JPH04190028A - Ice heat accumulation device - Google Patents

Abstract

PURPOSE:To improve an efficiency of freezer device and to prevent occurrence of corrosive gas and variation in physical characteristic of refrigerant itself by a method wherein a specified cooling refrigerant is stored in an ice storing tank of an ice heat storing tank at a bottom part of the ice heat storing tank at a temperature lower than a specified temperature and this cooling medium is dispersed from an upper part within the ice heat storing tank, circulated within an ice heat storing tank and then ices are crystallized. CONSTITUTION:Medium 3 with its specific weight of 1.5 times or more than that of ice, solidification point of -20 deg.C or less and non-soluble against water is stored at a bottom part 2 of an ice heat storing tank 1 at a temperature of 0 deg.C or less. This cooling medium 3 is dispersed by a pipe 6 from an upper part 7 of the ice heat storing tank. Due to this fact, the medium may perform well a heat exchanging operation with water 8 within the ice heat storing tank 1, resulting in that some sherbet-like ice particles 9 are crystallized. The heat exchanged cooling medium 3 drops into the water while agitating the water 8 and is collected at a bottom part 2 of the ice heat storing tank 1. Then, the dispersing cooling medium is not directly brought into contact with the water 8, so that it does not freeze the upper part 7 of the pipe 6. In addition, the cooling medium 3 can be fed directlyl into a freezer 4, so that an efficiency of the ice heat storing device can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to an ice heat storage device used for air conditioning and the like.

(Conventional technology) Air conditioning systems with ice thermal storage devices use cheap late-night electricity to reduce the load on heat source equipment, in order to reduce the demand for electricity for cooling, which is concentrated during the day. It has applications in relatively large capacity air conditioning systems.

There are two methods for producing ice in this ice heat storage device: indirect heat exchange method and direct heat exchange method.

The indirect heat exchange method has an ice-making heat transfer tube inside the ice heat storage tank.
This method circulates a low-temperature cooling medium inside or outside of the heat exchanger tube to generate ice on the outside or inside of the heat exchanger tube.

The indirect heat exchange method uses antifreeze such as ethylene glycol or Freon as a cooling medium to generate ice on the outside or inside of the heat transfer tube, and the thickness of the ice increases as ice is formed on the walls of the heat transfer tube. However, since the thermal conductivity of the ice itself is low, the heat transfer from the cooling medium to the ice is reduced, which slows down the ice formation rate and reduces the efficiency of the refrigerator that cools the cooling medium. are doing.

Furthermore, when heat transfer tubes are placed in an ice heat storage tank, ice is generated on the outside of the heat transfer tubes, and the number of heat transfer tubes is increased to improve the efficiency of the ice heat storage tank. The ice filling rate will decrease accordingly.

On the other hand, if you reduce the number of heat transfer tubes and increase the thickness of the ice on the heat transfer tubes, not only will the rate of ice formation slow down, but when the ice melts, there will be parts of the heat transfer tubes that are easy to melt, causing ice to form. The efficiency decreases due to unevenness, and when ice forms on the heat exchanger tube again, it starts from the iced part, so the thicker part becomes even thicker, and eventually the ice comes into contact with the heat exchanger tube, causing the ice to form. Accidents such as bending or damage may occur.

On the other hand, the direct heat exchange method generates ice by directly circulating a low-temperature cooling medium into the ice storage tank.Since water and ice are generated in the ice storage tank, the efficiency of the refrigerator is improved. However, since the cooling medium gas enters the ice, phenomena such as water and cooling medium gas reacting to generate corrosive gas or changing the physical properties of the cooling medium itself occur.

(Problems to be solved by the invention) In the indirect heat exchange method, the efficiency of the refrigerator decreases due to the slow ice generation rate, and the efficiency of the refrigerator decreases due to unevenness of ice in the icing area and damage to heat transfer tubes. There are problems like this.

Further, in the direct heat exchange method, there arise problems such as water and cooling medium gas reacting to generate corrosive gas or changing the physical properties of the cooling medium itself.

The present invention has been made in view of the above problems, and aims to improve the efficiency of refrigerators and to provide an ice heat storage tank that does not generate corrosive gas and does not change the physical properties of the refrigerant itself.

[Structure of the invention]

(Means for solving problems) In order to achieve the above object, the present invention has the following features.

