JP2001280654A - Ice storage bath - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate maintenance by providing a header where the connection part of piping is centered outside a heat transfer pipe. SOLUTION: Two supply headers 6a and 6b and two discharge headers 7a and 7b are arranged at four corners in a bath 1, a first heat transfer pipe 8a is directed toward a central part while it swirls clockwise with one supply header 6a as a starting point, is connected to the discharge header 7a through the area between the transfer pipes from the center. A second heat transfer pipe 8b is first directed toward a central part C with the supply header 6b as a starting point, and is connected the discharge header 7b while it swirls counterclockwise in parallel with the first heat transfer pipe 8a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ice heat storage system for converting water in a tank into ice using inexpensive nighttime electric power, and chilling or cooling food by utilizing the cold heat of the ice in the daytime. It relates to an ice thermal storage tank.

[0002]

2. Description of the Related Art One of the disadvantages of electric energy is that storage is not effective, and various attempts have been made to effectively use night power, which tends to cause a difference in supply and demand. An ice heat storage system that converts water into ice and uses the cold heat of the ice during the day to cool and cool food has been developed and attracts attention.

[0003] The ice heat storage tank used in this system is a water tank whose periphery is formed of heat insulating panels, and heat transfer tubes for freezing water are closely arranged inside.
During the night, an antifreeze liquid (brine, refrigerant) whose temperature is reduced to 0 ° C or less is circulated through this heat transfer tube by a cooler operated by low-cost nighttime electricity, and the water in the tank is changed to ice, and the piping is connected in the daytime. And the cold in the tank is supplied to the external refrigeration system through the refrigerant in the heat transfer tube to cool the food refrigeration case and the air conditioner.

[0004] The tank for the ice heat storage tank is limited by the installation location and the like.
Since the surface area is preferably small relative to the volume in order to improve the thermal efficiency, it is generally a cubic shape with one side of 1 to 2 m or a cylindrical shape. It is constructed by assembling panels. On the other hand, the heat transfer tube placed in the tank is a thin polyethylene tube with an outer diameter of about 17 mm, and the inside water is completely converted to ice.
mm. As described above, the antifreeze circulates as a refrigerant in the heat transfer tube and exchanges heat with water or ice.The antifreeze first enters the supply header provided in the vertical direction in the tank from the external piping, where it is vertically moved. The heat transfer tubes are separated at equal intervals, and the ends of the heat transfer tubes are connected again to a discharge header provided in the vertical direction and discharged. The individual heat transfer tubes run in the tank between the supply header and the discharge header in a spiral shape in a horizontal plane.However, a temperature gradient occurs at the supply end and the discharge end due to intermediate heat exchange, and the icing situation is biased. With the supply end and the discharge end reversed 2
It is common to arrange the heat transfer tubes in pairs.

An example of a conventional ice heat storage tank will be described with reference to the drawings. FIG. 4 is a conceptual view showing an ice heat storage tank in a horizontal cross section. 1 is a tank for the ice heat storage tank, 2 is an antifreeze liquid supply pipe, 3 is a connecting pipe connected thereto, 4 is an antifreeze discharge pipe, and 5 is an antifreeze discharge pipe. A connecting pipe connected thereto, 6 is a supply header, 7a and 7b are discharge headers, 8a and 8b are spiral heat transfer tubes provided between the supply headers 6a and 6b and the discharge headers 7a and 7b, and C is This is a central space surrounded by the heat transfer tubes 8a and 8b.

The supply headers 6a and 6b and the discharge headers 7a and 7b are arranged in the tank 1 in the vertical direction, and the same heat transfer tube as in FIG. One supply header 6a is located in a corner portion in the tank 1, and the other supply header 6b is located in a space C in a central portion in the tank 1. Further, one discharge header 7a is located in the space C at the center of the tank 1, and the other discharge header 7b is located at a corner different from the supply header 6a. The supply header 6b located at the center is connected to the supply pipe 2 via the communication pipe 3, and the discharge header 7a located at the center is connected to the discharge pipe 4 via the communication pipe 5.

With the above-described configuration, in FIG. 4, the first heat transfer tube 8a winds in a clockwise direction starting from the supply header 6a at the corner portion and heads toward the discharge header 7a at the center portion. For example, the antifreeze flows from the supply header 6a to the discharge header 7a while cooling the water in the tank. On the other hand, the second heat transfer tube 8b starts with the supply header 6b at the center as a starting point.
While winding counterclockwise in parallel to 8a, head toward the discharge header 7b at the corner, and during ice making, the antifreeze flows from the supply header 6b to the discharge header 7b while cooling the water in the tank. Since the heat tubes 8a and the second heat transfer tubes 8b run in parallel and flow directions are opposite to each other, the peripheral portion and the central portion are cooled without being biased to one side. In the above description, it is not necessary to fix the supply side and the discharge side as shown in this figure, and the situation is the same even if the directions are switched in the opposite directions. FIG. 4 is a conceptual diagram for the purpose of explanation only. If the horizontal cross section of the actual ice heat storage tank 1 is, for example, a square having a side length of 2 m, dozens of heat transfer tubes are provided at 40 mm intervals on one side. They line up closely.

