Combined effects of variable spectific heats and heat loss on the performance of an Atkinson cycle

Author

Hou, Shuhn-Shyurng ; Chou, Huan-Ming ; Li, Shn-Jhang ; Jheng, Jheng-Hong

Author_Institution

Dept. of Mech. Eng., Kun Shan Univ., Tainan, Taiwan

fYear

2011

fDate

16-18 April 2011

Firstpage

1114

Lastpage

1117

Abstract

The objective of this study is to analyze the effects of heat loss and variable specific heats of working fluid on the performance of an Atkinson engine by using finite-time thermodynamics. The variations in power output and thermal efficiency with compression ratio, and the relations between the power output and the thermal efficiency of the cycle are presented. The results show that the power output as well as the efficiency where maximum power occurs decrease with the increase of heat loss. The thermal efficiency increases with increasing compression ratio. The thermal efficiency is the greatest when the specific heat model proposed by Sonntag et al. is used in the analysis. Both the constant model and the linear model of specific heat underpredict the thermal efficiency of the cycle.

Keywords

heat losses; internal combustion engines; specific heat; thermodynamics; Atkinson cycle engine; compression ratio; constant model; finite time thermodynamics; heat loss; linear model; power output; thermal efficiency; variable specific heat model; working fluid; Combustion; Fluids; Heat engines; Heat transfer; Heating; Thermodynamics; Atkinson cycle; heat loss; specific heat; thermodynamics;

fLanguage

English

Publisher

ieee

Conference_Titel

Consumer Electronics, Communications and Networks (CECNet), 2011 International Conference on

Conference_Location

XianNing

Print_ISBN

978-1-61284-458-9

Type

conf

DOI

10.1109/CECNET.2011.5768998

Filename

5768998