JP3328898B2 - Operation method of ice heat storage tank and ice heat storage tank device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation method of an ice heat storage tank used as a heat source of an air conditioning system and the like, and an ice heat storage tank apparatus.

[0002]

2. Description of the Related Art Ice storage tank devices are roughly classified into a liquid type for storing ice having fluidity and a solid type for storing ice on a heat transfer surface. Of these, the solid type is
An ice making coil is provided in the tank to form hollow ice on the tank wall side in the tank, and water circulating between the tank and the secondary load is brought into contact with the inner peripheral surface of the ice. The heat of melting of the ice cools the water returning to the secondary load.

[0003]

The solid-type ice heat storage tank has the advantages of a higher ice filling rate (IPF) and a simpler structure than the liquid-type ice heat storage tank. However, the conventional solid-type ice heat storage tank device stratifies the flow of water in the tank, and sends high-density cold water of about 4 ° C. from the bottom of the tank. However, in this method, the melting ice becomes uneven due to the position of the return water inlet and the water supply port, the flow rate of the return water and the water supply, and the state of the ice remaining in the ice making coil varies depending on the location. When the ice remains in a certain part (blocking phenomenon), there is a problem that the utilization of the cold energy becomes insufficient or the ice making efficiency at the remaining ice part decreases during the ice making operation.

In addition, a return port for returning water from the secondary load must be provided at the upper end of the tank, and a water supply port for sending water to the secondary load must be provided at the lower end of the tank. Subject to the restrictions. In addition, the uneven melting of ice at the time of taking out cold heat makes it impossible to predict the temperature of cold water to be supplied to the secondary load. It was necessary to provide a piping system such as a control system and a bypass pipe. For this reason, various restrictions must be imposed on design and operation. For example, at the start of the ice making operation, there are various restrictions on the operation and design such as recommending an operation for completely melting the ice in the heat storage tank. There is a problem that. In view of the above situation, an object of the present invention is to obtain an operation method of an ice heat storage tank and an ice heat storage tank apparatus that make use of the characteristics of a solid ice storage tank apparatus and that solve the problems of the conventional solid ice storage tank. .

[0005]

According to a first aspect of the present invention, there is provided a method for operating an ice heat storage tank, wherein an ice making coil is provided concentrically with the tank in a cylindrical tank, and a center portion is provided around the ice making coil. , And water circulating between the tank and the secondary load is brought into contact with the inner peripheral surface of the ice, and the water is cooled by the heat of melting of the ice. In the ice thermal storage tank returning to the secondary load,
A swirling flow is generated in water returning from the secondary load to the ice storage tank.
While squirting the water into the hollow ice,
The inner peripheral surface uniformly thawed by water of the swirling flow, the cooling water is characterized in that as out feeding the secondary load, by providing such a configuration, it is cooled by the ice heat of fusion Thus, the temperature change of water returning to the secondary load can be reduced from the start of operation to the end of operation.

According to the second aspect of the present invention, in the ice heat storage tank device, an ice-making coil is provided concentrically with a cylindrical tank, and the ice-making coil is hollow except for a central portion around the ice-making coil. The ice circulating between the tank and the secondary load is brought into contact with the inner peripheral surface of the ice, and the water is cooled by the heat of melting of the ice to form a secondary load. In the ice storage tank to be returned,
A return port for returning water from the secondary load and a water supply port for sending water to the secondary load are provided, and a pipe is provided at a central position of the tank over substantially the entire length of the tank, and one end of the pipe is connected to the return port. A large number of through-holes or slits are provided over substantially the entire length of the pipe so as to communicate with each other and discharge the return water in a direction to generate a swirling flow in the tank. By simply providing return water from a large number of through holes or slits, a swirling flow can be easily generated in the tank, and the swirling flow forms a hollow ice excluding a central portion. Is in contact with the swirling flow on its inner peripheral surface and is almost uniformly thawed. With this, the temperature change of the water cooled by the heat of melting of the ice and returned to the secondary load is changed from the operation start to the operation end Can be reduced until time.

[0007]

Embodiments of the present invention will be described with reference to the drawings. In the drawing, reference numeral 1 denotes a cylindrical vertical tank, and 2 denotes a spiral ice-making coil provided concentrically with the tank 1 in the tank 1. The tank 1 is provided at one of its upper and lower ends with a return water port 3 for returning water from the secondary load A, and at the other end with the secondary load A
A water outlet 4 for sending out water is provided at a central position of the tank 1,
A pipe 5 connected to the water return port 3 and extending over substantially the entire length of the tank 1 was provided.

In FIG. 1 to FIG. 4, the pipe 5
A large number of through holes 6 are provided in the length direction of
The swirling flow is generated in the tank 1 by the return water flowing out of the tank. This will be described in further detail. The pipe 5 is configured as a bottomed cylinder having a bottom plate 5a, the upper end of which is communicated with the return water port 3 provided at the upper end of the tank 1, and the length of the pipe 5 is set in the length direction. , Rows of through-holes 6 extending substantially in the tangential direction of the pipe 5 and two vertical rows at target positions on a line including the centers of the pipes 5. Although a large number of the through holes 6 are arranged at equal intervals in the length direction of the pipe 5, it is needless to say that this interval can be changed as needed.

Both ends of the ice making coil 2 are connected to a refrigerator 7 provided outside the tank 1 via a refrigerant pipe 8, and a refrigerant pump 9 provided in the refrigerant pipe 8 refrigerates the refrigerant with the ice making coil 2. Cooling is performed by a refrigerant circulating between the ice making device 7 and the ice making coil 2, and a hollow ice layer B excluding a central portion is generated around the ice making coil 2. In the illustrated embodiment, a counterclockwise flow of water is generated in the tank 1, but it goes without saying that the flow may be clockwise.

