JPH05106873A - Device for ice-based heat storage - Google Patents

Abstract

PURPOSE:To reduce icing at the part relieved from supercooling. CONSTITUTION:A cooling heat exchanger 12 is made to cool air to a lower temperature than that of a cold heat-storing material W. The cooling heat exchanger is connected to a nozzle 13 and air is supplied. An orifice 18 is provided in a return pipe 4B. Cooled air is ejected into the supercooled cold heat-storing material. The cooled air ejected causes a mechanical impact and a temperature impact to relieve the cold heat-storing material W from a supercooled state. Therefore, icing occurs at a place at some distance from the nozzle 13 and icing on the nozzle 13 is reduced. Air is ejected at a velocity greater than what is enough to blow away generated ice as it approaches the orifice 18. It becomes impossible for generated ice to stop up the orifice 18.

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 for eliminating a supercooling state in the middle of a pipeline, and more particularly to measures against ice accretion in a supercooling eliminating section.

[0002]

2. Description of the Related Art A heat storage air-conditioning system has a dynamic system in which ice is used to store cold heat and ice is generated without adhering the ice to the cooling surface. One of the dynamic systems is a supercooling control type ice heat storage device. This ice heat storage device circulates the cool storage material between a cooler and an ice storage tank, and cools the cool storage material cooled by the cooler. The cooled state is eliminated and slurry ice is generated.

A structure for eliminating the supercooled state is, for example,
As disclosed in Japanese Unexamined Patent Publication No. 63-217171, a gutter-shaped fluid passage is provided on an ice storage tank opened upward, and a cold storage material is circulated through the circulation passage in the fluid passage. ,
After supercooling during distribution, impact the regenerator material near the outlet,
In some cases, this causes the supercooled state to be eliminated, ice is deposited, and the ice is allowed to flow into the ice storage tank.

In the supercooling control type ice heat storage device, the supercooling state is unstable and icing starts even with a slight stimulus. The regenerator material is supercooled outside the circulation path to further eliminate the supercooled state. Therefore, the subcooling elimination portion and the heat exchanger are arranged close to the ice storage tank.

[0005]

However, in the above device, since the supercooled state is eliminated after the circulation path is exited, the installation position of the subcooling elimination section or the heat exchanger is limited to the vicinity of the ice storage tank. Therefore, there is a problem that the degree of freedom in design is small.

Therefore, it is conceivable to try to eliminate the supercooled state in the middle of the circulation path to generate ice and send the cold storage material to the ice storage tank while keeping it in a fluid state. As a means to eliminate the supercooled state, when the cooling surface having a temperature lower than that of the supercooled regenerator material is subjected to temperature shock and the supercooled state is eliminated, the generated ice easily adheres to the cooling surface. However, there is a problem that when this ice accretion grows, the pipe is blocked, and further the freezing progresses to the upstream side to freeze the subcooling heat exchanger.

The present invention has been made in view of the above points, and an object thereof is to reduce ice accretion on the supercooling elimination portion.

[0008]

Means for Solving the Problems To achieve the above object, the means of the invention according to claim 1 is to provide a jetting portion as supercooling eliminating means, and the cool storage supercooled by the jetting portion. The supercooled state is eliminated by jetting the cooled gas into the material.

Specifically, the means taken by the invention according to claim 1 is, as shown in FIG. 1, an ice storage tank (2) for storing a cold storage material (W) which is frozen into a slurry. And a cooling means (3) for supercooling the regenerator material (W), and a supercooling elimination part (10) for eliminating a supercooled state of the supercooled regenerator material (W). It is premised on the ice heat storage device in which the cold storage material (W) is connected in a circulatory manner according to (4).

Specifically, as shown in FIG.
The supercooling elimination section (10) sucks gas and
A gas cooling means (12) for cooling to a lower temperature than the supercooled regenerator material (W) is provided.

Further, when connected to the gas cooling means (12), it is provided in the circulation path (4) on the downstream side of the cooling means (3) and ejects cooling gas to the regenerator material (W). The part (13) is provided.

The means taken by the invention according to claim 2 is to collect and reuse a fluid. Specifically, as shown in FIGS. 3 and 4, in the ice heat storage device, The subcooling elimination section (10) is provided in the circulation path (4) on the downstream side of the cooling means (3) and ejects a fluid that is hardly soluble in the cold storage material (W) into the cold storage material (W). Spouting part (1
3) is provided.

Further, a recovery section (1) provided downstream of the ejection section (13) for recovering the fluid from the cold storage material (W).
6) is provided.

