Heat Transfer Coefficients in Glass Exchangers by A. S. Foust and T. J. Thompson, presented at the 1940 meeting of the American Institute of Chemical Engineers and published by the University of Michigan’s Department of Engineering Research, provides a detailed study on heat transfer in double-pipe heat exchangers with inner pipes made of PYREX glass. The research aims to enhance the understanding of the behavior of glass exchangers, particularly for corrosive materials and dehumidification tasks. The study examines heat transfer coefficients under various conditions, including non-boiling, condensing steam, and dehumidification of wet air. The results indicate that non-boiling coefficients can be computed using the Dittus-Boelter equation with adjusted numerical coefficients for the annulus film. The paper highlights the higher thermal conductivity of PYREX glass compared to previously published values and explores the resistance contributions of the gas film, condensate, and glass. The study offers practical insights for designing and optimizing double-pipe exchangers, emphasizing the high potential for dehumidification and the impact of cooling water velocity on heat transfer rates. The authors acknowledge the support from Corning Glass Works and the collaborative efforts within the University of Michigan’s Engineering Research Department.