FIG. 5 is a partial front view of a header showing the supply header 6 as an example.
Is an elbow connecting the supply pipe 2 and the supply header 6, and 81 is a pipe joint connecting the heat transfer tubes. The antifreeze is supplied into the header 6 from above via the supply pipe 2, and is distributed to the heat transfer tubes 8 in each of the upper and lower stages. The bottom of the header 6 is closed. The vertical spacing of the heat transfer tubes 8 is also approximately the same as in the horizontal direction.
A total of about 40 steps are arranged at a part up to the liquid level where water is stored at 40 mm. The structure of the discharge header 7 is the same.

In this arrangement of the heat transfer tubes, the smaller the space C in the central portion of the spiral is, the more the area to be cooled is increased, resulting in an efficient ice heat storage tank. However, since the end of each heat transfer tube is always connected to the header, the presence of the header in the space C in the narrow central portion means that the connection portion as shown in FIG. There will be many.

[0010] As described in Japanese Patent Publication No. 6-76851, the method of connecting the heat transfer tubes at the manufacturing stage is performed outside in advance, and the assembled products are collectively suspended in a tank. Is common. That is, two sets in which all the heat transfer tubes 8 are attached between the supply header 6 and the discharge header 7 at both ends on a plane are prepared, and two headers (the supply header 6b in the example of FIG. And the discharge header 7a) are bundled, and the heat transfer tube is spirally wound around the periphery thereof and suspended in the bath. If you do this,
The connection of the cooling pipe to the header in the central part can be performed without any problem before winding, but after assembling, not only the worker cannot enter the space C in the central part but also the hand. It is difficult to even see or peek, and it is almost impossible to perform maintenance such as inspection and repair of leaks at the connection after operation.

[0011]

SUMMARY OF THE INVENTION The present invention solves such a problem and arranges all the headers outside the cooling pipe without providing the header in the space of the central portion surrounded by the heat transfer tubes. It is an object of the present invention to realize an ice heat storage tank.

[0012]

According to the first aspect of the present invention, two supply headers and two discharge headers are arranged in a tank having a quadrilateral plan shape in the vertical direction, and both ends of the supply headers and the supply headers are disposed at both ends. In an ice heat storage tank in which a number of horizontal heat transfer tubes connected to a header and a discharge header are provided in the vertical direction, two supply headers are provided at the same corner in the tank, and two discharge headers are provided in the tank. At the opposite corner, two supply headers and two discharge headers are connected by connecting pipes, the connecting pipe on the supply header side is connected to the supply pipe, and the connecting pipe on the discharge header side is connected to the discharge pipe. And the first heat transfer tube, the tip of which is connected to one of the supply headers, is spirally wound in a horizontal plane, and the end of the first heat transfer tube is passed through the space between the central portion of the tank and the first heat transfer tube. To one discharge header Once the second heat transfer tube connected to the one of the supply headers is once directed to the space in the central part in the tank, the first heat transfer tube is wound in a spiral shape in the opposite direction to the first heat transfer tube in parallel with the first heat transfer tube. An ice heat storage tank characterized in that the end is connected to the other discharge header.

According to a second aspect of the present invention, one supply header and one discharge header are vertically arranged in a quadrangular tank, and both ends are connected to the supply header and the discharge header. In the ice heat storage tank having a large number of horizontal heat transfer tubes provided in the vertical direction, the supply header and the discharge header are arranged at two corners in the tank, the supply header is provided in the supply pipe, and the discharge header is provided in the supply pipe. Along with connecting to the discharge pipe, the first heat transfer tube whose tip is connected to the supply header is spirally wound in a horizontal plane, and the end of the first heat transfer tube is separated from the space of the central part in the tank to the space between the first heat transfer tube's vortex. After passing through and connected to the discharge header, the second heat transfer tube whose tip is connected to the same supply header is once directed to the space of the central part in the tank, and then parallel to the first heat transfer tube and the first heat transfer tube Wind in reverse spiral shape and end Which is the ice heat storage tank, characterized in that connected to the other of the same discharge header.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 A first embodiment of the present invention will be described with reference to FIG. Each reference numeral is the same as in FIG. 4 described above. As shown in FIG.
In this embodiment, two supply headers 6a and 6b and two discharge headers 7a and 7b are arranged at the four corners of the tank 1 so that the supply headers 6a and 6b and the discharge headers 7a and 7b are on the same side. 6a and 6b are connected by connecting pipe 3, discharge headers 7a and 7b are connected by connecting pipe 5, supply pipe 2 is connected to connecting pipe 3, and discharge pipe 4 is connected by connecting pipe 5.
Connect to

The first heat transfer tube 8a winds in a clockwise direction starting from the supply header 6a arranged at the lower left corner in FIG. 1 and heads toward the center portion. Finally, the terminal is moved from the space C in the center portion. It passes through the space between the heat transfer tubes 8 and is connected to the discharge header 7a arranged at the upper left corner. On the other hand, the second heat transfer tube 8b temporarily turns from the supply header 6b at the lower right corner to the space C of the central portion, and winds counterclockwise in parallel with the first heat transfer tube 8a starting from the space C of the central portion. While heading toward the discharge header 7b in the upper right corner.