In addition, the start end is connected to the recovery part (16) and the end end is connected to the jet part (13) to cool the fluid separated from the regenerator material (W) and to blow the jet part ( 1
By-pass means (17) that circulates in 3) is provided.

Furthermore, a fluid cooling means (12) interposed in the bypass means (17) for cooling the fluid to a temperature higher than the freezing point and lower than the cold storage material (W) in a supercooled state is provided. There is.

[0016]

With the above structure, according to the invention of claim 1, the cold storage material (W) is circulated between the ice storage tank (2) and the cooling means (3), and the circulation path (4) is provided. The cooling means (3) is cooling the regenerator material (W) on the way.

On the other hand, the ejection part (13) ejects a gas having a temperature lower than that of the regenerator material (W) into the supercooled regenerator material (W) by the gas cooling means (12). The jetted cooling gas gives a mechanical shock and a temperature shock to the regenerator material (W), thereby eliminating the supercooled state of the regenerator material (W). Therefore, the freezing material (W) is not iced directly at the ejection portion (13) but is distant, and the amount of ice adhering to the ejection portion (13) is reduced. Further, since the cooling gas gives not only a mechanical shock but also a temperature shock to the regenerator material (W), the supercooled state can be reliably eliminated.

According to the invention of claim 2, the collecting section (1
6) collects a low-temperature fluid from the regenerator material (W), sends the collected fluid to the fluid cooling means (12) through the bypass means (17) and cools the cooling fluid, and the cooling fluid is ejected ( It is returned to 13) and reused.

[0019]

As described above, according to the first aspect of the invention, by ejecting the cooling gas from the ejection portion (13), the supercooled state can be surely eliminated, while the ejection portion ( The icing can be performed at a place apart from 13), and the icing on the ejection part (13) can be reduced.
Therefore, the pipe line can be prevented from being blocked, and further, the supercooling generation heat exchanger can be prevented from freezing, and the ice making operation can be stably performed. As a result, the subcooling elimination unit (1
0) and the degree of freedom in designing the heat exchanger are increased. For example, in the heat storage air conditioning system, the subcooling generation heat exchanger (3), the jet part (13), and the like are placed on the roof, and the ice storage tank (2 ) Can be installed in the basement.

According to the invention of claim 2, a low temperature fluid can be recovered and reused by the bypass means (17), heat loss can be reduced, and an ice heat storage device having high thermal efficiency can be provided. can do.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show a first embodiment of the invention according to claim 1. As shown in FIG. 1, the ice heat storage device (1)
Is an ice storage tank (2) for storing a cold storage material (W) that has been iced in a slurry form, the ice storage tank (2), and a supercooling generation heat exchanger (3) as cooling means. And the supercooling elimination unit (1
0) are sequentially connected by the circulation path (4).
The circulation path (4) includes a forward path (4A) from the ice storage tank (2) to the supercooling generation heat exchanger (3), and the subcooling generation heat exchanger (3) to the supercooling elimination section. It is composed of a return pipe (4B) that passes through (10) to the ice storage tank (2), and a pump (5) interposed in the outward pipe (4A) is used to generate a subcooling heat exchanger ( Cool storage material (W) between 3) and the ice storage tank (2)
Is forced to circulate.

As a cooling system of the heat exchanger (3) for generating subcooling, a direct expansion type in which the cold storage material (W) is directly cooled by a refrigerant, or a cold storage material (W) by cooled brine is used.
It may be any of indirect expansion type that indirectly cools. Water or an aqueous solution is used as the cold storage material (W).

Next, as shown in FIG. 2, the subcooling elimination section (10) is characterized by the present invention by a fluid pump (11).
And a cooling heat exchanger (12) as a gas cooling means,
The spouting part (13) which becomes the supercooling elimination part (10) is sequentially connected via an air pipe (14), and this air pipe (1)
The starting end of 4) is open to the outside air, and the fluid pump (11)
The air drawn in from the start end by the heat exchanger (1
After 2), it is ejected from the ejection part (13).

The cooling heat exchanger (12) is configured to cool the air to a temperature lower than that of the regenerator material (W), and when the temperature of the cooling air is not significantly different from the regenerator material temperature, it is supercooled. The same system as the cooling pipe arranged in the heat exchanger for generation (3) can be used.

The jet portion (13) has a nozzle-shaped jet port (1
8) is provided in the return conduit (4B). Spout (1
The jet velocity from 8) is set to a velocity having a mechanical impact force to the extent that the supercooled state of the regenerator material (W) is eliminated. Air is constantly ejected from the spout (18),
The jetted air becomes bubbles and mixes in the cold storage material (W). As a material of the ejection portion (13), a material having a small thermal conductivity or a nonpolar material such as a fluorine resin is used in order to suppress the adhesion of ice to the outer surface.

