Refrigeration – Refrigeration producer – Sorbent type
Patent
1998-02-17
1999-08-24
Doerrler, William
Refrigeration
Refrigeration producer
Sorbent type
62480, F25B 1500
Patent
active
059410930
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a sorption device as defined for use in a cooling system.
A sorption device of that kind is known from EP 0 590 443 A1. Using such sorption devices, heat can be transferred from a first heat carrier to a second heat carrier which is on higher temperature. Therein, a working substance is exothermally absorbed in a sorption agent and again is desorbed in an endothermic reaction. Thus it is possible to extract heat from a condensation evaporation part by cooling a heated heater absorber part down close to ambient temperature and by subsequent heating in excess of ambient temperature and to make use of said condensation evaporation part e.g. for cooling an air stream.
In the known sorption device, the housing enclosing the heater absorber parts comprises only one inlet and one outlet for the gaseous carrier medium which on its flow path extracts heat from as well as supplies heat to the heater absorber parts. The heat carrier medium--usually air--therein is guided through the housing in a direction opposite to the direction of rotation of the sorption containers and alternatingly flows along the heater absorber parts radially from outside to inside and from inside to outside. For guiding the heat carrier medium axially extending webs are provided for which reach up to the outer and inner orbit of the sorption containers and are mutually displaced on the inside and outside.
The known sorption means works with an efficiency very good for such devices, in particular when the sorption substances contained in the sorption containers consist of zeolite and water and the sorption containers, as provided for in the preferred embodiment of the known device, are formed as elongated flat hollow bodies and are bent in cross-section. When using zeolite for absorbing water no excessively high pressure is created in the sorption containers, permitting design of the sorption containers with comparatively large outer surfaces. If the sorption containers, however, contain ammonia changing from liquid into gaseous state of aggregation and vice versa, as well as one or several different salts absorbing the ammonia, then higher pressure exists in the sorption containers. The known sorption containers designed with a profile similar to a wing profile are not very well suitable for receiving higher pressures, since the surface is too large as compared to the cross-sectional area. Seen from the technical point of view, the use of a circular cross-section is best. Therein, few pipes having a larger diameter produce a better economical relation than many tubes with smaller diameter, as weight can be reduced. However, efficiency is more favorable when using many small tubes, so that an optimum has to be found for each individual case.
In the device cited in the beginning obligatorily a small gap exists between the webs and the outer and/or inner edge, respectively, of the sorption containers, through which gap a small portion of the heat carrier medium can move to the adjacent room instead of taking the provided path radially passing between the sorption containers. This short-cut flow can be neglected in the known device, as it is of no importance because of the plurality of sorption containers, in particular since the gap continually is covered by two sorption containers at least. If, however, fewer sorption containers are provided for with larger circumferential distance, in the known device a no longer negligible amount of heat carrier medium can pass through the webs and the margins of the sorption containers, this causing a noticeable worsening of efficiency.
In the known sorption device in addition the means for heating the gaseous heat carrier medium is built by a burner, preferably a gas burner, which is arranged in the housing enclosing the heater absorber parts. The combustion gases produced by the burner are admixed to the heat carrier medium and thus increase the volume thereof The amount of heat carrier medium introduced into the housing must be dimensioned correspondin
REFERENCES:
patent: 4169362 (1979-10-01), Weil et al.
patent: 4478057 (1984-10-01), Lotz
patent: 5279359 (1994-01-01), Erickson
patent: 5408847 (1995-04-01), Erickson
patent: 5503222 (1996-04-01), Dunne
Doerrler William
Electrolux Leisure Appliances AG
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