In the water storage tank of the ice heat storage tank, a cooling medium with a specific weight of 1.5 times or more that of ice, a freezing point of 120 degrees Celsius or less, and a water-insoluble cooling medium is placed at 0 degrees Celsius.
Below, ice is stored at the bottom of the ice heat storage tank, and this cooling medium is distributed from the top of the ice heat storage tank and circulated within the ice heat storage tank to precipitate ice.

(Function) To explain the cooling medium, particularly Fluorinert liquid, as an example, Fluorinert liquid is a colorless, transparent, odorless, and inert liquid, and has a completely fluorinated structure.
It is a bond between a carbon atom C and a fluorine atom F, and its boiling point and freezing point differ depending on the number of bonds, but most have a freezing point below -20°C.

Its specific weight is more than 1.7 times that of ice at around 0°C, and about twice that of ice, and its solubility in water is 7.
Since the amount is quite low at 2 ppm, even if it is mixed with water, it will completely separate and the Fluorinert solution will precipitate and the water will float.

Utilizing the characteristics of this cooling medium (Florinat liquid), the cooling medium is stored at the bottom of the ice storage tank, cooled directly or indirectly by a refrigerator, and then sprayed from the top of the ice storage tank. The water in the ice heat storage tank is turned into sherbet-like ice, and the water around 0°C is stored in the ice heat storage tank.

(Embodiment) FIG. 1 shows the main structure of an embodiment of the ice heat storage device of the present invention, in which a cooling medium 3 (Florinat liquid) is stored in the bottom 2 of the ice heat storage tank 1, and a pump 4 ．． When sprayed from the upper part 7 of the ice heat storage tank via the refrigerator 5 and pipe 6, the heavy cooling medium exchanges heat with the water 8 in the ice heat storage tank 1, converting some of it into ice 9, and returns the heavy cooling medium to the ice heat storage tank 1. Return to photography department 2.

The water 8 in the ice heat storage tank 1 undergoes heat exchange and part of it becomes ice 9, but since the ice is lighter than the water 8, it floats above the ice heat storage tank 1, and the cooling medium 3, which is even heavier than water, flows into the ice heat storage tank. It settles on the bottom 2 of 1.

In order to disperse the cooling medium, it exchanges heat well with the water 8, and sherbet-like ice particles 9 are precipitated, and the heat exchanged cooling medium 3 becomes water 8.
While stirring, the ice falls through the water and collects at the bottom 2 of the ice heat storage tank 1.

Since the cooling medium to be sprayed is not in direct contact with the water 8,
The upper part 7 of the pipe 6 is not frozen.

Moreover, since the cooling medium 3 can be directly introduced into the refrigerator 4, the efficiency of the ice heat storage device is improved.

Since the cooling medium to be sprayed is not in direct contact with the water 8,
A safe and highly efficient ice heat storage device can be provided without freezing the upper part 7 of the pipe 6.

In addition, in order to disperse the cooling medium, the ice heat storage tank IFF is used to exchange heat well with water 8 and to precipitate sherbet-like ice particles 9.
(water filling efficiency) can be increased.

Furthermore, since the cooling medium 3 can be directly introduced into the refrigerator 4, the efficiency of the ice heat storage device is improved.

FIG. 2 shows a main part configuration of an ice heat storage device according to another embodiment of the present invention. A heat exchanger 10 may be installed at the bottom 2 of the ice heat storage tank 1.

〔Effect of the invention〕

As described above, according to the present invention, the cooling medium to be sprayed does not come into direct contact with the water in the heat storage tank and does not freeze the pipes, and the cooling medium can be directly introduced into the refrigerator, resulting in safe and efficient operation. A high ice heat storage device can be provided.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of the main parts of an embodiment of the ice heat storage device of the present invention,
FIG. 2 is a block diagram of main parts showing another embodiment of the present invention. 1...Ice heat storage tank 3...Cooling medium 5...
・Freezer 6...Piping 8...Water
9...Ice Grain Agent Patent Attorney Noriyuki Chika Figure 1 Figure 2

Claims (1)

[Claims] A cooling medium (for example, Fluorinert liquid) that is insoluble in water and has a specific weight of at least 1.5 times that of ice and a freezing point of -20°C or lower is added to the water tank of the ice thermal storage tank at a temperature of 0°C or lower. An ice heat storage device that stores ice at the bottom, and deposits ice by distributing this cooling medium from the top of the ice heat storage tank and circulating it within the ice heat storage tank.