Next, the operation of the ice heat storage device will be described.

The cold storage material (W) is circulated between the ice storage tank (2) and the cooling means (3), and the cooling means (3) cools the cold storage material (W) in the middle of the circulation path (4). is doing.

On the other hand, the ejection part (13) ejects air bubbles of a temperature lower than that of the regenerator material (W) supercooled by the cooling heat exchanger (12) into the supercooled regenerator material (W). To do. These bubbles give a mechanical shock to the cold storage material (W) at the time of ejection, and give a thermal shock to the cold storage material (W) at the surface of the bubbles having a temperature lower than that of the cold storage material (W) while flowing to the downstream side. The cold storage material (W) is not only subjected to mechanical shock but also to temperature shock, so that the supercooled state is surely resolved and icing starts. In this way, the icing of the regenerator material (W) is performed by the ejected cooling air and is not directly performed on the outer surface of the ejection portion (13) which becomes the supercooling elimination portion (10), so that the ejection portion (13) The amount of ice that adheres is reduced.

The cold storage material (W) which has started to be frozen flows through the return conduit (4B) while maintaining the state in which slurry ice is mixed, and is returned to the ice storage tank (2).

As described above, by jetting the cooling air from the jet portion (13), the supercooled state can be surely eliminated, while the icing can be performed at a place away from the jet portion (13). It is possible to reduce ice accretion on the ejection portion (13). Therefore, it is possible to prevent the blockage of the pipe line and further prevent the heat exchanger (3) for supercooling generation from freezing, so that the ice making operation can be stably performed. As a result, the degree of freedom in equipment design of the subcooling elimination unit (10) and the heat exchanger is increased, and for example, in the heat storage air conditioning system, the subcooling generation heat exchanger (3), the jet unit (13), and the like are provided. On the rooftop, the ice storage tank (2) can be installed in the basement.

Next, FIG. 3 shows a second embodiment of the invention according to claim 2. In this embodiment, air as a cooling medium is circulated and used in the supercooling elimination section (10).

Specifically, in addition to the jetting section (13) and the cooling heat exchanger (12) as a gas cooling means, a recovery section (16) is provided downstream of the jetting section (13). ,
It is connected to the bypass means by (17).

The bypass means (17) has a starting end connected to the recovery section (16) and a terminal end connected to the jetting section (13), and has a cooling heat exchanger (12) and a fluid pump (B) between both ends. 11) is connected and is configured to cool the air separated from the regenerator material (W) and supply it to the jetting section (13).

The recovery unit (16) is configured such that the upper portion of the ice storage tank (2) is closed and air bubbles are stored in the ice storage tank (2), and the cooling air atmosphere to be stored is bypassed. The starting end of the means (17) is open. Other configurations are the above first
It is similar to the embodiment.

According to this embodiment, the air jetted into the regenerator material (W) flows through the return conduit (4B) and the recovery section (1).
6), is sucked by the bypass means (17) by the rotation of the fluid pump (11), and is further cooled by the heat exchanger (1).
It is sent to 2) and cooled, and the cooling air is returned to the ejection part (13) and reused.

As a result, low temperature air can be recovered and reused by the bypass means (17), and heat loss can be reduced.

Next, FIGS. 4 and 5 show a third embodiment of the invention according to claim 2. In this embodiment, the collecting unit (16)
Is connected to the return conduit (4B) instead of the ice storage tank (2).

Specifically, as the recovery section (16), a gas-liquid separator (16a) is provided in the return conduit (4B) on the downstream side of the ejection section (13), and this gas-liquid separator (16a) is provided. The start end of the bypass means (17) is connected to. This gas-liquid separator (16a) has a main body (20) as shown in FIG.
The upstream return conduit (4B) is connected to the side wall of the above, and the downstream return conduit (4B) is connected to the lower part thereof, while the bypass means (17) is opened to the upper air atmosphere. A static mixer (25) is accommodated in the main body (22), and the static mixer (25) rotates by the force of the inflowing regenerator material (W) to start icing in the gas-liquid separator (16a). The stored cold storage material (W) is prevented from freezing. Further, the bypass means (17) is provided with a dryer (26) for removing the mist-like regenerator material (W) floating in the air.

