JPH0378557B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heat storage tank for storing heat medium water for heating and cooling buildings, industrial facilities, etc.

[Problem that the invention seeks to solve]

As one type of heat storage tank, a temperature stratification type is widely used because of its high heat storage efficiency. This type of heat storage tank is used, for example, in the winter (see figure a), as shown in Figure 6.
In the tank 1, high-temperature water 3 heated by a heating device serving as a primary heat exchanger 2 is stored, and this water 3 is supplied to an air conditioner serving as a secondary heat exchanger 4 for air conditioning.
In this case, high-temperature water from the primary heat exchanger 2 flows into the upper layer of the tank and low-temperature water from the secondary heat exchanger 4 flows into the lower layer to form temperature stratification. ~70℃) is supplied to the secondary heat exchanger, and the lower low temperature water (approximately 30~40℃) is supplied to the primary heat exchanger. Also, in the summer (see Figure 6b), 1
Low-temperature water 3 cooled by a cooling device that becomes the next heat exchanger 2 is stored in the tank 1, and is transferred to the secondary heat exchanger 4.
The air is supplied to an air conditioner for air conditioning. In this case, the low-temperature water from the primary heat exchanger 2 flows into the lower layer, and the high-temperature water from the secondary heat exchanger 4 flows into the upper layer, and the high-temperature water (approximately 10 to 15 degrees Celsius) from the upper layer is caused to flow into the upper layer. , forming temperature stratification between the lower layer low temperature water (approximately 0 to 7°C), and supplying the lower layer low temperature water to the secondary heat exchanger 4 and the upper layer high temperature water to the primary side heat exchanger 2. . In addition, in the drawing, 5 is a pump.

For this reason, conventional temperature-stratified heat storage tanks either require separate inlets for summer and winter, or require a bypass when sharing an inlet, resulting in a complicated piping system. There was a drawback.

That is, when the inlet and outlet are shared, for example, as shown in FIG. A secondary heat exchanger 4 is provided in the passage 7, and 1
Next, switching valves 8 and 8 are installed near both ends of the secondary pipes 6 and 7, respectively, and a switching valve 9 is installed between the pipes 6 and 6 and between 7 and 7 before and after the switching valves 8 and 8.
The two bypass pipes 10 and 10 are connected to each other. By arranging the piping in this way, the switching valves 9, 9 of the bypass pipe 10 on the primary side can be used in winter.
and close the switching valves 8, 8 of the secondary pipe line 7.
High-temperature water from the next-side heat exchanger flows into the upper layer through the primary pipe line 6, and this high-temperature water from the upper layer is supplied to the secondary-side heat exchanger 4 through the secondary side bypass line 10. , low temperature water 3 is allowed to flow into the lower layer. On the contrary, in summer, the switching valves 8, 8 of the primary side pipe line 6
is closed, and the switching valves 9, 9 of the bypass pipeline 10 on the secondary side are closed for operation.

This invention does not complicate the piping system associated with the conventional temperature stratification type heat storage tank as described above.
The object of the present invention is to propose a heat storage tank that can be operated while forming a predetermined temperature stratification while maintaining one direction of water flow.

[Means for solving problems]

The present invention will be explained below with reference to illustrated embodiments of a heat storage tank.

In FIGS. 1a and 1b, the heat storage tank 1 is equipped with two vertical headers 13 and 14 having openings 11 and 12 in the upper and lower parts. One header 13 is the outflow pipe 1 to the primary heat exchanger.
5, and an inflow pipe 16 from the secondary heat exchanger are connected, and the other header 14 is connected to an inflow pipe 17 from the primary heat exchanger and an outflow pipe to the secondary heat exchanger. 18 are connected. Further, an upper cover 19 and a lower cover 20 are attached to the upper and lower openings 11 and 12 of the respective headers 13 and 14, and one of them can be selectively opened.

Figure 2 shows header 1 with the actual inflow and outflow pipes installed.
3, and disk-shaped upper and lower lids 19 and 20 are attached to the upper and lower ends of the header 13 and connected by a shaft 21 inserted along the center of the header 13. Also, header 13
As shown in FIGS. 3 and 4, flanges 22 with the same outer diameter as the lid and provided with a loose hole 24 protrude from the upper and lower ends of the lid, and guide rods 23 protrude from the periphery of the lids 19 and 20. The upper and lower lids 19 and 20, which are connected by a shaft 21 as shown in FIGS. 2 and 4, move up and down using a guide rod 23 inserted through a loose hole 24 as a guide. A nut 25 is screwed into the guide groove 23 of the upper lid 19 at a predetermined position, and the loose hole 24 consists of a large diameter part through which the nut 25 passes and a small diameter part through which the nut does not pass, so that the mandrel 21 can be pulled upward. The nut 25 is locked at the small diameter portion by slightly rotating the upper cover 19, and the upper cover 19 is fixed at a predetermined height.
An opening 11 can be formed between the flange 22 at the upper end of 3 and the upper lid 19. Conversely, when the nut 25 is released from the small diameter part of the loose hole and lowered, the opening 11 at the upper end is closed and the flange 22 and the lower cover 2 are opened at the lower end.
An opening 12 can be formed between the opening 12 and 0. Therefore, according to this method, the headers 13, 14
Either one of the openings at the top and bottom ends can be selectively opened and the other can be closed. In addition, in Figure 2, 2
6 is Patsuking.

