JP3160338B2 - Super cooling water production equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing supercooled water for producing ice for ice storage.

[0002]

2. Description of the Related Art For example, in a supercooled water producing apparatus for producing ice for ice heat storage, as shown in the conventional system diagram of FIG.
The refrigerant enters the condenser 3 through the refrigerant pipe 2, is cooled and condensed and liquefied by the cooling water flowing in the heat transfer pipe 4, and the refrigerant liquid is reduced in pressure through the refrigerant liquid pipe 5 and the refrigerant liquid flow controller 6. Thereafter, it flows into the evaporator 7. This low-temperature low-pressure refrigerant liquid 8
Evaporates by removing heat from the cold water flowing in the evaporator heat transfer pipe 9, becomes a low-pressure refrigerant gas, and is sucked into the compressor 1 again through the refrigerant gas pipe 10. The cold water flowing into the inlet side water chamber 21 is cooled by the refrigerant 8 on the outer surface of the heat transfer tube 9 while flowing through the heat transfer tube 9, and flows out to the outlet side water chamber 22. Reference numeral 11 denotes a driving device for the compressor.

[0003]

In this type of supercooled water producing apparatus, in order to cool the chilled water flowing through the evaporator heat transfer tube 9 by evaporating the refrigerant liquid 8, the evaporation temperature is set to approximately 3 by the chilled water outlet temperature. -5 ° C lower. On the other hand, the freezing temperature of water is 0 ° C.
The heat transfer tube 9 may not only be closed by the ice but also may be ruptured due to volume expansion of the ice. Therefore, in the supercooled water producing apparatus, the cold water outlet temperature is 5 ° C. in order to prevent the cold water from freezing.
As described above, since the evaporating temperature is limited to 0 to -1 ° C or higher, as a result, the chilled water in the heat transfer tube is cooled to a chilled water outlet temperature of 3 ° C or lower even if more careful measures are taken. This is not possible in the past.

[0004] The present invention has been proposed in view of such circumstances, and provides a supercooled water producing apparatus capable of stably and continuously producing supercooled water having a temperature lower than the freezing point of water. With the goal.

[0005]

For this purpose, the present invention relates to an evaporator in which a plurality of parallel heat transfer tubes are inserted into a refrigeration cycle system and a refrigerant from a condenser flows on an outer surface thereof, and chilled water to be supercooled flows on an inner surface thereof. In the apparatus for supercooling the cold water with a vessel, the heat transfer tube has an inner diameter of 4 to 10 mm.
Chilled water at a cold water inlet temperature of + 0.1 ° C. or higher and a cold water outlet temperature of −2.5 ° C. or higher and a Reynolds number Re = 200
It is characterized by comprising an evaporator flowing in the range of 0 to 8000, and a filter for cold water which is provided in front of the evaporator and has a filtration capacity of 100 μm or less (preferably 90 μm or less ) .

[0006]

According to the above construction, the cold water (supercooled water) flowing in the heat transfer tube is continuously produced as supercooled water below the freezing point of water (0 ° C.) without being frozen. Can be.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, one embodiment of the present invention will be described. FIG. 1 is a longitudinal sectional view of an evaporator, and the entire circuit system of the refrigerant is substantially the same as that of FIG. The difference from the vessel lies in the shape of the heat transfer tube and the operating conditions.

That is, in FIG. 1, the shape and operating conditions of the heat transfer tube 9a are selected within the following ranges, and an outside-tube refrigerant evaporation type evaporator in which cold water flows inside the tube and refrigerant flows outside the tube. That is, the inner diameter of the heat transfer tube 9a: 4 to 10 mm Surface roughness of the inner surface of the heat transfer tube 9a: 15 μm or less Reynolds number of cold water flowing through the heat transfer tube 9a: Re = 2,0
00 to 8,000 Inlet temperature of cold water: 0.1 ° C or more Outlet temperature of cold water (supercooled water): -2.5 ° C or more 100 μm or less (preferably 90 μm or less) on the cold water inlet side
Filter below) provided, using a fine or water removal comparable garbage removing dust in cold water.

According to such an evaporator, the following effects can be obtained. (1) A relatively small-diameter heat transfer tube having an inner diameter of 4 to 10 mm,
Flow cold water with a filter on which dust that causes ice nuclei is removed to a size of 100 μm or less on a heat transfer surface with an inner surface roughness of 15 μm or less at an inlet temperature of 0.1 ° C. or more and an outlet temperature of −2.5 ° C. or more. The cooling water can be supercooled while suppressing the generation of ice. (2) The cooling water speed at that time is Re = 2,000 to
By selecting a value within the range of 8,000, heat conversion efficiency can be increased in the range of turbulence and supercooling of a large amount of cold water becomes possible. (3) In this embodiment, inexpensive brine can be used as the refrigerant, which is economical and has the effect of not causing the problem of ozone layer destruction due to chlorofluorocarbon. (4) The present invention is applicable not only to supercooled water but also to the production of low-temperature water such as 3 to 0 ° C., and can be used for ice making other than ice heat storage or plant cooling.

[0010]

In summary, according to the present invention, an evaporator which is inserted into a refrigeration cycle system and comprises a plurality of parallel heat transfer tubes, through which the refrigerant from the condenser flows on the outer surface, and the cold water to be supercooled flows on the inner surface. In the apparatus for supercooling the chilled water, the chilled water is fed to the chilled water inlet temperature + 0.1 ° C. or higher and the chilled water outlet temperature −2 to the heat transfer tube having an inner diameter of 4 to 10 mm and an roughness of 14 μm or less as the heat transfer tube. Reynolds number Re = 2000 at 0.5 ° C or more
An evaporator flowing in the range of 8000,
By providing a cold water filter having a filtration capacity of 100 μm or less, it is possible to obtain a supercooled water production apparatus capable of stably and continuously producing supercooled water having a temperature lower than the freezing point of water. The invention is of great industrial value.

[Brief description of the drawings]

FIG. 1 is an overall system diagram of a supercooled water production system of the present invention.

FIG. 2 is an overall system diagram showing a conventional supercooled water production system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Refrigerant pipe 3 Condenser pipe 4 Heat transfer pipe 5 Refrigerant liquid pipe 6 Flow control device 7a Evaporator 8 Refrigerant liquid 9a Evaporator heat transfer pipe 10 Gas pipe 11 Compressor drive 21 Inlet side water chamber 22 Outlet side water chamber

Continuation of the front page (56) References JP-A-5-118726 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F25D 11/00 102

Claims (2)

(57) [Claims] 1. An evaporator which is inserted into a refrigeration cycle system and comprises a plurality of parallel heat transfer tubes, in which a refrigerant from a condenser flows on an outer surface thereof and in which a chilled water to be supercooled flows on an inner surface thereof, the above cold water is supercooled. The heat transfer tube has an inner diameter of 4 to 10 mm and a roughness of 14 μm.
m to the heat transfer tube with an inner surface of less than
An evaporator flowing at a temperature of 0.1 ° C. or higher and a cold water outlet temperature of −2.5 ° C. or higher and in a range of Reynolds number Re = 2000 to 8000, and cold water in front of the evaporator and having a filtration capacity of 100 μm or less A supercooled water producing apparatus, comprising: 2. An apparatus for producing supercooled water, wherein brine is flown as a refrigerant over the outer surface of the heat transfer tube.