Heatcraft Inc.

Luvata Grenada LLC

Paul L Mitchell

Roger A Loomis

Robert T Stewart

David E Lollar

Michael E Haidenreich

James R Harris

David L Davis

A header ( ) for a heat exchanger ( ). The header ( ) has an outer elongate member ( ) with a curved section that has a plurality of ferrules ( ) projecting inwardly. An inner elongate member ( ) is adapted to mate with the outer elongate member ( ). The inner elongate member ( ) has first and second ends ( ) and a plurality of teeth ( ) proximate at least one of the first and second ends ( ). The teeth ( ) at least partially cooperate with the ferrules ( ) when the outer elongate member ( ) engages the inner elongate member ( ). A heat exchanger ( ) incorporating the two-piece headers ( ) is also disclosed.

Two-piece header and heat exchanger incorporating same

A sheet of fin stock is lubricated by a roller coater having first and second lubricant-applying rollers adapted to engage respective opposed first and second sides of the sheet and to apply a first synthetic lubricant to both sides of the sheet as the sheet is pulled through the roller coater. The lubricated sheet is then formed into a plurality of coil fins by a conventional fin press. The first synthetic lubricant is devoid of petroleum ingredients and is water soluble. The first synthetic lubricant forms a hydrophilic coating on the fins. The fins are assembled with a plurality of hairpin tubes to form the coil. A second synthetic lubricant is introduced into each of the tubes prior to bending. The amount of the first synthetic lubricant applied to the fin sheet and the amount of second synthetic lubricant introduced into each hairpin tube are carefully controlled so that neither the first nor the second synthetic lubricant need be removed during the coil manufacturing process, thereby eliminating the need for a dedicated cleaning/degreasing operation. The first synthetic lubricant has a relatively low volatility so that a special emissions permit is not required and has relatively low BOD, FOG and COD levels so that a special water permit is not required.

Method for manufacturing a heat transfer coil

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Scobey, MS, United States of America

Paul L Mitchell