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A comparison of Miller and Otto cycle natural gas engines for small scale CHP applications

Authors
Journal
Applied Energy
0306-2619
Publisher
Elsevier
Publication Date
Volume
86
Issue
6
Identifiers
DOI: 10.1016/j.apenergy.2008.09.021
Keywords
  • Miller Cycle
  • Natural Gas Engine
  • Chp
  • Cfd
Disciplines
  • Design

Abstract

Abstract This paper presents an investigation into the feasibility and potential advantages of a small scale Miller cycle natural gas engine for applications such as domestic combined heat and power systems. The Miller cycle engine is compared to a standard Otto cycle engine using cycle analyses and multidimensional simulation, and basic engine design implications are discussed. It is found that the Miller cycle engine has a potential for improved fuel efficiency, but at the cost of a reduced power to weight ratio. A fuel efficiency advantage of 5 → 10 % compared to a standard Otto cycle engine appears possible, however it is stated that further investigations, in particular into the topic of engine friction, are required in order to validate the findings.

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