Refrigeration – Utilizing solar energy
Patent
1981-06-22
1984-09-11
King, Lloyd L.
Refrigeration
Utilizing solar energy
F25B 2700
Patent
active
044702680
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a continuously operable absorption refrigeration apparatus with an ejector, condenser, throttling element, evaporator and absorber or resorber, and also to a method of operating it and application of the absorption cooling apparatus.
STATE OF THE ART
Absorption refrigeration machines, in their numerous embodiments, have been known and technically developed for a long time, both for industrial installations and as household devices (see Rudolf Plank, "Handbuch der Kaltetechnik"[Handbook of Refrigeration Technology], Volume VII, and "Die Kaltemaschine"[Refrigeration Machines] by R. Plank and J. Kuprianoff).
In the earliest times, work was done on the development of absorption refrigeration machines for their employment as heat pumps, as is shown for example by the published new developments of the DFVLR (Deutsche Forschungs- und Versuchsanstalt fur Luft- und Raumfahrt [German Research and Experimental Institute for Air and Space Travel])--see "Oel- und Gasfeurung" [Oil and Gas Combustion], Vol. 12/1978.
This is concerned with a classic absorption refrigeration machine with fluid material pairs wherein the ejector (boiler) is fired directly from a gas or oil burner and the residual heat of the exhaust as well as the heat of the environment is conducted to the evaporator as secondary energy and is thus made useful.
Later, periodically operating absorption refrigeration machines became known, with solid absorption media, as for example iron chloride or calcium chloride and ammoniac or methylamin as absorbers, which could also be operated in a heat pump circuit.
In the technical realization of the described heat pump systems, difficulties arose in practice which among other things were caused, for example, by the high cost of the apparatus and its complicated manufacture, as well as due to the characteristics of the material systems, such as poor heat conductivity, unfavorable vapor pressure values, bulky sources and the source pressures connected therewith.
A further crucial disadvantage is the unfavorable suitability for volume fabrication of load units of kilowatt values.
Thus, for the elimination of these disadvantages, promising elements for heat storage were proposed, which operated according to the principle of the absorption refrigeration machine (Swiss Pat. No. 609,140). This is concerned with storage elements for an absorption heat storage system which comprises a solid material as an absorption medium and an accumulator for the absorbate driven out of the absorption medium. The absorption medium and the accumulator are arranged in a closed pipe-like housing and are separated from one another by an intermediate space.
Elements of this type have the advantage that they are well suited to rational quantity production as small production units that can be assembled according to need into larger capacity units. Storage elements of this type, connected and operated as absorption heat pumps, have the disadvantage that they allow only a discontinuous mode of operation.
DESCRIPTION OF THE INVENTION
The present invention has as its object to provide a continuously operable absorption refrigeration apparatus which does not have the described disadvantage of a discontinuous mode of operation and provides a refrigeration device of the most simple possible construction with all the advantages of a static refrigeration machine.
According to the invention, this objective is attained in that the ejector chamber is separated from the absorber or resorber chamber by a hygroscopic partition wall.
By "hygroscopic" is meant all of those materials and material systems which effect absorption of an organic or inorganic absorbate, wherein the vapor pressure of the material or material system noticeably departs from the saturation vapor pressure of the absorbate. (See in this connection O. Krischer, Trocknungstechnik [Drying Technique] 1978, page 54).
BRIEF DESCRIPTION OF THE DRAWINGS
The absorption refrigeration apparatus according to the invention and its employment are explained by way of e
REFERENCES:
patent: 4165952 (1979-08-01), Bennett
King Lloyd L.
Nilles James E.
Oertli AG Dubendorf
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