Application of exergy method to a two-stage irreversible combined refrigeration system

Abstract

The exergy method, based on the maximum exergetic efficiency criterion, is applied to a two-stage irreversible combined refrigeration system. The exergetic efficiency defined as the ratio of rate of exergy output to rate of exergy input is taken as the objective index to be maximized. The related cycle temperature parameters are first solved. The maximum exergetic efficiency is then obtained analytically. Comparisons between the exergetic efficiency and the coefficient of performance of the combined refrigeration system are performed. The influences of various parameters on the system performances are discussed. It shows that the exergy method is practical and effective when operating or designing the combined refrigeration system.

Keywords

exergy optimization irreversible combined refrigeration

Get full access to this article

View all access options for this article.

References

Chen

Yan

Optimal performance of an endoreversible-combined refrigeration cycle. J. Appl. Phys., 1988, 63, 4795–4798.

Chen

Sun

Chen

Optimization of the specific rate of refrigeration in combined refrigeration cycles. Energy, 1995, 20, 1049–1053.

Chen

Optimization of a two-stage combined refrigeration system. Energy Convers. Manage., 1996, 37, 353–358.

Chen

Sun

Steady flow combined refrigeration cycle performance with heat leak. Appl. Therm. Eng., 1997, 17, 639–645.

Chen

Performance characteristics of a two-stage irreversible combined refrigeration system at maximum coefficient of performance. Energy Convers. Manage., 1999, 40, 1939–1948.

Chen

The general performance characteristics of an n-stage combined refrigeration system affected by multiirreversibilities. J. Phys. D: Appl. Phys., 1999, 32, 1462–1468.

Chen

Ecological optimization of a multi-stage irreversible combined refrigeration system. Energy Convers. Manage., 2002, 43, 2379–2393.

Sahin

Kodal

Thermoeconomic optimization of a two stage combined refrigeration system: A finite-time approach. Int. J. Refrig., 2002, 25, 872–877.

Chen

C. K.

Y. F.

Exergetic efficiency optimization for an irreversible Brayton refrigeration cycle. Int. J. Thermal Sci., 2005, 44, 303–310.

10.

Chen

C. K.

Y. F.

Application of exergy method to an irreversible inter-cooled refrigeration cycle. Proc. IMechE, Part A: J. Power and Energy, 2005, 219(A8), 661–667.

11.

Bejan

Theory of heat transfer-irreversible refrigeration plants. Int. J. Heat Mass Transf., 1989, 32, 1631–1639.

12.

Ibrahim

O. M.

Klein

S. A.

Mitchell

J. W.

Optimum power cycles for specified boundary conditions. Trans. ASME, J. Eng. Gas Turbines Power, 1991, 113, 514–521.

13.

Chen

The maximum power output and maximum efficiency of an irreversible Carnot heat engine. J. Phys. D: Appl. Phys., 1994, 27, 1144–1149.