JPS6345648Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a heat storage device including a heat storage tank in which a liquid heat storage body for storing solar heat is stored.

Conventionally, there is a heat storage device of this type configured as shown in FIG. 1, for example.

In this system, solar heat collected by a solar collector 1 is stored in water as a liquid heat storage medium stored in a heat storage tank 2, and the heat from a heat pump 4 used for heating or hot water supply is stored in the heat storage tank 2. An exchanger 3 is installed.

Note that 5 is a circulation pump and 6 is a circulation pipe.

However, in such a heat storage device, there is a limit to the amount of heat that can be stored in the heat storage tank 2 by the solar collector 1.

Therefore, in the conventional device, when the heat pump 4 performs heating or hot water supply operation, the water temperature in the heat storage tank 2 decreases to 50°C.
Since the heat exchange efficiency fluctuates widely from .degree. C. to about 5.degree. C., when heating is performed for a relatively long period of time, the fluctuation in heat exchange efficiency is large, resulting in a problem of high running costs.

The present invention solves the above-mentioned conventional problems by providing a configuration in which the water temperature around the heat exchanger in the heat storage tank can be adjusted according to the load.

Therefore, the present invention provides a heat storage device in which a liquid heat storage body that absorbs solar heat is stored in a heat storage tank, and the heat storage tank includes an inlet facing the upper layer of the heat storage body and an outlet facing the lower layer. To provide a heat storage device, which is provided with a passageway, a heat exchange part for extracting heat to the outside is interposed in the passageway, and a flow rate control valve is provided for changing the opening area of the passageway to adjust the amount of liquid heat storage material flowing in the passageway. .

Embodiments of the present invention will be described below with reference to FIGS. 2 and 3. Note that the same elements as in the conventional example are given the same reference numerals to simplify the explanation.

In FIG. 2, a cylindrical rectifying plate 7 forming a passage in the heat storage tank 2 has an upper end serving as an inlet 8 opening into the upper layer of water in the heat storage tank 2, and a lower end opening into the lower layer. The outlet 9 is disposed within the heat storage tank 2 .

On the other hand, a heat exchanger 3 serving as a heat exchange unit for extracting the heat of the stored water to the outside is disposed in a passage partitioned by the rectifying plate 7, and is, for example, a heat pump 4.
It is used as an evaporation side heat exchanger.

Further, a flow rate control valve 10 is provided at the outlet 9 at the lower part of the passageway to adjust the amount of water circulating in the passageway by changing the opening area of the passageway. This valve 10 has a valve body 10A depending on the temperature of the passage inside the rectifier plate 7.
The opening degree of the opening is adjusted. That is, as shown in FIG. 3, the control device 12 controls the operation of the valve body driving motor 13 based on the water temperature signal emitted from the temperature sensor 11 disposed above the valve body 10A in the passage. Specifically, the valve body 10A is configured to be fully open at a predetermined low temperature, and gradually close as the temperature rises. Note that the valve body 10A may be operated arbitrarily regardless of the signal from the temperature sensor 11.

Now, in order to use the heat of the water in the heat storage tank 2 for the heat pump 4, heat is exchanged via the heat exchanger 3.
The hot water in the baffle plate 7 near the heat exchanger 3 is deprived of heat and flows down the baffle plate 7, and at the same time, warm water from the upper layer flows into the baffle plate 7 from the inlet 8, and the heat storage tank A convection current guided by the rectifier plate 7 occurs throughout the inside of the rectifier 2 .

Therefore, the highest temperature water in the heat storage tank 2 is guided to the vicinity of the heat exchanger 3 arranged in the passage partitioned by the rectifying plate 7, and the water in the uppermost layer after heat exchange is cooled. Since the water flows out to the lowest layer in the heat storage tank 2 through the outlet 9, cold water is stored in the lower layer without mixing with water in other intermediate layers outside the passage. By adjusting the amount of water circulating in the passage with the flow control valve 10, the temperature of the water in the passage is controlled to be kept approximately constant regardless of the water temperature inside the heat storage tank 2 outside the passage. By setting the heat exchange water temperature to the relatively most efficient heat exchange water temperature from the beginning of operation, it becomes possible to operate evenly according to the load, and it is possible to reduce running costs. Furthermore, the heat exchange water temperature can be arbitrarily set depending on the remaining heat amount, heat pump performance, weather conditions, operating conditions, etc. in addition to the water temperature.

In addition, if the heat exchanger on the condensing side of the heat pump is placed in the passage and used as a hot water storage tank instead of a heat storage tank by taking in external heat, the flow rate can be reduced by restricting the flow rate with the flow rate adjustment valve. It can make a small amount of high temperature water in an hour.

As explained above, according to the present invention, a rectifier plate is disposed inside the heat storage tank, and a flow rate control valve for the in-tank heat transfer fluid flowing through the rectifier plate is provided. This effectively prevents the mixing of liquid heat storage bodies, allows the always high temperature heat storage body to be used for heat exchange, improves heat exchange efficiency, allows the heat pump to operate efficiently, and allows the heat storage tank to be cleaned from the beginning of operation. This has a great practical effect of setting the heat exchange fluid temperature to the relatively most efficient temperature, making it possible to operate evenly depending on the load, and reducing running costs.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of a conventional heat storage device,
FIG. 2 is a schematic diagram showing an embodiment of the heat storage device according to the present invention, and FIG. 3 is an enlarged sectional view of a flow rate regulating valve portion of the same device. 1... Solar collector, 2... Heat storage tank, 3...
...heat exchanger, 7... rectifying plate, 8... inlet, 9...
...Outlet, 10...Flow control valve.

Claims (1)

[Scope of utility model registration request] In a heat storage device in which a liquid heat storage body that absorbs solar heat is stored in a heat storage tank, an inlet facing an upper layer of the heat storage body and an outlet facing a lower layer of the heat storage body in the heat storage tank,
A heat exchanger for extracting heat to the outside is provided in the passage, and a flow rate regulating valve is provided for changing the opening area of the passage to adjust the amount of liquid heat storage material flowing through the passage. A heat storage device.