JPH1144440A - Water heat storage tank and water heat storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit the contriving of cost down as well as the formation of a sufficient temperature stratification and realize a high heat storage efficiency by a method wherein the tank main body of a sealed and pressure resistant structure is formed by connecting lids, made of a steal sheet, to the upper end as well as the lower end of a continuous spiral steel pipe while a distributor and a high-temperature side water flow passing pipe are incorporated into the tank main body. SOLUTION: A water heat storage tank 21, employed for the air conditioning and the like of a large-scale factory and the like, capable of being installed at an outdoor vacant land, is provided with a tank main body 20 of a sealed and pressure resistant structure, in which lids 16, 18, made by a steel sheet, are attached to the upper and lower ends of a continuous and large diametral spiral steel pipe. In this case, an upper distributor 22 and a lower distributor 24 are provided at upper and lower parts in the tank main body to constitute a temperature stratification at the upper and lower parts in the tank main body 20 and keep a high heat storage efficiency while the distributors 22, 24 are formed by providing a plurality of sets of openings 26 on both left and right sides of a horizontal tube in the lengthwise direction of the same. On the other hand, low-temperature side water inlet and outlet port nozzles 28 are connected to the lower distributor 24 and a high-temperature side water flow passing pipe 30, drooping along the inner wall of the tank main body 20, is connected to the upper distributor 22 while high-temperature side water inlet and outlet port 32 is connected to the lower end of the high-temperature side water flow passing pipe 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heat storage tank for storing and supplying cold water used for air conditioning of a large-scale factory or the like, and a water heat storage device using a plurality of the water heat storage tanks in combination. The present invention relates to a water storage tank and a water storage device capable of producing high-temperature storage efficiency at a low cost for producing cold water at night using inexpensive nighttime power and storing the cold water for use in a daytime cooling load. It is.

[0002]

2. Description of the Related Art FIG. 6 shows an existing cooling system without a water heat storage tank. Refrigerators 10a, 10b, 10c
For example, chilled water cooled to about 7 ° C. is supplied to a cooling load side of the air conditioner 12 and the like, and water used for cooling is cooled to about 12 ° C., for example, by the chillers 10a and 10b by the chilled water pumps 14a and 14b. And returned to 10c for cyclic use.
In the existing cooling system as shown in FIG. 6, the power consumption during the day cannot be suppressed.

[0003] Japanese Patent Publication No. 27452/1992 discloses a waterproofed water heat storage tank which is formed by using an underground buried portion of a building frame for air conditioning equipment in a concrete building. As described above, the conventional water heat storage tank is often constructed by using the space in the underground double slab such as a building. However, in this method, a water heat storage tank cannot be added later, and pressure cannot be applied, so that the method cannot be applied to a closed system.

For installation on the ground, a panel water tank made of FRP, stainless steel plate, or the like may be used. However, since it is not a pressure-resistant structure, the water depth cannot be increased so much that the heat storage efficiency is poor. There is a disadvantage that the construction cost is high. These panel aquariums also cannot be applied to closed systems because they cannot apply pressure.

[0005]

SUMMARY OF THE INVENTION It has been a long time since the promotion of the introduction of a heat storage system has been called out as a measure to level the power load.
Due to the above factors, it is not widely used for industrial purposes. The present invention has been made in view of the above-mentioned points, and an object of the present invention is to adopt a low-cost large-diameter spiral steel pipe of a commercially available standard product as a material for a tank body, and to merely attach a lid on top and bottom. In order to reduce the piping work on site, it has a simple structure and the high temperature side water distribution pipe is built in the inside in advance, thereby realizing cost reduction and adopting a long pipe to deepen the water depth. Accordingly, it is an object of the present invention to provide a water heat storage tank and a water heat storage device capable of forming a sufficient temperature stratification (a vertical temperature gradient layer) and achieving high heat storage efficiency. Further, an object of the present invention is to provide a structure that can be installed in an open space outdoors, for peak shift with respect to existing non-heat storage equipment,
An object of the present invention is to provide a water heat storage tank and a water heat storage device that can be applied when introducing a water heat storage system for peak cutting.

[0006]

In order to achieve the above object, a water heat storage tank according to the present invention comprises a long spiral steel pipe having a steel plate lid joined to an upper end and a lower end thereof to form a closed pressure-resistant tank body. It is formed by incorporating a distributor and a high-temperature-side water flow pipe inside the tank body. In the above water storage tank, the distributor is composed of an upper distributor and a lower distributor, and the lower distributor is connected so that the low-temperature side water inlet / outlet nozzle is located at the lower part of the tank, and the upper distributor is connected to the high-temperature side water. A flow pipe is connected, a high-temperature water inlet / outlet nozzle is connected to the lower end of the high-temperature water flow pipe, and the high-temperature water inlet / outlet nozzle is provided at the lower part of the tank, similarly to the low-temperature water inlet / outlet nozzle. And eliminates the need for work at heights for on-site connection piping work.

