RT info:eu-repo/semantics/article
T1 Investigation of the impact of the thermodynamic property method on the performance, preliminary component sizing and maximum efficiency configuration of the NET power cycle
A1 Velázquez Palencia, Iván
A1 Demeyer, Frederiek
A1 Reyes Serrano, Miriam
K1 Oxy-combustion
K1 NET power cycle
K1 Supercritical CO2 cycle
K1 Equations of state
K1 CO2-capture
K1 33 Ciencias Tecnológicas
AB This paper investigates the effect of thermodynamic property methods on the NET Power cycle, which is a novelsupercritical CO2 power cycle based on the oxy-combustion technology. A numerical model of the most advancedconfiguration of NET Power cycle and air separation unit was developed in Aspen Plus to characterize thethermodynamic performance, key components presizing, and maximum efficiency operating configuration. ThePeng-Robinson cubic Equation of State (EoS) has traditionally been adopted as the reference EoS (REF EoS) inprevious thermodynamic studies on the NET Power cycle. However, its elevated predictive uncertainty, espe-cially in phase modeling, may have led to inconsistent results. For that reason, and as a novelty, in present work,different EoS such as cubic, viral, SAFT and multiparametric Helmholtz free energy-based methods wereconsidered, to evaluate the effect of the EoS on the cycle components and to optimize the operating conditions ofthe cycle. REFPROP + LKP was also included as the most reliable method. The results reveal that REFPROP +LKP estimates a fluid density in the liquid-like phase pumping stages 25 % higher than the cubic EoSs at nominalconditions. Thus, the compression work is 11.57 % lower and the net cycle efficiency 1.48 % higher. The higherrelative deviations in cycle efficiency were obtained with PC-SAFT and GERG-2008 models. REF EoS estimates arecirculation pump impeller diameter 7.49 % larger than REFPROP + LKP. An oversized pump would operateoutside the design point with low efficiency, flow control difficulties, and potential vibration and overpressureissues. For REFPROP + LKP, the heat exchange area required by the recuperator is 6.46 % lower than thatestimated by REF EoS. This suggests that the manufacturing costs are significantly lower and transient responsefaster than expected. The maximum cycle efficiency resulted in 55.94 %, for a combustor outlet temperature of1103.93 ◦C, turbine inlet and outlet pressures of 273.99 bar and 44.83 bar, and bypass split fraction of 11.37 %
PB Elsevier
SN 1359-4311
YR 2025
FD 2025
LK https://uvadoc.uva.es/handle/10324/76032
UL https://uvadoc.uva.es/handle/10324/76032
LA eng
NO Applied Thermal Engineering, 2025, vol. 273, p. 126491
NO Producción Científica
DS UVaDOC
RD 21-jun-2025