Refrigeration – Processes – Gas and liquid contact
Patent
1990-04-25
1990-12-18
Davis, Jr., Albert W.
Refrigeration
Processes
Gas and liquid contact
62304, 62316, 165 54, F25D 700
Patent
active
049777530
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE ART
The present invention relates to methods for air cooling with the use of heat-exchangers of the indirect-evaporative type and can find most utility when applied for air cooling in those premises or accomodations which must be isolated from the surrounding atmosphere either for technological reasons or on account of labour protection conditions, etc.
PRIOR ART
In heat-exchangers of the aforesaid type heat is withdrawn from a gas stream called the main stream through a partition wall to a liquid which is evaporation-cooled in another gas stream called the auxiliary stream. The evaporation-cooled liquid is located on the partition wall either as a fine film or in a capillary-porous material covering the surface of the partition wall. The partition-wall surfaces establish ducts or passages along which flow the gas being cooled as the main stream,on one side, and the cooling gas as the auxiliary stream, on the other side. The duct along which the main stream flows is termed the dry dust since it is formed by moisture-proof walls, and the duct along which the auxiliarg stream flows is called the moist duct since it is formed by the moist walls, i.e., those covered with a fine film of liquid or a wettable capillary porous material.
The base method for indirect-evaporative cooling consists in that the gas being cooled is passed along the dry duct in contact with the heat-transfer surface separating the walls, while the cooling gas is passed counter-currently along the moist duct, in the stream of which the liquid vaporizes from the moist wall of the same partition wall, whereby said ducts are in heat-exchange relation.
One state-of-the-art method for indirect-evaporative gas cooling (U.S. application Ser. No. 979,796) is known to consist in that air is cooled by passing its main stream along a dry duct, simultaneously passing the auxiliary air stream counter-currently along a moist duct which is in heat-exchange relation with said dry duct.
More specifically, the auxiliary air stream is obtained by subdividing the total stream into the main and auxiliary streams, the latter stream being directed into the moist duct countercurrently with respect to the main stream.
However, the known method suffers from a number of limitations. A substantial limiation consists in that the methxod fails to provide air cooling by its recirculation; this results in higher power consumption and in pollution of the main stream with the surrounding air in cases where it is impermissible by, e.g., the labour protection conditions.
One more limitation of the known method consists in too low moisture evaporation in the moist duct, which affects adversely the cooling efficiency.
DISCLOSURE OF THE INVENTION
The object of the invention is to provide a method for indirect-evaporative gas cooling, wherein higher cooling efficiency would be attained due to increased masstransfer in the moist duct for the auxiliary air stream.
The object of the invention is accomplished due to the fact that in a method for indirect-evaporative air cooling, consisting in that air is cooled by passing its main stream along a dry duct and simultaneously passing an auxiliary air stream in a countercurrent flow along a moist duct which is in heat-exchange relation with said dry duct, according to the invention, the auxiliary air stream is precooled by being passed along another dry duct which is in heat-exchange relation with another moist duct along which is passed counter currently a part of the precooled air taken up from the main stream, flowing of the auxiliary air stream being effected by sucking it out of the moist duct.
Thanks to the fact that the auxiliary air stream is precooled and is set in motion by its being sucked out of the moist duct here is provided the cooling of the main air stream down to the dew point of the surrounding air.
SUMMARY OF THE DRAWING
In what follows the invention will become more obvious by way of illustration of a specific exemplary embodiment thereof with reference to the accompanying drawing, wherein a d
REFERENCES:
patent: 1986529 (1935-01-01), Ray
patent: 2990696 (1961-07-01), Fisher
patent: 4002040 (1977-01-01), Munters et al.
patent: 4137058 (1979-01-01), Schlom et al.
patent: 4380910 (1983-04-01), Hood et al.
Gershuni Alexandr N.
Maisotsenko Valery S.
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