The rising need for energy saving and pollution reduction attracts great attention to the problems of fuel consumption minimisation [1]. To solve this problem, efficient heat recuperation with advanced heat transfer equipment is essential. The Pillow-Plate Heat Exchangers (PPHEs) represent an innovative type of heat exchange equipment, with space-effective, light and pressure-resistant construction. Furthermore, they show intensified heat transfer characteristics while keeping pressure loss on the product media side low. Heat transfer is realized in channels with complex geometry, which are formed by spot-welding of two metal sheets, according to a particular welding spot pattern, and subsequent expansion by hydroforming. The distance between welded pillow plates, assembled in a single unit, can vary, thus enabling different cross-sectional areas for hot and cold media to be obtained. This feature makes PPHEs very useful for operations in which considerable difference between flow rates on the hot and cold side exists.
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