Although the water heat storage device can be composed of only one water heat storage tank, if the required heat storage capacity is large, the water heat storage device is configured by combining a plurality of the water heat storage tanks in parallel. Is preferred. Further, since the spiral steel pipe has a sufficient pressure resistance, it is preferable to use a water heat storage device in which the water heat storage tank is applied as a closed pressurized type.
As described above, it is preferable to use a plurality of water heat storage tanks in parallel to form a closed pressurized system.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described. However, the present invention is not limited to the following embodiments, and can be implemented with appropriate modifications. FIG. 1 shows a water heat storage tank according to a first embodiment of the present invention. The lids 16 and 18 made of steel plates are attached to the upper and lower ends of a long and large-diameter spiral steel pipe by welding or the like, thereby forming a closed and pressure-resistant tank body 20. Then, the water heat storage tank 21 is configured by distributing the distributors 22 and 24 and the high-temperature side water circulation pipe 30 in advance in the tank main body 20.

More specifically, an upper distributor 22 and a lower distributor 24 for forming a temperature stratification and maintaining high heat storage efficiency are provided in the upper and lower portions in the tank body 20.
The upper distributor 22 and the lower distributor 24 are provided with a plurality of openings 26 on the left and right sides of the horizontal tube in the longitudinal direction of the tube, from which water is discharged or sucked in the horizontal direction. . Therefore, a sufficient temperature stratification can be formed without disturbing the vertical temperature gradient in the tank body. The lower distributor 24 has a low-temperature side water inlet / outlet nozzle 2
8 is connected to the upper distributor 22, a high-temperature water flow pipe 30 hanging down along the inner wall of the tank body is connected, and a high-temperature water inlet / outlet nozzle 32 is connected to a lower end of the high-temperature water flow pipe 30. ing. The high-temperature-side water inlet / outlet nozzle 32 is provided at the lower part of the tank similarly to the low-temperature-side water inlet / outlet nozzle 28, and is configured so that piping work can be performed on the ground without providing a scaffold or the like.

When applied to a large-capacity water heat storage system,
As for one standardized water heat storage tank, it is advantageous in terms of economy to make the capacity as large as possible and complete the assembly up to the assembly at the manufacturing factory. In this embodiment, from the upper limit of production and transportation, the bore (inner diameter) is 2.5 m, the height of the body is 12 m, and the heat storage capacity is 58 m. Also,
Spiral steel pipe STP with a thickness of 10 mm on the body plate of the tank body
Y400 is used, and the outer surface of the tank body 20 is coated with a heat insulating material layer 34 for keeping cool. 36 is a fixing member for the high temperature side water flow pipe, and 38 is a manhole.

FIGS. 2 to 5 show a water heat storage device according to a second embodiment of the present invention. A water heat storage device is configured by combining a plurality of water heat storage tanks 21 according to the first embodiment (four tanks in this embodiment as an example) in parallel. The water heat storage device including the water heat storage tanks 21a, 21b, 21c, and 21d as shown in FIG. 5 is incorporated in an existing cooling system as shown in FIG. 6, and a heat storage type cooling system as shown in FIGS. Constitute.

FIG. 2 shows a normal operation flow.
The line indicated by the bold line is operating. That is, the chilled water cooled by the refrigerators 10a, 10b, and 10c, for example, around 7 ° C. is supplied to the cooling load side of the air conditioner 12, etc., and the water used for cooling, for example, around 12 ° C.
a and 14b return to the refrigerators 10a, 10b and 10c for circulating use. In addition, the white valve shows the open state,
A black valve indicates a closed state.

At the time of the heat storage operation at night, as shown in FIG.
Cold water cooled at about 5 ° C., for example, cooled by the refrigerator 10a is supplied to the water heat storage tanks 21a to 21d in the low-temperature side water pipes 40b, 40a,
40 and the water heat storage tanks 21a to 21a.
The high-temperature side water in 21d is slowly pushed out and returned to the inlet side of the cold water pump 14a via the high-temperature side water pipe 42, the bypass pipe 46, and the high-temperature side water pipe 42b. The water pressurized by the cold water pump 14a is introduced into the refrigerator 10a via the discharge pipe 44, cooled to, for example, about 5 ° C., and cooled through the low-temperature water pipes 40b, 40a, 40, and the water heat storage tank 21 is cooled.
a to 21d.

In the daytime heat dissipation operation, as shown in FIG.
The cold water pump 14a is driven, and the discharge pipe 44, the high temperature side water pipes 42b and 42a, the temperature control valve 48, the high temperature side water pipe 4
2, which were stored in the water heat storage tanks 21a to 21d.
For example, cold water of about 5 ° C. is supplied to the cooling load side of the air conditioner 12 or the like and used for cooling or the like. From the air conditioner 12, for example, 12
The water of about ° C. is sent to the chilled water pump 14a, and the pressure is increased and the discharge pipe 44, the high temperature side water pipes 42b and 42a, the temperature control valve 4
8. Returned to the water heat storage tanks 21a to 21d via the high temperature side water pipe 42.

