JP3192866B2 - Thermal storage tank for dynamic ice thermal storage system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a thermal storage tank of a dynamic ice thermal storage system.

[0002]

2. Description of the Related Art A dynamic ice thermal storage system has been developed as a measure for leveling the power load during the day and night. Ice is stored in a thermal storage tank by using ice produced by a refrigerator using excess power at night. This is a system that melts this into cold water and uses it for cooling.

[0003] This system utilizes a supercooling phenomenon in which water does not become ice under certain conditions even when the temperature of the water becomes 0 ° C or lower. First, water is directly cooled by a refrigerator and supercooled water (water of 0 ° C or lower) is used. )make. Since the supercooled water has a fluidity in the form of a sherbet, the supercooled water is flowed through a pipe to the heat storage tank, diffused into the entire heat storage tank in which water is stored in advance, and the supercooled state is released in the water to generate ice.

[0004] As shown in Fig. 2, a conventional heat storage tank has an ice making suction pipe 12 for guiding water in the tank to a supercooler to form supercooled water, and an inside of the tank. Is provided with a thawing pipe 13 for guiding the cold water to the cooling load. In addition, a supercooling water pipe 14 for guiding supercooled water from the supercooler and an ice-melting sprinkling pipe 15 for guiding water returning from the cooling load are provided above the tank 11. Reference numeral 16 denotes a collision plate for diffusing supercooled water, and reference numeral 17 denotes a cold water suction strainer.

FIG. 3 is a schematic system diagram of the ice heat storage system. In the ice heat storage system shown in FIG. 3, water sucked through the ice making suction pipe 12 at night is cooled by the supercooler 20 of the refrigerator 19 to become supercooled water, and the supercooled water pipe 14
Is returned to the heat storage tank 11 and stored. In the daytime, the cold water sucked from the ice melting suction pipe 13 is supplied to the cooling load 21 to serve as ice melting return water and is sprayed from the ice melting water spray pipe 15 to the heat storage tank 11.

[0006]

According to the structure of the conventional heat storage tank described above, when the ice is thawed, the return water used for cooling, which has been sprayed from the deicing water spray pipe 15 into the upper space in the tank 11, is supplied to the tank. 11
The water comes into contact with the ice inside and becomes cold water, and is sucked into the suction pipe 12 for ice making and the suction pipe 13 for melting ice at the bottom of the tank 11.

In this case, the return water that has made sufficient contact with the ice in the tank 11 becomes cold water of about 1 ° C. to 2 ° C. However, if the contact with the ice is short-circuited or insufficient, the return water is subjected to heat exchange. Is not as planned, but becomes water having a large specific gravity around 4 ° C., and reaches the bottom of the tank 11 in advance. Therefore, in such a state, the water sucked from the tank 11 from both the suction pipes 12 and 13 is always high-temperature water near 4 ° C.

SUMMARY OF THE INVENTION The present invention has been made in order to solve this drawback, and it is an object of the present invention to provide a dynamic ice heat storage system which is capable of constantly sucking low-temperature cold water from an ice heat storage tank.

[0009]

SUMMARY OF THE INVENTION According to the present invention, cold water in a heat storage tank is led to a supercooler by a suction pipe for ice making and cooled in a supercooled state, and the supercooled water is stored in a supercooled water pipe through a supercooled water pipe. A dynamic ice heat storage system in which heat is stored by returning ice into the tank and releasing supercooling to generate ice, and circulating cold water in the heat storage tank to the load side through a defrosting suction pipe and a return water pipe. In order to solve the above-described problem in the heat storage tank, a screen for preventing ice floating is provided at a portion below the surface of the cold water above the heat storage tank, and a draft pipe for ice making and a draft pipe for defrosting are provided below the surface of the screen. While arranging,
A supercooled water pipe and a return water pipe are provided near the bottom of the heat storage tank.

The ice heat storage tank having the above-described structure according to the present invention operates as follows. Since the supercooled water flows into the bottom of the tank, the return of water near 4 ° C. at the bottom of the tank allows the supercooling to be smoothly released and the ice blocks to be easily formed. Also, since the return water is supplied to the bottom of the tank, the flow of the return water flows from the lower part to the upper part of the tank, and heat exchange with the ice held by the ice floating prevention screen is facilitated.

Further, since water for making ice and water for melting ice are sucked from below the water surface at the upper part of the screen, water cooled by the ice at the lower part of the screen and having a low temperature is sucked out, and high-temperature water as in the conventional case is sucked. The situation that water is sucked out does not occur. The screen employed in the heat storage tank according to the present invention may be constituted by a punched metal or a wire mesh, and can be manufactured at extremely low cost.

Further, in the heat storage tank according to the present invention, it is preferable that a return water pipe from the cooling load to the heat storage tank is branched into two, and disposed near the bottom of the heat storage tank and at an intermediate position below the screen.

