JPH0438178Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an ice making heat storage device for air conditioning that stores a cold heat source for air conditioning in the form of latent heat of ice.

[Conventional technology]

The so-called ice storage method stores cold heat in the form of latent heat by storing ice in a heat storage water tank for air conditioning.Due to the difference in ice making methods, the form of ice stored is either solid (ice blocks) or liquid (fine ice). There is a state in which ice is suspended in water). While the solid type allows ice to adhere and grow on the surface of the heat transfer tube, the liquid type creates ice in the form of a sherbet. Both methods have their advantages and disadvantages, but the applicant has already proposed Japanese Patent Application No. 62-47770, Japanese Patent Application No. 62-62681,
In Japanese Patent Application No. 62-102994, Japanese Patent Application No. 62-228800, Japanese Patent Application No. 62-245930, etc., supercooled water cooled to below zero degrees Celsius is produced as a continuous flow, and this continuous flow of supercooled water is We have proposed an invention to produce liquid ice suitable for heat storage in which fine ice is dispersed by instantly releasing the supercooled state of ice.

JP-A-62-147271 teaches that supercooled water can be obtained by cooling while maintaining a fluid state so that the flow rate of water on the cooling heat transfer surface is higher than a predetermined value.

[Problem that the invention attempts to solve]

In the solid method, the area required for the heat transfer tube is large, and if ice forms on the surface of the heat transfer tube, ice has a low heat transfer rate, so the coefficient of performance of the refrigerator is low to allow further ice growth. becomes (usually 2 or less)
There is a problem.

On the other hand, in the liquid method, water is stored between microscopic ice cubes, so the amount of heat stored per unit volume is lower in the area where water is present, and even if as much water is removed as possible, that area will remain empty. Therefore, there is a problem that the amount of heat storage per unit volume is lower than that of the solid type.

The object of the present invention is to provide an ice making heat storage device that can compensate for the drawbacks of the solid method and the liquid method.

[Means to solve problems]

The gist of the present invention, which aims to achieve the above object, is to provide a heat storage water tank for storing heat source water for air conditioning;
A water cooler installed outside the heat storage water tank, which continuously passes water through the heat transfer tubes to continuously extract supercooled water below zero degrees Celsius from the heat transfer tubes. An air conditioner consisting of a cooler, a water supply path that leads a portion of the heat source water in the heat storage water tank to the water cooler, and a return path that leads supercooled water continuously produced in the water cooler to the heat storage water tank. The ice making heat storage device is characterized in that an ice making device is installed below the water surface in the heat storage water tank, the ice making device having a plate-shaped heat transfer plate attached to a refrigerant pipe through which a refrigerant passes.

In other words, supercooled water is continuously produced by a water cooler outside the tank and is sent to the heat storage tank, and an ice maker with a large heat transfer surface is installed inside the heat storage tank. Solid ice is continuously grown on the surface of the ice maker from supercooled water that is fed into the ice maker.

The present invention will be explained in detail below with reference to the embodiments shown in the drawings.

〔Example〕

FIG. 1 shows an overall equipment layout diagram showing an embodiment of the device of the present invention, in which 1 represents a heat storage water tank, 2 represents a group of heat exchangers that handle the air conditioning load, and a circulating pump 3 The heat source water in the heat storage water tank 1 is circulated to the heat exchanger group 2 for heating and cooling. In the device of the present invention, ice is made during cooling operation during the cooling season of a building or when cooling operation is stopped at night and is stored in the heat storage water tank 1 in preparation for daytime cooling operation. The device of the present invention is an improvement on this method of making ice, and its feature is that it can make solid ice from supercooled water.

In FIG. 1, 4 indicates a water cooler. This water cooler 4 has a water inlet side header section 8 and a cooling chamber 9 by dividing the inside of the shell 5 with partition plates 6 and 7.
A large number of heat exchanger tubes 11 with open ends are passed through the partition plates 6 and 7 so that one end is opened to the water inlet side header part 8 and the other end is opened to the outside of the shell, and the substantially The cooling chamber 9 is installed so that its length can fit inside the cooling chamber 9. In this example, the cooling chamber 9 functions as an evaporator of the refrigeration cycle, and each heat transfer tube 11 is heated by evaporating and expanding the refrigerant here.
is cooled from the outside. The refrigeration cycle includes a cooling chamber 9 functioning as an evaporator, a compressor 14, a condenser 15, an expansion valve 16, and refrigerant piping. The present inventors proposed in Japanese Patent Application No. 62-271922 that the temperature of the tube wall in contact with water of the heat transfer tube is -5.8℃.
As long as the temperature is controlled so that it does not fall below (but below zero degrees Celsius), supercooled water will continue to flow regardless of the Reynolds number of the water flow (that is, the flow velocity and pipe diameter), the water temperature before cooling, the water temperature after cooling, etc. However, this is also utilized in the device of the present invention, and a part of the water in the heat storage water tank 1 is transferred to the water supply path 12.
The evaporation and expansion pressure of the refrigerant is adjusted so that the inner wall temperature of the heat transfer tube 11 does not fall below -5.8°C (however, below zero degrees Celsius). heat tube 11
By continuously cooling the water within, it can be withdrawn as a continuous stream of supercooled water.
This supercooled water is returned to the heat storage water tank 1 via a path 13.

