COBEM99

SR27 Transferência de Calor e Massa

Title:

A NUMERICAL PROCEDURE FOR TUBE COUNT DETERMINATION IN TUBULAR HEAT EXCHANGERS

Summary :

THE DEVELOPMENT OF A COMPUTATIONAL PROCEDURE THAT ALLOWS THE PRECISE DETERMINATION OF IMPORTANT THERMAL AND MECHANICAL DESIGN PARAMETERS OF TUBULAR HEAT EXCHANGERS, SUCH AS THE TUBE COUNT AND THE TUBE BUNDLE OUTSIDE DIAMETER, IS DISCUSSED IN THE PRESENT WORK. EQUIPMENTS FOR INDUSTRIAL APPLICATIONS ARE USUALLY DESIGNED USING EMPIRICAL EXPRESSIONS AND DATA TABLES FOR DETERMINATION OF THE TUBE BUNDLE PARAMETERS. THE IMPORTANCE OF THE PROPOSED PROCEDURE RESIDES IN ADDRESSING CASES FOR WHICH EMPIRICAL EXPRESSIONS ARE INAPPLICABLE OR DATA TABLE ARE UNAVAILABLE. INITIALLY, THE SHELL POSITIONS IN WHICH TUBES CAN BE PLACED ARE DETERMINED BASED ON A SPECIFIED TUBE PITCH, ANGLE OF THE ARRANGEMENT, INLET AND OUTLET NOZZLE DIAMETERS AND TUBE BUNDLE-TO-SHELL CLEARANCE. THE MAXIMUM NUMBER OF TUBES FOR A GIVEN CONFIGURATION IS OBTAINED FROM THE PREVIOUSLY DESCRIBED SEARCHING PROCEDURE. A SORTING ALGORITHM, BASED ON THE TUBE DISTANCE TO THE SHELL CENTER, IS USED TO APPROPRIATELY PLACE A SPECIFIED NUMBER OF TUBES WITHIN THE HEAT EXCHANGER CROSS SECTION. RESULTS FOR SINGLE-PASS FIXED-TUBESHEET HEAT EXCHANGERS ARE PRESENTED AND COMPARED WITH TUBE COUNT TABLES AVAILABLE IN THE LITERATURE. KEYWORDS: HEAT EXCHANGERS, INDUSTRIAL EQUIPMENTS, MECHANICAL DESIGN, PRESSURE VESSELS

Author :

Leiroz, Albino José Kalab
Medeiros, Michel Souza

Paper View :