Refrigeration – Processes – Circulating external gas
Patent
1989-09-20
1991-08-20
Bennett, Henry A.
Refrigeration
Processes
Circulating external gas
62271, F25D 1706
Patent
active
050403753
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION History of the Related Art
Conventional sorption dehumidifiers are usually regenerated in a so-called open system, i.e. the regenerating air is taken from surrounding outside air and returned to the surroundings after it has passed a sorption mass and has driven the moisture out of it.
It is often a disadvantage to need duct connection to the surroundings, and a so-called closed regeneration system is then selected, in which, after the air through the sorption mass, the regenerating air is allowed to pass a cooler or condenser, in which this air is cooled so that the absorbed moisture is dispelled before the air is taken back to the sorption mass via a heater, wherein the temperature of the regenerating air is raised to drive the moisture out of the mass. In its turn the condenser is then cooled by a secondary air stream from the dehumidified enclosure which is then in turn supplied with the heat taken from the regenerating air.
This process is also has disadvantages. One such disadvantage is that the energy requirements compared with the open system will be higher. In addition the amount of heat which is supplied to the dehumidified enclosure via the secondary air through the condenser gives the enclosure a temperature increase, which can be troublesome. In certain cases when the dehumidified enclosure, and thus also the cooling air supplied to the condenser, has a temperature lying below 0.degree. C. there is a risk that the condensate will freeze in the condensor, so that it will become blocked and no longer function.
SUMMARY OF THE INVENTION
The object of the present invention is to remove the above-mentioned disadvantages, by lowering the energy requirement considerably, by reducing the amount of heat transferred from the condensor to the dehumidified enclosure and by allowing condensation to take place at a temperature independent of the temperature in the dehumidified enclosure, this temperature being sufficiently high for preventing the condensate from freezing.
This object is achieved in accordance with the invention by the method and apparatus having been given the distinguishing features disclosed in the accompanying claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail in connection with an embodiment example illustrated on the drawing, where
FIG. 1 schematically illustrates an embodiment of an apparatus for carrying out a method in accordance with the invention.
FIG. 2 illustrates in a psychrometric chart a dehumidifying and regenerating sequence in the method according to the invention.
FIG. 3 is another dehumidifying and regenerating sequence which can be carried out with the method and apparatus according to the invention.
FIG. 4 is a perspective view of a method of arranging dehumidifying components in the sequence according to FIG. 3.
DESCRIPTION OF THE PREFERRED EMBODIMENT
It is assumed in the following that the gas which is to be treated in accordance with the invention is air which is to be dried (dehumidified) and also that the regenerating gas is air, although the invention is not restricted in these respects.
FIG. 1 solely illustrates the parts of the apparatus which are vital for explaining the invention, while other parts such as casings, fans etc. are excluded. The sorption apparatus as illustrated in FIG. 1 is thus illustrated as essentially including a regenerative drying rotor containing a mass having the ability to absorb moisture. The rotor can be implemented conventionally, and comprise such as alternatingly flat and corrugated layers of suitable material, e.g. glass fibre "paper" with hygroscopic additives. The layers are reeled one upon one another to form a large number of axial ducts which are open towards the end surfaces of the rotor. A recovery apparatus 12 is also illustrated in FIG. 1, and this apparatus can either be a temperature or a moisture exchanger. This recovery apparatus is not necessary for the function of the regeneration sequence, but lowers the energy requirements considerably
REFERENCES:
patent: 4474021 (1984-10-01), Harband
Patent Abstract of Japan, vol. 7, No. 37, M-193, JP 57-188948, published 1982.
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