On the other hand, in the device of the present invention, there is an ice maker 1 in the heat storage water tank 1.
8 will be installed. As shown in FIG. 2, this ice maker 18 may have a simple structure in which a metal flat plate 21 is attached to a refrigerant pipe 20.
As shown in FIG. 1, this flat ice maker 18 is
A large number of flat plates 21 are arranged parallel to each other at predetermined intervals below the water surface of the heat storage water tank 1, and each ice maker 1
The refrigerant is passed through the refrigerant pipe 20 of 8. The refrigerant of this ice maker 18 can be used in common with the water cooler 4 for producing supercooled water. In this case, the liquid refrigerant condensed in the condenser 15 is passed through the expansion valve 22 or The refrigerant piping may be arranged such that the refrigerant is squeezed through a pillar reach tube, supplied to the refrigerant pipe 20, evaporated there, and returned to the compressor 14. In particular, it is easiest to construct each flat ice maker 18 as a direct expansion type heat exchanger.

When operating this device to make ice, the ice maker 18 is first operated to form ice on the surface of the flat plate 21, and then the water cooler 4 is operated to continuously produce supercooled water and send it to the heat storage water tank 1. . First, when the ice maker 18 is operated in the absence of supercooled water, thin ice forms uniformly on the surface of the flat plate 21. In other words, ice has a high thermal resistance, so it does not grow much in the thickness direction.
Due to heat transfer through the metal of the flat plate 21, the entire surface of the flat plate becomes below zero degrees Celsius, and ice forms on the entire surface. Next, when the supercooled water produced in the water cooler 4 is sent in, the supercooled water undergoes a phase change due to the ice formed on the surface of the ice maker 18, and becomes dense ice on top of it, forming new ice. form a surface. Therefore, if supercooled water is continuously fed, more and more ice will be formed on the flat plate of the ice maker 18, and the layer thickness will become infinitely thick. In this case, the ice can only be grown from supercooled water, and the ice maker 18 itself does not need to have a cooling capacity that contributes to ice growth. In other words, when making solid ice in the heat storage water tank 1, instead of supplying the cold heat necessary to form an ice layer from the inside of the ice, ice is grown on the ice surface from supercooled water supplied to the surroundings. The basic feature of the device of the present invention is that ice is generated newly and continuously, and the water cooler 4 is responsible for supplying cold heat for making ice.

In addition, in the above embodiment, the cooling chamber 9 of the water cooler 4
In the above example, the refrigerant pipe 20 of the ice maker 18 functions as the evaporator of the refrigeration cycle, but the cooling chamber 9 and the refrigerant pipe 20 are supplied with brine produced by a refrigerator, and the heat transfer tube 11 and the flat plate 21 are It may also be cooled.

[Effect of idea]

According to the present invention, solid ice can be produced in a heat storage water tank with a high coefficient of performance of the refrigeration system. That is, in the present invention, the growth of ice on the surface of the ice maker 18 is caused by the phase change of supercooled water, and the ice maker 18 itself does not take charge of the cooling heat for growing ice. Therefore, as in the method of growing ice by supplying cold heat for ice generation to the ice maker 18, a situation where the ice itself becomes a heat insulating layer and inhibits the growth of ice (in this case, the ice is grown (which would lead to a very low coefficient of performance of the refrigeration system) is avoided, while the continuous production of supercooled water by the water cooler 4 can be carried out with a high coefficient of performance. Therefore, the power cost for producing ice becomes extremely low. Further, according to the present invention, ice is stored in the heat storage water tank 1 as a dense solid ice, so a large amount of cold energy can be stored in the tank where the ice filling rate per unit volume increases. Furthermore, in the device of the present invention, the ice maker 18 is mostly made of a simple metal plate, and has the advantage that the device structure is simple and can be manufactured at low cost, and has great practical value as an ice making heat storage device for air conditioning.

[Brief explanation of the drawing]

FIG. 1 is an equipment layout system diagram showing one embodiment of the apparatus of the present invention, and FIG. 2 is a perspective view showing an example of the ice maker according to the present invention. 1... Heat storage water tank, 2... Heat exchanger group that handles air conditioning load, 3... Circulation pump, 4... Water cooler, 9...
...Cooling room, 11...Heat transfer tube, 12...Water supply route,
13...Return route, 18...Ice maker, 20...Refrigerant pipe, 21...Metal flat plate.

Claims (1)

[Scope of utility model registration request] A heat storage water tank that stores heat source water for air conditioning, and a water cooler installed outside the heat storage water tank, which transfers supercooled water below zero degrees Celsius by continuously passing water through heat transfer tubes. A water cooler that continuously takes out the water from the heat pipe, a water supply path that leads a part of the heat source water in the heat storage water tank to the water cooler, and a water cooler that takes out the supercooled water that is continuously produced in the water cooler. In an air-conditioning ice making heat storage device comprising a return path leading to a heat storage water tank, an ice maker comprising a plate-shaped heat transfer plate attached to a refrigerant pipe through which a refrigerant passes is installed below the water surface in the heat storage water tank. Ice making heat storage device for air conditioning.