How can the heat transfer correlations for finned-tubes influence the numerical simulation of the dynamic behavior of a heat recovery steam generator?

H. Walter (1) , R. Hofmann

1 Institute for Energy Systems and Thermodynamics

This paper presents the results of a theoretical investigation on the influ- ence of different heat transfer correlations for finned-tubes to the dynamic behavior of a heat recovery steam generator (HRSG). The investigation was done for a vertical type natural circulation HRSG with 3 pressure stages under hot start-up and shutdown conditions. For the calculation of the flue gas side heat transfer coefficient the well known correlations for segmented finned-tubes according to Schmidt, VDI and ESCOATM (traditional and re-vised) as well as a new correlation, which was developed at the Institute for Energy Systems and Thermodynamics, are used. The simulation results show a good agreement in the overall behavior of the boiler between the dif- ferent correlations. But there are still some important differences found in the detail analysis of the boiler behavior.

Mots clés: Heat transfer correlation; heat recovery steam generator; natural circulation; finned tubes; numerical simulation

Domaines: Thermique [physics.class-ph]; Thermique [physics.class-ph]

H. Walter, R. Hofmann. How can the heat transfer correlations for finned-tubes influence the numerical simulation of the dynamic behavior of a heat recovery steam generator?. Applied Thermal Engineering, 2010, 31 (4), pp.405. ⟨10.1016/j.applthermaleng.2010.08.015⟩. ⟨hal-00699058⟩