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Transport Phenomena in Thermal Engineering. Volume 2

ISBN:
1-56700-015-0 (Print)

ANALYTICAL AND NUMERICAL INVESTIGATION OF U-TUBE HEAT EXCHANGERS

E. Lorenzini
Istituto di Fisica Tecnica, Facolta di Ingegneria, Universita di Bologna, viale Risorgimento, 2, Bologna 40136, ITALY

Marco Spiga
Department of Industrial Engineering, University of Parma, 43124 Parma (PR), Italy

Paolo Tartarini
Bio Energy Efficiency Laboratory, Department of Engineering ”Enzo Ferrari”, University of Modena and Reggio Emilia

Gian Luca Morini
Alma Mater Studiorum Universita di Bologna DIN / Scuola di Ingegneria e Architettura, 40136 Bologna, Italy

Abstract

In this paper, a theoretical and numerical study is carried out to describe the thermal behavior of a U-tube heat exchanger. In order to predict the steady temperature distributions of both fluids and wall, some analytical solutions are provided, stressing the effects of the main physical and geometrical parameters on the heat exchanger behavior.
A new model is formulated on the basis of the analytical solutions. A numerical code is also proposed, based on a step-by-step solution of an energy balance equation system. Solutions referred to a reference experimental test are obtained by the analytical and the numerical method. Their comparison shows a satisfactory agreement.