TY - JOUR
TI - Thermodynamic analysis of combined power cycle, combining heat from a waste heat source with sub-cycles
AU - Elbir Ahmet
JN - Thermal Science
PY - 2023
VL - 27
IS - 4
SP - 3031
EP - 3041
PT - Article
AB - Significantly increasing consumption and demand in conventional fossil energy  sources require energy sources to be more efficient and sustainable. In this  study, it is aimed to increase the efficiency of the systems by using  thermodynamic cycles from waste heat sources. The designed system is aimed  at increasing the efficiency of the system by adding sub-cycles of the  waste heat of a gas turbine. The results analyzed with the engineering  equation solver program, when all the cycles are combined, the system  energy efficiency is 75% and the total exergy efficiency is 24%. Brayton  cycle when the system is evaluated alone, the energy efficiency of the  system is 65%, the exergy efficiency is 14%. The S-CO2 cycle system when the  system is evaluated alone, the exergy efficiency is 23% and the exergy  efficiency is 11%. The ORC system when the system is evaluated alone, the  exergy efficiency is 19% and the exergy efficiency is 22%. Rankine system  when the system is evaluated alone, the exergy efficiency is 17% and the  exergy efficiency is 88%. Turbine inlet temperatures tend to decrease as the  exergy destruction in the system also affects the subcomponents.