Abstract
The exergy, entropy, and entransy analysis for a dual-loop organic Rankine cycle (DORC) using a mixture of working fluids have been investigated in this study. A high-temperature (HT) loop was used to recover waste heat from internal combustion engine in 350 °C, and a low-temperature loop (LT) was used to absorb residual heat of engine exhaust gas and HT loop working fluids. Hexane/toluene, cyclopentane/toluene, and R123/toluene were selected as working fluid mixtures for HT loop, while R245fa/pentane was chosen for LT loop. Results indicated that the variation of entropy generation rate, entransy loss, entransy efficiency, and exergy loss are insensitive to the working fluids. The entransy loss rate and system net power output present the same variation trends, whereas a reverse trend for entropy generation rate and entransy efficiency, while the exergy analysis proved to be only utilized under fixed stream conditions. The results also showed that hexane/toluene is the preferred mixture fluid for DORC.
Highlights
With the depletion of coal, oil, and other non-renewable energy and the increasingly serious environmental problems, the effective use of energy has received great attention
The experiments showed that the regenerative ORC (RORC) efficiency could reach 7.98% and had an improvement of
Results indicated that two-staged ORC (TSORC)-AR could generate more power, while its thermal efficiency was low
Summary
With the depletion of coal, oil, and other non-renewable energy and the increasingly serious environmental problems, the effective use of energy has received great attention. Yuan et al [11] proposed a new deep super-cooling TSORC using R245fa and MM as working fluids They found that the new TSORC could perform better than the basic ORC for high temperature waste heat recovery. Shu et al [13] proposed the DORC system that used the fluids in low-temperature side to absorb residual heat of high-temperature fluid, waste gas and coolant They obtained the maximum output power of 36.77 kW and exergy efficiency of. Et al [24] analyzed the entransy and entropy dissipation of basic ORC They found that the optimal the researches using mixture working fluids for DORC were not well studied. Afterwards, the low-temperature vapor is cooled conducted a detailed parametric analysis of DORC using mixture working fluids, including the entropy,in shared heat exchanger and flows into the pump for cycle. Lecompte et al [30] made exergy analysis and found that using R245fa/pentane could maximize the power output under low temperature environment
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