[0013] In this configuration, the return water is supplied to the portion where the ice is present by switching the return water to the return water pipe located at the intermediate position at the lower part of the screen, so that 4 ° C. Water with a large specific gravity in the vicinity stagnates, and low-temperature water (cold water) of 4 ° C. or less floats on the screen at the top of the tank through the ice part, so that low-temperature cold water is easily sucked from the ice making and de-icing suction pipes. Become.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a heat storage tank according to the present invention will be specifically described based on one embodiment shown in FIG. In FIG. 1, reference numeral 1 denotes a heat storage tank, and a screen 2 made of a punching metal, a wire mesh, or the like for preventing ice floating is installed above the heat storage tank 1 and below the water surface. In the water at the bottom of the heat storage tank 1,
A supercooling water pipe 3 for introducing water cooled by a subcooler of a refrigerator (not shown) and turned into supercooling water is provided.

A return water pipe 4 for guiding water returning from a cooling load (not shown) is provided in the water at the bottom of the heat storage tank 1.
Are arranged. The return water pipe 4 has a branch return water pipe 4 ′ which is branched upward at an inlet portion thereof and disposed at an intermediate position where the ice exists below the screen 2. On / off valves 7, 8 are interposed in the return water pipes 4, 4 ', respectively. Above the screen 2 for preventing ice surfacing, the heat storage tank 1 below the surface of the water is provided in the heat storage tank 1 and a suction pipe 5 for making ice to supply supercooling water to the supercooler, and a solution for guiding the cold water in the tank to a cooling load. An ice suction pipe 6 is provided.

The heat storage tank of the present embodiment has the above-described structure, and the supercooled water flows into the tank bottom from the supercooled water pipe 3 disposed at the bottom of the tank, and therefore exists at the bottom of the tank. The supercooling is promptly released by the water in the vicinity of ° C., and the formation of ice blocks in the tank is smoothly performed. The return water is guided to the return water pipe 4 disposed at the bottom of the tank or the return water pipe 4 ′ disposed at an intermediate position below the screen 2.

When the return water is introduced into the tank 1 from the return water pipe 4 at the bottom of the tank, the flow of the return water flows from the lower part to the upper part of the tank and heat exchange with ice is facilitated.

On the other hand, when the return water pipe 4 'is switched to guide the return water, the return water is supplied to the ice level portion below the screen 2, so that water having a high specific gravity around 4 ° C. stagnates at the bottom of the tank. The low-temperature water (cold water) of 4 ° C. or less floats on the screen 2 at the upper part of the tank through the ice portion below the screen 2, and is provided therewith. It is easy to be sucked from. As described above, in the heat storage tank according to the present embodiment, low-temperature water is sucked out, and a situation in which high-temperature water is sucked out unlike the conventional one does not occur.

[0019]

According to the thermal storage tank of the dynamic ice thermal storage system of the present invention, since the return water pipe is disposed at the bottom of the tank, the return water pipe is disposed.
Water with a large specific gravity near ℃ accumulates at the bottom of the heat storage tank,
The supercooled water pipe is provided at the bottom of the tank, and the low-temperature cold water floats at the top of the tank, passes through the ice block, and collects water at the top of the screen. Therefore, it is easy to suck low-temperature water for ice making and de-icing by the suction pipe arranged at the top of the screen, and there is no need to worry about sucking high-temperature water as in the current heat storage tank. Ice storage is realized.

Further, in a configuration in which the return water pipe is branched and disposed also at an intermediate position below the screen, return water is supplied to a place where ice exists below the screen,
The return water cooled by the ice floats on the upper part of the screen, so that the low-temperature cold water is easily sucked.

[Brief description of the drawings]

FIG. 1 is a schematic view of a heat storage tank according to one embodiment of the present invention.

FIG. 2 is a schematic view of a conventional heat storage tank.

FIG. 3 is a schematic diagram of a dynamic ice heat storage system using the heat storage tank shown in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thermal storage tank 2 Screen 3 Supercooled water pipe 4, 4 'Return water pipe 5 Ice making draft pipe 6 Ice melting draft pipe 7, 8 On-off valve

Claims (3)

(57) [Claims] The cooling water in the heat storage tank is led to a supercooler by an ice-making suction pipe and cooled to a supercooled state. The supercooled water is returned to the heat storage tank via a supercooling water pipe to release the supercooling. In the heat storage tank of the dynamic ice heat storage system, which stores the heat by generating ice and circulates the cold water in the heat storage tank to the load side through the suction pipe for defrosting and the return water pipe, An ice floating prevention screen is provided at a location below the surface of the cold water at the upper part, and the ice making suction pipe and the ice melting suction pipe are arranged below the water upper part of the screen, and the near the bottom of the heat storage tank. A heat storage tank for a dynamic ice heat storage system, comprising a supercooled water pipe and a return water pipe. 2. The heat storage tank of the dynamic ice heat storage system according to claim 1, wherein the screen is made of a perforated metal or a wire mesh. 3. The heat storage tank of the dynamic ice heat storage system according to claim 1, wherein the return water pipe is branched and disposed near the bottom of the heat storage tank and at an intermediate position below the screen.