Refrigeration – Cooled enclosure – Portable receptacle
Patent
1997-05-13
1998-10-06
Doerrler, William
Refrigeration
Cooled enclosure
Portable receptacle
622351, 62236, 62480, F25B 2100, F25B 1708
Patent
active
058160698
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a sorption refrigerating unit, for a refrigerating box in particular, with a heatable sorber part filled with a substance capable of sorption and sorbing a liquid at standard temperature and again releasing it upon heating.
Such refrigerating units, used in small-size refrigerating apparatus and air coolers of air conditioning apparatus in particular, essentially consist of a sorber part, a condenser and a evaporizer connected to one another by means of a line and forming a closed system. In the sorber part, the substance capable of sorption and being enriched with liquid is heated and therein releases the sorbed liquid in form of vapor. The vapor condenses in the condenser and the condensed liquid accumulates in the evaporizer. If the heat source for the substance capable of sorption is switched off and the substance cools down, the material sucks in the moisture from the line saturated with vapor and therein produces low pressure in the line, causing the liquid in the evaporizer to evaporate and, if required, makes it boil at low temperature. The evaporizer therein withdraws heat from the environment and can be used as cooling member in a refrigerating box.
Refrigerating apparatus of the above-described kind are of simple construction and do not include moving components. As substance capable of sorption for example a zeolite reacting with water in the above-described way can be used. The water herein will boil in the evaporizer also in case of only few degrees or even at negative temperatures because of the low pressure. However, also other sorption substances and liquids are suitable for refrigerating units of this kind, like e.g. salt or ammonia.
When removing the liquid from the substance capable of sorption, it is important that the substance is heated as uniformly as possible. This causes some difficulty in particular in such cases, when heating is effected by a heat source which is to be independent from electrical current, as is the case in refrigerating units, e.g. during camping or on boats. Since the temperature of the flame is very high as compared to the temperature of the heat generated, the important point in a sorber part of the kind in question is that the heat is transferred to the substance capable of sorption such that no local overheating occurs.
Already, a sorption refrigerating unit of the generic kind has been proposed in which the sorber part has an essentially vertical opening of continuous tubular shape in longitudinal direction. The remaining internal space of the sorber part is closed on all sides and its interior is connected to a evaporizer part through a line. A heating element, a spirit burner in particular, is provided for below the tubular opening. After the regeneration phase in which the vapor is expelled from the zeolite under the effect of the heat source and was fed to the evaporizer/condenser through the connecting line, the sorber part is heated to such extent that it must be cooled down. As the sorber is equipped with a double-walled annular cylinder at the inside of the through-opening for the purpose of better heat transfer, which cylinder is partly filled with water evaporated during the regeneration phase, the following problem will arise during cooling down: if e.g. the sorber part is immersed into a cold water bath (e.g. water of a lake) water from the lake will be present in the tubular opening passing through the sorber part. If the lake water now cools down at the inside the double-walled cylinder partly filled with vapor, the vapor in the double-walled annular cylinder will condense at the cooled inner wall and flows down at the inner face. There the water accumulates and again is evaporated by the heated zeolite, the vapor again rising upwardly. This means that continuously vapor is present the in the upper portion of the double-walled annular cylinder and water continuously is present in the lower portion, so that a non-uniform cooling down of the zeolite contained in the sorber part takes place.
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Doerrler William
Electrolux Leisure Appliances AG
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