DE649610C - Device for cooling with solid carbonic acid - Google Patents

Description

Device for cooling with solid carbon dioxide For all refrigerators, In cold stores, cold boxes, etc., the refrigeration requirement changes continuously, once as a result of fluctuations in the outside temperature, which change the heat loss and on the other hand because of the irregular use of the cooling devices by the User. When using solid carbon dioxide as a cold generator, although by attaching a fixed or variable insulating layer between the refrigerant and solid carbonic acid the heat transfer to an approximately constant level bring. But this in no way means that the temperature in the refrigerator compartment will Heat transfer remains the same accordingly. Will not be for a while; warm chilled goods entered, the cold room temperature sinks low, and the lower, the more the cold room is better insulated from the outside. If vice versa the refrigerator or If the refrigerator compartment is loaded with more warm items or opened more frequently, @ remains the average refrigerator compartment temperature is higher than desired for a longer period of time. Every Unevenness in the use of the refrigerator and every change in the outside temperature This also results in fluctuations in the temperature in the cold store.

This phenomenon is essentially due to the fact that with the temperature change of the air in the cold room also the temperature of the heat exchange surface alternates between the refrigerator compartment and the container for solid carbon dioxide. The appearance must so disappear if without prejudice to the degree of stress on the refrigerator and the heat exchange surface between the cold room air regardless of the outside temperature and container for solid carbon dioxide, i.e. the outer surface of the container, on the same Temperature level is maintained. This object is with the subject of the invention solved.

There are devices for cooling with solid carbon dioxide are known at which in a container between its walls and the solid carbonic acid a water-soaked layer of fibrous material is arranged, the water content of which is frozen by the evaporating solid carbonic acid.

It is also known, such a water-soaked fiber layer to use as a cladding of a container for solid carbon dioxide and to use the container to be placed between the items to be cooled.

A device is also known in which solid carbonic acid is produced a heat exchanger is placed, which is at a distance from the surface of a Water bowl is arranged.

It is also known to use cloth bags wetted with water for transport of solid To use carbon dioxide, in which the water becomes a gastight layer freezes.

The simultaneous use of solid carbon dioxide and water ice has also been suggested for cows young by railroad cars. Thereby the fixed Carbon dioxide placed in pockets, some of which are covered with \ @ assereis on the outside are.

The arrangement of a water jacket between the cold source and the cold room, which is frozen by the cold source and serves as a cold store, is also known.

With all these devices, however, the effect is not achieved that without prejudice to the stress on the refrigerator compartment and any change in the Outside temperature the heat exchange surface maintains approximately the same temperature.

According to the invention the intended for cooling the cold room is fixed Carbonic acid is surrounded by a water armor, which is the walls of the container forms for the solid carbonic acid. This ice armor is so dimensioned in its strength that its heat transfer at medium stress on the cold room of the heat absorption maintains balance on its outer surface. Then prevails on the outside of the Ice armor always approximates a temperature of -f- o ° C. The cold room under greater stress, a surface layer of the ice armor thaws, and the The heat of melting of this layer of ice is added to the heat of passage to form solid carbonic acid. Conversely, if the cold room is used very little, the outer surface dries of the ice sheet, and moisture condenses on it from the cold room air, which freezes again and again and increases the strength of the ice armor. The ones for freezing The cold required by the layers of precipitation cannot therefore lower the Lead cooling duct temperature. The temperature remains on the outer surface of the ice sheet from -f- o ° C permanently very approximately constant.

In the drawing, the invention is shown in two figures. Fig. I shows a refrigerator a, in the ceiling of which the container b for solid carbon dioxide is used. A lid c closes this container. Inside the refrigerator is the container b is surrounded by the insulation d. On the surface of this insulation the ice sheet is frozen. The ice armor can be wetted by water spray nozzles f will.

A cold room is shown in Fig. A. Above go transversely or lengthways metal pipes b through the room, which have insulation e . These tubes b are intended to receive solid carbon dioxide and are closed at the ends by insulating plugs g or opened for charging with solid carbon dioxide. t; In the insulation e, an ice sheet d is also frozen here, which can be wetted by the water spray nozzles f. Below the ice sheet condensation gutters h in bekännter manner and down overflow pipes arranged i.

The ice shell can be frozen with a foreign source of cold and then remains permanently in when the device is loaded with solid carbonic acid of varying strength. But it is of course also possible to use the ice armor Freeze in place with dry ice using the water spray nozzles. Suitable anchors can also be frozen to safely carry the ice armor.

The insulation between the solid carbonation container and the Ice armor can also be omitted. The big compared to insulating materials Thermal conductivity of ice then causes the ice armor to become very strong and a Compared to the container, very large surface for heat exchange with the cold room air receives. You can use the container for the solid carbon dioxide after the ice shell has frozen from this puddle out again and into the resulting cavity the solid carbonic acid insert immediately.

Such ice armor with carbonic acid ice filling can be used individually or too several housed in a refrigerator or refrigerator or refrigerator compartment that with or without artificially moving air a uniform temperature distribution is achieved.

Contact thermometers can be placed in the cells or chambers for the solid carbon dioxide or thermostats are housed, through which it is indicated in time, when the solid carbon dioxide is used up.

It is possible to freeze one or more pipe coils in the ice armor, through which liquids, gases or vapors are sent for the purpose of cooling will. The closer such a snake lies to the dry ice chamber in the ice armor, the deeper the flow medium is cooled, because the ice sheet is from the inside is continuously supercooled to the outside by the solid carbon dioxide.

So that the cold carried by the carbonic acid vapors can also be used make, a pipe snake is expediently frozen in the ice armor, the one Connection between the refrigerator and the carbonic acid ice comb or between the latter and the insulation or the outside air.

The technical progress of the subject matter of the invention persists in that automatically only consumed so much solid carbon dioxide how to generate and maintain the desired temperature in the cold room is required, and that the heat exchange surface does not have the temperature of -I- o ° C can not exceed and almost not fall below.

Claims (1)

PATENT CLAIMS: - i. A device for cooling with solid carbonic acid, which is housed in an externally insulated container made of highly thermally conductive metal, characterized in that the container receives a frozen water layer on its insulation outside, which can be wetted by water spray nozzles arranged in its vicinity - and its strength together with the thickness of the insulation of the container, is dimensioned so that its surface continuously has approximately the melting temperature of the water ice. a. Device for cooling with solid carbonic acid according to Claim i, characterized in that pipes are passed through the ice shell for the removal of the carbonic acid vapors from the dry ice container.