Absorption chiller and heat exchanger tube used the same

Details Absorption chiller and heat exchanger tube used the same Absorption chiller and heat exchanger tube used the same

1999-03-30

2000-08-08

Doerrler, William

Refrigeration

Refrigeration producer

Sorbent type

62485, 165133, 165179, F25B 1512, F25B 1500, F28F 142, F28F 1318

Patent

active

060984201

ABSTRACT:
An absorption chiller that uses an aqueous salt solution as an absorbent and water as a refrigerant, the absorption chiller including an evaporator that allows the water to trickle or flow downward onto the outer surface of a heat exchanger tube installed horizontally or approximately horizontally, an absorber that allows the aqueous salt solution to trickle or flow downward onto the outer surface of a heat exchanger tube installed horizontally or approximately horizontally, and a condenser that allows the water to be supplied onto the outer surface of a heat exchanger tube installed horizontally or approximately horizontally. At least one of the heat exchanger tubes is provided, on the inner surface thereof, with protruded threads formed in a spiral fashion. A plurality of rows of projections of a height of 0.2 to 0.4 mm with flat portions on the top is provided on the outer surface of the tube successively at a pitch of 0.4 to 0.8 mm between projections. The plurality of rows of projections is arranged in a spiral fashion in a direction opposite to that of the protruded threads and separated from each other at a pitch of 0.7 to 1.4 mm. Furthermore, the present invention provides the heat exchanger tube constructed in the forgoing manner.

REFERENCES:
patent: 3847212 (1974-11-01), Withers et al.
patent: 4660630 (1987-04-01), Cunningham et al.
patent: 5573062 (1996-11-01), Ooba et al.
patent: 5590711 (1997-01-01), Ishida et al.
patent: 5680772 (1997-10-01), Furukawa et al.
patent: 5690167 (1997-11-01), Rieger
Pending U.S. Patent Application No. 09/266,914 filed Mar. 12, 1999.

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