PERFORMANCE EVALUATION OF LAMINAR FULLY DEVELOPED FLOW THROUGH TRAPEZOIDAL AND HEXAGONAL DUCTS SUBJECTED TO H1 BOUNDARY CONDITION. PART 2

Extended performance evaluation criteria (ExPEC) have been used to assess the performance characteristics of single-phase fully developed laminar flow through bundle of tubes with trapezoidal and hexagonal ducts. The bundle with circular tubes has been used as a reference heat transfer unit. The H1 boundary condition has been selected as thermal boundary condition. The performance characteristics of the heat unit with non-circular tubes have been evaluated and compared to those of the reference unit for different objectives and constraints imposed. As a common constraint, the hydraulic diameter of the non-circular duct has been specified. The results showed that only in the case VG-1 the benefit can be obtained for the values of the irreversibility ratio o 1

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