JPS58184475A - Cooling method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for cooling beverages in bottles, cans, and other types of food products that require or should be cooled.

The amount of heat required for a substance in a liquid phase to change to a gas phase is called heat of vaporization or heat of vaporization, and the heat of vaporization of various liquids is already well known.

And as is well known, when water evaporates 25
It absorbs 582.8 cal-71 of heat at ℃, which is much larger than other liquids, and the heat of vaporization changes little due to temperature differences. However, the heat of vaporization is the heat from the surrounding air when a liquid evaporates, and can be used for cooling.

In view of these points, the present invention provides a method of tightly enveloping an object to be cooled, such as a bottle or canned food product or beer, with a porous material such as cloth impregnated with an evaporative liquid such as water, which generates heat of vaporization. death,
This is inserted into a closed container, and the inside of the container is evacuated and the pressure is reduced to rapidly evaporate the liquid in the porous body.

To describe an embodiment of the present invention with reference to the drawings, reference numeral 1 denotes an object 9 to be cooled, for example a beer bottle, and the bottle is surrounded by a preferably thin porous sheet 2, such as a towel impregnated with water;
Open the lid 6a and put this into a sealed container=Ml.
4 is an electric vacuum pump such as a rotary pump, which evacuates the inside of the decompression chamber 6 having a predetermined volume determined according to the internal volume of the container 3, and operates the valve 5 between the container 5 and the chamber 6. By drawing the air in the container 3 by the vacuum chamber 6 and the continuously operating pump 4, the water impregnated into the porous sheet 2 is rapidly evaporated and the heat of vaporization is absorbed from the bottle and the surroundings, so that the object to be cooled is rapidly 1 is cooled.

The liquid to be impregnated into the porous sheet 2 is water;
When the temperature reaches 0℃ due to the heat of evaporation, the impregnated water turns into ice and almost no longer evaporates, and at the contact surface between sheet 2 and bottle 1, the melted portion of the impregnated water (ice) in sheet 2 evaporates due to the bottle 1 and its contents. Just do it.

Therefore, in order to cool the water to below 0°C, it is desirable to mix a preferably harmless anti-freezing agent such as alcohol, kerosene glycerin, or calcium chloride into the impregnated water in advance to bring the freezing temperature below 0°C. . For example, the relationship between the freezing temperature and the various mixing ratios of alcohol is shown in the table below, and cooling below 0°C is possible.

□ ゛ Mixing ratio 1/6 1/4 115
1 /2.4 1 /2 denatured alcohol -5-9,4-13,3-19,4-27,
8. Of course, the heat of vaporization of alcohol is lower than that of water, and the rate of vaporization is also faster than that of water. It is preferable to use a material that can absorb heat in a short period of time, such as a material with a thin shape or a material with a small heat capacity. Of course, during the process, the valve 5 is closed, air is introduced into the container 3 through the leak valve 7, the lid 3a is opened, and the separately prepared evaporation liquid is dripped or flowed down to impregnate the porous sheet 2, and then the porous sheet 2 is again impregnated. Cooling by evaporation of the exhaust gas may be repeated. :,.

The sheet 2 may be a band-like material wrapped around the outer periphery of the bottle 1, and is not limited to a sheet of cloth, but may also be made of a metal or plastic mesh or wool-like material, but If it is too thick, the surface layer may freeze, etc., and the frozen surface layer may obstruct the vaporization of the liquid impregnated on the side of the object to be cooled. Therefore, a relatively thin layer is preferable, and a net-shaped Things are good. Further, depending on the anti-icing agent to be mixed and used, the evaporated vapor is taken out from the pump 4, liquefied by the condenser 8, and stored in a desired storage container 9. Furthermore, in place of the water mixed with the above-mentioned antifreezing agent, ammonia or other refrigerant that is liquid at room temperature or below refrigerator temperature, and preferably has a large heat of vaporization even at below 0°C, may be used in consideration of safety. .

According to experiments, cover the jar with a towel and soak it with tap water,
When the pressure was reduced from 1 atm to about 16" mmHt within about 5 seconds using a vacuum chamber and a vacuum pump, about 50% or more of the water impregnated in the towel evaporated and solidified.

[Brief explanation of the drawing]

5- is a simplified block diagram of an embodiment implementing the method of the present invention. In the figure, 1 is an object to be cooled, 2 is a porous sheet, 3 is a closed container, 4 is a pump, and 5 is a valve. −6=

Claims (1)

[Claims] An object to be cooled, such as a bottle or canned food, is tightly wrapped with a multi-iL material such as cloth impregnated with a liquid having a high heat of vaporization, such as water, and this is inserted into a closed container, A cooling method characterized in that the airtight container is evacuated and depressurized.