Patent ID: 6702006
Filing Date: 2004-03-09
Classification: F28D,F28F

Abstract:
A plate pack for a plate heat exchanger comprising a number of heat transfer plates (100), each plate having a heat transfer portion (C) and a number of through ports (110a-d, 120a-f), said plates (100) interacting in such manner, that a first flow duct is formed between the plates (100) in a plurality of first plate interspaces (250) and a second flow duct is formed between them in a plurality of second plate interspaces (250), and that the ports (110a-d, 120a-f) form at least one inlet duct and at least one outlet duct for each of the flow ducts, that the inlet duct of at least the first flow duct comprises at least one primary duct (230a-b; 330a-b; 630), which is arranged to receive a fluid flow for the first flow duct, and at least one secondary duct (240; 340; 640), which communicates via flow passage with the primary duct and the first flow duct and which is arranged to receive the fluid flow from the primary duct and to convey this fluid flow to the first flow duct,wherein the primary duct (230a-b; 330a-b; 630) and the secondary duct communicate with each other via at least one flow passage portion (231; 331; 631), which spans a plurality of plate interspaces (250), the extension of the flow passage portion (231; 331; 631) along the primary duct (230a-b; 330a-b; 630) is substantially smaller than the extension of the primary duct (230a-b; 330a-b; 630), and a flow passage between the primary and secondary ducts (230a-b, 240; 330a-b, 340; 630, 640) is substantially lacking outside said flow passage portion (231; 331; 631).