Since the opening of this header must be submerged in water, the dimension L ₁ between the upper and lower lids 19 and 20 is smaller than the water level of the heat storage tank, and the vertical dimension of the openings 11 and 12 is set to the secondary side. It is uniquely set based on the supply flow rate, usage temperature difference, degree of thermal mixing in the tank, etc. The mandrel 21 can be raised and lowered manually or mechanically. The means for opening and closing the openings at the upper and lower ends of the header is not limited to the method described in the above embodiment. In addition, if the heat storage tank has an air tank, the fifth
As shown in the figure, an air vent pipe 27 may be attached to the upper lid 19 to communicate the inside of the header 13 and the air layer 28 to allow air to be vented.

[Effect]

Figure 1a is during winter operation, and header 1
The lower end opening 12 of the header 3 is opened, and the upper end opening 11 of the header 14 is opened. The high-temperature water heated by the primary heat exchanger passes through the inflow pipe 17 to the header 1.
4 flows into the upper part of the tank 1 from the upper end opening 11,
The high temperature water in the upper layer is supplied to the secondary heat exchanger through the opening 11, the header 14, and the outflow pipe 18.
Low-temperature water from the secondary heat exchanger flows into the lower layer through the inflow pipe 16, header 13, and opening 12,
The low-temperature water in the lower layer is sent to the primary heat exchanger through the opening 12, header 13, and outflow pipe 15.

When driving in summer, as shown in figure b, header 1
3 is opened, and the lower end opening 12 of the header 14 is opened. The low-temperature water from the primary heat exchanger flows through the inlet pipe 17, header 14, and opening 12.
The low-temperature water in the lower layer is supplied to the secondary heat exchanger through the opening 12, the header 14, and the outlet pipe 18. High-temperature water from the secondary heat exchanger flows through the inflow pipe 16, header 13, and opening 1.
The high temperature water in the upper layer flows through the opening 11, the header 13, and the outflow pipe 15 to the primary heat exchanger.

〔Effect of the invention〕

This invention consists of the above configuration. The piping attached to this heat storage tank is only two headers and an outflow pipe and an inflow pipe that flow in a fixed direction, which are connected to each other, and the lids at the top and bottom ends of the headers can be opened and closed for operation during winter and seasonal operation. I can handle it. Therefore, piping and operation are simple. In addition, low-temperature water flows into the lower layer and high-temperature water flows into the upper layer to achieve temperature stratification, and high heat storage efficiency can be achieved.

[Brief explanation of drawings]

1A and 1B are longitudinal cross-sectional views schematically showing the heat storage tank of the example, in which a shows the operating state in winter and b shows the operating state in summer, FIG. 2 is a longitudinal cross-sectional view of the header, and FIG. Plan view of flange with loose holes, No. 4
The figure is a perspective view of the upper lid part at the upper end of the header, Figure 5 is a vertical sectional view of the upper end of the header with an air vent pipe attached, and Figures 6 a and b are schematic diagrams showing the operating conditions of a conventional heat storage tank in winter and summer. FIG. 7 is a schematic longitudinal sectional view of a conventional heat storage tank that shares an inlet and outflow pipe. 1... Heat storage tank, 2... Primary side heat exchanger, 3...
Water, 4... Secondary heat exchanger, 5... Pump, 6...
...Primary pipe line, 7...Secondary pipe line, 8...Switching valve, 9...Switching valve, 10...Bypass pipe line,
11, 12...Opening, 13, 14...Header, 15...Primary side outflow pipe, 16...Secondary side inflow pipe, 17...Primary side inflow pipe, 18...Secondary side outflow pipe , 19... Upper cover, 20... Lower cover, 21... Mandrel, 22... Flange, 23... Guide rod, 24
... Loose hole, 25 ... Nut, 26 ... Packing, 27 ... Air vent pipe, 28 ... Air layer.

Claims (1)

[Claims] 1. A temperature-stratified heat storage tank using water for heating and cooling as a heat medium, which is equipped with two headers having openings in the upper and lower parts of the tank, and one header is connected to an inflow pipe from a primary heat exchanger. and the outflow pipe to the secondary heat exchanger are connected, and the other header is connected to the outflow pipe to the primary heat exchanger and the inflow pipe from the secondary heat exchanger. A heat storage tank characterized by having means for selecting and opening one of two openings.