American Standard International Inc.

American Standard Inc.

The Trane Company

Louis J Mougin

Floyd C Hayes

Ralph L Webb

The present invention provides an improved heat transfer surface. The improved heat transfer comprises: a surface covered with fin convolutions. The fin convolutions have fin tips extending from the surface. The fin tips have a first plurality of notches and a second plurality of notches wherein the first notches and the second notches are of different sizes.

Nucleate boiling surface

An internally enhanced heat transfer tube comprising a heat transfer tube including an internal surface and an internal diameter (D); a plurality of roughness elements on the internal surface of the heat transfer tube, each roughness element having a height (e) above the internal surface where the ratio of the height (e) to the internal diameter (D) falls within the range 0.004.ltoreq.e/D.ltoreq.0.045.

Internally enhanced heat transfer tube

Apparatus and method are disclosed for absorbing a subject vapor in an absorbent liquid wherein an additive is provided which exists in at least a vapor phase concurrently with the subject vapor, which additive is effective to reduce the surface tension of the absorbent liquid upon contact therewith. A heat transfer member is provided having a first surface over which absorbent liquid is passed such that a film is formed thereon, and a second surface over which a heat transfer fluid is passed in order to remove heat from the absorption process. Means are provided associated with the first surface of the heat transfer member for promoting interfacial turbulence between the film of absorbent liquid and the subject vapor such that a series of preferential absorption sites is established along the first surface. In a preferred embodiment, the last-named means comprise a plurality of protuberances extending outwardly from the first surface and spaced from one another so as to define a two dimensional arrangement of protuberances along the first surface. As one example of the application of the invention, a lithium bromide absorption refrigeration system is disclosed wherein the absorber thereof is designed in accordance with the present invention.

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La Crosse, WI, United States of America

Louis J Mougin