JPS6341747A - Cold thermal energy storing system - Google Patents

Abstract

PURPOSE:To store a large quantity of cold thermal energy in a heat accumulating tank by suspending a container filled with water in the heat accumulating tank filled with antifreeze liquid and immersing a vaporizer of a freezer in the antifreezing liquid. CONSTITUTION:Refrigerant gas delivered by a compressor 2 is condensed by a condenser 3, and cools antifreezing liquid in a vaporizer 10 after going through an adiabtic expansion in an expansion valve 5. As the antifreeze liquid cooled in the vaporizer 10 descends through gaps between containers 11 and circulates in a heat accumulating tank 1 by convection, water in the container 11 is efficiently cooled and all of it become frozen to store cold thermal energy in the heat accumulating tank 1. In order to recover said cold thermal energy, a brine pump is operated. The antifreezing liquid is drawn by the brine pump 6 to enter a radiator 9 where it is heated by releasing the heat and returns to the upper part of the heat accumulating tank 1. As the ice in the container 11 is positioned higher due to a difference in the specific gravity from water, the temperature difference from the circulated antifeezing liquid becomes greater, thereby improving the heat exchanging efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a cold energy storage device that stores cold energy by freezing water.

(Prior Art) An example of a conventional cold energy storage device is shown in FIG. 3, in which a sealed heat storage tank 01 is filled with prine made of an aqueous solution of ethylene glycol or the like.

When the pressure tliI machine 02 is driven using nighttime electricity, etc., refrigerant gas such as fluorocarbons discharged from the compressor 02 enters the condenser 03, where it radiates heat to the outside air blown by the cooling fan 04 and condenses. liquefy. After this refrigerant liquid enters the expansion valve 05 and expands adiabatically, it enters the heat storage tank 01 and directly contacts the brine filled therein, cooling the brine and evaporating itself. Return to

As the brine is cooled, it freezes into a sherhet shape and gradually forms liquid ice from the top.

During the day when electricity demand is high, the brine extracted from the lower part of the heat storage tank 01 by the prine pump 06 is transferred to the heat exchanger 07.
The liquid ice in the M heat tank 01 is gradually thawed by cooling the water and refluxing it into the heated heat storage tank O1. The water cooled by the heat exchanger 07 is sent to a radiator 09 such as a fan coil by a water pump 08.
Here, the air is heated by exchanging heat with indoor air for cooling, and then is returned to the heat exchanger 07.

(Problems to be Solved by the Invention) In the above-mentioned conventional device, since the refrigerant flows through the liquid ice in the form of a liquid ice in the heat storage tank 01, the flow resistance of the refrigerant changes depending on the change in the layer thickness of the liquid ice. Therefore, not only is it necessary to control the refrigerator in accordance with the layer thickness of the liquid ice, but also the flow resistance of the brine changes, making it impossible to circulate it directly to the radiator. As a result, in addition to the refrigerant circulation circuit and the brine circulation circuit, a water circulation circuit consisting of a brine-water heat exchanger, a water pump, etc. must be provided, which makes the equipment complex and expensive. There was a problem.

(Means for Solving the Problems) The present invention was invented to solve the above problems, and its gist is that water is sealed in an antifreeze solution filled in a heat storage tank. A cold energy storage device characterized in that a container is suspended and an evaporator of a refrigerator is immersed in the antifreeze solution.

(Function) Since the present invention has the above configuration, the refrigerator is operated to cool the antifreeze liquid by its evaporator, and the water in the container is frozen through the antifreeze liquid, thereby generating cold energy in the heat storage tank. to store.

On the other hand, the cold energy stored in the heat storage tank is taken out by extracting antifreeze from the heat storage tank and supplying it to a user of the cold energy.

(Example) A first embodiment of the invention is shown in FIG.

In FIG. 1, reference numeral 1 denotes a heat storage tank, which is filled with an antifreeze solution consisting of an aqueous solution of ethylene glycol, calcium chloride, sodium chloride, and the like. In this antifreeze solution, a plurality of tubular containers 11 made of elastic materials such as plastic, rubber, and leather are filled with water and suspended from a frame 12 constructed above the heat storage tank 1 at a predetermined distance from each other. It is suspended by this. Also, there is an evaporator 1 at the top of the antifreeze.
0 is immersed, this evaporator 10, compressor n2, condenser 3,
A refrigerator is constructed by connecting the expansion valves 5 in this order through refrigerant piping. 6 is a brine pump for extracting antifreeze, and 9 is a radiator.

When the compressor 2 of the refrigerator is driven by electricity at night, refrigerant gas such as fluorocarbons discharged from the compressor a2 enters the condenser 3, where it radiates heat to the outside air blown by the cooling fan 4 and becomes an am liquefier. do.

This refrigerant liquid enters the expansion valve 5 and is adiabatically expanded in the stack generator 1.
By cooling the antifreeze liquid, it evaporates and becomes a refrigerant gas, which returns to the compressor 2.

When the antifreeze is cooled by the evaporator 10, only its temperature drops without freezing, and when the temperature drops below 0° C., the water in the container 11 begins to freeze.

At this time, since the evaporator IO is immersed above the antifreeze, the antifreeze cooled by the evaporator 10 passes through the gap in the container 11 and circulates in the heat storage tank 1 by convection. The water inside is efficiently cooled and all of it freezes, thus storing cold energy in the heat storage tank 1.

