Modelling of a spark ignition engine for power-heat production optimization

Abstract

Spark ignition gas engine are more and more used in order to produce electricity and heat simultaneously. The engine crankshaft drives a synchronous electric generator. The thermal power output is recovered from the engine coolant system and exhausts gas, and is used to produce generally hot water for heating system. In order to have a better adequacy between supply (production of the engine) and demand of user a good knowledge of the engine and phenomena implemented are necessary. A generic methodology is proposed to simulate the stationary state response of a an SI engine. The simulation of engine is based on a one zone thermodynamic model. Which characterizes each phase of the engine cycle to predict energy performances.