Refrigeration – Combined
Reexamination Certificate
2000-06-29
2001-08-21
Doerrler, William (Department: 3744)
Refrigeration
Combined
C062S497000
Reexamination Certificate
active
06276159
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to sorption systems wherein a sorbate is alternately adsorbed onto and desorbed from a sorbent. More particularly, the invention relates to an cooling appliance which incorporates a refrigeration sorption system wherein the sorbate is desorbed from the sorbent using electromagnetic waves.
In adsorption and absorption systems, which will be referred to herein as sorption systems, a first substance called a sorbate is alternately adsorbed (or absorbed) onto and then desorbed from a second substance called a sorbent. Specific sorbates and sorbents will usually be selected for a particular sorption system to produce a desired effect which is dependent on the affinity of the two substances. During an adsorption reaction, which is also referred to as the adsorb cycle or the adsorb portion of the sorption cycle, the sorbate is drawn onto and combines with the sorbate to produce a sorbate/sorbent complex, which will be referred to herein simply as a sorbate/sorbent compound. During the desorption reaction, which is also called the desorb cycle or the desorb portion of the sorption cycle, energy is supplied to the sorbate/sorbent compound to break the bonds between the sorbate and sorbent molecules and thereby desorb, or in other words separate or drive off, the sorbate from the sorbent. Substantial energy is imparted to the sorbate during the desorption reaction, and this energy can be harnessed for various uses.
An exemplary refrigeration sorption system may use a polar refrigerant, such as ammonia, as the sorbate and a metal halide salt, such as strontium bromide, as the sorbent. During the desorption reaction, which occurs in an enclosure called a sorber, the refrigerant molecules are driven off of the salt and into a relatively high pressure, high energy gaseous state. The refrigerant gas is subsequently condensed and then evaporated to produce a cooling effect. The evaporated refrigerant gas is then channeled back to the sorber, where it is once again adsorbed onto the salt in an adsorption reaction. The sorption cycle is repeated numerous times depending on the cooling requirements of the refrigeration system.
In certain prior art sorption systems, the desorption energy is supplied by a conventional heater. In such a system, a great deal of thermal energy is required to stochastically heat the sorbate/sorbent compound to the degree sufficient to break the bonds between the sorbate and sorbent molecules. As a result, the sorbate, sorbent and sorber are significantly heated, and substantial time and/or energy are required to remove this sensible heat and cool the sorber and sorbent before the next adsorption reaction can proceed.
In the refrigeration system described in the above-mentioned application, the desorption energy is supplied in the form of electromagnetic waves, such as radio frequency waves or microwaves, generated by, for example, a magnetron. Instead of heating the sorbate/sorbent compound, the electromagnetic waves selectively pump electrical energy into each sorbate-sorbent bond until the bond is broken and the sorbate molecule is separated from the sorbent molecule. Therefore, the sorbate, sorbent and sorber are not heated during the desorption reaction and consequently do not need to be cooled before the next adsorption reaction can proceed. As the desorption reaction is essentially isothermal, the overall performance of the refrigeration system is greatly improved.
SUMMARY OF THE INVENTION
According to the present invention, a cooling appliance is provided which comprises at least one sorber having a housing defining an enclosure, a sorbate/sorbent compound located within the enclosure, the sorber including a port through which a sorbate may be communicated into and out of the enclosure, and means for electrically coupling the sorber to an electromagnetic wave generator, wherein electromagnetic waves transmitted by the electromagnetic wave generator are propagated through the enclosure to desorb the sorbate from the sorbate/sorbent compound. The cooling appliance also includes a condenser connected to the port downstream of the sorber, an evaporator connected between the condenser and the port, and a controllable valve interposed between the condenser and the evaporator. In this manner, sorbate which is desorbed in the sorber is condensed in the condenser and then controllably released into the evaporator to create a cooling effect, after which the sorbate is drawn back into the sorber.
In another embodiment of the invention, the cooling appliance comprises two sorbers, valve means for respectively connecting the sorbers alternately with the condenser and the evaporator, and means for alternately coupling each sorber to the electromagnetic wave generator. In this manner, an adsorption reaction can occur in one sorber while a desorption reaction is occurring in the other sorber, and vice-versa, to produce a continuous cooling effect.
In another embodiment of the invention, a combination cooking and cooling appliance is provided by combining a microwave cooking appliance having a magnetron, a power circuit for controllably activating the magnetron, a cooking compartment and means for transmitting microwaves from the magnetron to the cooking compartment with a refrigeration sorption system comprising a sorber, a condenser connected to the sorber, an evaporator connected between the condenser and the sorber in close proximity with the cooking compartment, and a controllable valve interposed between the condenser and the evaporator. In this manner, microwaves generated by the magnetron can both cook an item of food located in the cooking compartment and desorb the sorbate from the sorbate/sorbent compound in the sorber. When cooling is required, the sorbate which is desorbed in the sorber is condensed in the condenser and then controllably released into the evaporator to create a cooling effect in the cooking chamber, after which the sorbate is drawn back into the sorber.
These and other objects and advantages of the present invention will be made apparent from the following detailed description, with reference to the accompanying drawings.
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Byrd Charles M.
Pfister Dennis M.
Conley Rose & Tayon PC
Doerrler William
Meyertons Eric B.
Sun Microsystems Inc.
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