upper space, 13
・Old... Latent heat storage material, 14... Heat medium, 15...
... Heat collector, 16 ... Heat medium introduction pipe, 17 ...
...heat medium discharge pipe, 18゛°°゛°°compressor, 19.
...Hot water heat exchanger. Name of agent: Patent attorney Toshio Nakao
1 map prefecture 2 ward

Claims (1)

[Claims] A heat storage tank, a latent heat storage material stored with an upper space left in the heat storage tank, and a heat medium that changes from a liquid to a gas when absorbing heat, and from gas to a liquid when releasing heat, and which is exposed outside. an extraction pipe, a heat collector that collects solar heat, a compressor that is installed between the heat collector and the heat medium discharge pipe and that transports the heat medium, and the heat heated by the heat collector. A heat medium introduction pipe that guides a medium to be blown into the upper space in the heat storage tank and into the latent heat storage material, and a heat medium introduction pipe that is installed in the upper space in the heat storage tank and heats hot water by the amount of heat stored in the latent heat storage material. A solar heat storage device consisting of a hot water heat exchanger and a hot water heat exchanger.