In the drawing, a return water port 3 is provided at the upper end of the tank 1 and a water supply port 4 is provided at the lower end of the tank 1. However, the return water port 3 is provided at the lower end of the tank 1, and the water supply port is provided at the upper end of the tank 1. 4 may be provided, and the return water port 3 and the water supply port 4 may both be provided at the upper end of the tank 1 or both may be provided at the lower end of the tank 1. That is, tank 1
The position of the return water port 3 and the water supply port 4 provided in the tank 1 may be any position that easily generates a swirling flow in the tank 1 and does not hinder the swirling flow.

FIG. 5 and FIG. 6 show another embodiment, in which a slit 10 which is continuous in the length direction of the pipe 5 is provided, and the return water flowing out of the slit 10 is used for the tank 1. A swirling flow is generated in the inside. This will be described in further detail. The pipe 5 is formed by vertically dividing a cylindrical pipe into two parts, and closing the upper and lower parts thereof with closing plates 5c, 5c with the dividing surfaces 5b, 5b shifted left and right. Face 5
slits 1 opening in opposite directions between b and 5b
0 was formed. The number of the slits 10 is not limited to two, but may be three or more. The other configuration is the same as the above embodiment.

The tank 1 is as follows.

Heat storage tank diameter 0.35φ Height 2m Ice making range diameter 0.15φ ~ 0.20φ Ice filling rate (IPF) About 65% ~ 80% Heat storage amount about 12Mcal

[0014]

As described above, according to the operation method of the ice storage tank of the first aspect of the present invention, the ice formed in a hollow shape around the ice making coil except for the central portion is returned on the inner peripheral surface thereof. Ice can be thawed almost uniformly in contact with the swirling flow caused by water, thereby preventing blocking caused by repetition of uneven ice melting and ice making and stabilizing the temperature of water taken out from the water supply port With this, the temperature change of the water that is cooled and taken out from the water supply port from the start of operation to the end of operation is reduced, and the performance of the ice heat storage tank device can be predicted. In addition, the operational restrictions are reduced, and the heat storage capacity can be standardized and the device can be easily unitized.

According to the second and third aspects of the present invention, a pipe extending substantially the entire length of the tank is provided at the center of the tank, and one end of the pipe is communicated with the return water port. In addition, a large number of through-holes or slits for discharging return water in a direction that generates a swirling flow in the tank are swirled into the tank with a simple configuration that is opened over the length of the pipe. A flow can be generated, thereby preventing blocking generated by repetition of uneven ice melting and ice making, and stabilizing the temperature of water taken out from the water supply port. The temperature change of the water that is cooled and taken out of the water supply port from the start of operation to the end of operation is reduced, and the performance of the ice heat storage tank device can be predicted.This reduces the design and operation restrictions. And conventional Also increased freedom of Mizuguchi the water outlet mounting position instead of the relative tank intended to standardize the heat storage capacity can be easily unitized device.

[Brief description of the drawings]

FIG. 1 is a system diagram showing an example of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is an enlarged perspective view of a water supply pipe taken out.

FIG. 4 is a cross-sectional view of FIG.

FIG. 5 is a perspective view showing a modification of the water supply pipe.

6 is a cross-sectional view of FIG.

[Explanation of symbols]

 1 tank 2 ice making coil 3 return water port 4 water supply port 5 pipe 6 through hole 10 slit

────────────────────────────────────────────────── ─── Continuation of the front page Examiner Hiroyuki Kondo (56) References JP-A-1-318826 (JP, A) JP-A-1-318827 (JP, A) JP-A-4-332391 (JP, A) JP-A-7-174369 (JP, A) JP-A-6-300320 (JP, A) JP-A-7-91692 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24F 5 / 00 102

Claims (3)

(57) [Claims] An ice making coil is provided in a cylindrical tank concentrically with the tank, and a hollow ice is formed around the ice making coil except for a central portion thereof, and the inside of the tank and a secondary load are formed. In the ice heat storage tank that contacts the inner peripheral surface of the ice to cool the water with the heat of melting of the ice and returns the water to the secondary load. To create a swirling flow in the water returning to
First, the water is spouted into the hollow ice, and
A method for operating an ice heat storage tank, characterized in that ice is uniformly melted on a peripheral surface by the swirling flow of water , and cooled water is sent to a secondary load . 2. An ice making coil is provided in a cylindrical tank concentrically with the tank, and hollow ice is formed around the ice making coil except for a central portion thereof, and the inside of the tank and a secondary load are formed. The water circulating between the ice and the inner peripheral surface of the ice is brought into contact with the ice to cool the water with the heat of melting of the ice and return to the secondary load. A return port for returning water and a water supply port for sending water to the secondary load are provided, a pipe is provided at a central position of the tank over substantially the entire length of the tank, one end of the pipe communicates with the return port, and An ice heat storage tank device comprising a plurality of through holes for discharging return water in a direction in which a swirling flow is generated in the tank over substantially the entire length of the pipe. 3. An ice-making coil is provided concentrically with a cylindrical tank in a cylindrical tank, and hollow ice is formed around the ice-making coil except for a central portion thereof, and a secondary load is applied to the inside of the tank. Water that circulates between the ice and the inner peripheral surface of the ice to cool the water with the heat of melting of the ice and return the water to the secondary load. A water return port for returning water to the secondary side load, a pipe extending substantially the entire length of the tank at a central position of the tank, one end of the pipe communicating with the return water port, and An ice heat storage tank device, wherein a slit for discharging return water in a direction in which a swirling flow is generated is provided over substantially the entire length of the pipe.