When extracting this cold energy, the brine pump 6 is operated. Then, antifreeze is extracted from the lower part of the heat storage tank 1 by the brine pump 6 and enters the heat radiation 2:9,
After radiating heat and increasing the temperature, it returns to the upper part of the heat storage tank 1. The ice in the container 11 is located at the top due to the difference in specific gravity with water, so there is a large temperature difference with the refluxing antifreeze, so the heat exchange efficiency is good, and the volume of the container 11 increases as the ice inside it thaws. Since the amount decreases by about 10%, the antifreeze in the heat storage tank l circulates smoothly.

Note that while the cold energy is being taken out, the refrigerator can be operated to replenish the cold energy in the heat storage tank 1, and the number of cold energy can be changed by changing the diameter of the container 11. Even if the capacity of the heat tank l is the same, the amount of heat storage can be freely changed. Furthermore, since the water is sealed in the container 11 made of an elastic material, it can easily follow volume changes due to freezing and thawing of the water.
By suspending the container 11 in antifreeze, the container 11
Since the pressure difference between the inside and outside of the container 11 can be made almost zero, the wall thickness of the container 11 can be reduced, and the heat transfer coefficient between the inside and outside can be improved. Furthermore, since the container 11 is suspended in the antifreeze, even if the water in the container 11 freezes, the flow of the refrigerant and antifreeze will not be hindered by ice, unlike in the conventional case, and the antifreeze will flow throughout the freezing and thawing of the ice. The area of the passage is almost constant, and the flow resistance is almost constant. Therefore, since antifreeze can be directly supplied to the radiator, a cold water circulation circuit can be omitted, and as a result, the device can be simplified and manufactured at low cost.

A second embodiment of the invention is shown in FIG.

The M heat tank 20 is open to the atmosphere, and a plurality of containers 21 made of bottomed tubular metal or plastics, etc., each having an open top are placed at a predetermined distance from each other into the antifreeze filled in the heat storage tank 20. The heat storage tank 20 is suspended from a frame 12 that is placed above the heat storage tank 20 at a distance therebetween.

Also, a partition wall 2 having vertical openings in the center of the heat storage tank 20 is provided.
A space 23 surrounded by 2 is provided, and an evaporator 24 of the refrigerator is disposed within this space 23. 25 is a cover made of a heat insulating material that also has a dustproof function.

The rest of the structure is the same as that of the first embodiment shown in FIG. 1, and corresponding members are given the same reference numerals.

However, if you operate the refrigerator using electricity at night,
The antifreeze is cooled by the evaporator 24.

The cooled antifreeze has a higher specific gravity, descends within the cavity 23, and exits from the opening at the bottom thereof. As a result, empty space 2
Since the antifreeze liquid outside 3 rises through the gap in the container 21 and flows into the cavity 23 from its upper opening, the temperature distribution of the antifreeze liquid in the tank 20 becomes high and low. Along with this, the water in the container 21 gradually freezes from below and becomes ice, and cold energy is stored in the heat storage tank 20.

To utilize this cold energy, the brine pump 6
As a result, the brine whose temperature is low in the lower part of the heat storage tank 20 is extracted, and after the temperature rises through the radiator 9, it flows back into the heat storage tank 20. The temperature distribution of antifreeze is high and low.

Thus, during cold storage and cold energy utilization, the temperature distribution of the antifreeze in the heat storage tank 20 is high and low, so that the inflow of thermal energy from the outside air from the upper part of the heat storage tank 20 is kept to a minimum.

In addition, since the container 21 is open at the top, water can be prevented from freezing.
There is no problem due to changes in volume due to thawing, and damage to the container 21 can be easily confirmed visually if the water level in the container 21 is set higher than the antifreeze liquid level as shown in the figure. . Furthermore, if the cross section of the container 21 is made flat, the heat transfer area can be expanded and the heat transfer efficiency can be improved.

In the above embodiments, cold energy is used for air conditioning, but it can of course be used for food storage, low-temperature cultivation, low-temperature aquaculture, etc.

(Effects of the Invention) In the present invention, a container filled with water in an antifreeze solution filled in a heat storage tank is suspended, and the evaporator of the refrigerator is immersed in the antifreeze solution, so that the water in the container cannot be frozen. This allows a large amount of cold energy to be stored in the heat storage tank, and furthermore, a constant flow area for the antifreeze can be ensured regardless of whether the water is frozen or thawed. Therefore,
Since the antifreeze flow resistance can be kept almost constant,
This not only eliminates the need to control the capacity of the refrigerator depending on the thickness of the ice layer as in the past, but also allows antifreeze to be supplied directly to the cooling energy user, simplifying the equipment and reducing manufacturing and operating costs. Reduced.

[Brief explanation of the drawing]

FIG. 1 is a diagrammatic system diagram showing the first embodiment of the present invention;
The figure is a diagrammatic system diagram showing a second embodiment of the present invention, and FIG. 3 is a diagrammatic system diagram of a conventional cold energy storage device. Heat storage tank 1120, container 11, 21, tea generator 40,
24Figure 3

Claims (1)

[Claims] A cold energy storage device characterized in that a container filled with water is suspended in an antifreeze solution filled in a heat storage tank, and an evaporator of a refrigerator is immersed in the antifreeze solution.