JPS593336Y2 - Water heater using solar heat - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a water heater that utilizes solar heat.

Conventionally, in water heaters that utilize solar heat, hot water is heated by the sun's rays during the day, and the temperature rapidly drops after sunset due to the drop in air temperature. Ta.

The purpose of this invention is to create a water heater using solar heat that can prevent the temperature of hot water from decreasing after sunset and effectively utilize hot water for a long period of time by making use of the exothermic effect during crystallization of sodium sulfate + aqueous salt, etc. It is not intended to be provided.

The present invention includes a heat storage tank 3 in which a pipe 7 is sandwiched between a plurality of heat storage containers 4 in which a heat storage body is sealed together with glass wool in a flat container body 5, and a heat collection plate 1 and a hot water storage tank 2.
This is a water heater using solar heat, characterized in that it is installed between.

Next, the present invention will be explained in detail with reference to the drawings.

Figure 5 shows a heat storage body, that is, sodium sulfate + as a heat medium.
Curve A is for aqueous salt (Granite), Curve B is for an aqueous solution of sodium hyposulfite Goki salt (Hypo), and curve is a mixed salt aqueous solution of sodium sulfate + aqueous salt and sodium Goki salt in a 7:3 ratio. Section C shows the relationship between temperature change due to heat generation and time during crystallization of each salt.

The one-dot chain line in the figure is the transition point of sodium sulfate + hydrate3
2. Shows 38°C.

As shown in curve A, when sodium sulfate + hydrate is used alone, crystallization begins after supercooling to a temperature below the transition point and heat generation occurs.

In order to appropriately control the initiation temperature of the exothermic reaction, it is preferable to use the compound in the form of a mixed salt of, for example, sodium sulfate + hydrate and sodium thiosulfate pentahydrate, as shown in curve C.

Furthermore, glass wool is an optimal nucleation material, and when a heat storage body is enclosed in a heat storage container together with glass wool, the heat storage body generates heat while smoothly crystallizing around the glass wool without causing supercooling, and generates heat locally within the container. There is no possibility that salt will precipitate and cause uneven temperature distribution in the heat storage container.

FIG. 1 shows a heat storage container 4 used as a heat storage tank in the present invention, and 5 is a flat container body in which a heat storage body and glass wool 6 are sealed together.

Since the heat storage container 4 according to the present invention has a flat shape, it is convenient to be inserted between pipes or stacked in layers.

FIG. 2 shows an example of a water heater using solar heat according to the present invention.

In the figure, 1 is a heat collecting plate, 2 is a hot water storage tank, and a heat storage tank 3 is provided apart from these.

A plurality of heat storage containers 4 are arranged in the heat storage tank 3 so as to sandwich the piping 7 therebetween.

In the example of FIG. 3, the heat storage tank 3 is provided between the heat collection plate 1 and the hot water storage tank 2, as in FIG. There is.

FIG. 4 shows the layout of the water heater shown in FIGS. 2 and 3.

Hot water heated by the heat collecting plate 1 upon irradiation with sunlight is stored in the hot water storage tank 2 via the heat storage tank 3.

During this time, the heat storage container 4 is heated via the pipe 7 in the heat storage tank 3, and the heat storage body reaches a high temperature equal to the temperature of the pipe above the passage, and is in a solution state.

For example, when the sun goes down and the heat collecting plate 1 stops operating and the hot water starts to cool down, the valve of the hot water pipe is closed, and the pipe becomes in a state where it communicates between the heat storage tank 3 and the hot water storage tank 2.

When the temperature inside the heat storage tank 3 falls below, for example, 35°C, the heat storage body in the heat storage container 4 starts to crystallize and generate heat, heating the hot water in the piping 7 whose temperature has decreased and supplying it to the hot water storage tank 2, collecting the heat. Even if the hot plate 1 stops operating, hot water can be supplied from the hot water storage tank for several hours.

The crystallized heat storage body is heated again by the circulation of hot water on the heat collection plate 1 by sunlight the next day, and when it reaches a temperature above the crystallization point, it absorbs heat while accumulating it and melting.

According to the present invention, since the heat storage tank is provided between the heat collection plate and the hot water storage tank, hot water can be supplied for several hours even when hot water cannot be heated by sunlight, and the heat storage body is connected to the container. Since it is housed within the main body, there is an effect that even if the heat storage container is damaged, the heat storage body will not be mixed into the hot water.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view of the heat storage container according to the present invention;
The figure is a conceptual perspective view of one example of a water heater using solar heat according to the present invention, Figure 3 is a conceptual perspective view of another example, Figure 4 is the layout of these water heaters, and Figure 5 is a diagram of the heat storage It is a relationship diagram between temperature and time due to heat generation. 1... Heat collection plate, 2... Hot water storage tank, 3
... Heat storage tank, 4 ... Heat storage container, 5
... Container body, 6 ... Heat storage body and glass wool, 7 ... Piping, A, B, C ...
Temperature-time relationship curve due to heat generation of a heat storage element.

Claims (1)

[Scope of utility model registration request] A heat storage tank 3 is provided between a heat collection plate 1 and a hot water storage tank 2, with a pipe 7 sandwiched between a plurality of heat storage containers 4 in which a heat storage body is sealed together with glass wool in a flat container body 5. A water heater that uses solar heat.