The high temperature water pipe 42a is provided with a temperature control valve 48. The temperature control valve 48 and the low-temperature side water pipe 40a are connected via a high-temperature side water branch pipe 50, and the temperature downstream of the junction of the low-temperature side water pipe 40a and the high-temperature side water branch pipe 50 is reduced. For example, low-temperature side water of about 5 ° C and 1
The temperature control valve 48 is configured to be opened and closed by a temperature detection controller 52 so as to be mixed with high-temperature side water of about 2 ° C., for example, at about 7 ° C.

An example of the design conditions of the second embodiment shown in FIGS. 2 to 4 is shown below. Cold water heat storage temperature: 6 ° C Cold water supply / return temperature: 10 ° C / 15 ° C Cold water supply amount: 126 T / h Cold load: 630,000 kcal / h Heat storage capacity: 3 hours For the cooling system of FIGS. As in the case of the existing cooling system shown in (1), the closed type system can be configured as it is, so that the existing chilled water pump can be used as the pump.

[0017]

As described above, the present invention has the following effects. (1) As a material for the tank body, a low-cost large-diameter spiral steel pipe, which is a commercially available standard product, is used, and it has a simple structure with only upper and lower lids attached. In addition, since the distributor and the high-temperature-side water flow pipe are preliminarily incorporated into the inside, cost reduction can be achieved, and by using a long pipe to increase the water depth, a sufficient temperature stratification can be formed. , High heat storage efficiency can be achieved. (2) Since it is a structure that can be installed in an open space outdoors, a water heat storage system can be easily introduced into existing non-heat storage cooling equipment for peak shifting and peak cutting. (3) Adjustment of increase / decrease in heat storage capacity can be achieved by appropriately increasing / decreasing the number of tanks standardized in one design / manufacturing and using them in combination in parallel. (4) Spiral steel pipe of standard thickness has sufficient pressure resistance, so it can be applied to a closed system as it is without any special action, and does not require a new chilled water circulation pump. In addition, when introducing the water heat storage tank or the water heat storage device of the present invention into existing non-heat storage cooling equipment, the existing chilled water pump can be used, and a new chilled water circulation pump can be used. No need to provide. (5) Since the high-temperature side water inlet / outlet nozzle is provided at the lower part of the tank like the low-temperature side water inlet / outlet nozzle, piping work can be easily performed on the ground without providing a scaffold or the like.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view of a water heat storage tank according to a first embodiment of the present invention.

FIG. 2 is a flow sheet showing a normal operation state in a device in which the water heat storage device according to the second embodiment of the present invention is incorporated in an existing non-heat storage cooling system.

FIG. 3 is a flow sheet showing a state in which the apparatus shown in FIG. 2 is switched to nighttime heat storage operation.

FIG. 4 is a flow sheet showing a state in which the apparatus shown in FIG. 3 is switched to a daytime heat dissipation operation.

FIG. 5 is an enlarged perspective view of the water heat storage device in FIGS.

FIG. 6 is a flow sheet showing a conventional existing cooling device.

[Explanation of symbols]

 10a to 10c Refrigerator 12 Air conditioner 14a, 14b Cold water pump 16, 18 Lid 20 Tank body 21, 21a to 21d Water heat storage tank 22 Upper distributor 24 Lower distributor 26 Opening 28 Low-temperature side water inlet / outlet nozzle 30 High-temperature side water flow pipe 32 High-temperature side water inlet / outlet nozzle 34 Insulating material layer 36 Fixing member 38 Manhole 40, 40a, 40b Low-temperature side water pipe 42, 42a, 42b High-temperature side water pipe 44 Discharge pipe 46 Bypass pipe 48 Temperature control valve 50 High-temperature side water branch pipe 52 Temperature detection controller

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideo Tanaka 3-1-1 Higashikawasakicho, Chuo-ku, Kobe Kawasaki Heavy Industries, Ltd. Kobe Plant (72) Inventor Hironori Tajiri 3-1-1 Higashikawasakicho, Chuo-ku, Kobe-shi No. 1 Inside the Kobe Plant of Kawasaki Heavy Industries, Ltd. (72) Inventor Soichiro Shibata 1-3-1, Uchisaiwaicho, Chiyoda-ku, Tokyo Tokyo Electric Power Company (72) Inventor Takeshi Hamayashiki 1, Uchisaichicho, Chiyoda-ku, Tokyo No. 1-3 Tokyo Electric Power Company

Claims (4)

[Claims] A steel plate lid is joined to an upper end and a lower end of a long spiral steel pipe to form a closed and pressure-resistant tank body, and a distributor and a high-temperature-side water flow pipe are incorporated inside the tank body. A water storage tank characterized by the following. 2. A distributor comprises an upper distributor and a lower distributor, a lower-temperature side water inlet / outlet nozzle is connected to the lower distributor so as to be located at a lower part of the tank, and a high-temperature side water distribution pipe is connected to the upper distributor. Is connected to the lower end of the high-temperature side water flow pipe, and the high-temperature side water inlet / outlet nozzle is provided at the lower part of the tank, similarly to the low-temperature side water inlet / outlet nozzle. Item 7. A water heat storage tank according to Item 1. 3. A water heat storage device comprising a plurality of the water heat storage tanks according to claim 1 arranged in parallel. 4. The water heat storage device according to claim 3, wherein the water heat storage tank is applied as a closed pressurized type.