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Thermal design method of bayonet-tube evaporators and condensers.

Author(s) : KAYANSAYAN N.

Type of article: Article, IJR article

Summary

The paper describes an effectiveness-number of heat transfer units design method of bayonet-tube evaporators and condensers. Including the effect of the wall superheat on the shell-side film coefficient, and using an energy balance on the tube, differential equations for the steady-state fluid temperatures are formulated. Because of the nonlinear nature of the governing equations, the fourth-order Runge-Kutta method is employed to the solution of the finite difference equations. The results are iterated with the combination of integration techniques. An upper bound to the numerical error being more or less 5%, the fluid temperature distribution as well as the exchanger effectiveness are determined, and presented as a function of the Hurd number, the number of heat transfer units and the flow arrangement. For flow entering through the inner tube, the temperature distribution displays the occurrence of a minimum at a point other than the tube-tip of the exchanger. In an extension of the analysis, an effort is made to illustrate the deviation of the results obtained by uniform film coefficient from the study, and the differences are outlined.

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Pages: 197-207

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Details

  • Original title: Thermal design method of bayonet-tube evaporators and condensers.
  • Record ID : 1997-0772
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 19 - n. 3
  • Publication date: 1996/03

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