JP2003004263A - Internally melting ice-thermal-storage apparatus and operation thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an internally melting ice-thermal-storage apparatus and operation thereof, in which ice formed on an exposed part in an ice-thermal- storage tank can be rapidly melted at the time of a melting operation. SOLUTION: In the internally melting ice-thermal-storage apparatus, water held in the tank 1 is iced or the ice in the tank is melted by allowing a heating medium 11 to flow in a heat exchanger 2 placed in a tank 1. A sprinkler 5 is provided for sprinkling water in the tank 5 to a part exposed from a water surface A in the heat exchanger and inlet/outlet pipes 3 or inlet/outlet headers 4 in connection thereto. The sprinkler 5 is provided with a suction pipe 6, a pump 7, a spray header 8, and a spray nozzle 9. A heater using the heating medium 11 or an electric heater as the heat source may be placed along respective parts. In the operation of the apparatus, it is advisable the sprinkler is activated a predetermined time after the start of ice melting operation, and that the heater is activated after a predetermined time.

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 device, and more particularly, to an internal melting type ice heat storage device for making and defrosting water held in a water tank and a method of operating the same.

[0002]

2. Description of the Related Art A conventional internal melting type ice heat storage device will be described with reference to FIGS. In the ice heat storage device 1, the liquid level of water as a heat storage agent changes as shown in FIG. Highest liquid level A after ice heat storage is completed, and lowest liquid level A'after all ice is thawed
Becomes On the part 3 exposed from the highest liquid level A, ice 13
As a result, ice adheres to the exposed part, the amount of liquid decreases, and the maximum liquid level A decreases. Initial liquid level A
In contrast to (when ice making / thawing A ′), when ice grows on the upper part and the ice does not thaw, it becomes like B (when ice making / thawing B ′ of heat storage section). Further, as shown in FIG. 4 (a), the ice 13 as the heat storage agent may be melted by the direct heat from the heat exchange coil 10 or the heat medium pipe. Between 13 1 of liquid water
4 enters and the ice 13 melts via water. On the other hand, FIG.
As shown in (b), when the ice 13 attached to the exposed portion is melted by the direct heat from the heat medium 11, water drops and an air layer 15 is formed between the coil and the pipe and the ice, It becomes a heat-insulating layer that hardly conveys, and the ice 13 is in a state where it does not melt easily. By repeating the growth of ice every day, the ice in the exposed area also increases, the amount of water acting as a heat storage agent decreases, and the heat storage capacity decreases. Further, there is a problem that the header is deformed or broken due to the weight of ice on the exposed portion.

[0003]

DISCLOSURE OF THE INVENTION In view of the above-mentioned prior art, the present invention provides an internal melting type ice heat storage device capable of quickly thawing ice adhering to an exposed portion in an ice heat storage tank during a thawing operation. And to provide a driving method thereof.

[0004]

In order to solve the above problems, according to the present invention, a heat medium is caused to flow inside a heat exchanger installed in a water tank so that the water held in the water tank is iced or thawed. In the melting type ice heat storage device, the heat exchanger and an inlet / outlet pipe or an inlet / outlet header connected to the heat exchanger are provided with a spraying device for spraying water in the water tank in a portion exposed from the water surface in the water tank. It is what In the ice heat storage device, the spraying device has a suction pipe, a pump, a spray header and a spray nozzle, and a heater can be provided along each part of the spraying device, and the heater has a heat source. It can be a heat carrier flowing inside the heat exchanger or it can be an electric heater.
Further, in the present invention, in the method for operating the internal melting type ice heat storage device, the spraying device is to be operated after a predetermined time has elapsed after the start of the deicing operation, and when a heater is provided, , Operate the heater from the thaw operation,
After that, it is preferable to operate the spraying device after a predetermined time has elapsed.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, in an internal melting type ice heat storage device, a lump of ice generated on the liquid surface of an ice heat storage tank is quickly thawed during the thaw operation to act as a heat storage agent. The reduction of the amount of water is prevented, and the heat storage capacity can be maintained in an efficient state. In the internal melting type ice heat storage device,
The ice grows on the ice heat storage tank because the water temperature of the heat storage tank has risen to about 4 to 8 ° C after the completion of the thaw, and the air layer on the water surface is about water temperature to water temperature + 1 ° C. Humidity is 80-1
It is about 00%, and from this state, the ice making operation starts, the piping or header on the heat medium inlet side becomes a negative temperature,
Humidity in the air freezes on the surfaces of pipes and headers.
Then, when the water content in the air decreases, the water in the water tank vaporizes and is replenished in the air, and such evaporation and freezing continues until the temperature in the water tank reaches almost 0 ° C. The ice will grow and eventually become a block of ice.

