Open AccessANALYSIS OF A COMBINED BRAYTON/RANKINE CYCLE WITH TWO REGENERATORS IN PARALLEL
Author(s) -
Juliano Theis dos Santos,
T. M. Fagundes,
Eunice E. Santos,
Liércio André Isoldi,
Luíz Alberto Oliveira Rocha
Publication year - 2017
Publication title -
engenharia térmica
Language(s) - English
Resource type - Journals
ISSN - 1676-1790
DOI - 10.5380/reterm.v16i2.62205
Subject(s) - brayton cycle , degree rankine , rankine cycle , regenerative heat exchanger , turbine , working fluid , thermal efficiency , nuclear engineering , organic rankine cycle , thermodynamics , environmental science , isentropic process , thermodynamic cycle , power (physics) , process engineering , electricity generation , engineering , chemistry , heat exchanger , physics , combustion , organic chemistry
This work presents a configuration of two regenerators in parallel for a power generation Brayton/Rankine cycle where the output power is 10 MW. The working fluids considered for the Brayton and Rankine cycles are air and water, respectively. The addition of a regenerator with the previous existing cycle of this kind resulted in the addition of a second-stage turbine in the Rankine cycle of reheat. The objective of this modification is to increase the thermal efficiency of the combined cycle. In order to examine the efficiency of the new configuration, it is performed a thermodynamic modelling and numerical simulations for both cases: a regular Brayton/Rankine cycle and the one with the proposed changes. At the end of the simulations, the two cycles are compared, and it is seen that the new configuration reaches a 0.9% higher efficiency. In addition, the vapor quality at the exit of the higher turbine is higher, reducing the required mass flow rate in 14%.