arXiv subjects

K. Nilavarasi

Publications and source records attributed to K. Nilavarasi.

3 recordsLinked to original sources

arXiv2023

Efficiency at maximum $\dotΩ$ figure of merit of a spin half quantum heat engine in the presence of external magnetic field

We consider a finite time quantum heat engine analogous to finite time classical Carnot heat engine with a working substance of spin half particles. We study the efficiency at maximum $\dotΩ$ figure of merit of the quantum heat engine of spin half particles as a working substance in the presence of external magnetic field. The efficiency of this engine at maximum $\dotΩ$ figure of merit shows anomalous behavior in certain region of particles population levels. Further, we find that the efficiency at maximum $\dotΩ$ figure exceeds all the known bounds and even approaches the Carnot efficiency at finite time. Our study indicates that the population of spin half particles plays a crucial role in quantum heat engine whose collective effect in the quantum regime can provide superior engine performance with higher efficiency.

quant-ph↗

arXiv2021

Optimized Coefficient of performance of Power law dissipative Carnot like Refrigerator

The present work investigates the generalized extreme bounds of the coefficient of performance (COP) for the power law dissipative Carnot-like refrigerator in the presence of non-adiabatic dissipation under $χ$ and $\dotΩ$ optimization criteria. The lower and upper bounds of the COP for the low dissipation Carnot-like refrigerator under $χ$ and $\dotΩ$ optimization criteria are obtained with power law dissipation level $δ=1$. The comparative analysis of the extreme bounds of COP at optimized $\dot{Ω}$ and $χ$ figure of merit shows the lower bound of the $\dotΩ$ optimized COP is always higher than that of the $χ$ optimized COP, while the upper bound of $\dotΩ$ optimized COP is lesser than the $χ$ optimized COP.

cond-mat.stat-mech↗

arXiv2021

Optimized efficiency at maximum $\dotΩ$ figure of merit and efficient power of Power law dissipative Carnot like heat engines

In the present work, a power law dissipative Carnot like heat engine cycle of two irreversible isothermal and two irreversible adiabatic processes with finite time non-adiabatic dissipation is considered and the efficiency under two optimization criteria $\dotΩ$ figure of merit and efficient power, $χ_{ep}$ is studied. The generalized extreme bounds of the optimized efficiency under the above said optimization criteria are obtained. The lower and upper bounds of the efficiency for the low dissipation Carnot-like heat engine under these optimization criteria are obtained with dissipation level $δ$ = 1. In corroborate with efficiency at maximum power, this result also shows the presence of non-adiabatic dissipation does not influence the extreme bounds on the efficiency optimized by both these target functions in the low dissipation model.

cond-mat.stat-mech↗