Ecological optimisation of chemical engines with irreversible mass transfer and mass leakage

A new cyclic model of a four-reservoir chemical pump with irreversible mass transfer, mass leakage, and internal dissipation is proposed in this paper. The optimal relation between the coefficient of performance (COP) and the rate of energy pumping of the generalized irreversible four-reservoir chemical pump is derived by using finite-time thermodynamics or thermodynamic optimization. The maximum COP and the corresponding rate of energy pumping, as well as the optimal time parameters of the four mass transfer processes and the optimal chemical potentials of the working fluid are also obtained. Moreover, the influences of these irreversibilities on the optimal performance of the chemical pump are revealed. It is found that the mass leakage affects the optimal performance qualitatively, and the characteristic curve changes from a monotonic decreasing function without mass leakage to a parabolic-like one with mass leakage; while the internal dissipation affects the optimal performance quantitatively, it does not change the shape of the characteristic curve but only decreases the peak value. The results obtained herein can provide some new theoretical guidelines for the optimal design and development of a class of chemical pumps.

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Performance of a four-reservoir chemical potential transformer with irreversible mass transfer and mass leakage

Applied Thermal Engineering ◽

10.1016/j.applthermaleng.2006.09.024 ◽

2007 ◽

Vol 27 (8-9) ◽

pp. 1534-1542 ◽

Cited By ~ 5

Author(s):

Dan Xia ◽

Lingen Chen ◽

Fengrui Sun

Keyword(s):

Mass Transfer ◽

Chemical Potential ◽

Mass Leakage

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Performance optimization for a generalized irreversible four-mass-reservoir diffusion transformer

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1243/09544062jmes856 ◽

2008 ◽

Vol 222 (4) ◽

pp. 689-701 ◽

Cited By ~ 1

Author(s):

D Xia ◽

L Chen ◽

F Sun

Keyword(s):

Mass Transfer ◽

Performance Optimization ◽

Maximum Rate ◽

Optimal Performance ◽

Coefficient Of Performance ◽

Finite Time Thermodynamics ◽

Energy Pumping ◽

Cyclic Model ◽

Internal Dissipation ◽

Mass Leakage

A new cyclic model of a four-mass-reservoir diffusion transformer with irreversible mass transfer, mass leakage, and internal dissipation is established in this paper. The optimal relation between the coefficient of performance (COP) and the rate of energy pumping of the generalized irreversible four-mass-reservoir diffusion transformer is derived by using finite-time thermodynamics. The maximum COP and the corresponding rate of energy pumping, as well as the maximum rate of energy pumping and the corresponding COP, are also obtained. Moreover, the influences of these irreversibilities on the optimal performance of the four-mass-reservoir diffusion transformer are revealed. It is found that the mass leakage affects the optimal performance both qualitatively and quantitatively, whereas the internal dissipation affects the optimal performance quantitatively. The results obtained herein can provide some new theoretical guidance for the optimal design and development of a class of four-mass-reservoir diffusion transformers.

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