0
RESEARCH PAPERS

The Regenerative Criteria of an Irreversible Brayton Heat Engine and its General Optimum Performance Characteristics

[+] Author and Article Information
Yue Zhang

Department of Physics, Xiamen University, Xiamen 361005, People’s Republic of China

Congjie Ou

Department of Physics, Xiamen University, Xiamen 361005, People’s Republic of China

Bihong Lin

Department of Physics, Xiamen University, Xiamen 361005, People’s Republic of China and Department of Physics, Quanzhou Normal University, Quanzhou 362000, People’s Republic of China

Jincan Chen

Department of Physics, Xiamen University, Xiamen 361005, People’s Republic of Chinajcchen@xmu.edu.cn

J. Energy Resour. Technol 128(3), 216-222 (Oct 22, 2005) (7 pages) doi:10.1115/1.2213272 History: Received June 13, 2005; Revised October 22, 2005

An irreversible cycle model of the Brayton heat engine is established, in which the irreversibilities resulting from the internal dissipation of the working substance in the adiabatic compression and expansion processes and the finite-rate heat transfer in the regenerative and constant-pressure processes are taken into account. The power output and efficiency of the cycle are expressed as functions of temperatures of the working substance and the heat sources, heat transfer coefficients, pressure ratio, regenerator effectiveness, and total heat transfer area including the heat transfer areas of the regenerator and other heat exchangers. The regenerative criteria are given. The power output is optimized for a given efficiency. The general optimal performance characteristics of the cycle are revealed. The optimal performance of the Brayton heat engines with and without regeneration is compared quantitatively. The advantages of using the regenerator are expounded. Some important parameters of an irreversible regenerative Brayton heat engine, such as the temperatures of the working substance at different states, pressure ratio, maximum value of the pressure ratio, regenerator effectiveness and ratios of the various heat transfer areas to the total heat transfer area of the cycle, are further optimized. The optimal relations between these parameters and the efficiency of the cycle are presented by a set of characteristic curves for some assumed compression and expansion efficiencies. The results obtained may be helpful to the comprehensive understanding of the optimal performance of the Brayton heat engines with and without regeneration and play a theoretical instructive role for the optimal design of a regenerative Brayton heat engine.

FIGURES IN THIS ARTICLE
<>
Copyright © 2006 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

(a) The schematic diagram and (b) the T-S diagram of an irreversible regenerative Brayton heat engine

Grahic Jump Location
Figure 2

The P*∼T2∼T4 three-dimensional graph, where P*=P∕αATa, the parameters Ta=300K, Th=1200K, α=β=γ, ηc=ηe=0.94, rp=5, ε=0.7, and cp∕cv=1.4 are chosen

Grahic Jump Location
Figure 3

The P*∼rp∼ε three-dimensional graph, where P*=P∕αATa, the parameters Ta=300K, Th=1200K, α=β=γ, ηc=ηe=0.94, and cp∕cv=1.4 are chosen

Grahic Jump Location
Figure 4

The η∼rp∼ε three-dimensional graph, where the parameters are the same as those used in Fig. 3

Grahic Jump Location
Figure 5

The Pmax*∼η curves, where the parameters are the same as those used in Fig. 3

Grahic Jump Location
Figure 6

The Pmax*∼rp curves, where the parameters are the same as those used in Fig. 3

Grahic Jump Location
Figure 7

The η∼rp curves, where the parameters are the same as those used in Fig. 3

Grahic Jump Location
Figure 8

The optimal curves of some parameters for a regenerative Brayton heat engine, where the parameters Ta=300K, Th=1200K, α=β=γ, and cp∕cv=1.4 are chosen. Curves a, b, and c correspond to the cases of ηc=ηe=1, 0.94, and 0.88, respectively.

Grahic Jump Location
Figure 9

The (rp)r,max∼η curves of a regenerative Brayton heat engine, where the parameters are the same as those used in Fig. 8

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In