IRREVERSIBILITIES ASSOCIATED WITH A ROTARY REGENERATOR AND THE EFFICIENCY OF A STEAM POWER-PLANT

被引：5

作者：

SKIEPKO, T ^{[1
]}

机构：

[1] BIALYSTOK TECH UNIV,DEPT HT ENGN,PL-15351 BIALYSTOK,POLAND

来源：

HEAT RECOVERY SYSTEMS & CHP | 1990年 / 10卷 / 03期

关键词：

Steam Power Plants - Efficiency - Thermodynamics - Entropy;

D O I：

10.1016/0890-4332(90)90002-2

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

In the present study a number of expressions determining the irreversible entropy generation in a rotary regenerator are presented. Adding to them formulae: (i) concerning the efficiency of a steam power plant, (ii) describing heat transfer and the pressure losses in a rotary heat exchanger, a computational model has been obtained in order to show how these irreversibilities and the efficiency of a steam power plant depend on the design parameters of a rotary regenerator. Here it was useful to assume an air cycle i-s for flue gas in a steam boiler. The numerical results are presented mainly in graph form making it possible to show the results obtained clearly and to easily draw some conclusions. By first, varying the values of the rotary regenerator matrix height, distribution factor of regenerator flow area on the hot and cold sides, total leakage factor, distribution factor of total leakage on the hot and cold ends and density of gas mass rates flowing through each side of the regenerator, the dependence of the entropy generation rates on the above parameter values is demonstrated. The direct effects of changes in values of the above parameters on a normalized energy measure or irreversibilities and the efficiency of a steam power plant are then evaluated. Having these results presented in juxtaposition, some general and practical conclusions are formulated. © 1990.

引用

页码：187 / 211

页数：25

共 13 条

[1]

Bejan, The concept of irreversibility in heat exchanger design: counterflow heat exchangers for gas-to-gas applications, J. Heat Transfer, 99, pp. 374-380, (1977)

[2]

London, Economics and the second law: an engineering view and methodology, Int. J. Heat Mass Transfer, 25, 6, pp. 743-751, (1982)

[3]

London, Shah, Costs of irreversibilities in heat exchanger design, Heat Transfer Engng, 4, 2, pp. 59-73, (1983)

[4]

Shah, Compact heat exchangers, Handbook of Heat Transfer Applications, pp. 4.174-4.312, (1985)

[5]

Tsujikawa, Sawada, Morimoto, Murata, Thermodynamic optimization method of regenerator of gas turbine with entropy generation, Heat Recovery Systems, 6, 3, pp. 245-253, (1986)

[6]

Zubair, Kadaba, Evans, Second-law-based thermoeconomic optimization of two-phase heat exchangers, J. Heat Transfer, 109, 2, pp. 287-294, (1987)

[7]

Herbein, Rohsenhow, Comparison of entropy generation and conventional method of optimizing a gas turbine regenerator, Int. J. Heat Mass Transfer, 31, 2, pp. 241-244, (1988)

[8]

Grazzini, Gori, Entropy parameters for heat exchanger design, Int. J. Heat Mass Transfer, 31, 12, pp. 2547-2554, (1988)

[9]

Witte, The influence of availability costs on optimal heat exchanger design, J. Heat Transfer, 110, 4 A, pp. 830-835, (1988)

[10]

Vukalovich, Novikov, Engineering Thermodynamics (in Russian), (1968)

← 1 2 →