Next, description will be made with reference to the drawings. FIG. 1 is a cross-sectional configuration diagram showing an example of an internal melting type ice heat storage device of the present invention,
(A) is a front view and (b) is a plan view. In FIG. 1, 1 is an ice storage tank, 2 is a heat exchanger (coil), 3 is an inlet / outlet pipe, 4 is an inlet / outlet header, 5 is a spray pipe, 6 is a suction pipe, 7 is a pump, 8 is a spray header, 9 is The spray nozzle 11 is a heat medium. In the operation of the ice heat storage device of FIG. 1, in the ice making operation, the heat medium (brine) 11 at 0 ° C. or less passes from the inlet / outlet pipe 3 through the inlet / outlet header 4,
The water that is supplied to the heat exchanger 2 and is the heat storage agent in the ice heat storage tank 1 is frozen to store heat. At this time, ice adheres to the inlet / outlet pipe 3 and the header 4 exposed from the water surface A ′ of the ice heat storage tank.

Next, in the thaw operation, the heat medium (brine) 11 having a temperature of, for example, 10 ° C. or higher used for cooling is
It is supplied from the inlet / outlet pipe 3 through the inlet / outlet header 4 to the heat exchanger 2 and gives heat to the ice in the ice heat storage tank so that it is cooled and used for cooling. As a result, the ice in the tank 1 gradually melts into water. Then, after a lapse of a predetermined time,
By driving the pump 7 of the spraying device, the melted water passes from the suction pipe 6 through the spray header 8 and is sprayed from the spray nozzle 9 of the spraying pipe 5 onto the ice generated on the pipes above the water surface, the header, etc. in the ice making operation. Being melted, this ice goes. As described above, since the ice generated in the ice making operation is thawed each time in the ice making operation, it does not become a large block of ice and the ice is quickly released and the liquid surface of the ice storage tank 1 is The water level A is always kept constant, and the water level never decreases. Also, once the spray pipe 5 freezes, the water to be sprayed cannot be supplied or distributed unless there is a heat source to thaw it. Therefore, it is preferable to attach a heater that gives heat to the spray pipe 5.

2 (a) and 2 (b) are partial explanatory views of the spray pipe 5 having the heater coil 10 installed therein. Figure 2
In (a), the coil 1 through which the heat medium 11 having the valve 12 passes
0 is wound around the outer circumference of the spray pipe 5, and in FIG. 2 (b),
The coil 10 is passed through the inside of the spray pipe 5, and even if the ice inside the spray pipe 5 is prevented from freezing by passing the heat medium 11 through the coil 10 through the coil 10 during the ice making operation. Good, and it can be melted by passing through a heat medium at the time of thawing. Although not shown in the figure, an electric heater may be used. For example, there is a method in which the coil 10 in FIG. 2A is used as a heater and the valve 12 is used as an electric switch.
In addition, in the configuration as shown in FIG. 2, on the coil side during the ice making operation,
The flow path may be secured by supplying heat from the condenser (refrigerant, cooling water, etc.).

[0009]

According to the present invention, in the internal melting type ice heat storage device, the ice generated on the water surface in the ice heat storage tank can be completely melted during the defrosting operation, and the heat storage agent in the ice heat storage tank can be melted. The amount of water acting as a can be kept constant without decreasing, and the ice storage tank could be effectively used.

[Brief description of drawings]

FIG. 1 is a cross-sectional configuration diagram showing an example of an internal melting type ice heat storage device of the present invention, in which (a) a front view and (b) a plan view.

FIG. 2 is a partial explanatory view of a spray pipe used in the present invention.

FIG. 3 is a cross-sectional configuration diagram showing an example of a conventional internal melting type ice heat storage device, (a) a front view and (b) a plan view.

4 is a cross-sectional explanatory view of the inlet / outlet pipe of FIG.

[Explanation of symbols]

1: Ice heat storage tank, 2: Heat exchanger (coil), 3: Inlet / outlet pipe, 4: Inlet / outlet header, 5: Dispersion pipe, 6: Suction pipe,
7: Pump, 8: Spray header, 9: Spray nozzle, 10: Coil, 11: Heat medium, 12: Valve, 13:
Ice, 14: Water, A, A ': Water level

Claims (5)

[Claims] 1. An internal melting type ice heat storage device for flowing a heat medium into a heat exchanger installed in a water tank to make or thaw the water held in the water tank, and to communicate with the heat exchangers. An internal melting type ice heat storage device, characterized in that a spraying device for spraying water in the water tank is provided in a part of the water inlet / outlet pipe or the header / outlet which is exposed from the water surface in the water tank. 2. The spraying device has a suction pipe, a pump, a spray header and a spray nozzle, and a heater is provided along each part of the spraying device. Internal melting ice heat storage device. 3. The internal melting type ice heat storage device according to claim 2, wherein the heater is a heat medium whose heat source flows inside the heat exchanger or an electric heater. 4. The method for operating an internal melting type ice heat storage device according to claim 1, 2 or 3, wherein the spraying device is operated after a predetermined time has elapsed after the start of the ice melting operation. Operation method of melting type ice heat storage device. 5. The method for operating an internal melting type ice heat storage device according to claim 2 or 3, wherein the spraying device operates the heater after the defrosting operation, and then operates after a predetermined time has elapsed. And a method for operating an internal melting type ice heat storage device.