Refrigeration – Refrigeration producer – Sorbent type
Patent
1996-04-05
1999-03-16
Doerrler, William
Refrigeration
Refrigeration producer
Sorbent type
62482, F25B 1708, F25B 3504
Patent
active
058815732
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a refrigerating device including a housing unit and a cooling unit working intermittently, the cooling unit comprising an evaporator accommodated in the housing unit, a condenser and a reactor with a heatable sorber part filled with a substance capable of sorbing a working liquid at standard temperature and again releasing it upon heating, and wherein the evaporator, the condenser and the sorber part are mutually connected by a line and form a closed system.
Refrigerating units of the above kind are in particular used in small-size refrigerating devices and air coolers of air conditioning systems. In the sorber part the substance capable of sorption and enriched with a working liquid is heated and therein releases the absorbed liquid in form of vapor. The vapor condenses in the condenser and the condensed liquid collects in the evaporator arranged in the housing unit of the refrigerating device. When 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 creates low pressure in the line, which makes evaporate the liquid contained in the evaporator and, if applicable, makes it boil at low temperature. The evaporator therein withdraws heat from the environment in the housing unit and, therefore, can be used as cooling part. Such refrigerating devices are of simple construction and do not include movable parts. As substance capable of sorption e.g. a zeolite reacting with water in the above-described manner can be used. The water therein due to the low pressure will boil at few degrees and, if applicable, also in case of minus degrees in the evaporator. For refrigerating devices of this kind, however, also other sorption substances and liquids are suited, like e.g. salt and ammonia.
When expelling the liquid from the substance capable of sorption it is important that the substance is heated as uniformly as possible. This creates difficulties in particular then when heating is effected using a heat source--as is the case in refrigerating units--which is to be independent from the kind of heating (electric current, gas, dry fuel and the like). As the temperature of a flame is very high as compared to the amount of heat produced, it is important in a sorber part of the kind in discussion to transfer the heat to the substance capable of sorption such that local overheating is avoided. A further demand lies in that overheating of the sorber part should be avoided in the desorption phase because then the sorption activity of the sorber part will slowly calm down and thus cooling in the housing wall of the refrigerating device is reduced.
The invention, therefore, is based on the object of arranging and designing the reactor accommodating the sorber part in a refrigerating device of the generic kind such that the efficiency of the sorption and regeneration phases of the cooling unit is improved and safe functioning of the intermittent operation is guaranteed in spite of a simple construction and the use of different heating sources.
In accordance with this present invention, the reactor of the cooling unit is equipped with a second closed system filled with a working liquid, which system in the sorption phase of the refrigerating unit is controllable as cooling system for the sorber part and in the regeneration phase of the refrigerating unit--as heating system for the sorber part. Thus, two closed systems are provided for which in advantageous manner are connected in parallel to one another and are evacuated prior to being filled with working liquid. The first system essentially consists of the evaporator arranged in an insulation in the upper part of the housing unit of the refrigerating device and comprising a container for receiving the working liquid as well as a pipe protruding from the container in downward direction into the space to be cooled and an evaporator pipe connected subsequently thereto and reaching until above the level of working liquid in the con
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Doerrler William
Electrolux Leisure Appliances AB
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