In this manner, the two sets of four headers are all disposed outside the heat transfer tube 8, so that visual inspection is easy even after operation, and repair work is easy if the entire heat transfer tube is lifted. Can be. Embodiment 2 A second embodiment of the present invention will be described with reference to FIGS. Each reference numeral is the same as in FIG. 4 described above.

As shown in FIG. 2, in this embodiment, the supply header 6 and the discharge header 7 are one each,
The supply header 6 is connected to the supply pipe 2, and the discharge header 7 is connected to the discharge pipe 4. The first heat transfer tube 8a winds in a clockwise spiral form starting from the supply header 6 arranged at the lower right corner in FIG. 2 and heads toward the central portion. Finally, the terminal is connected to the cooling tube 8 from the space C in the central portion. And is connected to the discharge header 7 arranged at the upper left corner. A second heat transfer tube 8b, which is the other of the pair of heat transfer tubes, has a supply header 6 also in the lower right corner.
From the central portion, and from the space C of the central portion as a starting point, while being spirally wound counterclockwise in parallel with the first heat transfer tube 8a, toward the discharge header 7 at the upper right corner.

In this embodiment, the vertical rows to which the heat transfer tubes 8a and 8b from the headers 6 and 7 are connected are arranged in two rows having different directions. FIG. 3 is a partial perspective view of the header 6 showing the situation. In this way, both of the two headers are arranged outside the heat transfer tube 8, so that the visual inspection is easy even after operation, and the repair work can be easily performed by lifting the entire heat transfer tube. Furthermore, compared to the first embodiment, there is also an advantage that the two connecting pipes 3 and 5 are unnecessary and the pipes are simplified.

[0019]

According to the present invention, all the headers having a large number of pipe connection portions are arranged outside the heat transfer tubes, so that there is an excellent effect that maintenance can be easily performed.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a horizontal cross section of an ice heat storage tank according to a first embodiment of the present invention.

FIG. 2 is a conceptual diagram showing a horizontal cross section of an ice heat storage tank according to a second embodiment of the present invention.

FIG. 3 is a partial perspective view showing a header in an ice heat storage tank according to a second embodiment of the present invention.

FIG. 4 is a conceptual diagram showing a conventional ice heat storage tank in a horizontal section.

FIG. 5 is a partial front view showing a header in the ice heat storage tank of the present invention.

[Explanation of symbols]

 1 tank 2 supply pipe 3, 5 communication pipe 4 discharge pipe 6, 6a, 6b supply header 7, 7a, 7b discharge header 8, 8a, 8b heat transfer pipe 61 elbow 81 fitting C center space

Claims (2)

[Claims] 1. A supply tank (1) having a quadrilateral plan shape and two supply headers (6a, 6b) and two discharge headers (7a, 7).
b) are arranged vertically, and both ends of these supply headers (6a, 6
b) and an ice heat storage tank provided with a large number of horizontal heat transfer tubes (8a, 8b) connected to the discharge headers (7a, 7b) in the vertical direction, the two supply headers (6a, 6b) being provided in the tank (1). 2), two discharge headers (7a, 7b) are arranged at opposite corners in the tank (1), and two supply headers (6a, 6b) and 2 The discharge headers (7a, 7b) of the book are connected by connecting pipes (3, 5), respectively, the connecting pipe (3) on the supply header side is discharged to the supply pipe (2), and the connecting pipe (5) on the discharge header side is discharged. A first heat transfer tube (8a) connected to the pipe (4) and having a tip connected to one of the supply headers (6a) is spirally wound in a horizontal plane, and its end is a space (C) in the central portion of the tank. Through the first heat transfer tube (8a), connect it to one discharge header (7a), and connect the tip to the other supply header (6b) The second heat transfer tube with said (8b) is once directs the intracisternal central portion of the spatial (C) a first heat transfer tube first heat transfer tubes in parallel to (8a) (8a)
An ice heat storage tank characterized in that it is wound in a spiral shape in the opposite direction and the end is connected to the other discharge header (7b). 2. A supply header (6) and a discharge header (7) are vertically arranged in a tank having a quadrangular plan shape, and both ends of the supply header (6) and the discharge header (7) are arranged at both ends. In an ice heat storage tank provided with a large number of horizontal heat transfer tubes (8a, 8b) connected to 7) in the vertical direction, the supply header (6) and the discharge header (7) are placed at two corners in the tank. The first heat transfer tube () having a supply header (6) connected to the supply pipe (2), a discharge header (7) connected to the discharge pipe (4), and a distal end connected to the supply header (6). 8a) is spirally wound in a horizontal plane, and its end is passed through the space between the space (C) in the central portion of the tank and the space between the spirals of the first heat transfer tube (8a) and connected to the discharge header (7). The second heat transfer tube (8b) whose tip is connected to the same supply header (6) is temporarily connected to the space (C , And wound in a spiral shape in the opposite direction to the first heat transfer tube (8a) in parallel with the first heat transfer tube (8a), and the end is connected to the other same discharge header (7). An ice storage tank characterized by the following.