Heat exchange tube with heat absorptive shield

摘要

Method and apparatus for enhancing the heat transfer efficiency and lowering the temperature of tube walls used in a tubular gas to gas heat exchanger. The heat exchanger utilizes essentially flat sided tubes for the transfer of heat from hot gas flowing over the tubes to a cooler gas flowing therethrough. The apparatus of the invention includes a metallic heat shield inserted into the tubes between sides thereof to intercept radiation from the outer walls of said tubes and transfer it to the cooler gas flowing therethrough.