According to this embodiment, the air jetted into the regenerator material (W) is recovered by the gas-liquid separator (16a) located in the middle of the return conduit (4B), so the bypass means (1)
The length of the pipe from the start end of 7) to the fluid pump (11) can be shortened, and the temperature rise of the cooling air and the heat insulating pipe cost of the bypass means (17) can be reduced.

Next, a fourth embodiment of the invention according to claim 2 will be described. In this embodiment, a liquid is used instead of the air used in the second and third embodiments.

In this case, since the low temperature medium is changed to a liquid, the fluid pump (1
While using a liquid pump as 1), bypass means (1
The starting end of 7) is opened in the liquid layer of the ice storage tank (2). Further, in the ice heat storage device of the third embodiment, the fluid pump (11)
A liquid pump is used as a gas-liquid separator (16
By replacing a) with an oil separator (19), bypass means (17)
Open the beginning of the to the liquid layer in the oil separator. Further, as the fluid cooling means, the cooling heat exchanger (1
2) is used. Other configurations are similar to those of the second and third embodiments.

The properties of the liquid are that it is lower than the freezing point of the regenerator material (W) in order to maintain a liquid state that can be ejected after cooling, and it is difficult to dissolve in the regenerator material (W) to facilitate separation. It must be soluble, and more preferably insoluble. Further, it is necessary to have safety in consideration of the case where the liquid leaks to the outside. Examples of such liquid include oil.

According to this embodiment, by using a liquid having a density higher than that of air as the cooling medium, the mass flow rate of the cooling medium jetted from the fluid jet portion (13) is larger than that of air even if the flow velocity is the same as that of air. Since it is large and therefore the amount of cold heat supplied into the pipe is also large, both mechanical shock and temperature shock can be increased, and a more reliable elimination of the supercooled state can be achieved.

The ejection of the fluid from the ejection portion (13) may be performed intermittently. In this case,
It is necessary to measure in advance the optimum switching time between fluid ejection and stop.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a schematic configuration of an ice heat storage device according to claims 1 and 2.

FIG. 2 shows a first embodiment of the invention according to claim 1, and is a main part enlarged part of a supercooling elimination part.

FIG. 3 shows a second embodiment of the invention according to claim 2, and is a main part enlarged part of the supercooling elimination part.

FIG. 4 shows a third embodiment of the invention according to claim 2, and is a main portion enlarged portion of the supercooling elimination portion.

FIG. 5 is a sectional view showing a gas-liquid separator according to a third embodiment of the invention according to claim 2;

[Explanation of symbols]

 2 Ice storage tank 3 Heat exchanger for supercooling generation (cooling means) 4 Circulation path 10 Supercooling elimination section 12 Heat exchanger for cooling (gas cooling means, fluid cooling means) 13 Spouting section 16 Recovery section 16a Gas-liquid separator (Collection part) 17 Bypass means

Claims (2)

[Claims] 1. An ice storage tank (2) for storing a cold storage material (W) that is sicified into a slurry, a cooling means (3) for supercooling the cold storage material (W), and a supercooling An ice heat storage device in which a supercooling elimination section (10) for eliminating a supercooled state of the stored cold storage material (W) is sequentially connected by a circulation path (4) so that the cold storage material (W) can circulate. The subcooling elimination section (10) is connected to the gas cooling means (12) for sucking gas and cooling the gas to a temperature lower than that of the cool storage material (W) in the supercooled state. An ice heat storage device, characterized by comprising a jetting portion (13) provided in a circulation path (4) on the downstream side of the cooling means (3) and jetting a cooling gas to the cold storage material (W). 2. An ice storage tank (2) for storing a cold storage material (W) which is sicified into a slurry, a cooling means (3) for supercooling the cold storage material (W), and a supercooling An ice heat storage device in which a supercooling elimination section (10) for eliminating a supercooled state of the stored cold storage material (W) is sequentially connected by a circulation path (4) so that the cold storage material (W) can circulate. The subcooling elimination section (10) is provided in the circulation path (4) on the downstream side of the cooling means (3), and stores a fluid that is hardly soluble in the cold storage material (W) in the cold storage material (W). A jet portion (13) for jetting, and a cool storage material (W) provided downstream of the jet portion (13)
A recovery part (16) for recovering the fluid from the cooling device, and a start end connected to the recovery part (16) and a termination end connected to the ejection part (13) to cool the fluid separated from the regenerator material (W). By-pass means (17) flowing through the jetting part (13), and a fluid interposed in the bypass means (17) for cooling the fluid to a temperature higher than the freezing point and lower than the cool storage material (W) in a supercooled state. An ice heat storage device comprising: a cooling means (12).