Power extraction from a hot stream in the presence of phase change

The basic thermodynamic optimization problem of extracting the most power from a stream of hot exhaust when the contact heat transfer area is fixed is analyzed. When the receiving (cold) stream boils in the counterflow heat exchanger, the thermodynamic optimization consists of locating the optimal capacity rate of the cold stream. At the optimum, the cold side of the heat transfer surface divides itself into three sections: liquid preheating, boiling and vapor superheating. Numerical results are developed for a range of design parameters of applications with either water or toluene on the cold side. The optimal design is robust because several of the design parameters have only a weak effect on the optimal design.

Duke Authors

Cited Authors

  • Bejan, A; Vargas, JVC; Ordonez, JC

Published Date

  • 1999

Published In

  • International Journal of Heat and Mass Transfer

Volume / Issue

  • 43 / 2

Start / End Page

  • 191 - 201

Citation Source

  • SciVal